mirror of https://github.com/st3fan/ewm.git
221 lines
7.7 KiB
C
221 lines
7.7 KiB
C
// The MIT License (MIT)
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//
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// Copyright (c) 2015 Stefan Arentz - http://github.com/st3fan/ewm
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#include <stdio.h>
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#include <string.h>
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#include "cpu.h"
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#include "ins.h"
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#include "mem.h"
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#include "fmt.h"
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void cpu_format_state(struct cpu_t *cpu, char *buffer) {
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sprintf(buffer, "A=%.2X X=%.2X Y=%.2X S=%.2X SP=%.2X %c%c%c%c%c%c%c%c",
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cpu->state.a, cpu->state.x, cpu->state.y, _cpu_get_status(cpu), cpu->state.sp,
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cpu->state.n ? 'N' : '-',
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cpu->state.v ? 'V' : '-',
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'-',
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cpu->state.b ? 'B' : '-',
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cpu->state.d ? 'D' : '-',
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cpu->state.i ? 'I' : '-',
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cpu->state.z ? 'Z' : '-',
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cpu->state.c ? 'C' : '-');
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}
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void cpu_format_stack(struct cpu_t *cpu, char buffer[764]) {
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buffer[0] = 0x00;
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if (cpu->state.sp != 0xff) {
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char *p = buffer;
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*p = 0x00;
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p = strcat(p, "[");
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for (uint16_t sp = cpu->state.sp; sp != 0xff; sp++) {
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if (sp != cpu->state.sp) {
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p = strcat(p, " ");
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}
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char tmp[8];
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sprintf(tmp, "%.2X", mem_get_byte(cpu, 0x0100 + sp + 1));
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p = strcat(p, tmp);
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}
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strcat(p, "]");
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}
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}
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void cpu_format_instruction(struct cpu_t *cpu, char *buffer) {
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*buffer = 0x00;
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uint8_t opcode = mem_get_byte(cpu, cpu->state.pc);
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struct cpu_instruction_t *i = &cpu->instructions[opcode];
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if (i->handler == NULL) {
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sprintf(buffer, "???");
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return;
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}
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/* Single byte instructions */
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if (i->bytes == 1) {
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sprintf(buffer, "%-4s", i->name);
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}
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/* 65C02 ADC, AND, CMP, EOR, LDA, ORA, SBC, STA */
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else if ((opcode & 0b00011111) == 0b00010010) {
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sprintf(buffer, "%-4s $%.2X", i->name, mem_get_byte(cpu, cpu->state.pc+1));
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}
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/* 65C02 RMB / SMB */
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else if ((opcode & 0b00001111) == 0b00000111) {
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sprintf(buffer, "%s%d $%.2X",
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(opcode & 0b10000000) == 0b00000000 ? "RMB" : "SMB",
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(opcode & 0b01110000) >> 4,
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mem_get_byte(cpu, cpu->state.pc+1));
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}
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/* 65C02 BBR / BBS */
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else if ((opcode & 0b00001111) == 0b00001111) {
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sprintf(buffer, "%s%d $%.2X,$%.4X",
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(opcode & 0b10000000) == 0b00000000 ? "BBR" : "BBS",
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(opcode & 0b01110000) >> 4,
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mem_get_byte(cpu, cpu->state.pc+1),
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cpu->state.pc + 2 + (int8_t) mem_get_byte(cpu, cpu->state.pc+2));
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}
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/* 65C02 JMP (ABS,X) */
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else if (opcode == 0x7c) {
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sprintf(buffer, "JMP ($%.4X,X)", mem_get_word(cpu, cpu->state.pc+1));
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}
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/* 65C02 BRA */
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else if (opcode == 0x80) {
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sprintf(buffer, "BRA $%.4X", cpu->state.pc + 2 + (int8_t) mem_get_byte(cpu, cpu->state.pc+1));
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}
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/* 65C02 STZ ABS */
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else if (opcode == 0x9c) {
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sprintf(buffer, "JMP $%.4X", mem_get_word(cpu, cpu->state.pc+1));
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}
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/* 65C02 TRB ZP */
