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233 lines
4.6 KiB
ArmAsm
233 lines
4.6 KiB
ArmAsm
/* Copyright (C) 2002-2016 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, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <pthread-errnos.h>
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#include <lowlevellock.h>
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#include <lowlevelrobustlock.h>
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#include <kernel-features.h>
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.text
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#define FUTEX_WAITERS 0x80000000
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#define FUTEX_OWNER_DIED 0x40000000
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#ifdef __ASSUME_PRIVATE_FUTEX
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# define LOAD_FUTEX_WAIT(reg) \
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xorl $(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), reg
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#else
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# if FUTEX_WAIT == 0
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# define LOAD_FUTEX_WAIT(reg) \
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xorl $FUTEX_PRIVATE_FLAG, reg ; \
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andl %gs:PRIVATE_FUTEX, reg
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# else
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# define LOAD_FUTEX_WAIT(reg) \
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xorl $FUTEX_PRIVATE_FLAG, reg ; \
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andl %gs:PRIVATE_FUTEX, reg ; \
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orl $FUTEX_WAIT, reg
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# endif
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#endif
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.globl __lll_robust_lock_wait
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.type __lll_robust_lock_wait,@function
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.hidden __lll_robust_lock_wait
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.align 16
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__lll_robust_lock_wait:
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cfi_startproc
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pushl %edx
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cfi_adjust_cfa_offset(4)
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pushl %ebx
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cfi_adjust_cfa_offset(4)
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pushl %esi
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cfi_adjust_cfa_offset(4)
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cfi_offset(%edx, -8)
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cfi_offset(%ebx, -12)
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cfi_offset(%esi, -16)
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movl %edx, %ebx
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xorl %esi, %esi /* No timeout. */
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LOAD_FUTEX_WAIT (%ecx)
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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 /* NB: %edx == 2 */
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je 1f
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LOCK
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cmpxchgl %edx, (%ebx)
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jnz 2f
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1: movl $SYS_futex, %eax
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ENTER_KERNEL
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movl (%ebx), %eax
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2: test %eax, %eax
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jne 4b
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movl %gs:TID, %edx
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orl $FUTEX_WAITERS, %edx
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LOCK
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cmpxchgl %edx, (%ebx)
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jnz 4b
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/* NB: %eax == 0 */
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3: popl %esi
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cfi_adjust_cfa_offset(-4)
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cfi_restore(%esi)
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popl %ebx
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cfi_adjust_cfa_offset(-4)
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cfi_restore(%ebx)
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popl %edx
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cfi_adjust_cfa_offset(-4)
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cfi_restore(%edx)
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ret
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cfi_endproc
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.size __lll_robust_lock_wait,.-__lll_robust_lock_wait
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.globl __lll_robust_timedlock_wait
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.type __lll_robust_timedlock_wait,@function
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.hidden __lll_robust_timedlock_wait
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.align 16
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__lll_robust_timedlock_wait:
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cfi_startproc
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/* Check for a valid timeout value. */
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cmpl $1000000000, 4(%edx)
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jae 3f
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pushl %edi
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cfi_adjust_cfa_offset(4)
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pushl %esi
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cfi_adjust_cfa_offset(4)
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pushl %ebx
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cfi_adjust_cfa_offset(4)
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pushl %ebp
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cfi_adjust_cfa_offset(4)
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cfi_offset(%edi, -8)
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cfi_offset(%esi, -12)
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cfi_offset(%ebx, -16)
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cfi_offset(%ebp, -20)
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/* Stack frame for the timespec and timeval structs. */
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subl $12, %esp
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cfi_adjust_cfa_offset(12)
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movl %ecx, %ebp
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movl %edx, %edi
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1: movl %eax, 8(%esp)
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/* Get current time. */
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movl %esp, %ebx
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xorl %ecx, %ecx
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movl $__NR_gettimeofday, %eax
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ENTER_KERNEL
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/* Compute relative timeout. */
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movl 4(%esp), %eax
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movl $1000, %edx
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mul %edx /* Milli seconds to nano seconds. */
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movl (%edi), %ecx
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movl 4(%edi), %edx
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subl (%esp), %ecx
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subl %eax, %edx
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jns 4f
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addl $1000000000, %edx
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subl $1, %ecx
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4: testl %ecx, %ecx
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js 8f /* Time is already up. */
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/* Store relative timeout. */
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movl %ecx, (%esp)
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movl %edx, 4(%esp)
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movl %ebp, %ebx
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movl 8(%esp), %edx
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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, (%ebx)
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movl $0, %ecx /* Must use mov to avoid changing cc. */
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jnz 5f
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2:
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/* Futex call. */
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movl %esp, %esi
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movl 20(%esp), %ecx
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LOAD_FUTEX_WAIT (%ecx)
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movl $SYS_futex, %eax
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ENTER_KERNEL
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movl %eax, %ecx
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movl (%ebx), %eax
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5: testl %eax, %eax
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jne 7f
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movl %gs:TID, %edx
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orl $FUTEX_WAITERS, %edx
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LOCK
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cmpxchgl %edx, (%ebx)
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jnz 7f
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6: addl $12, %esp
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cfi_adjust_cfa_offset(-12)
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popl %ebp
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cfi_adjust_cfa_offset(-4)
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cfi_restore(%ebp)
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popl %ebx
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cfi_adjust_cfa_offset(-4)
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cfi_restore(%ebx)
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popl %esi
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cfi_adjust_cfa_offset(-4)
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cfi_restore(%esi)
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popl %edi
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cfi_adjust_cfa_offset(-4)
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cfi_restore(%edi)
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ret
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3: movl $EINVAL, %eax
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ret
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cfi_adjust_cfa_offset(28)
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cfi_offset(%edi, -8)
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cfi_offset(%esi, -12)
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cfi_offset(%ebx, -16)
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cfi_offset(%ebp, -20)
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/* Check whether the time expired. */
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7: cmpl $-ETIMEDOUT, %ecx
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jne 1b
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8: movl $ETIMEDOUT, %eax
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jmp 6b
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cfi_endproc
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.size __lll_robust_timedlock_wait,.-__lll_robust_timedlock_wait
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