Hi Grischka,
> Everything is possible. This is software after all.
Yep :-)
> Say your original function is:
> int add(int a, int b) { return a + b; }
> Your replacement (same prototype) is:
> int sub(int a, int b) { return a - b; }
> Have a tool to make it happen:
> void replace_function(TCCState *s, const char *name, void *new)
> {
> char *old = tcc_get_symbol(s, name);
> set_pages_executable(old, 5); //from tccrun.c
> #ifdef ___i386__
> *old = 0xe9;
> *(unsigned*)(old + 1) = (char *)new - old - 5;
> #endif
> }
Excellent! that is way simpler than I expected. I will take it for a spin now.
Thanks a lot for your help
Henry
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