diff options
Diffstat (limited to 'nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelsem.S')
| -rw-r--r-- | nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelsem.S | 311 |
1 files changed, 311 insertions, 0 deletions
diff --git a/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelsem.S b/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelsem.S new file mode 100644 index 0000000000..18fb16f6f6 --- /dev/null +++ b/nptl/sysdeps/unix/sysv/linux/i386/i486/lowlevelsem.S @@ -0,0 +1,311 @@ +/* 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> +#include <shlib-compat.h> + + .text + +#ifndef UP +# define LOCK lock +#else +# define +#endif + +#define SYS_gettimeofday __NR_gettimeofday +#define SYS_futex 240 +#define FUTEX_WAKE 1 + +#define EINTR 4 +#define EAGAIN 11 +#define EWOULDBLOCK EAGAIN +#define EINVAL 22 +#define ETIMEDOUT 110 + + + .globl __new_sem_wait + .type __new_sem_wait,@function + .align 16 +__new_sem_wait: + pushl %ebx + pushl %esi + + movl 12(%esp), %ebx + +3: movl (%ebx), %eax +2: testl %eax, %eax + je,pn 1f + + leal -1(%eax), %edx + LOCK + cmpxchgl %edx, (%ebx) + jne,pn 2b + xorl %eax, %eax + + popl %esi + popl %ebx + ret + +1: xorl %esi, %esi + movl $SYS_futex, %eax + movl %esi, %ecx + movl %esi, %edx + int $0x80 + + testl %eax, %eax + je 3b + cmpl $-EWOULDBLOCK, %eax + je 3b + negl %eax +#ifdef PIC + call __i686.get_pc_thunk.bx +#else + movl $4f, %ebx +4: +#endif + addl $_GLOBAL_OFFSET_TABLE_, %ebx + movl %gs:0, %edx + subl errno@gottpoff(%ebx), %edx + movl %eax, (%edx) + orl $-1, %eax + popl %esi + popl %ebx + ret + .size __new_sem_wait,.-__new_sem_wait + .symver __new_sem_wait, sem_wait@@GLIBC_2.1 +#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) + .global __old_sem_wait +__old_sem_wait = __new_sem_wait + .symver __old_sem_wait, sem_wait@GLIBC_2.0 +#endif + + + .globl __new_sem_trywait + .type __new_sem_trywait,@function + .align 16 +__new_sem_trywait: + movl 4(%esp), %ecx + + movl (%ecx), %eax +2: testl %eax, %eax + jz 1f + + leal -1(%eax), %edx + LOCK + cmpxchgl %edx, (%ecx) + jne,pn 2b + xorl %eax, %eax + ret + +1: +#ifdef PIC + call __i686.get_pc_thunk.cx +#else + movl $3f, %ecx +3: +#endif + addl $_GLOBAL_OFFSET_TABLE_, %ecx + movl %gs:0, %edx + subl errno@gottpoff(%ecx), %edx + movl $EAGAIN, (%edx) + orl $-1, %eax + ret + .size __new_sem_trywait,.-__new_sem_trywait + .symver __new_sem_trywait, sem_trywait@@GLIBC_2.1 +#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) + .global __old_sem_trywait +__old_sem_trywait = __new_sem_trywait + .symver __old_sem_trywait, sem_trywait@GLIBC_2.0 +#endif + + + .globl sem_timedwait + .type sem_timedwait,@function + .align 16 +sem_timedwait: + movl 4(%esp), %ecx + + movl (%ecx), %eax +2: testl %eax, %eax + je,pn 1f + + leal -1(%eax), %edx + LOCK + cmpxchgl %edx, (%ecx) + jne,pn 2b + + xorl %eax, %eax + ret + + /* Check whether the timeout value is valid. */ +1: pushl %esi + pushl %edi + pushl %ebx + subl $8, %esp + + movl %esp, %esi + movl 28(%esp), %edi + + /* Check for invalid nanosecond field. */ + cmpl $1000000000, 4(%edi) + movl $EINVAL, %eax + jae 6f + +7: xorl %ecx, %ecx + movl %esp, %ebx + movl %ecx, %edx + 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 5f + addl $1000000000, %edx + decl %ecx +5: testl %ecx, %ecx + movl $ETIMEDOUT, %eax + js 6f /* Time is already up. */ + + movl %ecx, (%esp) /* Store relative timeout. */ + movl %edx, 4(%esp) + movl 24(%esp), %ebx + xorl %ecx, %ecx + movl $SYS_futex, %eax + xorl %edx, %edx + int $0x80 + + testl %eax, %eax + je,pt 9f + cmpl $-EWOULDBLOCK, %eax + jne 3f + +9: movl (%ebx), %eax +8: testl %eax, %eax + je 7b + + leal -1(%eax), %ecx + LOCK + cmpxchgl %ecx, (%ebx) + jne,pn 8b + + addl $8, %esp + xorl %eax, %eax + popl %ebx + popl %edi + popl %esi + ret + +3: negl %eax +6: +#ifdef PIC + call __i686.get_pc_thunk.bx +#else + movl $4f, %ebx +4: +#endif + addl $_GLOBAL_OFFSET_TABLE_, %ebx + movl %gs:0, %edx + subl errno@gottpoff(%ebx), %edx + movl %eax, (%edx) + + addl $8, %esp + orl $-1, %eax + popl %ebx + popl %edi + popl %esi + ret + .size sem_timedwait,.-sem_timedwait + + + .globl __new_sem_post + .type __new_sem_post,@function + .align 16 +__new_sem_post: + pushl %esi + pushl %ebx + + movl 12(%esp), %ebx + movl $1, %edx + LOCK + xaddl %edx, (%ebx) + + xorl %esi, %esi + movl $SYS_futex, %eax + movl $FUTEX_WAKE, %ecx + incl %edx + int $0x80 + + testl %eax, %eax + js 1f + + popl %ebx + popl %esi + ret + +1: +#ifdef PIC + call __i686.get_pc_thunk.bx +#else + movl $4f, %ebx +4: +#endif + addl $_GLOBAL_OFFSET_TABLE_, %ebx + movl %gs:0, %edx + subl errno@gottpoff(%ebx), %edx + movl $EINVAL, (%edx) + + orl $-1, %eax + popl %ebx + popl %esi + ret + .size __new_sem_post,.-__new_sem_post + .symver __new_sem_post, sem_post@@GLIBC_2.1 +#if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1) + .global __old_sem_post +__old_sem_post = __new_sem_post + .symver __old_sem_post, sem_post@GLIBC_2.0 +#endif + + +#ifdef PIC + .section .gnu.linkonce.t.__i686.get_pc_thunk.bx,"ax",@progbits + .globl __i686.get_pc_thunk.bx + .hidden __i686.get_pc_thunk.bx + .type __i686.get_pc_thunk.bx,@function +__i686.get_pc_thunk.bx: + movl (%esp), %ebx; + ret + .size __i686.get_pc_thunk.bx,.-__i686.get_pc_thunk.bx + + + .section .gnu.linkonce.t.__i686.get_pc_thunk.cx,"ax",@progbits + .globl __i686.get_pc_thunk.cx + .hidden __i686.get_pc_thunk.cx + .type __i686.get_pc_thunk.cx,@function +__i686.get_pc_thunk.cx: + movl (%esp), %ecx; + ret + .size __i686.get_pc_thunk.cx,.-__i686.get_pc_thunk.cx +#endif |