130 lines
3.7 KiB
C
130 lines
3.7 KiB
C
/* backtrace.c -- Entry point for stack backtrace library.
|
|
Copyright (C) 2012-2020 Free Software Foundation, Inc.
|
|
Written by Ian Lance Taylor, Google.
|
|
|
|
Redistribution and use in source and binary forms, with or without
|
|
modification, are permitted provided that the following conditions are
|
|
met:
|
|
|
|
(1) Redistributions of source code must retain the above copyright
|
|
notice, this list of conditions and the following disclaimer.
|
|
|
|
(2) Redistributions in binary form must reproduce the above copyright
|
|
notice, this list of conditions and the following disclaimer in
|
|
the documentation and/or other materials provided with the
|
|
distribution.
|
|
|
|
(3) The name of the author may not be used to
|
|
endorse or promote products derived from this software without
|
|
specific prior written permission.
|
|
|
|
THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
|
|
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
|
|
DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
|
|
INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
|
|
(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
|
|
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
|
STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
|
|
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
|
|
POSSIBILITY OF SUCH DAMAGE. */
|
|
|
|
#include "config.h"
|
|
|
|
#include <sys/types.h>
|
|
|
|
#include "unwind.h"
|
|
#include "backtrace.h"
|
|
#include "internal.h"
|
|
|
|
/* The main backtrace_full routine. */
|
|
|
|
/* Data passed through _Unwind_Backtrace. */
|
|
|
|
struct backtrace_data
|
|
{
|
|
/* Number of frames to skip. */
|
|
int skip;
|
|
/* Library state. */
|
|
struct backtrace_state *state;
|
|
/* Callback routine. */
|
|
backtrace_full_callback callback;
|
|
/* Error callback routine. */
|
|
backtrace_error_callback error_callback;
|
|
/* Data to pass to callback routines. */
|
|
void *data;
|
|
/* Value to return from backtrace_full. */
|
|
int ret;
|
|
/* Whether there is any memory available. */
|
|
int can_alloc;
|
|
};
|
|
|
|
/* Unwind library callback routine. This is passed to
|
|
_Unwind_Backtrace. */
|
|
|
|
static _Unwind_Reason_Code
|
|
unwind (struct _Unwind_Context *context, void *vdata)
|
|
{
|
|
struct backtrace_data *bdata = (struct backtrace_data *) vdata;
|
|
uintptr_t pc;
|
|
int ip_before_insn = 0;
|
|
|
|
#ifdef HAVE_GETIPINFO
|
|
pc = _Unwind_GetIPInfo (context, &ip_before_insn);
|
|
#else
|
|
pc = _Unwind_GetIP (context);
|
|
#endif
|
|
|
|
if (bdata->skip > 0)
|
|
{
|
|
--bdata->skip;
|
|
return _URC_NO_REASON;
|
|
}
|
|
|
|
if (!ip_before_insn)
|
|
--pc;
|
|
|
|
if (!bdata->can_alloc)
|
|
bdata->ret = bdata->callback (bdata->data, pc, NULL, 0, NULL);
|
|
else
|
|
bdata->ret = backtrace_pcinfo (bdata->state, pc, bdata->callback,
|
|
bdata->error_callback, bdata->data);
|
|
if (bdata->ret != 0)
|
|
return _URC_END_OF_STACK;
|
|
|
|
return _URC_NO_REASON;
|
|
}
|
|
|
|
/* Get a stack backtrace. */
|
|
|
|
int __attribute__((noinline))
|
|
backtrace_full (struct backtrace_state *state, int skip,
|
|
backtrace_full_callback callback,
|
|
backtrace_error_callback error_callback, void *data)
|
|
{
|
|
struct backtrace_data bdata;
|
|
void *p;
|
|
|
|
bdata.skip = skip + 1;
|
|
bdata.state = state;
|
|
bdata.callback = callback;
|
|
bdata.error_callback = error_callback;
|
|
bdata.data = data;
|
|
bdata.ret = 0;
|
|
|
|
/* If we can't allocate any memory at all, don't try to produce
|
|
file/line information. */
|
|
p = backtrace_alloc (state, 4096, NULL, NULL);
|
|
if (p == NULL)
|
|
bdata.can_alloc = 0;
|
|
else
|
|
{
|
|
backtrace_free (state, p, 4096, NULL, NULL);
|
|
bdata.can_alloc = 1;
|
|
}
|
|
|
|
_Unwind_Backtrace (unwind, &bdata);
|
|
return bdata.ret;
|
|
}
|