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Add rtld-memset.S for x86_64

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Resolves: BZ #15627

Add an assembler version of rtld-memset to avoid using SSE registers.
This commit is contained in:
Siddhesh Poyarekar 2013-06-15 00:09:26 +05:30
parent 1b2feed264
commit 747ef469ff
4 changed files with 45 additions and 2 deletions
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7
ChangeLog
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@ -1,3 +1,10 @@
2013-06-14 Siddhesh Poyarekar <siddhesh@redhat.com>
H.J. Lu <hjl.tools@gmail.com>
[BZ #15627]
* sysdeps/x86_64/rtld-memset.c: Remove file.
* sysdeps/x86_64/rtld-memset.S: New file.
2013-06-14 Joseph Myers <joseph@codesourcery.com>
* stdlib/tst-strtod-round.c: Include <math-tests.h>.

2
NEWS
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@ -20,7 +20,7 @@ Version 2.18
15380, 15381, 15394, 15395, 15405, 15406, 15409, 15416, 15418, 15419,
15423, 15424, 15426, 15429, 15431, 15432, 15441, 15442, 15448, 15465,
15480, 15485, 15488, 15490, 15493, 15497, 15506, 15529, 15536, 15553,
15577, 15583, 15618.
15577, 15583, 15618, 15627.
* CVE-2013-0242 Buffer overrun in regexp matcher has been fixed (Bugzilla
#15078).

37
sysdeps/x86_64/rtld-memset.S Normal file
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/* memset implementation for the dynamic linker. This is separate from the
libc implementation to avoid writing to SSE registers.
Copyright (C) 2013 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/>. */
#include <sysdep.h>
#include "asm-syntax.h"
.text
/* void *memset (void *dest, char c, size_t count)
dest => %rdi
c => %rsi
count => %rdx */
ENTRY (memset)
mov %rdx, %rcx
movzbl %sil, %eax
mov %rdi, %rdx
rep stosb
mov %rdx, %rax
ret
END (memset)
libc_hidden_builtin_def (memset)

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sysdeps/x86_64/rtld-memset.c
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#include <string/memset.c>