osfmk/ppc/setjmp.h

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_COPYRIGHT@
  32  */
  33
  34 #ifndef _PPC_SETJMP_H_
  35 #define _PPC_SETJMP_H_
  36
  37 /*
  38  * We save the following registers (marked as non-volatile in the ELF spec)
  39  *
  40  * r1      - stack pointer
  41  * r13     - small data area pointer
  42  * r14-r30 - local variables
  43  * r31     - local variable/environment pointer
  44  *
  45  * cr      - condition register
  46  * lr      - link register (to know where to jump back to)
  47  * xer     - fixed point exception register
  48  *
  49  * fpscr   - floating point status and control
  50  * f14-f31 - local variables
  51  *
  52  * which comes to 57 words. We round up to 64 for good measure.
  53  */
  54
  55 typedef struct jmp_buf {
  56         int     jmp_buf[64];
  57 } jmp_buf_t;
  58
  59 #endif  /* _PPC_SETJMP_H_ */