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.
3275 lines
83 KiB
C
3275 lines
83 KiB
C
/* Branch trace support for GDB, the GNU debugger.
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Copyright (C) 2013-2020 Free Software Foundation, Inc.
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Contributed by Intel Corp. <markus.t.metzger@intel.com>
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This file is part of GDB.
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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
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the Free Software Foundation; either version 3 of the License, or
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(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 "record.h"
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#include "record-btrace.h"
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#include "gdbthread.h"
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#include "target.h"
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#include "gdbcmd.h"
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#include "disasm.h"
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#include "observable.h"
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#include "cli/cli-utils.h"
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#include "source.h"
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#include "ui-out.h"
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#include "symtab.h"
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#include "filenames.h"
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#include "regcache.h"
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#include "frame-unwind.h"
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#include "hashtab.h"
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#include "infrun.h"
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#include "event-loop.h"
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#include "inf-loop.h"
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#include "inferior.h"
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#include <algorithm>
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#include "gdbarch.h"
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#include "cli/cli-style.h"
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static const target_info record_btrace_target_info = {
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"record-btrace",
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N_("Branch tracing target"),
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N_("Collect control-flow trace and provide the execution history.")
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};
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/* The target_ops of record-btrace. */
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class record_btrace_target final : public target_ops
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{
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public:
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const target_info &info () const override
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{ return record_btrace_target_info; }
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strata stratum () const override { return record_stratum; }
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void close () override;
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void async (int) override;
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void detach (inferior *inf, int from_tty) override
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{ record_detach (this, inf, from_tty); }
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void disconnect (const char *, int) override;
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void mourn_inferior () override
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{ record_mourn_inferior (this); }
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void kill () override
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{ record_kill (this); }
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enum record_method record_method (ptid_t ptid) override;
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void stop_recording () override;
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void info_record () override;
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void insn_history (int size, gdb_disassembly_flags flags) override;
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void insn_history_from (ULONGEST from, int size,
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gdb_disassembly_flags flags) override;
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void insn_history_range (ULONGEST begin, ULONGEST end,
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gdb_disassembly_flags flags) override;
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void call_history (int size, record_print_flags flags) override;
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void call_history_from (ULONGEST begin, int size, record_print_flags flags)
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override;
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void call_history_range (ULONGEST begin, ULONGEST end, record_print_flags flags)
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override;
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bool record_is_replaying (ptid_t ptid) override;
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bool record_will_replay (ptid_t ptid, int dir) override;
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void record_stop_replaying () 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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int insert_breakpoint (struct gdbarch *,
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struct bp_target_info *) override;
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int remove_breakpoint (struct gdbarch *, struct bp_target_info *,
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enum remove_bp_reason) 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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void prepare_to_store (struct regcache *) override;
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const struct frame_unwind *get_unwinder () override;
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const struct frame_unwind *get_tailcall_unwinder () override;
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void commit_resume () 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 stop (ptid_t) 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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void goto_record_begin () override;
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void goto_record_end () override;
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void goto_record (ULONGEST insn) override;
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bool can_execute_reverse () override;
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bool stopped_by_sw_breakpoint () override;
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bool supports_stopped_by_sw_breakpoint () override;
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bool stopped_by_hw_breakpoint () override;
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bool supports_stopped_by_hw_breakpoint () override;
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enum exec_direction_kind execution_direction () override;
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void prepare_to_generate_core () override;
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void done_generating_core () override;
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};
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static record_btrace_target record_btrace_ops;
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/* Initialize the record-btrace target ops. */
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/* Token associated with a new-thread observer enabling branch tracing
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for the new thread. */
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static const gdb::observers::token record_btrace_thread_observer_token {};
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/* Memory access types used in set/show record btrace replay-memory-access. */
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static const char replay_memory_access_read_only[] = "read-only";
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static const char replay_memory_access_read_write[] = "read-write";
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static const char *const replay_memory_access_types[] =
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{
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replay_memory_access_read_only,
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replay_memory_access_read_write,
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NULL
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};
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/* The currently allowed replay memory access type. */
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static const char *replay_memory_access = replay_memory_access_read_only;
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/* The cpu state kinds. */
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enum record_btrace_cpu_state_kind
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{
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CS_AUTO,
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CS_NONE,
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CS_CPU
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};
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/* The current cpu state. */
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static enum record_btrace_cpu_state_kind record_btrace_cpu_state = CS_AUTO;
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/* The current cpu for trace decode. */
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static struct btrace_cpu record_btrace_cpu;
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/* Command lists for "set/show record btrace". */
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static struct cmd_list_element *set_record_btrace_cmdlist;
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static struct cmd_list_element *show_record_btrace_cmdlist;
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/* The execution direction of the last resume we got. See record-full.c. */
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static enum exec_direction_kind record_btrace_resume_exec_dir = EXEC_FORWARD;
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/* The async event handler for reverse/replay execution. */
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static struct async_event_handler *record_btrace_async_inferior_event_handler;
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/* A flag indicating that we are currently generating a core file. */
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static int record_btrace_generating_corefile;
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/* The current branch trace configuration. */
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static struct btrace_config record_btrace_conf;
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/* Command list for "record btrace". */
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static struct cmd_list_element *record_btrace_cmdlist;
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/* Command lists for "set/show record btrace bts". */
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static struct cmd_list_element *set_record_btrace_bts_cmdlist;
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static struct cmd_list_element *show_record_btrace_bts_cmdlist;
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/* Command lists for "set/show record btrace pt". */
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static struct cmd_list_element *set_record_btrace_pt_cmdlist;
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static struct cmd_list_element *show_record_btrace_pt_cmdlist;
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/* Command list for "set record btrace cpu". */
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static struct cmd_list_element *set_record_btrace_cpu_cmdlist;
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/* Print a record-btrace debug message. Use do ... while (0) to avoid
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ambiguities when used in if statements. */
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#define DEBUG(msg, args...) \
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do \
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{ \
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if (record_debug != 0) \
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fprintf_unfiltered (gdb_stdlog, \
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"[record-btrace] " msg "\n", ##args); \
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} \
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while (0)
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/* Return the cpu configured by the user. Returns NULL if the cpu was
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configured as auto. */
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const struct btrace_cpu *
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record_btrace_get_cpu (void)
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{
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switch (record_btrace_cpu_state)
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{
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case CS_AUTO:
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return nullptr;
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case CS_NONE:
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record_btrace_cpu.vendor = CV_UNKNOWN;
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/* Fall through. */
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case CS_CPU:
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return &record_btrace_cpu;
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}
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error (_("Internal error: bad record btrace cpu state."));
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}
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/* Update the branch trace for the current thread and return a pointer to its
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thread_info.
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Throws an error if there is no thread or no trace. This function never
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returns NULL. */
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static struct thread_info *
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require_btrace_thread (void)
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{
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DEBUG ("require");
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if (inferior_ptid == null_ptid)
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error (_("No thread."));
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thread_info *tp = inferior_thread ();
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validate_registers_access ();
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btrace_fetch (tp, record_btrace_get_cpu ());
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if (btrace_is_empty (tp))
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error (_("No trace."));
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return tp;
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}
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/* Update the branch trace for the current thread and return a pointer to its
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branch trace information struct.
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Throws an error if there is no thread or no trace. This function never
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returns NULL. */
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static struct btrace_thread_info *
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require_btrace (void)
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{
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struct thread_info *tp;
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tp = require_btrace_thread ();
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return &tp->btrace;
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}
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/* Enable branch tracing for one thread. Warn on errors. */
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static void
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record_btrace_enable_warn (struct thread_info *tp)
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{
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try
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{
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btrace_enable (tp, &record_btrace_conf);
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}
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catch (const gdb_exception_error &error)
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{
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warning ("%s", error.what ());
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}
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}
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/* Enable automatic tracing of new threads. */
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static void
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record_btrace_auto_enable (void)
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{
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DEBUG ("attach thread observer");
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gdb::observers::new_thread.attach (record_btrace_enable_warn,
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record_btrace_thread_observer_token);
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}
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/* Disable automatic tracing of new threads. */
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static void
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record_btrace_auto_disable (void)
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{
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DEBUG ("detach thread observer");
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gdb::observers::new_thread.detach (record_btrace_thread_observer_token);
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}
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/* The record-btrace async event handler function. */
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static void
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record_btrace_handle_async_inferior_event (gdb_client_data data)
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{
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inferior_event_handler (INF_REG_EVENT, NULL);
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}
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/* See record-btrace.h. */
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void
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record_btrace_push_target (void)
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{
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const char *format;
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record_btrace_auto_enable ();
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push_target (&record_btrace_ops);
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record_btrace_async_inferior_event_handler
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= create_async_event_handler (record_btrace_handle_async_inferior_event,
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NULL);
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record_btrace_generating_corefile = 0;
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format = btrace_format_short_string (record_btrace_conf.format);
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gdb::observers::record_changed.notify (current_inferior (), 1, "btrace", format);
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}
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/* Disable btrace on a set of threads on scope exit. */
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struct scoped_btrace_disable
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{
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scoped_btrace_disable () = default;
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DISABLE_COPY_AND_ASSIGN (scoped_btrace_disable);
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~scoped_btrace_disable ()
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{
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for (thread_info *tp : m_threads)
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btrace_disable (tp);
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}
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void add_thread (thread_info *thread)
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{
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m_threads.push_front (thread);
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}
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void discard ()
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{
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m_threads.clear ();
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}
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private:
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std::forward_list<thread_info *> m_threads;
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};
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/* Open target record-btrace. */
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static void
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record_btrace_target_open (const char *args, int from_tty)
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{
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/* If we fail to enable btrace for one thread, disable it for the threads for
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which it was successfully enabled. */
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scoped_btrace_disable btrace_disable;
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DEBUG ("open");
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record_preopen ();
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if (!target_has_execution)
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error (_("The program is not being run."));
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for (thread_info *tp : all_non_exited_threads ())
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if (args == NULL || *args == 0 || number_is_in_list (args, tp->global_num))
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{
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btrace_enable (tp, &record_btrace_conf);
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btrace_disable.add_thread (tp);
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}
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record_btrace_push_target ();
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btrace_disable.discard ();
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}
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/* The stop_recording method of target record-btrace. */
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void
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record_btrace_target::stop_recording ()
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{
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DEBUG ("stop recording");
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record_btrace_auto_disable ();
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for (thread_info *tp : all_non_exited_threads ())
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if (tp->btrace.target != NULL)
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btrace_disable (tp);
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}
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/* The disconnect method of target record-btrace. */
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void
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record_btrace_target::disconnect (const char *args,
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int from_tty)
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{
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struct target_ops *beneath = this->beneath ();
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/* Do not stop recording, just clean up GDB side. */
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unpush_target (this);
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/* Forward disconnect. */
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beneath->disconnect (args, from_tty);
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}
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/* The close method of target record-btrace. */
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void
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record_btrace_target::close ()
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{
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if (record_btrace_async_inferior_event_handler != NULL)
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delete_async_event_handler (&record_btrace_async_inferior_event_handler);
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|
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/* Make sure automatic recording gets disabled even if we did not stop
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recording before closing the record-btrace target. */
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record_btrace_auto_disable ();
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|
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/* We should have already stopped recording.
