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https://sourceware.org/git/glibc.git
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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.
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Copyright (C) 2003-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <stdio.h>
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#include <stdint.h>
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int
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__attribute__ ((weak, noclone, noinline))
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is_aligned (void *p, int align)
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{
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return (((uintptr_t) p) & (align - 1)) != 0;
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}
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#ifndef TEST_STACK_ALIGN_INIT
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# define TEST_STACK_ALIGN_INIT() 0
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#endif
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#define TEST_STACK_ALIGN() \
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({ \
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double _d = 12.0; \
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long double _ld = 15.0; \
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int _ret = TEST_STACK_ALIGN_INIT (); \
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\
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printf ("double: %g %p %zu\n", _d, &_d, __alignof (double)); \
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_ret += is_aligned (&_d, __alignof (double)); \
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\
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printf ("ldouble: %Lg %p %zu\n", _ld, &_ld, \
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__alignof (long double)); \
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_ret += is_aligned (&_ld, __alignof (long double)); \
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_ret; \
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})
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