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emul: add useful emul_trace() debugging tool
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emul/emul.c
10
emul/emul.c
@ -7,6 +7,7 @@ They all run on the same kind of virtual machine: A z80 CPU, 64K of RAM/ROM.
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#include "emul.h"
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static Machine m;
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static ushort traceval = 0;
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static uint8_t io_read(int unused, uint16_t addr)
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{
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@ -92,6 +93,15 @@ void emul_loop()
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while (emul_step());
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}
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void emul_trace(ushort addr)
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{
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ushort newval = m.mem[addr+1] << 8 | m.mem[addr];
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if (newval != traceval) {
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traceval = newval;
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fprintf(stderr, "trace: %04x PC: %04x\n", traceval, m.cpu.PC);
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}
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}
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void emul_printdebug()
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{
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fprintf(stderr, "Min SP: %04x\n", m.minsp);
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@ -30,4 +30,5 @@ Machine* emul_init();
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bool emul_step();
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bool emul_steps(unsigned int steps);
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void emul_loop();
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void emul_trace(ushort addr);
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void emul_printdebug();
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