How to use enc method of powerpc Package

Best Syzkaller code snippet using powerpc.enc

powerpc.go

Source:powerpc.go

...8// ./powerisa30_to_syz /home/aik/Documents/ppc/power9/PowerISA_public.v3.0B.pdf > 1.go9// .10package powerpc11import (12	"encoding/binary"13	"errors"14	"fmt"15	"math/rand"16	"github.com/google/syzkaller/pkg/ifuzz/iset"17)18type InsnBits struct {19	Start  uint // Big endian bit order.20	Length uint21}22type Insn struct {23	Name   string24	M64    bool // true if the instruction is 64bit _only_.25	Priv   bool26	Pseudo bool27	Fields map[string][]InsnBits // for ra/rb/rt/si/...28	Opcode uint3229	Mask   uint3230	insnMap   *insnSetMap31	generator func(cfg *iset.Config, r *rand.Rand) []byte32}33type insnSetMap map[string]*Insn34type InsnSet struct {35	Insns     []*Insn36	modeInsns iset.ModeInsns37	insnMap   insnSetMap38}39func (insnset *InsnSet) GetInsns(mode iset.Mode, typ iset.Type) []iset.Insn {40	return insnset.modeInsns[mode][typ]41}42func (insnset *InsnSet) Decode(mode iset.Mode, text []byte) (int, error) {43	if len(text) < 4 {44		return 0, errors.New("must be at least 4 bytes")45	}46	insn32 := binary.LittleEndian.Uint32(text)47	for _, ins := range insnset.Insns {48		if ins.Mask&insn32 == ins.Opcode {49			return 4, nil50		}51	}52	return 0, fmt.Errorf("unrecognised instruction %08x", insn32)53}54func (insnset *InsnSet) DecodeExt(mode iset.Mode, text []byte) (int, error) {55	return 0, fmt.Errorf("no external decoder")56}57func encodeBits(n uint, ff []InsnBits) uint32 {58	ret := uint32(0)59	for _, f := range ff {60		mask := uint(1<<f.Length) - 161		field := uint32((n & mask) << (31 - (f.Start + f.Length - 1)))62		ret = ret | field63		n = n >> f.Length64	}65	return ret66}67func (insn Insn) Encode(cfg *iset.Config, r *rand.Rand) []byte {68	if insn.Pseudo {69		return insn.generator(cfg, r)70	}71	ret := make([]byte, 0)72	insn32 := insn.Opcode73	if len(cfg.MemRegions) != 0 {74		// The PowerISA pdf parser could have missed some fields,75		// randomize them there.76		insn32 |= r.Uint32() & ^insn.Mask77	}78	for reg, bits := range insn.Fields {79		field := uint(r.Intn(1 << 16))80		insn32 |= encodeBits(field, bits)81		if len(cfg.MemRegions) != 0 && (reg == "RA" || reg == "RB" || reg == "RS") {82			val := iset.GenerateInt(cfg, r, 8)83			ret = append(ret, insn.insnMap.ld64(field, val)...)84		}85	}86	return append(ret, uint32toBytes(insn32)...)87}88func Register(insns []*Insn) {89	if len(insns) == 0 {90		panic("no instructions")91	}92	insnset := &InsnSet{93		Insns:   insns,94		insnMap: make(map[string]*Insn),95	}96	for _, insn := range insnset.Insns {97		insnset.insnMap[insn.Name] = insn98		insn.insnMap = &insnset.insnMap99	}100	insnset.initPseudo()101	for _, insn := range insnset.Insns {102		insnset.modeInsns.Add(insn)103	}104	iset.Arches[iset.ArchPowerPC] = insnset105}106func (insn *Insn) Info() (string, iset.Mode, bool, bool) {107	return insn.Name, insn.mode(), insn.Pseudo, insn.Priv108}109func (insn Insn) mode() iset.Mode {110	if insn.M64 {111		return (1 << iset.ModeLong64)112	}113	return (1 << iset.ModeLong64) | (1 << iset.ModeProt32)114}115func uint32toBytes(v uint32) []byte {116	ret := make([]byte, 4)117	binary.LittleEndian.PutUint32(ret, v)118	return ret119}120func (insn *Insn) enc(v map[string]uint) []byte {121	insn32 := insn.Opcode122	for reg, bits := range insn.Fields {123		if val, ok := v[reg]; ok {124			insn32 |= encodeBits(val, bits)125		}126	}127	return uint32toBytes(insn32)128}129func (imap insnSetMap) ld64(reg uint, v uint64) []byte {130	ret := make([]byte, 0)131	// This is a widely used macro to load immediate on ppc64132	// #define LOAD64(rn,name)133	//	addis   rn,0,name##@highest \ lis     rn,name##@highest134	//	ori     rn,rn,name##@higher135	//	rldicr  rn,rn,32,31136	//	oris    rn,rn,name##@h137	//	ori     rn,rn,name##@l138	ret = append(ret, imap["addis"].enc(map[string]uint{139		"RT": reg,140		"RA": 0, // In "addis", '0' means 0, not GPR0 .141		"SI": uint((v >> 48) & 0xffff)})...)142	ret = append(ret, imap["ori"].enc(map[string]uint{143		"RA": reg,144		"RS": reg,145		"UI": uint((v >> 32) & 0xffff)})...)146	ret = append(ret, imap["rldicr"].enc(map[string]uint{147		"RA": reg,148		"RS": reg,149		"SH": 32,150		"ME": 31})...)151	ret = append(ret, imap["oris"].enc(map[string]uint{152		"RA": reg,153		"RS": reg,154		"UI": uint((v >> 16) & 0xffff)})...)155	ret = append(ret, imap["ori"].enc(map[string]uint{156		"RA": reg,157		"RS": reg,158		"UI": uint(v & 0xffff)})...)159	return ret160}161func (imap insnSetMap) ld32(reg uint, v uint32) []byte {162	ret := make([]byte, 0)163	ret = append(ret, imap["addis"].enc(map[string]uint{164		"RT": reg,165		"RA": 0, // In "addis", '0' means 0, not GPR0166		"SI": uint((v >> 16) & 0xffff)})...)167	ret = append(ret, imap["ori"].enc(map[string]uint{168		"RA": reg,169		"RS": reg,170		"UI": uint(v & 0xffff)})...)171	return ret172}173func (imap insnSetMap) ldgpr32(regaddr, regval uint, addr uint64, v uint32) []byte {174	ret := make([]byte, 0)175	ret = append(ret, imap.ld64(regaddr, addr)...)176	ret = append(ret, imap.ld32(regval, v)...)177	ret = append(ret, imap["stw"].enc(map[string]uint{178		"RA": regaddr,179		"RS": regval})...)180	return ret181}182func (imap insnSetMap) sc(lev uint) []byte {183	return imap["sc"].enc(map[string]uint{"LEV": lev})184}...