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Tear down btrace in case we have not. */
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for (thread_info *tp : all_non_exited_threads ())
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btrace_teardown (tp);
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}
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|
|
|
/* The async method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::async (int enable)
|
|
{
|
|
if (enable)
|
|
mark_async_event_handler (record_btrace_async_inferior_event_handler);
|
|
else
|
|
clear_async_event_handler (record_btrace_async_inferior_event_handler);
|
|
|
|
this->beneath ()->async (enable);
|
|
}
|
|
|
|
/* Adjusts the size and returns a human readable size suffix. */
|
|
|
|
static const char *
|
|
record_btrace_adjust_size (unsigned int *size)
|
|
{
|
|
unsigned int sz;
|
|
|
|
sz = *size;
|
|
|
|
if ((sz & ((1u << 30) - 1)) == 0)
|
|
{
|
|
*size = sz >> 30;
|
|
return "GB";
|
|
}
|
|
else if ((sz & ((1u << 20) - 1)) == 0)
|
|
{
|
|
*size = sz >> 20;
|
|
return "MB";
|
|
}
|
|
else if ((sz & ((1u << 10) - 1)) == 0)
|
|
{
|
|
*size = sz >> 10;
|
|
return "kB";
|
|
}
|
|
else
|
|
return "";
|
|
}
|
|
|
|
/* Print a BTS configuration. */
|
|
|
|
static void
|
|
record_btrace_print_bts_conf (const struct btrace_config_bts *conf)
|
|
{
|
|
const char *suffix;
|
|
unsigned int size;
|
|
|
|
size = conf->size;
|
|
if (size > 0)
|
|
{
|
|
suffix = record_btrace_adjust_size (&size);
|
|
printf_unfiltered (_("Buffer size: %u%s.\n"), size, suffix);
|
|
}
|
|
}
|
|
|
|
/* Print an Intel Processor Trace configuration. */
|
|
|
|
static void
|
|
record_btrace_print_pt_conf (const struct btrace_config_pt *conf)
|
|
{
|
|
const char *suffix;
|
|
unsigned int size;
|
|
|
|
size = conf->size;
|
|
if (size > 0)
|
|
{
|
|
suffix = record_btrace_adjust_size (&size);
|
|
printf_unfiltered (_("Buffer size: %u%s.\n"), size, suffix);
|
|
}
|
|
}
|
|
|
|
/* Print a branch tracing configuration. */
|
|
|
|
static void
|
|
record_btrace_print_conf (const struct btrace_config *conf)
|
|
{
|
|
printf_unfiltered (_("Recording format: %s.\n"),
|
|
btrace_format_string (conf->format));
|
|
|
|
switch (conf->format)
|
|
{
|
|
case BTRACE_FORMAT_NONE:
|
|
return;
|
|
|
|
case BTRACE_FORMAT_BTS:
|
|
record_btrace_print_bts_conf (&conf->bts);
|
|
return;
|
|
|
|
case BTRACE_FORMAT_PT:
|
|
record_btrace_print_pt_conf (&conf->pt);
|
|
return;
|
|
}
|
|
|
|
internal_error (__FILE__, __LINE__, _("Unkown branch trace format."));
|
|
}
|
|
|
|
/* The info_record method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::info_record ()
|
|
{
|
|
struct btrace_thread_info *btinfo;
|
|
const struct btrace_config *conf;
|
|
struct thread_info *tp;
|
|
unsigned int insns, calls, gaps;
|
|
|
|
DEBUG ("info");
|
|
|
|
if (inferior_ptid == null_ptid)
|
|
error (_("No thread."));
|
|
|
|
tp = inferior_thread ();
|
|
|
|
validate_registers_access ();
|
|
|
|
btinfo = &tp->btrace;
|
|
|
|
conf = ::btrace_conf (btinfo);
|
|
if (conf != NULL)
|
|
record_btrace_print_conf (conf);
|
|
|
|
btrace_fetch (tp, record_btrace_get_cpu ());
|
|
|
|
insns = 0;
|
|
calls = 0;
|
|
gaps = 0;
|
|
|
|
if (!btrace_is_empty (tp))
|
|
{
|
|
struct btrace_call_iterator call;
|
|
struct btrace_insn_iterator insn;
|
|
|
|
btrace_call_end (&call, btinfo);
|
|
btrace_call_prev (&call, 1);
|
|
calls = btrace_call_number (&call);
|
|
|
|
btrace_insn_end (&insn, btinfo);
|
|
insns = btrace_insn_number (&insn);
|
|
|
|
/* If the last instruction is not a gap, it is the current instruction
|
|
that is not actually part of the record. */
|
|
if (btrace_insn_get (&insn) != NULL)
|
|
insns -= 1;
|
|
|
|
gaps = btinfo->ngaps;
|
|
}
|
|
|
|
printf_unfiltered (_("Recorded %u instructions in %u functions (%u gaps) "
|
|
"for thread %s (%s).\n"), insns, calls, gaps,
|
|
print_thread_id (tp),
|
|
target_pid_to_str (tp->ptid).c_str ());
|
|
|
|
if (btrace_is_replaying (tp))
|
|
printf_unfiltered (_("Replay in progress. At instruction %u.\n"),
|
|
btrace_insn_number (btinfo->replay));
|
|
}
|
|
|
|
/* Print a decode error. */
|
|
|
|
static void
|
|
btrace_ui_out_decode_error (struct ui_out *uiout, int errcode,
|
|
enum btrace_format format)
|
|
{
|
|
const char *errstr = btrace_decode_error (format, errcode);
|
|
|
|
uiout->text (_("["));
|
|
/* ERRCODE > 0 indicates notifications on BTRACE_FORMAT_PT. */
|
|
if (!(format == BTRACE_FORMAT_PT && errcode > 0))
|
|
{
|
|
uiout->text (_("decode error ("));
|
|
uiout->field_signed ("errcode", errcode);
|
|
uiout->text (_("): "));
|
|
}
|
|
uiout->text (errstr);
|
|
uiout->text (_("]\n"));
|
|
}
|
|
|
|
/* A range of source lines. */
|
|
|
|
struct btrace_line_range
|
|
{
|
|
/* The symtab this line is from. */
|
|
struct symtab *symtab;
|
|
|
|
/* The first line (inclusive). */
|
|
int begin;
|
|
|
|
/* The last line (exclusive). */
|
|
int end;
|
|
};
|
|
|
|
/* Construct a line range. */
|
|
|
|
static struct btrace_line_range
|
|
btrace_mk_line_range (struct symtab *symtab, int begin, int end)
|
|
{
|
|
struct btrace_line_range range;
|
|
|
|
range.symtab = symtab;
|
|
range.begin = begin;
|
|
range.end = end;
|
|
|
|
return range;
|
|
}
|
|
|
|
/* Add a line to a line range. */
|
|
|
|
static struct btrace_line_range
|
|
btrace_line_range_add (struct btrace_line_range range, int line)
|
|
{
|
|
if (range.end <= range.begin)
|
|
{
|
|
/* This is the first entry. */
|
|
range.begin = line;
|
|
range.end = line + 1;
|
|
}
|
|
else if (line < range.begin)
|
|
range.begin = line;
|
|
else if (range.end < line)
|
|
range.end = line;
|
|
|
|
return range;
|
|
}
|
|
|
|
/* Return non-zero if RANGE is empty, zero otherwise. */
|
|
|
|
static int
|
|
btrace_line_range_is_empty (struct btrace_line_range range)
|
|
{
|
|
return range.end <= range.begin;
|
|
}
|
|
|
|
/* Return non-zero if LHS contains RHS, zero otherwise. */
|
|
|
|
static int
|
|
btrace_line_range_contains_range (struct btrace_line_range lhs,
|
|
struct btrace_line_range rhs)
|
|
{
|
|
return ((lhs.symtab == rhs.symtab)
|
|
&& (lhs.begin <= rhs.begin)
|
|
&& (rhs.end <= lhs.end));
|
|
}
|
|
|
|
/* Find the line range associated with PC. */
|
|
|
|
static struct btrace_line_range
|
|
btrace_find_line_range (CORE_ADDR pc)
|
|
{
|
|
struct btrace_line_range range;
|
|
struct linetable_entry *lines;
|
|
struct linetable *ltable;
|
|
struct symtab *symtab;
|
|
int nlines, i;
|
|
|
|
symtab = find_pc_line_symtab (pc);
|
|
if (symtab == NULL)
|
|
return btrace_mk_line_range (NULL, 0, 0);
|
|
|
|
ltable = SYMTAB_LINETABLE (symtab);
|
|
if (ltable == NULL)
|
|
return btrace_mk_line_range (symtab, 0, 0);
|
|
|
|
nlines = ltable->nitems;
|
|
lines = ltable->item;
|
|
if (nlines <= 0)
|
|
return btrace_mk_line_range (symtab, 0, 0);
|
|
|
|
range = btrace_mk_line_range (symtab, 0, 0);
|
|
for (i = 0; i < nlines - 1; i++)
|
|
{
|
|
if ((lines[i].pc == pc) && (lines[i].line != 0))
|
|
range = btrace_line_range_add (range, lines[i].line);
|
|
}
|
|
|
|
return range;
|
|
}
|
|
|
|
/* Print source lines in LINES to UIOUT.
|
|
|
|
UI_ITEM_CHAIN is a cleanup chain for the last source line and the
|
|
instructions corresponding to that source line. When printing a new source
|
|
line, we do the cleanups for the open chain and open a new cleanup chain for
|
|
the new source line. If the source line range in LINES is not empty, this
|
|
function will leave the cleanup chain for the last printed source line open
|
|
so instructions can be added to it. */
|
|
|
|
static void
|
|
btrace_print_lines (struct btrace_line_range lines, struct ui_out *uiout,
|
|
gdb::optional<ui_out_emit_tuple> *src_and_asm_tuple,
|
|
gdb::optional<ui_out_emit_list> *asm_list,
|
|
gdb_disassembly_flags flags)
|
|
{
|
|
print_source_lines_flags psl_flags;
|
|
|
|
if (flags & DISASSEMBLY_FILENAME)
|
|
psl_flags |= PRINT_SOURCE_LINES_FILENAME;
|
|
|
|
for (int line = lines.begin; line < lines.end; ++line)
|
|
{
|
|
asm_list->reset ();
|
|
|
|
src_and_asm_tuple->emplace (uiout, "src_and_asm_line");
|
|
|
|
print_source_lines (lines.symtab, line, line + 1, psl_flags);
|
|
|
|
asm_list->emplace (uiout, "line_asm_insn");
|
|
}
|
|
}
|
|
|
|
/* Disassemble a section of the recorded instruction trace. */
|
|
|
|
static void
|
|
btrace_insn_history (struct ui_out *uiout,
|
|
const struct btrace_thread_info *btinfo,
|
|
const struct btrace_insn_iterator *begin,
|
|
const struct btrace_insn_iterator *end,
|
|
gdb_disassembly_flags flags)
|
|
{
|
|
DEBUG ("itrace (0x%x): [%u; %u)", (unsigned) flags,
|
|
btrace_insn_number (begin), btrace_insn_number (end));
|
|
|
|
flags |= DISASSEMBLY_SPECULATIVE;
|
|
|
|
struct gdbarch *gdbarch = target_gdbarch ();
|
|
btrace_line_range last_lines = btrace_mk_line_range (NULL, 0, 0);
|
|
|
|
ui_out_emit_list list_emitter (uiout, "asm_insns");
|
|
|
|
gdb::optional<ui_out_emit_tuple> src_and_asm_tuple;
|
|
gdb::optional<ui_out_emit_list> asm_list;
|
|
|
|
gdb_pretty_print_disassembler disasm (gdbarch, uiout);
|
|
|
|
for (btrace_insn_iterator it = *begin; btrace_insn_cmp (&it, end) != 0;
|
|
btrace_insn_next (&it, 1))
|
|
{
|
|
const struct btrace_insn *insn;
|
|
|
|
insn = btrace_insn_get (&it);
|
|
|
|
/* A NULL instruction indicates a gap in the trace. */
|
|
if (insn == NULL)
|
|
{
|
|
const struct btrace_config *conf;
|
|
|
|
conf = btrace_conf (btinfo);
|
|
|
|
/* We have trace so we must have a configuration. */
|
|
gdb_assert (conf != NULL);
|
|
|
|
uiout->field_fmt ("insn-number", "%u",
|
|
btrace_insn_number (&it));
|
|
uiout->text ("\t");
|
|
|
|
btrace_ui_out_decode_error (uiout, btrace_insn_get_error (&it),
|
|
conf->format);
|
|
}
|
|
else
|
|
{
|
|
struct disasm_insn dinsn;
|
|
|
|
if ((flags & DISASSEMBLY_SOURCE) != 0)
|
|
{
|
|
struct btrace_line_range lines;
|
|
|
|
lines = btrace_find_line_range (insn->pc);
|
|
if (!btrace_line_range_is_empty (lines)
|
|
&& !btrace_line_range_contains_range (last_lines, lines))
|
|
{
|
|
btrace_print_lines (lines, uiout, &src_and_asm_tuple, &asm_list,
|
|
flags);
|
|
last_lines = lines;
|
|
}
|
|
else if (!src_and_asm_tuple.has_value ())
|
|
{
|
|
gdb_assert (!asm_list.has_value ());
|
|
|
|
src_and_asm_tuple.emplace (uiout, "src_and_asm_line");
|
|
|
|
/* No source information. */
|
|
asm_list.emplace (uiout, "line_asm_insn");
|
|
}
|
|
|
|
gdb_assert (src_and_asm_tuple.has_value ());
|
|
gdb_assert (asm_list.has_value ());
|
|
}
|
|
|
|
memset (&dinsn, 0, sizeof (dinsn));
|
|
dinsn.number = btrace_insn_number (&it);
|
|
dinsn.addr = insn->pc;
|
|
|
|
if ((insn->flags & BTRACE_INSN_FLAG_SPECULATIVE) != 0)
|
|
dinsn.is_speculative = 1;
|
|
|
|
disasm.pretty_print_insn (&dinsn, flags);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* The insn_history method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::insn_history (int size, gdb_disassembly_flags flags)
|
|
{
|
|
struct btrace_thread_info *btinfo;
|
|
struct btrace_insn_history *history;
|
|
struct btrace_insn_iterator begin, end;
|
|
struct ui_out *uiout;
|
|
unsigned int context, covered;
|
|
|
|
uiout = current_uiout;
|
|
ui_out_emit_tuple tuple_emitter (uiout, "insn history");
|
|
context = abs (size);
|
|
if (context == 0)
|
|
error (_("Bad record instruction-history-size."));
|
|
|
|
btinfo = require_btrace ();
|
|
history = btinfo->insn_history;
|
|
if (history == NULL)
|
|
{
|
|
struct btrace_insn_iterator *replay;
|
|
|
|
DEBUG ("insn-history (0x%x): %d", (unsigned) flags, size);
|
|
|
|
/* If we're replaying, we start at the replay position. Otherwise, we
|
|
start at the tail of the trace. */
|
|
replay = btinfo->replay;
|
|
if (replay != NULL)
|
|
begin = *replay;
|
|
else
|
|
btrace_insn_end (&begin, btinfo);
|
|
|
|
/* We start from here and expand in the requested direction. Then we
|
|
expand in the other direction, as well, to fill up any remaining
|
|
context. */
|
|
end = begin;
|
|
if (size < 0)
|
|
{
|
|
/* We want the current position covered, as well. */
|
|
covered = btrace_insn_next (&end, 1);
|
|
covered += btrace_insn_prev (&begin, context - covered);
|
|
covered += btrace_insn_next (&end, context - covered);
|
|
}
|
|
else
|
|
{
|
|
covered = btrace_insn_next (&end, context);
|
|
covered += btrace_insn_prev (&begin, context - covered);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
begin = history->begin;
|
|
end = history->end;
|
|
|
|
DEBUG ("insn-history (0x%x): %d, prev: [%u; %u)", (unsigned) flags, size,
|
|
btrace_insn_number (&begin), btrace_insn_number (&end));
|
|
|
|
if (size < 0)
|
|
{
|
|
end = begin;
|
|
covered = btrace_insn_prev (&begin, context);
|
|
}
|
|
else
|
|
{
|
|
begin = end;
|
|
covered = btrace_insn_next (&end, context);
|
|
}
|
|
}
|
|
|
|
if (covered > 0)
|
|
btrace_insn_history (uiout, btinfo, &begin, &end, flags);
|
|
else
|
|
{
|
|
if (size < 0)
|
|
printf_unfiltered (_("At the start of the branch trace record.\n"));
|
|
else
|
|
printf_unfiltered (_("At the end of the branch trace record.\n"));
|
|
}
|
|
|
|
btrace_set_insn_history (btinfo, &begin, &end);
|
|
}
|
|
|
|
/* The insn_history_range method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::insn_history_range (ULONGEST from, ULONGEST to,
|
|
gdb_disassembly_flags flags)
|
|
{
|
|
struct btrace_thread_info *btinfo;
|
|
struct btrace_insn_iterator begin, end;
|
|
struct ui_out *uiout;
|
|
unsigned int low, high;
|
|
int found;
|
|
|
|
uiout = current_uiout;
|
|
ui_out_emit_tuple tuple_emitter (uiout, "insn history");
|
|
low = from;
|
|
high = to;
|
|
|
|
DEBUG ("insn-history (0x%x): [%u; %u)", (unsigned) flags, low, high);
|
|
|
|
/* Check for wrap-arounds. */
|
|
if (low != from || high != to)
|
|
error (_("Bad range."));
|
|
|
|
if (high < low)
|
|
error (_("Bad range."));
|
|
|
|
btinfo = require_btrace ();
|
|
|
|
found = btrace_find_insn_by_number (&begin, btinfo, low);
|
|
if (found == 0)
|
|
error (_("Range out of bounds."));
|
|
|
|
found = btrace_find_insn_by_number (&end, btinfo, high);
|
|
if (found == 0)
|
|
{
|
|
/* Silently truncate the range. */
|
|
btrace_insn_end (&end, btinfo);
|
|
}
|
|
else
|
|
{
|
|
/* We want both begin and end to be inclusive. */
|
|
btrace_insn_next (&end, 1);
|
|
}
|
|
|
|
btrace_insn_history (uiout, btinfo, &begin, &end, flags);
|
|
btrace_set_insn_history (btinfo, &begin, &end);
|
|
}
|
|
|
|
/* The insn_history_from method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::insn_history_from (ULONGEST from, int size,
|
|
gdb_disassembly_flags flags)
|
|
{
|
|
ULONGEST begin, end, context;
|
|
|
|
context = abs (size);
|
|
if (context == 0)
|
|
error (_("Bad record instruction-history-size."));
|
|
|
|
if (size < 0)
|
|
{
|
|
end = from;
|
|
|
|
if (from < context)
|
|
begin = 0;
|
|
else
|
|
begin = from - context + 1;
|
|
}
|
|
else
|
|
{
|
|
begin = from;
|
|
end = from + context - 1;
|
|
|
|
/* Check for wrap-around. */
|
|
if (end < begin)
|
|
end = ULONGEST_MAX;
|
|
}
|
|
|
|
insn_history_range (begin, end, flags);
|
|
}
|
|
|
|
/* Print the instruction number range for a function call history line. */
|
|
|
|
static void
|
|
btrace_call_history_insn_range (struct ui_out *uiout,
|
|
const struct btrace_function *bfun)
|
|
{
|
|
unsigned int begin, end, size;
|
|
|
|
size = bfun->insn.size ();
|
|
gdb_assert (size > 0);
|
|
|
|
begin = bfun->insn_offset;
|
|
end = begin + size - 1;
|
|
|
|
uiout->field_unsigned ("insn begin", begin);
|
|
uiout->text (",");
|
|
uiout->field_unsigned ("insn end", end);
|
|
}
|
|
|
|
/* Compute the lowest and highest source line for the instructions in BFUN
|
|
and return them in PBEGIN and PEND.
