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