// https://openpowerfoundation.org/?resource_lib=64-bit-elf-v2-abi-specification-power-architecture
var PPC64DWARFRegisters = map[int16]int16{}

func init() {
	// f assigns dwarfregister[from:to] = (base):(to-from+base)
	f := func(from, to, base int16) {
		for r := int16(from); r <= to; r++ {
			PPC64DWARFRegisters[r] = r - from + base
		}
	}
	f(REG_R0, REG_R31, 0)
	f(REG_F0, REG_F31, 32)

	REGG    = REG_R22 // G in loong64
	REGTMP  = REG_R30 // used by the assembler
	FREGRET = REG_F0  // not use
)

var LOONG64DWARFRegisters = map[int16]int16{}

func init() {
	// f assigns dwarfregisters[from:to] = (base):(to-from+base)
	f := func(from, to, base int16) {
		for r := int16(from); r <= to; r++ {
			LOONG64DWARFRegisters[r] = (r - from) + base
		}
	}
	f(REG_R0, REG_R31, 0)

	FREGEXT = REG_F7
	FREGTMP = REG_F15
)

// http://infocenter.arm.com/help/topic/com.arm.doc.ihi0040b/IHI0040B_aadwarf.pdf
var ARMDWARFRegisters = map[int16]int16{}

func init() {
	// f assigns dwarfregisters[from:to] = (base):(step*(to-from)+base)
	f := func(from, to, base, step int16) {
		for r := int16(from); r <= to; r++ {
			ARMDWARFRegisters[r] = step*(r-from) + base
		}
	}
	f(REG_R0, REG_R15, 0, 1)

	Preprocess:     preprocess,
	Assemble:       span0,
	Progedit:       progedit,
	DWARFRegisters: MIPSDWARFRegisters,
}

var Linkmips64le = obj.LinkArch{
	Arch:           sys.ArchMIPS64LE,
	Init:           buildop,
	Preprocess:     preprocess,
	Assemble:       span0,
	Progedit:       progedit,
	DWARFRegisters: MIPSDWARFRegisters,
}

var Linkmips = obj.LinkArch{
	Arch:           sys.ArchMIPS,

// For now, this is adequate for both 32 and 64 bit.
var MIPSDWARFRegisters = map[int16]int16{}

func init() {
	// f assigns dwarfregisters[from:to] = (base):(to-from+base)
	f := func(from, to, base int16) {
		for r := int16(from); r <= to; r++ {
			MIPSDWARFRegisters[r] = (r - from) + base
		}
	}
	f(REG_R0, REG_R31, 0)

// LINUX for zSeries ELF Application Binary Interface Supplement
// https://refspecs.linuxfoundation.org/ELF/zSeries/lzsabi0_zSeries/x1472.html
var S390XDWARFRegisters = map[int16]int16{}

func init() {
	// f assigns dwarfregisters[from:to by step] = (base):((to-from)/step+base)
	f := func(from, step, to, base int16) {
		for r := int16(from); r <= to; r += step {
			S390XDWARFRegisters[r] = (r-from)/step + base
		}
	}

	SEH:            populateSeh,
	UnaryDst:       unaryDst,
	DWARFRegisters: AMD64DWARFRegisters,
}

var Link386 = obj.LinkArch{
	Arch:           sys.Arch386,
	Init:           instinit,
	Preprocess:     preprocess,
	Assemble:       span6,
	Progedit:       progedit,
	UnaryDst:       unaryDst,
	DWARFRegisters: X86DWARFRegisters,

}

var Linkarm = obj.LinkArch{
	Arch:           sys.ArchARM,
	Init:           buildop,
	Preprocess:     preprocess,
	Assemble:       span5,
	Progedit:       progedit,
	UnaryDst:       unaryDst,
	DWARFRegisters: ARMDWARFRegisters,

	Progedit:       progedit,
	UnaryDst:       unaryDst,
	DWARFRegisters: PPC64DWARFRegisters,
}

var Linkppc64le = obj.LinkArch{
	Arch:           sys.ArchPPC64LE,
	Init:           buildop,
	Preprocess:     preprocess,
	Assemble:       span9,
	Progedit:       progedit,
	UnaryDst:       unaryDst,
	DWARFRegisters: PPC64DWARFRegisters,

	p.Link = q
}

var Linkloong64 = obj.LinkArch{
	Arch:           sys.ArchLoong64,
	Init:           buildop,
	Preprocess:     preprocess,
	Assemble:       span0,
	Progedit:       progedit,
	DWARFRegisters: LOONG64DWARFRegisters,