I am trying to determine, in run-time, the where a function was called
from. I believe that the standard way of doing this on an x86 is by
looking at the top of the stack pointed to by the EBP register. I.e.,
the following code should yield the return address in 'addr':
asm volatile("movl 0x4(%%ebp), %0\n" : "=r"(addr));
However, looking at the assembly code of the function I'm interested in
(update_process_times), the calling convention looks odd: EBP is not
pushed, and RET is not invoked at the end. I assume this has something
to do with the function being called in interrupt context?
So, my questions:
1. Why is update_process_times() not using the standard function
invocation/return procedure?
2. How is this determined in compile time? I can see no special
attribute associated with the function declaration/definition
3. How can the calling function be determined in run-time?
Thanks,
Elad
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