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143 lines
3.6 KiB
C
143 lines
3.6 KiB
C
/* Copyright (C) 2005-2015 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <string.h>
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#include <sysdep.h>
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#include <signal.h>
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#include <execinfo.h>
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extern int
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_identify_sighandler (unsigned long fp, unsigned long pc,
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unsigned long *pprev_fp, unsigned long *pprev_pc,
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unsigned long *retaddr);
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inline long
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get_frame_size (unsigned long instr)
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{
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return abs ((short signed) (instr & 0xFFFF));
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}
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static unsigned long *
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find_frame_creation (unsigned long *pc)
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{
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int i;
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/* NOTE: Distance to search is arbitrary.
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250 works well for most things,
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750 picks up things like tcp_recvmsg,
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1000 needed for fat_fill_super. */
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for (i = 0; i < 1000; i++, pc--)
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{
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unsigned long instr;
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unsigned long frame_size;
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instr = *pc;
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/* Is the instruction of the form
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addik r1, r1, foo ? */
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if ((instr & 0xFFFF0000) != 0x30210000)
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continue;
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frame_size = get_frame_size (instr);
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if ((frame_size < 8) || (frame_size & 3))
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return NULL;
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return pc;
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}
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return NULL;
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}
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static int
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lookup_prev_stack_frame (unsigned long fp, unsigned long pc,
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unsigned long *pprev_fp, unsigned long *pprev_pc,
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unsigned long *retaddr)
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{
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unsigned long *prologue = NULL;
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int is_signalhandler = _identify_sighandler (fp, pc, pprev_fp,
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pprev_pc, retaddr);
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if (!is_signalhandler)
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{
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prologue = find_frame_creation ((unsigned long *) pc);
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if (prologue)
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{
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long frame_size = get_frame_size (*prologue);
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*pprev_fp = fp + frame_size;
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if (*retaddr != 0)
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*pprev_pc = *retaddr;
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else
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*pprev_pc = *(unsigned long *) fp;
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*retaddr = 0;
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if (!*pprev_pc || (*pprev_pc & 3))
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prologue=0;
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}
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else
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{
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*pprev_pc = 0;
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*pprev_fp = fp;
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*retaddr = 0;
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}
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}
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return (!*pprev_pc || (*pprev_pc & 3)) ? -1 : 0;
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}
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int
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__backtrace (void **array, int size)
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{
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unsigned long pc, fp;
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unsigned long ppc, pfp;
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/* Return address(r15) is required in the signal handler case, since the
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return address of the function which causes the signal may not be
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recorded in the stack. */
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unsigned long retaddr;
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int count;
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int rc = 0;
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if (size <= 0)
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return 0;
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__asm__ __volatile__ ("mfs %0, rpc"
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: "=r"(pc));
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__asm__ __volatile__ ("add %0, r1, r0"
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: "=r"(fp));
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array[0] = (void *) pc;
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retaddr = 0;
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for (count = 1; count < size; count++)
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{
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rc = lookup_prev_stack_frame (fp, pc, &pfp, &ppc, &retaddr);
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fp = pfp;
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pc = ppc;
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array[count] = (void *) pc;
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if (rc)
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return count;
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}
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return count;
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}
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weak_alias (__backtrace, backtrace)
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libc_hidden_def (__backtrace)
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