nptl/sysdeps/unix/sysv/linux/i386/i486/sem_wait.S

   1 /* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2002.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <sysdep.h>
  21 #include <shlib-compat.h>
  22 #include <pthread-errnos.h>
  23
  24 #ifndef UP
  25 # define LOCK lock
  26 #else
  27 # define
  28 #endif
  29
  30 #define SYS_futex               240
  31 #define FUTEX_WAKE              1
  32
  33
  34         .text
  35
  36         .globl  __new_sem_wait
  37         .type   __new_sem_wait,@function
  38         .align  16
  39         cfi_startproc
  40 __new_sem_wait:
  41         /* First check for cancellation.  */
  42         movl    %gs:CANCELHANDLING, %eax
  43         andl    $0xfffffff9, %eax
  44         cmpl    $8, %eax
  45         je      5f
  46
  47         pushl   %ebx
  48         cfi_adjust_cfa_offset(4)
  49         pushl   %esi
  50         cfi_adjust_cfa_offset(4)
  51         subl    $4, %esp
  52         cfi_adjust_cfa_offset(4)
  53
  54         movl    16(%esp), %ebx
  55         cfi_offset(3, -8)               /* %ebx */
  56
  57         cfi_offset(6, -12)              /* %esi */
  58 3:      movl    (%ebx), %eax
  59 2:      testl   %eax, %eax
  60         je,pn   1f
  61
  62         leal    -1(%eax), %edx
  63         LOCK
  64         cmpxchgl %edx, (%ebx)
  65         jne,pn  2b
  66         xorl    %eax, %eax
  67
  68         movl    4(%esp), %esi
  69         cfi_restore(6)
  70         movl    8(%esp), %ebx
  71         cfi_restore(3)
  72         addl    $12, %esp
  73         cfi_adjust_cfa_offset(-12)
  74         ret
  75
  76         cfi_adjust_cfa_offset(8)
  77         cfi_offset(3, -8)               /* %ebx */
  78         cfi_offset(6, -12)              /* %esi */
  79 1:      call    __pthread_enable_asynccancel
  80         movl    %eax, (%esp)
  81
  82         xorl    %esi, %esi
  83         movl    $SYS_futex, %eax
  84         movl    %esi, %ecx
  85         movl    %esi, %edx
  86         ENTER_KERNEL
  87         movl    %eax, %esi
  88
  89         movl    (%esp), %eax
  90         call    __pthread_disable_asynccancel
  91
  92         testl   %esi, %esi
  93         je      3b
  94         cmpl    $-EWOULDBLOCK, %esi
  95         je      3b
  96         negl    %esi
  97 #ifdef PIC
  98         call    __i686.get_pc_thunk.bx
  99 #else
 100         movl    $4f, %ebx
 101 4:
 102 #endif
 103         addl    $_GLOBAL_OFFSET_TABLE_, %ebx
 104 #if USE___THREAD
 105         movl    %gs:0, %edx
 106         subl    errno@gottpoff(%ebx), %edx
 107         movl    %esi, (%edx)
 108 #else
 109         call    __errno_location@plt
 110         movl    %esi, (%eax)
 111 #endif
 112         orl     $-1, %eax
 113         movl    4(%esp), %esi
 114         cfi_restore(6)
 115         movl    8(%esp), %ebx
 116         cfi_restore(3)
 117         addl    $12, %esp
 118         cfi_adjust_cfa_offset(-12)
 119         ret
 120
 121 5:      /* Canceled.  */
 122         movl    $0xffffffff, %gs:RESULT
 123         LOCK
 124         orl     $0x10, %gs:CANCELHANDLING
 125         movl    %gs:CLEANUP_JMP_BUF, %eax
 126         jmp     HIDDEN_JUMPTARGET (__pthread_unwind)
 127         cfi_endproc
 128         .size   __new_sem_wait,.-__new_sem_wait
 129         versioned_symbol(libpthread, __new_sem_wait, sem_wait, GLIBC_2_1)
 130 #if SHLIB_COMPAT(libpthread, GLIBC_2_0, GLIBC_2_1)
 131         .global __old_sem_wait
 132 __old_sem_wait = __new_sem_wait
 133         compat_symbol(libpthread, __old_sem_wait, sem_wait, GLIBC_2_0)
 134 #endif