diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/sh/pthread_rwlock_wrlock.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/sh/pthread_rwlock_wrlock.S | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/sh/pthread_rwlock_wrlock.S b/nptl/sysdeps/unix/sysv/linux/sh/pthread_rwlock_wrlock.S new file mode 100644 index 0000000000..20c84235ce --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/sh/pthread_rwlock_wrlock.S @@ -0,0 +1,202 @@ +/* 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 <lowlevelrwlock.h> +#include <tcb-offsets.h> +#include "lowlevel-atomic.h" + +#define SYS_futex 240 +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 + +#define EAGAIN 11 +#define EDEADLK 35 + + + .text + + .globl __pthread_rwlock_wrlock + .type __pthread_rwlock_wrlock,@function + .align 5 +__pthread_rwlock_wrlock: + mov.l r12, @-r15 + mov.l r8, @-r15 + sts.l pr, @-r15 + mov r4, r8 + + /* Get the lock. */ + mov #1, r3 +#if MUTEX == 0 + XADD (r3, @r4, r2) +#else + XADD (r3, @(MUTEX,r4), r2) +#endif + tst r2, r2 + bf 1f +2: + mov.l @(WRITER,r8), r0 + tst r0, r0 + bf 14f + mov.l @(NR_READERS,r8), r0 + tst r0, r0 + bt 5f +3: + mov.l @(WRITERS_QUEUED,r8), r0 + add #1, r0 + mov.l r0, @(WRITERS_QUEUED,r8) + tst r0, r0 + bt 4f + +#if MUTEX == 0 + DEC (@r8, r2) +#else + DEC (@(MUTEX,r8), r2) +#endif + tst r2, r2 + bf 10f +11: + mov r8, r4 + add #WRITERS_WAKEUP, r4 + mov #FUTEX_WAIT, r5 + mov #0, r6 + mov #SYS_futex, r3 + extu.b r3, r3 + trapa #0x14 + SYSCALL_INST_PAD + + /* Reget the lock. */ + mov #1, r3 +#if MUTEX == 0 + XADD (r3, @r4, r2) +#else + XADD (r3, @(MUTEX,r4), r2) +#endif + tst r2, r2 + bf 12f +13: + mov.l @(READERS_QUEUED,r8), r0 + add #-1, r0 + mov.l r0, @(READERS_QUEUED,r8) + mov #0, r0 + bra 2b + mov.l r0, @(WRITERS_WAKEUP,r8) + +5: + mov #0, r3 + stc gbr, r1 + mov.w .Ltcboff,r2 + sub r2,r1 + mov.l @(8,r1),r0 + mov.l r0, @(WRITER,r8) +9: +#if MUTEX == 0 + DEC (@r8, r2) +#else + DEC (@(MUTEX,r8), r2) +#endif + tst r2, r2 + bf 6f +7: + lds.l @r15+, pr + mov.l @r15+, r8 + mov.l @r15+, r12 + rts + mov r3, r0 + +1: + mov r8, r5 +#if MUTEX != 0 + add #MUTEX, r5 +#endif + mov r2, r4 + mov.l .Lwait4, r1 + bsrf r1 + nop +.Lwait4b: + bra 2b + nop +14: + stc gbr, r1 + mov.w .Ltcboff,r2 + sub r2,r1 + mov.l @(8,r1),r1 + cmp/eq r1, r0 + bf 3b + bra 9b + mov #EDEADLK, r3 +6: + mov r8, r4 +#if MUTEX != 0 + add #MUTEX, r4 +#endif + mov.l .Lwake4, r1 + bsrf r1 + nop +.Lwake4b: + bra 7b + mov #0, r3 + +4: + mov.l @(WRITERS_QUEUED,r8), r1 + add #-1, r1 + mov.l r1, @(WRITERS_QUEUED,r8) + bra 9b + mov #EAGAIN, r3 + +10: + mov r8, r4 +#if MUTEX != 0 + add #MUTEX, r4 +#endif + mov.l .Lwake5, r1 + bsrf r1 + nop +.Lwake5b: + bra 11b + nop + +12: + mov r8, r5 +#if MUTEX != 0 + add #MUTEX, r5 +#endif + mov r2, r4 + mov.l .Lwait5, r1 + bsrf r1 + nop +.Lwait5b: + bra 13b + nop + +.Ltcboff: + .word TLS_PRE_TCB_SIZE + .align 2 +.Lwait4: + .long __lll_mutex_lock_wait-.Lwait4b +.Lwake4: + .long __lll_mutex_unlock_wake-.Lwake4b +.Lwait5: + .long __lll_mutex_lock_wait-.Lwait5b +.Lwake5: + .long __lll_mutex_unlock_wake-.Lwake5b + .globl pthread_rwlock_wrlock +pthread_rwlock_wrlock = __pthread_rwlock_wrlock + + .globl __pthread_rwlock_wrlock_internal +__pthread_rwlock_wrlock_internal = __pthread_rwlock_wrlock |