Custom SWI handler or Undefined instruction handler

[ycelik]

Hi all,

Is it possible to "hack" the vector table, so that your GBA uses for example a custom handler
for undefined instructions?
I tried to write to the base 0x04 address, but that did not work (read only memory? Bios protected? tested in no$gba).

Greetings,

Joseph

[fincs]

Unfortunately it isn't possible to use custom exception vectors on GBA, because the memory at 00000000 is occupied by the BIOS (which indeed is read-only).