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Annotation of XNU/EXTERNAL_HEADERS/architecture/i386/frame.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:  * Copyright (c) 1992 NeXT Computer, Inc.
        !            24:  *
        !            25:  * Intel386 Family:    Processor exception frame.
        !            26:  *
        !            27:  * HISTORY
        !            28:  *
        !            29:  * 31 August 1992 ? at NeXT
        !            30:  *     Added v86 mode stuff.
        !            31:  *
        !            32:  * 8 June 1992 ? at NeXT
        !            33:  *     Changed name of write field in err_code_t
        !            34:  *     which collided with write() in shlib.
        !            35:  *
        !            36:  * 30 March 1992 ? at NeXT
        !            37:  *     Created.
        !            38:  */
        !            39: 
        !            40: /*
        !            41:  * Format of the error code
        !            42:  * generated by the hardware
        !            43:  * for certain exceptions.
        !            44:  */
        !            45:  
        !            46: typedef union err_code {
        !            47:     struct err_code_normal {
        !            48:        unsigned int    ext     :1,
        !            49:                        tbl     :2,
        !            50: #define ERR_GDT                0
        !            51: #define ERR_IDT                1
        !            52: #define ERR_LDT                2
        !            53:                        index   :13,
        !            54:                                :16;
        !            55:     } normal;
        !            56:     struct err_code_pgfault {
        !            57:        unsigned int    prot    :1,
        !            58:                        wrtflt  :1,
        !            59:                        user    :1,
        !            60:                                :29;
        !            61:     } pgfault;
        !            62: } err_code_t;
        !            63: 
        !            64: #import <architecture/i386/sel.h>
        !            65: 
        !            66: /*
        !            67:  * The actual hardware exception frame
        !            68:  * is variable in size.  An error code is
        !            69:  * only pushed for certain exceptions.
        !            70:  * Previous stack information is only
        !            71:  * pushed for exceptions that cause a
        !            72:  * change in privilege level.  The dpl
        !            73:  * field of the saved CS selector can be
        !            74:  * used to determine whether this is the
        !            75:  * case.  If the interrupted task was
        !            76:  * executing in v86 mode, then the data
        !            77:  * segment registers are also present in
        !            78:  * the exception frame (in addition to
        !            79:  * previous stack information).  This
        !            80:  * case can be determined by examining
        !            81:  * eflags.
        !            82:  */
        !            83: 
        !            84: typedef struct except_frame {
        !            85:     err_code_t         err;
        !            86:     unsigned int       eip;
        !            87:     sel_t              cs;
        !            88:     unsigned int               :0;
        !            89:     unsigned int       eflags;
        !            90:     unsigned int       esp;
        !            91:     sel_t              ss;
        !            92:     unsigned int               :0;
        !            93:     unsigned short     v_es;
        !            94:     unsigned int               :0;
        !            95:     unsigned short     v_ds;
        !            96:     unsigned int               :0;
        !            97:     unsigned short     v_fs;
        !            98:     unsigned int               :0;
        !            99:     unsigned short     v_gs;
        !           100:     unsigned int               :0;
        !           101: } except_frame_t;
        !           102: 
        !           103: /*
        !           104:  * Values in eflags.
        !           105:  */
        !           106: 
        !           107: #ifndef        EFL_CF  /* FIXME */
        !           108: #define EFL_CF         0x00001
        !           109: #define EFL_PF         0x00004
        !           110: #define EFL_AF         0x00010
        !           111: #define EFL_ZF         0x00040
        !           112: #define EFL_SF         0x00080
        !           113: #define EFL_TF         0x00100
        !           114: #define EFL_IF         0x00200
        !           115: #define EFL_DF         0x00400
        !           116: #define EFL_OF         0x00800
        !           117: #define EFL_IOPL       0x03000
        !           118: #define EFL_NT         0x04000
        !           119: #define EFL_RF         0x10000
        !           120: #define EFL_VM         0x20000
        !           121: #define EFL_AC         0x40000
        !           122: #endif
        !           123: 
        !           124: #define EFL_CLR                0xfff88028
        !           125: #define EFL_SET                0x00000002

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