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https://sourceware.org/git/glibc.git
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225 lines
4.1 KiB
ArmAsm
225 lines
4.1 KiB
ArmAsm
/* Copyright (C) 2003, 2004, 2005, 2006 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <sysdep.h>
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#include <pthread-errnos.h>
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#include <lowlevelrobustlock.h>
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#include "lowlevel-atomic.h"
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.text
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#define SYS_gettimeofday __NR_gettimeofday
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#define SYS_futex 240
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#define FUTEX_WAIT 0
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#define FUTEX_WAKE 1
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#define FUTEX_WAITERS 0x80000000
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#define FUTEX_OWNER_DIED 0x40000000
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.globl __lll_robust_mutex_lock_wait
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.type __lll_robust_mutex_lock_wait,@function
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.hidden __lll_robust_mutex_lock_wait
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.align 5
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cfi_startproc
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__lll_robust_mutex_lock_wait:
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mov.l r8, @-r15
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cfi_adjust_cfa_offset(4)
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cfi_rel_offset (r8, 0)
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mov r5, r8
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mov #0, r7 /* No timeout. */
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mov #FUTEX_WAIT, r5
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4:
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mov r4, r6
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mov.l .L_FUTEX_WAITERS, r0
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or r0, r6
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shlr r0 /* r0 = FUTEX_OWNER_DIED */
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tst r0, r4
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bf/s 3f
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cmp/eq r4, r6
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bt 1f
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CMPXCHG (r4, @r8, r6, r2)
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bf 2f
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1:
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mov r8, r4
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mov #SYS_futex, r3
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extu.b r3, r3
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trapa #0x14
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SYSCALL_INST_PAD
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mov.l @r8, r2
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2:
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tst r2, r2
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bf/s 4b
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mov r2, r4
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stc gbr, r1
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mov.w .Ltidoff, r2
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add r2, r1
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mov.l @r1, r6
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mov #0, r3
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CMPXCHG (r3, @r8, r6, r4)
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bf 4b
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mov #0, r4
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3:
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mov.l @r15+, r8
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ret
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mov r4, r0
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cfi_endproc
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.align 2
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.L_FUTEX_WAITERS:
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.long FUTEX_WAITERS
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.Ltidoff:
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.word TID - TLS_PRE_TCB_SIZE
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.size __lll_robust_mutex_lock_wait,.-__lll_robust_mutex_lock_wait
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.globl __lll_robust_mutex_timedlock_wait
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.type __lll_robust_mutex_timedlock_wait,@function
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.hidden __lll_robust_mutex_timedlock_wait
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.align 5
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cfi_startproc
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__lll_robust_mutex_timedlock_wait:
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/* Check for a valid timeout value. */
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mov.l @(4,r6), r1
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mov.l .L1g, r0
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cmp/hs r0, r1
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bt 3f
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mov.l r10, @-r15
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cfi_adjust_cfa_offset(4)
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cfi_rel_offset (r10, 0)
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mov.l r9, @-r15
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cfi_adjust_cfa_offset(4)
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cfi_rel_offset (r9, 0)
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mov.l r8, @-r15
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cfi_adjust_cfa_offset(4)
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cfi_rel_offset (r8, 0)
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mov r4, r10
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mov r6, r9
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mov r5, r8
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/* Stack frame for the timespec and timeval structs. */
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add #-8, r15
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cfi_adjust_cfa_offset(8)
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1:
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/* Get current time. */
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mov r15, r4
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mov #0, r5
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mov #SYS_gettimeofday, r3
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trapa #0x12
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SYSCALL_INST_PAD
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/* Compute relative timeout. */
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mov.l @(4,r15), r0
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mov.w .L1k, r1
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dmulu.l r0, r1 /* Micro seconds to nano seconds. */
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mov.l @r9, r2
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mov.l @(4,r9), r3
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mov.l @r15, r0
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sts macl, r1
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sub r0, r2
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clrt
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subc r1, r3
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bf 4f
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mov.l .L1g, r1
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add r1, r3
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add #-1, r2
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4:
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cmp/pz r2
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bf 8f /* Time is already up. */
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mov.l r2, @r15 /* Store relative timeout. */
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mov.l r3, @(4,r15)
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mov r10, r6
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mov.l .L_FUTEX_WAITERS2, r0
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or r0, r6
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shlr r0 /* r0 = FUTEX_OWNER_DIED */
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tst r0, r4
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bf/s 6f
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cmp/eq r4, r6
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bt 2f
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CMPXCHG (r4, @r8, r6, r2)
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bf/s 5f
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mov #0, r5
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2:
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mov r8, r4
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mov #FUTEX_WAIT, r5
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mov r10, r6
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mov r15, r7
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mov #SYS_futex, r3
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extu.b r3, r3
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trapa #0x14
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SYSCALL_INST_PAD
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mov r0, r5
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mov.l @r8, r2
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5:
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tst r2, r2
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bf/s 7f
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mov r2, r10
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stc gbr, r1
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mov.w .Ltidoff2, r2
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add r2, r1
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mov.l @r1, r4
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mov #0, r3
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CMPXCHG (r3, @r8, r4, r10)
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bf 7f
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mov #0, r0
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6:
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add #8, r15
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mov.l @r15+, r8
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mov.l @r15+, r9
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rts
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mov.l @r15+, r10
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7:
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/* Check whether the time expired. */
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mov #-ETIMEDOUT, r1
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cmp/eq r5, r1
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bf 1b
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8:
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bra 6b
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mov #ETIMEDOUT, r0
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3:
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rts
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mov #EINVAL, r0
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cfi_endproc
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.align 2
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.L_FUTEX_WAITERS2:
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.long FUTEX_WAITERS
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.L1g:
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.long 1000000000
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.Ltidoff2:
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.word TID - TLS_PRE_TCB_SIZE
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.L1k:
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.word 1000
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.size __lll_robust_mutex_timedlock_wait,.-__lll_robust_mutex_timedlock_wait
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