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.

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)