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bee/vendor/github.com/derekparker/delve/proc/threads_linux.go
2017-03-26 16:55:28 +02:00

109 lines
2.4 KiB
Go

package proc
import (
"fmt"
sys "golang.org/x/sys/unix"
)
type WaitStatus sys.WaitStatus
// OSSpecificDetails hold Linux specific
// process details.
type OSSpecificDetails struct {
registers sys.PtraceRegs
}
func (t *Thread) halt() (err error) {
err = sys.Tgkill(t.dbp.Pid, t.ID, sys.SIGSTOP)
if err != nil {
err = fmt.Errorf("halt err %s on thread %d", err, t.ID)
return
}
_, _, err = t.dbp.wait(t.ID, 0)
if err != nil {
err = fmt.Errorf("wait err %s on thread %d", err, t.ID)
return
}
return
}
func (t *Thread) stopped() bool {
state := status(t.ID, t.dbp.os.comm)
return state == StatusTraceStop || state == StatusTraceStopT
}
func (t *Thread) resume() error {
return t.resumeWithSig(0)
}
func (t *Thread) resumeWithSig(sig int) (err error) {
t.running = true
t.dbp.execPtraceFunc(func() { err = PtraceCont(t.ID, sig) })
return
}
func (t *Thread) singleStep() (err error) {
for {
t.dbp.execPtraceFunc(func() { err = sys.PtraceSingleStep(t.ID) })
if err != nil {
return err
}
wpid, status, err := t.dbp.wait(t.ID, 0)
if err != nil {
return err
}
if (status == nil || status.Exited()) && wpid == t.dbp.Pid {
t.dbp.postExit()
rs := 0
if status != nil {
rs = status.ExitStatus()
}
return ProcessExitedError{Pid: t.dbp.Pid, Status: rs}
}
if wpid == t.ID && status.StopSignal() == sys.SIGTRAP {
return nil
}
}
}
func (t *Thread) blocked() bool {
pc, _ := t.PC()
fn := t.dbp.goSymTable.PCToFunc(pc)
if fn != nil && ((fn.Name == "runtime.futex") || (fn.Name == "runtime.usleep") || (fn.Name == "runtime.clone")) {
return true
}
return false
}
func (t *Thread) saveRegisters() (Registers, error) {
var err error
t.dbp.execPtraceFunc(func() { err = sys.PtraceGetRegs(t.ID, &t.os.registers) })
if err != nil {
return nil, fmt.Errorf("could not save register contents")
}
return &Regs{&t.os.registers, nil}, nil
}
func (t *Thread) restoreRegisters() (err error) {
t.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(t.ID, &t.os.registers) })
return
}
func (t *Thread) writeMemory(addr uintptr, data []byte) (written int, err error) {
if len(data) == 0 {
return
}
t.dbp.execPtraceFunc(func() { written, err = sys.PtracePokeData(t.ID, addr, data) })
return
}
func (t *Thread) readMemory(addr uintptr, size int) (data []byte, err error) {
if size == 0 {
return
}
data = make([]byte, size)
t.dbp.execPtraceFunc(func() { _, err = sys.PtracePeekData(t.ID, addr, data) })
return
}