ARM/Thumb Interwork

[Bhattacharya, Soubhik]

hi all,

i'm working on a tool that reads and analyzes arm/thumb elf files 
produced by gcc. to do this i need to be able to distinguish between arm 
and thumb code fragments.

arm eabi 2.0 extends generic elf standard to specify how to distinguish 
between arm and thumb code fragments. however, it seems that the cross 
gcc that i have does not follow arm eabi 2.0. so what is the convention 
that gcc follows and how to learn about it?

with the help of 'objdump', i cud see that calls to arm functions from 
thumb code and vice versa is supported thru special wrapper functions 
(__<func>_from_thumb and __<func>_from_arm). this technique will not 
work for a function having a mix of arm and thumb code. are such 
functions supported? what happens if a relocatable object is generated 
with -mcallee-super-interworking?

soubhik.