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/* backtrace.c - Gather a backtrace.
Copyright (C) 2008 Free Software Foundation, Inc.
Written by Neal H. Walfield <neal@gnu.org>.
The GNU Hurd is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 3 of the
License, or (at your option) any later version.
The GNU Hurd is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see
<http://www.gnu.org/licenses/>. */
#include <s-printf.h>
#ifndef RM_INTERN
# include <hurd/thread.h>
#endif
#ifdef USE_L4
# include <l4.h>
#endif
#ifdef RM_INTERN
# define RA(level) \
if (level < size && __builtin_frame_address ((level) + 1)) \
{ \
array[level] = __builtin_return_address ((level) + 1); \
if (array[level] == 0) \
return count; \
count ++; \
} \
else \
return count;
#else
# include <hurd/thread.h>
# include <setjmp.h>
# define RA(level) \
if (count >= size) \
return count; \
\
{ \
void *fa = __builtin_frame_address ((level) + 1); \
if (fa) \
{ \
if (utcb) \
{ \
catcher.start = (uintptr_t) fa + displacement; \
catcher.len = sizeof (uintptr_t); \
catcher.callback = get_me_outda_here; \
\
hurd_fault_catcher_register (&catcher); \
} \
\
array[count] = __builtin_return_address ((level) + 1); \
\
if (utcb) \
hurd_fault_catcher_unregister (&catcher); \
\
if (array[count] == 0) \
return count; \
count ++; \
} \
else \
return count; \
}
#endif
int
backtrace (void **array, int size)
{
/* Without the volatile, count ends up either optimized away or in a
caller saved register before the setjmp. In either case, if we
fault, we'll end up returning 0 even if we get some of the
backtrace. volatile seems to prevent this. */
volatile int count = 0;
#ifndef RM_INTERN
/* The location of the return address relative to the start of a
frame. */
intptr_t displacement = sizeof (uintptr_t);
# ifndef i386
# warning Not ported to this architecture... guessing
# endif
jmp_buf jmpbuf;
/* If we don't yet have a utcb then don't set up a fault catcher. */
struct vg_utcb *utcb = hurd_utcb ();
if (utcb)
{
if (setjmp (jmpbuf))
return count;
}
struct hurd_fault_catcher catcher;
bool get_me_outda_here (struct activation_frame *af, uintptr_t fault)
{
hurd_fault_catcher_unregister (&catcher);
hurd_activation_frame_longjmp (af, jmpbuf, true, 1);
return true;
}
#endif
RA(0);
RA(1);
RA(2);
RA(3);
RA(4);
RA(5);
RA(6);
RA(7);
RA(9);
RA(10);
RA(11);
RA(12);
RA(13);
RA(14);
RA(15);
RA(16);
RA(17);
RA(18);
RA(19);
RA(20);
return count;
}
void
backtrace_print (void)
{
void *bt[20];
int count = backtrace (bt, sizeof (bt) / sizeof (bt[0]));
#ifdef USE_L4
s_printf ("Backtrace for %x: ", l4_myself ());
#else
# ifndef RM_INTERN
s_printf ("Backtrace for %x: ", hurd_myself ());
# else
# warning Don't know how to get tid.
s_printf ("Backtrace: ");
# endif
#endif
int i;
for (i = 0; i < count; i ++)
s_printf ("%p ", bt[i]);
s_printf ("\n");
}
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