diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelmutex.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelmutex.S | 176 |
1 files changed, 176 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelmutex.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelmutex.S new file mode 100644 index 0000000000..a48cd88fa8 --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelmutex.S @@ -0,0 +1,176 @@ +/* Copyright (C) 2002 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 + +#ifdef UP +# define LOCK +#else +# define LOCK lock +#endif + +#define SYS_gettimeofday __NR_gettimeofday +#define SYS_futex 240 +#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: + pushl %esi + pushl %ebx + pushl %edx + + movl %ecx, %ebx + xorl %esi, %esi /* No timeout. */ + xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */ +1: + leal 1(%eax), %edx /* account for the preceeded xadd. */ + movl $SYS_futex, %eax + int $0x80 + + movl $1, %eax + LOCK + xaddl %eax, (%ebx) + testl %eax, %eax + jne 1b + + movl $2, (%ebx) + + popl %edx + popl %ebx + popl %esi + ret + .size __lll_mutex_lock_wait,.-__lll_mutex_lock_wait + + + .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. */ + cmpl $1000000000, 4(%edx) + jae 3f + + pushl %edi + pushl %esi + pushl %ebx + pushl %ebp + + /* Stack frame for the timespec and timeval structs. */ + subl $8, %esp + + movl %ecx, %ebp + movl %edx, %edi + leal 1(%eax), %esi + + /* Get current time. */ +1: + movl %esp, %ebx + xorl %ecx, %ecx + movl $SYS_gettimeofday, %eax + int $0x80 + + /* Compute relative timeout. */ + movl 4(%esp), %eax + movl $1000, %edx + mul %edx /* Milli seconds to nano seconds. */ + movl (%edi), %ecx + movl 4(%edi), %edx + subl (%esp), %ecx + subl %eax, %edx + jns 4f + addl $1000000000, %edx + decl %ecx +4: testl %ecx, %ecx + js 5f /* Time is already up. */ + + /* Futex call. */ + movl %ecx, (%esp) /* Store relative timeout. */ + movl %edx, 4(%esp) + movl %esi, %edx + movl %esp, %esi + xorl %ecx, %ecx /* movl $FUTEX_WAIT, %ecx */ + movl %ebp, %ebx + movl $SYS_futex, %eax + int $0x80 + + movl $1, %esi + LOCK + xaddl %esi, (%ebx) + testl %esi, %esi + jne 7f + + movl $2, (%ebx) + xorl %eax, %eax + +6: addl $8, %esp + popl %ebp + popl %ebx + popl %esi + popl %edi + ret + + /* Check whether the time expired. */ +7: cmpl $-ETIMEDOUT, %eax + je 5f + jmp 1b + +3: movl $EINVAL, %eax + ret + +5: movl $ETIMEDOUT, %eax + jmp 6b + .size __lll_mutex_timedlock_wait,.-__lll_mutex_timedlock_wait + + + .globl __lll_mutex_unlock_wake + .type __lll_mutex_unlock_wake,@function + .hidden __lll_mutex_unlock_wake + .align 16 +__lll_mutex_unlock_wake: + pushl %esi + pushl %ebx + pushl %ecx + pushl %edx + + movl $FUTEX_WAKE, %ecx + movl %eax, %ebx + xorl %esi, %esi + movl $0, (%ebx) + movl $1, %edx /* Wake one thread. */ + movl $SYS_futex, %eax + int $0x80 + + popl %edx + popl %ecx + popl %ebx + popl %esi + ret + .size __lll_mutex_unlock_wake,.-__lll_mutex_unlock_wake |