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| author | Ulrich Drepper <drepper@gmail.com> | 2011-05-27 16:09:52 -0400 |
|---|---|---|
| committer | Ulrich Drepper <drepper@gmail.com> | 2011-05-27 16:09:52 -0400 |
| commit | a8509ca540427502bd955f35296ff7b727c7a8a1 (patch) | |
| tree | 964578fc90ec1cdd1b6af5b04dc0a4dd12fa266e /sysdeps/unix | |
| parent | fdc2fefe46db79f0a19f690531cd775fbbc2740f (diff) | |
| download | glibc-a8509ca540427502bd955f35296ff7b727c7a8a1.zip glibc-a8509ca540427502bd955f35296ff7b727c7a8a1.tar.gz glibc-a8509ca540427502bd955f35296ff7b727c7a8a1.tar.bz2 | |
Use getcpu definition from vDSO on x86-64
Diffstat (limited to 'sysdeps/unix')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/init-first.c | 12 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S | 7 |
2 files changed, 17 insertions, 2 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/init-first.c b/sysdeps/unix/sysv/linux/x86_64/init-first.c index ead7dbc..23934fc 100644 --- a/sysdeps/unix/sysv/linux/x86_64/init-first.c +++ b/sysdeps/unix/sysv/linux/x86_64/init-first.c @@ -1,4 +1,4 @@ -/* Copyright (C) 2007 Free Software Foundation, Inc. +/* Copyright (C) 2007, 2011 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 @@ -26,6 +26,8 @@ long int (*__vdso_clock_gettime) (clockid_t, struct timespec *) __attribute__ ((nocommon)); strong_alias (__vdso_clock_gettime, __GI___vdso_clock_gettime attribute_hidden) +long int (*__vdso_getcpu) (unsigned *, unsigned *, void *); + static inline void _libc_vdso_platform_setup (void) @@ -43,6 +45,14 @@ _libc_vdso_platform_setup (void) p = _dl_vdso_vsym ("clock_gettime", &linux26); PTR_MANGLE (p); __GI___vdso_clock_gettime = p; + + p = _dl_vdso_vsym ("getcpu", &linux26); + /* If the vDSO is not available we fall back on the old vsyscall. */ +#define VSYSCALL_ADDR_vgetcpu 0xffffffffff600800 + if (p == NULL) + p = (void *) VSYSCALL_ADDR_vgetcpu; + PTR_MANGLE (p); + __vdso_getcpu = p; } # define VDSO_SETUP _libc_vdso_platform_setup diff --git a/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S b/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S index a950990..8ec7d3f 100644 --- a/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S +++ b/sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S @@ -1,4 +1,4 @@ -/* Copyright (C) 2007 Free Software Foundation, Inc. +/* Copyright (C) 2007, 2011 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 @@ -35,7 +35,12 @@ ENTRY (sched_getcpu) movl $VGETCPU_CACHE_OFFSET, %edx addq %fs:0, %rdx +#ifdef SHARED + movq __vdso_getcpu(%rip), %rax + PTR_DEMANGLE (%rax) +#else movq $VSYSCALL_ADDR_vgetcpu, %rax +#endif callq *%rax cmpq $-4095, %rax |