diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedrdlock.S')
| -rw-r--r-- | sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedrdlock.S | 274 |
1 files changed, 274 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedrdlock.S b/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedrdlock.S new file mode 100644 index 0000000000..40bcc04a9d --- /dev/null +++ b/sysdeps/unix/sysv/linux/x86_64/pthread_rwlock_timedrdlock.S @@ -0,0 +1,274 @@ +/* Copyright (C) 2002-2014 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@redhat.com>, 2002. + + 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, see + <http://www.gnu.org/licenses/>. */ + +#include <sysdep.h> +#include <lowlevellock.h> +#include <lowlevelrwlock.h> +#include <pthread-errnos.h> +#include <kernel-features.h> + + .text + + .globl pthread_rwlock_timedrdlock + .type pthread_rwlock_timedrdlock,@function + .align 16 +pthread_rwlock_timedrdlock: + cfi_startproc + pushq %r12 + cfi_adjust_cfa_offset(8) + cfi_rel_offset(%r12, 0) + pushq %r13 + cfi_adjust_cfa_offset(8) + cfi_rel_offset(%r13, 0) +#ifdef __ASSUME_FUTEX_CLOCK_REALTIME +# define VALREG %edx +#else + pushq %r14 + cfi_adjust_cfa_offset(8) + cfi_rel_offset(%r14, 0) + + subq $16, %rsp + cfi_adjust_cfa_offset(16) +# define VALREG %r14d +#endif + + movq %rdi, %r12 + movq %rsi, %r13 + + /* Get the lock. */ + movl $1, %esi + xorl %eax, %eax + LOCK +#if MUTEX == 0 + cmpxchgl %esi, (%rdi) +#else + cmpxchgl %esi, MUTEX(%rdi) +#endif + jnz 1f + +2: movl WRITER(%r12), %eax + testl %eax, %eax + jne 14f + cmpl $0, WRITERS_QUEUED(%r12) + je 5f + cmpl $0, FLAGS(%r12) + je 5f + + /* Check the value of the timeout parameter. */ +3: cmpq $1000000000, 8(%r13) + jae 19f + + incl READERS_QUEUED(%r12) + je 4f + + movl READERS_WAKEUP(%r12), VALREG + + /* Unlock. */ + LOCK +#if MUTEX == 0 + decl (%r12) +#else + decl MUTEX(%r12) +#endif + jne 10f + +11: +#ifndef __ASSUME_FUTEX_CLOCK_REALTIME +# ifdef PIC + cmpl $0, __have_futex_clock_realtime(%rip) +# else + cmpl $0, __have_futex_clock_realtime +# endif + je .Lreltmo +#endif + + cmpq $0, (%r13) + js 16f /* Time is already up. */ + + movl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT_BITSET|FUTEX_CLOCK_REALTIME, %esi + xorl PSHARED(%r12), %esi + movq %r13, %r10 + movl $0xffffffff, %r9d +#ifndef __ASSUME_FUTEX_CLOCK_REALTIME + movl %r14d, %edx +#endif +21: leaq READERS_WAKEUP(%r12), %rdi + movl $SYS_futex, %eax + syscall + movq %rax, %rdx + +#ifndef __ASSUME_FUTEX_CLOCK_REALTIME + .subsection 2 +.Lreltmo: + /* Get current time. */ + movq %rsp, %rdi + xorl %esi, %esi + /* This call works because we directly jump to a system call entry + which preserves all the registers. */ + call JUMPTARGET(__gettimeofday) + + /* Compute relative timeout. */ + movq 8(%rsp), %rax + movl $1000, %edi + mul %rdi /* Milli seconds to nano seconds. */ + movq (%r13), %rcx + movq 8(%r13), %rdi + subq (%rsp), %rcx + subq %rax, %rdi + jns 15f + addq $1000000000, %rdi + decq %rcx +15: testq %rcx, %rcx + js 16f /* Time is already up. */ + + /* Futex call. */ + movq %rcx, (%rsp) /* Store relative timeout. */ + movq %rdi, 8(%rsp) + +# ifdef __ASSUME_PRIVATE_FUTEX + movl $FUTEX_PRIVATE_FLAG|FUTEX_WAIT, %esi + xorl PSHARED(%r12), %esi +# else +# if FUTEX_WAIT == 0 + movl PSHARED(%r12), %esi +# else + movl $FUTEX_WAIT, %esi + orl PSHARED(%r12), %esi +# endif + xorl %fs:PRIVATE_FUTEX, %esi +# endif + movq %rsp, %r10 + movl %r14d, %edx + + jmp 21b + .previous +#endif + +17: /* Reget the lock. */ + movl $1, %esi + xorl %eax, %eax + LOCK +#if MUTEX == 0 + cmpxchgl %esi, (%r12) +#else + cmpxchgl %esi, MUTEX(%r12) +#endif + jnz 12f + +13: decl READERS_QUEUED(%r12) + cmpq $-ETIMEDOUT, %rdx + jne 2b + +18: movl $ETIMEDOUT, %edx + jmp 9f + + +5: xorl %edx, %edx + incl NR_READERS(%r12) + je 8f +9: LOCK +#if MUTEX == 0 + decl (%r12) +#else + decl MUTEX(%r12) +#endif + jne 6f + +7: movq %rdx, %rax + +#ifndef __ASSUME_FUTEX_CLOCK_REALTIME + addq $16, %rsp + cfi_adjust_cfa_offset(-16) + popq %r14 + cfi_adjust_cfa_offset(-8) + cfi_restore(%r14) +#endif + popq %r13 + cfi_adjust_cfa_offset(-8) + cfi_restore(%r13) + popq %r12 + cfi_adjust_cfa_offset(-8) + cfi_restore(%r12) + retq + +#ifdef __ASSUME_PRIVATE_FUTEX + cfi_adjust_cfa_offset(16) + cfi_rel_offset(%r12, 8) + cfi_rel_offset(%r13, 0) +#else + cfi_adjust_cfa_offset(40) + cfi_offset(%r12, -16) + cfi_offset(%r13, -24) + cfi_offset(%r14, -32) +#endif +1: movl PSHARED(%rdi), %esi +#if MUTEX != 0 + addq $MUTEX, %rdi +#endif + callq __lll_lock_wait + jmp 2b + +14: cmpl %fs:TID, %eax + jne 3b + movl $EDEADLK, %edx + jmp 9b + +6: movl PSHARED(%r12), %esi +#if MUTEX == 0 + movq %r12, %rdi +#else + leal MUTEX(%r12), %rdi +#endif + callq __lll_unlock_wake + jmp 7b + + /* Overflow. */ +8: decl NR_READERS(%r12) + movl $EAGAIN, %edx + jmp 9b + + /* Overflow. */ +4: decl READERS_QUEUED(%r12) + movl $EAGAIN, %edx + jmp 9b + +10: movl PSHARED(%r12), %esi +#if MUTEX == 0 + movq %r12, %rdi +#else + leaq MUTEX(%r12), %rdi +#endif + callq __lll_unlock_wake + jmp 11b + +12: movl PSHARED(%r12), %esi +#if MUTEX == 0 + movq %r12, %rdi +#else + leaq MUTEX(%r12), %rdi +#endif + callq __lll_lock_wait + jmp 13b + +16: movq $-ETIMEDOUT, %rdx + jmp 17b + +19: movl $EINVAL, %edx + jmp 9b + cfi_endproc + .size pthread_rwlock_timedrdlock,.-pthread_rwlock_timedrdlock |