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emul: add useful emul_trace() debugging tool

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This commit is contained in:
Virgil Dupras 2020-03-29 22:13:54 -04:00
parent 48078d9c9c
commit d2dcd96ce1
2 changed files with 11 additions and 0 deletions
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10
emul/emul.c
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@ -7,6 +7,7 @@ They all run on the same kind of virtual machine: A z80 CPU, 64K of RAM/ROM.
#include "emul.h" #include "emul.h"
static Machine m; static Machine m;
static ushort traceval = 0;
static uint8_t io_read(int unused, uint16_t addr) static uint8_t io_read(int unused, uint16_t addr)
{ {
@ -92,6 +93,15 @@ void emul_loop()
while (emul_step()); while (emul_step());
} }
void emul_trace(ushort addr)
{
ushort newval = m.mem[addr+1] << 8 | m.mem[addr];
if (newval != traceval) {
traceval = newval;
fprintf(stderr, "trace: %04x PC: %04x\n", traceval, m.cpu.PC);
}
}
void emul_printdebug() void emul_printdebug()
{ {
fprintf(stderr, "Min SP: %04x\n", m.minsp); fprintf(stderr, "Min SP: %04x\n", m.minsp);

1
emul/emul.h
View File

@ -30,4 +30,5 @@ Machine* emul_init();
bool emul_step(); bool emul_step();
bool emul_steps(unsigned int steps); bool emul_steps(unsigned int steps);
void emul_loop(); void emul_loop();
void emul_trace(ushort addr);
void emul_printdebug(); void emul_printdebug();