mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 13:00:06 +00:00
688903eb3e
* All files with FSF copyright notices: Update copyright dates using scripts/update-copyrights. * locale/programs/charmap-kw.h: Regenerated. * locale/programs/locfile-kw.h: Likewise.
44 lines
1.6 KiB
C
44 lines
1.6 KiB
C
/* Copyright (C) 2001-2018 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_64 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 %%" RSP_LP ", %0" : "=r" (p__)); p__; })
|
|
#define stackinfo_sub_sp(ptr) \
|
|
({ ptrdiff_t d__; \
|
|
asm volatile ("sub %%" RSP_LP " , %0" : "=r" (d__) : "0" (ptr)); \
|
|
d__; })
|
|
|
|
#endif /* stackinfo.h */
|