5b6d1e4fa4
This commit adds multi-target support to GDB. What this means is that
with this commit, GDB can now be connected to different targets at the
same time. E.g., you can debug a live native process and a core dump
at the same time, connect to multiple gdbservers, etc.
Actually, the word "target" is overloaded in gdb. We already have a
target stack, with pushes several target_ops instances on top of one
another. We also have "info target" already, which means something
completely different to what this patch does.
So from here on, I'll be using the "target connections" term, to mean
an open process_stratum target, pushed on a target stack. This patch
makes gdb have multiple target stacks, and multiple process_stratum
targets open simultaneously. The user-visible changes / commands will
also use this terminology, but of course it's all open to debate.
User-interface-wise, not that much changes. The main difference is
that each inferior may have its own target connection.
A target connection (e.g., a target extended-remote connection) may
support debugging multiple processes, just as before.
Say you're debugging against gdbserver in extended-remote mode, and
you do "add-inferior" to prepare to spawn a new process, like:
(gdb) target extended-remote :9999
...
(gdb) start
...
(gdb) add-inferior
Added inferior 2
(gdb) inferior 2
[Switching to inferior 2 [<null>] (<noexec>)]
(gdb) file a.out
...
(gdb) start
...
At this point, you have two inferiors connected to the same gdbserver.
With this commit, GDB will maintain a target stack per inferior,
instead of a global target stack.
To preserve the behavior above, by default, "add-inferior" makes the
new inferior inherit a copy of the target stack of the current
inferior. Same across a fork - the child inherits a copy of the
target stack of the parent. While the target stacks are copied, the
targets themselves are not. Instead, target_ops is made a
refcounted_object, which means that target_ops instances are
refcounted, which each inferior counting for a reference.
What if you want to create an inferior and connect it to some _other_
target? For that, this commit introduces a new "add-inferior
-no-connection" option that makes the new inferior not share the
current inferior's target. So you could do:
(gdb) target extended-remote :9999
Remote debugging using :9999
...
(gdb) add-inferior -no-connection
[New inferior 2]
Added inferior 2
(gdb) inferior 2
[Switching to inferior 2 [<null>] (<noexec>)]
(gdb) info inferiors
Num Description Executable
1 process 18401 target:/home/pedro/tmp/main
* 2 <null>
(gdb) tar extended-remote :10000
Remote debugging using :10000
...
(gdb) info inferiors
Num Description Executable
1 process 18401 target:/home/pedro/tmp/main
* 2 process 18450 target:/home/pedro/tmp/main
(gdb)
A following patch will extended "info inferiors" to include a column
indicating which connection an inferior is bound to, along with a
couple other UI tweaks.
Other than that, debugging is the same as before. Users interact with
inferiors and threads as before. The only difference is that
inferiors may be bound to processes running in different machines.
That's pretty much all there is to it in terms of noticeable UI
changes.
On to implementation.
Since we can be connected to different systems at the same time, a
ptid_t is no longer a unique identifier. Instead a thread can be
identified by a pair of ptid_t and 'process_stratum_target *', the
later being the instance of the process_stratum target that owns the
process/thread. Note that process_stratum_target inherits from
target_ops, and all process_stratum targets inherit from
process_stratum_target. In earlier patches, many places in gdb were
converted to refer to threads by thread_info pointer instead of
ptid_t, but there are still places in gdb where we start with a
pid/tid and need to find the corresponding inferior or thread_info
objects. So you'll see in the patch many places adding a
process_stratum_target parameter to functions that used to take only a
ptid_t.
Since each inferior has its own target stack now, we can always find
the process_stratum target for an inferior. That is done via a
inf->process_target() convenience method.
Since each inferior has its own target stack, we need to handle the
"beneath" calls when servicing target calls. The solution I settled
with is just to make sure to switch the current inferior to the
inferior you want before making a target call. Not relying on global
context is just not feasible in current GDB. Fortunately, there
aren't that many places that need to do that, because generally most
code that calls target methods already has the current context
pointing to the right inferior/thread. Note, to emphasize -- there's
no method to "switch to this target stack". Instead, you switch the
current inferior, and that implicitly switches the target stack.
In some spots, we need to iterate over all inferiors so that we reach
all target stacks.
Native targets are still singletons. There's always only a single
instance of such targets.
Remote targets however, we'll have one instance per remote connection.
The exec target is still a singleton. There's only one instance. I
did not see the point of instanciating more than one exec_target
object.
After vfork, we need to make sure to push the exec target on the new
inferior. See exec_on_vfork.
For type safety, functions that need a {target, ptid} pair to identify
a thread, take a process_stratum_target pointer for target parameter
instead of target_ops *. Some shared code in gdb/nat/ also need to
gain a target pointer parameter. This poses an issue, since gdbserver
doesn't have process_stratum_target, only target_ops. To fix this,
this commit renames gdbserver's target_ops to process_stratum_target.
I think this makes sense. There's no concept of target stack in
gdbserver, and gdbserver's target_ops really implements a
process_stratum-like target.
The thread and inferior iterator functions also gain
process_stratum_target parameters. These are used to be able to
iterate over threads and inferiors of a given target. Following usual
conventions, if the target pointer is null, then we iterate over
threads and inferiors of all targets.
I tried converting "add-inferior" to the gdb::option framework, as a
preparatory patch, but that stumbled on the fact that gdb::option does
not support file options yet, for "add-inferior -exec". I have a WIP
patchset that adds that, but it's not a trivial patch, mainly due to
need to integrate readline's filename completion, so I deferred that
to some other time.
In infrun.c/infcmd.c, the main change is that we need to poll events
out of all targets. See do_target_wait. Right after collecting an
event, we switch the current inferior to an inferior bound to the
target that reported the event, so that target methods can be used
while handling the event. This makes most of the code transparent to
multi-targets. See fetch_inferior_event.
infrun.c:stop_all_threads is interesting -- in this function we need
to stop all threads of all targets. What the function does is send an
asynchronous stop request to all threads, and then synchronously waits
for events, with target_wait, rinse repeat, until all it finds are
stopped threads. Now that we have multiple targets, it's not
efficient to synchronously block in target_wait waiting for events out
of one target. Instead, we implement a mini event loop, with
interruptible_select, select'ing on one file descriptor per target.
For this to work, we need to be able to ask the target for a waitable
file descriptor. Such file descriptors already exist, they are the
descriptors registered in the main event loop with add_file_handler,
inside the target_async implementations. This commit adds a new
target_async_wait_fd target method that just returns the file
descriptor in question. See wait_one / stop_all_threads in infrun.c.
The 'threads_executing' global is made a per-target variable. Since
it is only relevant to process_stratum_target targets, this is where
it is put, instead of in target_ops.
You'll notice that remote.c includes some FIXME notes. These refer to
the fact that the global arrays that hold data for the remote packets
supported are still globals. For example, if we connect to two
different servers/stubs, then each might support different remote
protocol features. They might even be different architectures, like
e.g., one ARM baremetal stub, and a x86 gdbserver, to debug a
host/controller scenario as a single program. That isn't going to
work correctly today, because of said globals. I'm leaving fixing
that for another pass, since it does not appear to be trivial, and I'd
rather land the base work first. It's already useful to be able to
debug multiple instances of the same server (e.g., a distributed
cluster, where you have full control over the servers installed), so I
think as is it's already reasonable incremental progress.
Current limitations:
- You can only resume more that one target at the same time if all
targets support asynchronous debugging, and support non-stop mode.
It should be possible to support mixed all-stop + non-stop
backends, but that is left for another time. This means that
currently in order to do multi-target with gdbserver you need to
issue "maint set target-non-stop on". I would like to make that
mode be the default, but we're not there yet. Note that I'm
talking about how the target backend works, only. User-visible
all-stop mode works just fine.
- As explained above, connecting to different remote servers at the
same time is likely to produce bad results if they don't support the
exact set of RSP features.
FreeBSD updates courtesy of John Baldwin.
gdb/ChangeLog:
2020-01-10 Pedro Alves <palves@redhat.com>
John Baldwin <jhb@FreeBSD.org>
* aarch64-linux-nat.c
(aarch64_linux_nat_target::thread_architecture): Adjust.
* ada-tasks.c (print_ada_task_info): Adjust find_thread_ptid call.
(task_command_1): Likewise.
* aix-thread.c (sync_threadlists, aix_thread_target::resume)
(aix_thread_target::wait, aix_thread_target::fetch_registers)
(aix_thread_target::store_registers)
(aix_thread_target::thread_alive): Adjust.
* amd64-fbsd-tdep.c: Include "inferior.h".
(amd64fbsd_get_thread_local_address): Pass down target.
* amd64-linux-nat.c (ps_get_thread_area): Use ps_prochandle
thread's gdbarch instead of target_gdbarch.
* break-catch-sig.c (signal_catchpoint_print_it): Adjust call to
get_last_target_status.
* break-catch-syscall.c (print_it_catch_syscall): Likewise.
* breakpoint.c (breakpoints_should_be_inserted_now): Consider all
inferiors.
(update_inserted_breakpoint_locations): Skip if inferiors with no
execution.
(update_global_location_list): When handling moribund locations,
find representative inferior for location's pspace, and use thread
count of its process_stratum target.
* bsd-kvm.c (bsd_kvm_target_open): Pass target down.
* bsd-uthread.c (bsd_uthread_target::wait): Use
as_process_stratum_target and adjust thread_change_ptid and
add_thread calls.
(bsd_uthread_target::update_thread_list): Use
as_process_stratum_target and adjust find_thread_ptid,
thread_change_ptid and add_thread calls.
* btrace.c (maint_btrace_packet_history_cmd): Adjust
find_thread_ptid call.
* corelow.c (add_to_thread_list): Adjust add_thread call.
(core_target_open): Adjust add_thread_silent and thread_count
calls.
(core_target::pid_to_str): Adjust find_inferior_ptid call.
* ctf.c (ctf_target_open): Adjust add_thread_silent call.
* event-top.c (async_disconnect): Pop targets from all inferiors.
* exec.c (add_target_sections): Push exec target on all inferiors
sharing the program space.
(remove_target_sections): Remove the exec target from all
inferiors sharing the program space.
(exec_on_vfork): New.
* exec.h (exec_on_vfork): Declare.
* fbsd-nat.c (fbsd_add_threads): Add fbsd_nat_target parameter.
Pass it down.
(fbsd_nat_target::update_thread_list): Adjust.
(fbsd_nat_target::resume): Adjust.
(fbsd_handle_debug_trap): Add fbsd_nat_target parameter. Pass it
down.
(fbsd_nat_target::wait, fbsd_nat_target::post_attach): Adjust.
* fbsd-tdep.c (fbsd_corefile_thread): Adjust
get_thread_arch_regcache call.
* fork-child.c (gdb_startup_inferior): Pass target down to
startup_inferior and set_executing.
* gdbthread.h (struct process_stratum_target): Forward declare.
(add_thread, add_thread_silent, add_thread_with_info)
(in_thread_list): Add process_stratum_target parameter.
(find_thread_ptid(inferior*, ptid_t)): New overload.
(find_thread_ptid, thread_change_ptid): Add process_stratum_target
parameter.
(all_threads()): Delete overload.
(all_threads, all_non_exited_threads): Add process_stratum_target
parameter.
(all_threads_safe): Use brace initialization.
(thread_count): Add process_stratum_target parameter.
(set_resumed, set_running, set_stop_requested, set_executing)
(threads_are_executing, finish_thread_state): Add
process_stratum_target parameter.
(switch_to_thread): Use is_current_thread.
* i386-fbsd-tdep.c: Include "inferior.h".
(i386fbsd_get_thread_local_address): Pass down target.
* i386-linux-nat.c (i386_linux_nat_target::low_resume): Adjust.
* inf-child.c (inf_child_target::maybe_unpush_target): Remove
have_inferiors check.
* inf-ptrace.c (inf_ptrace_target::create_inferior)
(inf_ptrace_target::attach): Adjust.
* infcall.c (run_inferior_call): Adjust.
* infcmd.c (run_command_1): Pass target to
scoped_finish_thread_state.
(proceed_thread_callback): Skip inferiors with no execution.
(continue_command): Rename 'all_threads' local to avoid hiding
'all_threads' function. Adjust get_last_target_status call.
(prepare_one_step): Adjust set_running call.
(signal_command): Use user_visible_resume_target. Compare thread
pointers instead of inferior_ptid.
(info_program_command): Adjust to pass down target.
(attach_command): Mark target's 'thread_executing' flag.
(stop_current_target_threads_ns): New, factored out from ...
(interrupt_target_1): ... this. Switch inferior before making
target calls.
* inferior-iter.h
(struct all_inferiors_iterator, struct all_inferiors_range)
(struct all_inferiors_safe_range)
(struct all_non_exited_inferiors_range): Filter on
process_stratum_target too. Remove explicit.
* inferior.c (inferior::inferior): Push dummy target on target
stack.
(find_inferior_pid, find_inferior_ptid, number_of_live_inferiors):
Add process_stratum_target parameter, and pass it down.
(have_live_inferiors): Adjust.
(switch_to_inferior_and_push_target): New.
(add_inferior_command, clone_inferior_command): Handle
"-no-connection" parameter. Use
switch_to_inferior_and_push_target.
(_initialize_inferior): Mention "-no-connection" option in
the help of "add-inferior" and "clone-inferior" commands.
* inferior.h: Include "process-stratum-target.h".
(interrupt_target_1): Use bool.
(struct inferior) <push_target, unpush_target, target_is_pushed,
find_target_beneath, top_target, process_target, target_at,
m_stack>: New.
(discard_all_inferiors): Delete.
(find_inferior_pid, find_inferior_ptid, number_of_live_inferiors)
(all_inferiors, all_non_exited_inferiors): Add
process_stratum_target parameter.
* infrun.c: Include "gdb_select.h" and <unordered_map>.
(target_last_proc_target): New global.
(follow_fork_inferior): Push target on new inferior. Pass target
to add_thread_silent. Call exec_on_vfork. Handle target's
reference count.
(follow_fork): Adjust get_last_target_status call. Also consider
target.
(follow_exec): Push target on new inferior.
(struct execution_control_state) <target>: New field.
(user_visible_resume_target): New.
(do_target_resume): Call target_async.
(resume_1): Set target's threads_executing flag. Consider resume
target.
(commit_resume_all_targets): New.
(proceed): Also consider resume target. Skip threads of inferiors
with no execution. Commit resumtion in all targets.
(start_remote): Pass current inferior to wait_for_inferior.
(infrun_thread_stop_requested): Consider target as well. Pass
thread_info pointer to clear_inline_frame_state instead of ptid.
(infrun_thread_thread_exit): Consider target as well.
(random_pending_event_thread): New inferior parameter. Use it.
(do_target_wait): Rename to ...
(do_target_wait_1): ... this. Add inferior parameter, and pass it
down.
(threads_are_resumed_pending_p, do_target_wait): New.
(prepare_for_detach): Adjust calls.
(wait_for_inferior): New inferior parameter. Handle it. Use
do_target_wait_1 instead of do_target_wait.
(fetch_inferior_event): Adjust. Switch to representative
inferior. Pass target down.
(set_last_target_status): Add process_stratum_target parameter.
Save target in global.
(get_last_target_status): Add process_stratum_target parameter and
handle it.
(nullify_last_target_wait_ptid): Clear 'target_last_proc_target'.
(context_switch): Check inferior_ptid == null_ptid before calling
inferior_thread().
(get_inferior_stop_soon): Pass down target.
(wait_one): Rename to ...
(poll_one_curr_target): ... this.
(struct wait_one_event): New.
(wait_one): New.
(stop_all_threads): Adjust.
(handle_no_resumed, handle_inferior_event): Adjust to consider the
event's target.
(switch_back_to_stepped_thread): Also consider target.
(print_stop_event): Update.
(normal_stop): Update. Also consider the resume target.
* infrun.h (wait_for_inferior): Remove declaration.
(user_visible_resume_target): New declaration.
(get_last_target_status, set_last_target_status): New
process_stratum_target parameter.
* inline-frame.c (clear_inline_frame_state(ptid_t)): Add
process_stratum_target parameter, and use it.
(clear_inline_frame_state (thread_info*)): New.
* inline-frame.c (clear_inline_frame_state(ptid_t)): Add
process_stratum_target parameter.
(clear_inline_frame_state (thread_info*)): Declare.
* linux-fork.c (delete_checkpoint_command): Pass target down to
find_thread_ptid.
(checkpoint_command): Adjust.
* linux-nat.c (linux_nat_target::follow_fork): Switch to thread
instead of just tweaking inferior_ptid.
(linux_nat_switch_fork): Pass target down to thread_change_ptid.
(exit_lwp): Pass target down to find_thread_ptid.
(attach_proc_task_lwp_callback): Pass target down to
add_thread/set_running/set_executing.
(linux_nat_target::attach): Pass target down to
thread_change_ptid.
(get_detach_signal): Pass target down to find_thread_ptid.
Consider last target status's target.
(linux_resume_one_lwp_throw, resume_lwp)
(linux_handle_syscall_trap, linux_handle_extended_wait, wait_lwp)
(stop_wait_callback, save_stop_reason, linux_nat_filter_event)
(linux_nat_wait_1, resume_stopped_resumed_lwps): Pass target down.
(linux_nat_target::async_wait_fd): New.
(linux_nat_stop_lwp, linux_nat_target::thread_address_space): Pass
target down.
* linux-nat.h (linux_nat_target::async_wait_fd): Declare.
* linux-tdep.c (get_thread_arch_regcache): Pass target down.
* linux-thread-db.c (struct thread_db_info::process_target): New
field.
(add_thread_db_info): Save target.
(get_thread_db_info): New process_stratum_target parameter. Also
match target.
(delete_thread_db_info): New process_stratum_target parameter.
Also match target.
(thread_from_lwp): Adjust to pass down target.
(thread_db_notice_clone): Pass down target.
(check_thread_db_callback): Pass down target.
(try_thread_db_load_1): Always push the thread_db target.
(try_thread_db_load, record_thread): Pass target down.
(thread_db_target::detach): Pass target down. Always unpush the
thread_db target.
(thread_db_target::wait, thread_db_target::mourn_inferior): Pass
target down. Always unpush the thread_db target.
(find_new_threads_callback, thread_db_find_new_threads_2)
(thread_db_target::update_thread_list): Pass target down.
(thread_db_target::pid_to_str): Pass current inferior down.
(thread_db_target::get_thread_local_address): Pass target down.
(thread_db_target::resume, maintenance_check_libthread_db): Pass
target down.
* nto-procfs.c (nto_procfs_target::update_thread_list): Adjust.
* procfs.c (procfs_target::procfs_init_inferior): Declare.
(proc_set_current_signal, do_attach, procfs_target::wait): Adjust.
(procfs_init_inferior): Rename to ...
(procfs_target::procfs_init_inferior): ... this and adjust.
(procfs_target::create_inferior, procfs_notice_thread)
(procfs_do_thread_registers): Adjust.
* ppc-fbsd-tdep.c: Include "inferior.h".
(ppcfbsd_get_thread_local_address): Pass down target.
* proc-service.c (ps_xfer_memory): Switch current inferior and
program space as well.
(get_ps_regcache): Pass target down.
* process-stratum-target.c
(process_stratum_target::thread_address_space)
(process_stratum_target::thread_architecture): Pass target down.
* process-stratum-target.h
(process_stratum_target::threads_executing): New field.
(as_process_stratum_target): New.
* ravenscar-thread.c
(ravenscar_thread_target::update_inferior_ptid): Pass target down.
(ravenscar_thread_target::wait, ravenscar_add_thread): Pass target
down.
* record-btrace.c (record_btrace_target::info_record): Adjust.
(record_btrace_target::record_method)
(record_btrace_target::record_is_replaying)
(record_btrace_target::fetch_registers)
(get_thread_current_frame_id, record_btrace_target::resume)
(record_btrace_target::wait, record_btrace_target::stop): Pass
target down.
* record-full.c (record_full_wait_1): Switch to event thread.
Pass target down.
* regcache.c (regcache::regcache)
(get_thread_arch_aspace_regcache, get_thread_arch_regcache): Add
process_stratum_target parameter and handle it.
(current_thread_target): New global.
(get_thread_regcache): Add process_stratum_target parameter and
handle it. Switch inferior before calling target method.
(get_thread_regcache): Pass target down.
(get_thread_regcache_for_ptid): Pass target down.
(registers_changed_ptid): Add process_stratum_target parameter and
handle it.
(registers_changed_thread, registers_changed): Pass target down.
(test_get_thread_arch_aspace_regcache): New.
(current_regcache_test): Define a couple local test_target_ops
instances and use them for testing.
(readwrite_regcache): Pass process_stratum_target parameter.
(cooked_read_test, cooked_write_test): Pass mock_target down.
* regcache.h (get_thread_regcache, get_thread_arch_regcache)
(get_thread_arch_aspace_regcache): Add process_stratum_target
parameter.
