//go:build linux && (mips || mips64)

package unix

import "unsafe"

// PtraceRegsMips is the registers used by mips binaries.
type PtraceRegsMips struct {
	Regs     [32]uint64
	Lo       uint64
	Hi       uint64
	Epc      uint64
	Badvaddr uint64
	Status   uint64
	Cause    uint64
}

// PtraceGetRegsMips fetches the registers used by mips binaries.
func PtraceGetRegsMips(pid int, regsout *PtraceRegsMips) error {

	VPGATHERQQ Y2, (BP)(X2*2), Y2   // ERROR "mask, index, and destination registers should be distinct"
	VPGATHERQQ Y2, (BP)(X2*2), Y7   // ERROR "mask, index, and destination registers should be distinct"
	VPGATHERQQ Y2, (BP)(X7*2), Y2   // ERROR "mask, index, and destination registers should be distinct"
	VPGATHERQQ Y7, (BP)(X2*2), Y2   // ERROR "mask, index, and destination registers should be distinct"

package unix

import "unsafe"

// PtraceRegsArm is the registers used by arm binaries.
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.

//go:build linux && (mipsle || mips64le)

package unix

import "unsafe"

// PtraceRegsMipsle is the registers used by mipsle binaries.
type PtraceRegsMipsle struct {
	Regs     [32]uint64
	Lo       uint64
	Hi       uint64
	Epc      uint64
	Badvaddr uint64
	Status   uint64
	Cause    uint64
}

// PtraceGetRegsMipsle fetches the registers used by mipsle binaries.
func PtraceGetRegsMipsle(pid int, regsout *PtraceRegsMipsle) error {

	// IntArgRegs is the number of registers dedicated
	// to passing integer argument values. Result registers are identical
	// to argument registers, so this number is used for those too.
	IntArgRegs = 0

	// FloatArgRegs is the number of registers dedicated
	// to passing floating-point argument values. Result registers are
	// identical to argument registers, so this number is used for
	// those too.
	FloatArgRegs = 0

	Xcs      int32
	Eflags   int32
	Esp      int32
	Xss      int32
}

// PtraceGetRegs386 fetches the registers used by 386 binaries.
func PtraceGetRegs386(pid int, regsout *PtraceRegs386) error {
	return ptracePtr(PTRACE_GETREGS, pid, 0, unsafe.Pointer(regsout))
}

// PtraceSetRegs386 sets the registers used by 386 binaries.
func PtraceSetRegs386(pid int, regs *PtraceRegs386) error {

	/* save callee-saved floating point registers */
	std     %f8, 0(%r15)
	std     %f9, 8(%r15)
	std     %f10, 16(%r15)
	std     %f11, 24(%r15)
	std     %f12, 32(%r15)
	std     %f13, 40(%r15)
	std     %f14, 48(%r15)
	std     %f15, 56(%r15)

	/* restore g pointer */
	lgr     %r13, %r3

	/* call fn */
	basr    %r14, %r2

	/* restore floating point registers */
	ld      %f8, 0(%r15)
	ld      %f9, 8(%r15)

//go:generate go run ../stringer.go -i $GOFILE -o anames.go -p mips

/*
 * mips 64
 */
const (
	NSNAME = 8
	NSYM   = 50
	NREG   = 32 /* number of general registers */
	NFREG  = 32 /* number of floating point registers */
	NWREG  = 32 /* number of MSA registers */
)

const (
	REG_R0 = obj.RBaseMIPS + iota // must be a multiple of 32
	REG_R1
	REG_R2
	REG_R3
	REG_R4
	REG_R5
	REG_R6
	REG_R7
	REG_R8

	ctxt.set_pc(ctxt.pc() + 4)
}

// case 16
func (h *debugCallHandler) restoreSigContext(ctxt *sigctxt) {
	// Restore all registers except for pc and sp
	pc, sp := ctxt.pc(), ctxt.sp()
	*ctxt.cregs() = h.sigCtxt.savedRegs
	ctxt.set_pc(pc + 4)
	ctxt.set_sp(sp)
}

// storeRegArgs sets up argument registers in the signal
// context state from an abi.RegArgs.
//
// Both src and dst must be non-nil.

// Saves C callee-saved registers and calls cgocallback with three arguments.
// fn is the PC of a func(a unsafe.Pointer) function.
TEXT crosscall2(SB),NOSPLIT|NOFRAME,$0
	SUB	$(8*9), R13 // Reserve space for the floating point registers.
	// The C arguments arrive in R0, R1, R2, and R3. We want to
	// pass R0, R1, and R3 to Go, so we push those on the stack.
	// Also, save C callee-save registers R4-R12.