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Annotation of researchv9/jerq/sgs/inc/patch.h, revision 1.1

1.1     ! root        1: /*
        !             2:  * static char ID_patch[] = "@(#) patch.h: 1.3 7/23/82";
        !             3:  */
        !             4: 
        !             5: struct plist
        !             6: {
        !             7:        long blk_cnt;                   /* the number of blocks */
        !             8:        union pentry
        !             9:        {
        !            10:                struct
        !            11:                {
        !            12:                        long            blk_addr;       /* block address    */
        !            13:                        long            blk_size;       /* size of block    */
        !            14:                        unsigned short  blk_scnum;      /* section of block */
        !            15:                        char            blk_type;       /* type of block    */
        !            16:                        char            blk_pad;        /* padding          */
        !            17:                } type01;                               /* FREE or OLD FCN  */
        !            18:                struct
        !            19:                {
        !            20:                        long            blk_addr;       /* block address    */
        !            21:                        long            blk_ndx;        /* fcn tv index     */
        !            22:                        unsigned short  blk_scnum;      /* section of block */
        !            23:                        char            blk_type;       /* type of block    */
        !            24:                        char            blk_size;       /* size of block    */
        !            25:                } type2;                                /* DECF             */
        !            26:        } block[1];
        !            27: };
        !            28: 
        !            29: #define PLIST  struct plist
        !            30: #define PENTRY union pentry
        !            31: 
        !            32: #define PLSIZE sizeof(PLIST)
        !            33: #define PESIZE sizeof(PENTRY)
        !            34: 
        !            35: /*
        !            36:  * There are three types of patch list items:
        !            37:  *
        !            38:  *     type0   : a block of FREE, unallocated patch space. This space
        !            39:  *                     can be used for overwrites
        !            40:  *     type1   : a block of text space belonging to a function which
        !            41:  *                     has been replaced. The OLD Function can still
        !            42:  *                     be active
        !            43:  *     type2   : a DECision Function, currently in use
        !            44:  */
        !            45: 
        !            46: #define FREE_patch     0
        !            47: #define OLDF_patch     1
        !            48: #define DECF_patch     2
        !            49: 
        !            50: /*
        !            51:  * Specify the number of bytes to leave at the start of any replaced
        !            52:  * function, when tv are not being used
        !            53:  *
        !            54:  * This space holds the explicit branch instruction - a "pseudo tv" -
        !            55:  * and must be an integral number of words, to insure proper function
        !            56:  * alignment
        !            57:  */
        !            58: 
        !            59: #define BRANCH 8

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