From 2de7874e55b344d5270abc8832950cf09c6d7dd7 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Mon, 8 Jun 1998 19:06:31 +0000 Subject: Update. 1998-06-08 18:57 Ulrich Drepper * Makeconfig (subdirs): Add debug. * configure.in: Use sysdeps/generic/elf subdir if ELF platform. * libc.map: Add __backtrace, __backtrace_symbols, backtrace and backtrace_symbols. * sysdeps/generic/backtrace.c: New file. * sysdeps/generic/backtracesyms.c: New file. * sysdeps/generic/elf/backtracesyms.c: New file. * sysdeps/i386/backtrace.c: New file. * debug/Makefile: New file. * debug/backtrace-tst.c: New file. * debug/execinfo.h: New file. --- sysdeps/i386/backtrace.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 63 insertions(+) create mode 100644 sysdeps/i386/backtrace.c (limited to 'sysdeps/i386/backtrace.c') diff --git a/sysdeps/i386/backtrace.c b/sysdeps/i386/backtrace.c new file mode 100644 index 0000000000..0d484c7723 --- /dev/null +++ b/sysdeps/i386/backtrace.c @@ -0,0 +1,63 @@ +/* Return backtrace of current program state. + Copyright (C) 1998 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper , 1998. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Library General Public License as + published by the Free Software Foundation; either version 2 of the + License, or (at your option) any later version. + + The GNU C Library 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 + Library General Public License for more details. + + You should have received a copy of the GNU Library General Public + License along with the GNU C Library; see the file COPYING.LIB. If not, + write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, + Boston, MA 02111-1307, USA. */ + +#include + + +/* This is the stack alyout we see with every stack frame. + + +-----------------+ +-----------------+ + %ebp -> | %ebp last frame--------> | %ebp last frame--->... + | | | | + | return address | | return address | + +-----------------+ +-----------------+ +*/ +struct layout +{ + struct layout *next; + void *return_address; +}; + +int +__backtrace (array, size) + void **array; + int size; +{ + /* We assume that all the code is generated with frame pointers set. */ + register void *ebp __asm__ ("ebp"); + struct layout *current; + int cnt = 0; + + /* We skip the call to this function, it makes no sense to record it. */ + current = (struct layout *) ebp; + while (cnt < size) + { + if (current == NULL) + /* This means the toplevel is reached. */ + break; + + array[cnt++] = current->return_address; + + current = current->next; + } + + return cnt; +} +weak_alias (__backtrace, backtrace) -- cgit 1.4.1