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Don't call gettimeofday vsyscall in x86-64 sem_timedwait

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This commit is contained in:
Ulrich Drepper 2011-09-06 23:17:53 -04:00
parent ceaa0c5dc3
commit a0e1f41bd4
2 changed files with 10 additions and 8 deletions
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5
nptl/ChangeLog
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@ -1,3 +1,8 @@
2011-09-06 Ulrich Drepper <drepper@gmail.com>
* sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S (sem_timedwait): Don't
use gettimeofday vsyscall, just call gettimeofday.
2011-09-05 David S. Miller <davem@davemloft.net>
* sysdeps/unix/sysv/linux/sem_timedwait.c (do_futex_timed_wait):

13
nptl/sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S
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@ -1,4 +1,4 @@
/* Copyright (C) 2002,2003,2005,2007,2009,2010 Free Software Foundation, Inc.
/* Copyright (C) 2002,2003,2005,2007,2009,2010,2011 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
@ -24,10 +24,6 @@
#include <pthread-errnos.h>
#include <structsem.h>
/* For the calculation see asm/vsyscall.h. */
#define VSYSCALL_ADDR_vgettimeofday 0xffffffffff600000
.text
.globl sem_timedwait
@ -212,9 +208,10 @@ sem_timedwait:
addq $1, NWAITERS(%r12)
7: xorl %esi, %esi
movq %rsp, %rdi
movq $VSYSCALL_ADDR_vgettimeofday, %rax
callq *%rax
movq %rsp,%rdi
/* This call works because we directly jump to a system call entry
which preserves all the registers. */
call JUMPTARGET(__gettimeofday)
/* Compute relative timeout. */
movq 8(%rsp), %rax