diff options
| 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 | |
| parent | fdc2fefe46db79f0a19f690531cd775fbbc2740f (diff) | |
Use getcpu definition from vDSO on x86-64
| -rw-r--r-- | ChangeLog | 7 | ||||
| -rw-r--r-- | NEWS | 2 | ||||
| -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 |
4 files changed, 25 insertions, 3 deletions
@@ -1,5 +1,12 @@ 2011-05-27 Ulrich Drepper <drepper@gmail.com> + [BZ #12813] + * sysdeps/unix/sysv/linux/x86_64/init-first.c (__vdso_getcpu): + Retrieve getcpu symbol from vDSO. Substitute with vsyscall if not + available. + * sysdeps/unix/sysv/linux/x86_64/sched_getcpu.S [SHARED]: Use + __vdso_getcpu. + [BZ #12814] * iconvdata/Makefile (tests): Add bug-iconv9. * iconvdata/bug-iconv9.c: New file. @@ -17,7 +17,7 @@ Version 2.14 12545, 12551, 12582, 12583, 12587, 12597, 12601, 12611, 12625, 12626, 12631, 12650, 12653, 12655, 12660, 12671, 12681, 12685, 12711, 12713, 12714, 12717, 12723, 12724, 12734, 12738, 12746, 12766, 12775, 12777, - 12782, 12788, 12792, 12795, 12814 + 12782, 12788, 12792, 12795, 12813, 12814 * The RPC implementation in libc is obsoleted. Old programs keep working but new programs cannot be linked with the routines in libc anymore. diff --git a/sysdeps/unix/sysv/linux/x86_64/init-first.c b/sysdeps/unix/sysv/linux/x86_64/init-first.c index ead7dbcc38..23934fc857 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 a950990627..8ec7d3fcd2 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 |