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137 lines
3.1 KiB
Go
137 lines
3.1 KiB
Go
package proc
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// #include "threads_darwin.h"
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// #include "proc_darwin.h"
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import "C"
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import (
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"fmt"
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sys "golang.org/x/sys/unix"
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"unsafe"
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)
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// WaitStatus is a synonym for the platform-specific WaitStatus
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type WaitStatus sys.WaitStatus
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// OSSpecificDetails holds information specific to the OSX/Darwin
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// operating system / kernel.
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type OSSpecificDetails struct {
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threadAct C.thread_act_t
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registers C.x86_thread_state64_t
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exists bool
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}
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// ErrContinueThread is the error returned when a thread could not
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// be continued.
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var ErrContinueThread = fmt.Errorf("could not continue thread")
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func (t *Thread) halt() (err error) {
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kret := C.thread_suspend(t.os.threadAct)
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if kret != C.KERN_SUCCESS {
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errStr := C.GoString(C.mach_error_string(C.mach_error_t(kret)))
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// check that the thread still exists before complaining
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err2 := t.dbp.updateThreadList()
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if err2 != nil {
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err = fmt.Errorf("could not suspend thread %d %s (additionally could not update thread list: %v)", t.ID, errStr, err2)
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return
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}
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if _, ok := t.dbp.Threads[t.ID]; ok {
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err = fmt.Errorf("could not suspend thread %d %s", t.ID, errStr)
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return
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}
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}
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return
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}
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func (t *Thread) singleStep() error {
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kret := C.single_step(t.os.threadAct)
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if kret != C.KERN_SUCCESS {
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return fmt.Errorf("could not single step")
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}
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for {
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twthread, err := t.dbp.trapWait(t.dbp.Pid)
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if err != nil {
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return err
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}
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if twthread.ID == t.ID {
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break
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}
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}
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kret = C.clear_trap_flag(t.os.threadAct)
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if kret != C.KERN_SUCCESS {
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return fmt.Errorf("could not clear CPU trap flag")
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}
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return nil
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}
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func (t *Thread) resume() error {
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t.running = true
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// TODO(dp) set flag for ptrace stops
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var err error
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t.dbp.execPtraceFunc(func() { err = PtraceCont(t.dbp.Pid, 0) })
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if err == nil {
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return nil
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}
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kret := C.resume_thread(t.os.threadAct)
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if kret != C.KERN_SUCCESS {
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return ErrContinueThread
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}
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return nil
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}
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func (t *Thread) blocked() bool {
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// TODO(dp) cache the func pc to remove this lookup
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pc, err := t.PC()
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if err != nil {
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return false
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}
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fn := t.dbp.goSymTable.PCToFunc(pc)
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if fn == nil {
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return false
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}
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switch fn.Name {
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case "runtime.kevent", "runtime.mach_semaphore_wait", "runtime.usleep":
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return true
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default:
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return false
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}
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}
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func (t *Thread) stopped() bool {
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return C.thread_blocked(t.os.threadAct) > C.int(0)
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}
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func (t *Thread) writeMemory(addr uintptr, data []byte) (int, error) {
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if len(data) == 0 {
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return 0, nil
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}
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var (
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vmData = unsafe.Pointer(&data[0])
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vmAddr = C.mach_vm_address_t(addr)
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length = C.mach_msg_type_number_t(len(data))
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)
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if ret := C.write_memory(t.dbp.os.task, vmAddr, vmData, length); ret < 0 {
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return 0, fmt.Errorf("could not write memory")
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}
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return len(data), nil
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}
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func (t *Thread) readMemory(addr uintptr, size int) ([]byte, error) {
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if size == 0 {
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return nil, nil
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}
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var (
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buf = make([]byte, size)
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vmData = unsafe.Pointer(&buf[0])
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vmAddr = C.mach_vm_address_t(addr)
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length = C.mach_msg_type_number_t(size)
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)
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ret := C.read_memory(t.dbp.os.task, vmAddr, vmData, length)
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if ret < 0 {
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return nil, fmt.Errorf("could not read memory")
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}
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return buf, nil
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}
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