195 lines
3.8 KiB
ArmAsm
195 lines
3.8 KiB
ArmAsm
/* Copyright (C) 2002, 2003, 2004, 2005, 2006 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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#include <sysdep.h>
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#include <pthread-errnos.h>
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#include <lowlevelrobustlock.h>
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.text
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#ifndef LOCK
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# ifdef UP
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# define LOCK
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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 202
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define FUTEX_WAITERS 0x80000000
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#define FUTEX_OWNER_DIED 0x40000000
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/* For the calculation see asm/vsyscall.h. */
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#define VSYSCALL_ADDR_vgettimeofday 0xffffffffff600000
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.globl __lll_robust_mutex_lock_wait
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.type __lll_robust_mutex_lock_wait,@function
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.hidden __lll_robust_mutex_lock_wait
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.align 16
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__lll_robust_mutex_lock_wait:
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pushq %r10
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pushq %rdx
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xorq %r10, %r10 /* No timeout. */
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#if FUTEX_WAIT == 0
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xorl %esi, %esi
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#else
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movl $FUTEX_WAIT, %esi
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#endif
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4: movl %eax, %edx
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orl $FUTEX_WAITERS, %edx
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testl $FUTEX_OWNER_DIED, %eax
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jnz 3f
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cmpl %edx, %eax
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je 1f
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LOCK
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cmpxchgl %edx, (%rdi)
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jnz 2f
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1: movl $SYS_futex, %eax
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syscall
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movl (%rdi), %eax
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2: testl %eax, %eax
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jne 4b
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movl %fs:TID, %edx
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orl $FUTEX_WAITERS, %edx
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LOCK
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cmpxchgl %edx, (%rdi)
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jnz 4b
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/* NB: %rax == 0 */
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3: popq %rdx
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popq %r10
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retq
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.size __lll_robust_mutex_lock_wait,.-__lll_robust_mutex_lock_wait
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.globl __lll_robust_mutex_timedlock_wait
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.type __lll_robust_mutex_timedlock_wait,@function
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.hidden __lll_robust_mutex_timedlock_wait
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.align 16
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__lll_robust_mutex_timedlock_wait:
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/* Check for a valid timeout value. */
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cmpq $1000000000, 8(%rdx)
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jae 3f
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pushq %r8
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pushq %r9
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pushq %r12
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pushq %r13
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/* Stack frame for the timespec and timeval structs. */
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subq $24, %rsp
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movq %rdi, %r12
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movq %rdx, %r13
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1: movq %rax, 16(%rsp)
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/* Get current time. */
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movq %rsp, %rdi
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xorl %esi, %esi
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movq $VSYSCALL_ADDR_vgettimeofday, %rax
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/* This is a regular function call, all caller-save registers
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might be clobbered. */
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callq *%rax
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/* Compute relative timeout. */
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movq 8(%rsp), %rax
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movl $1000, %edi
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mul %rdi /* Milli seconds to nano seconds. */
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movq (%r13), %rdi
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movq 8(%r13), %rsi
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subq (%rsp), %rdi
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subq %rax, %rsi
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jns 4f
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addq $1000000000, %rsi
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decq %rdi
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4: testq %rdi, %rdi
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js 8f /* Time is already up. */
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/* Futex call. */
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movq %rdi, (%rsp) /* Store relative timeout. */
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movq %rsi, 8(%rsp)
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movq 16(%rsp), %rdx
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movl %edx, %eax
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orl $FUTEX_WAITERS, %edx
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testl $FUTEX_OWNER_DIED, %eax
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jnz 6f
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cmpl %eax, %edx
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je 2f
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LOCK
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cmpxchgl %edx, (%r12)
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movq $0, %rcx /* Must use mov to avoid changing cc. */
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jnz 5f
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2: movq %rsp, %r10
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#if FUTEX_WAIT == 0
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xorl %esi, %esi
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#else
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movl $FUTEX_WAIT, %esi
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#endif
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movq %r12, %rdi
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movl $SYS_futex, %eax
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syscall
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movq %rax, %rcx
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movl (%r12), %eax
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5: testl %eax, %eax
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jne 7f
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movl %fs:TID, %edx
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orl $FUTEX_WAITERS, %edx
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LOCK
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cmpxchgl %edx, (%r12)
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jnz 7f
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6: addq $24, %rsp
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popq %r13
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popq %r12
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popq %r9
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popq %r8
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retq
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/* Check whether the time expired. */
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7: cmpq $-ETIMEDOUT, %rcx
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jne 1b
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8: movl $ETIMEDOUT, %eax
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jmp 6b
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3: movl $EINVAL, %eax
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retq
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.size __lll_robust_mutex_timedlock_wait,.-__lll_robust_mutex_timedlock_wait
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