about summary refs log tree commit diff
path: root/ports/sysdeps/tile/stackinfo.h
diff options
context:
space:
mode:
authorJoseph Myers <joseph@codesourcery.com>2012-07-01 13:06:41 +0000
committerJoseph Myers <joseph@codesourcery.com>2012-07-01 13:06:41 +0000
commite64ac02c24b43659048622714afdc92fedf561fa (patch)
tree37162878b72d302de351788bec4c9360c9d55f1d /ports/sysdeps/tile/stackinfo.h
parenta20c2b3c87aebc7d4b090c622d36480263b80042 (diff)
downloadglibc-e64ac02c24b43659048622714afdc92fedf561fa.tar.gz
glibc-e64ac02c24b43659048622714afdc92fedf561fa.tar.xz
glibc-e64ac02c24b43659048622714afdc92fedf561fa.zip
Move all files into ports/ subdirectory in preparation for merge with glibc glibc-2.16-ports-before-merge
Diffstat (limited to 'ports/sysdeps/tile/stackinfo.h')
-rw-r--r--ports/sysdeps/tile/stackinfo.h48
1 files changed, 48 insertions, 0 deletions
diff --git a/ports/sysdeps/tile/stackinfo.h b/ports/sysdeps/tile/stackinfo.h
new file mode 100644
index 0000000000..f2524ee445
--- /dev/null
+++ b/ports/sysdeps/tile/stackinfo.h
@@ -0,0 +1,48 @@
+/* Copyright (C) 2011 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+   Contributed by Chris Metcalf <cmetcalf@tilera.com>, 2011.
+
+   The GNU C Library is free software; you can redistribute it and/or
+   modify it under the terms of the GNU Lesser General Public
+   License as published by the Free Software Foundation; either
+   version 2.1 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
+   Lesser General Public License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with the GNU C Library.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This file contains a bit of information about the stack allocation
+   of the processor.  */
+
+#ifndef _STACKINFO_H
+#define _STACKINFO_H	1
+
+#include <elf.h>
+
+/* On tile the stack grows down.  */
+#define _STACK_GROWS_DOWN	1
+
+/* Default to a non-executable stack. */
+#define DEFAULT_STACK_PERMS (PF_R|PF_W)
+
+/* Access to the stack pointer.  The macros are used in alloca_account
+   for which they need to act as barriers as well, hence the additional
+   (unnecessary) parameters.  */
+#define stackinfo_get_sp() \
+  ({ void *p__; asm volatile ("move %0, sp" : "=r" (p__)); p__; })
+#if defined __tilegx__ && __WORDSIZE == 32
+#define __stackinfo_sub "subx"
+#else
+#define __stackinfo_sub "sub"
+#endif
+#define stackinfo_sub_sp(ptr)                                  \
+  ({ ptrdiff_t d__;                                             \
+    asm volatile (__stackinfo_sub " %0, %0, sp" : "=r" (d__) : "0" (ptr));  \
+    d__; })
+
+#endif /* stackinfo.h */