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Strange address 0xFFFFFF00

paul_met - Jun 3, 2019

		paul_met		Jun 3, 2019
			Faced with a strange address that goes beyond the Sega Saturn memory address space - 0xFFFFFF00. How to track read / write at this address? The Yabause debugger does not allow this. Maybe this address is a mirror of some other address?

		mrkotfw		Jun 3, 2019
			Clear bits 29~31. Yabause won't accept addresses with those bits set. Not sure why it's so strict.

		antime		Jun 3, 2019
			0xFFFFFE00-0xFFFFFFFF is the SH7095/SH7604 on-chip peripheral address range. 0xFFFFFF00 is the DVSR register of the division unit.

		paul_met		Jun 4, 2019
			So how to deal with this address? I need to track the value that is written to this address.

		antime		Jun 4, 2019
			You may have to modify the emulator.

		Ponut		Jun 4, 2019
			Well, this is not an address, per se. It is a register. So the fact it isn't in Yabause debugger is their fault. To be more helpful, this register has read and write permission. So you could create a hack which, at your desired point, issues the command STS DVSR,R# and then check what's in the general purpose register you moved it to.

		paul_met		Jun 4, 2019
			The problem was solved by using the (inconvenient) Mednafen debugger.