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Annotation of GNUtools/cctools/include/architecture/i386/frame.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1992 NeXT Computer, Inc.
        !             3:  *
        !             4:  * Intel386 Family:    Processor exception frame.
        !             5:  *
        !             6:  * HISTORY
        !             7:  *
        !             8:  * 31 August 1992 David E. Bohman at NeXT
        !             9:  *     Added v86 mode stuff.
        !            10:  *
        !            11:  * 8 June 1992 David E. Bohman at NeXT
        !            12:  *     Changed name of write field in err_code_t
        !            13:  *     which collided with write() in shlib.
        !            14:  *
        !            15:  * 30 March 1992 David E. Bohman at NeXT
        !            16:  *     Created.
        !            17:  */
        !            18: 
        !            19: /*
        !            20:  * Format of the error code
        !            21:  * generated by the hardware
        !            22:  * for certain exceptions.
        !            23:  */
        !            24:  
        !            25: typedef union err_code {
        !            26:     struct err_code_normal {
        !            27:        unsigned int    ext     :1,
        !            28:                        tbl     :2,
        !            29: #define ERR_GDT                0
        !            30: #define ERR_IDT                1
        !            31: #define ERR_LDT                2
        !            32:                        index   :13,
        !            33:                                :16;
        !            34:     } normal;
        !            35:     struct err_code_pgfault {
        !            36:        unsigned int    prot    :1,
        !            37:                        wrtflt  :1,
        !            38:                        user    :1,
        !            39:                                :29;
        !            40:     } pgfault;
        !            41: } err_code_t;
        !            42: 
        !            43: #import <architecture/i386/sel.h>
        !            44: 
        !            45: /*
        !            46:  * The actual hardware exception frame
        !            47:  * is variable in size.  An error code is
        !            48:  * only pushed for certain exceptions.
        !            49:  * Previous stack information is only
        !            50:  * pushed for exceptions that cause a
        !            51:  * change in privilege level.  The dpl
        !            52:  * field of the saved CS selector can be
        !            53:  * used to determine whether this is the
        !            54:  * case.  If the interrupted task was
        !            55:  * executing in v86 mode, then the data
        !            56:  * segment registers are also present in
        !            57:  * the exception frame (in addition to
        !            58:  * previous stack information).  This
        !            59:  * case can be determined by examining
        !            60:  * eflags.
        !            61:  */
        !            62: 
        !            63: typedef struct except_frame {
        !            64:     err_code_t         err;
        !            65:     unsigned int       eip;
        !            66:     sel_t              cs;
        !            67:     unsigned int               :0;
        !            68:     unsigned int       eflags;
        !            69:     unsigned int       esp;
        !            70:     sel_t              ss;
        !            71:     unsigned int               :0;
        !            72:     unsigned short     v_es;
        !            73:     unsigned int               :0;
        !            74:     unsigned short     v_ds;
        !            75:     unsigned int               :0;
        !            76:     unsigned short     v_fs;
        !            77:     unsigned int               :0;
        !            78:     unsigned short     v_gs;
        !            79:     unsigned int               :0;
        !            80: } except_frame_t;
        !            81: 
        !            82: /*
        !            83:  * Values in eflags.
        !            84:  */
        !            85: 
        !            86: #define EFL_CF         0x00001
        !            87: #define EFL_PF         0x00004
        !            88: #define EFL_AF         0x00010
        !            89: #define EFL_ZF         0x00040
        !            90: #define EFL_SF         0x00080
        !            91: #define EFL_TF         0x00100
        !            92: #define EFL_IF         0x00200
        !            93: #define EFL_DF         0x00400
        !            94: #define EFL_OF         0x00800
        !            95: #define EFL_IOPL       0x03000
        !            96: #define EFL_NT         0x04000
        !            97: #define EFL_RF         0x10000
        !            98: #define EFL_VM         0x20000
        !            99: #define EFL_AC         0x40000
        !           100: 
        !           101: #define EFL_CLR                0xfff88028
        !           102: #define EFL_SET                0x00000002

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