You know that code won't work on any ARM chip with a cache? :) If you ever
want it to run on the GP32 you'll have to be aware of this.

-----Original Message-----
From: James Daniels [mailto:james.daniels@...]
Sent: 29 November 2002 23:39
To: gbadev@yahoogroups.com
Subject: Re: [gbadev] Self-modifying code branching problem


Hi all,

Just to let you know, I solved the problem by hacking the opcodes as
follows: (it probably won't work for negative offsets though)

...

_stored_branch: .word 0xea000000 +
((target_label-stored_branch_moved_here)/4)-2

...

ldr r10,_stored_branch
str r10,_stored_branch_moved_here

...

stored_branch_moved_here:
mov r0,r0 @ may be overwritten by _stored_branch

...

target_label:

...

It's a bit iffy, but it gets the job done.
--
Cheers,
James.

/\ apex James Daniels
//\\ designs james.daniels@...
//__\\ http://www.apex-designs.net






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