|
|
Ignore instructions that can't be mapped to BFUN, e.g. instructions that
|
|
result from inlining or macro expansion. */
|
|
|
|
static void
|
|
btrace_compute_src_line_range (const struct btrace_function *bfun,
|
|
int *pbegin, int *pend)
|
|
{
|
|
struct symtab *symtab;
|
|
struct symbol *sym;
|
|
int begin, end;
|
|
|
|
begin = INT_MAX;
|
|
end = INT_MIN;
|
|
|
|
sym = bfun->sym;
|
|
if (sym == NULL)
|
|
goto out;
|
|
|
|
symtab = symbol_symtab (sym);
|
|
|
|
for (const btrace_insn &insn : bfun->insn)
|
|
{
|
|
struct symtab_and_line sal;
|
|
|
|
sal = find_pc_line (insn.pc, 0);
|
|
if (sal.symtab != symtab || sal.line == 0)
|
|
continue;
|
|
|
|
begin = std::min (begin, sal.line);
|
|
end = std::max (end, sal.line);
|
|
}
|
|
|
|
out:
|
|
*pbegin = begin;
|
|
*pend = end;
|
|
}
|
|
|
|
/* Print the source line information for a function call history line. */
|
|
|
|
static void
|
|
btrace_call_history_src_line (struct ui_out *uiout,
|
|
const struct btrace_function *bfun)
|
|
{
|
|
struct symbol *sym;
|
|
int begin, end;
|
|
|
|
sym = bfun->sym;
|
|
if (sym == NULL)
|
|
return;
|
|
|
|
uiout->field_string ("file",
|
|
symtab_to_filename_for_display (symbol_symtab (sym)),
|
|
file_name_style.style ());
|
|
|
|
btrace_compute_src_line_range (bfun, &begin, &end);
|
|
if (end < begin)
|
|
return;
|
|
|
|
uiout->text (":");
|
|
uiout->field_signed ("min line", begin);
|
|
|
|
if (end == begin)
|
|
return;
|
|
|
|
uiout->text (",");
|
|
uiout->field_signed ("max line", end);
|
|
}
|
|
|
|
/* Get the name of a branch trace function. */
|
|
|
|
static const char *
|
|
btrace_get_bfun_name (const struct btrace_function *bfun)
|
|
{
|
|
struct minimal_symbol *msym;
|
|
struct symbol *sym;
|
|
|
|
if (bfun == NULL)
|
|
return "??";
|
|
|
|
msym = bfun->msym;
|
|
sym = bfun->sym;
|
|
|
|
if (sym != NULL)
|
|
return sym->print_name ();
|
|
else if (msym != NULL)
|
|
return msym->print_name ();
|
|
else
|
|
return "??";
|
|
}
|
|
|
|
/* Disassemble a section of the recorded function trace. */
|
|
|
|
static void
|
|
btrace_call_history (struct ui_out *uiout,
|
|
const struct btrace_thread_info *btinfo,
|
|
const struct btrace_call_iterator *begin,
|
|
const struct btrace_call_iterator *end,
|
|
int int_flags)
|
|
{
|
|
struct btrace_call_iterator it;
|
|
record_print_flags flags = (enum record_print_flag) int_flags;
|
|
|
|
DEBUG ("ftrace (0x%x): [%u; %u)", int_flags, btrace_call_number (begin),
|
|
btrace_call_number (end));
|
|
|
|
for (it = *begin; btrace_call_cmp (&it, end) < 0; btrace_call_next (&it, 1))
|
|
{
|
|
const struct btrace_function *bfun;
|
|
struct minimal_symbol *msym;
|
|
struct symbol *sym;
|
|
|
|
bfun = btrace_call_get (&it);
|
|
sym = bfun->sym;
|
|
msym = bfun->msym;
|
|
|
|
/* Print the function index. */
|
|
uiout->field_unsigned ("index", bfun->number);
|
|
uiout->text ("\t");
|
|
|
|
/* Indicate gaps in the trace. */
|
|
if (bfun->errcode != 0)
|
|
{
|
|
const struct btrace_config *conf;
|
|
|
|
conf = btrace_conf (btinfo);
|
|
|
|
/* We have trace so we must have a configuration. */
|
|
gdb_assert (conf != NULL);
|
|
|
|
btrace_ui_out_decode_error (uiout, bfun->errcode, conf->format);
|
|
|
|
continue;
|
|
}
|
|
|
|
if ((flags & RECORD_PRINT_INDENT_CALLS) != 0)
|
|
{
|
|
int level = bfun->level + btinfo->level, i;
|
|
|
|
for (i = 0; i < level; ++i)
|
|
uiout->text (" ");
|
|
}
|
|
|
|
if (sym != NULL)
|
|
uiout->field_string ("function", sym->print_name (),
|
|
function_name_style.style ());
|
|
else if (msym != NULL)
|
|
uiout->field_string ("function", msym->print_name (),
|
|
function_name_style.style ());
|
|
else if (!uiout->is_mi_like_p ())
|
|
uiout->field_string ("function", "??",
|
|
function_name_style.style ());
|
|
|
|
if ((flags & RECORD_PRINT_INSN_RANGE) != 0)
|
|
{
|
|
uiout->text (_("\tinst "));
|
|
btrace_call_history_insn_range (uiout, bfun);
|
|
}
|
|
|
|
if ((flags & RECORD_PRINT_SRC_LINE) != 0)
|
|
{
|
|
uiout->text (_("\tat "));
|
|
btrace_call_history_src_line (uiout, bfun);
|
|
}
|
|
|
|
uiout->text ("\n");
|
|
}
|
|
}
|
|
|
|
/* The call_history method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::call_history (int size, record_print_flags flags)
|
|
{
|
|
struct btrace_thread_info *btinfo;
|
|
struct btrace_call_history *history;
|
|
struct btrace_call_iterator begin, end;
|
|
struct ui_out *uiout;
|
|
unsigned int context, covered;
|
|
|
|
uiout = current_uiout;
|
|
ui_out_emit_tuple tuple_emitter (uiout, "insn history");
|
|
context = abs (size);
|
|
if (context == 0)
|
|
error (_("Bad record function-call-history-size."));
|
|
|
|
btinfo = require_btrace ();
|
|
history = btinfo->call_history;
|
|
if (history == NULL)
|
|
{
|
|
struct btrace_insn_iterator *replay;
|
|
|
|
DEBUG ("call-history (0x%x): %d", (int) flags, size);
|
|
|
|
/* If we're replaying, we start at the replay position. Otherwise, we
|
|
start at the tail of the trace. */
|
|
replay = btinfo->replay;
|
|
if (replay != NULL)
|
|
{
|
|
begin.btinfo = btinfo;
|
|
begin.index = replay->call_index;
|
|
}
|
|
else
|
|
btrace_call_end (&begin, btinfo);
|
|
|
|
/* We start from here and expand in the requested direction. Then we
|
|
expand in the other direction, as well, to fill up any remaining
|
|
context. */
|
|
end = begin;
|
|
if (size < 0)
|
|
{
|
|
/* We want the current position covered, as well. */
|
|
covered = btrace_call_next (&end, 1);
|
|
covered += btrace_call_prev (&begin, context - covered);
|
|
covered += btrace_call_next (&end, context - covered);
|
|
}
|
|
else
|
|
{
|
|
covered = btrace_call_next (&end, context);
|
|
covered += btrace_call_prev (&begin, context- covered);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
begin = history->begin;
|
|
end = history->end;
|
|
|
|
DEBUG ("call-history (0x%x): %d, prev: [%u; %u)", (int) flags, size,
|
|
btrace_call_number (&begin), btrace_call_number (&end));
|
|
|
|
if (size < 0)
|
|
{
|
|
end = begin;
|
|
covered = btrace_call_prev (&begin, context);
|
|
}
|
|
else
|
|
{
|
|
begin = end;
|
|
covered = btrace_call_next (&end, context);
|
|
}
|
|
}
|
|
|
|
if (covered > 0)
|
|
btrace_call_history (uiout, btinfo, &begin, &end, flags);
|
|
else
|
|
{
|
|
if (size < 0)
|
|
printf_unfiltered (_("At the start of the branch trace record.\n"));
|
|
else
|
|
printf_unfiltered (_("At the end of the branch trace record.\n"));
|
|
}
|
|
|
|
btrace_set_call_history (btinfo, &begin, &end);
|
|
}
|
|
|
|
/* The call_history_range method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::call_history_range (ULONGEST from, ULONGEST to,
|
|
record_print_flags flags)
|
|
{
|
|
struct btrace_thread_info *btinfo;
|
|
struct btrace_call_iterator begin, end;
|
|
struct ui_out *uiout;
|
|
unsigned int low, high;
|
|
int found;
|
|
|
|
uiout = current_uiout;
|
|
ui_out_emit_tuple tuple_emitter (uiout, "func history");
|
|
low = from;
|
|
high = to;
|
|
|
|
DEBUG ("call-history (0x%x): [%u; %u)", (int) flags, low, high);
|
|
|
|
/* Check for wrap-arounds. */
|
|
if (low != from || high != to)
|
|
error (_("Bad range."));
|
|
|
|
if (high < low)
|
|
error (_("Bad range."));
|
|
|
|
btinfo = require_btrace ();
|
|
|
|
found = btrace_find_call_by_number (&begin, btinfo, low);
|
|
if (found == 0)
|
|
error (_("Range out of bounds."));
|
|
|
|
found = btrace_find_call_by_number (&end, btinfo, high);
|
|
if (found == 0)
|
|
{
|
|
/* Silently truncate the range. */
|
|
btrace_call_end (&end, btinfo);
|
|
}
|
|
else
|
|
{
|
|
/* We want both begin and end to be inclusive. */
|
|
btrace_call_next (&end, 1);
|
|
}
|
|
|
|
btrace_call_history (uiout, btinfo, &begin, &end, flags);
|
|
btrace_set_call_history (btinfo, &begin, &end);
|
|
}
|
|
|
|
/* The call_history_from method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::call_history_from (ULONGEST from, int size,
|
|
record_print_flags flags)
|
|
{
|
|
ULONGEST begin, end, context;
|
|
|
|
context = abs (size);
|
|
if (context == 0)
|
|
error (_("Bad record function-call-history-size."));
|
|
|
|
if (size < 0)
|
|
{
|
|
end = from;
|
|
|
|
if (from < context)
|
|
begin = 0;
|
|
else
|
|
begin = from - context + 1;
|
|
}
|
|
else
|
|
{
|
|
begin = from;
|
|
end = from + context - 1;
|
|
|
|
/* Check for wrap-around. */
|
|
if (end < begin)
|
|
end = ULONGEST_MAX;
|
|
}
|
|
|
|
call_history_range ( begin, end, flags);
|
|
}
|
|
|
|
/* The record_method method of target record-btrace. */
|
|
|
|
enum record_method
|
|
record_btrace_target::record_method (ptid_t ptid)
|
|
{
|
|
process_stratum_target *proc_target = current_inferior ()->process_target ();
|
|
thread_info *const tp = find_thread_ptid (proc_target, ptid);
|
|
|
|
if (tp == NULL)
|
|
error (_("No thread."));
|
|
|
|
if (tp->btrace.target == NULL)
|
|
return RECORD_METHOD_NONE;
|
|
|
|
return RECORD_METHOD_BTRACE;
|
|
}
|
|
|
|
/* The record_is_replaying method of target record-btrace. */
|
|
|
|
bool
|
|
record_btrace_target::record_is_replaying (ptid_t ptid)
|
|
{
|
|
process_stratum_target *proc_target = current_inferior ()->process_target ();
|
|
for (thread_info *tp : all_non_exited_threads (proc_target, ptid))
|
|
if (btrace_is_replaying (tp))
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
/* The record_will_replay method of target record-btrace. */
|
|
|
|
bool
|
|
record_btrace_target::record_will_replay (ptid_t ptid, int dir)
|
|
{
|
|
return dir == EXEC_REVERSE || record_is_replaying (ptid);
|
|
}
|
|
|
|
/* The xfer_partial method of target record-btrace. */
|
|
|
|
enum target_xfer_status
|
|
record_btrace_target::xfer_partial (enum target_object object,
|
|
const char *annex, gdb_byte *readbuf,
|
|
const gdb_byte *writebuf, ULONGEST offset,
|
|
ULONGEST len, ULONGEST *xfered_len)
|
|
{
|
|
/* Filter out requests that don't make sense during replay. */
|
|
if (replay_memory_access == replay_memory_access_read_only
|
|
&& !record_btrace_generating_corefile
|
|
&& record_is_replaying (inferior_ptid))
|
|
{
|
|
switch (object)
|
|
{
|
|
case TARGET_OBJECT_MEMORY:
|
|
{
|
|
struct target_section *section;
|
|
|
|
/* We do not allow writing memory in general. */
|
|
if (writebuf != NULL)
|
|
{
|
|
*xfered_len = len;
|
|
return TARGET_XFER_UNAVAILABLE;
|
|
}
|
|
|
|
/* We allow reading readonly memory. */
|
|
section = target_section_by_addr (this, offset);
|
|
if (section != NULL)
|
|
{
|
|
/* Check if the section we found is readonly. */
|
|
if ((bfd_section_flags (section->the_bfd_section)
|
|
& SEC_READONLY) != 0)
|
|
{
|
|
/* Truncate the request to fit into this section. */
|
|
len = std::min (len, section->endaddr - offset);
|
|
break;
|
|
}
|
|
}
|
|
|
|
*xfered_len = len;
|
|
return TARGET_XFER_UNAVAILABLE;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Forward the request. */
|
|
return this->beneath ()->xfer_partial (object, annex, readbuf, writebuf,
|
|
offset, len, xfered_len);
|
|
}
|
|
|
|
/* The insert_breakpoint method of target record-btrace. */
|
|
|
|
int
|
|
