nptl/sysdeps/unix/sysv/linux/x86_64/sem_timedwait.S

   1 /* Copyright (C) 2002, 2003, 2005, 2007 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               202
  31
  32 /* For the calculation see asm/vsyscall.h.  */
  33 #define VSYSCALL_ADDR_vgettimeofday     0xffffffffff600000
  34
  35
  36         .text
  37
  38         .globl  sem_timedwait
  39         .type   sem_timedwait,@function
  40         .align  16
  41         cfi_startproc
  42 sem_timedwait:
  43         /* First check for cancellation.  */
  44         movl    %fs:CANCELHANDLING, %eax
  45         andl    $0xfffffff9, %eax
  46         cmpl    $8, %eax
  47         je      11f
  48
  49         movl    (%rdi), %eax
  50 2:      testl   %eax, %eax
  51         je      1f
  52
  53         leaq    -1(%rax), %rdx
  54         LOCK
  55         cmpxchgl %edx, (%rdi)
  56         jne     2b
  57
  58         xorl    %eax, %eax
  59         retq
  60
  61         /* Check whether the timeout value is valid.  */
  62 1:      pushq   %r12
  63         cfi_adjust_cfa_offset(8)
  64         pushq   %r13
  65         cfi_adjust_cfa_offset(8)
  66         pushq   %r14
  67         cfi_adjust_cfa_offset(8)
  68         subq    $24, %rsp
  69         cfi_adjust_cfa_offset(24)
  70
  71         movq    %rdi, %r12
  72         cfi_offset(12, -16)             /* %r12 */
  73         movq    %rsi, %r13
  74         cfi_offset(13, -24)             /* %r13 */
  75
  76         /* Check for invalid nanosecond field.  */
  77         cmpq    $1000000000, 8(%r13)
  78         movl    $EINVAL, %r14d
  79         cfi_offset(14, -24)             /* %r14 */
  80         jae     6f
  81
  82 7:      xorl    %esi, %esi
  83         movq    %rsp, %rdi
  84         movq    $VSYSCALL_ADDR_vgettimeofday, %rax
  85         callq   *%rax
  86
  87         /* Compute relative timeout.  */
  88         movq    8(%rsp), %rax
  89         movl    $1000, %edi
  90         mul     %rdi            /* Milli seconds to nano seconds.  */
  91         movq    (%r13), %rdi
  92         movq    8(%r13), %rsi
  93         subq    (%rsp), %rdi
  94         subq    %rax, %rsi
  95         jns     5f
  96         addq    $1000000000, %rsi
  97         decq    %rdi
  98 5:      testq   %rdi, %rdi
  99         movl    $ETIMEDOUT, %r14d
 100         js      6f              /* Time is already up.  */
 101
 102         movq    %rdi, (%rsp)    /* Store relative timeout.  */
 103         movq    %rsi, 8(%rsp)
 104
 105         call    __pthread_enable_asynccancel
 106         movl    %eax, 16(%rsp)
 107
 108         movq    %rsp, %r10
 109         movq    %r12, %rdi
 110         xorl    %esi, %esi
 111         movl    $SYS_futex, %eax
 112         xorl    %edx, %edx
 113         syscall
 114         movq    %rax, %r14
 115
 116         movl    16(%rsp), %edi
 117         call    __pthread_disable_asynccancel
 118
 119         testq   %r14, %r14
 120         je      9f
 121         cmpq    $-EWOULDBLOCK, %r14
 122         jne     3f
 123
 124 9:      movl    (%r12), %eax
 125 8:      testl   %eax, %eax
 126         je      7b
 127
 128         leaq    -1(%rax), %rcx
 129         LOCK
 130         cmpxchgl %ecx, (%r12)
 131         jne     8b
 132
 133         xorl    %eax, %eax
 134 10:     addq    $24, %rsp
 135         cfi_adjust_cfa_offset(-24)
 136         popq    %r14
 137         cfi_adjust_cfa_offset(-8)
 138         cfi_restore(14)
 139         popq    %r13
 140         cfi_adjust_cfa_offset(-8)
 141         cfi_restore(13)
 142         popq    %r12
 143         cfi_adjust_cfa_offset(-8)
 144         cfi_restore(12)
 145         retq
 146
 147         cfi_adjust_cfa_offset(48)
 148         cfi_offset(12, -16)             /* %r12 */
 149         cfi_offset(13, -24)             /* %r13 */
 150         cfi_offset(14, -32)             /* %r14 */
 151 3:      negq    %r14
 152 6:
 153 #if USE___THREAD
 154         movq    errno@gottpoff(%rip), %rdx
 155         movl    %r14d, %fs:(%rdx)
 156 #else
 157         callq   __errno_location@plt
 158         movl    %r14d, (%rax)
 159 #endif
 160
 161         orl     $-1, %eax
 162         jmp     10b
 163         cfi_adjust_cfa_offset(-48)
 164         cfi_restore(14)
 165         cfi_restore(13)
 166         cfi_restore(12)
 167
 168 11:     /* Canceled.  */
 169         movq    $0xffffffffffffffff, %fs:RESULT
 170         LOCK
 171         orl     $0x10, %fs:CANCELHANDLING
 172         movq    %fs:CLEANUP_JMP_BUF, %rdi
 173         jmp     HIDDEN_JUMPTARGET (__pthread_unwind)
 174         cfi_endproc
 175         .size   sem_timedwait,.-sem_timedwait