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Add support for catching exec events on FreeBSD.

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FreeBSD kernels that support fork tracing always stop a process to
report events for exec.  Such a process will have the PL_FLAG_EXEC
flag set in the pl_flags field of the ptrace_lwpinfo struct returned
by PT_LWPINFO.  The structure does not include the pathname passed to
exec, so use fbsd_pid_to_exec_file to query the pathname of the
process' executable.

gdb/ChangeLog:

	* fbsd-nat.c: (fbsd_wait) [PL_FLAG_EXEC]: Report TARGET_WAITKIND_EXECD
	event if PL_FLAG_EXEC is set.
	[PL_FLAG_EXEC] (fbsd_insert_exec_catchpoint): New function.
	[PL_FLAG_EXEC] (fbsd_remove_exec_catchpoint): New function.
	(fbsd_nat_add_target) [PL_FLAG_EXEC]: Set
	"to_insert_exec_catchpoint" to "fbsd_insert_exec_catchpoint".
	Set "to_remove_exec_catchpoint" to "fbsd_remove_exec_catchpoint".
This commit is contained in:
John Baldwin 2015-04-18 01:00:06 -04:00
parent e58e05d677
commit d2b41ca0f9
2 changed files with 41 additions and 0 deletions
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10
gdb/ChangeLog
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@ -1,3 +1,13 @@
2015-04-27 John Baldwin <jhb@FreeBSD.org>
* fbsd-nat.c: (fbsd_wait) [PL_FLAG_EXEC]: Report TARGET_WAITKIND_EXECD
event if PL_FLAG_EXEC is set.
[PL_FLAG_EXEC] (fbsd_insert_exec_catchpoint): New function.
[PL_FLAG_EXEC] (fbsd_remove_exec_catchpoint): New function.
(fbsd_nat_add_target) [PL_FLAG_EXEC]: Set
"to_insert_exec_catchpoint" to "fbsd_insert_exec_catchpoint".
Set "to_remove_exec_catchpoint" to "fbsd_remove_exec_catchpoint".
2015-04-27 John Baldwin <jhb@FreeBSD.org>
* fbsd-nat.c: [PT_LWPINFO] New variable super_wait.

31
gdb/fbsd-nat.c
View File

@ -376,6 +376,16 @@ fbsd_wait (struct target_ops *ops,
continue;
}
#endif
#ifdef PL_FLAG_EXEC
if (pl.pl_flags & PL_FLAG_EXEC)
{
ourstatus->kind = TARGET_WAITKIND_EXECD;
ourstatus->value.execd_pathname
= xstrdup (fbsd_pid_to_exec_file (NULL, pid));
return wptid;
}
#endif
}
return wptid;
}
@ -458,6 +468,23 @@ fbsd_post_attach (struct target_ops *self, int pid)
fbsd_enable_follow_fork (pid);
}
#endif
#ifdef PL_FLAG_EXEC
/* If the FreeBSD kernel supports PL_FLAG_EXEC, then traced processes
will always stop after exec. */
static int
fbsd_insert_exec_catchpoint (struct target_ops *self, int pid)
{
return 0;
}
static int
fbsd_remove_exec_catchpoint (struct target_ops *self, int pid)
{
return 0;
}
#endif
#endif
void
@ -477,6 +504,10 @@ fbsd_nat_add_target (struct target_ops *t)
t->to_post_startup_inferior = fbsd_post_startup_inferior;
t->to_post_attach = fbsd_post_attach;
#endif
#ifdef PL_FLAG_EXEC
t->to_insert_exec_catchpoint = fbsd_insert_exec_catchpoint;
t->to_remove_exec_catchpoint = fbsd_remove_exec_catchpoint;
#endif
#endif
add_target (t);
}