working on debug menu

2025-05-30 18:27:31 -06:00
parent bb572cce69
commit 604a6d79f2
10 changed files with 251 additions and 126 deletions
--- a/lib/debug.c
+++ b/lib/debug.c
@ -0,0 +1,92 @@
+#include <debug.h>
+#include <stdio.h>
+#include <cpu.h>
+#include <emu.h>
+#include <bus.h>
+#include <string.h>
+
+static debug_context ctx;
+
+debug_context *debug_get_context() {
+    return &ctx;
+}
+
+static char **dissasembly;
+
+void debug_init() {
+    dissasembly = malloc(sizeof(char*) * 0x10000);
+    for(int i = 0; i < 0x10000; i++) {
+        dissasembly[i] = malloc(sizeof(char) * 100);
+    }
+}
+
+void debug_update() {
+    switch(ctx.state) {
+        case DS_MAIN:
+            char flags[16];
+            sprintf(flags, "%c%c%c%c",
+                cpu_get_context()->regs.f & (1 << 7) ? 'Z' : '-',
+                cpu_get_context()->regs.f & (1 << 6) ? 'N' : '-',
+                cpu_get_context()->regs.f & (1 << 5) ? 'H' : '-',
+                cpu_get_context()->regs.f & (1 << 4) ? 'C' : '-'
+            );
+
+            char inst[16];
+            inst_to_str(cpu_get_context(), inst);
+            printf("%08lX - %04X: %-12s (%02X %02X %02X) A: %02X F: %s BC: %02X%02X DE: %02X%02X HL: %02X%02X SP: %04X PC: %04X\n", emu_get_context()->ticks, cpu_get_context()->inst_pc, inst, cpu_get_context()->cur_opcode, bus_read(cpu_get_context()->inst_pc+1), bus_read(cpu_get_context()->inst_pc+2), cpu_get_context()->regs.a, flags, cpu_get_context()->regs.b, cpu_get_context()->regs.c, cpu_get_context()->regs.d, cpu_get_context()->regs.e, cpu_get_context()->regs.h, cpu_get_context()->regs.l, cpu_get_context()->regs.sp, cpu_get_context()->regs.pc);
+            printf("> ");
+            char cmd[128];
+            scanf("%s", cmd);
+            if(!strcmp(cmd, "q")) {
+                emu_get_context()->die = true;
+                emu_get_context()->debug = false;
+                emu_get_context()->paused = false;
+                emu_stop();
+            } else if(!strcmp(cmd, "r")) {
+                emu_get_context()->debug = false;
+                emu_get_context()->paused = false;
+            } else if(!strcmp(cmd, "d")) {
+                ctx.dissasembly_target = cpu_get_context()->inst_pc;
+                ctx.state = DS_DISASSEMBLE; 
+            } else if(!strcmp(cmd, "da")) {
+                scanf("%d", &ctx.dissasembly_target);
+                ctx.state = DS_DISASSEMBLE;
+            } else if(!strcmp(cmd, "du")) {
+                ctx.dissasembly_target--;
+                ctx.state = DS_DISASSEMBLE;
+            } else if(!strcmp(cmd, "dd")) {
+                scanf("%d", &ctx.dissasembly_target);
+                ctx.state = DS_DISASSEMBLE;
+            } else if(cmd[0] == 's') {
+                int steps;
+                scanf("%d", &steps);
+                printf("adding %d steps\n", steps);
+                emu_get_context()->step += steps;
+                emu_get_context()->debug = false;
+            }
+        break;
+        case DS_DISASSEMBLE:
+            cpu_context cpu_ctx = {0};
+            u16 i = 0;
+            while (cpu_ctx.regs.pc <= 0xFFFF) {
+                u16 pc = cpu_ctx.regs.pc;
+                fetch_instruction(&cpu_ctx);
+                fetch_data(&cpu_ctx);
+                char inst[16];
+                inst_to_str(cpu_get_context(), inst);
+                sprintf(dissasembly[i], "%04X: %s", pc, inst);
+                if(pc == cpu_get_context()->inst_pc) {
+                    ctx.dissasembly_scroll = i - 5;
+                    ctx.dissasembly_pc = i;
+                }
+                i++;
+                if(cpu_ctx.regs.pc < pc)
+                    break;
+            }
+            for(int j = ctx.dissasembly_scroll; j < ctx.dissasembly_pc+6; j++) {
+                printf("%c %s\n", j == ctx.dissasembly_pc ? '>' : ' ', dissasembly[j]);
+            }
+            ctx.state = DS_MAIN;
+        break;
+    }
+}