From 5a103908c025049106663c831471473205782985 Mon Sep 17 00:00:00 2001 From: "H.J. Lu" Date: Mon, 12 Jun 2017 09:05:57 -0700 Subject: 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. --- sysdeps/x86_64/multiarch/strncpy-c.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'sysdeps/x86_64/multiarch/strncpy-c.c') diff --git a/sysdeps/x86_64/multiarch/strncpy-c.c b/sysdeps/x86_64/multiarch/strncpy-c.c index 296c32c..57c45ac 100644 --- a/sysdeps/x86_64/multiarch/strncpy-c.c +++ b/sysdeps/x86_64/multiarch/strncpy-c.c @@ -1,8 +1,5 @@ #define STRNCPY __strncpy_sse2 -#ifdef SHARED #undef libc_hidden_builtin_def -#define libc_hidden_builtin_def(name) \ - __hidden_ver1 (__strncpy_sse2, __GI_strncpy, __strncpy_sse2); -#endif +#define libc_hidden_builtin_def(strncpy) -#include "strncpy.c" +#include -- cgit v1.1