(regcache::target): New method.
(regcache::regcache, regcache::get_thread_arch_aspace_regcache)
(regcache::registers_changed_ptid): Add process_stratum_target
parameter.
(regcache::m_target): New field.
(registers_changed_ptid): Add process_stratum_target parameter.
* remote.c (remote_state::supports_vCont_probed): New field.
(remote_target::async_wait_fd): New method.
(remote_unpush_and_throw): Add remote_target parameter.
(get_current_remote_target): Adjust.
(remote_target::remote_add_inferior): Push target.
(remote_target::remote_add_thread)
(remote_target::remote_notice_new_inferior)
(get_remote_thread_info): Pass target down.
(remote_target::update_thread_list): Skip threads of inferiors
bound to other targets. (remote_target::close): Don't discard
inferiors. (remote_target::add_current_inferior_and_thread)
(remote_target::process_initial_stop_replies)
(remote_target::start_remote)
(remote_target::remote_serial_quit_handler): Pass down target.
(remote_target::remote_unpush_target): New remote_target
parameter. Unpush the target from all inferiors.
(remote_target::remote_unpush_and_throw): New remote_target
parameter. Pass it down.
(remote_target::open_1): Check whether the current inferior has
execution instead of checking whether any inferior is live. Pass
target down.
(remote_target::remote_detach_1): Pass down target. Use
remote_unpush_target.
(extended_remote_target::attach): Pass down target.
(remote_target::remote_vcont_probe): Set supports_vCont_probed.
(remote_target::append_resumption): Pass down target.
(remote_target::append_pending_thread_resumptions)
(remote_target::remote_resume_with_hc, remote_target::resume)
(remote_target::commit_resume): Pass down target.
(remote_target::remote_stop_ns): Check supports_vCont_probed.
(remote_target::interrupt_query)
(remote_target::remove_new_fork_children)
(remote_target::check_pending_events_prevent_wildcard_vcont)
(remote_target::remote_parse_stop_reply)
(remote_target::process_stop_reply): Pass down target.
(first_remote_resumed_thread): New remote_target parameter. Pass
it down.
(remote_target::wait_as): Pass down target.
(unpush_and_perror): New remote_target parameter. Pass it down.
(remote_target::readchar, remote_target::remote_serial_write)
(remote_target::getpkt_or_notif_sane_1)
(remote_target::kill_new_fork_children, remote_target::kill): Pass
down target.
(remote_target::mourn_inferior): Pass down target. Use
remote_unpush_target.
(remote_target::core_of_thread)
(remote_target::remote_btrace_maybe_reopen): Pass down target.
(remote_target::pid_to_exec_file)
(remote_target::thread_handle_to_thread_info): Pass down target.
(remote_target::async_wait_fd): New.
* riscv-fbsd-tdep.c: Include "inferior.h".
(riscv_fbsd_get_thread_local_address): Pass down target.
* sol2-tdep.c (sol2_core_pid_to_str): Pass down target.
* sol-thread.c (sol_thread_target::wait, ps_lgetregs, ps_lsetregs)
(ps_lgetfpregs, ps_lsetfpregs, sol_update_thread_list_callback):
Adjust.
* solib-spu.c (spu_skip_standalone_loader): Pass down target.
* solib-svr4.c (enable_break): Pass down target.
* spu-multiarch.c (parse_spufs_run): Pass down target.
* spu-tdep.c (spu2ppu_sniffer): Pass down target.
* target-delegates.c: Regenerate.
* target.c (g_target_stack): Delete.
(current_top_target): Return the current inferior's top target.
(target_has_execution_1): Refer to the passed-in inferior's top
target.
(target_supports_terminal_ours): Check whether the initial
inferior was already created.
(decref_target): New.
(target_stack::push): Incref/decref the target.
(push_target, push_target, unpush_target): Adjust.
(target_stack::unpush): Defref target.
(target_is_pushed): Return bool. Adjust to refer to the current
inferior's target stack.
(dispose_inferior): Delete, and inline parts ...
(target_preopen): ... here. Only dispose of the current inferior.
(target_detach): Hold strong target reference while detaching.
Pass target down.
(target_thread_name): Add assertion.
(target_resume): Pass down target.
(target_ops::beneath, find_target_at): Adjust to refer to the
current inferior's target stack.
(get_dummy_target): New.
(target_pass_ctrlc): Pass the Ctrl-C to the first inferior that
has a thread running.
(initialize_targets): Rename to ...
(_initialize_target): ... this.
* target.h: Include "gdbsupport/refcounted-object.h".
(struct target_ops): Inherit refcounted_object.
(target_ops::shortname, target_ops::longname): Make const.
(target_ops::async_wait_fd): New method.
(decref_target): Declare.
(struct target_ops_ref_policy): New.
(target_ops_ref): New typedef.
(get_dummy_target): Declare function.
(target_is_pushed): Return bool.
* thread-iter.c (all_matching_threads_iterator::m_inf_matches)
(all_matching_threads_iterator::all_matching_threads_iterator):
Handle filter target.
* thread-iter.h (struct all_matching_threads_iterator, struct
all_matching_threads_range, class all_non_exited_threads_range):
Filter by target too. Remove explicit.
* thread.c (threads_executing): Delete.
(inferior_thread): Pass down current inferior.
(clear_thread_inferior_resources): Pass down thread pointer
instead of ptid_t.
(add_thread_silent, add_thread_with_info, add_thread): Add
process_stratum_target parameter. Use it for thread and inferior
searches.
(is_current_thread): New.
(thread_info::deletable): Use it.
(find_thread_ptid, thread_count, in_thread_list)
(thread_change_ptid, set_resumed, set_running): New
process_stratum_target parameter. Pass it down.
(set_executing): New process_stratum_target parameter. Pass it
down. Adjust reference to 'threads_executing'.
(threads_are_executing): New process_stratum_target parameter.
Adjust reference to 'threads_executing'.
(set_stop_requested, finish_thread_state): New
process_stratum_target parameter. Pass it down.
(switch_to_thread): Also match inferior.
(switch_to_thread): New process_stratum_target parameter. Pass it
down.
(update_threads_executing): Reimplement.
* top.c (quit_force): Pop targets from all inferior.
(gdb_init): Don't call initialize_targets.
* windows-nat.c (windows_nat_target) <get_windows_debug_event>:
Declare.
(windows_add_thread, windows_delete_thread): Adjust.
(get_windows_debug_event): Rename to ...
(windows_nat_target::get_windows_debug_event): ... this. Adjust.
* tracefile-tfile.c (tfile_target_open): Pass down target.
* gdbsupport/common-gdbthread.h (struct process_stratum_target):
Forward declare.
(switch_to_thread): Add process_stratum_target parameter.
* mi/mi-interp.c (mi_on_resume_1): Add process_stratum_target
parameter. Use it.
(mi_on_resume): Pass target down.
* nat/fork-inferior.c (startup_inferior): Add
process_stratum_target parameter. Pass it down.
* nat/fork-inferior.h (startup_inferior): Add
process_stratum_target parameter.
* python/py-threadevent.c (py_get_event_thread): Pass target down.
gdb/gdbserver/ChangeLog:
2020-01-10 Pedro Alves <palves@redhat.com>
* fork-child.c (post_fork_inferior): Pass target down to
startup_inferior.
* inferiors.c (switch_to_thread): Add process_stratum_target
parameter.
* lynx-low.c (lynx_target_ops): Now a process_stratum_target.
* nto-low.c (nto_target_ops): Now a process_stratum_target.
* linux-low.c (linux_target_ops): Now a process_stratum_target.
* remote-utils.c (prepare_resume_reply): Pass the target to
switch_to_thread.
* target.c (the_target): Now a process_stratum_target.
(done_accessing_memory): Pass the target to switch_to_thread.
(set_target_ops): Ajust to use process_stratum_target.
* target.h (struct target_ops): Rename to ...
(struct process_stratum_target): ... this.
(the_target, set_target_ops): Adjust.
(prepare_to_access_memory): Adjust comment.
* win32-low.c (child_xfer_memory): Adjust to use
process_stratum_target.
(win32_target_ops): Now a process_stratum_target.
3887 lines
110 KiB
C
3887 lines
110 KiB
C
/* Machine independent support for Solaris /proc (process file system) for GDB.
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|
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Copyright (C) 1999-2020 Free Software Foundation, Inc.
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Written by Michael Snyder at Cygnus Solutions.
|
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Based on work by Fred Fish, Stu Grossman, Geoff Noer, and others.
|
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|
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This file is part of GDB.
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|
|
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This program is free software; you can redistribute it and/or modify
|
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it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 3 of the License, or
|
|
(at your option) any later version.
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|
|
This program is distributed in the hope that it will be useful,
|
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but WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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|
GNU General Public License for more details.
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|
You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include "defs.h"
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#include "inferior.h"
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#include "infrun.h"
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#include "target.h"
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#include "gdbcore.h"
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#include "elf-bfd.h" /* for elfcore_write_* */
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#include "gdbcmd.h"
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#include "gdbthread.h"
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#include "regcache.h"
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#include "inf-child.h"
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#include "nat/fork-inferior.h"
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#include "gdbarch.h"
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#define _STRUCTURED_PROC 1 /* Should be done by configure script. */
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#include <sys/procfs.h>
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#include <sys/fault.h>
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#include <sys/syscall.h>
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#include "gdbsupport/gdb_wait.h"
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#include <signal.h>
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#include <ctype.h>
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#include "gdb_bfd.h"
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#include "inflow.h"
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#include "auxv.h"
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#include "procfs.h"
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#include "observable.h"
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#include "gdbsupport/scoped_fd.h"
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#include "gdbsupport/pathstuff.h"
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/* This module provides the interface between GDB and the
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/proc file system, which is used on many versions of Unix
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as a means for debuggers to control other processes.
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/proc works by imitating a file system: you open a simulated file
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that represents the process you wish to interact with, and perform
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operations on that "file" in order to examine or change the state
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of the other process.
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The most important thing to know about /proc and this module is
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that there are two very different interfaces to /proc:
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One that uses the ioctl system call, and another that uses read
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and write system calls.
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This module supports only the Solaris version of the read/write
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interface. */
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#include <sys/types.h>
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#include <dirent.h> /* opendir/readdir, for listing the LWP's */
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#include <fcntl.h> /* for O_RDONLY */
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#include <unistd.h> /* for "X_OK" */
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#include <sys/stat.h> /* for struct stat */
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/* Note: procfs-utils.h must be included after the above system header
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files, because it redefines various system calls using macros.
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This may be incompatible with the prototype declarations. */
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#include "proc-utils.h"
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/* Prototypes for supply_gregset etc. */
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#include "gregset.h"
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/* =================== TARGET_OPS "MODULE" =================== */
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/* This module defines the GDB target vector and its methods. */
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static enum target_xfer_status procfs_xfer_memory (gdb_byte *,
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const gdb_byte *,
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ULONGEST, ULONGEST,
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ULONGEST *);
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class procfs_target final : public inf_child_target
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{
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public:
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void create_inferior (const char *, const std::string &,
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char **, int) override;
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void kill () override;
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void mourn_inferior () override;
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void attach (const char *, int) override;
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void detach (inferior *inf, int) override;
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void resume (ptid_t, int, enum gdb_signal) override;
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ptid_t wait (ptid_t, struct target_waitstatus *, int) override;
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void fetch_registers (struct regcache *, int) override;
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void store_registers (struct regcache *, int) override;
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enum target_xfer_status xfer_partial (enum target_object object,
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const char *annex,
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gdb_byte *readbuf,
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const gdb_byte *writebuf,
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ULONGEST offset, ULONGEST len,
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ULONGEST *xfered_len) override;
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void pass_signals (gdb::array_view<const unsigned char>) override;
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void files_info () override;
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void update_thread_list () override;
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bool thread_alive (ptid_t ptid) override;
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std::string pid_to_str (ptid_t) override;
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char *pid_to_exec_file (int pid) override;
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thread_control_capabilities get_thread_control_capabilities () override
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{ return tc_schedlock; }
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/* find_memory_regions support method for gcore */
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int find_memory_regions (find_memory_region_ftype func, void *data)
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override;
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char *make_corefile_notes (bfd *, int *) override;
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bool info_proc (const char *, enum info_proc_what) override;
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#if PR_MODEL_NATIVE == PR_MODEL_LP64
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int auxv_parse (gdb_byte **readptr,
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gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
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override;
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#endif
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bool stopped_by_watchpoint () override;
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int insert_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
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struct expression *) override;
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int remove_watchpoint (CORE_ADDR, int, enum target_hw_bp_type,
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struct expression *) override;
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int region_ok_for_hw_watchpoint (CORE_ADDR, int) override;
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int can_use_hw_breakpoint (enum bptype, int, int) override;
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bool stopped_data_address (CORE_ADDR *) override;
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void procfs_init_inferior (int pid);
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};
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static procfs_target the_procfs_target;
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#if PR_MODEL_NATIVE == PR_MODEL_LP64
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/* When GDB is built as 64-bit application on Solaris, the auxv data
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is presented in 64-bit format. We need to provide a custom parser
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to handle that. */
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int
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procfs_target::auxv_parse (gdb_byte **readptr,
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gdb_byte *endptr, CORE_ADDR *typep, CORE_ADDR *valp)
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{
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enum bfd_endian byte_order = gdbarch_byte_order (target_gdbarch ());
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gdb_byte *ptr = *readptr;
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if (endptr == ptr)
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return 0;
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if (endptr - ptr < 8 * 2)
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return -1;
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*typep = extract_unsigned_integer (ptr, 4, byte_order);
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ptr += 8;
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/* The size of data is always 64-bit. If the application is 32-bit,
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it will be zero extended, as expected. */
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*valp = extract_unsigned_integer (ptr, 8, byte_order);
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ptr += 8;
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*readptr = ptr;
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return 1;
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}
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#endif
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/* =================== END, TARGET_OPS "MODULE" =================== */
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/* World Unification:
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Put any typedefs, defines etc. here that are required for the
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unification of code that handles different versions of /proc. */
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enum { READ_WATCHFLAG = WA_READ,
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WRITE_WATCHFLAG = WA_WRITE,
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EXEC_WATCHFLAG = WA_EXEC,
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AFTER_WATCHFLAG = WA_TRAPAFTER
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};
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/* =================== STRUCT PROCINFO "MODULE" =================== */
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/* FIXME: this comment will soon be out of date W.R.T. threads. */
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/* The procinfo struct is a wrapper to hold all the state information
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concerning a /proc process. There should be exactly one procinfo
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for each process, and since GDB currently can debug only one
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process at a time, that means there should be only one procinfo.
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All of the LWP's of a process can be accessed indirectly thru the
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single process procinfo.
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However, against the day when GDB may debug more than one process,
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this data structure is kept in a list (which for now will hold no
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more than one member), and many functions will have a pointer to a
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procinfo as an argument.
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There will be a separate procinfo structure for use by the (not yet
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implemented) "info proc" command, so that we can print useful
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information about any random process without interfering with the
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inferior's procinfo information. */
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/* format strings for /proc paths */
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#define MAIN_PROC_NAME_FMT "/proc/%d"
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#define CTL_PROC_NAME_FMT "/proc/%d/ctl"
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#define AS_PROC_NAME_FMT "/proc/%d/as"
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#define MAP_PROC_NAME_FMT "/proc/%d/map"
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#define STATUS_PROC_NAME_FMT "/proc/%d/status"
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#define MAX_PROC_NAME_SIZE sizeof("/proc/999999/lwp/0123456789/lwpstatus")
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typedef struct procinfo {
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struct procinfo *next;
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int pid; /* Process ID */
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int tid; /* Thread/LWP id */
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/* process state */
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int was_stopped;
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int ignore_next_sigstop;
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int ctl_fd; /* File descriptor for /proc control file */
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int status_fd; /* File descriptor for /proc status file */
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int as_fd; /* File descriptor for /proc as file */
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char pathname[MAX_PROC_NAME_SIZE]; /* Pathname to /proc entry */
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fltset_t saved_fltset; /* Saved traced hardware fault set */
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sigset_t saved_sigset; /* Saved traced signal set */
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sigset_t saved_sighold; /* Saved held signal set */
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sysset_t *saved_exitset; /* Saved traced system call exit set */
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sysset_t *saved_entryset; /* Saved traced system call entry set */
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pstatus_t prstatus; /* Current process status info */
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struct procinfo *thread_list;
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int status_valid : 1;
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int gregs_valid : 1;
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int fpregs_valid : 1;
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int threads_valid: 1;
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} procinfo;
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static char errmsg[128]; /* shared error msg buffer */
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/* Function prototypes for procinfo module: */
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static procinfo *find_procinfo_or_die (int pid, int tid);
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static procinfo *find_procinfo (int pid, int tid);
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static procinfo *create_procinfo (int pid, int tid);
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static void destroy_procinfo (procinfo *p);
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static void dead_procinfo (procinfo *p, const char *msg, int killp);
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static int open_procinfo_files (procinfo *p, int which);
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static void close_procinfo_files (procinfo *p);
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|
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static int iterate_over_mappings
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(procinfo *pi, find_memory_region_ftype child_func, void *data,
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int (*func) (struct prmap *map, find_memory_region_ftype child_func,
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|
void *data));
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|
|
/* The head of the procinfo list: */
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static procinfo *procinfo_list;
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|
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/* Search the procinfo list. Return a pointer to procinfo, or NULL if
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not found. */
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|
|
static procinfo *
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find_procinfo (int pid, int tid)
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{
|
|
procinfo *pi;
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|
|
|
for (pi = procinfo_list; pi; pi = pi->next)
|
|
if (pi->pid == pid)
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break;
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|
|
if (pi)
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|
if (tid)
|
|
{
|
|
/* Don't check threads_valid. If we're updating the
|
|
thread_list, we want to find whatever threads are already
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|
here. This means that in general it is the caller's
|
|
responsibility to check threads_valid and update before
|
|
calling find_procinfo, if the caller wants to find a new
|
|
thread. */
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|
|
|
for (pi = pi->thread_list; pi; pi = pi->next)
|
|
if (pi->tid == tid)
|
|
break;
|
|
}
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|
|
|
return pi;
|
|
}
|
|
|
|
/* Calls find_procinfo, but errors on failure. */
|
|
|
|
static procinfo *
|
|
find_procinfo_or_die (int pid, int tid)
|
|
{
|
|
procinfo *pi = find_procinfo (pid, tid);
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|
|
if (pi == NULL)
|
|
{
|
|
if (tid)
|
|
error (_("procfs: couldn't find pid %d "
|
|
"(kernel thread %d) in procinfo list."),
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|
pid, tid);
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|
else
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|
error (_("procfs: couldn't find pid %d in procinfo list."), pid);
|
|
}
|
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return pi;
|
|
}
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|
|
/* Wrapper for `open'. The appropriate open call is attempted; if
|
|
unsuccessful, it will be retried as many times as needed for the
|
|
EAGAIN and EINTR conditions.
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|
|
For other conditions, retry the open a limited number of times. In
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|
addition, a short sleep is imposed prior to retrying the open. The
|
|
reason for this sleep is to give the kernel a chance to catch up
|
|
and create the file in question in the event that GDB "wins" the
|
|
race to open a file before the kernel has created it. */
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|
|
static int
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open_with_retry (const char *pathname, int flags)
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|
{
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|
int retries_remaining, status;
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|
|
retries_remaining = 2;
|
|
|
|
while (1)
|
|
{
|
|
status = open (pathname, flags);
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|
|
if (status >= 0 || retries_remaining == 0)
|
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break;
|
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else if (errno != EINTR && errno != EAGAIN)
|
|
{
|
|
retries_remaining--;
|
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sleep (1);
|
|
}
|
|
}
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|
|
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return status;
|
|
}
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|
|
/* Open the file descriptor for the process or LWP. We only open the
|
|
control file descriptor; the others are opened lazily as needed.
