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|
/* Copyright (C) 2003, 2004, 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, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#include <sysdep.h>
#include <shlib-compat.h>
#include <lowlevellock.h>
#include <lowlevelcond.h>
#include <tcb-offsets.h>
#include <kernel-features.h>
#include "lowlevel-atomic.h"
.text
/* int pthread_cond_wait (pthread_cond_t *cond, pthread_mutex_t *mutex) */
.globl __pthread_cond_wait
.type __pthread_cond_wait, @function
.align 5
__pthread_cond_wait:
.LSTARTCODE:
mov.l r8, @-r15
.Lpush_r8:
mov.l r9, @-r15
.Lpush_r9:
mov.l r10, @-r15
.Lpush_r10:
mov.l r11, @-r15
.Lpush_r11:
mov.l r12, @-r15
.Lpush_r12:
sts.l pr, @-r15
.Lpush_pr:
add #-48, r15
.Lalloc:
mov r4, r8
mov r5, r9
#ifdef PIC
mova .Lgot0, r0
mov.l .Lgot0, r12
add r0, r12
#endif
/* Get internal lock. */
mov #0, r3
mov #1, r4
#if cond_lock != 0
CMPXCHG (r3, @(cond_lock,r8), r4, r2)
#else
CMPXCHG (r3, @r8, r4, r2)
#endif
bt 2f
bra 1f
nop
#ifdef PIC
.align 2
.Lgot0:
.long _GLOBAL_OFFSET_TABLE_
#endif
2:
/* Store the reference to the mutex. If there is already a
different value in there this is a bad user bug. */
mov.l @(dep_mutex,r8),r0
cmp/eq #-1, r0
bt 15f
mov.l r9, @(dep_mutex,r8)
15:
/* Unlock the mutex. */
mov.l .Lmunlock0, r1
mov #0, r5
bsrf r1
mov r9, r4
.Lmunlock0b:
tst r0, r0
bt 0f
bra 12f
nop
0:
mov #1, r2
mov #0, r3
clrt
mov.l @(total_seq,r8),r0
mov.l @(total_seq+4,r8),r1
addc r2, r0
addc r3, r1
mov.l r0,@(total_seq,r8)
mov.l r1,@(total_seq+4,r8)
mov.l @(cond_futex,r8),r0
add r2, r0
mov.l r0,@(cond_futex,r8)
mov #(1 << nwaiters_shift), r2
mov.l @(cond_nwaiters,r8), r0
add r2, r0
mov.l r0, @(cond_nwaiters,r8)
/* Get and store current wakeup_seq value. */
mov.l @(wakeup_seq,r8), r10
mov.l @(wakeup_seq+4,r8), r11
mov.l @(broadcast_seq,r8), r0
mov.l r0, @(4,r15)
8:
mov.l @(cond_futex,r8),r0
mov.l r0, @(8,r15)
/* Unlock. */
#if cond_lock != 0
DEC (@(cond_lock,r8), r2)
#else
DEC (@r8, r2)
#endif
tst r2, r2
bf 3f
4:
.LcleanupSTART:
mov.l .Lenable0, r1
bsrf r1
nop
.Lenable0b:
mov.l r0, @r15
mov #0, r7
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bt/s 99f
mov #FUTEX_WAIT, r5
#ifdef __ASSUME_PRIVATE_FUTEX
mov #(FUTEX_WAIT|FUTEX_PRIVATE_FLAG), r5
extu.b r5, r5
#else
stc gbr, r1
mov.w .Lpfoff0, r2
add r2, r1
mov.l @r1, r5
mov #FUTEX_WAIT, r0
or r0, r5
#endif
99:
mov.l @(8,r15), r6
mov r8, r4
add #cond_futex, r4
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
mov.l .Ldisable0, r1
bsrf r1
mov.l @r15, r4
.Ldisable0b:
.LcleanupEND:
/* Lock. */
mov #0, r3
mov #1, r4
#if cond_lock != 0
CMPXCHG (r3, @(cond_lock,r8), r4, r2)
#else
CMPXCHG (r3, @r8, r4, r2)
#endif
bf 5f
6:
mov.l @(broadcast_seq,r8), r0
mov.l @(4,r15), r1
cmp/eq r0, r1
bf 16f
mov.l @(woken_seq,r8), r0
mov.l @(woken_seq+4,r8), r1
mov.l @(wakeup_seq,r8), r2
mov.l @(wakeup_seq+4,r8), r3
cmp/eq r3, r11
bf 7f
cmp/eq r2, r10
bt 8b
7:
cmp/eq r1, r3
bf 9f
cmp/eq r0, r2
bt 8b
9:
mov #1, r2
mov #0, r3
clrt
mov.l @(woken_seq,r8),r0
mov.l @(woken_seq+4,r8),r1
addc r2, r0
addc r3, r1
mov.l r0,@(woken_seq,r8)
mov.l r1,@(woken_seq+4,r8)
16:
mov #(1 << nwaiters_shift), r2
mov.l @(cond_nwaiters,r8),r0
sub r2, r0
mov.l r0,@(cond_nwaiters,r8)
/* Wake up a thread which wants to destroy the condvar object. */
mov.l @(total_seq,r8),r0
mov.l @(total_seq+4,r8),r1
and r1, r0
