diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/x86_64/lowlevelmutex.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/x86_64/lowlevelmutex.S | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevelmutex.S b/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevelmutex.S new file mode 100644 index 0000000000..a494e0efaa --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/x86_64/lowlevelmutex.S @@ -0,0 +1,164 @@ +/* Copyright (C) 2002, 2003 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include <sysdep.h> + + .text + +#ifndef LOCK +# ifdef UP +# define LOCK +# else +# define LOCK lock +# endif +#endif + +#define SYS_gettimeofday __NR_gettimeofday +#define SYS_futex 202 +#define FUTEX_WAIT 0 +#define FUTEX_WAKE 1 + +#define EWOULDBLOCK 11 +#define EINVAL 22 +#define ETIMEDOUT 110 + + + .globl __lll_mutex_lock_wait + .type __lll_mutex_lock_wait,@function + .hidden __lll_mutex_lock_wait + .align 16 +__lll_mutex_lock_wait: + pushq %r10 + pushq %rdx + + xorq %r10, %r10 /* No timeout. */ + +1: + leal 1(%esi), %edx /* account for the preceeded xadd. */ + movq %r10, %rsi /* movl $FUTEX_WAIT, %ecx */ + movq $SYS_futex, %rax + syscall + + movl $1, %esi + LOCK + xaddl %esi, (%rdi) + testl %esi, %esi + jne 1b + + movl $2, (%rdi) + + popq %rdx + popq %r10 + retq + .size __lll_mutex_lock_wait,.-__lll_mutex_lock_wait + + +#ifdef NOT_IN_libc + .globl __lll_mutex_timedlock_wait + .type __lll_mutex_timedlock_wait,@function + .hidden __lll_mutex_timedlock_wait + .align 16 +__lll_mutex_timedlock_wait: + /* Check for a valid timeout value. */ + cmpq $1000000000, 4(%rdx) + jae 3f + + /* Stack frame for the timespec and timeval structs. */ + subq $16, %rsp + + movq %rdi, %r8 + movq %rdx, %r9 + leal 1(%eax), %edx + + /* Get current time. */ +1: + movq %rsp, %rdi + xorq %rsi, %rsi + movq $SYS_gettimeofday, %rax + syscall + + /* Compute relative timeout. */ + movq 8(%esp), %rax + movq $1000, %rdi + mul %rdi /* Milli seconds to nano seconds. */ + movq (%r9), %rdi + movq 8(%r9), %rsi + subq (%rsp), %rdi + subq %rax, %rsi + jns 4f + addq $1000000000, %rsi + decq %rdi +4: testq %rdi, %rdi + js 5f /* Time is already up. */ + + /* Futex call. */ + movq %rdi, (%rsp) /* Store relative timeout. */ + movq %rsi, 4(%rsp) + + movq %rsp, %r10 + xorq %rsi, %rsi /* movq $FUTEX_WAIT, %rsi */ + movq %r8, %rdi + movq $SYS_futex, %rax + syscall + + movl $1, %edx + LOCK + xaddl %edx, (%rdi) + testl %edx, %edx + jne 7f + + movl $2, (%rdi) + xorl %eax, %eax + + addq $16, %rsp + retq + + /* Check whether the time expired. */ +7: cmpq $-ETIMEDOUT, %rax + je 5f + jmp 1b + +3: movl $EINVAL, %eax + retq + +5: movl $ETIMEDOUT, %eax + addq $16, %rsp + retq + .size __lll_mutex_timedlock_wait,.-__lll_mutex_timedlock_wait +#endif + + + .globl __lll_mutex_unlock_wake + .type __lll_mutex_unlock_wake,@function + .hidden __lll_mutex_unlock_wake + .align 16 +__lll_mutex_unlock_wake: + pushq %rsi + pushq %rdx + + movl $0, (%rdi) + movq $FUTEX_WAKE, %rsi + movl $1, %edx /* Wake one thread. */ + movq $SYS_futex, %rax + syscall + + popq %rdx + popq %rsi + retq + .size __lll_mutex_unlock_wake,.-__lll_mutex_unlock_wake |