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Returns the file descriptor, or zero for failure. */
|
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|
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enum { FD_CTL, FD_STATUS, FD_AS };
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|
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static int
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open_procinfo_files (procinfo *pi, int which)
|
|
{
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char tmp[MAX_PROC_NAME_SIZE];
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int fd;
|
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|
|
/* This function is getting ALMOST long enough to break up into
|
|
several. Here is some rationale:
|
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|
|
There are several file descriptors that may need to be open
|
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for any given process or LWP. The ones we're interested in are:
|
|
- control (ctl) write-only change the state
|
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- status (status) read-only query the state
|
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- address space (as) read/write access memory
|
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- map (map) read-only virtual addr map
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Most of these are opened lazily as they are needed.
|
|
The pathnames for the 'files' for an LWP look slightly
|
|
different from those of a first-class process:
|
|
Pathnames for a process (<proc-id>):
|
|
/proc/<proc-id>/ctl
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/proc/<proc-id>/status
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/proc/<proc-id>/as
|
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/proc/<proc-id>/map
|
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Pathnames for an LWP (lwp-id):
|
|
/proc/<proc-id>/lwp/<lwp-id>/lwpctl
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/proc/<proc-id>/lwp/<lwp-id>/lwpstatus
|
|
An LWP has no map or address space file descriptor, since
|
|
the memory map and address space are shared by all LWPs. */
|
|
|
|
/* In this case, there are several different file descriptors that
|
|
we might be asked to open. The control file descriptor will be
|
|
opened early, but the others will be opened lazily as they are
|
|
needed. */
|
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|
|
strcpy (tmp, pi->pathname);
|
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switch (which) { /* Which file descriptor to open? */
|
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case FD_CTL:
|
|
if (pi->tid)
|
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strcat (tmp, "/lwpctl");
|
|
else
|
|
strcat (tmp, "/ctl");
|
|
fd = open_with_retry (tmp, O_WRONLY);
|
|
if (fd < 0)
|
|
return 0; /* fail */
|
|
pi->ctl_fd = fd;
|
|
break;
|
|
case FD_AS:
|
|
if (pi->tid)
|
|
return 0; /* There is no 'as' file descriptor for an lwp. */
|
|
strcat (tmp, "/as");
|
|
fd = open_with_retry (tmp, O_RDWR);
|
|
if (fd < 0)
|
|
return 0; /* fail */
|
|
pi->as_fd = fd;
|
|
break;
|
|
case FD_STATUS:
|
|
if (pi->tid)
|
|
strcat (tmp, "/lwpstatus");
|
|
else
|
|
strcat (tmp, "/status");
|
|
fd = open_with_retry (tmp, O_RDONLY);
|
|
if (fd < 0)
|
|
return 0; /* fail */
|
|
pi->status_fd = fd;
|
|
break;
|
|
default:
|
|
return 0; /* unknown file descriptor */
|
|
}
|
|
|
|
return 1; /* success */
|
|
}
|
|
|
|
/* Allocate a data structure and link it into the procinfo list.
|
|
First tries to find a pre-existing one (FIXME: why?). Returns the
|
|
pointer to new procinfo struct. */
|
|
|
|
static procinfo *
|
|
create_procinfo (int pid, int tid)
|
|
{
|
|
procinfo *pi, *parent = NULL;
|
|
|
|
pi = find_procinfo (pid, tid);
|
|
if (pi != NULL)
|
|
return pi; /* Already exists, nothing to do. */
|
|
|
|
/* Find parent before doing malloc, to save having to cleanup. */
|
|
if (tid != 0)
|
|
parent = find_procinfo_or_die (pid, 0); /* FIXME: should I
|
|
create it if it
|
|
doesn't exist yet? */
|
|
|
|
pi = XNEW (procinfo);
|
|
memset (pi, 0, sizeof (procinfo));
|
|
pi->pid = pid;
|
|
pi->tid = tid;
|
|
|
|
pi->saved_entryset = XNEW (sysset_t);
|
|
pi->saved_exitset = XNEW (sysset_t);
|
|
|
|
/* Chain into list. */
|
|
if (tid == 0)
|
|
{
|
|
xsnprintf (pi->pathname, sizeof (pi->pathname), MAIN_PROC_NAME_FMT, pid);
|
|
pi->next = procinfo_list;
|
|
procinfo_list = pi;
|
|
}
|
|
else
|
|
{
|
|
xsnprintf (pi->pathname, sizeof (pi->pathname), "/proc/%d/lwp/%d",
|
|
pid, tid);
|
|
pi->next = parent->thread_list;
|
|
parent->thread_list = pi;
|
|
}
|
|
return pi;
|
|
}
|
|
|
|
/* Close all file descriptors associated with the procinfo. */
|
|
|
|
static void
|
|
close_procinfo_files (procinfo *pi)
|
|
{
|
|
if (pi->ctl_fd > 0)
|
|
close (pi->ctl_fd);
|
|
if (pi->as_fd > 0)
|
|
close (pi->as_fd);
|
|
if (pi->status_fd > 0)
|
|
close (pi->status_fd);
|
|
pi->ctl_fd = pi->as_fd = pi->status_fd = 0;
|
|
}
|
|
|
|
/* Destructor function. Close, unlink and deallocate the object. */
|
|
|
|
static void
|
|
destroy_one_procinfo (procinfo **list, procinfo *pi)
|
|
{
|
|
procinfo *ptr;
|
|
|
|
/* Step one: unlink the procinfo from its list. */
|
|
if (pi == *list)
|
|
*list = pi->next;
|
|
else
|
|
for (ptr = *list; ptr; ptr = ptr->next)
|
|
if (ptr->next == pi)
|
|
{
|
|
ptr->next = pi->next;
|
|
break;
|
|
}
|
|
|
|
/* Step two: close any open file descriptors. */
|
|
close_procinfo_files (pi);
|
|
|
|
/* Step three: free the memory. */
|
|
xfree (pi->saved_entryset);
|
|
xfree (pi->saved_exitset);
|
|
xfree (pi);
|
|
}
|
|
|
|
static void
|
|
destroy_procinfo (procinfo *pi)
|
|
{
|
|
procinfo *tmp;
|
|
|
|
if (pi->tid != 0) /* Destroy a thread procinfo. */
|
|
{
|
|
tmp = find_procinfo (pi->pid, 0); /* Find the parent process. */
|
|
destroy_one_procinfo (&tmp->thread_list, pi);
|
|
}
|
|
else /* Destroy a process procinfo and all its threads. */
|
|
{
|
|
/* First destroy the children, if any; */
|
|
while (pi->thread_list != NULL)
|
|
destroy_one_procinfo (&pi->thread_list, pi->thread_list);
|
|
/* Then destroy the parent. Genocide!!! */
|
|
destroy_one_procinfo (&procinfo_list, pi);
|
|
}
|
|
}
|
|
|
|
/* A deleter that calls destroy_procinfo. */
|
|
struct procinfo_deleter
|
|
{
|
|
void operator() (procinfo *pi) const
|
|
{
|
|
destroy_procinfo (pi);
|
|
}
|
|
};
|
|
|
|
typedef std::unique_ptr<procinfo, procinfo_deleter> procinfo_up;
|
|
|
|
enum { NOKILL, KILL };
|
|
|
|
/* To be called on a non_recoverable error for a procinfo. Prints
|
|
error messages, optionally sends a SIGKILL to the process, then
|
|
destroys the data structure. */
|
|
|
|
static void
|
|
dead_procinfo (procinfo *pi, const char *msg, int kill_p)
|
|
{
|
|
char procfile[80];
|
|
|
|
if (pi->pathname)
|
|
print_sys_errmsg (pi->pathname, errno);
|
|
else
|
|
{
|
|
xsnprintf (procfile, sizeof (procfile), "process %d", pi->pid);
|
|
print_sys_errmsg (procfile, errno);
|
|
}
|
|
if (kill_p == KILL)
|
|
kill (pi->pid, SIGKILL);
|
|
|
|
destroy_procinfo (pi);
|
|
error ("%s", msg);
|
|
}
|
|
|
|
/* =================== END, STRUCT PROCINFO "MODULE" =================== */
|
|
|
|
/* =================== /proc "MODULE" =================== */
|
|
|
|
/* This "module" is the interface layer between the /proc system API
|
|
and the gdb target vector functions. This layer consists of access
|
|
functions that encapsulate each of the basic operations that we
|
|
need to use from the /proc API.
|
|
|
|
The main motivation for this layer is to hide the fact that there
|
|
are two very different implementations of the /proc API. Rather
|
|
than have a bunch of #ifdefs all thru the gdb target vector
|
|
functions, we do our best to hide them all in here. */
|
|
|
|
static long proc_flags (procinfo *pi);
|
|
static int proc_why (procinfo *pi);
|
|
static int proc_what (procinfo *pi);
|
|
static int proc_set_current_signal (procinfo *pi, int signo);
|
|
static int proc_get_current_thread (procinfo *pi);
|
|
static int proc_iterate_over_threads
|
|
(procinfo *pi,
|
|
int (*func) (procinfo *, procinfo *, void *),
|
|
void *ptr);
|
|
|
|
static void
|
|
proc_warn (procinfo *pi, const char *func, int line)
|
|
{
|
|
xsnprintf (errmsg, sizeof (errmsg), "procfs: %s line %d, %s",
|
|
func, line, pi->pathname);
|
|
print_sys_errmsg (errmsg, errno);
|
|
}
|
|
|
|
static void
|
|
proc_error (procinfo *pi, const char *func, int line)
|
|
{
|
|
xsnprintf (errmsg, sizeof (errmsg), "procfs: %s line %d, %s",
|
|
func, line, pi->pathname);
|
|
perror_with_name (errmsg);
|
|
}
|
|
|
|
/* Updates the status struct in the procinfo. There is a 'valid'
|
|
flag, to let other functions know when this function needs to be
|
|
called (so the status is only read when it is needed). The status
|
|
file descriptor is also only opened when it is needed. Returns
|
|
non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_get_status (procinfo *pi)
|
|
{
|
|
/* Status file descriptor is opened "lazily". */
|
|
if (pi->status_fd == 0 && open_procinfo_files (pi, FD_STATUS) == 0)
|
|
{
|
|
pi->status_valid = 0;
|
|
return 0;
|
|
}
|
|
|
|
if (lseek (pi->status_fd, 0, SEEK_SET) < 0)
|
|
pi->status_valid = 0; /* fail */
|
|
else
|
|
{
|
|
/* Sigh... I have to read a different data structure,
|
|
depending on whether this is a main process or an LWP. */
|
|
if (pi->tid)
|
|
pi->status_valid = (read (pi->status_fd,
|
|
(char *) &pi->prstatus.pr_lwp,
|
|
sizeof (lwpstatus_t))
|
|
== sizeof (lwpstatus_t));
|
|
else
|
|
{
|
|
pi->status_valid = (read (pi->status_fd,
|
|
(char *) &pi->prstatus,
|
|
sizeof (pstatus_t))
|
|
== sizeof (pstatus_t));
|
|
}
|
|
}
|
|
|
|
if (pi->status_valid)
|
|
{
|
|
PROC_PRETTYFPRINT_STATUS (proc_flags (pi),
|
|
proc_why (pi),
|
|
proc_what (pi),
|
|
proc_get_current_thread (pi));
|
|
}
|
|
|
|
/* The status struct includes general regs, so mark them valid too. */
|
|
pi->gregs_valid = pi->status_valid;
|
|
/* In the read/write multiple-fd model, the status struct includes
|
|
the fp regs too, so mark them valid too. */
|
|
pi->fpregs_valid = pi->status_valid;
|
|
return pi->status_valid; /* True if success, false if failure. */
|
|
}
|
|
|
|
/* Returns the process flags (pr_flags field). */
|
|
|
|
static long
|
|
proc_flags (procinfo *pi)
|
|
{
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return 0; /* FIXME: not a good failure value (but what is?) */
|
|
|
|
return pi->prstatus.pr_lwp.pr_flags;
|
|
}
|
|
|
|
/* Returns the pr_why field (why the process stopped). */
|
|
|
|
static int
|
|
proc_why (procinfo *pi)
|
|
{
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return 0; /* FIXME: not a good failure value (but what is?) */
|
|
|
|
return pi->prstatus.pr_lwp.pr_why;
|
|
}
|
|
|
|
/* Returns the pr_what field (details of why the process stopped). */
|
|
|
|
static int
|
|
proc_what (procinfo *pi)
|
|
{
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return 0; /* FIXME: not a good failure value (but what is?) */
|
|
|
|
return pi->prstatus.pr_lwp.pr_what;
|
|
}
|
|
|
|
/* This function is only called when PI is stopped by a watchpoint.
|
|
Assuming the OS supports it, write to *ADDR the data address which
|
|
triggered it and return 1. Return 0 if it is not possible to know
|
|
the address. */
|
|
|
|
static int
|
|
proc_watchpoint_address (procinfo *pi, CORE_ADDR *addr)
|
|
{
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return 0;
|
|
|
|
*addr = (CORE_ADDR) gdbarch_pointer_to_address (target_gdbarch (),
|
|
builtin_type (target_gdbarch ())->builtin_data_ptr,
|
|
(gdb_byte *) &pi->prstatus.pr_lwp.pr_info.si_addr);
|
|
return 1;
|
|
}
|
|
|
|
/* Returns the pr_nsysarg field (number of args to the current
|
|
syscall). */
|
|
|
|
static int
|
|
proc_nsysarg (procinfo *pi)
|
|
{
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return 0;
|
|
|
|
return pi->prstatus.pr_lwp.pr_nsysarg;
|
|
}
|
|
|
|
/* Returns the pr_sysarg field (pointer to the arguments of current
|
|
syscall). */
|
|
|
|
static long *
|
|
proc_sysargs (procinfo *pi)
|
|
{
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return NULL;
|
|
|
|
return (long *) &pi->prstatus.pr_lwp.pr_sysarg;
|
|
}
|
|
|
|
/* Set or reset any of the following process flags:
|
|
PR_FORK -- forked child will inherit trace flags
|
|
PR_RLC -- traced process runs when last /proc file closed.
|
|
PR_KLC -- traced process is killed when last /proc file closed.
|
|
PR_ASYNC -- LWP's get to run/stop independently.
|
|
|
|
This function is done using read/write [PCSET/PCRESET/PCUNSET].
|
|
|
|
Arguments:
|
|
pi -- the procinfo
|
|
flag -- one of PR_FORK, PR_RLC, or PR_ASYNC
|
|
mode -- 1 for set, 0 for reset.
|
|
|
|
Returns non-zero for success, zero for failure. */
|
|
|
|
enum { FLAG_RESET, FLAG_SET };
|
|
|
|
static int
|
|
proc_modify_flag (procinfo *pi, long flag, long mode)
|
|
{
|
|
long win = 0; /* default to fail */
|
|
|
|
/* These operations affect the process as a whole, and applying them
|
|
to an individual LWP has the same meaning as applying them to the
|
|
main process. Therefore, if we're ever called with a pointer to
|
|
an LWP's procinfo, let's substitute the process's procinfo and
|
|
avoid opening the LWP's file descriptor unnecessarily. */
|
|
|
|
if (pi->pid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
procfs_ctl_t arg[2];
|
|
|
|
if (mode == FLAG_SET) /* Set the flag (RLC, FORK, or ASYNC). */
|
|
arg[0] = PCSET;
|
|
else /* Reset the flag. */
|
|
arg[0] = PCUNSET;
|
|
|
|
arg[1] = flag;
|
|
win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
|
|
|
|
/* The above operation renders the procinfo's cached pstatus
|
|
obsolete. */
|
|
pi->status_valid = 0;
|
|
|
|
if (!win)
|
|
warning (_("procfs: modify_flag failed to turn %s %s"),
|
|
flag == PR_FORK ? "PR_FORK" :
|
|
flag == PR_RLC ? "PR_RLC" :
|
|
flag == PR_ASYNC ? "PR_ASYNC" :
|
|
flag == PR_KLC ? "PR_KLC" :
|
|
"<unknown flag>",
|
|
mode == FLAG_RESET ? "off" : "on");
|
|
|
|
return win;
|
|
}
|
|
|
|
/* Set the run_on_last_close flag. Process with all threads will
|
|
become runnable when debugger closes all /proc fds. Returns
|
|
non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_set_run_on_last_close (procinfo *pi)
|
|
{
|
|
return proc_modify_flag (pi, PR_RLC, FLAG_SET);
|
|
}
|
|
|
|
/* Reset the run_on_last_close flag. The process will NOT become
|
|
runnable when debugger closes its file handles. Returns non-zero
|
|
for success, zero for failure. */
|
|
|
|
static int
|
|
proc_unset_run_on_last_close (procinfo *pi)
|
|
{
|
|
return proc_modify_flag (pi, PR_RLC, FLAG_RESET);
|
|
}
|
|
|
|
/* Reset inherit_on_fork flag. If the process forks a child while we
|
|
are registered for events in the parent, then we will NOT receive
|
|
events from the child. Returns non-zero for success, zero for
|
|
failure. */
|
|
|
|
static int
|
|
proc_unset_inherit_on_fork (procinfo *pi)
|
|
{
|
|
return proc_modify_flag (pi, PR_FORK, FLAG_RESET);
|
|
}
|
|
|
|
/* Set PR_ASYNC flag. If one LWP stops because of a debug event
|
|
(signal etc.), the remaining LWPs will continue to run. Returns
|
|
non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_set_async (procinfo *pi)
|
|
{
|
|
return proc_modify_flag (pi, PR_ASYNC, FLAG_SET);
|
|
}
|
|
|
|
/* Reset PR_ASYNC flag. If one LWP stops because of a debug event
|
|
(signal etc.), then all other LWPs will stop as well. Returns
|
|
non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_unset_async (procinfo *pi)
|
|
{
|
|
return proc_modify_flag (pi, PR_ASYNC, FLAG_RESET);
|
|
}
|
|
|
|
/* Request the process/LWP to stop. Does not wait. Returns non-zero
|
|
for success, zero for failure. */
|
|
|
|
static int
|
|
proc_stop_process (procinfo *pi)
|
|
{
|
|
int win;
|
|
|
|
/* We might conceivably apply this operation to an LWP, and the
|
|
LWP's ctl file descriptor might not be open. */
|
|
|
|
if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0)
|
|
return 0;
|
|
else
|
|
{
|
|
procfs_ctl_t cmd = PCSTOP;
|
|
|
|
win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));
|
|
}
|
|
|
|
return win;
|
|
}
|
|
|
|
/* Wait for the process or LWP to stop (block until it does). Returns
|
|
non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_wait_for_stop (procinfo *pi)
|
|
{
|
|
int win;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
procfs_ctl_t cmd = PCWSTOP;
|
|
|
|
set_sigint_trap ();
|
|
|
|
win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));
|
|
|
|
clear_sigint_trap ();
|
|
|
|
/* We been runnin' and we stopped -- need to update status. */
|
|
pi->status_valid = 0;
|
|
|
|
return win;
|
|
}
|
|
|
|
/* Make the process or LWP runnable.
|
|
|
|
Options (not all are implemented):
|
|
- single-step
|
|
- clear current fault
|
|
- clear current signal
|
|
- abort the current system call
|
|
- stop as soon as finished with system call
|
|
- (ioctl): set traced signal set
|
|
- (ioctl): set held signal set
|
|
- (ioctl): set traced fault set
|
|
- (ioctl): set start pc (vaddr)
|
|
|
|
Always clears the current fault. PI is the process or LWP to
|
|
operate on. If STEP is true, set the process or LWP to trap after
|
|
one instruction. If SIGNO is zero, clear the current signal if
|
|
any; if non-zero, set the current signal to this one. Returns
|
|
non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_run_process (procinfo *pi, int step, int signo)
|
|
{
|
|
int win;
|
|
int runflags;
|
|
|
|
/* We will probably have to apply this operation to individual
|
|
threads, so make sure the control file descriptor is open. */
|
|
|
|
if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0)
|
|
return 0;
|
|
|
|
runflags = PRCFAULT; /* Always clear current fault. */
|
|
if (step)
|
|
runflags |= PRSTEP;
|
|
if (signo == 0)
|
|
runflags |= PRCSIG;
|
|
else if (signo != -1) /* -1 means do nothing W.R.T. signals. */
|
|
proc_set_current_signal (pi, signo);
|
|
|
|
procfs_ctl_t cmd[2];
|
|
|
|
cmd[0] = PCRUN;
|
|
cmd[1] = runflags;
|
|
win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));
|
|
|
|
return win;
|
|
}
|
|
|
|
/* Register to trace signals in the process or LWP. Returns non-zero
|
|
for success, zero for failure. */
|
|
|
|
static int
|
|
proc_set_traced_signals (procinfo *pi, sigset_t *sigset)
|
|
{
|
|
int win;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
struct {
|
|
procfs_ctl_t cmd;
|
|
/* Use char array to avoid alignment issues. */
|
|
char sigset[sizeof (sigset_t)];
|
|
} arg;
|
|
|
|
arg.cmd = PCSTRACE;
|
|
memcpy (&arg.sigset, sigset, sizeof (sigset_t));
|
|
|
|
win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg));
|
|
|
|
/* The above operation renders the procinfo's cached pstatus obsolete. */
|
|
pi->status_valid = 0;
|
|
|
|
if (!win)
|
|
warning (_("procfs: set_traced_signals failed"));
|
|
return win;
|
|
}
|
|
|
|
/* Register to trace hardware faults in the process or LWP. Returns
|
|
non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_set_traced_faults (procinfo *pi, fltset_t *fltset)
|
|
{
|
|
int win;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
struct {
|
|
procfs_ctl_t cmd;
|
|
/* Use char array to avoid alignment issues. */
|
|
char fltset[sizeof (fltset_t)];
|
|
} arg;
|
|
|
|
arg.cmd = PCSFAULT;
|
|
memcpy (&arg.fltset, fltset, sizeof (fltset_t));
|
|
|
|
win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg));
|
|
|
|
/* The above operation renders the procinfo's cached pstatus obsolete. */
|
|
pi->status_valid = 0;
|
|
|
|
return win;
|
|
}
|
|
|
|
/* Register to trace entry to system calls in the process or LWP.
