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How to use addImm method of main Package

Best Syzkaller code snippet using main.addImm

gen.go

Source:gen.go

...268		case v == "lock_prefix":269			insn.Prefix = append(insn.Prefix, 0xF0)270		// Immediates.271		case v == "UIMM8()", v == "SIMM8()":272			addImm(insn, 1)273		case v == "UIMM16()":274			addImm(insn, 2)275		case v == "UIMM32()":276			addImm(insn, 4)277		case v == "SIMMz()":278			addImm(insn, -1)279		case v == "UIMMv()":280			addImm(insn, -3)281		case v == "UIMM8_1()":282			addImm(insn, 1)283		case v == "BRDISP8()":284			addImm(insn, 1)285		case v == "BRDISP32()":286			addImm(insn, 4)287		case v == "BRDISPz()":288			addImm(insn, -1)289		case v == "MEMDISPv()":290			addImm(insn, -2)291		// VOP/VEX292		case v == "XOPV":293			insn.Vex = 0x8f294			insn.Mode &^= 1 << ifuzz.ModeReal16295		case v == "EVV":296			insn.Vex = 0xc4297		case v == "VV1":298			insn.Vex = 0xc4299		case v == "VMAP0":300			insn.VexMap = 0301		case v == "V0F":302			insn.VexMap = 1303		case v == "V0F38":304			insn.VexMap = 2305		case v == "V0F3A":306			insn.VexMap = 3307		case v == "XMAP8":308			insn.VexMap = 8309		case v == "XMAP9":310			insn.VexMap = 9311		case v == "XMAPA":312			insn.VexMap = 10313		case v == "VNP":314			insn.VexP = 0315		case v == "V66":316			insn.VexP = 1317		case v == "VF2":318			insn.VexP = 3319		case v == "VF3":320			insn.VexP = 2321		case v == "VL128", v == "VL=0":322			insn.VexL = -1323		case v == "VL256", v == "VL=1":324			insn.VexL = 1325		case v == "NOVSR":326			insn.VexNoR = true327		case v == "NOEVSR":328			insn.VexNoR = true329			// VEXDEST3=0b1 VEXDEST210=0b111 VEXDEST4=0b0330		case v == "SE_IMM8()":331			addImm(insn, 1)332		// Modes333		case v == "mode64":334			insn.Mode &= 1 << ifuzz.ModeLong64335		case v == "not64":336			insn.Mode &^= 1 << ifuzz.ModeLong64337		case v == "mode32":338			insn.Mode &= 1 << ifuzz.ModeProt32339		case v == "mode16":340			insn.Mode &= 1<<ifuzz.ModeProt16 | 1<<ifuzz.ModeReal16341		case v == "eamode64",342			v == "eamode32",343			v == "eamode16",344			v == "eanot16":345		case v == "no_refining_prefix":346			insn.NoRepPrefix = true347			insn.No66Prefix = true348		case v == "no66_prefix", v == "eosz32", v == "eosz64":349			insn.No66Prefix = true350		case v == "eosz16", v == "eosznot64", v == "REP!=3":351			// TODO(dvyukov): this may have some effect on REP/66 prefixes,352			// but this wasn't checked. These are just added here to unbreak build.353		case v == "f2_refining_prefix", v == "refining_f2", v == "repne", v == "REP=2":354			insn.Prefix = append(insn.Prefix, 0xF2)355			insn.NoRepPrefix = true356		case v == "f3_refining_prefix", v == "refining_f3", v == "repe", v == "REP=3":357			insn.Prefix = append(insn.Prefix, 0xF3)358			insn.NoRepPrefix = true359		case v == "norep", v == "not_refining", v == "REP=0":360			insn.NoRepPrefix = true361		case v == "osz_refining_prefix":362			insn.Prefix = append(insn.Prefix, 0x66)363			insn.NoRepPrefix = true364		case v == "rexw_prefix", v == "W1":365			insn.Rexw = 1366		case v == "norexw_prefix", v == "W0":367			insn.Rexw = -1368		case v == "MPXMODE=1",369			v == "MPXMODE=0",370			v == "TZCNT=1",371			v == "TZCNT=0",372			v == "LZCNT=1",373			v == "LZCNT=0",374			v == "CR_WIDTH()",375			v == "DF64()",376			v == "IMMUNE_REXW()",377			v == "FORCE64()",378			v == "EOSZ=1",379			v == "EOSZ!=1",380			v == "EOSZ=2",381			v == "EOSZ!=2",382			v == "EOSZ=3",383			v == "EOSZ!