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How to use generateArg method of x86 Package

Best Syzkaller code snippet using x86.generateArg

encode.go

Source:encode.go

...185		if !insn.NoSibDisp {186			if addrSize == 2 {187				if mod == 1 {188					// disp8189					code = append(code, generateArg(cfg, r, 1)...)190				} else if mod == 2 || mod == 0 && rm == 6 {191					// disp16192					code = append(code, generateArg(cfg, r, 2)...)193				}194			} else {195				var sibbase byte196				if mod != 3 && rm == 4 {197					// SIB198					scale := byte(r.Intn(4))199					index := byte(r.Intn(8))200					sibbase = byte(r.Intn(8))201					if insn.Avx2Gather {202						rrrr := reg | (1-vexR)<<3203						for {204							iiii := index | (1-vexX)<<3205							if iiii != vvvv^0xf && iiii != rrrr {206								break207							}208							index = (index + 1) & 7209						}210					}211					sib := scale<<6 | index<<3 | sibbase212					code = append(code, sib)213				}214				if mod == 1 {215					// disp8216					code = append(code, generateArg(cfg, r, 1)...)217				} else if mod == 2 || mod == 0 && rm == 5 || mod == 0 && sibbase == 5 {218					// disp16/32219					code = append(code, generateArg(cfg, r, dispSize)...)220				}221			}222		}223	}224	addImm := func(imm int) {225		if imm == -1 {226			imm = immSize227		} else if imm == -2 {228			imm = addrSize229		} else if imm == -3 {230			imm = operSize231		}232		if imm != 0 {233			code = append(code, generateArg(cfg, r, imm)...)234		}235	}236	addImm(int(insn.Imm))237	addImm(int(insn.Imm2))238	code = append(code, insn.Suffix...)239	return code240}...

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