1 files changed, 43 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/stackinfo.h b/REORG.TODO/sysdeps/i386/stackinfo.h
new file mode 100644
index 0000000000..ba17867d3a
--- /dev/null
+++ b/REORG.TODO/sysdeps/i386/stackinfo.h
@@ -0,0 +1,43 @@
+/* Copyright (C) 1999-2017 Free Software Foundation, Inc.
+   This file is part of the GNU C Library.
+
+   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 x86 the stack grows down.  */
+#define _STACK_GROWS_DOWN	1
+
+/* Default to an executable stack.  PF_X can be overridden if PT_GNU_STACK is
+ * present, but it is presumed absent.  */
+#define DEFAULT_STACK_PERMS (PF_R|PF_W|PF_X)
+
+/* 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 ("mov %%esp, %0" : "=r" (p__)); p__; })
+#define stackinfo_sub_sp(ptr) \
+  ({ ptrdiff_t d__;                                             \
+     asm volatile ("sub %%esp, %0" : "=r" (d__) : "0" (ptr));   \
+     d__; })
+
+#endif	/* stackinfo.h */