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)(&regs)) })
    61  	if err != nil {
    62  		return nil, err
    63  	}
    64  	r := linutil.NewAMD64Registers(&regs, 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  }