e4fc5e32c2
Previously either the terminal client or the debugger service would either lock main goroutine to a thread or provide a locked goroutine to run _all_ DebuggedProcess functions in. This is unnecessary because only ptrace functions need to be run from the same thread that originated the PT_ATTACH request. Here we use a specific thread-locked goroutine to service any ptrace request. That goroutine is also responsible for the initial spawning / attaching of the process, since it must be responsible for the PT_ATTACH request.
83 lines
1.9 KiB
Go
83 lines
1.9 KiB
Go
package proc
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import (
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"fmt"
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sys "golang.org/x/sys/unix"
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)
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// Not actually used, but necessary
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// to be defined.
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type OSSpecificDetails struct {
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registers sys.PtraceRegs
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}
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func (t *Thread) Halt() error {
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if stopped(t.Id) {
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return nil
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}
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err := sys.Tgkill(t.dbp.Pid, t.Id, sys.SIGSTOP)
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if err != nil {
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return fmt.Errorf("Halt err %s %d", err, t.Id)
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}
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_, _, err = wait(t.Id, 0)
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if err != nil {
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return fmt.Errorf("wait err %s %d", err, t.Id)
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}
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return nil
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}
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func (t *Thread) resume() (err error) {
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t.dbp.execPtraceFunc(func() { err = PtraceCont(t.Id, 0) })
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return
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}
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func (t *Thread) singleStep() (err error) {
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t.dbp.execPtraceFunc(func() { err = sys.PtraceSingleStep(t.Id) })
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if err != nil {
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return err
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}
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_, _, err = wait(t.Id, 0)
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return err
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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, _ := t.PC()
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fn := t.dbp.goSymTable.PCToFunc(pc)
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if fn != nil && ((fn.Name == "runtime.futex") || (fn.Name == "runtime.usleep") || (fn.Name == "runtime.clone")) {
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return true
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}
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return false
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}
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func (thread *Thread) saveRegisters() (Registers, error) {
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var err error
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thread.dbp.execPtraceFunc(func() { err = sys.PtraceGetRegs(thread.Id, &thread.os.registers) })
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if err != nil {
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return nil, fmt.Errorf("could not save register contents")
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}
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return &Regs{&thread.os.registers}, nil
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}
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func (thread *Thread) restoreRegisters() (err error) {
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thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.Id, &thread.os.registers) })
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return
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}
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func writeMemory(thread *Thread, addr uintptr, data []byte) (written int, err error) {
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if len(data) == 0 {
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return
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}
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thread.dbp.execPtraceFunc(func() { written, err = sys.PtracePokeData(thread.Id, addr, data) })
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return
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}
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func readMemory(thread *Thread, addr uintptr, data []byte) (read int, err error) {
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if len(data) == 0 {
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return
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}
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thread.dbp.execPtraceFunc(func() { read, err = sys.PtracePeekData(thread.Id, addr, data) })
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return
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}
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