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authorUlrich Drepper <drepper@redhat.com>1998-06-08 19:06:31 +0000
committerUlrich Drepper <drepper@redhat.com>1998-06-08 19:06:31 +0000
commit2de7874e55b344d5270abc8832950cf09c6d7dd7 (patch)
tree6078fed9aa78dae16461616fe2bf8b05f901716d /sysdeps/i386
parent31f7410f5c413605f039e898151f01231f11efa5 (diff)
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Update.
1998-06-08 18:57 Ulrich Drepper <drepper@cygnus.com> * 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.
Diffstat (limited to 'sysdeps/i386')
-rw-r--r--sysdeps/i386/backtrace.c63
1 files changed, 63 insertions, 0 deletions
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 <drepper@cygnus.com>, 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 <execinfo.h>
+
+
+/* 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)