record_btrace_target::insert_breakpoint (struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt)
|
|
{
|
|
const char *old;
|
|
int ret;
|
|
|
|
/* Inserting breakpoints requires accessing memory. Allow it for the
|
|
duration of this function. */
|
|
old = replay_memory_access;
|
|
replay_memory_access = replay_memory_access_read_write;
|
|
|
|
ret = 0;
|
|
try
|
|
{
|
|
ret = this->beneath ()->insert_breakpoint (gdbarch, bp_tgt);
|
|
}
|
|
catch (const gdb_exception &except)
|
|
{
|
|
replay_memory_access = old;
|
|
throw;
|
|
}
|
|
replay_memory_access = old;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* The remove_breakpoint method of target record-btrace. */
|
|
|
|
int
|
|
record_btrace_target::remove_breakpoint (struct gdbarch *gdbarch,
|
|
struct bp_target_info *bp_tgt,
|
|
enum remove_bp_reason reason)
|
|
{
|
|
const char *old;
|
|
int ret;
|
|
|
|
/* Removing breakpoints requires accessing memory. Allow it for the
|
|
duration of this function. */
|
|
old = replay_memory_access;
|
|
replay_memory_access = replay_memory_access_read_write;
|
|
|
|
ret = 0;
|
|
try
|
|
{
|
|
ret = this->beneath ()->remove_breakpoint (gdbarch, bp_tgt, reason);
|
|
}
|
|
catch (const gdb_exception &except)
|
|
{
|
|
replay_memory_access = old;
|
|
throw;
|
|
}
|
|
replay_memory_access = old;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* The fetch_registers method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::fetch_registers (struct regcache *regcache, int regno)
|
|
{
|
|
thread_info *tp = find_thread_ptid (regcache->target (), regcache->ptid ());
|
|
gdb_assert (tp != NULL);
|
|
|
|
btrace_insn_iterator *replay = tp->btrace.replay;
|
|
if (replay != NULL && !record_btrace_generating_corefile)
|
|
{
|
|
const struct btrace_insn *insn;
|
|
struct gdbarch *gdbarch;
|
|
int pcreg;
|
|
|
|
gdbarch = regcache->arch ();
|
|
pcreg = gdbarch_pc_regnum (gdbarch);
|
|
if (pcreg < 0)
|
|
return;
|
|
|
|
/* We can only provide the PC register. */
|
|
if (regno >= 0 && regno != pcreg)
|
|
return;
|
|
|
|
insn = btrace_insn_get (replay);
|
|
gdb_assert (insn != NULL);
|
|
|
|
regcache->raw_supply (regno, &insn->pc);
|
|
}
|
|
else
|
|
this->beneath ()->fetch_registers (regcache, regno);
|
|
}
|
|
|
|
/* The store_registers method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::store_registers (struct regcache *regcache, int regno)
|
|
{
|
|
if (!record_btrace_generating_corefile
|
|
&& record_is_replaying (regcache->ptid ()))
|
|
error (_("Cannot write registers while replaying."));
|
|
|
|
gdb_assert (may_write_registers);
|
|
|
|
this->beneath ()->store_registers (regcache, regno);
|
|
}
|
|
|
|
/* The prepare_to_store method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::prepare_to_store (struct regcache *regcache)
|
|
{
|
|
if (!record_btrace_generating_corefile
|
|
&& record_is_replaying (regcache->ptid ()))
|
|
return;
|
|
|
|
this->beneath ()->prepare_to_store (regcache);
|
|
}
|
|
|
|
/* The branch trace frame cache. */
|
|
|
|
struct btrace_frame_cache
|
|
{
|
|
/* The thread. */
|
|
struct thread_info *tp;
|
|
|
|
/* The frame info. */
|
|
struct frame_info *frame;
|
|
|
|
/* The branch trace function segment. */
|
|
const struct btrace_function *bfun;
|
|
};
|
|
|
|
/* A struct btrace_frame_cache hash table indexed by NEXT. */
|
|
|
|
static htab_t bfcache;
|
|
|
|
/* hash_f for htab_create_alloc of bfcache. */
|
|
|
|
static hashval_t
|
|
bfcache_hash (const void *arg)
|
|
{
|
|
const struct btrace_frame_cache *cache
|
|
= (const struct btrace_frame_cache *) arg;
|
|
|
|
return htab_hash_pointer (cache->frame);
|
|
}
|
|
|
|
/* eq_f for htab_create_alloc of bfcache. */
|
|
|
|
static int
|
|
bfcache_eq (const void *arg1, const void *arg2)
|
|
{
|
|
const struct btrace_frame_cache *cache1
|
|
= (const struct btrace_frame_cache *) arg1;
|
|
const struct btrace_frame_cache *cache2
|
|
= (const struct btrace_frame_cache *) arg2;
|
|
|
|
return cache1->frame == cache2->frame;
|
|
}
|
|
|
|
/* Create a new btrace frame cache. */
|
|
|
|
static struct btrace_frame_cache *
|
|
bfcache_new (struct frame_info *frame)
|
|
{
|
|
struct btrace_frame_cache *cache;
|
|
void **slot;
|
|
|
|
cache = FRAME_OBSTACK_ZALLOC (struct btrace_frame_cache);
|
|
cache->frame = frame;
|
|
|
|
slot = htab_find_slot (bfcache, cache, INSERT);
|
|
gdb_assert (*slot == NULL);
|
|
*slot = cache;
|
|
|
|
return cache;
|
|
}
|
|
|
|
/* Extract the branch trace function from a branch trace frame. */
|
|
|
|
static const struct btrace_function *
|
|
btrace_get_frame_function (struct frame_info *frame)
|
|
{
|
|
const struct btrace_frame_cache *cache;
|
|
struct btrace_frame_cache pattern;
|
|
void **slot;
|
|
|
|
pattern.frame = frame;
|
|
|
|
slot = htab_find_slot (bfcache, &pattern, NO_INSERT);
|
|
if (slot == NULL)
|
|
return NULL;
|
|
|
|
cache = (const struct btrace_frame_cache *) *slot;
|
|
return cache->bfun;
|
|
}
|
|
|
|
/* Implement stop_reason method for record_btrace_frame_unwind. */
|
|
|
|
static enum unwind_stop_reason
|
|
record_btrace_frame_unwind_stop_reason (struct frame_info *this_frame,
|
|
void **this_cache)
|
|
{
|
|
const struct btrace_frame_cache *cache;
|
|
const struct btrace_function *bfun;
|
|
|
|
cache = (const struct btrace_frame_cache *) *this_cache;
|
|
bfun = cache->bfun;
|
|
gdb_assert (bfun != NULL);
|
|
|
|
if (bfun->up == 0)
|
|
return UNWIND_UNAVAILABLE;
|
|
|
|
return UNWIND_NO_REASON;
|
|
}
|
|
|
|
/* Implement this_id method for record_btrace_frame_unwind. */
|
|
|
|
static void
|
|
record_btrace_frame_this_id (struct frame_info *this_frame, void **this_cache,
|
|
struct frame_id *this_id)
|
|
{
|
|
const struct btrace_frame_cache *cache;
|
|
const struct btrace_function *bfun;
|
|
struct btrace_call_iterator it;
|
|
CORE_ADDR code, special;
|
|
|
|
cache = (const struct btrace_frame_cache *) *this_cache;
|
|
|
|
bfun = cache->bfun;
|
|
gdb_assert (bfun != NULL);
|
|
|
|
while (btrace_find_call_by_number (&it, &cache->tp->btrace, bfun->prev) != 0)
|
|
bfun = btrace_call_get (&it);
|
|
|
|
code = get_frame_func (this_frame);
|
|
special = bfun->number;
|
|
|
|
*this_id = frame_id_build_unavailable_stack_special (code, special);
|
|
|
|
DEBUG ("[frame] %s id: (!stack, pc=%s, special=%s)",
|
|
btrace_get_bfun_name (cache->bfun),
|
|
core_addr_to_string_nz (this_id->code_addr),
|
|
core_addr_to_string_nz (this_id->special_addr));
|
|
}
|
|
|
|
/* Implement prev_register method for record_btrace_frame_unwind. */
|
|
|
|
static struct value *
|
|
record_btrace_frame_prev_register (struct frame_info *this_frame,
|
|
void **this_cache,
|
|
int regnum)
|
|
{
|
|
const struct btrace_frame_cache *cache;
|
|
const struct btrace_function *bfun, *caller;
|
|
struct btrace_call_iterator it;
|
|
struct gdbarch *gdbarch;
|
|
CORE_ADDR pc;
|
|
int pcreg;
|
|
|
|
gdbarch = get_frame_arch (this_frame);
|
|
pcreg = gdbarch_pc_regnum (gdbarch);
|
|
if (pcreg < 0 || regnum != pcreg)
|
|
throw_error (NOT_AVAILABLE_ERROR,
|
|
_("Registers are not available in btrace record history"));
|
|
|
|
cache = (const struct btrace_frame_cache *) *this_cache;
|
|
bfun = cache->bfun;
|
|
gdb_assert (bfun != NULL);
|
|
|
|
if (btrace_find_call_by_number (&it, &cache->tp->btrace, bfun->up) == 0)
|
|
throw_error (NOT_AVAILABLE_ERROR,
|
|
_("No caller in btrace record history"));
|
|
|
|
caller = btrace_call_get (&it);
|
|
|
|
if ((bfun->flags & BFUN_UP_LINKS_TO_RET) != 0)
|
|
pc = caller->insn.front ().pc;
|
|
else
|
|
{
|
|
pc = caller->insn.back ().pc;
|
|
pc += gdb_insn_length (gdbarch, pc);
|
|
}
|
|
|
|
DEBUG ("[frame] unwound PC in %s on level %d: %s",
|
|
btrace_get_bfun_name (bfun), bfun->level,
|
|
core_addr_to_string_nz (pc));
|
|
|
|
return frame_unwind_got_address (this_frame, regnum, pc);
|
|
}
|
|
|
|
/* Implement sniffer method for record_btrace_frame_unwind. */
|
|
|
|
static int
|
|
record_btrace_frame_sniffer (const struct frame_unwind *self,
|
|
struct frame_info *this_frame,
|
|
void **this_cache)
|
|
{
|
|
const struct btrace_function *bfun;
|
|
struct btrace_frame_cache *cache;
|
|
struct thread_info *tp;
|
|
struct frame_info *next;
|
|
|
|
/* THIS_FRAME does not contain a reference to its thread. */
|
|
tp = inferior_thread ();
|
|
|
|
bfun = NULL;
|
|
next = get_next_frame (this_frame);
|
|
if (next == NULL)
|
|
{
|
|
const struct btrace_insn_iterator *replay;
|
|
|
|
replay = tp->btrace.replay;
|
|
if (replay != NULL)
|
|
bfun = &replay->btinfo->functions[replay->call_index];
|
|
}
|
|
else
|
|
{
|
|
const struct btrace_function *callee;
|
|
struct btrace_call_iterator it;
|
|
|
|
callee = btrace_get_frame_function (next);
|
|
if (callee == NULL || (callee->flags & BFUN_UP_LINKS_TO_TAILCALL) != 0)
|
|
return 0;
|
|
|
|
if (btrace_find_call_by_number (&it, &tp->btrace, callee->up) == 0)
|
|
return 0;
|
|
|
|
bfun = btrace_call_get (&it);
|
|
}
|
|
|
|
if (bfun == NULL)
|
|
return 0;
|
|
|
|
DEBUG ("[frame] sniffed frame for %s on level %d",
|
|
btrace_get_bfun_name (bfun), bfun->level);
|
|
|
|
/* This is our frame. Initialize the frame cache. */
|
|
cache = bfcache_new (this_frame);
|
|
cache->tp = tp;
|
|
cache->bfun = bfun;
|
|
|
|
*this_cache = cache;
|
|
return 1;
|
|
}
|
|
|
|
/* Implement sniffer method for record_btrace_tailcall_frame_unwind. */
|
|
|
|
static int
|
|
record_btrace_tailcall_frame_sniffer (const struct frame_unwind *self,
|
|
struct frame_info *this_frame,
|
|
void **this_cache)
|
|
{
|
|
const struct btrace_function *bfun, *callee;
|
|
struct btrace_frame_cache *cache;
|
|
struct btrace_call_iterator it;
|
|
struct frame_info *next;
|
|
struct thread_info *tinfo;
|
|
|
|
next = get_next_frame (this_frame);
|
|
if (next == NULL)
|
|
return 0;
|
|
|
|
callee = btrace_get_frame_function (next);
|
|
if (callee == NULL)
|
|
return 0;
|
|
|
|
if ((callee->flags & BFUN_UP_LINKS_TO_TAILCALL) == 0)
|
|
return 0;
|
|
|
|
tinfo = inferior_thread ();
|
|
if (btrace_find_call_by_number (&it, &tinfo->btrace, callee->up) == 0)
|
|
return 0;
|
|
|
|
bfun = btrace_call_get (&it);
|
|
|
|
DEBUG ("[frame] sniffed tailcall frame for %s on level %d",
|
|
btrace_get_bfun_name (bfun), bfun->level);
|
|
|
|
/* This is our frame. Initialize the frame cache. */
|
|
cache = bfcache_new (this_frame);
|
|
cache->tp = tinfo;
|
|
cache->bfun = bfun;
|
|
|
|
*this_cache = cache;
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
record_btrace_frame_dealloc_cache (struct frame_info *self, void *this_cache)
|
|
{
|
|
struct btrace_frame_cache *cache;
|
|
void **slot;
|
|
|
|
cache = (struct btrace_frame_cache *) this_cache;
|
|
|
|
slot = htab_find_slot (bfcache, cache, NO_INSERT);
|
|
gdb_assert (slot != NULL);
|
|
|
|
htab_remove_elt (bfcache, cache);
|
|
}
|
|
|
|
/* btrace recording does not store previous memory content, neither the stack
|
|
frames content. Any unwinding would return erroneous results as the stack
|
|
contents no longer matches the changed PC value restored from history.
