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glibc/nptl/sysdeps/unix/sysv/linux/sh/lowlevelmutex.S
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/* Copyright (C) 2003 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
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. */ | |
#include <sysdep.h> | |
#include <pthread-errnos.h> | |
#include "lowlevel-atomic.h" | |
.text | |
#define SYS_gettimeofday __NR_gettimeofday | |
#define SYS_futex 240 | |
#define FUTEX_WAIT 0 | |
#define FUTEX_WAKE 1 | |
.globl __lll_mutex_lock_wait | |
.type __lll_mutex_lock_wait,@function | |
.hidden __lll_mutex_lock_wait | |
.align 5 | |
__lll_mutex_lock_wait: | |
mov r4, r6 | |
mov r5, r4 | |
mov #0, r7 /* No timeout. */ | |
mov #FUTEX_WAIT, r5 | |
1: | |
add #1, r6 /* account for the preceeded xadd. */ | |
mov #SYS_futex, r3 | |
extu.b r3, r3 | |
trapa #0x14 | |
SYSCALL_INST_PAD | |
mov #1, r3 | |
XADD (r3, @r4, r6) | |
tst r6, r6 | |
bf 1b | |
mov #2, r1 | |
mov.l r1, @r4 | |
ret | |
mov #0, r0 | |
.size __lll_mutex_lock_wait,.-__lll_mutex_lock_wait | |
#ifdef NOT_IN_libc | |
.globl __lll_mutex_timedlock_wait | |
.type __lll_mutex_timedlock_wait,@function | |
.hidden __lll_mutex_timedlock_wait | |
.align 5 | |
__lll_mutex_timedlock_wait: | |
/* Check for a valid timeout value. */ | |
mov.l @(4,r6), r1 | |
mov.l .L1g, r0 | |
cmp/hs r0, r1 | |
bt 3f | |
mov.l r10, @-r15 | |
mov.l r9, @-r15 | |
mov.l r8, @-r15 | |
mov r5, r8 | |
mov r6, r9 | |
mov r4, r10 | |
/* Stack frame for the timespec and timeval structs. */ | |
add #-8, r15 | |
1: | |
add #1, r10 | |
/* Get current time. */ | |
mov r15, r4 | |
mov #0, r5 | |
mov #SYS_gettimeofday, r3 | |
trapa #0x12 | |
SYSCALL_INST_PAD | |
/* Compute relative timeout. */ | |
mov.l @(4,r15), r0 | |
mov.w .L1k, r1 | |
dmulu.l r0, r1 /* Micro seconds to nano seconds. */ | |
mov.l @r9, r2 | |
mov.l @(4,r9), r3 | |
mov.l @r15, r0 | |
sts macl, r1 | |
sub r0, r2 | |
clrt | |
subc r1, r3 | |
bf 4f | |
mov.l .L1g, r1 | |
add r1, r3 | |
add #-1, r2 | |
4: | |
cmp/pz r2 | |
bf 5f /* Time is already up. */ | |
mov.l r2, @r15 /* Store relative timeout. */ | |
mov.l r3, @(4,r15) | |
mov r8, r4 | |
mov #FUTEX_WAIT, r5 | |
mov r10, r6 | |
mov r15, r7 | |
mov #SYS_futex, r3 | |
extu.b r3, r3 | |
trapa #0x14 | |
SYSCALL_INST_PAD | |
mov r0, r4 | |
mov #1, r10 | |
XADD (r10, @r8, r3) | |
tst r3, r3 | |
bf 7f | |
mov #2, r1 | |
mov.l r1, @r8 | |
mov #0, r0 | |
6: | |
add #8, r15 | |
mov.l @r15+, r8 | |
mov.l @r15+, r9 | |
rts | |
mov.l @r15+, r10 | |
7: | |
/* Check whether the time expired. */ | |
mov #-ETIMEDOUT, r1 | |
cmp/eq r4, r1 | |
bt 5f | |
bra 1b | |
nop | |
3: | |
rts | |
mov #EINVAL, r0 | |
5: | |
bra 6b | |
mov #ETIMEDOUT, r0 | |
.L1k: | |
.word 1000 | |
.align 2 | |
.L1g: | |
.long 1000000000 | |
.size __lll_mutex_timedlock_wait,.-__lll_mutex_timedlock_wait | |
#endif | |
.globl __lll_mutex_unlock_wake | |
.type __lll_mutex_unlock_wake,@function | |
.hidden __lll_mutex_unlock_wake | |
.align 5 | |
__lll_mutex_unlock_wake: | |
mov #FUTEX_WAKE, r5 | |
mov #1, r6 /* Wake one thread. */ | |
mov #0, r7 | |
mov.l r7, @r4 /* Stores 0. */ | |
mov #SYS_futex, r3 | |
extu.b r3, r3 | |
trapa #0x14 | |
SYSCALL_INST_PAD | |
rts | |
nop | |
.size __lll_mutex_unlock_wake,.-__lll_mutex_unlock_wake |