x86-64: Implement strcpy family IFUNC selectors in C

Implement strcpy family IFUNC selectors in C.

All internal calls within libc.so can use IFUNC on x86-64 since unlike
x86, x86-64 supports PC-relative addressing to access the GOT entry so
that it can call via PLT without using an extra register.  For libc.a,
we can't use IFUNC for functions which are called before IFUNC has been
initialized.  Use IFUNC internally reduces the icache footprint since
libc.so and other codes in the process use the same implementations.
This patch uses IFUNC for strcpy family functions within libc.

	* sysdeps/x86_64/multiarch/Makefile (sysdep_routines): Add
	strcpy-sse2 and stpcpy-sse2.
	* sysdeps/x86_64/multiarch/ifunc-unaligned-ssse3.h: New file.
	* sysdeps/x86_64/multiarch/stpcpy-sse2.S: Likewise.
	* sysdeps/x86_64/multiarch/stpcpy.c: Likewise.
	* sysdeps/x86_64/multiarch/stpncpy.c: Likewise.
	* sysdeps/x86_64/multiarch/strcpy-sse2.S: Likewise.
	* sysdeps/x86_64/multiarch/strcpy.c: Likewise.
	* sysdeps/x86_64/multiarch/strncpy.c: Likewise.
	* sysdeps/x86_64/multiarch/stpcpy.S: Removed.
	* sysdeps/x86_64/multiarch/stpncpy.S: Likewise.
	* sysdeps/x86_64/multiarch/strcpy.S: Likewise.
	* sysdeps/x86_64/multiarch/strncpy.S: Likewise.
	* sysdeps/x86_64/multiarch/stpncpy-c.c (weak_alias): New.
	(libc_hidden_def): Always defined as empty.
	* sysdeps/x86_64/multiarch/strncpy-c.c (libc_hidden_builtin_def):
	Always Defined as empty.

1 files changed, 0 insertions, 99 deletions

diff --git a/sysdeps/x86_64/multiarch/strcpy.S b/sysdeps/x86_64/multiarch/strcpy.S
deleted file mode 100644
index 77819ddc50..0000000000
--- a/sysdeps/x86_64/multiarch/strcpy.S
+++ /dev/null
@@ -1,99 +0,0 @@
-/* Multiple versions of strcpy
-   All versions must be listed in ifunc-impl-list.c.
-   Copyright (C) 2009-2017 Free Software Foundation, Inc.
-   Contributed by Intel Corporation.
-   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 <init-arch.h>
-
-#if !defined (USE_AS_STPCPY) && !defined (USE_AS_STRNCPY)
-# ifndef STRCPY
-#  define STRCPY strcpy
-# endif
-#endif
-
-#ifdef USE_AS_STPCPY
-# ifdef USE_AS_STRNCPY
-#  define STRCPY_SSSE3		__stpncpy_ssse3
-#  define STRCPY_SSE2		__stpncpy_sse2
-#  define STRCPY_SSE2_UNALIGNED __stpncpy_sse2_unaligned
-#  define __GI_STRCPY		__GI_stpncpy
-#  define __GI___STRCPY		__GI___stpncpy
-# else
-#  define STRCPY_SSSE3		__stpcpy_ssse3
-#  define STRCPY_SSE2		__stpcpy_sse2
-#  define STRCPY_SSE2_UNALIGNED	__stpcpy_sse2_unaligned
-#  define __GI_STRCPY		__GI_stpcpy
-#  define __GI___STRCPY		__GI___stpcpy
-# endif
-#else
-# ifdef USE_AS_STRNCPY
-#  define STRCPY_SSSE3		__strncpy_ssse3
-#  define STRCPY_SSE2		__strncpy_sse2
-#  define STRCPY_SSE2_UNALIGNED	__strncpy_sse2_unaligned
-#  define __GI_STRCPY		__GI_strncpy
-# else
-#  define STRCPY_SSSE3		__strcpy_ssse3
-#  define STRCPY_SSE2		__strcpy_sse2
-#  define STRCPY_SSE2_UNALIGNED	__strcpy_sse2_unaligned
-#  define __GI_STRCPY		__GI_strcpy
-# endif
-#endif
-
-
-/* Define multiple versions only for the definition in libc.  */
-#if IS_IN (libc)
-	.text
-ENTRY(STRCPY)
-	.type	STRCPY, @gnu_indirect_function
-	LOAD_RTLD_GLOBAL_RO_RDX
-	leaq	STRCPY_SSE2_UNALIGNED(%rip), %rax
-	HAS_ARCH_FEATURE (Fast_Unaligned_Load)
-	jnz	2f
-	leaq	STRCPY_SSE2(%rip), %rax
-	HAS_CPU_FEATURE (SSSE3)
-	jz	2f
-	leaq	STRCPY_SSSE3(%rip), %rax
-2:	ret
-END(STRCPY)
-
-# undef ENTRY
-# define ENTRY(name) \
-	.type STRCPY_SSE2, @function; \
-	.align 16; \
-	.globl STRCPY_SSE2; \
-	.hidden STRCPY_SSE2; \
-	STRCPY_SSE2: cfi_startproc; \
-	CALL_MCOUNT
-# undef END
-# define END(name) \
-	cfi_endproc; .size STRCPY_SSE2, .-STRCPY_SSE2
-# undef libc_hidden_builtin_def
-/* It doesn't make sense to send libc-internal strcpy calls through a PLT.
-   The speedup we get from using SSSE3 instruction is likely eaten away
-   by the indirect call in the PLT.  */
-# define libc_hidden_builtin_def(name) \
-	.globl __GI_STRCPY; __GI_STRCPY = STRCPY_SSE2
-# undef libc_hidden_def
-# define libc_hidden_def(name) \
-	.globl __GI___STRCPY; __GI___STRCPY = STRCPY_SSE2
-#endif
-
-#ifndef USE_AS_STRNCPY
-#include "../strcpy.S"
-#endif