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package native
import (
"fmt"
sys "golang.org/x/sys/unix"
"github.com/go-delve/delve/pkg/dwarf/op"
"github.com/go-delve/delve/pkg/dwarf/regnum"
"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 EIP 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.I386Registers)
r.Regs.Eip = int32(pc)
thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, (*sys.PtraceRegs)(r.Regs)) })
return err
}
func (thread *nativeThread) SetReg(regNum uint64, reg *op.DwarfRegister) error {
ir, err := registers(thread)
if err != nil {
return err
}
r := ir.(*linutil.I386Registers)
switch regNum {
case regnum.I386_Eip:
r.Regs.Eip = int32(reg.Uint64Val)
case regnum.I386_Esp:
r.Regs.Esp = int32(reg.Uint64Val)
case regnum.I386_Edx:
r.Regs.Edx = int32(reg.Uint64Val)
default:
//TODO(aarzilli): when the register calling convention is adopted by Go on
// i386 this should be implemented.
return fmt.Errorf("changing register %d not implemented", regNum)
}
thread.dbp.execPtraceFunc(func() { err = sys.PtraceSetRegs(thread.ID, (*sys.PtraceRegs)(r.Regs)) })
return err
}
func registers(thread *nativeThread) (proc.Registers, error) {
var (
regs linutil.I386PtraceRegs
err error
)
thread.dbp.execPtraceFunc(func() { err = sys.PtraceGetRegs(thread.ID, (*sys.PtraceRegs)(®s)) })
if err != nil {
return nil, err
}
r := linutil.NewI386Registers(®s, func(r *linutil.I386Registers) error {
var fpregset amd64util.AMD64Xstate
var floatLoadError error
r.Fpregs, fpregset, floatLoadError = thread.fpRegisters()
r.Fpregset = &fpregset
return floatLoadError
})
thread.dbp.execPtraceFunc(func() {
tls, _ := ptraceGetTls(regs.Xgs, thread.ThreadID())
r.Tls = uint64(tls)
})
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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