sysdeps/unix/sysv/linux/x86_64/x32/sched_getcpu.S

   1 /* Copyright (C) 2012-2015 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifdef SHARED
  19 #include <sysdep.h>
  20 #include <tls.h>
  21 #define _ERRNO_H        1
  22 #include <bits/errno.h>
  23
  24 ENTRY (sched_getcpu)
  25         /* Align stack and create local variable for result.  */
  26         sub     $0x8, %esp
  27         cfi_adjust_cfa_offset(8)
  28
  29         mov     %esp, %edi
  30         xor     %esi, %esi
  31         mov     $VGETCPU_CACHE_OFFSET, %edx
  32         add     %fs:0, %edx
  33
  34         call    __getcpu
  35
  36         /* Local variable is result if the call is successful.  */
  37         mov     (%rsp), %edx
  38         /* Restore stack pointer before we might jump to
  39            SYSCALL_ERROR_LABEL which returns to the caller.  */
  40         add     $0x8, %esp
  41         cfi_adjust_cfa_offset(-8)
  42
  43         cmp     $-4095, %eax
  44         jae     SYSCALL_ERROR_LABEL
  45
  46         mov     %edx, %eax
  47         ret
  48 PSEUDO_END(sched_getcpu)
  49 #endif