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package native
import (
"bytes"
sys "golang.org/x/sys/unix"
"github.com/go-delve/delve/pkg/proc"
"github.com/go-delve/delve/pkg/proc/amd64util"
"github.com/go-delve/delve/pkg/proc/fbsdutil"
)
type waitStatus sys.WaitStatus
// osSpecificDetails hold FreeBSD specific process details.
type osSpecificDetails struct {
registers sys.Reg
}
func (procgrp *processGroup) singleStep(t *nativeThread) (err error) {
t.dbp.execPtraceFunc(func() { err = ptraceSetStep(t.ID) })
if err != nil {
return err
}
defer func() {
t.dbp.execPtraceFunc(func() { ptraceClearStep(t.ID) })
}()
t.dbp.execPtraceFunc(func() { err = ptraceResume(t.ID) })
if err != nil {
return err
}
defer func() {
t.dbp.execPtraceFunc(func() { ptraceSuspend(t.ID) })
}()
sig := 0
for {
err = t.dbp.ptraceCont(sig)
sig = 0
if err != nil {
return err
}
trapthread, err := t.dbp.trapWaitInternal(-1, trapWaitStepping)
if err != nil {
return err
}
status := ((*sys.WaitStatus)(trapthread.Status))
if trapthread.ID == t.ID {
switch s := status.StopSignal(); s {
case sys.SIGTRAP:
return nil
case sys.SIGSTOP:
// delayed SIGSTOP, ignore it
case sys.SIGILL, sys.SIGBUS, sys.SIGFPE, sys.SIGSEGV:
// propagate signals that can be caused by current instruction
sig = int(s)
default:
t.dbp.os.delayedSignal = s
}
} else {
if status.StopSignal() == sys.SIGTRAP {
t.dbp.os.trapThreads = append(t.dbp.os.trapThreads, trapthread.ID)
} else {
t.dbp.os.delayedSignal = status.StopSignal()
}
}
}
}
func (t *nativeThread) restoreRegisters(savedRegs proc.Registers) error {
sr := savedRegs.(*fbsdutil.AMD64Registers)
return setRegisters(t, sr, true)
}
func (t *nativeThread) WriteMemory(addr uint64, data []byte) (written int, err error) {
if ok, err := t.dbp.Valid(); !ok {
return 0, err
}
if len(data) == 0 {
return 0, nil
}
t.dbp.execPtraceFunc(func() { written, err = ptraceWriteData(t.ID, uintptr(addr), data) })
return written, err
}
func (t *nativeThread) ReadMemory(data []byte, addr uint64) (n int, err error) {
if ok, err := t.dbp.Valid(); !ok {
return 0, err
}
if len(data) == 0 {
return 0, nil
}
t.dbp.execPtraceFunc(func() { n, err = ptraceReadData(t.ID, uintptr(addr), data) })
return n, err
}
func (t *nativeThread) withDebugRegisters(f func(*amd64util.DebugRegisters) error) error {
return proc.ErrHWBreakUnsupported
}
// SoftExc returns true if this thread received a software exception during the last resume.
func (t *nativeThread) SoftExc() bool {
return false
}
func (t *nativeThread) atHardcodedBreakpoint(pc uint64) bool {
for _, bpinstr := range [][]byte{
t.dbp.BinInfo().Arch.BreakpointInstruction(),
t.dbp.BinInfo().Arch.AltBreakpointInstruction()} {
if bpinstr == nil {
continue
}
buf := make([]byte, len(bpinstr))
_, _ = t.ReadMemory(buf, pc-uint64(len(buf)))
if bytes.Equal(buf, bpinstr) {
return true
}
}
return false
}
|
