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* sysdeps/unix/sysv/linux/i386/pthread_once.S: Use ENTER_KERNEL instead of int $0x80. * sysdeps/unix/sysv/linux/i386/i486/libc-lowlevellock.S: Likewise. * sysdeps/unix/sysv/linux/i386/i486/libc-lowlevelmutex.S: Likewise. * sysdeps/unix/sysv/linux/i386/i486/lowlevelcond.S: Likewise. * sysdeps/unix/sysv/linux/i386/i486/lowlevellock.S: Likewise. * sysdeps/unix/sysv/linux/i386/i486/lowlevelmutex.S: Likewise. * sysdeps/unix/sysv/linux/i386/i486/lowlevelrwlock.S: Likewise. * sysdeps/unix/sysv/linux/i386/i486/lowlevelsem.S: Likewise. * sysdeps/unix/sysv/linux/i386/i486/pthread_barrier_wait.S: Likewise. * sysdeps/unix/sysv/linux/i386/lowlevellock.h: Add support for using sysenter. * sysdeps/unix/sysv/linux/i386/lowlevelsem.h: Likewise. * sysdeps/i386/tls.h: Unconditionally include <dl-sysdep.h>.
117 lines
4.0 KiB
C
117 lines
4.0 KiB
C
/* Copyright (C) 2002 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#ifndef _LOWLEVELSEM_H
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#define _LOWLEVELSEM_H 1
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#include <dl-sysdep.h>
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#include <tls.h>
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#ifndef LOCK
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# ifdef UP
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# define LOCK /* nothing */
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# else
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# define LOCK "lock;"
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# endif
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#endif
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#define SYS_futex 240
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#ifdef I386_USE_SYSENTER
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# ifdef SHARED
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# define LLL_SEM_ENTER_KERNEL(arg) "call *%%gs:%P" #arg "\n\t"
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# else
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# define LLL_SEM_ENTER_KERNEL(arg) "call *_dl_sysinfo\n\t"
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# endif
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#else
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# define LLL_SEM_ENTER_KERNEL(arg) "int $0x80\n\t"
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#endif
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#define lll_sem_wait(sem) \
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({ int result, ignore1, ignore2; \
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__asm __volatile ("1:\tincl 8(%4)\n\t" \
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LOCK "incl (%4)\n\t" \
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"jng 2f\n" \
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".subsection 1\n" \
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"2:\tmovl %4, %%eax\n\t" \
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"call __lll_unlock_wake\n\t" \
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"jmp 3f\n\t" \
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".previous\n" \
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"3:\tpushl %%ebx\n\t" \
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"movl %%esi, %%ecx\n\t" \
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"movl %%esi, %%edx\n\t" \
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"leal 4(%4), %%ebx\n\t" \
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"movl %5, %%eax\n\t" \
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LLL_SEM_ENTER_KERNEL (9) \
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"movl %%eax, %%edx\n\t" \
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"popl %%ebx\n\t" \
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"orl $-1, %%eax\n\t" \
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LOCK "xaddl %%eax, (%4)\n\t" \
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"jne 4f\n\t" \
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".subsection 1\n" \
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"4:\tmovl %4, %%ecx\n\t" \
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"call __lll_lock_wait\n\t" \
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"jmp 5f\n\t" \
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".previous\n" \
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"5:\tdecl 8(%4)\n\t" \
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"xorl %0, %0\n\t" \
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"cmpl $0, 4(%4)\n\t" \
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"jne,pt 6f\n\t" \
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"cmpl %7, %%edx\n\t" \
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"jne,pn 1b\n\t" \
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"addl %8, %0\n\t" /* Shorter than movl %7, %0 */ \
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"6:" \
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: "=a" (result), "=c" (ignore1), "=d" (ignore2), \
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"=m" (*sem) \
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: "D" (sem), "i" (SYS_futex), "S" (0), \
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"i" (-EINTR), "i" (EINTR), \
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"i" (offsetof (tcbhead_t, sysinfo))); \
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result; })
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extern int __lll_sem_timedwait (struct sem *sem, const struct timespec *ts)
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__attribute__ ((regparm (2))) attribute_hidden;
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#define lll_sem_timedwait(sem, timeout) \
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__lll_sem_timedwait (sem, timeout)
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#define lll_sem_post(sem) \
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(void) ({ int ignore1, ignore2, ignore3; \
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__asm __volatile ("movl $1, %%eax\n\t" \
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LOCK \
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"xaddl %%eax, (%4)\n\t" \
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"pushl %%esi\n\t" \
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"pushl %%ebx\n\t" \
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"movl %4, %%ebx\n\t" \
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"leal 1(%%eax), %%edx\n\t" \
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"xorl %%esi, %%esi\n\t" \
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"movl %5, %%eax\n\t" \
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/* movl $FUTEX_WAKE, %ecx */ \
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"movl $1, %%ecx\n\t" \
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LLL_SEM_ENTER_KERNEL (6) \
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"popl %%ebx\n\t" \
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"popl %%esi" \
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: "=&a" (ignore1), "=c" (ignore2), \
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"=m" (*sem), "=d" (ignore3) \
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: "r" (sem), "i" (SYS_futex), \
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"i" (offsetof (tcbhead_t, sysinfo))); })
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#endif /* lowlevelsem.h */
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