|
|
Returns non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_set_traced_sysentry (procinfo *pi, sysset_t *sysset)
|
|
{
|
|
int win;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
struct {
|
|
procfs_ctl_t cmd;
|
|
/* Use char array to avoid alignment issues. */
|
|
char sysset[sizeof (sysset_t)];
|
|
} arg;
|
|
|
|
arg.cmd = PCSENTRY;
|
|
memcpy (&arg.sysset, sysset, sizeof (sysset_t));
|
|
|
|
win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg));
|
|
|
|
/* The above operation renders the procinfo's cached pstatus
|
|
obsolete. */
|
|
pi->status_valid = 0;
|
|
|
|
return win;
|
|
}
|
|
|
|
/* Register to trace exit from system calls in the process or LWP.
|
|
Returns non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_set_traced_sysexit (procinfo *pi, sysset_t *sysset)
|
|
{
|
|
int win;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
struct gdb_proc_ctl_pcsexit {
|
|
procfs_ctl_t cmd;
|
|
/* Use char array to avoid alignment issues. */
|
|
char sysset[sizeof (sysset_t)];
|
|
} arg;
|
|
|
|
arg.cmd = PCSEXIT;
|
|
memcpy (&arg.sysset, sysset, sizeof (sysset_t));
|
|
|
|
win = (write (pi->ctl_fd, (char *) &arg, sizeof (arg)) == sizeof (arg));
|
|
|
|
/* The above operation renders the procinfo's cached pstatus
|
|
obsolete. */
|
|
pi->status_valid = 0;
|
|
|
|
return win;
|
|
}
|
|
|
|
/* Specify the set of blocked / held signals in the process or LWP.
|
|
Returns non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_set_held_signals (procinfo *pi, sigset_t *sighold)
|
|
{
|
|
int win;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
struct {
|
|
procfs_ctl_t cmd;
|
|
/* Use char array to avoid alignment issues. */
|
|
char hold[sizeof (sigset_t)];
|
|
} arg;
|
|
|
|
arg.cmd = PCSHOLD;
|
|
memcpy (&arg.hold, sighold, sizeof (sigset_t));
|
|
win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
|
|
|
|
/* The above operation renders the procinfo's cached pstatus
|
|
obsolete. */
|
|
pi->status_valid = 0;
|
|
|
|
return win;
|
|
}
|
|
|
|
/* Returns the set of signals that are held / blocked. Will also copy
|
|
the sigset if SAVE is non-zero. */
|
|
|
|
static sigset_t *
|
|
proc_get_held_signals (procinfo *pi, sigset_t *save)
|
|
{
|
|
sigset_t *ret = NULL;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return NULL;
|
|
|
|
ret = &pi->prstatus.pr_lwp.pr_lwphold;
|
|
if (save && ret)
|
|
memcpy (save, ret, sizeof (sigset_t));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Returns the set of signals that are traced / debugged. Will also
|
|
copy the sigset if SAVE is non-zero. */
|
|
|
|
static sigset_t *
|
|
proc_get_traced_signals (procinfo *pi, sigset_t *save)
|
|
{
|
|
sigset_t *ret = NULL;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return NULL;
|
|
|
|
ret = &pi->prstatus.pr_sigtrace;
|
|
if (save && ret)
|
|
memcpy (save, ret, sizeof (sigset_t));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Returns the set of hardware faults that are traced /debugged. Will
|
|
also copy the faultset if SAVE is non-zero. */
|
|
|
|
static fltset_t *
|
|
proc_get_traced_faults (procinfo *pi, fltset_t *save)
|
|
{
|
|
fltset_t *ret = NULL;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return NULL;
|
|
|
|
ret = &pi->prstatus.pr_flttrace;
|
|
if (save && ret)
|
|
memcpy (save, ret, sizeof (fltset_t));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Returns the set of syscalls that are traced /debugged on entry.
|
|
Will also copy the syscall set if SAVE is non-zero. */
|
|
|
|
static sysset_t *
|
|
proc_get_traced_sysentry (procinfo *pi, sysset_t *save)
|
|
{
|
|
sysset_t *ret = NULL;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return NULL;
|
|
|
|
ret = &pi->prstatus.pr_sysentry;
|
|
if (save && ret)
|
|
memcpy (save, ret, sizeof (sysset_t));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Returns the set of syscalls that are traced /debugged on exit.
|
|
Will also copy the syscall set if SAVE is non-zero. */
|
|
|
|
static sysset_t *
|
|
proc_get_traced_sysexit (procinfo *pi, sysset_t *save)
|
|
{
|
|
sysset_t *ret = NULL;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return NULL;
|
|
|
|
ret = &pi->prstatus.pr_sysexit;
|
|
if (save && ret)
|
|
memcpy (save, ret, sizeof (sysset_t));
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* The current fault (if any) is cleared; the associated signal will
|
|
not be sent to the process or LWP when it resumes. Returns
|
|
non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_clear_current_fault (procinfo *pi)
|
|
{
|
|
int win;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
procfs_ctl_t cmd = PCCFAULT;
|
|
|
|
win = (write (pi->ctl_fd, (void *) &cmd, sizeof (cmd)) == sizeof (cmd));
|
|
|
|
return win;
|
|
}
|
|
|
|
/* Set the "current signal" that will be delivered next to the
|
|
process. NOTE: semantics are different from those of KILL. This
|
|
signal will be delivered to the process or LWP immediately when it
|
|
is resumed (even if the signal is held/blocked); it will NOT
|
|
immediately cause another event of interest, and will NOT first
|
|
trap back to the debugger. Returns non-zero for success, zero for
|
|
failure. */
|
|
|
|
static int
|
|
proc_set_current_signal (procinfo *pi, int signo)
|
|
{
|
|
int win;
|
|
struct {
|
|
procfs_ctl_t cmd;
|
|
/* Use char array to avoid alignment issues. */
|
|
char sinfo[sizeof (siginfo_t)];
|
|
} arg;
|
|
siginfo_t mysinfo;
|
|
process_stratum_target *wait_target;
|
|
ptid_t wait_ptid;
|
|
struct target_waitstatus wait_status;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
/* The pointer is just a type alias. */
|
|
get_last_target_status (&wait_target, &wait_ptid, &wait_status);
|
|
if (wait_target == &the_procfs_target
|
|
&& wait_ptid == inferior_ptid
|
|
&& wait_status.kind == TARGET_WAITKIND_STOPPED
|
|
&& wait_status.value.sig == gdb_signal_from_host (signo)
|
|
&& proc_get_status (pi)
|
|
&& pi->prstatus.pr_lwp.pr_info.si_signo == signo
|
|
)
|
|
/* Use the siginfo associated with the signal being
|
|
redelivered. */
|
|
memcpy (arg.sinfo, &pi->prstatus.pr_lwp.pr_info, sizeof (siginfo_t));
|
|
else
|
|
{
|
|
mysinfo.si_signo = signo;
|
|
mysinfo.si_code = 0;
|
|
mysinfo.si_pid = getpid (); /* ?why? */
|
|
mysinfo.si_uid = getuid (); /* ?why? */
|
|
memcpy (arg.sinfo, &mysinfo, sizeof (siginfo_t));
|
|
}
|
|
|
|
arg.cmd = PCSSIG;
|
|
win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
|
|
|
|
return win;
|
|
}
|
|
|
|
/* The current signal (if any) is cleared, and is not sent to the
|
|
process or LWP when it resumes. Returns non-zero for success, zero
|
|
for failure. */
|
|
|
|
static int
|
|
proc_clear_current_signal (procinfo *pi)
|
|
{
|
|
int win;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
struct {
|
|
procfs_ctl_t cmd;
|
|
/* Use char array to avoid alignment issues. */
|
|
char sinfo[sizeof (siginfo_t)];
|
|
} arg;
|
|
siginfo_t mysinfo;
|
|
|
|
arg.cmd = PCSSIG;
|
|
/* The pointer is just a type alias. */
|
|
mysinfo.si_signo = 0;
|
|
mysinfo.si_code = 0;
|
|
mysinfo.si_errno = 0;
|
|
mysinfo.si_pid = getpid (); /* ?why? */
|
|
mysinfo.si_uid = getuid (); /* ?why? */
|
|
memcpy (arg.sinfo, &mysinfo, sizeof (siginfo_t));
|
|
|
|
win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
|
|
|
|
return win;
|
|
}
|
|
|
|
/* Return the general-purpose registers for the process or LWP
|
|
corresponding to PI. Upon failure, return NULL. */
|
|
|
|
static gdb_gregset_t *
|
|
proc_get_gregs (procinfo *pi)
|
|
{
|
|
if (!pi->status_valid || !pi->gregs_valid)
|
|
if (!proc_get_status (pi))
|
|
return NULL;
|
|
|
|
return &pi->prstatus.pr_lwp.pr_reg;
|
|
}
|
|
|
|
/* Return the general-purpose registers for the process or LWP
|
|
corresponding to PI. Upon failure, return NULL. */
|
|
|
|
static gdb_fpregset_t *
|
|
proc_get_fpregs (procinfo *pi)
|
|
{
|
|
if (!pi->status_valid || !pi->fpregs_valid)
|
|
if (!proc_get_status (pi))
|
|
return NULL;
|
|
|
|
return &pi->prstatus.pr_lwp.pr_fpreg;
|
|
}
|
|
|
|
/* Write the general-purpose registers back to the process or LWP
|
|
corresponding to PI. Return non-zero for success, zero for
|
|
failure. */
|
|
|
|
static int
|
|
proc_set_gregs (procinfo *pi)
|
|
{
|
|
gdb_gregset_t *gregs;
|
|
int win;
|
|
|
|
gregs = proc_get_gregs (pi);
|
|
if (gregs == NULL)
|
|
return 0; /* proc_get_regs has already warned. */
|
|
|
|
if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0)
|
|
return 0;
|
|
else
|
|
{
|
|
struct {
|
|
procfs_ctl_t cmd;
|
|
/* Use char array to avoid alignment issues. */
|
|
char gregs[sizeof (gdb_gregset_t)];
|
|
} arg;
|
|
|
|
arg.cmd = PCSREG;
|
|
memcpy (&arg.gregs, gregs, sizeof (arg.gregs));
|
|
win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
|
|
}
|
|
|
|
/* Policy: writing the registers invalidates our cache. */
|
|
pi->gregs_valid = 0;
|
|
return win;
|
|
}
|
|
|
|
/* Write the floating-pointer registers back to the process or LWP
|
|
corresponding to PI. Return non-zero for success, zero for
|
|
failure. */
|
|
|
|
static int
|
|
proc_set_fpregs (procinfo *pi)
|
|
{
|
|
gdb_fpregset_t *fpregs;
|
|
int win;
|
|
|
|
fpregs = proc_get_fpregs (pi);
|
|
if (fpregs == NULL)
|
|
return 0; /* proc_get_fpregs has already warned. */
|
|
|
|
if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0)
|
|
return 0;
|
|
else
|
|
{
|
|
struct {
|
|
procfs_ctl_t cmd;
|
|
/* Use char array to avoid alignment issues. */
|
|
char fpregs[sizeof (gdb_fpregset_t)];
|
|
} arg;
|
|
|
|
arg.cmd = PCSFPREG;
|
|
memcpy (&arg.fpregs, fpregs, sizeof (arg.fpregs));
|
|
win = (write (pi->ctl_fd, (void *) &arg, sizeof (arg)) == sizeof (arg));
|
|
}
|
|
|
|
/* Policy: writing the registers invalidates our cache. */
|
|
pi->fpregs_valid = 0;
|
|
return win;
|
|
}
|
|
|
|
/* Send a signal to the proc or lwp with the semantics of "kill()".
|
|
Returns non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_kill (procinfo *pi, int signo)
|
|
{
|
|
int win;
|
|
|
|
/* We might conceivably apply this operation to an LWP, and the
|
|
LWP's ctl file descriptor might not be open. */
|
|
|
|
if (pi->ctl_fd == 0 && open_procinfo_files (pi, FD_CTL) == 0)
|
|
return 0;
|
|
else
|
|
{
|
|
procfs_ctl_t cmd[2];
|
|
|
|
cmd[0] = PCKILL;
|
|
cmd[1] = signo;
|
|
win = (write (pi->ctl_fd, (char *) &cmd, sizeof (cmd)) == sizeof (cmd));
|
|
}
|
|
|
|
return win;
|
|
}
|
|
|
|
/* Find the pid of the process that started this one. Returns the
|
|
parent process pid, or zero. */
|
|
|
|
static int
|
|
proc_parent_pid (procinfo *pi)
|
|
{
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return 0;
|
|
|
|
return pi->prstatus.pr_ppid;
|
|
}
|
|
|
|
/* Convert a target address (a.k.a. CORE_ADDR) into a host address
|
|
(a.k.a void pointer)! */
|
|
|
|
static void *
|
|
procfs_address_to_host_pointer (CORE_ADDR addr)
|
|
{
|
|
struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
|
|
void *ptr;
|
|
|
|
gdb_assert (sizeof (ptr) == TYPE_LENGTH (ptr_type));
|
|
gdbarch_address_to_pointer (target_gdbarch (), ptr_type,
|
|
(gdb_byte *) &ptr, addr);
|
|
return ptr;
|
|
}
|
|
|
|
static int
|
|
proc_set_watchpoint (procinfo *pi, CORE_ADDR addr, int len, int wflags)
|
|
{
|
|
struct {
|
|
procfs_ctl_t cmd;
|
|
char watch[sizeof (prwatch_t)];
|
|
} arg;
|
|
prwatch_t pwatch;
|
|
|
|
/* NOTE: cagney/2003-02-01: Even more horrible hack. Need to
|
|
convert a target address into something that can be stored in a
|
|
native data structure. */
|
|
pwatch.pr_vaddr = (uintptr_t) procfs_address_to_host_pointer (addr);
|
|
pwatch.pr_size = len;
|
|
pwatch.pr_wflags = wflags;
|
|
arg.cmd = PCWATCH;
|
|
memcpy (arg.watch, &pwatch, sizeof (prwatch_t));
|
|
return (write (pi->ctl_fd, &arg, sizeof (arg)) == sizeof (arg));
|
|
}
|
|
|
|
#if (defined(__i386__) || defined(__x86_64__)) && defined (sun)
|
|
|
|
#include <sys/sysi86.h>
|
|
|
|
/* The KEY is actually the value of the lower 16 bits of the GS
|
|
register for the LWP that we're interested in. Returns the
|
|
matching ssh struct (LDT entry). */
|
|
|
|
static struct ssd *
|
|
proc_get_LDT_entry (procinfo *pi, int key) /* ARI: editCase function */
|
|
{
|
|
static struct ssd *ldt_entry = NULL;
|
|
char pathname[MAX_PROC_NAME_SIZE];
|
|
|
|
/* Allocate space for one LDT entry.
|
|
This alloc must persist, because we return a pointer to it. */
|
|
if (ldt_entry == NULL)
|
|
ldt_entry = XNEW (struct ssd);
|
|
|
|
/* Open the file descriptor for the LDT table. */
|
|
xsnprintf (pathname, sizeof (pathname), "/proc/%d/ldt", pi->pid);
|
|
scoped_fd fd (open_with_retry (pathname, O_RDONLY));
|
|
if (fd.get () < 0)
|
|
{
|
|
proc_warn (pi, "proc_get_LDT_entry (open)", __LINE__);
|
|
return NULL;
|
|
}
|
|
|
|
/* Now 'read' thru the table, find a match and return it. */
|
|
while (read (fd.get (), ldt_entry, sizeof (struct ssd))
|
|
== sizeof (struct ssd))
|
|
{
|
|
if (ldt_entry->sel == 0
|
|
&& ldt_entry->bo == 0
|
|
&& ldt_entry->acc1 == 0
|
|
&& ldt_entry->acc2 == 0)
|
|
break; /* end of table */
|
|
/* If key matches, return this entry. */
|
|
if (ldt_entry->sel == key)
|
|
return ldt_entry;
|
|
}
|
|
/* Loop ended, match not found. */
|
|
return NULL;
|
|
}
|
|
|
|
/* Returns the pointer to the LDT entry of PTID. */
|
|
|
|
struct ssd *
|
|
procfs_find_LDT_entry (ptid_t ptid) /* ARI: editCase function */
|
|
{
|
|
gdb_gregset_t *gregs;
|
|
int key;
|
|
procinfo *pi;
|
|
|
|
/* Find procinfo for the lwp. */
|
|
pi = find_procinfo (ptid.pid (), ptid.lwp ());
|
|
if (pi == NULL)
|
|
{
|
|
warning (_("procfs_find_LDT_entry: could not find procinfo for %d:%ld."),
|
|
ptid.pid (), ptid.lwp ());
|
|
return NULL;
|
|
}
|
|
/* get its general registers. */
|
|
gregs = proc_get_gregs (pi);
|
|
if (gregs == NULL)
|
|
{
|
|
warning (_("procfs_find_LDT_entry: could not read gregs for %d:%ld."),
|
|
ptid.pid (), ptid.lwp ());
|
|
return NULL;
|
|
}
|
|
/* Now extract the GS register's lower 16 bits. */
|
|
key = (*gregs)[GS] & 0xffff;
|
|
|
|
/* Find the matching entry and return it. */
|
|
return proc_get_LDT_entry (pi, key);
|
|
}
|
|
|
|
#endif
|
|
|
|
/* =============== END, non-thread part of /proc "MODULE" =============== */
|
|
|
|
/* =================== Thread "MODULE" =================== */
|
|
|
|
/* NOTE: you'll see more ifdefs and duplication of functions here,
|
|
since there is a different way to do threads on every OS. */
|
|
|
|
/* Returns the number of threads for the process. */
|
|
|
|
static int
|
|
proc_get_nthreads (procinfo *pi)
|
|
{
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return 0;
|
|
|
|
/* Only works for the process procinfo, because the LWP procinfos do not
|
|
get prstatus filled in. */
|
|
if (pi->tid != 0) /* Find the parent process procinfo. */
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
return pi->prstatus.pr_nlwp;
|
|
}
|
|
|
|
/* LWP version.
|
|
|
|
Return the ID of the thread that had an event of interest.
|
|
(ie. the one that hit a breakpoint or other traced event). All
|
|
other things being equal, this should be the ID of a thread that is
|
|
currently executing. */
|
|
|
|
static int
|
|
proc_get_current_thread (procinfo *pi)
|
|
{
|
|
/* Note: this should be applied to the root procinfo for the
|
|
process, not to the procinfo for an LWP. If applied to the
|
|
procinfo for an LWP, it will simply return that LWP's ID. In
|
|
that case, find the parent process procinfo. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
if (!pi->status_valid)
|
|
if (!proc_get_status (pi))
|
|
return 0;
|
|
|
|
return pi->prstatus.pr_lwp.pr_lwpid;
|
|
}
|
|
|
|
/* Discover the IDs of all the threads within the process, and create
|
|
a procinfo for each of them (chained to the parent). This
|
|
unfortunately requires a different method on every OS. Returns
|
|
non-zero for success, zero for failure. */
|
|
|
|
static int
|
|
proc_delete_dead_threads (procinfo *parent, procinfo *thread, void *ignore)
|
|
{
|
|
if (thread && parent) /* sanity */
|
|
{
|
|
thread->status_valid = 0;
|
|
if (!proc_get_status (thread))
|
|
destroy_one_procinfo (&parent->thread_list, thread);
|
|
}
|
|
return 0; /* keep iterating */
|
|
}
|
|
|
|
static int
|
|
proc_update_threads (procinfo *pi)
|
|
{
|
|
char pathname[MAX_PROC_NAME_SIZE + 16];
|
|
struct dirent *direntry;
|
|
procinfo *thread;
|
|
gdb_dir_up dirp;
|
|
int lwpid;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
proc_iterate_over_threads (pi, proc_delete_dead_threads, NULL);
|
|
|
|
/* Note: this brute-force method was originally devised for Unixware
|
|
(support removed since), and will also work on Solaris 2.6 and
|
|
2.7. The original comment mentioned the existence of a much
|
|
simpler and more elegant way to do this on Solaris, but didn't
|
|
point out what that was. */
|
|
|
|
strcpy (pathname, pi->pathname);
|
|
strcat (pathname, "/lwp");
|
|
dirp.reset (opendir (pathname));
|
|
if (dirp == NULL)
|
|
proc_error (pi, "update_threads, opendir", __LINE__);
|
|
|
|
while ((direntry = readdir (dirp.get ())) != NULL)
|
|
if (direntry->d_name[0] != '.') /* skip '.' and '..' */
|
|
{
|
|
lwpid = atoi (&direntry->d_name[0]);
|
|
thread = create_procinfo (pi->pid, lwpid);
|
|
if (thread == NULL)
|
|
proc_error (pi, "update_threads, create_procinfo", __LINE__);
|
|
}
|
|
pi->threads_valid = 1;
|
|
return 1;
|
|
}
|
|
|
|
/* Given a pointer to a function, call that function once for each lwp
|
|
in the procinfo list, until the function returns non-zero, in which
|
|
event return the value returned by the function.
