Add iterate_over_lwps to gdbserver
This commit introduces a new function, iterate_over_lwps, that shared Linux code can use to call a function for each LWP that matches certain criteria. This function already existed in GDB and was in use by GDB's various low-level Linux x86 debug register setters. An equivalent was written for gdbserver and gdbserver's low-level Linux x86 debug register setters were modified to use it. gdb/ChangeLog: * linux-nat.h: Include nat/linux-nat.h. (iterate_over_lwps): Move declaration to nat/linux-nat.h. * nat/linux-nat.h (struct lwp_info): New forward declaration. (iterate_over_lwps_ftype): New typedef. (iterate_over_lwps): New declaration. * linux-nat.h (iterate_over_lwps): Update comment. Use iterate_over_lwps_ftype. Update callback return value check. gdb/gdbserver/ChangeLog: * linux-low.h: Include nat/linux-nat.h. * linux-low.c (iterate_over_lwps_args): New structure. (iterate_over_lwps_filter): New function. (iterate_over_lwps): Likewise. * linux-x86-low.c (update_debug_registers_callback): Update signature to what iterate_over_lwps expects. Remove PID check that iterate_over_lwps now performs. (x86_dr_low_set_addr): Use iterate_over_lwps. (x86_dr_low_set_control): Likewise.
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@ -1,3 +1,13 @@
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2015-03-24 Gary Benson <gbenson@redhat.com>
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* linux-nat.h: Include nat/linux-nat.h.
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(iterate_over_lwps): Move declaration to nat/linux-nat.h.
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* nat/linux-nat.h (struct lwp_info): New forward declaration.
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(iterate_over_lwps_ftype): New typedef.
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(iterate_over_lwps): New declaration.
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* linux-nat.h (iterate_over_lwps): Update comment. Use
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iterate_over_lwps_ftype. Update callback return value check.
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2015-03-24 Gary Benson <gbenson@redhat.com>
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* x86-nat.h (x86_debug_reg_state): Move declaration to...
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@ -1,3 +1,15 @@
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2015-03-24 Gary Benson <gbenson@redhat.com>
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* linux-low.h: Include nat/linux-nat.h.
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* linux-low.c (iterate_over_lwps_args): New structure.
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(iterate_over_lwps_filter): New function.
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(iterate_over_lwps): Likewise.
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* linux-x86-low.c (update_debug_registers_callback):
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Update signature to what iterate_over_lwps expects.
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Remove PID check that iterate_over_lwps now performs.
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(x86_dr_low_set_addr): Use iterate_over_lwps.
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(x86_dr_low_set_control): Likewise.
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2015-03-24 Gary Benson <gbenson@redhat.com>
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* linux-x86-low.c (x86_debug_reg_state): New function.
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@ -1397,6 +1397,60 @@ num_lwps (int pid)
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return count;
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}
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/* The arguments passed to iterate_over_lwps. */
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struct iterate_over_lwps_args
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{
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/* The FILTER argument passed to iterate_over_lwps. */
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ptid_t filter;
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/* The CALLBACK argument passed to iterate_over_lwps. */
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iterate_over_lwps_ftype *callback;
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/* The DATA argument passed to iterate_over_lwps. */
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void *data;
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};
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/* Callback for find_inferior used by iterate_over_lwps to filter
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calls to the callback supplied to that function. Returning a
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nonzero value causes find_inferiors to stop iterating and return
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the current inferior_list_entry. Returning zero indicates that
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find_inferiors should continue iterating. */
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static int
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iterate_over_lwps_filter (struct inferior_list_entry *entry, void *args_p)
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{
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struct iterate_over_lwps_args *args
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= (struct iterate_over_lwps_args *) args_p;
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if (ptid_match (entry->id, args->filter))
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{
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struct thread_info *thr = (struct thread_info *) entry;
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struct lwp_info *lwp = get_thread_lwp (thr);
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return (*args->callback) (lwp, args->data);
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}
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return 0;
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}
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/* See nat/linux-nat.h. */
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struct lwp_info *
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iterate_over_lwps (ptid_t filter,
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iterate_over_lwps_ftype callback,
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void *data)
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{
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struct iterate_over_lwps_args args = {filter, callback, data};
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struct inferior_list_entry *entry;
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entry = find_inferior (&all_threads, iterate_over_lwps_filter, &args);
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if (entry == NULL)
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return NULL;
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return get_thread_lwp ((struct thread_info *) entry);
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}
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/* Detect zombie thread group leaders, and "exit" them. We can't reap
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their exits until all other threads in the group have exited. */
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@ -16,6 +16,7 @@
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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 "nat/linux-nat.h"
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#include "nat/gdb_thread_db.h"
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#include <signal.h>
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@ -575,25 +575,16 @@ x86_linux_dr_set (ptid_t ptid, int regnum, unsigned long value)
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}
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static int
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update_debug_registers_callback (struct inferior_list_entry *entry,
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void *pid_p)
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update_debug_registers_callback (struct lwp_info *lwp, void *arg)
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{
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struct thread_info *thr = (struct thread_info *) entry;
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struct lwp_info *lwp = get_thread_lwp (thr);
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int pid = *(int *) pid_p;
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/* The actual update is done later just before resuming the lwp,
