diff options
Diffstat (limited to 'libpthread/nptl/sysdeps/unix/sysv/linux/sh/pthread_rwlock_unlock.S')
| -rw-r--r-- | libpthread/nptl/sysdeps/unix/sysv/linux/sh/pthread_rwlock_unlock.S | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/libpthread/nptl/sysdeps/unix/sysv/linux/sh/pthread_rwlock_unlock.S b/libpthread/nptl/sysdeps/unix/sysv/linux/sh/pthread_rwlock_unlock.S new file mode 100644 index 000000000..a610708c8 --- /dev/null +++ b/libpthread/nptl/sysdeps/unix/sysv/linux/sh/pthread_rwlock_unlock.S @@ -0,0 +1,169 @@ +/* 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 "lowlevel-atomic.h" + +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 + + + .text + + .globl __pthread_rwlock_unlock + .type __pthread_rwlock_unlock,@function + .align 5 +__pthread_rwlock_unlock: + mov.l r12, @-r15 + mov.l r8, @-r15 + sts.l pr, @-r15 + mov r4, r8 + + /* Get the lock. */ + mov #0, r3 + mov #1, r4 +#if MUTEX == 0 + CMPXCHG (r3, @r8, r4, r2) +#else + CMPXCHG (r3, @(MUTEX,r8), r4, r2) +#endif + bf 1f +2: + mov.l @(WRITER,r8), r0 + tst r0, r0 + bf 5f + mov.l @(NR_READERS,r8), r0 + add #-1, r0 + mov.l r0, @(NR_READERS,r8) + tst r0, r0 + bf 6f +5: + mov #0, r0 + mov.l r0, @(WRITER,r8) + mov #1, r6 + mov r8, r4 + add #WRITERS_WAKEUP, r4 + mov.l @(WRITERS_QUEUED,r8), r0 + tst r0, r0 + bf 0f + + /* If also no readers waiting nothing to do. */ + mov.l @(READERS_QUEUED,r8), r0 + tst r0, r0 + bt 6f + + mov #-1, r6 + shlr r6 /* r6 = 0x7fffffff */ + mov r8, r4 + add #READERS_WAKEUP, r4 + +0: + mov.l @r4, r0 + add #1, r0 + mov.l r0, @r4 +#if MUTEX == 0 + DEC (@r8, r2) +#else + DEC (@(MUTEX,r8), r2) +#endif + tst r2, r2 + bf 7f + +8: + mov #FUTEX_WAKE, r5 + mov #SYS_futex, r3 + mov #0, r7 + extu.b r3, r3 + trapa #0x14 + SYSCALL_INST_PAD + + lds.l @r15+, pr + mov.l @r15+, r8 + mov.l @r15+, r12 + rts + mov #0, r0 +6: +#if MUTEX == 0 + DEC (@r8, r2) +#else + DEC (@(MUTEX,r8), r2) +#endif + tst r2, r2 + bf 3f +4: + lds.l @r15+, pr + mov.l @r15+, r8 + mov.l @r15+, r12 + rts + mov #0, r0 + +1: + mov r8, r5 +#if MUTEX != 0 + add #MUTEX, r5 +#endif + mov r2, r4 + mov.l .Lwait8, r1 + bsrf r1 + nop +.Lwait8b: + bra 2b + nop +3: + mov r8, r4 +#if MUTEX != 0 + add #MUTEX, r4 +#endif + mov.l .Lwake8, r1 + bsrf r1 + nop +.Lwake8b: + bra 4b + nop + +7: + mov.l r4, @-r15 + mov.l r6, @-r15 + mov r8, r4 +#if MUTEX != 0 + add #MUTEX, r4 +#endif + mov.l .Lwake9, r1 + bsrf r1 + nop +.Lwake9b: + + mov.l @r15+, r6 + bra 8b + mov.l @r15+, r4 + + .align 2 +.Lwait8: + .long __lll_mutex_lock_wait-.Lwait8b +.Lwake8: + .long __lll_mutex_unlock_wake-.Lwake8b +.Lwake9: + .long __lll_mutex_unlock_wake-.Lwake9b + .size __pthread_rwlock_unlock,.-__pthread_rwlock_unlock + + .globl pthread_rwlock_unlock +pthread_rwlock_unlock = __pthread_rwlock_unlock + + .globl __pthread_rwlock_unlock_internal +__pthread_rwlock_unlock_internal = __pthread_rwlock_unlock |