osfmk/ppc/setjmp.h

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