75 lines
2.6 KiB
C
75 lines
2.6 KiB
C
#include <stdio.h>
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#include <inttypes.h>
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#include <stdbool.h>
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#include "toy.h"
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#include "helper.h"
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#include <assert.h>
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#ifndef NDEBUG
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#define DEBUG
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#endif
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int main(int argc, char *argv[])
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{
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uint16_t ram[RAM_SIZE];
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uint16_t ir=0; //Instruction Register
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uint8_t op_code; //CPU Operation Code
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uint16_t pc = 0; //Program Counter
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uint16_t data_addr=0; //Address of the 2nd operand (1. is ACCU)
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int quit='n'; //Helper for program-flow exit (not part of CPU)
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bool run = true; //CPU halt and reset.(Nb: make a coredump beforehand)
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printf("\n+++++++++++++++++++++++++++++++++++++++++++++++\n+Boot: "CPU_TYPE
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" with %lu x %lu Bit RAM.+\n+++++++++++++++++++++++++++++++++++++++++++++++\n\n"
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,(unsigned long)(sizeof(ram)/sizeof(ram[0])),(unsigned long)sizeof(ram[0])*8);
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if(initialise_ram(ram,argc,argv)==-1) return 1; /*load data from command line into RAM
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(-1 in case of error,
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else number of correctly read words)*/
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while(run)
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{
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ir = ram[pc]; //get instruction from RAM
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op_code = get_opcode(ir); //determine the instruction form
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data_addr=get_data(ir); /*locate the 2nd operand
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(undefined for OP_Codes 8 to 15)*/
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//handle user output
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printf("\ninstruction:\t");
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fprintBits(sizeof(*ram), ram+pc,stdout);
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printf("OP CODE: %"PRIu8"\tmeans: ",op_code);
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print_instruction(op_code);
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printf("address: %"PRIu16"\tcontent:%"
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PRIu16"\n",data_addr,ram[data_addr]);
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printf("RAM position:\t%"PRIu16"\n",pc);
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printf("\ninstruction result:\n");
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//CPU control flow
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if(execute(op_code,data_addr,ram)) //EXECUTE instruction,jump on ALU
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pc=get_data(ir);
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else pc++;
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if(pc>=RAM_SIZE) pc %= RAM_SIZE; //TOY_CPU can only address 12 bits
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//handle user output
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printf("ACCU: %d\n",get2compl(*ACCU));
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printf("PROGRAM COUNTER: %" PRIu16
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"\n----------------------------------------",pc);
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printf("\n|(n)ext step or (q)uit or (c)oredump ? ");
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//handle program flow
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while((quit = getchar()) != '\n')
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{
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switch(quit)
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{
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case EOF: break;
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case 'c': makeHexDump(true,ram); break;
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case 'q': run = false;
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}
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}
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printf("----------------------------------------\n");
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}
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return 0;
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}
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