Analyze a given function, and creates a canonical representation for it. Args: func_ea (int): effective address of the wanted function src_mode (bool): True iff analyzing a self-compiled source file, otherwise analyzing a binary function Return Value:
(self, func_ea, src_mode)
| 100 | return function_calls |
| 101 | |
| 102 | def analyzeFunction(self, func_ea, src_mode): |
| 103 | """Analyze a given function, and creates a canonical representation for it. |
| 104 | |
| 105 | Args: |
| 106 | func_ea (int): effective address of the wanted function |
| 107 | src_mode (bool): True iff analyzing a self-compiled source file, otherwise analyzing a binary function |
| 108 | |
| 109 | Return Value: |
| 110 | FunctionContext object representing the analyzed function |
| 111 | """ |
| 112 | func = sark.Function(func_ea) |
| 113 | if src_mode: |
| 114 | context = sourceContext()(self.funcNameInner(func.name), 0) # Index is irrelevant for the source analysis |
| 115 | else: |
| 116 | context = binaryContext()(func_ea, self.funcNameInner(func.name), 0) # The index will be adjusted later, manually |
| 117 | |
| 118 | func_start = func.start_ea |
| 119 | instr_count = 0 |
| 120 | call_candidates = set() |
| 121 | code_hash = md5() |
| 122 | for line in func.lines: |
| 123 | instr_count += 1 |
| 124 | # Numeric Constants |
| 125 | data_refs = list(line.drefs_from) |
| 126 | for oper in [x for x in line.insn.operands if x.type.is_imm]: |
| 127 | if oper.imm not in data_refs: |
| 128 | context.recordConst(oper.imm) |
| 129 | # Data Refs (strings, fptrs) |
| 130 | for ref in data_refs: |
| 131 | # Check for a string (finds un-analyzed strings too) |
| 132 | str_const = self.disas.stringAt(ref) |
| 133 | if str_const is not None and len(str_const) >= MIN_STR_SIZE: |
| 134 | context.recordString(str_const) |
| 135 | continue |
| 136 | # Check for an fptr |
| 137 | called_func = self.disas.funcAt(ref) |
| 138 | if called_func is not None: |
| 139 | call_candidates.add(self.disas.funcStart(called_func)) |
| 140 | elif src_mode: |
| 141 | call_candidates.add(ref) |
| 142 | continue |
| 143 | # Code Refs (calls and unknowns) |
| 144 | for cref in line.crefs_from: |
| 145 | called_func = self.disas.funcAt(cref) |
| 146 | if called_func is None: |
| 147 | continue |
| 148 | called_func_start = self.disas.funcStart(called_func) |
| 149 | if (cref == func_start and line.insn.is_call) or called_func_start != func_start: |
| 150 | call_candidates.add(called_func_start) |
| 151 | # in binary mode don't let the call_candidates expand too much |
| 152 | if not src_mode: |
| 153 | [context.recordCall(x) for x in call_candidates] |
| 154 | call_candidates = set() |
| 155 | # hash the instruction (only in source mode) |
| 156 | else: |
| 157 | # two cases: |
| 158 | # 1. No linker fixups, hash the binary - easy case |
| 159 | # 2. Linker fixups, hash the text (includes the symbol name that the linker will use too) |
nothing calls this directly
no test coverage detected