// by the CPU correctly.
func (r *RegArgs) IntRegArgAddr(reg int, argSize uintptr) unsafe.Pointer {
	if argSize > goarch.PtrSize || argSize == 0 || argSize&(argSize-1) != 0 {
		panic("invalid argSize")
	}
	offset := uintptr(0)
	if goarch.BigEndian {
		offset = goarch.PtrSize - argSize
	}
	return unsafe.Pointer(uintptr(unsafe.Pointer(&r.Ints[reg])) + offset)
}

}

// intFromReg loads an argSize sized integer from reg and places it at to.
//
// argSize must be non-zero, fit in a register, and a power-of-two.
func intFromReg(r *abi.RegArgs, reg int, argSize uintptr, to unsafe.Pointer) {
	memmove(to, r.IntRegArgAddr(reg, argSize), argSize)
}

// intToReg loads an argSize sized integer and stores it into reg.
//
// argSize must be non-zero, fit in a register, and a power-of-two.

#include "textflag.h"
#include "funcdata.h"

// makeFuncStub is the code half of the function returned by MakeFunc.
// See the comment on the declaration of makeFuncStub in makefunc.go
// for more details.
// No argsize here, gc generates argsize info at call site.
TEXT ·makeFuncStub(SB),(NOSPLIT|WRAPPER),$20
	NO_LOCAL_POINTERS
	MOVL	DX, 0(SP)
	LEAL	argframe+0(FP), CX
	MOVL	CX, 4(SP)
	MOVB	$0, 16(SP)
	LEAL	16(SP), AX
	MOVL	AX, 8(SP)

#include "textflag.h"
#include "funcdata.h"

// makeFuncStub is jumped to by the code generated by MakeFunc.
// See the comment on the declaration of makeFuncStub in makefunc.go
// for more details.
// No argsize here, gc generates argsize info at call site.
TEXT ·makeFuncStub(SB),(NOSPLIT|WRAPPER),$20
	NO_LOCAL_POINTERS
	MOVW	R7, 4(R13)
	MOVW	$argframe+0(FP), R1
	MOVW	R1, 8(R13)
	MOVW	$0, R1
	MOVB	R1, 20(R13)
	ADD	$20, R13, R1

	}
	argp := a.data
	var argSize uintptr
	if argp != nil {
		argSize = (*ptrtype)(unsafe.Pointer(a._type)).Elem.Size_
	}

	h := new(debugCallHandler)
	h.gp = gp
	// gp may not be running right now, but we can still get the M
	// it will run on since it's locked.
	h.mp = gp.lockedm.ptr()
	h.fv, h.regArgs, h.argp, h.argSize = fv, regArgs, argp, argSize

	// Write the argument frame size.
	*(*uintptr)(unsafe.Pointer(uintptr(sp - 16))) = h.argSize
	// Save current registers.
	h.sigCtxt.savedRegs = *ctxt.regs()
}

// case 0
func (h *debugCallHandler) debugCallRun(ctxt *sigctxt) {
	sp := ctxt.sp()
	memmove(unsafe.Pointer(uintptr(sp)+8), h.argp, h.argSize)
	if h.regArgs != nil {
		storeRegArgs(ctxt.regs(), h.regArgs)
	}

	// Write the argument frame size.
	*(*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)
	}

	*(*uintptr)(unsafe.Pointer(uintptr(rsp - 16))) = h.argSize
	// Save current registers.
	h.sigCtxt.savedRegs = *ctxt.regs()
	h.sigCtxt.savedFP = *h.sigCtxt.savedRegs.fpstate
	h.sigCtxt.savedRegs.fpstate = nil
}

// case 0
func (h *debugCallHandler) debugCallRun(ctxt *sigctxt) {
	rsp := ctxt.rsp()
	memmove(unsafe.Pointer(uintptr(rsp)), h.argp, h.argSize)
	if h.regArgs != nil {
		storeRegArgs(ctxt.regs(), h.regArgs)
	}

func FuncLayout(t Type, rcvr Type) (frametype Type, argSize, retOffset uintptr, stack, gc, inReg, outReg []byte, ptrs bool) {
	var ft *abi.Type
	var abid abiDesc
	if rcvr != nil {
		ft, _, abid = funcLayout((*funcType)(unsafe.Pointer(t.common())), rcvr.common())
	} else {
		ft, _, abid = funcLayout((*funcType)(unsafe.Pointer(t.(*rtype))), nil)
	}
	// Extract size information.
	argSize = abid.stackCallArgsSize
	retOffset = abid.retOffset

		{name: "LoweredTailCall", argLength: 1, reg: regInfo{clobbers: callerSave}, aux: "CallOff", call: true, tailCall: true},                  // tail call static function aux.(*obj.LSym). arg0=mem, auxint=argsize, returns mem