watchpoint on virtual memory space

[jotego]

I am looking into the Namco System 1 driver. It has a hack related to the MCU marked in the driver as a very obscure point and I am trying to make sense of it by measuring the real MCU on the board.

Related to this, I am trying to see how the CPUs interact. But, I find it very hard to catch writes to memory because two of the CPUs use a memory mapper. This mapper has a virtual_map address space (in namcos1.cpp)

void namcos1_state::virtual_map(address_map &map)
{
	map(0x2c0000, 0x2c1fff).w(FUNC(namcos1_state::_3dcs_w));
	map(0x2e0000, 0x2e7fff).rw(m_c116, FUNC(namco_c116_device::read), FUNC(namco_c116_device::write));
	map(0x2f0000, 0x2f7fff).rw(m_c123tmap, FUNC(namco_c123tmap_device::videoram8_r), FUNC(namco_c123tmap_device::videoram8_w));
	map(0x2f8000, 0x2f9fff).rw(FUNC(namcos1_state::no_key_r), FUNC(namcos1_state::no_key_w));
	map(0x2fc000, 0x2fcfff).ram().w(FUNC(namcos1_state::spriteram_w)).share("spriteram");
	map(0x2fd000, 0x2fd01f).rw(m_c123tmap, FUNC(namco_c123tmap_device::control8_r), FUNC(namco_c123tmap_device::control8_w)).mirror(0xfe0);
	map(0x2fe000, 0x2fe3ff).ram().rw("namco", FUNC(namco_cus30_device::namcos1_cus30_r), FUNC(namco_cus30_device::namcos1_cus30_w)).mirror(0xc00); /* PSG ( Shared ) */
	map(0x2ff000, 0x2ff7ff).ram().share("triram").mirror(0x800);
	map(0x300000, 0x307fff).ram();
	map(0x400000, 0x7fffff).rom().region("user1", 0);
}

It looks like I cannot normally add watchpoints to this memory map. I have to use the CPU regular memory map, which keeps changing as the CPU programs the mapper.

Is there a way to watch virtual memory maps in the debugger?

[cuavas]

The virtual_map is used by the C117 chip – you might be able to put a watchpoint on it like wpset 1234:c117:program,1,rw

You could also install taps on it with a Lua script.

[jotego]

Thank you. That sounds promising, although it doesn't work:

[cuavas]

Use Lua script (either with -autoboot_script or -console). Something like:

vspace = manager.machine.devices['c117'].spaces['program']
action = function(offset, data) print("Watchpoint hit"); manager.machine.debugger.execution_state = 'stop'; end
wpr = vspace:install_read_tap(0x2fc000, 0x2fc000, "wp", action)
wpw = vspace:install_write_tap(0x2fc000, 0x2fc000, "wp", action)