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Annotation of XNU/osfmk/ppc/setjmp.h, revision 1.1.1.1

1.1       root        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_ */

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