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we just mark that the registers need updating. */
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lwp->arch_private->debug_registers_changed = 1;
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/* Only update the threads of this process. */
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if (pid_of (thr) == pid)
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{
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/* The actual update is done later just before resuming the lwp,
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we just mark that the registers need updating. */
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lwp->arch_private->debug_registers_changed = 1;
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/* If the lwp isn't stopped, force it to momentarily pause, so
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we can update its debug registers. */
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if (!lwp->stopped)
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linux_stop_lwp (lwp);
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}
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/* If the lwp isn't stopped, force it to momentarily pause, so
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we can update its debug registers. */
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if (!lwp->stopped)
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linux_stop_lwp (lwp);
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return 0;
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}
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@ -604,11 +595,11 @@ static void
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x86_dr_low_set_addr (int regnum, CORE_ADDR addr)
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{
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/* Only update the threads of this process. */
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int pid = pid_of (current_thread);
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ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (current_lwp_ptid ()));
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gdb_assert (DR_FIRSTADDR <= regnum && regnum <= DR_LASTADDR);
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find_inferior (&all_threads, update_debug_registers_callback, &pid);
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iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL);
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}
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/* Return the inferior's debug register REGNUM. */
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@ -627,9 +618,9 @@ static void
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x86_dr_low_set_control (unsigned long control)
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{
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/* Only update the threads of this process. */
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int pid = pid_of (current_thread);
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ptid_t pid_ptid = pid_to_ptid (ptid_get_pid (current_lwp_ptid ()));
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find_inferior (&all_threads, update_debug_registers_callback, &pid);
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iterate_over_lwps (pid_ptid, update_debug_registers_callback, NULL);
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}
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/* Return the inferior's DR7 debug control register. */
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@ -834,14 +834,11 @@ find_lwp_pid (ptid_t ptid)
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return NULL;
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}
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/* Call CALLBACK with its second argument set to DATA for every LWP in
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the list. If CALLBACK returns 1 for a particular LWP, return a
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pointer to the structure describing that LWP immediately.
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Otherwise return NULL. */
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/* See nat/linux-nat.h. */
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struct lwp_info *
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iterate_over_lwps (ptid_t filter,
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int (*callback) (struct lwp_info *, void *),
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iterate_over_lwps_ftype callback,
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void *data)
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{
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struct lwp_info *lp, *lpnext;
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@ -852,7 +849,7 @@ iterate_over_lwps (ptid_t filter,
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if (ptid_match (lp->ptid, filter))
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{
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if ((*callback) (lp, data))
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if ((*callback) (lp, data) != 0)
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return lp;
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}
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}
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@ -17,8 +17,8 @@
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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 "nat/linux-nat.h"
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#include "target.h"
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#include <signal.h>
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struct arch_lwp_info;
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@ -151,12 +151,6 @@ extern void linux_stop_and_wait_all_lwps (void);
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left stopped.) */
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extern void linux_unstop_all_lwps (void);
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/* Iterator function for lin-lwp's lwp list. */
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struct lwp_info *iterate_over_lwps (ptid_t filter,
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int (*callback) (struct lwp_info *,
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void *),
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void *data);
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/* Create a prototype generic GNU/Linux target. The client can
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override it with local methods. */
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struct target_ops * linux_target (void);
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#ifndef LINUX_NAT_H
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#define LINUX_NAT_H
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struct lwp_info;
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/* Unlike other extended result codes, WSTOPSIG (status) on
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PTRACE_O_TRACESYSGOOD syscall events doesn't return SIGTRAP, but
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instead SIGTRAP with bit 7 set. */
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@ -32,4 +34,17 @@
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extern ptid_t current_lwp_ptid (void);
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/* Function type for the CALLBACK argument of iterate_over_lwps. */
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typedef int (iterate_over_lwps_ftype) (struct lwp_info *lwp, void *arg);
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/* Iterate over all LWPs. Calls CALLBACK with its second argument set
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to DATA for every LWP in the list. If CALLBACK returns nonzero for
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a particular LWP, return a pointer to the structure describing that
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LWP immediately. Otherwise return NULL. This function must be
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provided by the client. */
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extern struct lwp_info *iterate_over_lwps (ptid_t filter,
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iterate_over_lwps_ftype callback,
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void *data);
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#endif /* LINUX_NAT_H */
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