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 } 39