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/* Copyright (C) 2002-2019 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, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <pthread-errnos.h>
#include <kernel-features.h>
#include <lowlevellock.h>
#include <stap-probe.h>
.text
#define LOAD_PRIVATE_FUTEX_WAIT(reg) \
movl $(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), reg
#define LOAD_PRIVATE_FUTEX_WAKE(reg) \
movl $(FUTEX_WAKE | FUTEX_PRIVATE_FLAG), reg
#define LOAD_FUTEX_WAIT(reg) \
xorl $(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), reg
#define LOAD_FUTEX_WAIT_ABS(reg) \
xorl $(FUTEX_WAIT_BITSET | FUTEX_PRIVATE_FLAG | FUTEX_CLOCK_REALTIME), reg
#define LOAD_FUTEX_WAKE(reg) \
xorl $(FUTEX_WAKE | FUTEX_PRIVATE_FLAG), reg
.globl __lll_lock_wait_private
.type __lll_lock_wait_private,@function
.hidden __lll_lock_wait_private
.align 16
__lll_lock_wait_private:
cfi_startproc
pushq %r10
cfi_adjust_cfa_offset(8)
pushq %rdx
cfi_adjust_cfa_offset(8)
cfi_offset(%r10, -16)
cfi_offset(%rdx, -24)
xorq %r10, %r10 /* No timeout. */
movl $2, %edx
LOAD_PRIVATE_FUTEX_WAIT (%esi)
cmpl %edx, %eax /* NB: %edx == 2 */
jne 2f
1: LIBC_PROBE (lll_lock_wait_private, 1, %rdi)
movl $SYS_futex, %eax
syscall
2: movl %edx, %eax
xchgl %eax, (%rdi) /* NB: lock is implied */
testl %eax, %eax
jnz 1b
popq %rdx
cfi_adjust_cfa_offset(-8)
cfi_restore(%rdx)
popq %r10
cfi_adjust_cfa_offset(-8)
cfi_restore(%r10)
retq
cfi_endproc
.size __lll_lock_wait_private,.-__lll_lock_wait_private
#if !IS_IN (libc)
.globl __lll_lock_wait
.type __lll_lock_wait,@function
.hidden __lll_lock_wait
.align 16
__lll_lock_wait:
cfi_startproc
pushq %r10
cfi_adjust_cfa_offset(8)
pushq %rdx
cfi_adjust_cfa_offset(8)
cfi_offset(%r10, -16)
cfi_offset(%rdx, -24)
xorq %r10, %r10 /* No timeout. */
movl $2, %edx
LOAD_FUTEX_WAIT (%esi)
cmpl %edx, %eax /* NB: %edx == 2 */
jne 2f
1: LIBC_PROBE (lll_lock_wait, 2, %rdi, %rsi)
movl $SYS_futex, %eax
syscall
2: movl %edx, %eax
xchgl %eax, (%rdi) /* NB: lock is implied */
testl %eax, %eax
jnz 1b
popq %rdx
cfi_adjust_cfa_offset(-8)
cfi_restore(%rdx)
popq %r10
cfi_adjust_cfa_offset(-8)
cfi_restore(%r10)
retq
cfi_endproc
.size __lll_lock_wait,.-__lll_lock_wait
/* %rdi: futex
%rsi: flags
%rdx: timeout
%eax: futex value
*/
.globl __lll_timedlock_wait
.type __lll_timedlock_wait,@function
.hidden __lll_timedlock_wait
.align 16
__lll_timedlock_wait:
cfi_startproc
cmpq $0, (%rdx)
js 5f
pushq %r9
cfi_adjust_cfa_offset(8)
cfi_rel_offset(%r9, 0)
movq %rdx, %r10
movl $0xffffffff, %r9d
LOAD_FUTEX_WAIT_ABS (%esi)
movl $2, %edx
cmpl %edx, %eax
jne 2f
1: movl $SYS_futex, %eax
movl $2, %edx
syscall
2: xchgl %edx, (%rdi) /* NB: lock is implied */
testl %edx, %edx
jz 3f
cmpl $-ETIMEDOUT, %eax
je 4f
cmpl $-EINVAL, %eax
jne 1b
4: movl %eax, %edx
negl %edx
3: movl %edx, %eax
popq %r9
cfi_adjust_cfa_offset(-8)
cfi_restore(%r9)
retq
5: movl $ETIMEDOUT, %eax
retq
cfi_endproc
.size __lll_timedlock_wait,.-__lll_timedlock_wait
#endif
.globl __lll_unlock_wake_private
.type __lll_unlock_wake_private,@function
.hidden __lll_unlock_wake_private
.align 16
__lll_unlock_wake_private:
cfi_startproc
pushq %rsi
cfi_adjust_cfa_offset(8)
pushq %rdx
cfi_adjust_cfa_offset(8)
cfi_offset(%rsi, -16)
cfi_offset(%rdx, -24)
movl $0, (%rdi)
LOAD_PRIVATE_FUTEX_WAKE (%esi)
movl $1, %edx /* Wake one thread. */
movl $SYS_futex, %eax
syscall
popq %rdx
cfi_adjust_cfa_offset(-8)
cfi_restore(%rdx)
popq %rsi
cfi_adjust_cfa_offset(-8)
cfi_restore(%rsi)
retq
cfi_endproc
.size __lll_unlock_wake_private,.-__lll_unlock_wake_private
#if !IS_IN (libc)
.globl __lll_unlock_wake
.type __lll_unlock_wake,@function
.hidden __lll_unlock_wake
.align 16
__lll_unlock_wake:
cfi_startproc
pushq %rsi
cfi_adjust_cfa_offset(8)
pushq %rdx
cfi_adjust_cfa_offset(8)
cfi_offset(%rsi, -16)
cfi_offset(%rdx, -24)
movl $0, (%rdi)
LOAD_FUTEX_WAKE (%esi)
movl $1, %edx /* Wake one thread. */
movl $SYS_futex, %eax
syscall
popq %rdx
cfi_adjust_cfa_offset(-8)
cfi_restore(%rdx)
popq %rsi
cfi_adjust_cfa_offset(-8)
cfi_restore(%rsi)
retq
cfi_endproc
.size __lll_unlock_wake,.-__lll_unlock_wake
#endif
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