Function doexcstack

src/cputest.cpp:1295–1362

}

static void doexcstack(void)
{
	bool g1 = generates_group1_exception(regs.ir);
	uaecptr original_pc = regs.pc;

	doexcstack2();
	if (test_exception < 4)
		return;

	// did we got bus error or address error
	// when fetching exception vector?
	// (bus error not yet tested)
	if (!feature_exception_vectors)
		return;

	int interrupt = test_exception >= 24 && test_exception < 24 + 8;
	int original_exception = test_exception;
	// odd exception vector
	test_exception = 3;
	test_exception_addr = feature_exception_vectors;

	// store original exception stack (which may not be complete)
	uae_u8 *sf = test_memory + test_memory_size + EXTRA_RESERVED_SPACE - exception_stack_frame_size;
	exception_extra_frame_size = exception_stack_frame_size;
	exception_extra_frame_type = original_exception;
	memcpy(exception_extra_frame, sf, exception_extra_frame_size);

	MakeSR();
	regs.sr |= 0x2000;
	regs.sr &= ~(0x8000 | 0x4000);
	MakeFromSR();

	regs.pc = original_exception * 4;

	int flags = 0;
	if (cpu_lvl == 1) {
		// IF = 1
		flags |= 0x40000;
		// low word of address
		regs.irc = (uae_u16)test_exception_addr;
		// low word of address
		regs.read_buffer = regs.irc;
		// vector offset (not vbr + offset)
		regs.write_buffer = original_exception * 4;
		regs.pc = original_pc;
	}

	if (interrupt) {
		regs.intmask = original_exception - 24;
		regs.ir = original_exception;
		if (cpu_lvl == 0) {
			flags |= 0x10000 | 0x20000;
		} else {
			flags |= 0x20000;
		}
		if (cpu_lvl < 5) {
			regs.m = 0;
		}