2023-01-06 21:08:04 +00:00
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/* Copyright (C) 2005-2023 Free Software Foundation, Inc.
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2012-01-10 05:38:42 +00:00
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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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Prefer https to http for gnu.org and fsf.org URLs
Also, change sources.redhat.com to sourceware.org.
This patch was automatically generated by running the following shell
script, which uses GNU sed, and which avoids modifying files imported
from upstream:
sed -ri '
s,(http|ftp)(://(.*\.)?(gnu|fsf|sourceware)\.org($|[^.]|\.[^a-z])),https\2,g
s,(http|ftp)(://(.*\.)?)sources\.redhat\.com($|[^.]|\.[^a-z]),https\2sourceware.org\4,g
' \
$(find $(git ls-files) -prune -type f \
! -name '*.po' \
! -name 'ChangeLog*' \
! -path COPYING ! -path COPYING.LIB \
! -path manual/fdl-1.3.texi ! -path manual/lgpl-2.1.texi \
! -path manual/texinfo.tex ! -path scripts/config.guess \
! -path scripts/config.sub ! -path scripts/install-sh \
! -path scripts/mkinstalldirs ! -path scripts/move-if-change \
! -path INSTALL ! -path locale/programs/charmap-kw.h \
! -path po/libc.pot ! -path sysdeps/gnu/errlist.c \
! '(' -name configure \
-execdir test -f configure.ac -o -f configure.in ';' ')' \
! '(' -name preconfigure \
-execdir test -f preconfigure.ac ';' ')' \
-print)
and then by running 'make dist-prepare' to regenerate files built
from the altered files, and then executing the following to cleanup:
chmod a+x sysdeps/unix/sysv/linux/riscv/configure
# Omit irrelevant whitespace and comment-only changes,
# perhaps from a slightly-different Autoconf version.
git checkout -f \
sysdeps/csky/configure \
sysdeps/hppa/configure \
sysdeps/riscv/configure \
sysdeps/unix/sysv/linux/csky/configure
# Omit changes that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/powerpc/powerpc64/ppc-mcount.S: trailing lines
git checkout -f \
sysdeps/powerpc/powerpc64/ppc-mcount.S \
sysdeps/unix/sysv/linux/s390/s390-64/syscall.S
# Omit change that caused a pre-commit check to fail like this:
# remote: *** error: sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S: last line does not end in newline
git checkout -f sysdeps/sparc/sparc64/multiarch/memcpy-ultra3.S
2019-09-07 05:40:42 +00:00
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<https://www.gnu.org/licenses/>. */
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2012-01-10 05:38:42 +00:00
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#include <stdio.h>
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2020-02-04 13:29:04 +00:00
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#include <stdlib.h>
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2012-01-10 05:38:42 +00:00
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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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2017-01-04 01:06:04 +00:00
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static inline long
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2012-01-10 05:38:42 +00:00
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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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2015-08-15 18:42:43 +00:00
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if (size <= 0)
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return 0;
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2012-01-10 05:38:42 +00:00
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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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