|
|
|
|
Note: this function does NOT call update_threads. If you want to
|
|
discover new threads first, you must call that function explicitly.
|
|
This function just makes a quick pass over the currently-known
|
|
procinfos.
|
|
|
|
PI is the parent process procinfo. FUNC is the per-thread
|
|
function. PTR is an opaque parameter for function. Returns the
|
|
first non-zero return value from the callee, or zero. */
|
|
|
|
static int
|
|
proc_iterate_over_threads (procinfo *pi,
|
|
int (*func) (procinfo *, procinfo *, void *),
|
|
void *ptr)
|
|
{
|
|
procinfo *thread, *next;
|
|
int retval = 0;
|
|
|
|
/* We should never have to apply this operation to any procinfo
|
|
except the one for the main process. If that ever changes for
|
|
any reason, then take out the following clause and replace it
|
|
with one that makes sure the ctl_fd is open. */
|
|
|
|
if (pi->tid != 0)
|
|
pi = find_procinfo_or_die (pi->pid, 0);
|
|
|
|
for (thread = pi->thread_list; thread != NULL; thread = next)
|
|
{
|
|
next = thread->next; /* In case thread is destroyed. */
|
|
retval = (*func) (pi, thread, ptr);
|
|
if (retval != 0)
|
|
break;
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* =================== END, Thread "MODULE" =================== */
|
|
|
|
/* =================== END, /proc "MODULE" =================== */
|
|
|
|
/* =================== GDB "MODULE" =================== */
|
|
|
|
/* Here are all of the gdb target vector functions and their
|
|
friends. */
|
|
|
|
static ptid_t do_attach (ptid_t ptid);
|
|
static void do_detach ();
|
|
static void proc_trace_syscalls_1 (procinfo *pi, int syscallnum,
|
|
int entry_or_exit, int mode, int from_tty);
|
|
|
|
/* Sets up the inferior to be debugged. Registers to trace signals,
|
|
hardware faults, and syscalls. Note: does not set RLC flag: caller
|
|
may want to customize that. Returns zero for success (note!
|
|
unlike most functions in this module); on failure, returns the LINE
|
|
NUMBER where it failed! */
|
|
|
|
static int
|
|
procfs_debug_inferior (procinfo *pi)
|
|
{
|
|
fltset_t traced_faults;
|
|
sigset_t traced_signals;
|
|
sysset_t *traced_syscall_entries;
|
|
sysset_t *traced_syscall_exits;
|
|
int status;
|
|
|
|
/* Register to trace hardware faults in the child. */
|
|
prfillset (&traced_faults); /* trace all faults... */
|
|
prdelset (&traced_faults, FLTPAGE); /* except page fault. */
|
|
if (!proc_set_traced_faults (pi, &traced_faults))
|
|
return __LINE__;
|
|
|
|
/* Initially, register to trace all signals in the child. */
|
|
prfillset (&traced_signals);
|
|
if (!proc_set_traced_signals (pi, &traced_signals))
|
|
return __LINE__;
|
|
|
|
|
|
/* Register to trace the 'exit' system call (on entry). */
|
|
traced_syscall_entries = XNEW (sysset_t);
|
|
premptyset (traced_syscall_entries);
|
|
praddset (traced_syscall_entries, SYS_exit);
|
|
praddset (traced_syscall_entries, SYS_lwp_exit);
|
|
|
|
status = proc_set_traced_sysentry (pi, traced_syscall_entries);
|
|
xfree (traced_syscall_entries);
|
|
if (!status)
|
|
return __LINE__;
|
|
|
|
/* Method for tracing exec syscalls. */
|
|
/* GW: Rationale...
|
|
Not all systems with /proc have all the exec* syscalls with the same
|
|
names. On the SGI, for example, there is no SYS_exec, but there
|
|
*is* a SYS_execv. So, we try to account for that. */
|
|
|
|
traced_syscall_exits = XNEW (sysset_t);
|
|
premptyset (traced_syscall_exits);
|
|
#ifdef SYS_exec
|
|
praddset (traced_syscall_exits, SYS_exec);
|
|
#endif
|
|
praddset (traced_syscall_exits, SYS_execve);
|
|
praddset (traced_syscall_exits, SYS_lwp_create);
|
|
praddset (traced_syscall_exits, SYS_lwp_exit);
|
|
|
|
status = proc_set_traced_sysexit (pi, traced_syscall_exits);
|
|
xfree (traced_syscall_exits);
|
|
if (!status)
|
|
return __LINE__;
|
|
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
procfs_target::attach (const char *args, int from_tty)
|
|
{
|
|
int pid;
|
|
|
|
pid = parse_pid_to_attach (args);
|
|
|
|
if (pid == getpid ())
|
|
error (_("Attaching GDB to itself is not a good idea..."));
|
|
|
|
if (from_tty)
|
|
{
|
|
const char *exec_file = get_exec_file (0);
|
|
|
|
if (exec_file)
|
|
printf_filtered (_("Attaching to program `%s', %s\n"),
|
|
exec_file, target_pid_to_str (ptid_t (pid)).c_str ());
|
|
else
|
|
printf_filtered (_("Attaching to %s\n"),
|
|
target_pid_to_str (ptid_t (pid)).c_str ());
|
|
|
|
fflush (stdout);
|
|
}
|
|
inferior_ptid = do_attach (ptid_t (pid));
|
|
if (!target_is_pushed (this))
|
|
push_target (this);
|
|
}
|
|
|
|
void
|
|
procfs_target::detach (inferior *inf, int from_tty)
|
|
{
|
|
int pid = inferior_ptid.pid ();
|
|
|
|
if (from_tty)
|
|
{
|
|
const char *exec_file;
|
|
|
|
exec_file = get_exec_file (0);
|
|
if (exec_file == NULL)
|
|
exec_file = "";
|
|
|
|
printf_filtered (_("Detaching from program: %s, %s\n"), exec_file,
|
|
target_pid_to_str (ptid_t (pid)).c_str ());
|
|
}
|
|
|
|
do_detach ();
|
|
|
|
inferior_ptid = null_ptid;
|
|
detach_inferior (inf);
|
|
maybe_unpush_target ();
|
|
}
|
|
|
|
static ptid_t
|
|
do_attach (ptid_t ptid)
|
|
{
|
|
procinfo *pi;
|
|
struct inferior *inf;
|
|
int fail;
|
|
int lwpid;
|
|
|
|
pi = create_procinfo (ptid.pid (), 0);
|
|
if (pi == NULL)
|
|
perror (_("procfs: out of memory in 'attach'"));
|
|
|
|
if (!open_procinfo_files (pi, FD_CTL))
|
|
{
|
|
fprintf_filtered (gdb_stderr, "procfs:%d -- ", __LINE__);
|
|
xsnprintf (errmsg, sizeof (errmsg),
|
|
"do_attach: couldn't open /proc file for process %d",
|
|
ptid.pid ());
|
|
dead_procinfo (pi, errmsg, NOKILL);
|
|
}
|
|
|
|
/* Stop the process (if it isn't already stopped). */
|
|
if (proc_flags (pi) & (PR_STOPPED | PR_ISTOP))
|
|
{
|
|
pi->was_stopped = 1;
|
|
proc_prettyprint_why (proc_why (pi), proc_what (pi), 1);
|
|
}
|
|
else
|
|
{
|
|
pi->was_stopped = 0;
|
|
/* Set the process to run again when we close it. */
|
|
if (!proc_set_run_on_last_close (pi))
|
|
dead_procinfo (pi, "do_attach: couldn't set RLC.", NOKILL);
|
|
|
|
/* Now stop the process. */
|
|
if (!proc_stop_process (pi))
|
|
dead_procinfo (pi, "do_attach: couldn't stop the process.", NOKILL);
|
|
pi->ignore_next_sigstop = 1;
|
|
}
|
|
/* Save some of the /proc state to be restored if we detach. */
|
|
if (!proc_get_traced_faults (pi, &pi->saved_fltset))
|
|
dead_procinfo (pi, "do_attach: couldn't save traced faults.", NOKILL);
|
|
if (!proc_get_traced_signals (pi, &pi->saved_sigset))
|
|
dead_procinfo (pi, "do_attach: couldn't save traced signals.", NOKILL);
|
|
if (!proc_get_traced_sysentry (pi, pi->saved_entryset))
|
|
dead_procinfo (pi, "do_attach: couldn't save traced syscall entries.",
|
|
NOKILL);
|
|
if (!proc_get_traced_sysexit (pi, pi->saved_exitset))
|
|
dead_procinfo (pi, "do_attach: couldn't save traced syscall exits.",
|
|
NOKILL);
|
|
if (!proc_get_held_signals (pi, &pi->saved_sighold))
|
|
dead_procinfo (pi, "do_attach: couldn't save held signals.", NOKILL);
|
|
|
|
fail = procfs_debug_inferior (pi);
|
|
if (fail != 0)
|
|
dead_procinfo (pi, "do_attach: failed in procfs_debug_inferior", NOKILL);
|
|
|
|
inf = current_inferior ();
|
|
inferior_appeared (inf, pi->pid);
|
|
/* Let GDB know that the inferior was attached. */
|
|
inf->attach_flag = 1;
|
|
|
|
/* Create a procinfo for the current lwp. */
|
|
lwpid = proc_get_current_thread (pi);
|
|
create_procinfo (pi->pid, lwpid);
|
|
|
|
/* Add it to gdb's thread list. */
|
|
ptid = ptid_t (pi->pid, lwpid, 0);
|
|
add_thread (&the_procfs_target, ptid);
|
|
|
|
return ptid;
|
|
}
|
|
|
|
static void
|
|
do_detach ()
|
|
{
|
|
procinfo *pi;
|
|
|
|
/* Find procinfo for the main process. */
|
|
pi = find_procinfo_or_die (inferior_ptid.pid (),
|
|
0); /* FIXME: threads */
|
|
|
|
if (!proc_set_traced_signals (pi, &pi->saved_sigset))
|
|
proc_warn (pi, "do_detach, set_traced_signal", __LINE__);
|
|
|
|
if (!proc_set_traced_faults (pi, &pi->saved_fltset))
|
|
proc_warn (pi, "do_detach, set_traced_faults", __LINE__);
|
|
|
|
if (!proc_set_traced_sysentry (pi, pi->saved_entryset))
|
|
proc_warn (pi, "do_detach, set_traced_sysentry", __LINE__);
|
|
|
|
if (!proc_set_traced_sysexit (pi, pi->saved_exitset))
|
|
proc_warn (pi, "do_detach, set_traced_sysexit", __LINE__);
|
|
|
|
if (!proc_set_held_signals (pi, &pi->saved_sighold))
|
|
proc_warn (pi, "do_detach, set_held_signals", __LINE__);
|
|
|
|
if (proc_flags (pi) & (PR_STOPPED | PR_ISTOP))
|
|
if (!(pi->was_stopped)
|
|
|| query (_("Was stopped when attached, make it runnable again? ")))
|
|
{
|
|
/* Clear any pending signal. */
|
|
if (!proc_clear_current_fault (pi))
|
|
proc_warn (pi, "do_detach, clear_current_fault", __LINE__);
|
|
|
|
if (!proc_clear_current_signal (pi))
|
|
proc_warn (pi, "do_detach, clear_current_signal", __LINE__);
|
|
|
|
if (!proc_set_run_on_last_close (pi))
|
|
proc_warn (pi, "do_detach, set_rlc", __LINE__);
|
|
}
|
|
|
|
destroy_procinfo (pi);
|
|
}
|
|
|
|
/* Fetch register REGNUM from the inferior. If REGNUM is -1, do this
|
|
for all registers.
|
|
|
|
??? Is the following note still relevant? We can't get individual
|
|
registers with the PT_GETREGS ptrace(2) request either, yet we
|
|
don't bother with caching at all in that case.
|
|
|
|
NOTE: Since the /proc interface cannot give us individual
|
|
registers, we pay no attention to REGNUM, and just fetch them all.
|
|
This results in the possibility that we will do unnecessarily many
|
|
fetches, since we may be called repeatedly for individual
|
|
registers. So we cache the results, and mark the cache invalid
|
|
when the process is resumed. */
|
|
|
|
void
|
|
procfs_target::fetch_registers (struct regcache *regcache, int regnum)
|
|
{
|
|
gdb_gregset_t *gregs;
|
|
procinfo *pi;
|
|
ptid_t ptid = regcache->ptid ();
|
|
int pid = ptid.pid ();
|
|
int tid = ptid.lwp ();
|
|
struct gdbarch *gdbarch = regcache->arch ();
|
|
|
|
pi = find_procinfo_or_die (pid, tid);
|
|
|
|
if (pi == NULL)
|
|
error (_("procfs: fetch_registers failed to find procinfo for %s"),
|
|
target_pid_to_str (ptid).c_str ());
|
|
|
|
gregs = proc_get_gregs (pi);
|
|
if (gregs == NULL)
|
|
proc_error (pi, "fetch_registers, get_gregs", __LINE__);
|
|
|
|
supply_gregset (regcache, (const gdb_gregset_t *) gregs);
|
|
|
|
if (gdbarch_fp0_regnum (gdbarch) >= 0) /* Do we have an FPU? */
|
|
{
|
|
gdb_fpregset_t *fpregs;
|
|
|
|
if ((regnum >= 0 && regnum < gdbarch_fp0_regnum (gdbarch))
|
|
|| regnum == gdbarch_pc_regnum (gdbarch)
|
|
|| regnum == gdbarch_sp_regnum (gdbarch))
|
|
return; /* Not a floating point register. */
|
|
|
|
fpregs = proc_get_fpregs (pi);
|
|
if (fpregs == NULL)
|
|
proc_error (pi, "fetch_registers, get_fpregs", __LINE__);
|
|
|
|
supply_fpregset (regcache, (const gdb_fpregset_t *) fpregs);
|
|
}
|
|
}
|
|
|
|
/* Store register REGNUM back into the inferior. If REGNUM is -1, do
|
|
this for all registers.
|
|
|
|
NOTE: Since the /proc interface will not read individual registers,
|
|
we will cache these requests until the process is resumed, and only
|
|
then write them back to the inferior process.
|
|
|
|
FIXME: is that a really bad idea? Have to think about cases where
|
|
writing one register might affect the value of others, etc. */
|
|
|
|
void
|
|
procfs_target::store_registers (struct regcache *regcache, int regnum)
|
|
{
|
|
gdb_gregset_t *gregs;
|
|
procinfo *pi;
|
|
ptid_t ptid = regcache->ptid ();
|
|
int pid = ptid.pid ();
|
|
int tid = ptid.lwp ();
|
|
struct gdbarch *gdbarch = regcache->arch ();
|
|
|
|
pi = find_procinfo_or_die (pid, tid);
|
|
|
|
if (pi == NULL)
|
|
error (_("procfs: store_registers: failed to find procinfo for %s"),
|
|
target_pid_to_str (ptid).c_str ());
|
|
|
|
gregs = proc_get_gregs (pi);
|
|
if (gregs == NULL)
|
|
proc_error (pi, "store_registers, get_gregs", __LINE__);
|
|
|
|
fill_gregset (regcache, gregs, regnum);
|
|
if (!proc_set_gregs (pi))
|
|
proc_error (pi, "store_registers, set_gregs", __LINE__);
|
|
|
|
if (gdbarch_fp0_regnum (gdbarch) >= 0) /* Do we have an FPU? */
|
|
{
|
|
gdb_fpregset_t *fpregs;
|
|
|
|
if ((regnum >= 0 && regnum < gdbarch_fp0_regnum (gdbarch))
|
|
|| regnum == gdbarch_pc_regnum (gdbarch)
|
|
|| regnum == gdbarch_sp_regnum (gdbarch))
|
|
return; /* Not a floating point register. */
|
|
|
|
fpregs = proc_get_fpregs (pi);
|
|
if (fpregs == NULL)
|
|
proc_error (pi, "store_registers, get_fpregs", __LINE__);
|
|
|
|
fill_fpregset (regcache, fpregs, regnum);
|
|
if (!proc_set_fpregs (pi))
|
|
proc_error (pi, "store_registers, set_fpregs", __LINE__);
|
|
}
|
|
}
|
|
|
|
static int
|
|
syscall_is_lwp_exit (procinfo *pi, int scall)
|
|
{
|
|
if (scall == SYS_lwp_exit)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
syscall_is_exit (procinfo *pi, int scall)
|
|
{
|
|
if (scall == SYS_exit)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
syscall_is_exec (procinfo *pi, int scall)
|
|
{
|
|
#ifdef SYS_exec
|
|
if (scall == SYS_exec)
|
|
return 1;
|
|
#endif
|
|
if (scall == SYS_execve)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
syscall_is_lwp_create (procinfo *pi, int scall)
|
|
{
|
|
if (scall == SYS_lwp_create)
|
|
return 1;
|
|
return 0;
|
|
}
|
|
|
|
/* Retrieve the next stop event from the child process. If child has
|
|
not stopped yet, wait for it to stop. Translate /proc eventcodes
|
|
(or possibly wait eventcodes) into gdb internal event codes.
|
|
Returns the id of process (and possibly thread) that incurred the
|
|
event. Event codes are returned through a pointer parameter. */
|
|
|
|
ptid_t
|
|
procfs_target::wait (ptid_t ptid, struct target_waitstatus *status,
|
|
int options)
|
|
{
|
|
/* First cut: loosely based on original version 2.1. */
|
|
procinfo *pi;
|
|
int wstat;
|
|
int temp_tid;
|
|
ptid_t retval, temp_ptid;
|
|
int why, what, flags;
|
|
int retry = 0;
|
|
|
|
wait_again:
|
|
|
|
retry++;
|
|
wstat = 0;
|
|
retval = ptid_t (-1);
|
|
|
|
/* Find procinfo for main process. */
|
|
pi = find_procinfo_or_die (inferior_ptid.pid (), 0);
|
|
if (pi)
|
|
{
|
|
/* We must assume that the status is stale now... */
|
|
pi->status_valid = 0;
|
|
pi->gregs_valid = 0;
|
|
pi->fpregs_valid = 0;
|
|
|
|
#if 0 /* just try this out... */
|
|
flags = proc_flags (pi);
|
|
why = proc_why (pi);
|
|
if ((flags & PR_STOPPED) && (why == PR_REQUESTED))
|
|
pi->status_valid = 0; /* re-read again, IMMEDIATELY... */
|
|
#endif
|
|
/* If child is not stopped, wait for it to stop. */
|
|
if (!(proc_flags (pi) & (PR_STOPPED | PR_ISTOP))
|
|
&& !proc_wait_for_stop (pi))
|
|
{
|
|
/* wait_for_stop failed: has the child terminated? */
|
|
if (errno == ENOENT)
|
|
{
|
|
int wait_retval;
|
|
|
|
/* /proc file not found; presumably child has terminated. */
|
|
wait_retval = ::wait (&wstat); /* "wait" for the child's exit. */
|
|
|
|
/* Wrong child? */
|
|
if (wait_retval != inferior_ptid.pid ())
|
|
error (_("procfs: couldn't stop "
|
|
"process %d: wait returned %d."),
|
|
inferior_ptid.pid (), wait_retval);
|
|
/* FIXME: might I not just use waitpid?
|
|
Or try find_procinfo to see if I know about this child? */
|
|
retval = ptid_t (wait_retval);
|
|
}
|
|
else if (errno == EINTR)
|
|
goto wait_again;
|
|
else
|
|
{
|
|
/* Unknown error from wait_for_stop. */
|
|
proc_error (pi, "target_wait (wait_for_stop)", __LINE__);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* This long block is reached if either:
|
|
a) the child was already stopped, or
|
|
b) we successfully waited for the child with wait_for_stop.
|
|
This block will analyze the /proc status, and translate it
|
|
into a waitstatus for GDB.
|
|
|
|
If we actually had to call wait because the /proc file
|
|
is gone (child terminated), then we skip this block,
|
|
because we already have a waitstatus. */
|
|
|
|
flags = proc_flags (pi);
|
|
why = proc_why (pi);
|
|
what = proc_what (pi);
|
|
|
|
if (flags & (PR_STOPPED | PR_ISTOP))
|
|
{
|
|
/* If it's running async (for single_thread control),
|
|
set it back to normal again. */
|
|
if (flags & PR_ASYNC)
|
|
if (!proc_unset_async (pi))
|
|
proc_error (pi, "target_wait, unset_async", __LINE__);
|
|
|
|
if (info_verbose)
|
|
proc_prettyprint_why (why, what, 1);
|
|
|
|
/* The 'pid' we will return to GDB is composed of
|
|
the process ID plus the lwp ID. */
|
|
retval = ptid_t (pi->pid, proc_get_current_thread (pi), 0);
|
|
|
|
switch (why) {
|
|
case PR_SIGNALLED:
|
|
wstat = (what << 8) | 0177;
|
|
break;
|
|
case PR_SYSENTRY:
|
|
if (syscall_is_lwp_exit (pi, what))
|
|
{
|
|
if (print_thread_events)
|
|
printf_unfiltered (_("[%s exited]\n"),
|
|
target_pid_to_str (retval).c_str ());
|
|
delete_thread (find_thread_ptid (this, retval));
|
|
status->kind = TARGET_WAITKIND_SPURIOUS;
|
|
return retval;
|
|
}
|
|
else if (syscall_is_exit (pi, what))
|
|
{
|
|
struct inferior *inf;
|
|
|
|
/* Handle SYS_exit call only. */
|
|
/* Stopped at entry to SYS_exit.