|
|
Therefore this unwinder reports any possibly unwound registers as
|
|
<unavailable>. */
|
|
|
|
const struct frame_unwind record_btrace_frame_unwind =
|
|
{
|
|
NORMAL_FRAME,
|
|
record_btrace_frame_unwind_stop_reason,
|
|
record_btrace_frame_this_id,
|
|
record_btrace_frame_prev_register,
|
|
NULL,
|
|
record_btrace_frame_sniffer,
|
|
record_btrace_frame_dealloc_cache
|
|
};
|
|
|
|
const struct frame_unwind record_btrace_tailcall_frame_unwind =
|
|
{
|
|
TAILCALL_FRAME,
|
|
record_btrace_frame_unwind_stop_reason,
|
|
record_btrace_frame_this_id,
|
|
record_btrace_frame_prev_register,
|
|
NULL,
|
|
record_btrace_tailcall_frame_sniffer,
|
|
record_btrace_frame_dealloc_cache
|
|
};
|
|
|
|
/* Implement the get_unwinder method. */
|
|
|
|
const struct frame_unwind *
|
|
record_btrace_target::get_unwinder ()
|
|
{
|
|
return &record_btrace_frame_unwind;
|
|
}
|
|
|
|
/* Implement the get_tailcall_unwinder method. */
|
|
|
|
const struct frame_unwind *
|
|
record_btrace_target::get_tailcall_unwinder ()
|
|
{
|
|
return &record_btrace_tailcall_frame_unwind;
|
|
}
|
|
|
|
/* Return a human-readable string for FLAG. */
|
|
|
|
static const char *
|
|
btrace_thread_flag_to_str (enum btrace_thread_flag flag)
|
|
{
|
|
switch (flag)
|
|
{
|
|
case BTHR_STEP:
|
|
return "step";
|
|
|
|
case BTHR_RSTEP:
|
|
return "reverse-step";
|
|
|
|
case BTHR_CONT:
|
|
return "cont";
|
|
|
|
case BTHR_RCONT:
|
|
return "reverse-cont";
|
|
|
|
case BTHR_STOP:
|
|
return "stop";
|
|
}
|
|
|
|
return "<invalid>";
|
|
}
|
|
|
|
/* Indicate that TP should be resumed according to FLAG. */
|
|
|
|
static void
|
|
record_btrace_resume_thread (struct thread_info *tp,
|
|
enum btrace_thread_flag flag)
|
|
{
|
|
struct btrace_thread_info *btinfo;
|
|
|
|
DEBUG ("resuming thread %s (%s): %x (%s)", print_thread_id (tp),
|
|
target_pid_to_str (tp->ptid).c_str (), flag,
|
|
btrace_thread_flag_to_str (flag));
|
|
|
|
btinfo = &tp->btrace;
|
|
|
|
/* Fetch the latest branch trace. */
|
|
btrace_fetch (tp, record_btrace_get_cpu ());
|
|
|
|
/* A resume request overwrites a preceding resume or stop request. */
|
|
btinfo->flags &= ~(BTHR_MOVE | BTHR_STOP);
|
|
btinfo->flags |= flag;
|
|
}
|
|
|
|
/* Get the current frame for TP. */
|
|
|
|
static struct frame_id
|
|
get_thread_current_frame_id (struct thread_info *tp)
|
|
{
|
|
struct frame_id id;
|
|
int executing;
|
|
|
|
/* Set current thread, which is implicitly used by
|
|
get_current_frame. */
|
|
scoped_restore_current_thread restore_thread;
|
|
|
|
switch_to_thread (tp);
|
|
|
|
process_stratum_target *proc_target = tp->inf->process_target ();
|
|
|
|
/* Clear the executing flag to allow changes to the current frame.
|
|
We are not actually running, yet. We just started a reverse execution
|
|
command or a record goto command.
|
|
For the latter, EXECUTING is false and this has no effect.
|
|
For the former, EXECUTING is true and we're in wait, about to
|
|
move the thread. Since we need to recompute the stack, we temporarily
|
|
set EXECUTING to false. */
|
|
executing = tp->executing;
|
|
set_executing (proc_target, inferior_ptid, false);
|
|
|
|
id = null_frame_id;
|
|
try
|
|
{
|
|
id = get_frame_id (get_current_frame ());
|
|
}
|
|
catch (const gdb_exception &except)
|
|
{
|
|
/* Restore the previous execution state. */
|
|
set_executing (proc_target, inferior_ptid, executing);
|
|
|
|
throw;
|
|
}
|
|
|
|
/* Restore the previous execution state. */
|
|
set_executing (proc_target, inferior_ptid, executing);
|
|
|
|
return id;
|
|
}
|
|
|
|
/* Start replaying a thread. */
|
|
|
|
static struct btrace_insn_iterator *
|
|
record_btrace_start_replaying (struct thread_info *tp)
|
|
{
|
|
struct btrace_insn_iterator *replay;
|
|
struct btrace_thread_info *btinfo;
|
|
|
|
btinfo = &tp->btrace;
|
|
replay = NULL;
|
|
|
|
/* We can't start replaying without trace. */
|
|
if (btinfo->functions.empty ())
|
|
return NULL;
|
|
|
|
/* GDB stores the current frame_id when stepping in order to detects steps
|
|
into subroutines.
|
|
Since frames are computed differently when we're replaying, we need to
|
|
recompute those stored frames and fix them up so we can still detect
|
|
subroutines after we started replaying. */
|
|
try
|
|
{
|
|
struct frame_id frame_id;
|
|
int upd_step_frame_id, upd_step_stack_frame_id;
|
|
|
|
/* The current frame without replaying - computed via normal unwind. */
|
|
frame_id = get_thread_current_frame_id (tp);
|
|
|
|
/* Check if we need to update any stepping-related frame id's. */
|
|
upd_step_frame_id = frame_id_eq (frame_id,
|
|
tp->control.step_frame_id);
|
|
upd_step_stack_frame_id = frame_id_eq (frame_id,
|
|
tp->control.step_stack_frame_id);
|
|
|
|
/* We start replaying at the end of the branch trace. This corresponds
|
|
to the current instruction. */
|
|
replay = XNEW (struct btrace_insn_iterator);
|
|
btrace_insn_end (replay, btinfo);
|
|
|
|
/* Skip gaps at the end of the trace. */
|
|
while (btrace_insn_get (replay) == NULL)
|
|
{
|
|
unsigned int steps;
|
|
|
|
steps = btrace_insn_prev (replay, 1);
|
|
if (steps == 0)
|
|
error (_("No trace."));
|
|
}
|
|
|
|
/* We're not replaying, yet. */
|
|
gdb_assert (btinfo->replay == NULL);
|
|
btinfo->replay = replay;
|
|
|
|
/* Make sure we're not using any stale registers. */
|
|
registers_changed_thread (tp);
|
|
|
|
/* The current frame with replaying - computed via btrace unwind. */
|
|
frame_id = get_thread_current_frame_id (tp);
|
|
|
|
/* Replace stepping related frames where necessary. */
|
|
if (upd_step_frame_id)
|
|
tp->control.step_frame_id = frame_id;
|
|
if (upd_step_stack_frame_id)
|
|
tp->control.step_stack_frame_id = frame_id;
|
|
}
|
|
catch (const gdb_exception &except)
|
|
{
|
|
xfree (btinfo->replay);
|
|
btinfo->replay = NULL;
|
|
|
|
registers_changed_thread (tp);
|
|
|
|
throw;
|
|
}
|
|
|
|
return replay;
|
|
}
|
|
|
|
/* Stop replaying a thread. */
|
|
|
|
static void
|
|
record_btrace_stop_replaying (struct thread_info *tp)
|
|
{
|
|
struct btrace_thread_info *btinfo;
|
|
|
|
btinfo = &tp->btrace;
|
|
|
|
xfree (btinfo->replay);
|
|
btinfo->replay = NULL;
|
|
|
|
/* Make sure we're not leaving any stale registers. */
|
|
registers_changed_thread (tp);
|
|
}
|
|
|
|
/* Stop replaying TP if it is at the end of its execution history. */
|
|
|
|
static void
|
|
record_btrace_stop_replaying_at_end (struct thread_info *tp)
|
|
{
|
|
struct btrace_insn_iterator *replay, end;
|
|
struct btrace_thread_info *btinfo;
|
|
|
|
btinfo = &tp->btrace;
|
|
replay = btinfo->replay;
|
|
|
|
if (replay == NULL)
|
|
return;
|
|
|
|
btrace_insn_end (&end, btinfo);
|
|
|
|
if (btrace_insn_cmp (replay, &end) == 0)
|
|
record_btrace_stop_replaying (tp);
|
|
}
|
|
|
|
/* The resume method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::resume (ptid_t ptid, int step, enum gdb_signal signal)
|
|
{
|
|
enum btrace_thread_flag flag, cflag;
|
|
|
|
DEBUG ("resume %s: %s%s", target_pid_to_str (ptid).c_str (),
|
|
::execution_direction == EXEC_REVERSE ? "reverse-" : "",
|
|
step ? "step" : "cont");
|
|
|
|
/* Store the execution direction of the last resume.
|
|
|
|
If there is more than one resume call, we have to rely on infrun
|
|
to not change the execution direction in-between. */
|
|
record_btrace_resume_exec_dir = ::execution_direction;
|
|
|
|
/* As long as we're not replaying, just forward the request.
|
|
|
|
For non-stop targets this means that no thread is replaying. In order to
|
|
make progress, we may need to explicitly move replaying threads to the end
|
|
of their execution history. */
|
|
if ((::execution_direction != EXEC_REVERSE)
|
|
&& !record_is_replaying (minus_one_ptid))
|
|
{
|
|
this->beneath ()->resume (ptid, step, signal);
|
|
return;
|
|
}
|
|
|
|
/* Compute the btrace thread flag for the requested move. */
|
|
if (::execution_direction == EXEC_REVERSE)
|
|
{
|
|
flag = step == 0 ? BTHR_RCONT : BTHR_RSTEP;
|
|
cflag = BTHR_RCONT;
|
|
}
|
|
else
|
|
{
|
|
flag = step == 0 ? BTHR_CONT : BTHR_STEP;
|
|
cflag = BTHR_CONT;
|
|
}
|
|
|
|
/* We just indicate the resume intent here. The actual stepping happens in
|
|
record_btrace_wait below.
