osfmk/ppc/setjmp.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * @OSF_COPYRIGHT@
  27  */
  28
  29 #ifndef _PPC_SETJMP_H_
  30 #define _PPC_SETJMP_H_
  31
  32 /*
  33  * We save the following registers (marked as non-volatile in the ELF spec)
  34  *
  35  * r1      - stack pointer
  36  * r13     - small data area pointer
  37  * r14-r30 - local variables
  38  * r31     - local variable/environment pointer
  39  *
  40  * cr      - condition register
  41  * lr      - link register (to know where to jump back to)
  42  * xer     - fixed point exception register
  43  *
  44  * fpscr   - floating point status and control
  45  * f14-f31 - local variables
  46  *
  47  * which comes to 57 words. We round up to 64 for good measure.
  48  */
  49
  50 typedef struct jmp_buf {
  51         int     jmp_buf[64];
  52 } jmp_buf_t;
  53
  54 #endif  /* _PPC_SETJMP_H_ */