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else if (opcode == 0x14) {
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sprintf(buffer, "TRB $%.2X", mem_get_byte(cpu, cpu->state.pc+1));
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}
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/* 65C02 TRB ABS */
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else if (opcode == 0x1c) {
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sprintf(buffer, "TRB $%.4X", mem_get_word(cpu, cpu->state.pc+1));
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}
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/* 65C02 TSB ZP */
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else if (opcode == 0x04) {
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sprintf(buffer, "TSB $%.2X", mem_get_byte(cpu, cpu->state.pc+1));
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}
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/* 65C02 TSB ABS */
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else if (opcode == 0x0c) {
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sprintf(buffer, "TSB $%.4X", mem_get_word(cpu, cpu->state.pc+1));
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}
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/* JSR is the only exception */
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else if (opcode == 0x20) {
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sprintf(buffer, "%-4s $%.4X", i->name, mem_get_word(cpu, cpu->state.pc+1));
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}
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/* Branches */
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else if ((opcode & 0b00011111) == 0b00010000) {
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int8_t offset = (int8_t) mem_get_byte(cpu, cpu->state.pc+1);
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uint16_t addr = cpu->state.pc + 2 + offset;
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sprintf(buffer, "%-4s $%.4X", i->name, addr);
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}
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else if ((opcode & 0b00000011) == 0b00000001) {
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switch ((opcode & 0b00011100) >> 2) {
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case 0b000:
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sprintf(buffer, "%-4s ($%.2X,X)", i->name, mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b001:
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sprintf(buffer, "%-4s $%.2X", i->name, mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b010:
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sprintf(buffer, "%-4s #$%.2X", i->name, mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b011:
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sprintf(buffer, "%-4s $%.2X%.2X", i->name, mem_get_byte(cpu, cpu->state.pc+2), mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b100:
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sprintf(buffer, "%-4s ($%.2X),Y", i->name, mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b101:
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sprintf(buffer, "%-4s $%.2X,X", i->name, mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b110:
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sprintf(buffer, "%-4s $%.2X%.2X,Y", i->name, mem_get_byte(cpu, cpu->state.pc+2), mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b111:
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sprintf(buffer, "%-4s $%.2X%.2X,X", i->name, mem_get_byte(cpu, cpu->state.pc+2), mem_get_byte(cpu, cpu->state.pc+1));
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break;
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}
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}
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else if ((opcode & 0b00000011) == 0b00000010) {
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switch ((opcode & 0b00011100) >> 2) {
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case 0b000:
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sprintf(buffer, "%-4s #$%.2X", i->name, mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b001:
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sprintf(buffer, "%-4s $%.2X", i->name, mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b010:
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sprintf(buffer, "%-4s", i->name);
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break;
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case 0b011:
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sprintf(buffer, "%-4s $%.2X%.2X", i->name, mem_get_byte(cpu, cpu->state.pc+2), mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b101:
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sprintf(buffer, "%-4s $%.2X,X", i->name, mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b111:
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sprintf(buffer, "%-4s $%.2X%.2X,X", i->name, mem_get_byte(cpu, cpu->state.pc+2), mem_get_byte(cpu, cpu->state.pc+1));
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break;
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}
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}
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else if ((opcode & 0b00000011) == 0b00000000) {
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switch ((opcode & 0b00011100) >> 2) {
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case 0b000:
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sprintf(buffer, "%-4s #$%.2X", i->name, mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b001:
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sprintf(buffer, "%-4s $%.2X", i->name, mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b011:
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sprintf(buffer, "%-4s $%.2X%.2X", i->name, mem_get_byte(cpu, cpu->state.pc+2), mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b101:
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sprintf(buffer, "%-4s $%.2X,X", i->name, mem_get_byte(cpu, cpu->state.pc+1));
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break;
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case 0b111:
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sprintf(buffer, "%-4s $%.2X%.2X,X", i->name, mem_get_byte(cpu, cpu->state.pc+2), mem_get_byte(cpu, cpu->state.pc+1));
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break;
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}
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}
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}
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