|
|
|
|
For all-stop targets, we only step INFERIOR_PTID and continue others. */
|
|
|
|
process_stratum_target *proc_target = current_inferior ()->process_target ();
|
|
|
|
if (!target_is_non_stop_p ())
|
|
{
|
|
gdb_assert (inferior_ptid.matches (ptid));
|
|
|
|
for (thread_info *tp : all_non_exited_threads (proc_target, ptid))
|
|
{
|
|
if (tp->ptid.matches (inferior_ptid))
|
|
record_btrace_resume_thread (tp, flag);
|
|
else
|
|
record_btrace_resume_thread (tp, cflag);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
for (thread_info *tp : all_non_exited_threads (proc_target, ptid))
|
|
record_btrace_resume_thread (tp, flag);
|
|
}
|
|
|
|
/* Async support. */
|
|
if (target_can_async_p ())
|
|
{
|
|
target_async (1);
|
|
mark_async_event_handler (record_btrace_async_inferior_event_handler);
|
|
}
|
|
}
|
|
|
|
/* The commit_resume method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::commit_resume ()
|
|
{
|
|
if ((::execution_direction != EXEC_REVERSE)
|
|
&& !record_is_replaying (minus_one_ptid))
|
|
beneath ()->commit_resume ();
|
|
}
|
|
|
|
/* Cancel resuming TP. */
|
|
|
|
static void
|
|
record_btrace_cancel_resume (struct thread_info *tp)
|
|
{
|
|
enum btrace_thread_flag flags;
|
|
|
|
flags = tp->btrace.flags & (BTHR_MOVE | BTHR_STOP);
|
|
if (flags == 0)
|
|
return;
|
|
|
|
DEBUG ("cancel resume thread %s (%s): %x (%s)",
|
|
print_thread_id (tp),
|
|
target_pid_to_str (tp->ptid).c_str (), flags,
|
|
btrace_thread_flag_to_str (flags));
|
|
|
|
tp->btrace.flags &= ~(BTHR_MOVE | BTHR_STOP);
|
|
record_btrace_stop_replaying_at_end (tp);
|
|
}
|
|
|
|
/* Return a target_waitstatus indicating that we ran out of history. */
|
|
|
|
static struct target_waitstatus
|
|
btrace_step_no_history (void)
|
|
{
|
|
struct target_waitstatus status;
|
|
|
|
status.kind = TARGET_WAITKIND_NO_HISTORY;
|
|
|
|
return status;
|
|
}
|
|
|
|
/* Return a target_waitstatus indicating that a step finished. */
|
|
|
|
static struct target_waitstatus
|
|
btrace_step_stopped (void)
|
|
{
|
|
struct target_waitstatus status;
|
|
|
|
status.kind = TARGET_WAITKIND_STOPPED;
|
|
status.value.sig = GDB_SIGNAL_TRAP;
|
|
|
|
return status;
|
|
}
|
|
|
|
/* Return a target_waitstatus indicating that a thread was stopped as
|
|
requested. */
|
|
|
|
static struct target_waitstatus
|
|
btrace_step_stopped_on_request (void)
|
|
{
|
|
struct target_waitstatus status;
|
|
|
|
status.kind = TARGET_WAITKIND_STOPPED;
|
|
status.value.sig = GDB_SIGNAL_0;
|
|
|
|
return status;
|
|
}
|
|
|
|
/* Return a target_waitstatus indicating a spurious stop. */
|
|
|
|
static struct target_waitstatus
|
|
btrace_step_spurious (void)
|
|
{
|
|
struct target_waitstatus status;
|
|
|
|
status.kind = TARGET_WAITKIND_SPURIOUS;
|
|
|
|
return status;
|
|
}
|
|
|
|
/* Return a target_waitstatus indicating that the thread was not resumed. */
|
|
|
|
static struct target_waitstatus
|
|
btrace_step_no_resumed (void)
|
|
{
|
|
struct target_waitstatus status;
|
|
|
|
status.kind = TARGET_WAITKIND_NO_RESUMED;
|
|
|
|
return status;
|
|
}
|
|
|
|
/* Return a target_waitstatus indicating that we should wait again. */
|
|
|
|
static struct target_waitstatus
|
|
btrace_step_again (void)
|
|
{
|
|
struct target_waitstatus status;
|
|
|
|
status.kind = TARGET_WAITKIND_IGNORE;
|
|
|
|
return status;
|
|
}
|
|
|
|
/* Clear the record histories. */
|
|
|
|
static void
|
|
record_btrace_clear_histories (struct btrace_thread_info *btinfo)
|
|
{
|
|
xfree (btinfo->insn_history);
|
|
xfree (btinfo->call_history);
|
|
|
|
btinfo->insn_history = NULL;
|
|
btinfo->call_history = NULL;
|
|
}
|
|
|
|
/* Check whether TP's current replay position is at a breakpoint. */
|
|
|
|
static int
|
|
record_btrace_replay_at_breakpoint (struct thread_info *tp)
|
|
{
|
|
struct btrace_insn_iterator *replay;
|
|
struct btrace_thread_info *btinfo;
|
|
const struct btrace_insn *insn;
|
|
|
|
btinfo = &tp->btrace;
|
|
replay = btinfo->replay;
|
|
|
|
if (replay == NULL)
|
|
return 0;
|
|
|
|
insn = btrace_insn_get (replay);
|
|
if (insn == NULL)
|
|
return 0;
|
|
|
|
return record_check_stopped_by_breakpoint (tp->inf->aspace, insn->pc,
|
|
&btinfo->stop_reason);
|
|
}
|
|
|
|
/* Step one instruction in forward direction. */
|
|
|
|
static struct target_waitstatus
|
|
record_btrace_single_step_forward (struct thread_info *tp)
|
|
{
|
|
struct btrace_insn_iterator *replay, end, start;
|
|
struct btrace_thread_info *btinfo;
|
|
|
|
btinfo = &tp->btrace;
|
|
replay = btinfo->replay;
|
|
|
|
/* We're done if we're not replaying. */
|
|
if (replay == NULL)
|
|
return btrace_step_no_history ();
|
|
|
|
/* Check if we're stepping a breakpoint. */
|
|
if (record_btrace_replay_at_breakpoint (tp))
|
|
return btrace_step_stopped ();
|
|
|
|
/* Skip gaps during replay. If we end up at a gap (at the end of the trace),
|
|
jump back to the instruction at which we started. */
|
|
start = *replay;
|
|
do
|
|
{
|
|
unsigned int steps;
|
|
|
|
/* We will bail out here if we continue stepping after reaching the end
|
|
of the execution history. */
|
|
steps = btrace_insn_next (replay, 1);
|
|
if (steps == 0)
|
|
{
|
|
*replay = start;
|
|
return btrace_step_no_history ();
|
|
}
|
|
}
|
|
while (btrace_insn_get (replay) == NULL);
|
|
|
|
/* Determine the end of the instruction trace. */
|
|
btrace_insn_end (&end, btinfo);
|
|
|
|
/* The execution trace contains (and ends with) the current instruction.
|
|
This instruction has not been executed, yet, so the trace really ends
|
|
one instruction earlier. */
|
|
if (btrace_insn_cmp (replay, &end) == 0)
|
|
return btrace_step_no_history ();
|
|
|
|
return btrace_step_spurious ();
|
|
}
|
|
|
|
/* Step one instruction in backward direction. */
|
|
|
|
static struct target_waitstatus
|
|
record_btrace_single_step_backward (struct thread_info *tp)
|
|
{
|
|
struct btrace_insn_iterator *replay, start;
|
|
struct btrace_thread_info *btinfo;
|
|
|
|
btinfo = &tp->btrace;
|
|
replay = btinfo->replay;
|
|
|
|
/* Start replaying if we're not already doing so. */
|
|
if (replay == NULL)
|
|
replay = record_btrace_start_replaying (tp);
|
|
|
|
/* If we can't step any further, we reached the end of the history.
|
|
Skip gaps during replay. If we end up at a gap (at the beginning of
|
|
the trace), jump back to the instruction at which we started. */
|
|
start = *replay;
|
|
do
|
|
{
|
|
unsigned int steps;
|
|
|
|
steps = btrace_insn_prev (replay, 1);
|
|
if (steps == 0)
|
|
{
|
|
*replay = start;
|
|
return btrace_step_no_history ();
|
|
}
|
|
}
|
|
while (btrace_insn_get (replay) == NULL);
|
|
|
|
/* Check if we're stepping a breakpoint.
|
|
|
|
For reverse-stepping, this check is after the step. There is logic in
|
|
infrun.c that handles reverse-stepping separately. See, for example,
|
|
proceed and adjust_pc_after_break.
|
|
|
|
This code assumes that for reverse-stepping, PC points to the last
|
|
de-executed instruction, whereas for forward-stepping PC points to the
|
|
next to-be-executed instruction. */
|
|
if (record_btrace_replay_at_breakpoint (tp))
|
|
return btrace_step_stopped ();
|
|
|
|
return btrace_step_spurious ();
|
|
}
|
|
|
|
/* Step a single thread. */
|
|
|
|
static struct target_waitstatus
|
|
record_btrace_step_thread (struct thread_info *tp)
|
|
{
|
|
struct btrace_thread_info *btinfo;
|
|
struct target_waitstatus status;
|
|
enum btrace_thread_flag flags;
|
|
|
|
btinfo = &tp->btrace;
|
|
|
|
flags = btinfo->flags & (BTHR_MOVE | BTHR_STOP);
|
|
btinfo->flags &= ~(BTHR_MOVE | BTHR_STOP);
|
|
|
|
DEBUG ("stepping thread %s (%s): %x (%s)", print_thread_id (tp),
|
|
target_pid_to_str (tp->ptid).c_str (), flags,
|
|
btrace_thread_flag_to_str (flags));
|
|
|
|
/* We can't step without an execution history. */
|
|
if ((flags & BTHR_MOVE) != 0 && btrace_is_empty (tp))
|
|
return btrace_step_no_history ();
|
|
|
|
switch (flags)
|
|
{
|
|
default:
|
|
internal_error (__FILE__, __LINE__, _("invalid stepping type."));
|
|
|
|
case BTHR_STOP:
|
|
return btrace_step_stopped_on_request ();
|
|
|
|
case BTHR_STEP:
|
|
status = record_btrace_single_step_forward (tp);
|
|
if (status.kind != TARGET_WAITKIND_SPURIOUS)
|
|
break;
|
|
|
|
return btrace_step_stopped ();
|
|
|
|
case BTHR_RSTEP:
|
|
status = record_btrace_single_step_backward (tp);
|
|
if (status.kind != TARGET_WAITKIND_SPURIOUS)
|
|
break;
|
|
|
|
return btrace_step_stopped ();
|
|
|
|
case BTHR_CONT:
|
|
status = record_btrace_single_step_forward (tp);
|
|
if (status.kind != TARGET_WAITKIND_SPURIOUS)
|
|
break;
|
|
|
|
btinfo->flags |= flags;
|
|
return btrace_step_again ();
|
|
|
|
case BTHR_RCONT:
|
|
status = record_btrace_single_step_backward (tp);
|
|
if (status.kind != TARGET_WAITKIND_SPURIOUS)
|
|
break;
|
|
|
|
btinfo->flags |= flags;
|
|
return btrace_step_again ();
|
|
}
|
|
|
|
/* We keep threads moving at the end of their execution history. The wait
|
|
method will stop the thread for whom the event is reported. */
|
|
if (status.kind == TARGET_WAITKIND_NO_HISTORY)
|
|
btinfo->flags |= flags;
|
|
|
|
return status;
|
|
}
|
|
|
|
/* Announce further events if necessary. */
|
|
|
|
static void
|
|
record_btrace_maybe_mark_async_event
|
|
(const std::vector<thread_info *> &moving,
|
|
const std::vector<thread_info *> &no_history)
|
|
{
|
|
bool more_moving = !moving.empty ();
|
|
bool more_no_history = !no_history.empty ();;
|
|
|
|
if (!more_moving && !more_no_history)
|
|
return;
|
|
|
|
if (more_moving)
|
|
DEBUG ("movers pending");
|
|
|
|
if (more_no_history)
|
|
DEBUG ("no-history pending");
|
|
|
|
mark_async_event_handler (record_btrace_async_inferior_event_handler);
|
|
}
|
|
|
|
/* The wait method of target record-btrace. */
|
|
|
|
ptid_t
|
|
record_btrace_target::wait (ptid_t ptid, struct target_waitstatus *status,
|
|
int options)
|
|
{
|
|
std::vector<thread_info *> moving;
|
|
std::vector<thread_info *> no_history;
|
|
|
|
DEBUG ("wait %s (0x%x)", target_pid_to_str (ptid).c_str (), options);
|
|
|
|
/* As long as we're not replaying, just forward the request. */
|
|
if ((::execution_direction != EXEC_REVERSE)
|
|
&& !record_is_replaying (minus_one_ptid))
|
|
{
|
|
return this->beneath ()->wait (ptid, status, options);
|
|
}
|
|
|
|
/* Keep a work list of moving threads. */
|
|
process_stratum_target *proc_target = current_inferior ()->process_target ();
|
|
for (thread_info *tp : all_non_exited_threads (proc_target, ptid))
|
|
if ((tp->btrace.flags & (BTHR_MOVE | BTHR_STOP)) != 0)
|
|
moving.push_back (tp);
|
|
|
|
if (moving.empty ())
|
|
{
|
|
*status = btrace_step_no_resumed ();
|
|
|
|
DEBUG ("wait ended by %s: %s", target_pid_to_str (null_ptid).c_str (),
|
|
target_waitstatus_to_string (status).c_str ());
|
|
|
|
return null_ptid;
|
|
}
|
|
|
|
/* Step moving threads one by one, one step each, until either one thread
|
|
reports an event or we run out of threads to step.
