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On top of this patch we include a few more redirecting versions of
the rtld-* routines in multiarch, this is needed because of the
sysd-rules which try to build from multiarch first and will even
use memset.S from multiarch to buidl rtld-memset.os, which results
in SSE register usage in rtld which we can't allow because of
lazy binding (though in some cases we use RTLD_PREPARE_FOREIGN_CALL
and others to wrap such calls).
commit 747ef469ffc9c9179ca9d76854167925b4e44346
Author: Siddhesh Poyarekar <siddhesh@redhat.com>
Date: Sat Jun 15 00:09:26 2013 +0530
Add rtld-memset.S for x86_64
Resolves: BZ #15627
Add an assembler version of rtld-memset to avoid using SSE registers.
Index: glibc-2.17-c758a686/sysdeps/x86_64/rtld-memset.S
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/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
+ <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)
Index: glibc-2.17-c758a686/sysdeps/x86_64/rtld-memset.c
===================================================================
--- glibc-2.17-c758a686.orig/sysdeps/x86_64/rtld-memset.c
+++ /dev/null
@@ -1 +0,0 @@
-#include <string/memset.c>
Index: glibc-2.17-c758a686/sysdeps/x86_64/multiarch/rtld-memset.S
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/sysdeps/x86_64/multiarch/rtld-memset.S
@@ -0,0 +1 @@
+#include "../rtld-memset.S"
Index: glibc-2.17-c758a686/sysdeps/x86_64/multiarch/rtld-strchr.S
===================================================================
--- /dev/null
+++ glibc-2.17-c758a686/sysdeps/x86_64/multiarch/rtld-strchr.S
@@ -0,0 +1 @@
+#include "../rtld-strchr.S"