Analysing the GBA .elf.map

gba_elf_map.txt

Analysing the GBA .elf.map
--------------------------

The gba linker script can be found under

/opt/devkitPro/devkitARM/arm-none-eabi/lib/gba_cart.ld

This can be used to see which sections in the .elf go into which parts of memory on the GBA

ROM:
	.init
	.plt
	.text
	.fini
	.rodata
	.ctors
	.dtors
	.eh_frame
	.gcc_except_table

IWRAM
	.iwram
	.bss
	.data
	.preinit_array
	.init_array
	.fini_array
	.jcr
	.iwram[0-9]

EWRAM
	.ewram
	.sbss

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Open MyProject.elf.map in AMAP (http://www.sikorskiy.net/prj/amap/)

You can see which sections are using up how much memory, and which files and symbols are contributing to that usage.

IWRAM is the main one to watch out for. Lots of stuff can inadvertantly end up there, and it's the most precious resource.

In particular, variables will go into the .data and .bss sections by default... So you should always keep an eye on these to make sure there's nothing hogging them!

Might be worth turning off malloc and stuff?
e.g. see this thread: https://devkitpro.org/viewtopic.php?t=8834