|
|
|
|
When stepping more than one thread, chances are that some threads reach
|
|
the end of their execution history earlier than others. If we reported
|
|
this immediately, all-stop on top of non-stop would stop all threads and
|
|
resume the same threads next time. And we would report the same thread
|
|
having reached the end of its execution history again.
|
|
|
|
In the worst case, this would starve the other threads. But even if other
|
|
threads would be allowed to make progress, this would result in far too
|
|
many intermediate stops.
|
|
|
|
We therefore delay the reporting of "no execution history" until we have
|
|
nothing else to report. By this time, all threads should have moved to
|
|
either the beginning or the end of their execution history. There will
|
|
be a single user-visible stop. */
|
|
struct thread_info *eventing = NULL;
|
|
while ((eventing == NULL) && !moving.empty ())
|
|
{
|
|
for (unsigned int ix = 0; eventing == NULL && ix < moving.size ();)
|
|
{
|
|
thread_info *tp = moving[ix];
|
|
|
|
*status = record_btrace_step_thread (tp);
|
|
|
|
switch (status->kind)
|
|
{
|
|
case TARGET_WAITKIND_IGNORE:
|
|
ix++;
|
|
break;
|
|
|
|
case TARGET_WAITKIND_NO_HISTORY:
|
|
no_history.push_back (ordered_remove (moving, ix));
|
|
break;
|
|
|
|
default:
|
|
eventing = unordered_remove (moving, ix);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (eventing == NULL)
|
|
{
|
|
/* We started with at least one moving thread. This thread must have
|
|
either stopped or reached the end of its execution history.
|
|
|
|
In the former case, EVENTING must not be NULL.
|
|
In the latter case, NO_HISTORY must not be empty. */
|
|
gdb_assert (!no_history.empty ());
|
|
|
|
/* We kept threads moving at the end of their execution history. Stop
|
|
EVENTING now that we are going to report its stop. */
|
|
eventing = unordered_remove (no_history, 0);
|
|
eventing->btrace.flags &= ~BTHR_MOVE;
|
|
|
|
*status = btrace_step_no_history ();
|
|
}
|
|
|
|
gdb_assert (eventing != NULL);
|
|
|
|
/* We kept threads replaying at the end of their execution history. Stop
|
|
replaying EVENTING now that we are going to report its stop. */
|
|
record_btrace_stop_replaying_at_end (eventing);
|
|
|
|
/* Stop all other threads. */
|
|
if (!target_is_non_stop_p ())
|
|
{
|
|
for (thread_info *tp : all_non_exited_threads ())
|
|
record_btrace_cancel_resume (tp);
|
|
}
|
|
|
|
/* In async mode, we need to announce further events. */
|
|
if (target_is_async_p ())
|
|
record_btrace_maybe_mark_async_event (moving, no_history);
|
|
|
|
/* Start record histories anew from the current position. */
|
|
record_btrace_clear_histories (&eventing->btrace);
|
|
|
|
/* We moved the replay position but did not update registers. */
|
|
registers_changed_thread (eventing);
|
|
|
|
DEBUG ("wait ended by thread %s (%s): %s",
|
|
print_thread_id (eventing),
|
|
target_pid_to_str (eventing->ptid).c_str (),
|
|
target_waitstatus_to_string (status).c_str ());
|
|
|
|
return eventing->ptid;
|
|
}
|
|
|
|
/* The stop method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::stop (ptid_t ptid)
|
|
{
|
|
DEBUG ("stop %s", target_pid_to_str (ptid).c_str ());
|
|
|
|
/* As long as we're not replaying, just forward the request. */
|
|
if ((::execution_direction != EXEC_REVERSE)
|
|
&& !record_is_replaying (minus_one_ptid))
|
|
{
|
|
this->beneath ()->stop (ptid);
|
|
}
|
|
else
|
|
{
|
|
process_stratum_target *proc_target
|
|
= current_inferior ()->process_target ();
|
|
|
|
for (thread_info *tp : all_non_exited_threads (proc_target, ptid))
|
|
{
|
|
tp->btrace.flags &= ~BTHR_MOVE;
|
|
tp->btrace.flags |= BTHR_STOP;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* The can_execute_reverse method of target record-btrace. */
|
|
|
|
bool
|
|
record_btrace_target::can_execute_reverse ()
|
|
{
|
|
return true;
|
|
}
|
|
|
|
/* The stopped_by_sw_breakpoint method of target record-btrace. */
|
|
|
|
bool
|
|
record_btrace_target::stopped_by_sw_breakpoint ()
|
|
{
|
|
if (record_is_replaying (minus_one_ptid))
|
|
{
|
|
struct thread_info *tp = inferior_thread ();
|
|
|
|
return tp->btrace.stop_reason == TARGET_STOPPED_BY_SW_BREAKPOINT;
|
|
}
|
|
|
|
return this->beneath ()->stopped_by_sw_breakpoint ();
|
|
}
|
|
|
|
/* The supports_stopped_by_sw_breakpoint method of target
|
|
record-btrace. */
|
|
|
|
bool
|
|
record_btrace_target::supports_stopped_by_sw_breakpoint ()
|
|
{
|
|
if (record_is_replaying (minus_one_ptid))
|
|
return true;
|
|
|
|
return this->beneath ()->supports_stopped_by_sw_breakpoint ();
|
|
}
|
|
|
|
/* The stopped_by_sw_breakpoint method of target record-btrace. */
|
|
|
|
bool
|
|
record_btrace_target::stopped_by_hw_breakpoint ()
|
|
{
|
|
if (record_is_replaying (minus_one_ptid))
|
|
{
|
|
struct thread_info *tp = inferior_thread ();
|
|
|
|
return tp->btrace.stop_reason == TARGET_STOPPED_BY_HW_BREAKPOINT;
|
|
}
|
|
|
|
return this->beneath ()->stopped_by_hw_breakpoint ();
|
|
}
|
|
|
|
/* The supports_stopped_by_hw_breakpoint method of target
|
|
record-btrace. */
|
|
|
|
bool
|
|
record_btrace_target::supports_stopped_by_hw_breakpoint ()
|
|
{
|
|
if (record_is_replaying (minus_one_ptid))
|
|
return true;
|
|
|
|
return this->beneath ()->supports_stopped_by_hw_breakpoint ();
|
|
}
|
|
|
|
/* The update_thread_list method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::update_thread_list ()
|
|
{
|
|
/* We don't add or remove threads during replay. */
|
|
if (record_is_replaying (minus_one_ptid))
|
|
return;
|
|
|
|
/* Forward the request. */
|
|
this->beneath ()->update_thread_list ();
|
|
}
|
|
|
|
/* The thread_alive method of target record-btrace. */
|
|
|
|
bool
|
|
record_btrace_target::thread_alive (ptid_t ptid)
|
|
{
|
|
/* We don't add or remove threads during replay. */
|
|
if (record_is_replaying (minus_one_ptid))
|
|
return true;
|
|
|
|
/* Forward the request. */
|
|
return this->beneath ()->thread_alive (ptid);
|
|
}
|
|
|
|
/* Set the replay branch trace instruction iterator. If IT is NULL, replay
|
|
is stopped. */
|
|
|
|
static void
|
|
record_btrace_set_replay (struct thread_info *tp,
|
|
const struct btrace_insn_iterator *it)
|
|
{
|
|
struct btrace_thread_info *btinfo;
|
|
|
|
btinfo = &tp->btrace;
|
|
|
|
if (it == NULL)
|
|
record_btrace_stop_replaying (tp);
|
|
else
|
|
{
|
|
if (btinfo->replay == NULL)
|
|
record_btrace_start_replaying (tp);
|
|
else if (btrace_insn_cmp (btinfo->replay, it) == 0)
|
|
return;
|
|
|
|
*btinfo->replay = *it;
|
|
registers_changed_thread (tp);
|
|
}
|
|
|
|
/* Start anew from the new replay position. */
|
|
record_btrace_clear_histories (btinfo);
|
|
|
|
inferior_thread ()->suspend.stop_pc
|
|
= regcache_read_pc (get_current_regcache ());
|
|
print_stack_frame (get_selected_frame (NULL), 1, SRC_AND_LOC, 1);
|
|
}
|
|
|
|
/* The goto_record_begin method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::goto_record_begin ()
|
|
{
|
|
struct thread_info *tp;
|
|
struct btrace_insn_iterator begin;
|
|
|
|
tp = require_btrace_thread ();
|
|
|
|
btrace_insn_begin (&begin, &tp->btrace);
|
|
|
|
/* Skip gaps at the beginning of the trace. */
|
|
while (btrace_insn_get (&begin) == NULL)
|
|
{
|
|
unsigned int steps;
|
|
|
|
steps = btrace_insn_next (&begin, 1);
|
|
if (steps == 0)
|
|
error (_("No trace."));
|
|
}
|
|
|
|
record_btrace_set_replay (tp, &begin);
|
|
}
|
|
|
|
/* The goto_record_end method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::goto_record_end ()
|
|
{
|
|
struct thread_info *tp;
|
|
|
|
tp = require_btrace_thread ();
|
|
|
|
record_btrace_set_replay (tp, NULL);
|
|
}
|
|
|
|
/* The goto_record method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::goto_record (ULONGEST insn)
|
|
{
|
|
struct thread_info *tp;
|
|
struct btrace_insn_iterator it;
|
|
unsigned int number;
|
|
int found;
|
|
|
|
number = insn;
|
|
|
|
/* Check for wrap-arounds. */
|
|
if (number != insn)
|
|
error (_("Instruction number out of range."));
|
|
|
|
tp = require_btrace_thread ();
|
|
|
|
found = btrace_find_insn_by_number (&it, &tp->btrace, number);
|
|
|
|
/* Check if the instruction could not be found or is a gap. */
|
|
if (found == 0 || btrace_insn_get (&it) == NULL)
|
|
error (_("No such instruction."));
|
|
|
|
record_btrace_set_replay (tp, &it);
|
|
}
|
|
|
|
/* The record_stop_replaying method of target record-btrace. */
|
|
|
|
void
|
|
record_btrace_target::record_stop_replaying ()
|
|
{
|
|
for (thread_info *tp : all_non_exited_threads ())
|
|
record_btrace_stop_replaying (tp);
|
|
}
|
|
|
|
/* The execution_direction target method. */
|
|
|
|
enum exec_direction_kind
|
|
record_btrace_target::execution_direction ()
|
|
{
|
|
return record_btrace_resume_exec_dir;
|
|
}
|
|
|
|
/* The prepare_to_generate_core target method. */
|
|
|
|
void
|
|
record_btrace_target::prepare_to_generate_core ()
|
|
{
|
|
record_btrace_generating_corefile = 1;
|
|
}
|
|
|
|
/* The done_generating_core target method. */
|
|
|
|
void
|
|
record_btrace_target::done_generating_core ()
|
|
{
|
|
record_btrace_generating_corefile = 0;
|
|
}
|
|
|
|
/* Start recording in BTS format. */
|
|
|
|
static void
|
|
cmd_record_btrace_bts_start (const char *args, int from_tty)
|
|
{
|
|
if (args != NULL && *args != 0)
|
|
error (_("Invalid argument."));
|
|
|
|
record_btrace_conf.format = BTRACE_FORMAT_BTS;
|
|
|
|
try
|
|
{
|
|
execute_command ("target record-btrace", from_tty);
|
|
}
|
|
catch (const gdb_exception &exception)
|
|
{
|
|
record_btrace_conf.format = BTRACE_FORMAT_NONE;
|
|
throw;
|
|
}
|
|
}
|
|
|
|
/* Start recording in Intel Processor Trace format. */
|
|
|
|
static void
|
|
cmd_record_btrace_pt_start (const char *args, int from_tty)
|
|
{
|
|
if (args != NULL && *args != 0)
|
|
error (_("Invalid argument."));
|
|
|
|
record_btrace_conf.format = BTRACE_FORMAT_PT;
|
|
|
|
try
|
|
{
|
|
execute_command ("target record-btrace", from_tty);
|
|
}
|
|
catch (const gdb_exception &exception)
|
|
{
|
|
record_btrace_conf.format = BTRACE_FORMAT_NONE;
|
|
throw;
|
|
}
|
|
}
|
|
|
|
/* Alias for "target record". */
|
|
|
|
static void
|
|
cmd_record_btrace_start (const char *args, int from_tty)
|
|
{
|
|
if (args != NULL && *args != 0)
|
|
error (_("Invalid argument."));
|
|
|
|
record_btrace_conf.format = BTRACE_FORMAT_PT;
|
|
|
|
try
|
|
{
|
|
execute_command ("target record-btrace", from_tty);
|
|
}
|
|
catch (const gdb_exception &exception)
|
|
{
|
|
record_btrace_conf.format = BTRACE_FORMAT_BTS;
|
|
|
|
try
|
|
{
|
|
execute_command ("target record-btrace", from_tty);
|
|
}
|
|
catch (const gdb_exception &ex)
|
|
{
|
|
record_btrace_conf.format = BTRACE_FORMAT_NONE;
|
|
throw;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* The "set record btrace" command. */
|
|
|
|
static void
|
|
cmd_set_record_btrace (const char *args, int from_tty)
|
|
{
|
|
printf_unfiltered (_("\"set record btrace\" must be followed "