|
|
Make it runnable, resume it, then use
|
|
the wait system call to get its exit code.
|
|
Proc_run_process always clears the current
|
|
fault and signal.
|
|
Then return its exit status. */
|
|
pi->status_valid = 0;
|
|
wstat = 0;
|
|
/* FIXME: what we should do is return
|
|
TARGET_WAITKIND_SPURIOUS. */
|
|
if (!proc_run_process (pi, 0, 0))
|
|
proc_error (pi, "target_wait, run_process", __LINE__);
|
|
|
|
inf = find_inferior_pid (this, pi->pid);
|
|
if (inf->attach_flag)
|
|
{
|
|
/* Don't call wait: simulate waiting for exit,
|
|
return a "success" exit code. Bogus: what if
|
|
it returns something else? */
|
|
wstat = 0;
|
|
retval = inferior_ptid; /* ? ? ? */
|
|
}
|
|
else
|
|
{
|
|
int temp = ::wait (&wstat);
|
|
|
|
/* FIXME: shouldn't I make sure I get the right
|
|
event from the right process? If (for
|
|
instance) I have killed an earlier inferior
|
|
process but failed to clean up after it
|
|
somehow, I could get its termination event
|
|
here. */
|
|
|
|
/* If wait returns -1, that's what we return
|
|
to GDB. */
|
|
if (temp < 0)
|
|
retval = ptid_t (temp);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
printf_filtered (_("procfs: trapped on entry to "));
|
|
proc_prettyprint_syscall (proc_what (pi), 0);
|
|
printf_filtered ("\n");
|
|
|
|
long i, nsysargs, *sysargs;
|
|
|
|
nsysargs = proc_nsysarg (pi);
|
|
sysargs = proc_sysargs (pi);
|
|
|
|
if (nsysargs > 0 && sysargs != NULL)
|
|
{
|
|
printf_filtered (_("%ld syscall arguments:\n"),
|
|
nsysargs);
|
|
for (i = 0; i < nsysargs; i++)
|
|
printf_filtered ("#%ld: 0x%08lx\n",
|
|
i, sysargs[i]);
|
|
}
|
|
|
|
if (status)
|
|
{
|
|
/* How to exit gracefully, returning "unknown
|
|
event". */
|
|
status->kind = TARGET_WAITKIND_SPURIOUS;
|
|
return inferior_ptid;
|
|
}
|
|
else
|
|
{
|
|
/* How to keep going without returning to wfi: */
|
|
target_continue_no_signal (ptid);
|
|
goto wait_again;
|
|
}
|
|
}
|
|
break;
|
|
case PR_SYSEXIT:
|
|
if (syscall_is_exec (pi, what))
|
|
{
|
|
/* Hopefully this is our own "fork-child" execing
|
|
the real child. Hoax this event into a trap, and
|
|
GDB will see the child about to execute its start
|
|
address. */
|
|
wstat = (SIGTRAP << 8) | 0177;
|
|
}
|
|
else if (syscall_is_lwp_create (pi, what))
|
|
{
|
|
/* This syscall is somewhat like fork/exec. We
|
|
will get the event twice: once for the parent
|
|
LWP, and once for the child. We should already
|
|
know about the parent LWP, but the child will
|
|
be new to us. So, whenever we get this event,
|
|
if it represents a new thread, simply add the
|
|
thread to the list. */
|
|
|
|
/* If not in procinfo list, add it. */
|
|
temp_tid = proc_get_current_thread (pi);
|
|
if (!find_procinfo (pi->pid, temp_tid))
|
|
create_procinfo (pi->pid, temp_tid);
|
|
|
|
temp_ptid = ptid_t (pi->pid, temp_tid, 0);
|
|
/* If not in GDB's thread list, add it. */
|
|
if (!in_thread_list (this, temp_ptid))
|
|
add_thread (this, temp_ptid);
|
|
|
|
/* Return to WFI, but tell it to immediately resume. */
|
|
status->kind = TARGET_WAITKIND_SPURIOUS;
|
|
return inferior_ptid;
|
|
}
|
|
else if (syscall_is_lwp_exit (pi, what))
|
|
{
|
|
if (print_thread_events)
|
|
printf_unfiltered (_("[%s exited]\n"),
|
|
target_pid_to_str (retval).c_str ());
|
|
delete_thread (find_thread_ptid (this, retval));
|
|
status->kind = TARGET_WAITKIND_SPURIOUS;
|
|
return retval;
|
|
}
|
|
else if (0)
|
|
{
|
|
/* FIXME: Do we need to handle SYS_sproc,
|
|
SYS_fork, or SYS_vfork here? The old procfs
|
|
seemed to use this event to handle threads on
|
|
older (non-LWP) systems, where I'm assuming
|
|
that threads were actually separate processes.
|
|
Irix, maybe? Anyway, low priority for now. */
|
|
}
|
|
else
|
|
{
|
|
printf_filtered (_("procfs: trapped on exit from "));
|
|
proc_prettyprint_syscall (proc_what (pi), 0);
|
|
printf_filtered ("\n");
|
|
|
|
long i, nsysargs, *sysargs;
|
|
|
|
nsysargs = proc_nsysarg (pi);
|
|
sysargs = proc_sysargs (pi);
|
|
|
|
if (nsysargs > 0 && sysargs != NULL)
|
|
{
|
|
printf_filtered (_("%ld syscall arguments:\n"),
|
|
nsysargs);
|
|
for (i = 0; i < nsysargs; i++)
|
|
printf_filtered ("#%ld: 0x%08lx\n",
|
|
i, sysargs[i]);
|
|
}
|
|
|
|
status->kind = TARGET_WAITKIND_SPURIOUS;
|
|
return inferior_ptid;
|
|
}
|
|
break;
|
|
case PR_REQUESTED:
|
|
#if 0 /* FIXME */
|
|
wstat = (SIGSTOP << 8) | 0177;
|
|
break;
|
|
#else
|
|
if (retry < 5)
|
|
{
|
|
printf_filtered (_("Retry #%d:\n"), retry);
|
|
pi->status_valid = 0;
|
|
goto wait_again;
|
|
}
|
|
else
|
|
{
|
|
/* If not in procinfo list, add it. */
|
|
temp_tid = proc_get_current_thread (pi);
|
|
if (!find_procinfo (pi->pid, temp_tid))
|
|
create_procinfo (pi->pid, temp_tid);
|
|
|
|
/* If not in GDB's thread list, add it. */
|
|
temp_ptid = ptid_t (pi->pid, temp_tid, 0);
|
|
if (!in_thread_list (this, temp_ptid))
|
|
add_thread (this, temp_ptid);
|
|
|
|
status->kind = TARGET_WAITKIND_STOPPED;
|
|
status->value.sig = GDB_SIGNAL_0;
|
|
return retval;
|
|
}
|
|
#endif
|
|
case PR_JOBCONTROL:
|
|
wstat = (what << 8) | 0177;
|
|
break;
|
|
case PR_FAULTED:
|
|
{
|
|
int signo = pi->prstatus.pr_lwp.pr_info.si_signo;
|
|
if (signo != 0)
|
|
wstat = (signo << 8) | 0177;
|
|
}
|
|
break;
|
|
default: /* switch (why) unmatched */
|
|
printf_filtered ("procfs:%d -- ", __LINE__);
|
|
printf_filtered (_("child stopped for unknown reason:\n"));
|
|
proc_prettyprint_why (why, what, 1);
|
|
error (_("... giving up..."));
|
|
break;
|
|
}
|
|
/* Got this far without error: If retval isn't in the
|
|
threads database, add it. */
|
|
if (retval.pid () > 0
|
|
&& retval != inferior_ptid
|
|
&& !in_thread_list (this, retval))
|
|
{
|
|
/* We have a new thread. We need to add it both to
|
|
GDB's list and to our own. If we don't create a
|
|
procinfo, resume may be unhappy later. */
|
|
add_thread (this, retval);
|
|
if (find_procinfo (retval.pid (),
|
|
retval.lwp ()) == NULL)
|
|
create_procinfo (retval.pid (),
|
|
retval.lwp ());
|
|
}
|
|
}
|
|
else /* Flags do not indicate STOPPED. */
|
|
{
|
|
/* surely this can't happen... */
|
|
printf_filtered ("procfs:%d -- process not stopped.\n",
|
|
__LINE__);
|
|
proc_prettyprint_flags (flags, 1);
|
|
error (_("procfs: ...giving up..."));
|
|
}
|
|
}
|
|
|
|
if (status)
|
|
store_waitstatus (status, wstat);
|
|
}
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* Perform a partial transfer to/from the specified object. For
|
|
memory transfers, fall back to the old memory xfer functions. */
|
|
|
|
enum target_xfer_status
|
|
procfs_target::xfer_partial (enum target_object object,
|
|
const char *annex, gdb_byte *readbuf,
|
|
const gdb_byte *writebuf, ULONGEST offset,
|
|
ULONGEST len, ULONGEST *xfered_len)
|
|
{
|
|
switch (object)
|
|
{
|
|
case TARGET_OBJECT_MEMORY:
|
|
return procfs_xfer_memory (readbuf, writebuf, offset, len, xfered_len);
|
|
|
|
case TARGET_OBJECT_AUXV:
|
|
return memory_xfer_auxv (this, object, annex, readbuf, writebuf,
|
|
offset, len, xfered_len);
|
|
|
|
default:
|
|
return this->beneath ()->xfer_partial (object, annex,
|
|
readbuf, writebuf, offset, len,
|
|
xfered_len);
|
|
}
|
|
}
|
|
|
|
/* Helper for procfs_xfer_partial that handles memory transfers.
|
|
Arguments are like target_xfer_partial. */
|
|
|
|
static enum target_xfer_status
|
|
procfs_xfer_memory (gdb_byte *readbuf, const gdb_byte *writebuf,
|
|
ULONGEST memaddr, ULONGEST len, ULONGEST *xfered_len)
|
|
{
|
|
procinfo *pi;
|
|
int nbytes;
|
|
|
|
/* Find procinfo for main process. */
|
|
pi = find_procinfo_or_die (inferior_ptid.pid (), 0);
|
|
if (pi->as_fd == 0 && open_procinfo_files (pi, FD_AS) == 0)
|
|
{
|
|
proc_warn (pi, "xfer_memory, open_proc_files", __LINE__);
|
|
return TARGET_XFER_E_IO;
|
|
}
|
|
|
|
if (lseek (pi->as_fd, (off_t) memaddr, SEEK_SET) != (off_t) memaddr)
|
|
return TARGET_XFER_E_IO;
|
|
|
|
if (writebuf != NULL)
|
|
{
|
|
PROCFS_NOTE ("write memory:\n");
|
|
nbytes = write (pi->as_fd, writebuf, len);
|
|
}
|
|
else
|
|
{
|
|
PROCFS_NOTE ("read memory:\n");
|
|
nbytes = read (pi->as_fd, readbuf, len);
|
|
}
|
|
if (nbytes <= 0)
|
|
return TARGET_XFER_E_IO;
|
|
*xfered_len = nbytes;
|
|
return TARGET_XFER_OK;
|
|
}
|
|
|
|
/* Called by target_resume before making child runnable. Mark cached
|
|
registers and status's invalid. If there are "dirty" caches that
|
|
need to be written back to the child process, do that.
|
|
|
|
File descriptors are also cached. As they are a limited resource,
|
|
we cannot hold onto them indefinitely. However, as they are
|
|
expensive to open, we don't want to throw them away
|
|
indiscriminately either. As a compromise, we will keep the file
|
|
descriptors for the parent process, but discard any file
|
|
descriptors we may have accumulated for the threads.
|
|
|
|
As this function is called by iterate_over_threads, it always
|
|
returns zero (so that iterate_over_threads will keep
|
|
iterating). */
|
|
|
|
static int
|
|
invalidate_cache (procinfo *parent, procinfo *pi, void *ptr)
|
|
{
|
|
/* About to run the child; invalidate caches and do any other
|
|
cleanup. */
|
|
|
|
#if 0
|
|
if (pi->gregs_dirty)
|
|
if (parent == NULL || proc_get_current_thread (parent) != pi->tid)
|
|
if (!proc_set_gregs (pi)) /* flush gregs cache */
|
|
proc_warn (pi, "target_resume, set_gregs",
|
|
__LINE__);
|
|
if (gdbarch_fp0_regnum (target_gdbarch ()) >= 0)
|
|
if (pi->fpregs_dirty)
|
|
if (parent == NULL || proc_get_current_thread (parent) != pi->tid)
|
|
if (!proc_set_fpregs (pi)) /* flush fpregs cache */
|
|
proc_warn (pi, "target_resume, set_fpregs",
|
|
__LINE__);
|
|
#endif
|
|
|
|
if (parent != NULL)
|
|
{
|
|
/* The presence of a parent indicates that this is an LWP.
|
|
Close any file descriptors that it might have open.
|
|
We don't do this to the master (parent) procinfo. */
|
|
|
|
close_procinfo_files (pi);
|
|
}
|
|
pi->gregs_valid = 0;
|
|
pi->fpregs_valid = 0;
|
|
#if 0
|
|
pi->gregs_dirty = 0;
|
|
pi->fpregs_dirty = 0;
|
|
#endif
|
|
pi->status_valid = 0;
|
|
pi->threads_valid = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
#if 0
|
|
/* A callback function for iterate_over_threads. Find the
|
|
asynchronous signal thread, and make it runnable. See if that
|
|
helps matters any. */
|
|
|
|
static int
|
|
make_signal_thread_runnable (procinfo *process, procinfo *pi, void *ptr)
|
|
{
|
|
#ifdef PR_ASLWP
|
|
if (proc_flags (pi) & PR_ASLWP)
|
|
{
|
|
if (!proc_run_process (pi, 0, -1))
|
|
proc_error (pi, "make_signal_thread_runnable", __LINE__);
|
|
return 1;
|
|
}
|
|
#endif
|
|
return 0;
|
|
}
|
|
#endif
|
|
|
|
/* Make the child process runnable. Normally we will then call
|
|
procfs_wait and wait for it to stop again (unless gdb is async).
|
|
|
|
If STEP is true, then arrange for the child to stop again after
|
|
executing a single instruction. If SIGNO is zero, then cancel any
|
|
pending signal; if non-zero, then arrange for the indicated signal
|
|
to be delivered to the child when it runs. If PID is -1, then
|
|
allow any child thread to run; if non-zero, then allow only the
|
|
indicated thread to run. (not implemented yet). */
|
|
|
|
void
|
|
procfs_target::resume (ptid_t ptid, int step, enum gdb_signal signo)
|
|
{
|
|
procinfo *pi, *thread;
|
|
int native_signo;
|
|
|
|
/* 2.1:
|
|
prrun.prflags |= PRSVADDR;
|
|
prrun.pr_vaddr = $PC; set resume address
|
|
prrun.prflags |= PRSTRACE; trace signals in pr_trace (all)
|
|
prrun.prflags |= PRSFAULT; trace faults in pr_fault (all but PAGE)
|
|
prrun.prflags |= PRCFAULT; clear current fault.
|
|
|
|
PRSTRACE and PRSFAULT can be done by other means
|
|
(proc_trace_signals, proc_trace_faults)
|
|
PRSVADDR is unnecessary.
|
|
PRCFAULT may be replaced by a PIOCCFAULT call (proc_clear_current_fault)
|
|
This basically leaves PRSTEP and PRCSIG.
|
|
PRCSIG is like PIOCSSIG (proc_clear_current_signal).
|
|
So basically PR_STEP is the sole argument that must be passed
|
|
to proc_run_process (for use in the prrun struct by ioctl). */
|
|
|
|
/* Find procinfo for main process. */
|
|
pi = find_procinfo_or_die (inferior_ptid.pid (), 0);
|
|
|
|
/* First cut: ignore pid argument. */
|
|
errno = 0;
|
|
|
|
/* Convert signal to host numbering. */
|
|
if (signo == 0 || (signo == GDB_SIGNAL_STOP && pi->ignore_next_sigstop))
|
|
native_signo = 0;
|
|
else
|
|
native_signo = gdb_signal_to_host (signo);
|
|
|
|
pi->ignore_next_sigstop = 0;
|
|
|
|
/* Running the process voids all cached registers and status. */
|
|
/* Void the threads' caches first. */
|
|
proc_iterate_over_threads (pi, invalidate_cache, NULL);
|
|
/* Void the process procinfo's caches. */
|
|
invalidate_cache (NULL, pi, NULL);
|
|
|
|
if (ptid.pid () != -1)
|
|
{
|
|
/* Resume a specific thread, presumably suppressing the
|
|
others. */
|
|
thread = find_procinfo (ptid.pid (), ptid.lwp ());
|
|
if (thread != NULL)
|
|
{
|
|
if (thread->tid != 0)
|
|
{
|
|
/* We're to resume a specific thread, and not the
|
|
others. Set the child process's PR_ASYNC flag. */
|
|
if (!proc_set_async (pi))
|
|
proc_error (pi, "target_resume, set_async", __LINE__);
|
|
#if 0
|
|
proc_iterate_over_threads (pi,
|
|
make_signal_thread_runnable,
|
|
NULL);
|
|
#endif
|
|
pi = thread; /* Substitute the thread's procinfo
|
|
for run. */
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!proc_run_process (pi, step, native_signo))
|
|
{
|
|
if (errno == EBUSY)
|
|
warning (_("resume: target already running. "
|
|
"Pretend to resume, and hope for the best!"));
|
|
else
|
|
proc_error (pi, "target_resume", __LINE__);
|
|
}
|
|
}
|
|
|
|
/* Set up to trace signals in the child process. */
|
|
|
|
void
|
|
procfs_target::pass_signals (gdb::array_view<const unsigned char> pass_signals)
|
|
{
|
|
sigset_t signals;
|
|
procinfo *pi = find_procinfo_or_die (inferior_ptid.pid (), 0);
|
|
int signo;
|
|
|
|
prfillset (&signals);
|
|
|
|
for (signo = 0; signo < NSIG; signo++)
|
|
{
|
|
int target_signo = gdb_signal_from_host (signo);
|
|
if (target_signo < pass_signals.size () && pass_signals[target_signo])
|
|
prdelset (&signals, signo);
|
|
}
|
|
|
|
if (!proc_set_traced_signals (pi, &signals))
|
|
proc_error (pi, "pass_signals", __LINE__);
|
|
}
|
|
|
|
/* Print status information about the child process. */
|
|
|
|
void
|
|
procfs_target::files_info ()
|
|
{
|
|
struct inferior *inf = current_inferior ();
|
|
|
|
printf_filtered (_("\tUsing the running image of %s %s via /proc.\n"),
|
|
inf->attach_flag? "attached": "child",
|
|
target_pid_to_str (inferior_ptid).c_str ());
|
|
}
|
|
|
|
/* Make it die. Wait for it to die. Clean up after it. Note: this
|
|
should only be applied to the real process, not to an LWP, because
|
|
of the check for parent-process. If we need this to work for an
|
|
LWP, it needs some more logic. */
|
|
|
|
static void
|
|
unconditionally_kill_inferior (procinfo *pi)
|
|
{
|
|
int parent_pid;
|
|
|
|
parent_pid = proc_parent_pid (pi);
|
|
if (!proc_kill (pi, SIGKILL))
|
|
proc_error (pi, "unconditionally_kill, proc_kill", __LINE__);
|
|
destroy_procinfo (pi);
|
|
|
|
/* If pi is GDB's child, wait for it to die. */
|
|
if (parent_pid == getpid ())
|
|
/* FIXME: should we use waitpid to make sure we get the right event?
