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Is it possible to programmatically break into debugger from GCC?
For example I want something like:
#define STOP_EXECUTION_HERE ???
which when put on some code line will force debugger stop there.
Is it possible at all ?
I found some solution, but i can’t use it because on my embedded ARM system I don’t have signal.h.
(However I can use inline assembly).
What you are trying to do is called software breakpoint
It is very hard to say precisely without knowing how you actually debug. I assume your embedded system runs gdbstub. There are various possibilities how this can be supported:
Use dedicated BKPT instruction
This could be a standard way on your system and debugger to support software breakpoints
Feed invalid instruction to CPU
gdbstub could have placed own
UNDEFARM mode handler placed. If you go this route you must be aware of current CPU mode (ARM or THUMB), because instruction size will be different. Examples of undefined instructions:In runtime CPU mode could be found from the lowest bit of PC register. But the easier way is to know how you compiled object file, where you placed software breakpoint
Use SWI instruction
We did so when used RealView ICE. Most likely this does not apply to you, if you run some OS on your embedded system. SWI is usually used by OS to implement system calls