not r0, r0
cmp/eq #0, r0
bf/s 17f
mov #((1 << nwaiters_shift) - 1), r1
not r1, r1
mov.l @(cond_nwaiters,r8),r0
tst r1, r0
bf 17f
mov r8, r4
add #cond_nwaiters, r4
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bt/s 99f
mov #FUTEX_WAKE, r5
#ifdef __ASSUME_PRIVATE_FUTEX
mov #(FUTEX_WAKE|FUTEX_PRIVATE_FLAG), r5
extu.b r5, r5
#else
stc gbr, r1
mov.w .Lpfoff0, r2
add r2, r1
mov.l @r1, r5
mov #FUTEX_WAKE, r0
or r0, r5
#endif
99:
mov #1, r6
mov #0, r7
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
17:
#if cond_lock != 0
DEC (@(cond_lock,r8), r2)
#else
DEC (@r8, r2)
#endif
tst r2, r2
bf 10f
11:
mov.l .Lmlocki0, r1
bsrf r1
mov r9, r4
.Lmlocki0b:
/* We return the result of the mutex_lock operation. */
14:
add #48, r15
lds.l @r15+, pr
mov.l @r15+, r12
mov.l @r15+, r11
mov.l @r15+, r10
mov.l @r15+, r9
rts
mov.l @r15+, r8
#ifndef __ASSUME_PRIVATE_FUTEX
.Lpfoff0:
.word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE
#endif
.align 2
.Lmunlock0:
.long __pthread_mutex_unlock_usercnt-.Lmunlock0b
.Lenable0:
.long __pthread_enable_asynccancel-.Lenable0b
.Ldisable0:
.long __pthread_disable_asynccancel-.Ldisable0b
.Lmlocki0:
.long __pthread_mutex_cond_lock-.Lmlocki0b
1:
/* Initial locking failed. */
mov r8, r5
#if cond_lock != 0
add #cond_lock, r5
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r6
mov #LLL_SHARED, r6
99:
extu.b r6, r6
mov.l .Lwait0, r1
bsrf r1
mov r2, r4
.Lwait0b:
bra 2b
nop
3:
/* Unlock in loop requires waekup. */
mov r8, r4
#if cond_lock != 0
add #cond_lock, r4
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r5
mov #LLL_SHARED, r5
99:
mov.l .Lwake0, r1
bsrf r1
extu.b r5, r5
.Lwake0b:
bra 4b
nop
5:
/* Locking in loop failed. */
mov r8, r5
#if cond_lock != 0
add #cond_lock, r5
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r6
mov #LLL_SHARED, r6
99:
extu.b r6, r6
mov.l .Lwait1, r1
bsrf r1
mov r2, r4
.Lwait1b:
bra 6b
nop
10:
/* Unlock after loop requires wakeup. */
mov r8, r4
#if cond_lock != 0
add #cond_lock, r4
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r5
mov #LLL_SHARED, r5
99:
mov.l .Lwake1, r1
bsrf r1
extu.b r5, r5
.Lwake1b:
bra 11b
nop
12:
/* The initial unlocking of the mutex failed. */
mov.l r0, @(12,r15)
#if cond_lock != 0
DEC (@(cond_lock,r8), r2)
#else
DEC (@r8, r2)
#endif
tst r2, r2
bf 13f
mov r8, r4
#if cond_lock != 0
add #cond_lock, r4
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r5
mov #LLL_SHARED, r5
99:
mov.l .Lwake2, r1
bsrf r1
extu.b r5, r5
.Lwake2b:
13:
bra 14b
mov.l @(12,r15), r0
.align 2
.Lwait0:
.long __lll_lock_wait-.Lwait0b
.Lwake0:
.long __lll_unlock_wake-.Lwake0b
.Lwait1:
.long __lll_lock_wait-.Lwait1b
.Lwake1:
.long __lll_unlock_wake-.Lwake1b
.Lwake2:
.long __lll_unlock_wake-.Lwake2b
.size __pthread_cond_wait, .-__pthread_cond_wait
versioned_symbol (libpthread, __pthread_cond_wait, pthread_cond_wait,
GLIBC_2_3_2)
.type __condvar_w_cleanup, @function
__condvar_w_cleanup:
mov r4, r11
/* Get internal lock. */
mov #0, r3
mov #1, r4
#if cond_lock != 0
CMPXCHG (r3, @(cond_lock,r8), r4, r2)
#else
CMPXCHG (r3, @r8, r4, r2)
#endif
bt 1f
nop
mov r8, r5
#if cond_lock != 0
add #cond_lock, r5
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r6
mov #LLL_SHARED, r6
99:
extu.b r6, r6
mov.l .Lwait3, r1
bsrf r1
mov r2, r4
.Lwait3b:
1:
mov.l @(broadcast_seq,r8), r0
mov.l @(4,r15), r1
cmp/eq r0, r1
bf 3f
