Hello,
I hope somebody can clarify this issue for me - I am sure it is somewhere in th ABI for it escapes me. Using ARM7 architecture (LPC2478), I have a function written in C that is called (BL) from the startup file. The problem is that the compiler does not generate a "BX LR" instruction at its end. Is there some limitation in place that I am not aware of?
I think this is a tool chain but - if I place the function that is called from startup code in a separate C module - a "BX LR" is generated!
if I place the function that is called from startup code in a separate C module - a "BX LR" is generated!
And you're sure that's not just because the compiler inlined that function, and thus there was no need to return from it?
A little actual source and actual assembler output of both that function and its caller would go a long way towards clarifying this puzzle...