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GDB: Do not stop for jumps into BIOS when debug stepping code

This commit is contained in:
Felix Jones 2025-06-22 17:13:58 +02:00
parent 42b8537a6d
commit 71df6af839
1 changed files with 18 additions and 0 deletions
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18
src/debugger/gdb-stub.c
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@ -255,7 +255,25 @@ static void _continue(struct GDBStub* stub, const char* message) {
} }
static void _step(struct GDBStub* stub, const char* message) { static void _step(struct GDBStub* stub, const char* message) {
const struct ARMCore* cpu = stub->d.p->core->cpu;
const int32_t pc = cpu->gprs[ARM_PC];
stub->d.p->core->step(stub->d.p->core); stub->d.p->core->step(stub->d.p->core);
if (pc >= GBA_SIZE_BIOS && cpu->gprs[ARM_PC] < GBA_SIZE_BIOS) {
// GDB cannot cope with jumps into BIOS
// skip over them by placing a temporary breakpoint at PC (instruction after the jump)
// and then continue without sending a GDB SIGTRAP
const struct mBreakpoint breakpoint = {
.address = pc,
.type = BREAKPOINT_HARDWARE,
.isTemporary = true
};
stub->d.p->platform->setBreakpoint(stub->d.p->platform, &stub->d, &breakpoint);
_continue(stub, message);
return;
}
snprintf(stub->outgoing, GDB_STUB_MAX_LINE - 4, "S%02x", SIGTRAP); snprintf(stub->outgoing, GDB_STUB_MAX_LINE - 4, "S%02x", SIGTRAP);
_sendMessage(stub); _sendMessage(stub);
// TODO: parse message // TODO: parse message