mov #1, r2
mov #0, r3
/* We increment the wakeup_seq counter only if it is lower than
total_seq. If this is not the case the thread was woken and
then canceled. In this case we ignore the signal. */
mov.l @(total_seq+4,r8), r0
mov.l @(wakeup_seq+4,r8), r1
cmp/hi r1, r0
bt/s 6f
cmp/hi r0, r1
bt 7f
mov.l @(total_seq,r8), r0
mov.l @(wakeup_seq,r8), r1
cmp/hs r0, r1
bt 7f
6:
clrt
mov.l @(wakeup_seq,r8),r0
mov.l @(wakeup_seq+4,r8),r1
addc r2, r0
addc r3, r1
mov.l r0,@(wakeup_seq,r8)
mov.l r1,@(wakeup_seq+4,r8)
mov.l @(cond_futex,r8),r0
add r2, r0
mov.l r0,@(cond_futex,r8)
7:
clrt
mov.l @(woken_seq,r8),r0
mov.l @(woken_seq+4,r8),r1
addc r2, r0
addc r3, r1
mov.l r0,@(woken_seq,r8)
mov.l r1,@(woken_seq+4,r8)
3:
mov #(1 << nwaiters_shift), r2
mov.l @(cond_nwaiters,r8),r0
sub r2, r0
mov.l r0,@(cond_nwaiters,r8)
/* Wake up a thread which wants to destroy the condvar object. */
mov #0, r10
mov.l @(total_seq,r8),r0
mov.l @(total_seq+4,r8),r1
and r1, r0
not r0, r0
cmp/eq #0, r0
bf/s 4f
mov #((1 << nwaiters_shift) - 1), r1
not r1, r1
mov.l @(cond_nwaiters,r8),r0
tst r1, r0
bf 4f
mov r8, r4
add #cond_nwaiters, r4
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bt/s 99f
mov #FUTEX_WAKE, r5
#ifdef __ASSUME_PRIVATE_FUTEX
mov #(FUTEX_WAKE|FUTEX_PRIVATE_FLAG), r5
extu.b r5, r5
#else
stc gbr, r1
mov.w .Lpfoff1, r2
add r2, r1
mov.l @r1, r5
mov #FUTEX_WAKE, r0
or r0, r5
#endif
99:
mov #1, r6
mov #0, r7
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
mov #1, r10
4:
#if cond_lock != 0
DEC (@(cond_lock,r8), r2)
#else
DEC (@r8, r2)
#endif
tst r2, r2
bt 2f
mov r8, r4
#if cond_lock != 0
add #cond_lock, r4
#endif
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bf/s 99f
mov #LLL_PRIVATE, r5
mov #LLL_SHARED, r5
99:
mov.l .Lwake3, r1
bsrf r1
extu.b r5, r5
.Lwake3b:
2:
/* Wake up all waiters to make sure no signal gets lost. */
tst r10, r10
bf/s 5f
mov r8, r4
add #cond_futex, r4
mov.l @(dep_mutex,r8), r0
cmp/eq #-1, r0
bt/s 99f
mov #FUTEX_WAKE, r5
#ifdef __ASSUME_PRIVATE_FUTEX
mov #(FUTEX_WAKE|FUTEX_PRIVATE_FLAG), r5
extu.b r5, r5
#else
stc gbr, r1
mov.w .Lpfoff1, r2
add r2, r1
mov.l @r1, r5
mov #FUTEX_WAKE, r0
or r0, r5
#endif
99:
mov #-1, r6
shlr r6 /* r6 = 0x7fffffff */
mov #0, r7
mov #SYS_futex, r3
extu.b r3, r3
trapa #0x14
SYSCALL_INST_PAD
5:
mov.l .Lmlocki3, r1
bsrf r1
mov r9, r4
.Lmlocki3b:
.LcallUR:
mov.l .Lresume, r1
#ifdef PIC
add r12, r1
#endif
jsr @r1
mov r11, r4
sleep
#ifndef __ASSUME_PRIVATE_FUTEX
.Lpfoff1:
.word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE
#endif
.align 2
.Lwait3:
.long __lll_lock_wait-.Lwait3b
.Lwake3:
.long __lll_unlock_wake-.Lwake3b
.Lmlocki3:
.long __pthread_mutex_cond_lock-.Lmlocki3b
.Lresume:
#ifdef PIC
.long _Unwind_Resume@GOTOFF
#else
.long _Unwind_Resume
#endif
.LENDCODE:
.size __condvar_w_cleanup, .-__condvar_w_cleanup
.section .gcc_except_table,"a",@progbits
.LexceptSTART:
.byte 0xff ! @LPStart format (omit)
.byte 0xff ! @TType format (omit)
.byte 0x0b ! call-site format
! DW_EH_PE_sdata4
.uleb128 .Lcstend-.Lcstbegin
.Lcstbegin:
.ualong .LcleanupSTART-.LSTARTCODE
.ualong .LcleanupEND-.LcleanupSTART
.ualong __condvar_w_cleanup-.LSTARTCODE
.uleb128 0
.ualong .LcallUR-.LSTARTCODE
.ualong .LENDCODE-.LcallUR
.ualong 0
.uleb128 0
.Lcstend:
.section .eh_frame,"a",@progbits
.LSTARTFRAME:
.ualong .LENDCIE-.LSTARTCIE ! Length of the CIE.
