Question

I just cannot find the solution to this issue..

What I’m trying to do is calling an assembly function using gcc. Just take a look:

// Somewhere in start.s
global _start_thread
_start_thread:
  ; ...


// Somewhere in UserThread.cpp
extern void _start_thread( pointer );

static void UserMainHack()
{
    _start_thread(((UserThread*)currentThread)->getUserMain());
}

Thanks for any help..

Answer 1

Did you know that many C linkers automatically adds the leading underscore when looking for identifiers? So in the C source (not the assembler source), just remove the leading underscore:

extern void start_thread( pointer );

static void UserMainHack()
{
    start_thread(((UserThread*)currentThread)->getUserMain());
}