diff --git a/proctl/threads.go b/proctl/threads.go
index 080f36ca..7e4ded09 100644
--- a/proctl/threads.go
+++ b/proctl/threads.go
@@ -90,14 +90,11 @@ func (thread *ThreadContext) CallFn(name string, fn func() error) error {
 	}
 	defer thread.Process.Clear(bp.Addr)
 
-	if err = thread.saveRegisters(); err != nil {
-		return err
-	}
-
-	regs, err := thread.Registers()
+	regs, err := thread.saveRegisters()
 	if err != nil {
 		return err
 	}
+
 	previousFrame := make([]byte, f.FrameSize)
 	frameSize := uintptr(regs.SP() + uint64(f.FrameSize))
 	if _, err := readMemory(thread, frameSize, previousFrame); err != nil {
diff --git a/proctl/threads_darwin.go b/proctl/threads_darwin.go
index a005e8df..00b656f0 100644
--- a/proctl/threads_darwin.go
+++ b/proctl/threads_darwin.go
@@ -83,12 +83,12 @@ func readMemory(thread *ThreadContext, addr uintptr, data []byte) (int, error) {
 	return len(data), nil
 }
 
-func (thread *ThreadContext) saveRegisters() error {
+func (thread *ThreadContext) saveRegisters() (Registers, error) {
 	kret := C.get_registers(C.mach_port_name_t(thread.os.thread_act), &thread.os.registers)
 	if kret != C.KERN_SUCCESS {
-		return fmt.Errorf("could not save register contents")
+		return nil, fmt.Errorf("could not save register contents")
 	}
-	return nil
+	return &Regs{pc: uint64(thread.os.registers.__rip), sp: uint64(thread.os.registers.__rsp)}, nil
 }
 
 func (thread *ThreadContext) restoreRegisters() error {
diff --git a/proctl/threads_linux.go b/proctl/threads_linux.go
index 603a6cd8..eca030d6 100644
--- a/proctl/threads_linux.go
+++ b/proctl/threads_linux.go
@@ -50,8 +50,11 @@ func (t *ThreadContext) blocked() bool {
 	return false
 }
 
-func (thread *ThreadContext) saveRegisters() error {
-	return sys.PtraceGetRegs(thread.Id, &thread.os.registers)
+func (thread *ThreadContext) saveRegisters() (Registers, error) {
+	if err := sys.PtraceGetRegs(thread.Id, &thread.os.registers); err != nil {
+		return nil, fmt.Errorf("could not save register contents")
+	}
+	return &Regs{&thread.os.registers}, nil
 }
 
 func (thread *ThreadContext) restoreRegisters() error {