osfmk/ppc/setjmp.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25
  26 #ifndef _PPC_SETJMP_H_
  27 #define _PPC_SETJMP_H_
  28
  29 /*
  30  * We save the following registers (marked as non-volatile in the ELF spec)
  31  *
  32  * r1      - stack pointer
  33  * r13     - small data area pointer
  34  * r14-r30 - local variables
  35  * r31     - local variable/environment pointer
  36  *
  37  * cr      - condition register
  38  * lr      - link register (to know where to jump back to)
  39  * xer     - fixed point exception register
  40  *
  41  * fpscr   - floating point status and control
  42  * f14-f31 - local variables
  43  *
  44  * which comes to 57 words. We round up to 64 for good measure.
  45  */
  46
  47 typedef struct jmp_buf {
  48         int     jmp_buf[64];
  49 } jmp_buf_t;
  50
  51 #endif  /* _PPC_SETJMP_H_ */