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Annotation of researchv10dc/630/3binc/patch.h, revision 1.1.1.1

1.1       root        1: #ident "@(#)sgs-inc:common/patch.h     1.3.1.1"
                      2: 
                      3: struct plist
                      4: {
                      5:        long blk_cnt;                   /* the number of blocks */
                      6:        union pentry
                      7:        {
                      8:                struct
                      9:                {
                     10:                        long            blk_addr;       /* block address    */
                     11:                        long            blk_size;       /* size of block    */
                     12:                        unsigned short  blk_scnum;      /* section of block */
                     13:                        char            blk_type;       /* type of block    */
                     14:                        char            blk_pad;        /* padding          */
                     15:                } type01;                               /* FREE or OLD FCN  */
                     16:                struct
                     17:                {
                     18:                        long            blk_addr;       /* block address    */
                     19:                        long            blk_ndx;        /* fcn tv index     */
                     20:                        unsigned short  blk_scnum;      /* section of block */
                     21:                        char            blk_type;       /* type of block    */
                     22:                        char            blk_size;       /* size of block    */
                     23:                } type2;                                /* DECF             */
                     24:        } block[1];
                     25: };
                     26: 
                     27: #define PLIST  struct plist
                     28: #define PENTRY union pentry
                     29: 
                     30: #define PLSIZE sizeof(PLIST)
                     31: #define PESIZE sizeof(PENTRY)
                     32: 
                     33: /*
                     34:  * There are three types of patch list items:
                     35:  *
                     36:  *     type0   : a block of FREE, unallocated patch space. This space
                     37:  *                     can be used for overwrites
                     38:  *     type1   : a block of text space belonging to a function which
                     39:  *                     has been replaced. The OLD Function can still
                     40:  *                     be active
                     41:  *     type2   : a DECision Function, currently in use
                     42:  */
                     43: 
                     44: #define FREE_patch     0
                     45: #define OLDF_patch     1
                     46: #define DECF_patch     2
                     47: 
                     48: /*
                     49:  * Specify the number of bytes to leave at the start of any replaced
                     50:  * function, when tv are not being used
                     51:  *
                     52:  * This space holds the explicit branch instruction - a "pseudo tv" -
                     53:  * and must be an integral number of words, to insure proper function
                     54:  * alignment
                     55:  */
                     56: 
                     57: #define BRANCH 8

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