.LSTARTCIE:
.ualong 0 ! CIE ID.
.byte 1 ! Version number.
#ifdef SHARED
.string "zPLR" ! NUL-terminated augmentation
! string.
#else
.string "zPL" ! NUL-terminated augmentation
! string.
#endif
.uleb128 1 ! Code alignment factor.
.sleb128 -4 ! Data alignment factor.
.byte 0x11 ! Return address register
! column.
#ifdef SHARED
.uleb128 7 ! Augmentation value length.
.byte 0x9b ! Personality: DW_EH_PE_pcrel
! + DW_EH_PE_sdata4
! + DW_EH_PE_indirect
.ualong DW.ref.__gcc_personality_v0-.
.byte 0x1b ! LSDA Encoding: DW_EH_PE_pcrel
! + DW_EH_PE_sdata4.
.byte 0x1b ! FDE Encoding: DW_EH_PE_pcrel
! + DW_EH_PE_sdata4.
#else
.uleb128 6 ! Augmentation value length.
.byte 0x0 ! Personality: absolute
.ualong __gcc_personality_v0
.byte 0x0 ! LSDA Encoding: absolute
#endif
.byte 0x0c ! DW_CFA_def_cfa
.uleb128 0xf
.uleb128 0
.align 2
.LENDCIE:
.ualong .LENDFDE-.LSTARTFDE ! Length of the FDE.
.LSTARTFDE:
.ualong .LSTARTFDE-.LSTARTFRAME ! CIE pointer.
#ifdef SHARED
.ualong .LSTARTCODE-. ! PC-relative start address
! of the code.
#else
.ualong .LSTARTCODE ! Start address of the code.
#endif
.ualong .LENDCODE-.LSTARTCODE ! Length of the code.
.uleb128 4 ! Augmentation size
#ifdef SHARED
.ualong .LexceptSTART-.
#else
.ualong .LexceptSTART
#endif
.byte 0x4
.ualong .Lpush_r8-.LSTARTCODE
.byte 0xe
.uleb128 4
.byte 0x88
.uleb128 1
.byte 0x4
.ualong .Lpush_r9-.Lpush_r8
.byte 0xe
.uleb128 8
.byte 0x89
.uleb128 2
.byte 0x4
.ualong .Lpush_r10-.Lpush_r9
.byte 0xe
.uleb128 12
.byte 0x8a
.uleb128 3
.byte 0x4
.ualong .Lpush_r11-.Lpush_r10
.byte 0xe
.uleb128 16
.byte 0x8b
.uleb128 4
.byte 0x4
.ualong .Lpush_r12-.Lpush_r11
.byte 0xe
.uleb128 20
.byte 0x8c
.uleb128 5
.byte 0x4
.ualong .Lpush_pr-.Lpush_r12
.byte 0xe
.uleb128 24
.byte 0x91
.uleb128 6
.byte 0x4
.ualong .Lalloc-.Lpush_pr
.byte 0xe
.uleb128 72
.align 2
.LENDFDE:
#ifdef SHARED
.hidden DW.ref.__gcc_personality_v0
.weak DW.ref.__gcc_personality_v0
.section .gnu.linkonce.d.DW.ref.__gcc_personality_v0,"aw",@progbits
.align 4
.type DW.ref.__gcc_personality_v0, @object
.size DW.ref.__gcc_personality_v0, 4
DW.ref.__gcc_personality_v0:
.long __gcc_personality_v0
#endif
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