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Message-ID: <20121030015733.GA29701@altlinux.org>
Date: Tue, 30 Oct 2012 05:57:33 +0400
From: "Dmitry V. Levin" <ldv@...linux.org>
To: owl-dev@...ts.openwall.com
Subject: Re: glibc
On Mon, Oct 29, 2012 at 11:34:39PM +0400, Dmitry V. Levin wrote:
> On Mon, Oct 29, 2012 at 10:17:48PM +0400, Vasily Kulikov wrote:
> [...]
> > 'strncmp' symbol is present on x86_64, but absent on i686:
> >
> > $ readelf -s logs/glibc-build-i386/elf/rtld-libc.a | grep strncmp
> > 22: 00000000 0 NOTYPE GLOBAL DEFAULT UND strncmp
> > File: logs/glibc-build-i386/elf/rtld-libc.a(rtld-strncmp-c.os)
> > 1: 00000000 0 FILE LOCAL DEFAULT ABS strncmp-c.c
> > 15: 00000000 279 FUNC GLOBAL DEFAULT 1 __strncmp_ia32
> > 16: 00000000 279 FUNC GLOBAL DEFAULT 1 __GI_strncmp
> >
> > $ readelf -s logs/glibc-build-x86_64/elf/rtld-libc.a | grep strncmp
> > 19: 0000000000000000 0 NOTYPE GLOBAL DEFAULT UND strncmp
> > File: logs/glibc-build-x86_64/elf/rtld-libc.a(rtld-strncmp.os)
> > 10: 0000000000000000 33 FUNC GLOBAL DEFAULT 1 strncmp
> > File: logs/glibc-build-x86_64/elf/rtld-libc.a(rtld-strncmp-ssse3.os)
> > 11: 0000000000000000 33 FUNC GLOBAL DEFAULT 4 __strncmp_ssse3
>
> The difference between x86_64 and i686 is due to STT_GNU_IFUNC.
Try this:
--- a/sysdeps/i386/i686/multiarch/Makefile
+++ b/sysdeps/i386/i686/multiarch/Makefile
@@ -24,6 +24,7 @@ sysdep_routines += bzero-sse2 memset-sse2 memcpy-ssse3 mempcpy-ssse3 \
strcasecmp_l-c strcasecmp-c strcasecmp_l-ssse3 \
strncase_l-c strncase-c strncase_l-ssse3 \
strcasecmp_l-sse4 strncase_l-sse4
+sysdep-rtld-routines += strncmp-c strncmp-ssse3 strncmp-sse4
ifeq (yes,$(config-cflags-sse4))
sysdep_routines += strcspn-c strpbrk-c strspn-c strstr-c strcasestr-c
CFLAGS-varshift.c += -msse4
--
ldv
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