i386/gen/_setcontext.S

   1 /*
   2  * Copyright (c) 2007 Apple Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23
  24 #if defined(__i386__)
  25
  26 #include <architecture/i386/asm_help.h>
  27
  28 TEXT
  29 LABEL(__setcontext)
  30         subl  $28, %esp
  31         movl  32(%esp), %eax
  32         movl  4(%eax), %eax
  33         movl  %eax, (%esp)              /* load up signal mask */
  34         CALL_EXTERN(_sigsetmask)        /* set signal mask */
  35         addl  $28, %esp
  36         movl  4(%esp), %ecx
  37         movl  28(%ecx), %ecx
  38         movl  16(%ecx), %ebx
  39         movl  28(%ecx), %edi
  40         movl  32(%ecx), %esi
  41         movl  36(%ecx), %ebp
  42         movl  40(%ecx), %esp
  43         pushl 48(%ecx)
  44         popfl
  45         movl  12(%ecx), %eax
  46         jmp   *52(%ecx)
  47
  48 #endif /* __i386__ */