From 747ef469ffc9c9179ca9d76854167925b4e44346 Mon Sep 17 00:00:00 2001 From: Siddhesh Poyarekar Date: Sat, 15 Jun 2013 00:09:26 +0530 Subject: Add rtld-memset.S for x86_64 Resolves: BZ #15627 Add an assembler version of rtld-memset to avoid using SSE registers. --- sysdeps/x86_64/rtld-memset.S | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 sysdeps/x86_64/rtld-memset.S (limited to 'sysdeps/x86_64/rtld-memset.S') diff --git a/sysdeps/x86_64/rtld-memset.S b/sysdeps/x86_64/rtld-memset.S new file mode 100644 index 0000000000..18b4903109 --- /dev/null +++ b/sysdeps/x86_64/rtld-memset.S @@ -0,0 +1,37 @@ +/* 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 + . */ + +#include +#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) -- cgit 1.4.1