I am trying to set a breakpoint in qemu. That is, a function of mine should run when guest eip becomes equal to some specified address. I set the bp using : cpu_breakpoint_insert(first_cpu, 0xc103364f, BP_GDB, NULL) <exec.c>
Then I do cpu_set_debug_excp_handler(NULL) <cpu-exec.c> because the default excp handler accesses some gdbserver variables which are not available in my case as I am not running gdbserver.
Now, when the specified address is hit, cpu_handle_debug_exception() <cpu-exec.c> is called. So, I do my required processing
here. But, I am unable to resume the vm. The guest's eip stays the same and this function keeps getting called over and over again. So, how should I resume the vm? I know this is possible because gdbstub does this. But I have stepped through the whole code and still can't figure
out how are they doing it!
P.S. I am working on qemu-0.13 and am not using kvm.