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* sysdeps/i386/stackinfo.h (stackinfo_get_sp): Define.

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(stackinfo_sub_sp): Define.
This commit is contained in:
Ulrich Drepper 2009-01-29 15:36:26 +00:00
parent fd537e535f
commit 647925b260
3 changed files with 18 additions and 3 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2009-01-29 Ulrich Drepper <drepper@redhat.com>
* sysdeps/i386/stackinfo.h (stackinfo_get_sp): Define.
(stackinfo_sub_sp): Define.
2009-01-28 Ulrich Drepper <drepper@redhat.com>
[BZ #9750]

4
include/alloca.h
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@ -55,8 +55,8 @@ extern int __libc_alloca_cutoff (size_t size) __attribute__ ((const));
#else
# define alloca_account(size, avar) \
({ size_t s__ = (size); \
avar += size__; \
__alloca (size__); })
avar += s__; \
__alloca (s__); })
#endif
#endif

12
sysdeps/i386/stackinfo.h
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@ -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 */