|
|
Should we check the returned event? */
|
|
{
|
|
#if 0
|
|
int status, ret;
|
|
|
|
ret = waitpid (pi->pid, &status, 0);
|
|
#else
|
|
wait (NULL);
|
|
#endif
|
|
}
|
|
}
|
|
|
|
/* We're done debugging it, and we want it to go away. Then we want
|
|
GDB to forget all about it. */
|
|
|
|
void
|
|
procfs_target::kill ()
|
|
{
|
|
if (inferior_ptid != null_ptid) /* ? */
|
|
{
|
|
/* Find procinfo for main process. */
|
|
procinfo *pi = find_procinfo (inferior_ptid.pid (), 0);
|
|
|
|
if (pi)
|
|
unconditionally_kill_inferior (pi);
|
|
target_mourn_inferior (inferior_ptid);
|
|
}
|
|
}
|
|
|
|
/* Forget we ever debugged this thing! */
|
|
|
|
void
|
|
procfs_target::mourn_inferior ()
|
|
{
|
|
procinfo *pi;
|
|
|
|
if (inferior_ptid != null_ptid)
|
|
{
|
|
/* Find procinfo for main process. */
|
|
pi = find_procinfo (inferior_ptid.pid (), 0);
|
|
if (pi)
|
|
destroy_procinfo (pi);
|
|
}
|
|
|
|
generic_mourn_inferior ();
|
|
|
|
maybe_unpush_target ();
|
|
}
|
|
|
|
/* When GDB forks to create a runnable inferior process, this function
|
|
is called on the parent side of the fork. It's job is to do
|
|
whatever is necessary to make the child ready to be debugged, and
|
|
then wait for the child to synchronize. */
|
|
|
|
void
|
|
procfs_target::procfs_init_inferior (int pid)
|
|
{
|
|
procinfo *pi;
|
|
int fail;
|
|
int lwpid;
|
|
|
|
/* This routine called on the parent side (GDB side)
|
|
after GDB forks the inferior. */
|
|
if (!target_is_pushed (this))
|
|
push_target (this);
|
|
|
|
pi = create_procinfo (pid, 0);
|
|
if (pi == NULL)
|
|
perror (_("procfs: out of memory in 'init_inferior'"));
|
|
|
|
if (!open_procinfo_files (pi, FD_CTL))
|
|
proc_error (pi, "init_inferior, open_proc_files", __LINE__);
|
|
|
|
/*
|
|
xmalloc // done
|
|
open_procinfo_files // done
|
|
link list // done
|
|
prfillset (trace)
|
|
procfs_notice_signals
|
|
prfillset (fault)
|
|
prdelset (FLTPAGE)
|
|
PIOCWSTOP
|
|
PIOCSFAULT
|
|
*/
|
|
|
|
/* If not stopped yet, wait for it to stop. */
|
|
if (!(proc_flags (pi) & PR_STOPPED) && !(proc_wait_for_stop (pi)))
|
|
dead_procinfo (pi, "init_inferior: wait_for_stop failed", KILL);
|
|
|
|
/* Save some of the /proc state to be restored if we detach. */
|
|
/* FIXME: Why? In case another debugger was debugging it?
|
|
We're it's parent, for Ghu's sake! */
|
|
if (!proc_get_traced_signals (pi, &pi->saved_sigset))
|
|
proc_error (pi, "init_inferior, get_traced_signals", __LINE__);
|
|
if (!proc_get_held_signals (pi, &pi->saved_sighold))
|
|
proc_error (pi, "init_inferior, get_held_signals", __LINE__);
|
|
if (!proc_get_traced_faults (pi, &pi->saved_fltset))
|
|
proc_error (pi, "init_inferior, get_traced_faults", __LINE__);
|
|
if (!proc_get_traced_sysentry (pi, pi->saved_entryset))
|
|
proc_error (pi, "init_inferior, get_traced_sysentry", __LINE__);
|
|
if (!proc_get_traced_sysexit (pi, pi->saved_exitset))
|
|
proc_error (pi, "init_inferior, get_traced_sysexit", __LINE__);
|
|
|
|
fail = procfs_debug_inferior (pi);
|
|
if (fail != 0)
|
|
proc_error (pi, "init_inferior (procfs_debug_inferior)", fail);
|
|
|
|
/* FIXME: logically, we should really be turning OFF run-on-last-close,
|
|
and possibly even turning ON kill-on-last-close at this point. But
|
|
I can't make that change without careful testing which I don't have
|
|
time to do right now... */
|
|
/* Turn on run-on-last-close flag so that the child
|
|
will die if GDB goes away for some reason. */
|
|
if (!proc_set_run_on_last_close (pi))
|
|
proc_error (pi, "init_inferior, set_RLC", __LINE__);
|
|
|
|
/* We now have have access to the lwpid of the main thread/lwp. */
|
|
lwpid = proc_get_current_thread (pi);
|
|
|
|
/* Create a procinfo for the main lwp. */
|
|
create_procinfo (pid, lwpid);
|
|
|
|
/* We already have a main thread registered in the thread table at
|
|
this point, but it didn't have any lwp info yet. Notify the core
|
|
about it. This changes inferior_ptid as well. */
|
|
thread_change_ptid (this, ptid_t (pid), ptid_t (pid, lwpid, 0));
|
|
|
|
gdb_startup_inferior (pid, START_INFERIOR_TRAPS_EXPECTED);
|
|
}
|
|
|
|
/* When GDB forks to create a new process, this function is called on
|
|
the child side of the fork before GDB exec's the user program. Its
|
|
job is to make the child minimally debuggable, so that the parent
|
|
GDB process can connect to the child and take over. This function
|
|
should do only the minimum to make that possible, and to
|
|
synchronize with the parent process. The parent process should
|
|
take care of the details. */
|
|
|
|
static void
|
|
procfs_set_exec_trap (void)
|
|
{
|
|
/* This routine called on the child side (inferior side)
|
|
after GDB forks the inferior. It must use only local variables,
|
|
because it may be sharing data space with its parent. */
|
|
|
|
procinfo *pi;
|
|
sysset_t *exitset;
|
|
|
|
pi = create_procinfo (getpid (), 0);
|
|
if (pi == NULL)
|
|
perror_with_name (_("procfs: create_procinfo failed in child."));
|
|
|
|
if (open_procinfo_files (pi, FD_CTL) == 0)
|
|
{
|
|
proc_warn (pi, "set_exec_trap, open_proc_files", __LINE__);
|
|
gdb_flush (gdb_stderr);
|
|
/* No need to call "dead_procinfo", because we're going to
|
|
exit. */
|
|
_exit (127);
|
|
}
|
|
|
|
/* Method for tracing exec syscalls. */
|
|
/* GW: Rationale...
|
|
Not all systems with /proc have all the exec* syscalls with the same
|
|
names. On the SGI, for example, there is no SYS_exec, but there
|
|
*is* a SYS_execv. So, we try to account for that. */
|
|
|
|
exitset = XNEW (sysset_t);
|
|
premptyset (exitset);
|
|
#ifdef SYS_exec
|
|
praddset (exitset, SYS_exec);
|
|
#endif
|
|
praddset (exitset, SYS_execve);
|
|
|
|
if (!proc_set_traced_sysexit (pi, exitset))
|
|
{
|
|
proc_warn (pi, "set_exec_trap, set_traced_sysexit", __LINE__);
|
|
gdb_flush (gdb_stderr);
|
|
_exit (127);
|
|
}
|
|
|
|
/* FIXME: should this be done in the parent instead? */
|
|
/* Turn off inherit on fork flag so that all grand-children
|
|
of gdb start with tracing flags cleared. */
|
|
if (!proc_unset_inherit_on_fork (pi))
|
|
proc_warn (pi, "set_exec_trap, unset_inherit", __LINE__);
|
|
|
|
/* Turn off run on last close flag, so that the child process
|
|
cannot run away just because we close our handle on it.
|
|
We want it to wait for the parent to attach. */
|
|
if (!proc_unset_run_on_last_close (pi))
|
|
proc_warn (pi, "set_exec_trap, unset_RLC", __LINE__);
|
|
|
|
/* FIXME: No need to destroy the procinfo --
|
|
we have our own address space, and we're about to do an exec! */
|
|
/*destroy_procinfo (pi);*/
|
|
}
|
|
|
|
/* This function is called BEFORE gdb forks the inferior process. Its
|
|
only real responsibility is to set things up for the fork, and tell
|
|
GDB which two functions to call after the fork (one for the parent,
|
|
and one for the child).
|
|
|
|
This function does a complicated search for a unix shell program,
|
|
which it then uses to parse arguments and environment variables to
|
|
be sent to the child. I wonder whether this code could not be
|
|
abstracted out and shared with other unix targets such as
|
|
inf-ptrace? */
|
|
|
|
void
|
|
procfs_target::create_inferior (const char *exec_file,
|
|
const std::string &allargs,
|
|
char **env, int from_tty)
|
|
{
|
|
const char *shell_file = get_shell ();
|
|
char *tryname;
|
|
int pid;
|
|
|
|
if (strchr (shell_file, '/') == NULL)
|
|
{
|
|
|
|
/* We will be looking down the PATH to find shell_file. If we
|
|
just do this the normal way (via execlp, which operates by
|
|
attempting an exec for each element of the PATH until it
|
|
finds one which succeeds), then there will be an exec for
|
|
each failed attempt, each of which will cause a PR_SYSEXIT
|
|
stop, and we won't know how to distinguish the PR_SYSEXIT's
|
|
for these failed execs with the ones for successful execs
|
|
(whether the exec has succeeded is stored at that time in the
|
|
carry bit or some such architecture-specific and
|
|
non-ABI-specified place).
|
|
|
|
So I can't think of anything better than to search the PATH
|
|
now. This has several disadvantages: (1) There is a race
|
|
condition; if we find a file now and it is deleted before we
|
|
exec it, we lose, even if the deletion leaves a valid file
|
|
further down in the PATH, (2) there is no way to know exactly
|
|
what an executable (in the sense of "capable of being
|
|
exec'd") file is. Using access() loses because it may lose
|
|
if the caller is the superuser; failing to use it loses if
|
|
there are ACLs or some such. */
|
|
|
|
const char *p;
|
|
const char *p1;
|
|
/* FIXME-maybe: might want "set path" command so user can change what
|
|
path is used from within GDB. */
|
|
const char *path = getenv ("PATH");
|
|
int len;
|
|
struct stat statbuf;
|
|
|
|
if (path == NULL)
|
|
path = "/bin:/usr/bin";
|
|
|
|
tryname = (char *) alloca (strlen (path) + strlen (shell_file) + 2);
|
|
for (p = path; p != NULL; p = p1 ? p1 + 1: NULL)
|
|
{
|
|
p1 = strchr (p, ':');
|
|
if (p1 != NULL)
|
|
len = p1 - p;
|
|
else
|
|
len = strlen (p);
|
|
strncpy (tryname, p, len);
|
|
tryname[len] = '\0';
|
|
strcat (tryname, "/");
|
|
strcat (tryname, shell_file);
|
|
if (access (tryname, X_OK) < 0)
|
|
continue;
|
|
if (stat (tryname, &statbuf) < 0)
|
|
continue;
|
|
if (!S_ISREG (statbuf.st_mode))
|
|
/* We certainly need to reject directories. I'm not quite
|
|
as sure about FIFOs, sockets, etc., but I kind of doubt
|
|
that people want to exec() these things. */
|
|
continue;
|
|
break;
|
|
}
|
|
if (p == NULL)
|
|
/* Not found. This must be an error rather than merely passing
|
|
the file to execlp(), because execlp() would try all the
|
|
exec()s, causing GDB to get confused. */
|
|
error (_("procfs:%d -- Can't find shell %s in PATH"),
|
|
__LINE__, shell_file);
|
|
|
|
shell_file = tryname;
|
|
}
|
|
|
|
pid = fork_inferior (exec_file, allargs, env, procfs_set_exec_trap,
|
|
NULL, NULL, shell_file, NULL);
|
|
|
|
/* We have something that executes now. We'll be running through
|
|
the shell at this point (if startup-with-shell is true), but the
|
|
pid shouldn't change. */
|
|
add_thread_silent (this, ptid_t (pid));
|
|
|
|
procfs_init_inferior (pid);
|
|
}
|
|
|
|
/* An observer for the "inferior_created" event. */
|
|
|
|
static void
|
|
procfs_inferior_created (struct target_ops *ops, int from_tty)
|
|
{
|
|
}
|
|
|
|
/* Callback for update_thread_list. Calls "add_thread". */
|
|
|
|
static int
|
|
procfs_notice_thread (procinfo *pi, procinfo *thread, void *ptr)
|
|
{
|
|
ptid_t gdb_threadid = ptid_t (pi->pid, thread->tid, 0);
|
|
|
|
thread_info *thr = find_thread_ptid (&the_procfs_target, gdb_threadid);
|
|
if (thr == NULL || thr->state == THREAD_EXITED)
|
|
add_thread (&the_procfs_target, gdb_threadid);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Query all the threads that the target knows about, and give them
|
|
back to GDB to add to its list. */
|
|
|
|
void
|
|
procfs_target::update_thread_list ()
|
|
{
|
|
procinfo *pi;
|
|
|
|
prune_threads ();
|
|
|
|
/* Find procinfo for main process. */
|
|
pi = find_procinfo_or_die (inferior_ptid.pid (), 0);
|
|
proc_update_threads (pi);
|
|
proc_iterate_over_threads (pi, procfs_notice_thread, NULL);
|
|
}
|
|
|
|
/* Return true if the thread is still 'alive'. This guy doesn't
|
|
really seem to be doing his job. Got to investigate how to tell
|
|
when a thread is really gone. */
|
|
|
|
bool
|
|
procfs_target::thread_alive (ptid_t ptid)
|
|
{
|
|
int proc, thread;
|
|
procinfo *pi;
|
|
|
|
proc = ptid.pid ();
|
|
thread = ptid.lwp ();
|
|
/* If I don't know it, it ain't alive! */
|
|
pi = find_procinfo (proc, thread);
|
|
if (pi == NULL)
|
|
return false;
|
|
|
|
/* If I can't get its status, it ain't alive!
|
|
What's more, I need to forget about it! */
|
|
if (!proc_get_status (pi))
|
|
{
|
|
destroy_procinfo (pi);
|
|
return false;
|
|
}
|
|
/* I couldn't have got its status if it weren't alive, so it's
|
|
alive. */
|
|
return true;
|
|
}
|
|
|
|
/* Convert PTID to a string. */
|
|
|
|
std::string
|
|
procfs_target::pid_to_str (ptid_t ptid)
|
|
{
|
|
if (ptid.lwp () == 0)
|
|
return string_printf ("process %d", ptid.pid ());
|
|
else
|
|
return string_printf ("LWP %ld", ptid.lwp ());
|
|
}
|
|
|
|
/* Accepts an integer PID; Returns a string representing a file that
|
|
can be opened to get the symbols for the child process. */
|
|
|
|
char *
|
|
procfs_target::pid_to_exec_file (int pid)
|
|
{
|
|
static char buf[PATH_MAX];
|
|
char name[PATH_MAX];
|
|
|
|
/* Solaris 11 introduced /proc/<proc-id>/execname. */
|
|
xsnprintf (name, sizeof (name), "/proc/%d/execname", pid);
|
|
scoped_fd fd (gdb_open_cloexec (name, O_RDONLY, 0));
|
|
if (fd.get () < 0 || read (fd.get (), buf, PATH_MAX - 1) < 0)
|
|
{
|
|
/* If that fails, fall back to /proc/<proc-id>/path/a.out introduced in
|
|
Solaris 10. */
|
|
ssize_t len;
|
|
|
|
xsnprintf (name, sizeof (name), "/proc/%d/path/a.out", pid);
|
|
len = readlink (name, buf, PATH_MAX - 1);
|
|
if (len <= 0)
|
|
strcpy (buf, name);
|
|
else
|
|
buf[len] = '\0';
|
|
}
|
|
|
|
return buf;
|
|
}
|
|
|
|
/* Insert a watchpoint. */
|
|
|
|
static int
|
|
procfs_set_watchpoint (ptid_t ptid, CORE_ADDR addr, int len, int rwflag,
|
|
int after)
|
|
{
|
|
int pflags = 0;
|
|
procinfo *pi;
|
|
|
|
pi = find_procinfo_or_die (ptid.pid () == -1 ?
|
|
inferior_ptid.pid () : ptid.pid (),
|
|
0);
|
|
|
|
/* Translate from GDB's flags to /proc's. */
|
|
if (len > 0) /* len == 0 means delete watchpoint. */
|
|
{
|
|
switch (rwflag) { /* FIXME: need an enum! */
|
|
case hw_write: /* default watchpoint (write) */
|
|
pflags = WRITE_WATCHFLAG;
|
|
break;
|
|
case hw_read: /* read watchpoint */
|
|
pflags = READ_WATCHFLAG;
|
|
break;
|
|
case hw_access: /* access watchpoint */
|
|
pflags = READ_WATCHFLAG | WRITE_WATCHFLAG;
|
|
break;
|
|
case hw_execute: /* execution HW breakpoint */
|
|
pflags = EXEC_WATCHFLAG;
|
|
break;
|
|
default: /* Something weird. Return error. */
|
|
return -1;
|
|
}
|
|
if (after) /* Stop after r/w access is completed. */
|
|
pflags |= AFTER_WATCHFLAG;
|
|
}
|
|
|
|
if (!proc_set_watchpoint (pi, addr, len, pflags))
|
|
{
|
|
if (errno == E2BIG) /* Typical error for no resources. */
|
|
return -1; /* fail */
|
|
/* GDB may try to remove the same watchpoint twice.
|
|
If a remove request returns no match, don't error. */
|
|
if (errno == ESRCH && len == 0)
|
|
return 0; /* ignore */
|
|
proc_error (pi, "set_watchpoint", __LINE__);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* Return non-zero if we can set a hardware watchpoint of type TYPE. TYPE
|
|
is one of bp_hardware_watchpoint, bp_read_watchpoint, bp_write_watchpoint,
|
|
or bp_hardware_watchpoint. CNT is the number of watchpoints used so
|
|
far.
|
|
|
|
Note: procfs_can_use_hw_breakpoint() is not yet used by all
|
|
procfs.c targets due to the fact that some of them still define
|
|
target_can_use_hardware_watchpoint. */
|
|
|
|
int
|
|
procfs_target::can_use_hw_breakpoint (enum bptype type, int cnt, int othertype)
|
|
{
|
|
/* Due to the way that proc_set_watchpoint() is implemented, host
|
|
and target pointers must be of the same size. If they are not,
|
|
we can't use hardware watchpoints. This limitation is due to the
|
|
fact that proc_set_watchpoint() calls
|
|
procfs_address_to_host_pointer(); a close inspection of
|
|
procfs_address_to_host_pointer will reveal that an internal error
|
|
will be generated when the host and target pointer sizes are
|
|
different. */
|
|
struct type *ptr_type = builtin_type (target_gdbarch ())->builtin_data_ptr;
|
|
|
|
if (sizeof (void *) != TYPE_LENGTH (ptr_type))
|
|
return 0;
|
|
|
|
/* Other tests here??? */
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* Returns non-zero if process is stopped on a hardware watchpoint
|
|
fault, else returns zero. */
|
|
|
|
bool
|
|
procfs_target::stopped_by_watchpoint ()
|
|
{
|
|
procinfo *pi;
|
|
|
|
pi = find_procinfo_or_die (inferior_ptid.pid (), 0);
|
|
|
|
if (proc_flags (pi) & (PR_STOPPED | PR_ISTOP))
|
|
if (proc_why (pi) == PR_FAULTED)
|
|
if (proc_what (pi) == FLTWATCH)
|
|
return true;
|
|
return false;
|
|
}
|
|
|
|
/* Returns 1 if the OS knows the position of the triggered watchpoint,
|
|
and sets *ADDR to that address. Returns 0 if OS cannot report that
|
|
address. This function is only called if
|
|
procfs_stopped_by_watchpoint returned 1, thus no further checks are
|
|
done. The function also assumes that ADDR is not NULL. */
|
|
|
|
bool
|
|
procfs_target::stopped_data_address (CORE_ADDR *addr)
|
|
{
|
|
procinfo *pi;
|
|
|
|
pi = find_procinfo_or_die (inferior_ptid.pid (), 0);
|
|
return proc_watchpoint_address (pi, addr);
|
|
}
|
|
|
|
int
|
|
procfs_target::insert_watchpoint (CORE_ADDR addr, int len,
|
|
enum target_hw_bp_type type,
|
|
struct expression *cond)
|
|
{
|
|
if (!target_have_steppable_watchpoint
|
|
&& !gdbarch_have_nonsteppable_watchpoint (target_gdbarch ()))
|
|
/* When a hardware watchpoint fires off the PC will be left at
|
|
the instruction following the one which caused the
|
|
watchpoint. It will *NOT* be necessary for GDB to step over
|
|
the watchpoint. */
|
|
return procfs_set_watchpoint (inferior_ptid, addr, len, type, 1);
|
|
else
|
|
/* When a hardware watchpoint fires off the PC will be left at
|
|
the instruction which caused the watchpoint. It will be
|
|
necessary for GDB to step over the watchpoint. */
|
|
return procfs_set_watchpoint (inferior_ptid, addr, len, type, 0);
|
|
}
|
|
|
|
int
|
|
procfs_target::remove_watchpoint (CORE_ADDR addr, int len,
|
|
enum target_hw_bp_type type,
|
|
struct expression *cond)
|
|
{
|
|
return procfs_set_watchpoint (inferior_ptid, addr, 0, 0, 0);
|
|
}
|
|
|
|
int
|
|
procfs_target::region_ok_for_hw_watchpoint (CORE_ADDR addr, int len)
|
|
{
|
|
/* The man page for proc(4) on Solaris 2.6 and up says that the
|
|
system can support "thousands" of hardware watchpoints, but gives
|
|
no method for finding out how many; It doesn't say anything about
|
|
the allowed size for the watched area either. So we just tell
|
|
GDB 'yes'. */
|
|
return 1;
|
|
}
|
|
|
|
/* Memory Mappings Functions: */
|
|
|
|
/* Call a callback function once for each mapping, passing it the
|
|
mapping, an optional secondary callback function, and some optional
|
|
opaque data. Quit and return the first non-zero value returned
|
|
from the callback.
