105 lines
2.4 KiB
Go
105 lines
2.4 KiB
Go
package native
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import (
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"debug/elf"
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"syscall"
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"unsafe"
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"github.com/go-delve/delve/pkg/dwarf/op"
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"github.com/go-delve/delve/pkg/dwarf/regnum"
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"github.com/go-delve/delve/pkg/proc"
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"github.com/go-delve/delve/pkg/proc/linutil"
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sys "golang.org/x/sys/unix"
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)
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const (
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_PPC64LE_GPREGS_SIZE = 44 * 8
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_PPC64LE_FPREGS_SIZE = 33*8 + 8
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)
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func ptraceGetGRegs(pid int, regs *linutil.PPC64LEPtraceRegs) (err error) {
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sys.PtraceGetRegs(pid, (*sys.PtraceRegs)(regs))
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if err == syscall.Errno(0) {
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err = nil
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}
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return
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}
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func ptraceSetGRegs(pid int, regs *linutil.PPC64LEPtraceRegs) (err error) {
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sys.PtraceSetRegs(pid, (*sys.PtraceRegs)(regs))
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if err == syscall.Errno(0) {
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err = nil
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}
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return
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}
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func ptraceGetFpRegset(tid int) (fpregset []byte, err error) {
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var ppc64leFpregs [_PPC64LE_FPREGS_SIZE]byte
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iov := sys.Iovec{Base: &ppc64leFpregs[0], Len: _PPC64LE_FPREGS_SIZE}
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_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_GETREGSET, uintptr(tid), uintptr(elf.NT_FPREGSET), uintptr(unsafe.Pointer(&iov)), 0, 0)
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if err != syscall.Errno(0) {
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if err == syscall.ENODEV {
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err = nil
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}
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return
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} else {
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err = nil
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}
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fpregset = ppc64leFpregs[:iov.Len-8]
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return fpregset, err
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}
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// SetPC sets PC to the value specified by 'pc'.
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func (t *nativeThread) setPC(pc uint64) error {
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ir, err := registers(t)
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if err != nil {
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return err
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}
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r := ir.(*linutil.PPC64LERegisters)
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r.Regs.Nip = pc
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t.dbp.execPtraceFunc(func() { err = ptraceSetGRegs(t.ID, r.Regs) })
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return err
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}
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// SetReg changes the value of the specified register.
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func (t *nativeThread) SetReg(regNum uint64, reg *op.DwarfRegister) error {
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ir, err := registers(t)
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if err != nil {
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return err
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}
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r := ir.(*linutil.PPC64LERegisters)
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switch regNum {
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case regnum.PPC64LE_PC:
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r.Regs.Nip = reg.Uint64Val
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case regnum.PPC64LE_SP:
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r.Regs.Gpr[1] = reg.Uint64Val
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case regnum.PPC64LE_LR:
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r.Regs.Link = reg.Uint64Val
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default:
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panic("SetReg")
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}
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t.dbp.execPtraceFunc(func() { err = ptraceSetGRegs(t.ID, r.Regs) })
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return err
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}
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func registers(thread *nativeThread) (proc.Registers, error) {
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var (
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regs linutil.PPC64LEPtraceRegs
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err error
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)
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thread.dbp.execPtraceFunc(func() { err = ptraceGetGRegs(thread.ID, ®s) })
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if err != nil {
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return nil, err
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}
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r := linutil.NewPPC64LERegisters(®s, func(r *linutil.PPC64LERegisters) error {
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var floatLoadError error
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r.Fpregs, r.Fpregset, floatLoadError = thread.fpRegisters()
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return floatLoadError
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})
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return r, nil
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}
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