[PATCH]: Add proper backtrace functions for sparc.

[David Miller <davem at davemloft dot net>]

This allows the fortify testcases under debug/ to pass on sparc.

After all of the patches I've posted recently are applied, the only
testcase failure left for sparcv9*-linux and sparc64*-linux is nptl's
tst-cancelx21 on 64-bit.  That's probably just another missing
-fexceptions for some part of the build and I'll try to track that
down tomorrow.

Plain sparc-linux has a few other failures, but I think those are due
to some futex issues when true atomics are not available as the
testcases that fail simply hang in some futex call.

Please apply, thanks!

2008-05-09  David S. Miller  <davem@davemloft.net>

	* sysdeps/sparc/sparc32/backtrace.c: New file.
	* sysdeps/sparc/sparc64/backtrace.c: New file.
---
 sysdeps/sparc/sparc32/backtrace.c |   55 +++++++++++++++++++++++++++++++++++
 sysdeps/sparc/sparc64/backtrace.c |   58 +++++++++++++++++++++++++++++++++++++
 2 files changed, 113 insertions(+), 0 deletions(-)
 create mode 100644 sysdeps/sparc/sparc32/backtrace.c
 create mode 100644 sysdeps/sparc/sparc64/backtrace.c

diff --git a/sysdeps/sparc/sparc32/backtrace.c b/sysdeps/sparc/sparc32/backtrace.c
new file mode 100644
index 0000000..e2357eb
--- /dev/null
+++ b/sysdeps/sparc/sparc32/backtrace.c
@@ -0,0 +1,55 @@
+/* Return backtrace of current program state.
+   Copyright (C) 2008 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by David S. Miller <davem@davemloft.net>
+
+   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>
+#include <stddef.h>
+#include <bp-checks.h>
+#include <sys/trap.h>
+
+struct layout
+{
+  unsigned long locals[8];
+  unsigned long ins[6];
+  struct layout *__unbounded next;
+  void *__unbounded return_address;
+};
+
+int
+__backtrace (void **array, int size)
+{
+  struct layout *current;
+  int count;
+
+  asm volatile ("ta %0" : : "i" (ST_FLUSH_WINDOWS));
+  asm volatile ("mov %%fp, %0" : "=r"(current));
+  current = BOUNDED_1 (current);
+
+  for (count = 0; count < size; count++)
+    {
+      array[count] = current->return_address;
+      current = BOUNDED_1 (current->next);
+      if (!current)
+	break;
+    }
+
+  return count;
+}
+weak_alias (__backtrace, backtrace)
+libc_hidden_def (__backtrace)
diff --git a/sysdeps/sparc/sparc64/backtrace.c b/sysdeps/sparc/sparc64/backtrace.c
new file mode 100644
index 0000000..6d7e429
--- /dev/null
+++ b/sysdeps/sparc/sparc64/backtrace.c
@@ -0,0 +1,58 @@
+/* Return backtrace of current program state.
+   Copyright (C) 2008 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by David S. Miller <davem@davemloft.net>
+
+   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>
+#include <stddef.h>
+#include <bp-checks.h>
+#include <sysdep.h>
+
+struct layout
+{
+  unsigned long locals[8];
+  unsigned long ins[6];
+  unsigned long next;
+  void *__unbounded return_address;
+};
+
+int
+__backtrace (void **array, int size)
+{
+  struct layout *current;
+  unsigned long fp;
+  int count;
+
+  asm volatile ("flushw");
+  asm volatile ("mov %%fp, %0" : "=r"(fp));
+  current = (struct layout *__unbounded) (fp + STACK_BIAS);
+  current = BOUNDED_1 (current);
+
+  for (count = 0; count < size; count++)
+    {
+      array[count] = current->return_address;
+      if (!current->next)
+	break;
+      current = (struct layout *__unbounded) (current->next + STACK_BIAS);
+      current = BOUNDED_1 (current);
+    }
+
+  return count;
+}
+weak_alias (__backtrace, backtrace)
+libc_hidden_def (__backtrace)
-- 
1.5.5.1.57.g5909c