|
|
|
|
PI is the procinfo struct for the process to be mapped. FUNC is
|
|
the callback function to be called by this iterator. DATA is the
|
|
optional opaque data to be passed to the callback function.
|
|
CHILD_FUNC is the optional secondary function pointer to be passed
|
|
to the child function. Returns the first non-zero return value
|
|
from the callback function, or zero. */
|
|
|
|
static int
|
|
iterate_over_mappings (procinfo *pi, find_memory_region_ftype child_func,
|
|
void *data,
|
|
int (*func) (struct prmap *map,
|
|
find_memory_region_ftype child_func,
|
|
void *data))
|
|
{
|
|
char pathname[MAX_PROC_NAME_SIZE];
|
|
struct prmap *prmaps;
|
|
struct prmap *prmap;
|
|
int funcstat;
|
|
int nmap;
|
|
struct stat sbuf;
|
|
|
|
/* Get the number of mappings, allocate space,
|
|
and read the mappings into prmaps. */
|
|
/* Open map fd. */
|
|
xsnprintf (pathname, sizeof (pathname), "/proc/%d/map", pi->pid);
|
|
|
|
scoped_fd map_fd (open (pathname, O_RDONLY));
|
|
if (map_fd.get () < 0)
|
|
proc_error (pi, "iterate_over_mappings (open)", __LINE__);
|
|
|
|
/* Use stat to determine the file size, and compute
|
|
the number of prmap_t objects it contains. */
|
|
if (fstat (map_fd.get (), &sbuf) != 0)
|
|
proc_error (pi, "iterate_over_mappings (fstat)", __LINE__);
|
|
|
|
nmap = sbuf.st_size / sizeof (prmap_t);
|
|
prmaps = (struct prmap *) alloca ((nmap + 1) * sizeof (*prmaps));
|
|
if (read (map_fd.get (), (char *) prmaps, nmap * sizeof (*prmaps))
|
|
!= (nmap * sizeof (*prmaps)))
|
|
proc_error (pi, "iterate_over_mappings (read)", __LINE__);
|
|
|
|
for (prmap = prmaps; nmap > 0; prmap++, nmap--)
|
|
{
|
|
funcstat = (*func) (prmap, child_func, data);
|
|
if (funcstat != 0)
|
|
return funcstat;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Implements the to_find_memory_regions method. Calls an external
|
|
function for each memory region.
|
|
Returns the integer value returned by the callback. */
|
|
|
|
static int
|
|
find_memory_regions_callback (struct prmap *map,
|
|
find_memory_region_ftype func, void *data)
|
|
{
|
|
return (*func) ((CORE_ADDR) map->pr_vaddr,
|
|
map->pr_size,
|
|
(map->pr_mflags & MA_READ) != 0,
|
|
(map->pr_mflags & MA_WRITE) != 0,
|
|
(map->pr_mflags & MA_EXEC) != 0,
|
|
1, /* MODIFIED is unknown, pass it as true. */
|
|
data);
|
|
}
|
|
|
|
/* External interface. Calls a callback function once for each
|
|
mapped memory region in the child process, passing as arguments:
|
|
|
|
CORE_ADDR virtual_address,
|
|
unsigned long size,
|
|
int read, TRUE if region is readable by the child
|
|
int write, TRUE if region is writable by the child
|
|
int execute TRUE if region is executable by the child.
|
|
|
|
Stops iterating and returns the first non-zero value returned by
|
|
the callback. */
|
|
|
|
int
|
|
procfs_target::find_memory_regions (find_memory_region_ftype func, void *data)
|
|
{
|
|
procinfo *pi = find_procinfo_or_die (inferior_ptid.pid (), 0);
|
|
|
|
return iterate_over_mappings (pi, func, data,
|
|
find_memory_regions_callback);
|
|
}
|
|
|
|
/* Returns an ascii representation of a memory mapping's flags. */
|
|
|
|
static char *
|
|
mappingflags (long flags)
|
|
{
|
|
static char asciiflags[8];
|
|
|
|
strcpy (asciiflags, "-------");
|
|
if (flags & MA_STACK)
|
|
asciiflags[1] = 's';
|
|
if (flags & MA_BREAK)
|
|
asciiflags[2] = 'b';
|
|
if (flags & MA_SHARED)
|
|
asciiflags[3] = 's';
|
|
if (flags & MA_READ)
|
|
asciiflags[4] = 'r';
|
|
if (flags & MA_WRITE)
|
|
asciiflags[5] = 'w';
|
|
if (flags & MA_EXEC)
|
|
asciiflags[6] = 'x';
|
|
return (asciiflags);
|
|
}
|
|
|
|
/* Callback function, does the actual work for 'info proc
|
|
mappings'. */
|
|
|
|
static int
|
|
info_mappings_callback (struct prmap *map, find_memory_region_ftype ignore,
|
|
void *unused)
|
|
{
|
|
unsigned int pr_off;
|
|
|
|
pr_off = (unsigned int) map->pr_offset;
|
|
|
|
if (gdbarch_addr_bit (target_gdbarch ()) == 32)
|
|
printf_filtered ("\t%#10lx %#10lx %#10lx %#10x %7s\n",
|
|
(unsigned long) map->pr_vaddr,
|
|
(unsigned long) map->pr_vaddr + map->pr_size - 1,
|
|
(unsigned long) map->pr_size,
|
|
pr_off,
|
|
mappingflags (map->pr_mflags));
|
|
else
|
|
printf_filtered (" %#18lx %#18lx %#10lx %#10x %7s\n",
|
|
(unsigned long) map->pr_vaddr,
|
|
(unsigned long) map->pr_vaddr + map->pr_size - 1,
|
|
(unsigned long) map->pr_size,
|
|
pr_off,
|
|
mappingflags (map->pr_mflags));
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Implement the "info proc mappings" subcommand. */
|
|
|
|
static void
|
|
info_proc_mappings (procinfo *pi, int summary)
|
|
{
|
|
if (summary)
|
|
return; /* No output for summary mode. */
|
|
|
|
printf_filtered (_("Mapped address spaces:\n\n"));
|
|
if (gdbarch_ptr_bit (target_gdbarch ()) == 32)
|
|
printf_filtered ("\t%10s %10s %10s %10s %7s\n",
|
|
"Start Addr",
|
|
" End Addr",
|
|
" Size",
|
|
" Offset",
|
|
"Flags");
|
|
else
|
|
printf_filtered (" %18s %18s %10s %10s %7s\n",
|
|
"Start Addr",
|
|
" End Addr",
|
|
" Size",
|
|
" Offset",
|
|
"Flags");
|
|
|
|
iterate_over_mappings (pi, NULL, NULL, info_mappings_callback);
|
|
printf_filtered ("\n");
|
|
}
|
|
|
|
/* Implement the "info proc" command. */
|
|
|
|
bool
|
|
procfs_target::info_proc (const char *args, enum info_proc_what what)
|
|
{
|
|
procinfo *process = NULL;
|
|
procinfo *thread = NULL;
|
|
char *tmp = NULL;
|
|
int pid = 0;
|
|
int tid = 0;
|
|
int mappings = 0;
|
|
|
|
switch (what)
|
|
{
|
|
case IP_MINIMAL:
|
|
break;
|
|
|
|
case IP_MAPPINGS:
|
|
case IP_ALL:
|
|
mappings = 1;
|
|
break;
|
|
|
|
default:
|
|
error (_("Not supported on this target."));
|
|
}
|
|
|
|
gdb_argv built_argv (args);
|
|
for (char *arg : built_argv)
|
|
{
|
|
if (isdigit (arg[0]))
|
|
{
|
|
pid = strtoul (arg, &tmp, 10);
|
|
if (*tmp == '/')
|
|
tid = strtoul (++tmp, NULL, 10);
|
|
}
|
|
else if (arg[0] == '/')
|
|
{
|
|
tid = strtoul (arg + 1, NULL, 10);
|
|
}
|
|
}
|
|
|
|
procinfo_up temporary_procinfo;
|
|
if (pid == 0)
|
|
pid = inferior_ptid.pid ();
|
|
if (pid == 0)
|
|
error (_("No current process: you must name one."));
|
|
else
|
|
{
|
|
/* Have pid, will travel.
|
|
First see if it's a process we're already debugging. */
|
|
process = find_procinfo (pid, 0);
|
|
if (process == NULL)
|
|
{
|
|
/* No. So open a procinfo for it, but
|
|
remember to close it again when finished. */
|
|
process = create_procinfo (pid, 0);
|
|
temporary_procinfo.reset (process);
|
|
if (!open_procinfo_files (process, FD_CTL))
|
|
proc_error (process, "info proc, open_procinfo_files", __LINE__);
|
|
}
|
|
}
|
|
if (tid != 0)
|
|
thread = create_procinfo (pid, tid);
|
|
|
|
if (process)
|
|
{
|
|
printf_filtered (_("process %d flags:\n"), process->pid);
|
|
proc_prettyprint_flags (proc_flags (process), 1);
|
|
if (proc_flags (process) & (PR_STOPPED | PR_ISTOP))
|
|
proc_prettyprint_why (proc_why (process), proc_what (process), 1);
|
|
if (proc_get_nthreads (process) > 1)
|
|
printf_filtered ("Process has %d threads.\n",
|
|
proc_get_nthreads (process));
|
|
}
|
|
if (thread)
|
|
{
|
|
printf_filtered (_("thread %d flags:\n"), thread->tid);
|
|
proc_prettyprint_flags (proc_flags (thread), 1);
|
|
if (proc_flags (thread) & (PR_STOPPED | PR_ISTOP))
|
|
proc_prettyprint_why (proc_why (thread), proc_what (thread), 1);
|
|
}
|
|
|
|
if (mappings)
|
|
info_proc_mappings (process, 0);
|
|
|
|
return true;
|
|
}
|
|
|
|
/* Modify the status of the system call identified by SYSCALLNUM in
|
|
the set of syscalls that are currently traced/debugged.
|
|
|
|
If ENTRY_OR_EXIT is set to PR_SYSENTRY, then the entry syscalls set
|
|
will be updated. Otherwise, the exit syscalls set will be updated.
|
|
|
|
If MODE is FLAG_SET, then traces will be enabled. Otherwise, they
|
|
will be disabled. */
|
|
|
|
static void
|
|
proc_trace_syscalls_1 (procinfo *pi, int syscallnum, int entry_or_exit,
|
|
int mode, int from_tty)
|
|
{
|
|
sysset_t *sysset;
|
|
|
|
if (entry_or_exit == PR_SYSENTRY)
|
|
sysset = proc_get_traced_sysentry (pi, NULL);
|
|
else
|
|
sysset = proc_get_traced_sysexit (pi, NULL);
|
|
|
|
if (sysset == NULL)
|
|
proc_error (pi, "proc-trace, get_traced_sysset", __LINE__);
|
|
|
|
if (mode == FLAG_SET)
|
|
praddset (sysset, syscallnum);
|
|
else
|
|
prdelset (sysset, syscallnum);
|
|
|
|
if (entry_or_exit == PR_SYSENTRY)
|
|
{
|
|
if (!proc_set_traced_sysentry (pi, sysset))
|
|
proc_error (pi, "proc-trace, set_traced_sysentry", __LINE__);
|
|
}
|
|
else
|
|
{
|
|
if (!proc_set_traced_sysexit (pi, sysset))
|
|
proc_error (pi, "proc-trace, set_traced_sysexit", __LINE__);
|
|
}
|
|
}
|
|
|
|
static void
|
|
proc_trace_syscalls (const char *args, int from_tty, int entry_or_exit, int mode)
|
|
{
|
|
procinfo *pi;
|
|
|
|
if (inferior_ptid.pid () <= 0)
|
|
error (_("you must be debugging a process to use this command."));
|
|
|
|
if (args == NULL || args[0] == 0)
|
|
error_no_arg (_("system call to trace"));
|
|
|
|
pi = find_procinfo_or_die (inferior_ptid.pid (), 0);
|
|
if (isdigit (args[0]))
|
|
{
|
|
const int syscallnum = atoi (args);
|
|
|
|
proc_trace_syscalls_1 (pi, syscallnum, entry_or_exit, mode, from_tty);
|
|
}
|
|
}
|
|
|
|
static void
|
|
proc_trace_sysentry_cmd (const char *args, int from_tty)
|
|
{
|
|
proc_trace_syscalls (args, from_tty, PR_SYSENTRY, FLAG_SET);
|
|
}
|
|
|
|
static void
|
|
proc_trace_sysexit_cmd (const char *args, int from_tty)
|
|
{
|
|
proc_trace_syscalls (args, from_tty, PR_SYSEXIT, FLAG_SET);
|
|
}
|
|
|
|
static void
|
|
proc_untrace_sysentry_cmd (const char *args, int from_tty)
|
|
{
|
|
proc_trace_syscalls (args, from_tty, PR_SYSENTRY, FLAG_RESET);
|
|
}
|
|
|
|
static void
|
|
proc_untrace_sysexit_cmd (const char *args, int from_tty)
|
|
{
|
|
proc_trace_syscalls (args, from_tty, PR_SYSEXIT, FLAG_RESET);
|
|
}
|
|
|
|
void
|
|
_initialize_procfs (void)
|
|
{
|
|
gdb::observers::inferior_created.attach (procfs_inferior_created);
|
|
|
|
add_com ("proc-trace-entry", no_class, proc_trace_sysentry_cmd,
|
|
_("Give a trace of entries into the syscall."));
|
|
add_com ("proc-trace-exit", no_class, proc_trace_sysexit_cmd,
|
|
_("Give a trace of exits from the syscall."));
|
|
add_com ("proc-untrace-entry", no_class, proc_untrace_sysentry_cmd,
|
|
_("Cancel a trace of entries into the syscall."));
|
|
add_com ("proc-untrace-exit", no_class, proc_untrace_sysexit_cmd,
|
|
_("Cancel a trace of exits from the syscall."));
|
|
|
|
add_inf_child_target (&the_procfs_target);
|
|
}
|
|
|
|
/* =================== END, GDB "MODULE" =================== */
|
|
|
|
|
|
|
|
/* miscellaneous stubs: */
|
|
|
|
/* The following satisfy a few random symbols mostly created by the
|
|
solaris threads implementation, which I will chase down later. */
|
|
|
|
/* Return a pid for which we guarantee we will be able to find a
|
|
'live' procinfo. */
|
|
|
|
ptid_t
|
|
procfs_first_available (void)
|
|
{
|
|
return ptid_t (procinfo_list ? procinfo_list->pid : -1);
|
|
}
|
|
|
|
/* =================== GCORE .NOTE "MODULE" =================== */
|
|
|
|
static char *
|
|
procfs_do_thread_registers (bfd *obfd, ptid_t ptid,
|
|
char *note_data, int *note_size,
|
|
enum gdb_signal stop_signal)
|
|
{
|
|
struct regcache *regcache = get_thread_regcache (&the_procfs_target, ptid);
|
|
gdb_gregset_t gregs;
|
|
gdb_fpregset_t fpregs;
|
|
unsigned long merged_pid;
|
|
|
|
merged_pid = ptid.lwp () << 16 | ptid.pid ();
|
|
|
|
/* This part is the old method for fetching registers.
|
|
It should be replaced by the newer one using regsets
|
|
once it is implemented in this platform:
|
|
gdbarch_iterate_over_regset_sections(). */
|
|
|
|
scoped_restore save_inferior_ptid = make_scoped_restore (&inferior_ptid);
|
|
inferior_ptid = ptid;
|
|
target_fetch_registers (regcache, -1);
|
|
|
|
fill_gregset (regcache, &gregs, -1);
|
|
note_data = (char *) elfcore_write_lwpstatus (obfd,
|
|
note_data,
|
|
note_size,
|
|
merged_pid,
|
|
stop_signal,
|
|
&gregs);
|
|
fill_fpregset (regcache, &fpregs, -1);
|
|
note_data = (char *) elfcore_write_prfpreg (obfd,
|
|
note_data,
|
|
note_size,
|
|
&fpregs,
|
|
sizeof (fpregs));
|
|
|
|
return note_data;
|
|
}
|
|
|
|
struct procfs_corefile_thread_data {
|
|
bfd *obfd;
|
|
char *note_data;
|
|
int *note_size;
|
|
enum gdb_signal stop_signal;
|
|
};
|
|
|
|
static int
|
|
procfs_corefile_thread_callback (procinfo *pi, procinfo *thread, void *data)
|
|
{
|
|
struct procfs_corefile_thread_data *args
|
|
= (struct procfs_corefile_thread_data *) data;
|
|
|
|
if (pi != NULL)
|
|
{
|
|
ptid_t ptid = ptid_t (pi->pid, thread->tid, 0);
|
|
|
|
args->note_data = procfs_do_thread_registers (args->obfd, ptid,
|
|
args->note_data,
|
|
args->note_size,
|
|
args->stop_signal);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
find_signalled_thread (struct thread_info *info, void *data)
|
|
{
|
|
if (info->suspend.stop_signal != GDB_SIGNAL_0
|
|
&& info->ptid.pid () == inferior_ptid.pid ())
|
|
return 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static enum gdb_signal
|
|
find_stop_signal (void)
|
|
{
|
|
struct thread_info *info =
|
|
iterate_over_threads (find_signalled_thread, NULL);
|
|
|
|
if (info)
|
|
return info->suspend.stop_signal;
|
|
else
|
|
return GDB_SIGNAL_0;
|
|
}
|
|
|
|
char *
|
|
procfs_target::make_corefile_notes (bfd *obfd, int *note_size)
|
|
{
|
|
gdb_gregset_t gregs;
|
|
char fname[16] = {'\0'};
|
|
char psargs[80] = {'\0'};
|
|
procinfo *pi = find_procinfo_or_die (inferior_ptid.pid (), 0);
|
|
char *note_data = NULL;
|
|
const char *inf_args;
|
|
struct procfs_corefile_thread_data thread_args;
|
|
enum gdb_signal stop_signal;
|
|
|
|
if (get_exec_file (0))
|
|
{
|
|
strncpy (fname, lbasename (get_exec_file (0)), sizeof (fname));
|
|
fname[sizeof (fname) - 1] = 0;
|
|
strncpy (psargs, get_exec_file (0), sizeof (psargs));
|
|
psargs[sizeof (psargs) - 1] = 0;
|
|
|
|
inf_args = get_inferior_args ();
|
|
if (inf_args && *inf_args
|
|
&& (strlen (inf_args)
|
|
< ((int) sizeof (psargs) - (int) strlen (psargs))))
|
|
{
|
|
strncat (psargs, " ",
|
|
sizeof (psargs) - strlen (psargs));
|
|
strncat (psargs, inf_args,
|
|
sizeof (psargs) - strlen (psargs));
|
|
}
|
|
}
|
|
|
|
note_data = (char *) elfcore_write_prpsinfo (obfd,
|
|
note_data,
|
|
note_size,
|
|
fname,
|
|
psargs);
|
|
|
|
stop_signal = find_stop_signal ();
|
|
|
|
fill_gregset (get_current_regcache (), &gregs, -1);
|
|
note_data = elfcore_write_pstatus (obfd, note_data, note_size,
|
|
inferior_ptid.pid (),
|
|
stop_signal, &gregs);
|
|
|
|
thread_args.obfd = obfd;
|
|
thread_args.note_data = note_data;
|
|
thread_args.note_size = note_size;
|
|
thread_args.stop_signal = stop_signal;
|
|
proc_iterate_over_threads (pi, procfs_corefile_thread_callback,
|
|
&thread_args);
|
|
note_data = thread_args.note_data;
|
|
|
|
gdb::optional<gdb::byte_vector> auxv =
|
|
target_read_alloc (current_top_target (), TARGET_OBJECT_AUXV, NULL);
|
|
if (auxv && !auxv->empty ())
|
|
note_data = elfcore_write_note (obfd, note_data, note_size,
|
|
"CORE", NT_AUXV, auxv->data (),
|
|
auxv->size ());
|
|
|
|
return note_data;
|
|
}
|
|
/* =================== END GCORE .NOTE "MODULE" =================== */
|