=3",384			v == "BRANCH_HINT()",385			v == "P4=1",386			v == "P4=0",387			v == "rexb_prefix",388			v == "norexb_prefix",389			v == "IMMUNE66()",390			v == "REFINING66()",391			v == "IGNORE66()",392			v == "IMMUNE66_LOOP64()",393			v == "OVERRIDE_SEG0()",394			v == "OVERRIDE_SEG1()",395			v == "REMOVE_SEGMENT()",396			v == "ONE()",397			v == "nolock_prefix",398			v == "MODRM()",399			v == "VMODRM_XMM()",400			v == "VMODRM_YMM()",401			v == "BCRC=0",402			v == "BCRC=1",403			v == "ESIZE_8_BITS()",404			v == "ESIZE_16_BITS()",405			v == "ESIZE_32_BITS()",406			v == "ESIZE_64_BITS()",407			v == "ESIZE_128_BITS()",408			v == "NELEM_GPR_WRITER_STORE()",409			v == "NELEM_GPR_WRITER_STORE_BYTE()",410			v == "NELEM_GPR_WRITER_STORE_WORD()",411			v == "NELEM_GPR_WRITER_LDOP_Q()",412			v == "NELEM_GPR_WRITER_LDOP_D()",413			v == "NELEM_GPR_READER()",414			v == "NELEM_GPR_READER_BYTE()",415			v == "NELEM_GPR_READER_WORD()",416			v == "NELEM_GSCAT()",417			v == "NELEM_HALF()",418			v == "NELEM_FULL()",419			v == "NELEM_FULLMEM()",420			v == "NELEM_QUARTERMEM()",421			v == "NELEM_EIGHTHMEM()",422			v == "NELEM_HALFMEM()",423			v == "NELEM_MEM128()",424			v == "NELEM_SCALAR()",425			v == "NELEM_TUPLE1()",426			v == "NELEM_TUPLE2()",427			v == "NELEM_TUPLE4()",428			v == "NELEM_TUPLE8()",429			v == "NELEM_TUPLE1_4X()",430			v == "NELEM_TUPLE1_BYTE()",431			v == "NELEM_TUPLE1_WORD()",432			v == "NELEM_MOVDDUP()",433			v == "UISA_VMODRM_XMM()",434			v == "UISA_VMODRM_YMM()",435			v == "UISA_VMODRM_ZMM()",436			v == "MASK=0",437			v == "FIX_ROUND_LEN128()",438			v == "FIX_ROUND_LEN512()",439			v == "AVX512_ROUND()",440			v == "ZEROING=0",441			v == "SAE()",442			v == "VL512", // VL=2443			v == "not_refining_f3",444			v == "EVEXRR_ONE",445			v == "CET=0",446			v == "CET=1",447			v == "WBNOINVD=0",448			v == "WBNOINVD=1",449			v == "CLDEMOTE=0",450			v == "CLDEMOTE=1",451			strings.HasPrefix(v, "MODEP5="):452		default:453			return errSkip(fmt.Sprintf("unknown pattern %v", v))454		}455	}456	if insn.Modrm {457		switch insn.Mod {458		case -3, -1, 0, 1, 2, 3:459		default:460			return fmt.Errorf("bad MOD value: %v", insn.Mod)461		}462		if insn.Reg < -1 || insn.Reg > 7 {463			return fmt.Errorf("bad REG value: %v", insn.Mod)464		}465		if insn.Rm < -1 || insn.Rm > 7 {466			return fmt.Errorf("bad RM value: %v", insn.Mod)467		}468	}469	if insn.Imm != 0 && len(insn.Suffix) != 0 {470		return fmt.Errorf("both immediate and suffix opcode")471	}472	if insn.Mode == 0 {473		return errSkip("no modes for instruction")474	}475	return nil476}477func parseOperands(insn *ifuzz.Insn, vals []string) error {478	for _, v := range vals {479		switch v {480		case "REG0=SEG():r", "REG1=SEG():r", "REG0=SEG():w":481			if insn.Reg != -1 {482				return fmt.Errorf("REG=SEG() operand, but fixed reg")483			}484			insn.Reg = -6485		case "REG0=CR_R():w", "REG1=CR_R():r":486			if insn.Reg != -1 {487				return fmt.Errorf("REG=CR_R() operand, but fixed reg")488			}489			insn.Reg = -8490			insn.NoSibDisp = true491		case "REG0=DR_R():w", "REG1=DR_R():r":492			insn.NoSibDisp = true493		case "MEM0:r:mem16", "MEM0:w:mem16", "MEM0:r:mem16int", "MEM0:w:mem16int":494			insn.Mem16 = true495		case "MEM0:r:mem32real", "MEM0:r:mem32int", "MEM0:w:mem32real", "MEM0:w:mem32int":496			insn.Mem32 = true497		}498	}499	return nil500}501func parseModrm(v string) (int8, error) {502	if len(v) < 4 || len(v) > 7 || v[0] != '[' || v[len(v)-1] != ']' {503		return 0, fmt.Errorf("malformed")504	}505	if v == "[mm]" || v == "[rrr]" || v == "[nnn]" {506		return -1, nil507	}508	if !strings.HasPrefix(v, "[0b") {509		return 0, fmt.Errorf("malformed")510	}511	var vv int8512	for i := 3; i < len(v)-1; i++ {513		if v[i] != '0' && v[i] != '1' {514			return 0, fmt.Errorf("malformed")515		}516		vv *= 2517		if v[i] == '1' {518			vv++519		}520	}521	return vv, nil522}523func addImm(insn *ifuzz.Insn, imm int8) {524	if insn.Imm == 0 {525		insn.Imm = imm526		return527	}528	if insn.Imm2 == 0 {529		insn.Imm2 = imm530		return531	}532	panic("too many immediates")533}534func failf(msg string, args ...interface{}) {535	fmt.Fprintf(os.Stderr, msg+"\n", args...)536	os.Exit(1)537}...

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