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package native
import (
"fmt"
"syscall"
"unsafe"
sys "golang.org/x/sys/unix"
"github.com/go-delve/delve/pkg/dwarf/op"
"github.com/go-delve/delve/pkg/proc"
"github.com/go-delve/delve/pkg/proc/amd64util"
"github.com/go-delve/delve/pkg/proc/linutil"
)
// SetPC sets RIP to the value specified by 'pc'.
func (thread *nativeThread) setPC(pc uint64) error {
ir, err := registers(thread)
if err != nil {
return err
}
r := ir.(*linutil.AMD64Registers)
r.Regs.Rip = pc
thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, (*sys.PtraceRegs)(r.Regs)) })
return err
}
// SetReg changes the value of the specified register.
func (thread *nativeThread) SetReg(regNum uint64, reg *op.DwarfRegister) error {
ir, err := registers(thread)
if err != nil {
return err
}
r := ir.(*linutil.AMD64Registers)
fpchanged, err := r.SetReg(regNum, reg)
if err != nil {
return err
}
thread.dbp.execPtraceFunc(func() {
err = sys.PtraceSetRegs(thread.ID, (*sys.PtraceRegs)(r.Regs))
if err != nil {
return
}
if fpchanged && r.Fpregset != nil && r.Fpregset.Xsave != nil {
iov := sys.Iovec{Base: &r.Fpregset.Xsave[0], Len: uint64(len(r.Fpregset.Xsave))}
_, _, err = syscall.Syscall6(syscall.SYS_PTRACE, sys.PTRACE_SETREGSET, uintptr(thread.ID), _NT_X86_XSTATE, uintptr(unsafe.Pointer(&iov)), 0, 0)
if err == syscall.Errno(0) {
err = nil
}
}
})
return err
}
func registers(thread *nativeThread) (proc.Registers, error) {
var (
regs linutil.AMD64PtraceRegs
err error
)
thread.dbp.execPtraceFunc(func() { err = sys.PtraceGetRegs(thread.ID, (*sys.PtraceRegs)(®s)) })
if err != nil {
return nil, err
}
r := linutil.NewAMD64Registers(®s, func(r *linutil.AMD64Registers) error {
var fpregset amd64util.AMD64Xstate
var floatLoadError error
r.Fpregs, fpregset, floatLoadError = thread.fpRegisters()
r.Fpregset = &fpregset
return floatLoadError
})
return r, nil
}
const _NT_X86_XSTATE = 0x202
func (thread *nativeThread) fpRegisters() (regs []proc.Register, fpregs amd64util.AMD64Xstate, err error) {
thread.dbp.execPtraceFunc(func() { fpregs, err = ptraceGetRegset(thread.ID) })
regs = fpregs.Decode()
if err != nil {
err = fmt.Errorf("could not get floating point registers: %v", err.Error())
}
return
}
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