|
|
"by an appropriate subcommand.\n"));
|
|
help_list (set_record_btrace_cmdlist, "set record btrace ",
|
|
all_commands, gdb_stdout);
|
|
}
|
|
|
|
/* The "show record btrace" command. */
|
|
|
|
static void
|
|
cmd_show_record_btrace (const char *args, int from_tty)
|
|
{
|
|
cmd_show_list (show_record_btrace_cmdlist, from_tty, "");
|
|
}
|
|
|
|
/* The "show record btrace replay-memory-access" command. */
|
|
|
|
static void
|
|
cmd_show_replay_memory_access (struct ui_file *file, int from_tty,
|
|
struct cmd_list_element *c, const char *value)
|
|
{
|
|
fprintf_filtered (gdb_stdout, _("Replay memory access is %s.\n"),
|
|
replay_memory_access);
|
|
}
|
|
|
|
/* The "set record btrace cpu none" command. */
|
|
|
|
static void
|
|
cmd_set_record_btrace_cpu_none (const char *args, int from_tty)
|
|
{
|
|
if (args != nullptr && *args != 0)
|
|
error (_("Trailing junk: '%s'."), args);
|
|
|
|
record_btrace_cpu_state = CS_NONE;
|
|
}
|
|
|
|
/* The "set record btrace cpu auto" command. */
|
|
|
|
static void
|
|
cmd_set_record_btrace_cpu_auto (const char *args, int from_tty)
|
|
{
|
|
if (args != nullptr && *args != 0)
|
|
error (_("Trailing junk: '%s'."), args);
|
|
|
|
record_btrace_cpu_state = CS_AUTO;
|
|
}
|
|
|
|
/* The "set record btrace cpu" command. */
|
|
|
|
static void
|
|
cmd_set_record_btrace_cpu (const char *args, int from_tty)
|
|
{
|
|
if (args == nullptr)
|
|
args = "";
|
|
|
|
/* We use a hard-coded vendor string for now. */
|
|
unsigned int family, model, stepping;
|
|
int l1, l2, matches = sscanf (args, "intel: %u/%u%n/%u%n", &family,
|
|
&model, &l1, &stepping, &l2);
|
|
if (matches == 3)
|
|
{
|
|
if (strlen (args) != l2)
|
|
error (_("Trailing junk: '%s'."), args + l2);
|
|
}
|
|
else if (matches == 2)
|
|
{
|
|
if (strlen (args) != l1)
|
|
error (_("Trailing junk: '%s'."), args + l1);
|
|
|
|
stepping = 0;
|
|
}
|
|
else
|
|
error (_("Bad format. See \"help set record btrace cpu\"."));
|
|
|
|
if (USHRT_MAX < family)
|
|
error (_("Cpu family too big."));
|
|
|
|
if (UCHAR_MAX < model)
|
|
error (_("Cpu model too big."));
|
|
|
|
if (UCHAR_MAX < stepping)
|
|
error (_("Cpu stepping too big."));
|
|
|
|
record_btrace_cpu.vendor = CV_INTEL;
|
|
record_btrace_cpu.family = family;
|
|
record_btrace_cpu.model = model;
|
|
record_btrace_cpu.stepping = stepping;
|
|
|
|
record_btrace_cpu_state = CS_CPU;
|
|
}
|
|
|
|
/* The "show record btrace cpu" command. */
|
|
|
|
static void
|
|
cmd_show_record_btrace_cpu (const char *args, int from_tty)
|
|
{
|
|
if (args != nullptr && *args != 0)
|
|
error (_("Trailing junk: '%s'."), args);
|
|
|
|
switch (record_btrace_cpu_state)
|
|
{
|
|
case CS_AUTO:
|
|
printf_unfiltered (_("btrace cpu is 'auto'.\n"));
|
|
return;
|
|
|
|
case CS_NONE:
|
|
printf_unfiltered (_("btrace cpu is 'none'.\n"));
|
|
return;
|
|
|
|
case CS_CPU:
|
|
switch (record_btrace_cpu.vendor)
|
|
{
|
|
case CV_INTEL:
|
|
if (record_btrace_cpu.stepping == 0)
|
|
printf_unfiltered (_("btrace cpu is 'intel: %u/%u'.\n"),
|
|
record_btrace_cpu.family,
|
|
record_btrace_cpu.model);
|
|
else
|
|
printf_unfiltered (_("btrace cpu is 'intel: %u/%u/%u'.\n"),
|
|
record_btrace_cpu.family,
|
|
record_btrace_cpu.model,
|
|
record_btrace_cpu.stepping);
|
|
return;
|
|
}
|
|
}
|
|
|
|
error (_("Internal error: bad cpu state."));
|
|
}
|
|
|
|
/* The "s record btrace bts" command. */
|
|
|
|
static void
|
|
cmd_set_record_btrace_bts (const char *args, int from_tty)
|
|
{
|
|
printf_unfiltered (_("\"set record btrace bts\" must be followed "
|
|
"by an appropriate subcommand.\n"));
|
|
help_list (set_record_btrace_bts_cmdlist, "set record btrace bts ",
|
|
all_commands, gdb_stdout);
|
|
}
|
|
|
|
/* The "show record btrace bts" command. */
|
|
|
|
static void
|
|
cmd_show_record_btrace_bts (const char *args, int from_tty)
|
|
{
|
|
cmd_show_list (show_record_btrace_bts_cmdlist, from_tty, "");
|
|
}
|
|
|
|
/* The "set record btrace pt" command. */
|
|
|
|
static void
|
|
cmd_set_record_btrace_pt (const char *args, int from_tty)
|
|
{
|
|
printf_unfiltered (_("\"set record btrace pt\" must be followed "
|
|
"by an appropriate subcommand.\n"));
|
|
help_list (set_record_btrace_pt_cmdlist, "set record btrace pt ",
|
|
all_commands, gdb_stdout);
|
|
}
|
|
|
|
/* The "show record btrace pt" command. */
|
|
|
|
static void
|
|
cmd_show_record_btrace_pt (const char *args, int from_tty)
|
|
{
|
|
cmd_show_list (show_record_btrace_pt_cmdlist, from_tty, "");
|
|
}
|
|
|
|
/* The "record bts buffer-size" show value function. */
|
|
|
|
static void
|
|
show_record_bts_buffer_size_value (struct ui_file *file, int from_tty,
|
|
struct cmd_list_element *c,
|
|
const char *value)
|
|
{
|
|
fprintf_filtered (file, _("The record/replay bts buffer size is %s.\n"),
|
|
value);
|
|
}
|
|
|
|
/* The "record pt buffer-size" show value function. */
|
|
|
|
static void
|
|
show_record_pt_buffer_size_value (struct ui_file *file, int from_tty,
|
|
struct cmd_list_element *c,
|
|
const char *value)
|
|
{
|
|
fprintf_filtered (file, _("The record/replay pt buffer size is %s.\n"),
|
|
value);
|
|
}
|
|
|
|
/* Initialize btrace commands. */
|
|
|
|
void
|
|
_initialize_record_btrace (void)
|
|
{
|
|
add_prefix_cmd ("btrace", class_obscure, cmd_record_btrace_start,
|
|
_("Start branch trace recording."), &record_btrace_cmdlist,
|
|
"record btrace ", 0, &record_cmdlist);
|
|
add_alias_cmd ("b", "btrace", class_obscure, 1, &record_cmdlist);
|
|
|
|
add_cmd ("bts", class_obscure, cmd_record_btrace_bts_start,
|
|
_("\
|
|
Start branch trace recording in Branch Trace Store (BTS) format.\n\n\
|
|
The processor stores a from/to record for each branch into a cyclic buffer.\n\
|
|
This format may not be available on all processors."),
|
|
&record_btrace_cmdlist);
|
|
add_alias_cmd ("bts", "btrace bts", class_obscure, 1, &record_cmdlist);
|
|
|
|
add_cmd ("pt", class_obscure, cmd_record_btrace_pt_start,
|
|
_("\
|
|
Start branch trace recording in Intel Processor Trace format.\n\n\
|
|
This format may not be available on all processors."),
|
|
&record_btrace_cmdlist);
|
|
add_alias_cmd ("pt", "btrace pt", class_obscure, 1, &record_cmdlist);
|
|
|
|
add_prefix_cmd ("btrace", class_support, cmd_set_record_btrace,
|
|
_("Set record options."), &set_record_btrace_cmdlist,
|
|
"set record btrace ", 0, &set_record_cmdlist);
|
|
|
|
add_prefix_cmd ("btrace", class_support, cmd_show_record_btrace,
|
|
_("Show record options."), &show_record_btrace_cmdlist,
|
|
"show record btrace ", 0, &show_record_cmdlist);
|
|
|
|
add_setshow_enum_cmd ("replay-memory-access", no_class,
|
|
replay_memory_access_types, &replay_memory_access, _("\
|
|
Set what memory accesses are allowed during replay."), _("\
|
|
Show what memory accesses are allowed during replay."),
|
|
_("Default is READ-ONLY.\n\n\
|
|
The btrace record target does not trace data.\n\
|
|
The memory therefore corresponds to the live target and not \
|
|
to the current replay position.\n\n\
|
|
When READ-ONLY, allow accesses to read-only memory during replay.\n\
|
|
When READ-WRITE, allow accesses to read-only and read-write memory during \
|
|
replay."),
|
|
NULL, cmd_show_replay_memory_access,
|
|
&set_record_btrace_cmdlist,
|
|
&show_record_btrace_cmdlist);
|
|
|
|
add_prefix_cmd ("cpu", class_support, cmd_set_record_btrace_cpu,
|
|
_("\
|
|
Set the cpu to be used for trace decode.\n\n\
|
|
The format is \"VENDOR:IDENTIFIER\" or \"none\" or \"auto\" (default).\n\
|
|
For vendor \"intel\" the format is \"FAMILY/MODEL[/STEPPING]\".\n\n\
|
|
When decoding branch trace, enable errata workarounds for the specified cpu.\n\
|
|
The default is \"auto\", which uses the cpu on which the trace was recorded.\n\
|
|
When GDB does not support that cpu, this option can be used to enable\n\
|
|
workarounds for a similar cpu that GDB supports.\n\n\
|
|
When set to \"none\", errata workarounds are disabled."),
|
|
&set_record_btrace_cpu_cmdlist,
|
|
"set record btrace cpu ", 1,
|
|
&set_record_btrace_cmdlist);
|
|
|
|
add_cmd ("auto", class_support, cmd_set_record_btrace_cpu_auto, _("\
|
|
Automatically determine the cpu to be used for trace decode."),
|
|
&set_record_btrace_cpu_cmdlist);
|
|
|
|
add_cmd ("none", class_support, cmd_set_record_btrace_cpu_none, _("\
|
|
Do not enable errata workarounds for trace decode."),
|
|
&set_record_btrace_cpu_cmdlist);
|
|
|
|
add_cmd ("cpu", class_support, cmd_show_record_btrace_cpu, _("\
|
|
Show the cpu to be used for trace decode."),
|
|
&show_record_btrace_cmdlist);
|
|
|
|
add_prefix_cmd ("bts", class_support, cmd_set_record_btrace_bts,
|
|
_("Set record btrace bts options."),
|
|
&set_record_btrace_bts_cmdlist,
|
|
"set record btrace bts ", 0, &set_record_btrace_cmdlist);
|
|
|
|
add_prefix_cmd ("bts", class_support, cmd_show_record_btrace_bts,
|
|
_("Show record btrace bts options."),
|
|
&show_record_btrace_bts_cmdlist,
|
|
"show record btrace bts ", 0, &show_record_btrace_cmdlist);
|
|
|
|
add_setshow_uinteger_cmd ("buffer-size", no_class,
|
|
&record_btrace_conf.bts.size,
|
|
_("Set the record/replay bts buffer size."),
|
|
_("Show the record/replay bts buffer size."), _("\
|
|
When starting recording request a trace buffer of this size. \
|
|
The actual buffer size may differ from the requested size. \
|
|
Use \"info record\" to see the actual buffer size.\n\n\
|
|
Bigger buffers allow longer recording but also take more time to process \
|
|
the recorded execution trace.\n\n\
|
|
The trace buffer size may not be changed while recording."), NULL,
|
|
show_record_bts_buffer_size_value,
|
|
&set_record_btrace_bts_cmdlist,
|
|
&show_record_btrace_bts_cmdlist);
|
|
|
|
add_prefix_cmd ("pt", class_support, cmd_set_record_btrace_pt,
|
|
_("Set record btrace pt options."),
|
|
&set_record_btrace_pt_cmdlist,
|
|
"set record btrace pt ", 0, &set_record_btrace_cmdlist);
|
|
|
|
add_prefix_cmd ("pt", class_support, cmd_show_record_btrace_pt,
|
|
_("Show record btrace pt options."),
|
|
&show_record_btrace_pt_cmdlist,
|
|
"show record btrace pt ", 0, &show_record_btrace_cmdlist);
|
|
|
|
add_setshow_uinteger_cmd ("buffer-size", no_class,
|
|
&record_btrace_conf.pt.size,
|
|
_("Set the record/replay pt buffer size."),
|
|
_("Show the record/replay pt buffer size."), _("\
|
|
Bigger buffers allow longer recording but also take more time to process \
|
|
the recorded execution.\n\
|
|
The actual buffer size may differ from the requested size. Use \"info record\" \
|
|
to see the actual buffer size."), NULL, show_record_pt_buffer_size_value,
|
|
&set_record_btrace_pt_cmdlist,
|
|
&show_record_btrace_pt_cmdlist);
|
|
|
|
add_target (record_btrace_target_info, record_btrace_target_open);
|
|
|
|
bfcache = htab_create_alloc (50, bfcache_hash, bfcache_eq, NULL,
|
|
xcalloc, xfree);
|
|
|
|
record_btrace_conf.bts.size = 64 * 1024;
|
|
record_btrace_conf.pt.size = 16 * 1024;
|
|
}
|