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On top of this patch we include a few more redirecting versions of
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the rtld-* routines in multiarch, this is needed because of the
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sysd-rules which try to build from multiarch first and will even
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use memset.S from multiarch to buidl rtld-memset.os, which results
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in SSE register usage in rtld which we can't allow because of
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lazy binding (though in some cases we use RTLD_PREPARE_FOREIGN_CALL
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and others to wrap such calls).
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commit 747ef469ffc9c9179ca9d76854167925b4e44346
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Author: Siddhesh Poyarekar <siddhesh@redhat.com>
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Date: Sat Jun 15 00:09:26 2013 +0530
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Add rtld-memset.S for x86_64
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Resolves: BZ #15627
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Add an assembler version of rtld-memset to avoid using SSE registers.
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Index: glibc-2.17-c758a686/sysdeps/x86_64/rtld-memset.S
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===================================================================
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--- /dev/null
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+++ glibc-2.17-c758a686/sysdeps/x86_64/rtld-memset.S
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@@ -0,0 +1,37 @@
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+/* memset implementation for the dynamic linker. This is separate from the
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+ libc implementation to avoid writing to SSE registers.
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+ Copyright (C) 2013 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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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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+
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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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+
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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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+ <http://www.gnu.org/licenses/>. */
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+
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+#include <sysdep.h>
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+#include "asm-syntax.h"
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+
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+
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+ .text
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+/* void *memset (void *dest, char c, size_t count)
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+ dest => %rdi
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+ c => %rsi
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+ count => %rdx */
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+ENTRY (memset)
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+ mov %rdx, %rcx
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+ movzbl %sil, %eax
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+ mov %rdi, %rdx
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+ rep stosb
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+ mov %rdx, %rax
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+ ret
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+END (memset)
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+libc_hidden_builtin_def (memset)
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Index: glibc-2.17-c758a686/sysdeps/x86_64/rtld-memset.c
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===================================================================
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--- glibc-2.17-c758a686.orig/sysdeps/x86_64/rtld-memset.c
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+++ /dev/null
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@@ -1 +0,0 @@
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-#include <string/memset.c>
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Index: glibc-2.17-c758a686/sysdeps/x86_64/multiarch/rtld-memset.S
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===================================================================
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--- /dev/null
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+++ glibc-2.17-c758a686/sysdeps/x86_64/multiarch/rtld-memset.S
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@@ -0,0 +1 @@
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+#include "../rtld-memset.S"
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Index: glibc-2.17-c758a686/sysdeps/x86_64/multiarch/rtld-strchr.S
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===================================================================
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--- /dev/null
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+++ glibc-2.17-c758a686/sysdeps/x86_64/multiarch/rtld-strchr.S
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@@ -0,0 +1 @@
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+#include "../rtld-strchr.S"
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