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* infrun.c (wait_for_inferior): When switching from one thread to 

another, save infrun's state for the old thread and load infrun's
        previous state for the new thread.
        * thread.c (struct thread_info): Add new fields for thread specific
        state saved/restored in infrun.c.
        (add_thread): Initialize new fields.
        (load_infrun_state): New function.
        (save_infrun_state): New function.
        * thread.h (load_infrun_state): Provide external decl.
        (save_infrun_state): Likewise.

More single-stepping patches for lynx-6100.
gdb-4_18-branch
Jeff Law 32 years ago
parent
7158d2b1a3
commit
88a294b1b7
3 changed files with 125 additions and 0 deletions
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  1. 11
      gdb/ChangeLog
  2. 104
      gdb/thread.c
  3. 10
      gdb/thread.h

11
gdb/ChangeLog
View File

@ -1,5 +1,16 @@
Tue Jul 4 10:30:22 1995 Jeffrey A. Law <law@rtl.cygnus.com>
* infrun.c (wait_for_inferior): When switching from one thread to
another, save infrun's state for the old thread and load infrun's
previous state for the new thread.
* thread.c (struct thread_info): Add new fields for thread specific
state saved/restored in infrun.c.
(add_thread): Initialize new fields.
(load_infrun_state): New function.
(save_infrun_state): New function.
* thread.h (load_infrun_state): Provide external decl.
(save_infrun_state): Likewise.
* infrun.c (wait_for_inferior): When we hit a breakpoint for the
wrong thread, make sure to write the fixed PC value into the thread
that stopped. Restart all threads after single stepping over a

104
gdb/thread.c
View File

@ -42,6 +42,17 @@ struct thread_info
struct thread_info *next;
int pid; /* Actual process id */
int num; /* Convenient handle */
CORE_ADDR prev_pc; /* State from wait_for_inferior */
CORE_ADDR prev_func_start;
char *prev_func_name;
struct breakpoint *step_resume_breakpoint;
struct breakpoint *through_sigtramp_breakpoint;
CORE_ADDR step_range_start;
CORE_ADDR step_range_end;
CORE_ADDR step_frame_address;
int trap_expected;
int handling_longjmp;
int another_trap;
};
static struct thread_info *thread_list = NULL;
@ -83,6 +94,17 @@ add_thread (pid)
tp->pid = pid;
tp->num = ++highest_thread_num;
tp->prev_pc = 0;
tp->prev_func_start = 0;
tp->prev_func_name = NULL;
tp->step_range_start = 0;
tp->step_range_end = 0;
tp->step_frame_address =0;
tp->step_resume_breakpoint = 0;
tp->through_sigtramp_breakpoint = 0;
tp->handling_longjmp = 0;
tp->trap_expected = 0;
tp->another_trap = 0;
tp->next = thread_list;
thread_list = tp;
}
@ -139,6 +161,88 @@ in_thread_list (pid)
return 0; /* Never heard of 'im */
}
/* Load infrun state for the thread PID. */
void load_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
trap_expected, step_resume_breakpoint,
through_sigtramp_breakpoint, step_range_start,
step_range_end, step_frame_address,
handling_longjmp, another_trap)
int pid;
CORE_ADDR *prev_pc;
CORE_ADDR *prev_func_start;
char **prev_func_name;
int *trap_expected;
struct breakpoint **step_resume_breakpoint;
struct breakpoint **through_sigtramp_breakpoint;
CORE_ADDR *step_range_start;
CORE_ADDR *step_range_end;
CORE_ADDR *step_frame_address;
int *handling_longjmp;
int *another_trap;
{
struct thread_info *tp;
/* If we can't find the thread, then we're debugging a single threaded
process. No need to do anything in that case. */
tp = find_thread_id (pid_to_thread_id (pid));
if (tp == NULL)
return;
*prev_pc = tp->prev_pc;
*prev_func_start = tp->prev_func_start;
*prev_func_name = tp->prev_func_name;
*step_resume_breakpoint = tp->step_resume_breakpoint;
*step_range_start = tp->step_range_start;
*step_range_end = tp->step_range_end;
*step_frame_address = tp->step_frame_address;
*through_sigtramp_breakpoint = tp->through_sigtramp_breakpoint;
*handling_longjmp = tp->handling_longjmp;
*trap_expected = tp->trap_expected;
*another_trap = tp->another_trap;
}
/* Save infrun state for the thread PID. */
void save_infrun_state (pid, prev_pc, prev_func_start, prev_func_name,
trap_expected, step_resume_breakpoint,
through_sigtramp_breakpoint, step_range_start,
step_range_end, step_frame_address,
handling_longjmp, another_trap)
int pid;
CORE_ADDR prev_pc;
CORE_ADDR prev_func_start;
char *prev_func_name;
int trap_expected;
struct breakpoint *step_resume_breakpoint;
struct breakpoint *through_sigtramp_breakpoint;
CORE_ADDR step_range_start;
CORE_ADDR step_range_end;
CORE_ADDR step_frame_address;
int handling_longjmp;
int another_trap;
{
struct thread_info *tp;
/* If we can't find the thread, then we're debugging a single-threaded
process. Nothing to do in that case. */
tp = find_thread_id (pid_to_thread_id (pid));
if (tp == NULL)
return;
tp->prev_pc = prev_pc;
tp->prev_func_start = prev_func_start;
tp->prev_func_name = prev_func_name;
tp->step_resume_breakpoint = step_resume_breakpoint;
tp->step_range_start = step_range_start;
tp->step_range_end = step_range_end;
tp->step_frame_address = step_frame_address;
tp->through_sigtramp_breakpoint = through_sigtramp_breakpoint;
tp->handling_longjmp = handling_longjmp;
tp->trap_expected = trap_expected;
tp->another_trap = another_trap;
}
static void
prune_threads ()
{

10
gdb/thread.h
View File

@ -33,4 +33,14 @@ extern int pid_to_thread_id PARAMS ((int pid));
extern int valid_thread_id PARAMS ((int thread));
extern void load_infrun_state PARAMS ((int, CORE_ADDR *, CORE_ADDR *, char **,
int *, struct breakpoint **,
struct breakpoint **, CORE_ADDR *,
CORE_ADDR *, CORE_ADDR *, int *, int *));
extern void save_infrun_state PARAMS ((int, CORE_ADDR, CORE_ADDR, char *,
int, struct breakpoint *,
struct breakpoint *, CORE_ADDR,
CORE_ADDR, CORE_ADDR, int, int));
#endif /* THREAD_H */

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