package runtime

import (
	"internal/abi"
	"internal/goarch"
	"unsafe"
)

type sigContext struct {
	savedRegs sigcontext
}

func sigctxtSetContextRegister(ctxt *sigctxt, x uint64) {
	ctxt.regs().regs[26] = x
}

func sigctxtAtTrapInstruction(ctxt *sigctxt) bool {
	return *(*uint32)(unsafe.Pointer(ctxt.sigpc())) == 0xd4200000 // BRK 0
}

func sigctxtStatus(ctxt *sigctxt) uint64 {
	return ctxt.r20()
}

func (c *sigctxt) rsi() uint64 { return uint64(c.regs().gregs[_REG_RSI]) }
func (c *sigctxt) rbp() uint64 { return uint64(c.regs().gregs[_REG_RBP]) }
func (c *sigctxt) rsp() uint64 { return uint64(c.regs().gregs[_REG_RSP]) }
func (c *sigctxt) r8() uint64  { return uint64(c.regs().gregs[_REG_R8]) }
func (c *sigctxt) r9() uint64  { return uint64(c.regs().gregs[_REG_R9]) }

func (c *sigctxt) r5() uint64   { return c.regs().gregs[5] }
func (c *sigctxt) r6() uint64   { return c.regs().gregs[6] }
func (c *sigctxt) r7() uint64   { return c.regs().gregs[7] }
func (c *sigctxt) r8() uint64   { return c.regs().gregs[8] }
func (c *sigctxt) r9() uint64   { return c.regs().gregs[9] }
func (c *sigctxt) r10() uint64  { return c.regs().gregs[10] }
func (c *sigctxt) r11() uint64  { return c.regs().gregs[11] }

	v_regs      *vreg
	vmx_reserve [101]int64
}

type ucontext struct {
	uc_flags    uint64
	uc_link     *ucontext
	uc_stack    stackt
	uc_sigmask  uint64
	__unused    [15]uint64
	uc_mcontext sigcontext

	v_regs      *vreg
	vmx_reserve [101]int64
}

type ucontext struct {
	uc_flags    uint64
	uc_link     *ucontext
	uc_stack    stackt
	uc_sigmask  uint64
	__unused    [15]uint64
	uc_mcontext sigcontext

type PtraceRegsArm struct {
	Uregs [18]uint32
}

// PtraceGetRegsArm fetches the registers used by arm binaries.
func PtraceGetRegsArm(pid int, regsout *PtraceRegsArm) error {
	return ptracePtr(PTRACE_GETREGS, pid, 0, unsafe.Pointer(regsout))
}

// PtraceSetRegsArm sets the registers used by arm binaries.
func PtraceSetRegsArm(pid int, regs *PtraceRegsArm) error {

func (c *sigctxt) r5() uint64  { return c.regs().gpr[5] }
func (c *sigctxt) r6() uint64  { return c.regs().gpr[6] }
func (c *sigctxt) r7() uint64  { return c.regs().gpr[7] }
func (c *sigctxt) r8() uint64  { return c.regs().gpr[8] }
func (c *sigctxt) r9() uint64  { return c.regs().gpr[9] }
func (c *sigctxt) r10() uint64 { return c.regs().gpr[10] }
func (c *sigctxt) r11() uint64 { return c.regs().gpr[11] }

	stackBytes   uintptr // stack space used
	iregs, fregs int     // registers used
}

func (a *abiSeq) dump() {
	for i, p := range a.steps {
		println("part", i, p.kind, p.offset, p.size, p.stkOff, p.ireg, p.freg)
	}
	print("values ")
	for _, i := range a.valueStart {
		print(i, " ")
	}
	println()
	println("stack", a.stackBytes)
	println("iregs", a.iregs)
	println("fregs", a.fregs)
}

	*(*uintptr)(unsafe.Pointer(uintptr(sp - 32))) = h.argSize
	// Save current registers.
	h.sigCtxt.savedRegs = *ctxt.cregs()
}

// case 0
func (h *debugCallHandler) debugCallRun(ctxt *sigctxt) {
	sp := ctxt.sp()
	memmove(unsafe.Pointer(uintptr(sp)+32), h.argp, h.argSize)
	if h.regArgs != nil {
		storeRegArgs(ctxt.cregs(), h.regArgs)
	}
	// Push return PC, which should be the signal PC+4, because

	}
	regs := "<none>"
	if c.regValues != nil {
		regs = ""
		for i, x := range *c.regValues {
			if i > 0 {
				regs = regs + "; "
			}
			regs = regs + x.LongString()
		}
	}

	// not printing the config because that has not been useful
	return fmt.Sprintf("RCSR{storeDest=%v, regsLen=%d, nextSlice=%d, regValues=[%s]}", dest, len(c.regs), c.nextSlice, regs)
}