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How to use makeGen method of x86 Package

Best Syzkaller code snippet using x86.makeGen

pseudo.go

Source:pseudo.go

...11		Mode:   1<<iset.ModeLast - 1,12		Priv:   true,13		Pseudo: true,14		generator: func(cfg *iset.Config, r *rand.Rand) []byte {15			gen := makeGen(cfg, r)16			msr := msrs[r.Intn(len(msrs))]17			gen.mov32(regECX, msr)18			gen.byte(0x0f, 0x32) // rdmsr19			return gen.text20		},21	},22	{23		Name:   "PSEUDO_WRMSR",24		Mode:   1<<iset.ModeLast - 1,25		Priv:   true,26		Pseudo: true,27		generator: func(cfg *iset.Config, r *rand.Rand) []byte {28			gen := makeGen(cfg, r)29			msr := msrs[r.Intn(len(msrs))]30			v := iset.GenerateInt(cfg, r, 8)31			gen.mov32(regECX, msr)32			gen.mov32(regEAX, uint32(v>>0))33			gen.mov32(regEDX, uint32(v>>32))34			gen.byte(0x0f, 0x30) // wrmsr35			return gen.text36		},37	},38	{39		Name:   "PSEUDO_PCI_READ",40		Mode:   1<<iset.ModeLast - 1,41		Priv:   true,42		Pseudo: true,43		generator: func(cfg *iset.Config, r *rand.Rand) []byte {44			gen := makeGen(cfg, r)45			addr, port, size := pciAddrPort(r)46			gen.out32(0xcf8, addr)47			gen.in(port, size)48			return gen.text49		},50	},51	{52		Name:   "PSEUDO_PCI_WRITE",53		Mode:   1<<iset.ModeLast - 1,54		Priv:   true,55		Pseudo: true,56		generator: func(cfg *iset.Config, r *rand.Rand) []byte {57			gen := makeGen(cfg, r)58			addr, port, size := pciAddrPort(r)59			val := iset.GenerateInt(cfg, r, 4)60			gen.out32(0xcf8, addr)61			gen.out(port, uint32(val), size)62			return gen.text63		},64	},65	{66		Name:   "PSEUDO_PORT_READ",67		Mode:   1<<iset.ModeLast - 1,68		Priv:   true,69		Pseudo: true,70		generator: func(cfg *iset.Config, r *rand.Rand) []byte {71			gen := makeGen(cfg, r)72			port := ports[r.Intn(len(ports))]73			gen.in(port, r.Intn(3))74			return gen.text75		},76	},77	{78		Name:   "PSEUDO_PORT_WRITE",79		Mode:   1<<iset.ModeLast - 1,80		Priv:   true,81		Pseudo: true,82		generator: func(cfg *iset.Config, r *rand.Rand) []byte {83			gen := makeGen(cfg, r)84			port := ports[r.Intn(len(ports))]85			val := iset.GenerateInt(cfg, r, 4)86			gen.out(port, uint32(val), r.Intn(3))87			return gen.text88		},89	},90	{91		Name:   "PSEUDO_XOR_CR",92		Mode:   1<<iset.ModeLast - 1,93		Priv:   true,94		Pseudo: true,95		generator: func(cfg *iset.Config, r *rand.Rand) []byte {96			gen := makeGen(cfg, r)97			cr := controlRegisters[r.Intn(len(controlRegisters))]98			var v uint3299			if cr == 8 {100				v = uint32(r.Intn(15) + 1)101			} else {102				bit := controlRegistersBits[cr][r.Intn(len(controlRegistersBits[cr]))]103				v = 1 << bit104			}105			gen.readCR(cr)106			gen.xor32(regEAX, v)107			gen.writeCR(cr)108			return gen.text109		},110	},111	{112		Name:   "PSEUDO_XOR_EFER",113		Mode:   1<<iset.ModeLast - 1,114		Priv:   true,115		Pseudo: true,116		generator: func(cfg *iset.Config, r *rand.Rand) []byte {117			gen := makeGen(cfg, r)118			gen.mov32(regECX, eferMSR)119			gen.byte(0x0f, 0x32) // rdmsr120			bit := eferBits[r.Intn(len(eferBits))]121			gen.xor32(regEAX, 1<<bit)122			gen.byte(0x0f, 0x30) // wrmsr123			return gen.text124		},125	},126	{127		Name:   "PSEUDO_SET_BREAK",128		Mode:   1<<iset.ModeLast - 1,129		Priv:   true,130		Pseudo: true,131		generator: func(cfg *iset.Config, r *rand.Rand) []byte {132			gen := makeGen(cfg, r)133			br := uint8(r.Intn(4))134			loc := uint32(r.Intn(4))135			typ := uint32(r.Intn(16))136			addr := iset.GenerateInt(cfg, r, 8)137			if cfg.Mode == iset.ModeLong64 {138				gen.mov64(regRAX, addr)139			} else {140				gen.mov32(regEAX, uint32(addr))141			}142			gen.writeDR(br)143			gen.readDR(7)144			gen.xor32(regEAX, loc<<(br*2)|typ<<(16+br*4))145			gen.writeDR(7)146			return gen.text147		},148	},149	{150		Name:   "PSEUDO_LOAD_SEG",151		Mode:   1<<iset.ModeLast - 1,152		Priv:   true,153		Pseudo: true,154		generator: func(cfg *iset.Config, r *rand.Rand) []byte {155			gen := makeGen(cfg, r)156			sel := randSelector(r)157			if cfg.Mode == iset.ModeReal16 {158				sel = uint16(iset.GenerateInt(cfg, r, 8)) >> 4159			}160			reg := uint8(r.Intn(6))161			gen.mov16(regAX, sel)162			gen.byte(0x8e, 0xc0|(reg<<3)) // MOV %ax, %seg163			return gen.text164		},165	},166	{167		Name:   "PSEUDO_FAR_JMP",168		Mode:   1<<iset.ModeLong64 | 1<<iset.ModeProt32 | 1<<iset.ModeProt16,169		Priv:   true,170		Pseudo: true,171		generator: func(cfg *iset.Config, r *rand.Rand) []byte {172			gen := makeGen(cfg, r)173			sel := randSelector(r)174			off := iset.GenerateInt(cfg, r, 4)175			if cfg.Mode == iset.ModeLong64 {176				gen.mov32toSPaddr(uint32(sel), 0)177				gen.mov32toSPaddr(uint32(off), 2)178				if r.Intn(2) == 0 {179					gen.byte(0xff, 0x2c, 0x24) // ljmp (%rsp)180				} else {181					gen.byte(0xff, 0x1c, 0x24) // lcall (%rsp)182				}183			} else {184				if r.Intn(2) == 0 {185					gen.byte(0xea) // ljmp $imm16, $imm16/32186				} else {187					gen.byte(0x9a) // lcall $imm16, $imm16/32188				}189				if cfg.Mode == iset.ModeProt16 {190					gen.imm16(uint16(off))191				} else {192					gen.imm32(uint32(off))193				}194				gen.imm16(sel)195			}196			return gen.text197		},198	},199	{200		Name:   "PSEUDO_LTR_LLDT",201		Mode:   1<<iset.ModeLong64 | 1<<iset.ModeProt32 | 1<<iset.ModeProt16,202		Priv:   true,203		Pseudo: true,204		generator: func(cfg *iset.Config, r *rand.Rand) []byte {205			gen := makeGen(cfg, r)206			sel := randSelector(r)207			gen.mov16(regAX, sel)208			if r.Intn(2) == 0 {209				gen.byte(0x0f, 0x00, 0xd8) // ltr %ax210			} else {211				gen.byte(0x0f, 0x00, 0xd0) // lldt %ax212			}213			return gen.text214		},215	},216	{217		Name:   "PSEUDO_LGIDT",218		Mode:   1<<iset.ModeLong64 | 1<<iset.ModeProt32 | 1<<iset.ModeProt16,219		Priv:   true,220		Pseudo: true,221		generator: func(cfg *iset.Config, r *rand.Rand) []byte {222			gen := makeGen(cfg, r)223			limit := uint32(iset.GenerateInt(cfg, r, 2))224			base := uint32(iset.GenerateInt(cfg, r, 4))225			gen.mov32toSPaddr(limit, 0)226			gen.mov32toSPaddr(base, 2)227			gen.mov32toSPaddr(0, 6)228			gen.addr32()229			if r.Intn(2) == 0 {230				gen.byte(0x0f, 0x01, 0x14, 0x24) // lgdt (%rsp)231			} else {232				gen.byte(0x0f, 0x01, 0x1c, 0x24) // lidt (%rsp)233			}234			return gen.text235		},236	},237	{238		Name:   "PSEUDO_HYPERCALL",239		Mode:   1<<iset.ModeLong64 | 1<<iset.ModeProt32 | 1<<iset.ModeProt16,240		Priv:   true,241		Pseudo: true,242		generator: func(cfg *iset.Config, r *rand.Rand) []byte {243			gen := makeGen(cfg, r)244			switch r.Intn(2) {245			case 0:246				gen.mov32(regEAX, 1) // KVM_HC_VAPIC_POLL_IRQ247			case 1:248				gen.mov32(regEAX, 5)                                   // KVM_HC_KICK_CPU249				gen.mov32(regECX, uint32(iset.GenerateInt(cfg, r, 4))) // APIC ID250			default:251				panic("bad")252			}253			if r.Intn(2) == 0 {254				gen.byte(0x0f, 0x01, 0xd9) // vmmcall255			} else {256				gen.byte(0x0f, 0x01, 0xc1) // vmcall257			}258			return gen.text259		},260	},261}262const (263	regAL = iota264	regAX265	regEAX266	regRAX267	regCL268	regCX269	regECX270	regRCX271	regDL272	regDX273	regEDX274	regRDX275)276type generator struct {277	mode iset.Mode278	r    *rand.Rand279	text []byte280}281func makeGen(cfg *iset.Config, r *rand.Rand) *generator {282	return &generator{283		mode: cfg.Mode,284		r:    r,285	}286}287func (gen *generator) byte(v ...uint8) {288	gen.text = append(gen.text, v...)289}290func (gen *generator) imm16(v uint16) {291	gen.byte(byte(v>>0), byte(v>>8))292}293func (gen *generator) imm32(v uint32) {294	gen.byte(byte(v>>0), byte(v>>8), byte(v>>16), byte(v>>24))295}...

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