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How to use isPrefixed method of powerpc Package

Best Syzkaller code snippet using powerpc.isPrefixed

powerpc.go

Source:powerpc.go

...46	prefixShift  = 32 - 647	prefixMask   = uint32(0x3f) << prefixShift48	prefixOpcode = uint32(1) << prefixShift49)50func (insn Insn) isPrefixed() bool {51	return insn.Opcode&prefixMask == prefixOpcode52}53func (insnset *InsnSet) GetInsns(mode iset.Mode, typ iset.Type) []iset.Insn {54	return insnset.modeInsns[mode][typ]55}56func (insnset *InsnSet) Decode(mode iset.Mode, text []byte) (int, error) {57	if len(text) < 4 {58		return 0, errors.New("must be at least 4 bytes")59	}60	insn32 := binary.LittleEndian.Uint32(text)61	if insn32&prefixMask == prefixOpcode {62		insn2 := uint32(0)63		for _, ins := range insnset.Insns {64			if !ins.isPrefixed() || ins.Mask&insn32 != ins.Opcode {65				continue66			}67			if len(text) < 8 {68				return 0, errors.New("prefixed instruction must be at least 8 bytes")69			}70			insn2 = binary.LittleEndian.Uint32(text[4:])71			for _, ins := range insnset.Insns {72				if !ins.isPrefixed() {73					continue74				}75				if ins.MaskSuffix&insn2 == ins.OpcodeSuffix {76					return 8, nil77				}78			}79			break80		}81		return 0, fmt.Errorf("unrecognised prefixed instruction %08x %08x", insn32, insn2)82	}83	for _, ins := range insnset.Insns {84		if ins.Mask&insn32 == ins.Opcode {85			return 4, nil86		}87	}88	return 0, fmt.Errorf("unrecognised instruction %08x", insn32)89}90func (insnset *InsnSet) DecodeExt(mode iset.Mode, text []byte) (int, error) {91	return 0, fmt.Errorf("no external decoder")92}93func encodeBits(n uint, ff []InsnBits) uint32 {94	ret := uint32(0)95	for _, f := range ff {96		mask := uint(1<<f.Length) - 197		field := uint32((n & mask) << (31 - (f.Start + f.Length - 1)))98		ret = ret | field99		n = n >> f.Length100	}101	return ret102}103func (insn Insn) Encode(cfg *iset.Config, r *rand.Rand) []byte {104	if insn.Pseudo {105		return insn.generator(cfg, r)106	}107	ret := make([]byte, 0)108	ret = append(ret, insn.encodeOpcode(cfg, r, insn.Opcode, insn.Mask, insn.Fields)...)109	if insn.isPrefixed() {110		ret = append(ret, insn.encodeOpcode(cfg, r, insn.OpcodeSuffix, insn.MaskSuffix, insn.FieldsSuffix)...)111	}112	return ret113}114func (insn Insn) encodeOpcode(cfg *iset.Config, r *rand.Rand, opcode, mask uint32, f []InsnField) []byte {115	ret := make([]byte, 0)116	insn32 := opcode117	if len(cfg.MemRegions) != 0 {118		// The PowerISA pdf parser could have missed some fields,119		// randomize them there.120		insn32 |= r.Uint32() & ^mask121	}122	for _, f := range f {123		field := uint(r.Intn(1 << 16))124		if f.Name == "Ap" || f.Name == "FRAp" || f.Name == "FRBp" || f.Name == "FRTp" || f.Name == "FRSp" {125			// These are pairs and have to be even numbers.126			field &^= 1127		}128		insn32 |= encodeBits(field, f.Bits)129		if len(cfg.MemRegions) != 0 && (f.Name == "RA" || f.Name == "RB" || f.Name == "RS") {130			val := iset.GenerateInt(cfg, r, 8)131			ret = append(ret, insn.insnMap.ld64(field, val)...)132		}133	}134	return append(ret, uint32toBytes(insn32)...)135}136func Register(insns []*Insn) {137	if len(insns) == 0 {138		panic("no instructions")139	}140	insnset := &InsnSet{141		Insns:   insns,142		insnMap: make(map[string]*Insn),143	}144	for _, insn := range insnset.Insns {145		insnset.insnMap[insn.Name] = insn146		insn.insnMap = &insnset.insnMap147	}148	insnset.initPseudo()149	for _, insn := range insnset.Insns {150		insnset.modeInsns.Add(insn)151	}152	iset.Arches[iset.ArchPowerPC] = insnset153}154func (insn *Insn) Info() (string, iset.Mode, bool, bool) {155	return insn.Name, insn.mode(), insn.Pseudo, insn.Priv156}157func (insn Insn) mode() iset.Mode {158	return (1 << iset.ModeLong64) | (1 << iset.ModeProt32)159}160func uint32toBytes(v uint32) []byte {161	ret := make([]byte, 4)162	binary.LittleEndian.PutUint32(ret, v)163	return ret164}165func (insn *Insn) enc(v map[string]uint) []byte {166	ret := make([]byte, 0)167	ret = append(ret, insn.encOpcode(v, insn.Opcode, insn.Fields)...)168	if insn.isPrefixed() {169		ret = append(ret, insn.encOpcode(v, insn.OpcodeSuffix, insn.FieldsSuffix)...)170	}171	return ret172}173func (insn *Insn) encOpcode(v map[string]uint, opcode uint32, f []InsnField) []byte {174	insn32 := opcode175	for _, f := range insn.Fields {176		if val, ok := v[f.Name]; ok {177			insn32 |= encodeBits(val, f.Bits)178		}179	}180	return uint32toBytes(insn32)181}182func (imap insnSetMap) ld64(reg uint, v uint64) []byte {...

isPrefixed

Using AI Code Generation

1import (2func main() {3	fmt.Println("Hello, playground")4	bus := gobus.NewBus()5	bus.AddDevice("powerpc", "0x0", "0x1000")6	bus.AddDevice("powerpc", "0x1000", "0x1000")7	bus.AddDevice("powerpc", "0x2000", "0x1000")8	bus.AddDevice("powerpc", "0x3000", "0x1000")9	bus.AddDevice("powerpc", "0x4000", "0x1000")10	bus.AddDevice("powerpc", "0x5000", "0x1000")11	bus.AddDevice("powerpc", "0x6000", "0x1000")12	bus.AddDevice("powerpc", "0x7000", "0x1000")13	bus.AddDevice("powerpc", "0x8000", "0x1000")14	bus.AddDevice("powerpc", "0x9000", "0x1000")15	bus.AddDevice("powerpc", "0xa000", "0x1000")16	bus.AddDevice("powerpc", "0xb000", "0x1000")17	bus.AddDevice("powerpc", "0xc000", "0x1000")18	bus.AddDevice("powerpc", "0xd000", "0x1000")19	bus.AddDevice("powerpc", "0xe000", "0x1000")20	bus.AddDevice("powerpc", "0xf000", "0x1000")21	bus.AddDevice("powerpc", "0x10000", "0x1000")22	bus.AddDevice("powerpc", "0x11000", "0x1000")23	bus.AddDevice("powerpc", "0x12000", "0x1000")24	bus.AddDevice("powerpc", "0x13000", "0x1000")25	bus.AddDevice("powerpc", "0x14000", "0x1000")26	bus.AddDevice("powerpc", "0x15000", "0x1000")27	bus.AddDevice("powerpc", "0x16000", "0x1000")28	bus.AddDevice("powerpc", "0x17000", "0x1000")29	bus.AddDevice("powerpc", "0x18000

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