mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-27 21:20:18 +00:00
79aec84102
1. Replace
if ((((uintptr_t) &_d) & (__alignof (double) - 1)) != 0)
which may be optimized out by compiler, with
int
__attribute__ ((weak, noclone, noinline))
is_aligned (void *p, int align)
{
return (((uintptr_t) p) & (align - 1)) != 0;
}
2. Add TEST_STACK_ALIGN_INIT to TEST_STACK_ALIGN.
3. Add a common TEST_STACK_ALIGN_INIT to check 16-byte stack alignment
for both i386 and x86-64.
4. Update powerpc to use TEST_STACK_ALIGN_INIT.
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
47 lines
1.6 KiB
C
47 lines
1.6 KiB
C
/* Check stack alignment. Generic version.
|
|
Copyright (C) 2003-2021 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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#include <stdio.h>
|
|
#include <stdint.h>
|
|
|
|
int
|
|
__attribute__ ((weak, noclone, noinline))
|
|
is_aligned (void *p, int align)
|
|
{
|
|
return (((uintptr_t) p) & (align - 1)) != 0;
|
|
}
|
|
|
|
#ifndef TEST_STACK_ALIGN_INIT
|
|
# define TEST_STACK_ALIGN_INIT() 0
|
|
#endif
|
|
|
|
#define TEST_STACK_ALIGN() \
|
|
({ \
|
|
double _d = 12.0; \
|
|
long double _ld = 15.0; \
|
|
int _ret = TEST_STACK_ALIGN_INIT (); \
|
|
\
|
|
printf ("double: %g %p %zu\n", _d, &_d, __alignof (double)); \
|
|
_ret += is_aligned (&_d, __alignof (double)); \
|
|
\
|
|
printf ("ldouble: %Lg %p %zu\n", _ld, &_ld, \
|
|
__alignof (long double)); \
|
|
_ret += is_aligned (&_ld, __alignof (long double)); \
|
|
_ret; \
|
|
})
|