github.com/undoio/delve@v1.9.0/pkg/proc/native/registers_linux_amd64.go (about) 1 package native 2 3 import ( 4 "fmt" 5 "syscall" 6 "unsafe" 7 8 sys "golang.org/x/sys/unix" 9 10 "github.com/undoio/delve/pkg/dwarf/op" 11 "github.com/undoio/delve/pkg/proc" 12 "github.com/undoio/delve/pkg/proc/amd64util" 13 "github.com/undoio/delve/pkg/proc/linutil" 14 ) 15 16 // SetPC sets RIP to the value specified by 'pc'. 17 func (thread *nativeThread) setPC(pc uint64) error { 18 ir, err := registers(thread) 19 if err != nil { 20 return err 21 } 22 r := ir.(*linutil.AMD64Registers) 23 r.Regs.Rip = pc 24 thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, (*sys.PtraceRegs)(r.Regs)) }) 25 return err 26 } 27 28 // SetReg changes the value of the specified register. 29 func (thread *nativeThread) SetReg(regNum uint64, reg *op.DwarfRegister) error { 30 ir, err := registers(thread) 31 if err != nil { 32 return err 33 } 34 r := ir.(*linutil.AMD64Registers) 35 fpchanged, err := r.SetReg(regNum, reg) 36 if err != nil { 37 return err 38 } 39 thread.dbp.execPtraceFunc(func() { 40 err = sys.PtraceSetRegs(thread.ID, (*sys.PtraceRegs)(r.Regs)) 41 if err != nil { 42 return 43 } 44 if fpchanged && r.Fpregset != nil && r.Fpregset.Xsave != nil { 45 iov := sys.Iovec{Base: &r.Fpregset.Xsave[0], Len: uint64(len(r.Fpregset.Xsave))} 46 _, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_SETREGSET, uintptr(thread.ID), _NT_X86_XSTATE, uintptr(unsafe.Pointer(&iov)), 0, 0) 47 if err == syscall.Errno(0) { 48 err = nil 49 } 50 } 51 }) 52 return err 53 } 54 55 func registers(thread *nativeThread) (proc.Registers, error) { 56 var ( 57 regs linutil.AMD64PtraceRegs 58 err error 59 ) 60 thread.dbp.execPtraceFunc(func() { err = sys.PtraceGetRegs(thread.ID, (*sys.PtraceRegs)(®s)) }) 61 if err != nil { 62 return nil, err 63 } 64 r := linutil.NewAMD64Registers(®s, func(r *linutil.AMD64Registers) error { 65 var fpregset amd64util.AMD64Xstate 66 var floatLoadError error 67 r.Fpregs, fpregset, floatLoadError = thread.fpRegisters() 68 r.Fpregset = &fpregset 69 return floatLoadError 70 }) 71 return r, nil 72 } 73 74 const _NT_X86_XSTATE = 0x202 75 76 func (thread *nativeThread) fpRegisters() (regs []proc.Register, fpregs amd64util.AMD64Xstate, err error) { 77 thread.dbp.execPtraceFunc(func() { fpregs, err = ptraceGetRegset(thread.ID) }) 78 regs = fpregs.Decode() 79 if err != nil { 80 err = fmt.Errorf("could not get floating point registers: %v", err.Error()) 81 } 82 return 83 }