For i386, I'm considering writing a native debugger for QEMU that is not GDB.
It would allow a separate/new windowed interface which would show disassembly,
registers, stack, local variables, memory windows, etc., allowing the user to
single-step through code and trap opcodes like INT 1, INT 3, INT 4, etc. It
would be invoked with something like "qemu -debugger" from the command line,
and would have a UI similar to Microsoft's Debugger in Visual Studio when no
PDB is available, but would show a similar type of disassembly form.
I was looking at the QEMU code and I can't find an obvious place where it seems
to iterate through each CPU instruction, which is where I had in mind to add a
hook.
Can someone get me pointed in the right direction? Where will I look for
something like this:
for (;;)
{
execute_next_instruction();
}
Thanks and best regards,
Rick C. Hodgin
