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/* Copyright (C) 2003, 2004, 2005, 2006, 2007
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, see
<http://www.gnu.org/licenses/>. */
#include <sysdep.h>
#include <pthread-errnos.h>
#include <lowlevellock.h>
#include <lowlevelrobustlock.h>
#include <bits/kernel-features.h>
#include <tcb-offsets.h>
#include "lowlevel-atomic.h"
.text
#define FUTEX_WAITERS 0x80000000
#define FUTEX_OWNER_DIED 0x40000000
#ifdef __ASSUME_PRIVATE_FUTEX
# define LOAD_FUTEX_WAIT(reg,tmp,tmp2) \
mov #(FUTEX_WAIT | FUTEX_PRIVATE_FLAG), tmp; \
extu.b tmp, tmp; \
xor tmp, reg
#else
# if FUTEX_WAIT == 0
# define LOAD_FUTEX_WAIT(reg,tmp,tmp2) \
stc gbr, tmp ; \
mov.w 99f, tmp2 ; \
add tmp2, tmp ; \
mov.l @tmp, tmp2 ; \
bra 98f ; \
mov #FUTEX_PRIVATE_FLAG, tmp ; \
99: .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE ; \
98: extu.b tmp, tmp ; \
xor tmp, reg ; \
and tmp2, reg
# else
# define LOAD_FUTEX_WAIT(reg,tmp,tmp2) \
stc gbr, tmp ; \
mov.w 99f, tmp2 ; \
add tmp2, tmp ; \
mov.l @tmp, tmp2 ; \
bra 98f ; \
mov #FUTEX_PRIVATE_FLAG, tmp ; \
99: .word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE ; \
98: extu.b tmp, tmp ; \
xor tmp, reg ; \
and tmp2, reg ; \
mov #FUTEX_WAIT, tmp ; \
or tmp, reg
# endif
#endif
.globl __lll_robust_lock_wait
.type __lll_robust_lock_wait,@function
.hidden __lll_robust_lock_wait
.align 5
cfi_startproc
__lll_robust_lock_wait:
mov.l r8, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r8, 0)
mov r5, r8
mov #0, r7 /* No timeout. */
mov r6, r5
LOAD_FUTEX_WAIT (r5, r0, r1)
4:
mov r4, r6
mov.l .L_FUTEX_WAITERS, r0
or r0, r6
shlr r0 /* r0 = FUTEX_OWNER_DIED */
tst r0, r4
bf/s 3f
cmp/eq r4, r6
bt 1f
CMPXCHG (r4, @r8, r6, r2)
bf 2f
1:
mov r8, r4
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
mov.l @r8, r2
2:
tst r2, r2
bf/s 4b
mov r2, r4
stc gbr, r1
mov.w .Ltidoff, r2
add r2, r1
mov.l @r1, r6
mov #0, r3
CMPXCHG (r3, @r8, r6, r4)
bf 4b
mov #0, r4
3:
mov.l @r15+, r8
ret
mov r4, r0
cfi_endproc
.align 2
.L_FUTEX_WAITERS:
.long FUTEX_WAITERS
.Ltidoff:
.word TID - TLS_PRE_TCB_SIZE
.size __lll_robust_lock_wait,.-__lll_robust_lock_wait
.globl __lll_robust_timedlock_wait
.type __lll_robust_timedlock_wait,@function
.hidden __lll_robust_timedlock_wait
.align 5
cfi_startproc
__lll_robust_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 r11, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r11, 0)
mov.l r10, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r10, 0)
mov.l r9, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r9, 0)
mov.l r8, @-r15
cfi_adjust_cfa_offset(4)
cfi_rel_offset (r8, 0)
mov r7, r11
mov r4, r10
mov r6, r9
mov r5, r8
/* Stack frame for the timespec and timeval structs. */
add #-8, r15
cfi_adjust_cfa_offset(8)
1:
/* Get current time. */
mov r15, r4
mov #0, r5
mov #__NR_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 8f /* Time is already up. */
mov.l r2, @r15 /* Store relative timeout. */
mov.l r3, @(4,r15)
mov r10, r6
mov.l .L_FUTEX_WAITERS2, r0
or r0, r6
shlr r0 /* r0 = FUTEX_OWNER_DIED */
tst r0, r4
bf/s 6f
cmp/eq r4, r6
bt 2f
CMPXCHG (r4, @r8, r6, r2)
bf/s 5f
mov #0, r5
2:
mov r8, r4
mov r11, r5
LOAD_FUTEX_WAIT (r5, r0, r1)
mov r10, r6
mov r15, r7
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
mov r0, r5
mov.l @r8, r2
5:
tst r2, r2
bf/s 7f
mov r2, r10
stc gbr, r1
mov.w .Ltidoff2, r2
add r2, r1
mov.l @r1, r4
mov #0, r3
CMPXCHG (r3, @r8, r4, r10)
bf 7f
mov #0, r0
6:
add #8, r15
mov.l @r15+, r8
mov.l @r15+, r9
mov.l @r15+, r10
rts
mov.l @r15+, r11
7:
/* Check whether the time expired. */
mov #-ETIMEDOUT, r1
cmp/eq r5, r1
bf 1b
8:
bra 6b
mov #ETIMEDOUT, r0
3:
rts
mov #EINVAL, r0
cfi_endproc
.align 2
.L_FUTEX_WAITERS2:
.long FUTEX_WAITERS
.L1g:
.long 1000000000
.Ltidoff2:
.word TID - TLS_PRE_TCB_SIZE
.L1k:
.word 1000
.size __lll_robust_timedlock_wait,.-__lll_robust_timedlock_wait
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