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Ulrich Drepper 2003-03-10 21:31:55 +00:00
parent 19afbd2cfd
commit 873010c8a4
1 changed files with 0 additions and 116 deletions
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nptl/sysdeps/unix/sysv/linux/i386/lowlevelsem.h
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/* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#ifndef _LOWLEVELSEM_H
#define _LOWLEVELSEM_H 1
#include <dl-sysdep.h>
#include <tls.h>
#ifndef LOCK
# ifdef UP
# define LOCK /* nothing */
# else
# define LOCK "lock;"
# endif
#endif
#define SYS_futex 240
#ifdef I386_USE_SYSENTER
# ifdef SHARED
# define LLL_SEM_ENTER_KERNEL(arg) "call *%%gs:%P" #arg "\n\t"
# else
# define LLL_SEM_ENTER_KERNEL(arg) "call *_dl_sysinfo\n\t"
# endif
#else
# define LLL_SEM_ENTER_KERNEL(arg) "int $0x80\n\t"
#endif
#define lll_sem_wait(sem) \
({ int result, ignore1, ignore2; \
__asm __volatile ("1:\taddl $1,8(%4)\n\t" \
LOCK "addl $1,(%4)\n\t" \
"jng 2f\n" \
".subsection 1\n" \
"2:\tmovl %4, %%eax\n\t" \
"call __lll_unlock_wake\n\t" \
"jmp 3f\n\t" \
".previous\n" \
"3:\tpushl %%ebx\n\t" \
"movl %%esi, %%ecx\n\t" \
"movl %%esi, %%edx\n\t" \
"leal 4(%4), %%ebx\n\t" \
"movl %5, %%eax\n\t" \
LLL_SEM_ENTER_KERNEL (9) \
"movl %%eax, %%edx\n\t" \
"popl %%ebx\n\t" \
"orl $-1, %%eax\n\t" \
LOCK "xaddl %%eax, (%4)\n\t" \
"jne 4f\n\t" \
".subsection 1\n" \
"4:\tmovl %4, %%ecx\n\t" \
"call __lll_lock_wait\n\t" \
"jmp 5f\n\t" \
".previous\n" \
"5:\tsubl $1,8(%4)\n\t" \
"xorl %0, %0\n\t" \
"cmpl $0, 4(%4)\n\t" \
"jne,pt 6f\n\t" \
"cmpl %7, %%edx\n\t" \
"jne,pn 1b\n\t" \
"addl %8, %0\n\t" /* Shorter than movl %7, %0 */ \
"6:" \
: "=a" (result), "=c" (ignore1), "=d" (ignore2), \
"=m" (*sem) \
: "D" (sem), "i" (SYS_futex), "S" (0), \
"i" (-EINTR), "i" (EINTR), \
"i" (offsetof (tcbhead_t, sysinfo))); \
result; })
extern int __lll_sem_timedwait (struct sem *sem, const struct timespec *ts)
__attribute__ ((regparm (2))) attribute_hidden;
#define lll_sem_timedwait(sem, timeout) \
__lll_sem_timedwait (sem, timeout)
#define lll_sem_post(sem) \
(void) ({ int ignore1, ignore2, ignore3; \
__asm __volatile ("movl $1, %%eax\n\t" \
LOCK \
"xaddl %%eax, (%4)\n\t" \
"pushl %%esi\n\t" \
"pushl %%ebx\n\t" \
"movl %4, %%ebx\n\t" \
"leal 1(%%eax), %%edx\n\t" \
"xorl %%esi, %%esi\n\t" \
"movl %5, %%eax\n\t" \
/* movl $FUTEX_WAKE, %ecx */ \
"movl $1, %%ecx\n\t" \
LLL_SEM_ENTER_KERNEL (6) \
"popl %%ebx\n\t" \
"popl %%esi" \
: "=&a" (ignore1), "=c" (ignore2), \
"=m" (*sem), "=d" (ignore3) \
: "r" (sem), "i" (SYS_futex), \
"i" (offsetof (tcbhead_t, sysinfo))); })
#endif /* lowlevelsem.h */