i386/libsa/setjmp.s

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24
  25 #include <architecture/i386/asm_help.h>
  26
  27 #define O_EDI   0
  28 #define O_ESI   4
  29 #define O_EBX   8
  30 #define O_EBP   12
  31 #define O_ESP   16
  32 #define O_EIP   20
  33
  34 LEAF(_setjmp, 0)
  35 X_LEAF(_set_label, _setjmp)
  36         movl    4(%esp), %edx       // address of save area
  37         movl    %edi, O_EDI(%edx)
  38         movl    %esi, O_ESI(%edx)
  39         movl    %ebx, O_EBX(%edx)
  40         movl    %ebp, O_EBP(%edx)
  41         movl    %esp, O_ESP(%edx)
  42         movl    (%esp), %ecx        // %eip (return address)
  43         movl    %ecx, O_EIP(%edx)
  44         subl    %eax, %eax          // retval <- 0
  45         ret
  46
  47 LEAF(_longjmp, 0)
  48 X_LEAF(_jump_label, _longjmp)
  49         movl    4(%esp), %edx       // address of save area
  50         movl    O_EDI(%edx), %edi
  51         movl    O_ESI(%edx), %esi
  52         movl    O_EBX(%edx), %ebx
  53         movl    O_EBP(%edx), %ebp
  54         movl    O_ESP(%edx), %esp
  55         movl    O_EIP(%edx), %eax   // %eip (return address)
  56         movl    %eax, 0(%esp)
  57         popl    %eax                // ret addr != 0
  58         jmp         *%eax               // indirect