pseudo.go

Source:pseudo.go

...118	imap := gen.imap119	tmpreg := uint(gen.r.Intn(32))120	// SRR0 contains a PC121	gen.byte(imap.ld64(tmpreg, iset.GenerateInt(gen.cfg, gen.r, 8)))122	gen.byte(imap["mtspr"].enc(map[string]uint{"RS": tmpreg, "SPR": SprnSrr0}))123	// SRR1 contains an MSR124	gen.byte(imap.ld64(tmpreg, gen.r.Uint64()))125	gen.byte(imap["mtspr"].enc(map[string]uint{"RS": tmpreg, "SPR": SprnSrr1}))126	gen.byte(imap["rfid"].enc(map[string]uint{}))127}...

enc

Using AI Code Generation

1import (2type powerpc struct {3}4func (p powerpc) enc() string {5	return fmt.Sprintf("The %s %s was released in %d", p.manufacturer, p.model, p.year)6}7func main() {8	p := powerpc{9	}10	fmt.Println(p.enc())11}12import (13type powerpc struct {14}15func (p powerpc) enc() string {16	return fmt.Sprintf("The %s %s was released in %d", p.manufacturer, p.model, p.year)17}18func main() {19	p := powerpc{20	}21	fmt.Println(p.enc())22}23import (24type powerpc struct {25}26func (p powerpc) enc() string {27	return fmt.Sprintf("The %s %s was released in %d", p.manufacturer, p.model, p.year)28}29func main() {30	p := powerpc{31	}32	fmt.Println(p.enc())33}34import (35type powerpc struct {36}37func (p powerpc) enc() string {38	return fmt.Sprintf("The %s %s was released in %d", p.manufacturer, p.model, p.year)39}40func main() {41	p := powerpc{42	}43	fmt.Println(p.enc())44}

enc

Using AI Code Generation

1import (2type powerpc struct {3}4func (p powerpc) enc() {5	fmt.Println("Encoding data")6}7func (p powerpc) dec() {8	fmt.Println("Decoding data")9}10func main() {11	fmt.Println(p1)12	p1.enc()13	p1.dec()14}

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