Break on Memory Access?

Khyron · 20 August 2010, 22:19

Anyone know if there's a way, in the debugger (or some other tool) to break when a specific memory location is written to ror read from?

I'm trying to find some code in kickstart 2.X & 3.X that are acessing a specific chipset register so I can modify it..

TCD · 20 August 2010, 22:22

Start the WinUAE debugger with 'Shift + F12' and use :
f <address> Add/remove breakpoint
Type 'h' to get a list of available commands

Edit : Maybe try
w <num> <address> <length> <R/W/I/F/C> [<value>] (read/write/opcode/freeze/mustchange)
Add/remove memory watchpoints
as well.

Toni Wilen · 20 August 2010, 22:39

You want to use 'w' command (f is break when PC equals address). Basic syntax: w <index> <address> <length> <r/w/rw>. Check help for other options.

Note that all break points are unreliable in JIT modes.

Khyron · 21 August 2010, 00:10

Thanks Guys!! the w command works fine.. had the JIT enabled which was causing the problem.

Going to modify a PAL A600 to NTSC (swap the encoder or main xtal etc..), so It can be used on a regular NTSC TV.. just had to find a way to switch the PAL agnus to NTSC early on. Kickstart 1.3 was easy, but 2.X&3.1 would go and modify the register back to PAL a few times during the init..

20 August 2010, 22:19	#1
Khyron Registered User Join Date: Feb 2010 Location: SnowLand, Canada Posts: 74	Break on Memory Access? Anyone know if there's a way, in the debugger (or some other tool) to break when a specific memory location is written to ror read from? I'm trying to find some code in kickstart 2.X & 3.X that are acessing a specific chipset register so I can modify it..

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20 August 2010, 22:22	#2
TCD HOL/FTP busy bee Join Date: Sep 2006 Location: Germany Age: 46 Posts: 31,522	Start the WinUAE debugger with 'Shift + F12' and use : f <address> Add/remove breakpoint Type 'h' to get a list of available commands Edit : Maybe try w <num> <address> <length> <R/W/I/F/C> [<value>] (read/write/opcode/freeze/mustchange) Add/remove memory watchpoints as well.

20 August 2010, 22:39	#3
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,505	You want to use 'w' command (f is break when PC equals address). Basic syntax: w <index> <address> <length> <r/w/rw>. Check help for other options. Note that all break points are unreliable in JIT modes.

21 August 2010, 00:10	#4
Khyron Registered User Join Date: Feb 2010 Location: SnowLand, Canada Posts: 74	Thanks Guys!! the w command works fine.. had the JIT enabled which was causing the problem. Going to modify a PAL A600 to NTSC (swap the encoder or main xtal etc..), so It can be used on a regular NTSC TV.. just had to find a way to switch the PAL agnus to NTSC early on. Kickstart 1.3 was easy, but 2.X&3.1 would go and modify the register back to PAL a few times during the init..

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