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

Automation Testing Tutorials

Learn to execute automation testing from scratch with LambdaTest Learning Hub. Right from setting up the prerequisites to run your first automation test, to following best practices and diving deeper into advanced test scenarios. LambdaTest Learning Hubs compile a list of step-by-step guides to help you be proficient with different test automation frameworks i.e. Selenium, Cypress, TestNG etc.