From 647925b260ed00034b0ca8c7598c92f6d28a3e99 Mon Sep 17 00:00:00 2001 From: Ulrich Drepper Date: Thu, 29 Jan 2009 15:36:26 +0000 Subject: * sysdeps/i386/stackinfo.h (stackinfo_get_sp): Define. (stackinfo_sub_sp): Define. --- sysdeps/i386/stackinfo.h | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) (limited to 'sysdeps/i386/stackinfo.h') diff --git a/sysdeps/i386/stackinfo.h b/sysdeps/i386/stackinfo.h index a9a6745aaf..2530ea7234 100644 --- a/sysdeps/i386/stackinfo.h +++ b/sysdeps/i386/stackinfo.h @@ -1,4 +1,4 @@ -/* Copyright (C) 1999 Free Software Foundation, Inc. +/* Copyright (C) 1999, 2009 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 @@ -25,4 +25,14 @@ /* On x86 the stack grows down. */ #define _STACK_GROWS_DOWN 1 +/* 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 */ -- cgit v1.2.3