// SetPC sets the RIP register to the value specified by `pc`.
func (r *Regs) SetPC(thread *Thread, pc uint64) error {
var context C.CONTEXT
context.ContextFlags = C.CONTEXT_ALL
res := C.GetThreadContext(C.HANDLE(thread.os.hThread), &context)
if res == C.FALSE {
return fmt.Errorf("could not GetThreadContext")
}
context.Rip = C.DWORD64(pc)
res = C.SetThreadContext(C.HANDLE(thread.os.hThread), &context)
if res == C.FALSE {
return fmt.Errorf("could not SetThreadContext")
}
return nil
}
func (t *Thread) singleStep() error {
var context C.CONTEXT
context.ContextFlags = C.CONTEXT_ALL
// Set the processor TRAP flag
res := C.GetThreadContext(C.HANDLE(t.os.hThread), &context)
if res == C.FALSE {
return fmt.Errorf("could not GetThreadContext")
}
context.EFlags |= 0x100
res = C.SetThreadContext(C.HANDLE(t.os.hThread), &context)
if res == C.FALSE {
return fmt.Errorf("could not SetThreadContext")
}
// Suspend all threads except this one
for _, thread := range t.dbp.Threads {
if thread.ID == t.ID {
continue
}
res := C.SuspendThread(C.HANDLE(thread.os.hThread))
if res == C.DWORD(0xFFFFFFFF) {
return fmt.Errorf("could not suspend thread: %d", thread.ID)
}
}
// Continue and wait for the step to complete
t.dbp.execPtraceFunc(func() {
res = C.ContinueDebugEvent(C.DWORD(t.dbp.Pid), C.DWORD(t.ID), C.DBG_CONTINUE)
})
if res == C.FALSE {
return fmt.Errorf("could not ContinueDebugEvent.")
}
_, err := t.dbp.trapWait(0)
if err != nil {
return err
}
// Resume all threads except this one
for _, thread := range t.dbp.Threads {
if thread.ID == t.ID {
continue
}
res := C.ResumeThread(C.HANDLE(thread.os.hThread))
if res == C.DWORD(0xFFFFFFFF) {
return fmt.Errorf("ould not resume thread: %d", thread.ID)
}
}
// Unset the processor TRAP flag
res = C.GetThreadContext(C.HANDLE(t.os.hThread), &context)
if res == C.FALSE {
return fmt.Errorf("could not GetThreadContext")
}
context.EFlags &= ^C.DWORD(0x100)
res = C.SetThreadContext(C.HANDLE(t.os.hThread), &context)
if res == C.FALSE {
return fmt.Errorf("could not SetThreadContext")
}
return nil
}