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253 lines
4.3 KiB
ArmAsm
253 lines
4.3 KiB
ArmAsm
/* Copyright (C) 2003-2014 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, see
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<http://www.gnu.org/licenses/>. */
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#include <sysdep.h>
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#include <lowlevellock.h>
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#include <lowlevelrwlock.h>
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#include <pthread-errnos.h>
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#include <tcb-offsets.h>
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#include <kernel-features.h>
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#include "lowlevel-atomic.h"
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.text
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.globl __pthread_rwlock_wrlock
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.type __pthread_rwlock_wrlock,@function
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.align 5
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cfi_startproc
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__pthread_rwlock_wrlock:
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mov.l r12, @-r15
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (r12, 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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sts.l pr, @-r15
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cfi_adjust_cfa_offset (4)
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cfi_rel_offset (pr, 0)
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mov r4, r8
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/* Get the lock. */
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mov #0, r3
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mov #1, r4
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#if MUTEX == 0
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CMPXCHG (r3, @r8, r4, r2)
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#else
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CMPXCHG (r3, @(MUTEX,r8), r4, r2)
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#endif
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bf 1f
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2:
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mov.l @(WRITER,r8), r0
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tst r0, r0
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bf 14f
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mov.l @(NR_READERS,r8), r0
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tst r0, r0
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bt 5f
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3:
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mov.l @(WRITERS_QUEUED,r8), r0
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add #1, r0
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mov.l r0, @(WRITERS_QUEUED,r8)
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tst r0, r0
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bt 4f
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mov.l @(WRITERS_WAKEUP,r8), r9
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#if MUTEX == 0
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DEC (@r8, r2)
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#else
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DEC (@(MUTEX,r8), r2)
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#endif
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tst r2, r2
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bf 10f
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11:
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mov r8, r4
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add #WRITERS_WAKEUP, r4
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#ifdef __ASSUME_PRIVATE_FUTEX
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mov #PSHARED, r0
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mov.b @(r0,r8), r5
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mov #(FUTEX_PRIVATE_FLAG|FUTEX_WAIT), r0
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xor r0, r5
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extu.b r5, r5
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#else
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mov #PSHARED, r0
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mov.b @(r0,r8), r5
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extu.b r5, r5
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# if FUTEX_WAIT != 0
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mov #FUTEX_WAIT, r0
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or r0, r5
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# endif
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stc gbr, r1
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mov.w .Lpfoff, r2
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add r2, r1
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mov.l @r1, r0
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xor r0, r5
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#endif
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mov r9, r6
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mov #0, 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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/* Reget the lock. */
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mov #0, r3
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mov #1, r4
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#if MUTEX == 0
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CMPXCHG (r3, @r8, r4, r2)
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#else
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CMPXCHG (r3, @(MUTEX,r8), r4, r2)
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#endif
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bf 12f
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13:
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mov.l @(WRITERS_QUEUED,r8), r0
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add #-1, r0
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bra 2b
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mov.l r0, @(WRITERS_QUEUED,r8)
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5:
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mov #0, r3
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stc gbr, r0
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mov.w .Ltidoff, r1
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mov.l @(r0,r1), r0
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mov.l r0, @(WRITER,r8)
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9:
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#if MUTEX == 0
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DEC (@r8, r2)
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#else
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DEC (@(MUTEX,r8), r2)
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#endif
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tst r2, r2
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bf 6f
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7:
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cfi_remember_state
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lds.l @r15+, pr
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cfi_adjust_cfa_offset (-4)
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cfi_restore (pr)
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mov.l @r15+, r8
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cfi_adjust_cfa_offset (-4)
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cfi_restore (r8)
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mov.l @r15+, r9
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cfi_adjust_cfa_offset (-4)
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cfi_restore (r9)
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mov.l @r15+, r12
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cfi_adjust_cfa_offset (-4)
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cfi_restore (r12)
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rts
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mov r3, r0
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cfi_restore_state
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1:
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mov r8, r5
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#if MUTEX != 0
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add #MUTEX, r5
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#endif
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mov #PSHARED, r0
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mov.b @(r0,r8), r6
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extu.b r6, r6
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mov.l .Lwait4, r1
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bsrf r1
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mov r2, r4
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.Lwait4b:
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bra 2b
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nop
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14:
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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, r1
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cmp/eq r1, r0
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bf 3b
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bra 9b
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mov #EDEADLK, r3
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6:
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mov r8, r4
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#if MUTEX != 0
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add #MUTEX, r4
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#endif
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mov #PSHARED, r0
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mov.b @(r0,r8), r5
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extu.b r5, r5
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mov.l .Lwake4, r1
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bsrf r1
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nop
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.Lwake4b:
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bra 7b
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mov #0, r3
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#ifndef __ASSUME_PRIVATE_FUTEX
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.Lpfoff:
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.word PRIVATE_FUTEX - TLS_PRE_TCB_SIZE
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#endif
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.Ltidoff:
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.word TID - TLS_PRE_TCB_SIZE
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4:
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mov.l @(WRITERS_QUEUED,r8), r1
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add #-1, r1
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mov.l r1, @(WRITERS_QUEUED,r8)
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bra 9b
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mov #EAGAIN, r3
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10:
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mov r8, r4
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#if MUTEX != 0
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add #MUTEX, r4
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#endif
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mov #PSHARED, r0
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mov.b @(r0,r8), r5
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extu.b r5, r5
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mov.l .Lwake5, r1
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bsrf r1
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nop
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.Lwake5b:
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bra 11b
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nop
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12:
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mov r8, r5
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#if MUTEX != 0
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add #MUTEX, r5
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#endif
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mov #PSHARED, r0
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mov.b @(r0,r8), r6
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extu.b r6, r6
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mov.l .Lwait5, r1
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bsrf r1
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mov r2, r4
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.Lwait5b:
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bra 13b
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nop
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cfi_endproc
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.align 2
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.Lwait4:
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.long __lll_lock_wait-.Lwait4b
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.Lwake4:
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.long __lll_unlock_wake-.Lwake4b
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.Lwait5:
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.long __lll_lock_wait-.Lwait5b
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.Lwake5:
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.long __lll_unlock_wake-.Lwake5b
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strong_alias (__pthread_rwlock_wrlock, pthread_rwlock_wrlock)
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hidden_def (__pthread_rwlock_wrlock)
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