void start_debugger(pid_t target_pid) {
int status;
wait(&status);
struct user_regs_struct initial_registers;
trace_get_registers(target_pid, &initial_registers);
// Peek at a specific address:
unsigned bp_addr = 0x4000b0;
breakpoint *bp = breakpoint_create(target_pid, (void *)bp_addr);
trace_continue(target_pid);
wait(&status);
while (1) {
if (WIFSTOPPED(status)) {
struct user_regs_struct registers;
trace_get_registers(target_pid, ®isters);
printf("\nReached breakpoint at 0x%08llx\n", registers.rip);
breakpoint_handle(target_pid, bp);
int requesting_input = true;
while (requesting_input) {
input_option input = request_input(NULL);
if (input == INPUT_CONTINUE) {
trace_continue(target_pid);
requesting_input = false;
}
else if (input == INPUT_SINGLE_STEP) {
trace_single_step(target_pid);
requesting_input = false;
}
}
int resume_status;
wait(&resume_status);
if (WIFEXITED(resume_status)) {
printf("Process %d exited\n", target_pid);
return;
}
else if (WIFSTOPPED(resume_status)) {
printf("Process %d stopped\n", target_pid);
return;
}
}
else if (WIFEXITED(status)) {
printf("Process %d exited\n", target_pid);
return;
}
else {
puts("Returning");
return;
}
}
}
static int process_new(struct trace_process *process, int type, void *arg, void *userdata) {
int pid = (long)arg;
struct proc *proc = calloc(1, sizeof(struct proc));
proc->pid = pid;
fprintf(stderr, "[.] #%i start\n", proc->pid);
return trace_continue(process, process_continue, proc);
}