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Annotation of 43BSDReno/sys/tahoealign/Awrite_byte.c, revision 1.1

1.1     ! root        1: /*     Awrite_byte.c   1.1     86/07/20        */
        !             2: 
        !             3: #include       "../tahoealign/align.h"
        !             4: 
        !             5: write_byte (infop,byte, where)
        !             6: process_info   *infop;
        !             7: long           byte; 
        !             8: struct oprnd   *where;
        !             9: /*
        !            10: /*     Put the 'byte' at the given address in
        !            11: /*     tahoe's memory.
        !            12: /*     
        !            13: /*     1. Only the least significant byte is written.
        !            14: /*
        !            15: /**************************************************/
        !            16: {
        !            17:        register struct operand_des *look_at;
        !            18: 
        !            19:        look_at = &Table[opCODE].operand[last_operand];
        !            20:        if (! (look_at->add_modes & NOVF))
        !            21:                if (byte > 0x7f || byte < -0x80) overflow_1;    
        !            22:        if (!(where->mode & W)) exception(infop, ILL_ADDRMOD);
        !            23:        switch (where->mode & ADDFIELD) /* Mask out R/W bits */
        !            24:        {
        !            25:        case Add:
        !            26:                put_byte(infop, byte, where->address);
        !            27:                break;
        !            28:        case Dir:
        !            29:                Replace (infop, where->reg_number, byte);
        !            30:                break;
        !            31:        case SPmode:
        !            32:                where->mode = where->mode & ~SPmode | Add;
        !            33:                write_longword (infop, byte, where);
        !            34:                break;
        !            35:        default:
        !            36:                printf("Unknown destination in write_byte (alignment code)\n");
        !            37:        };
        !            38: }      

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