| ... | ... | @@ -97,6 +97,13 @@ pub fn parse(self: *Object) !void { |
| 97 | 97 | try self.readLoadCommands(reader); |
| 98 | 98 | if (self.symtab_cmd_index != null) try self.parseSymtab(); |
| 99 | 99 | if (self.data_in_code_cmd_index != null) try self.readDataInCode(); |
| 100 | |
| 101 | { |
| 102 | const seg = self.load_commands.items[self.segment_cmd_index.?].Segment; |
| 103 | for (seg.sections.items) |_, sect_id| { |
| 104 | try self.parseRelocs(@intCast(u16, sect_id)); |
| 105 | } |
| 106 | } |
| 100 | 107 | } |
| 101 | 108 | |
| 102 | 109 | pub fn readLoadCommands(self: *Object, reader: anytype) !void { |
| ... | ... | @@ -163,6 +170,56 @@ pub fn readLoadCommands(self: *Object, reader: anytype) !void { |
| 163 | 170 | } |
| 164 | 171 | } |
| 165 | 172 | |
| 173 | pub fn parseRelocs(self: *Object, sect_id: u16) !void { |
| 174 | const seg = self.load_commands.items[self.segment_cmd_index.?].Segment; |
| 175 | const sect = seg.sections.items[sect_id]; |
| 176 | |
| 177 | if (sect.nreloc == 0) return; |
| 178 | |
| 179 | var raw_relocs = try self.allocator.alloc(u8, @sizeOf(macho.relocation_info) * sect.nreloc); |
| 180 | defer self.allocator.free(raw_relocs); |
| 181 | _ = try self.file.?.preadAll(raw_relocs, sect.reloff); |
| 182 | const relocs = mem.bytesAsSlice(macho.relocation_info, raw_relocs); |
| 183 | |
| 184 | for (relocs) |reloc| { |
| 185 | const is_addend = is_addend: { |
| 186 | switch (self.arch.?) { |
| 187 | .x86_64 => { |
| 188 | const rel_type = @intToEnum(macho.reloc_type_x86_64, reloc.r_type); |
| 189 | log.warn("{s}", .{rel_type}); |
| 190 | |
| 191 | break :is_addend false; |
| 192 | }, |
| 193 | .aarch64 => { |
| 194 | const rel_type = @intToEnum(macho.reloc_type_arm64, reloc.r_type); |
| 195 | log.warn("{s}", .{rel_type}); |
| 196 | |
| 197 | break :is_addend rel_type == .ARM64_RELOC_ADDEND; |
| 198 | }, |
| 199 | else => unreachable, |
| 200 | } |
| 201 | }; |
| 202 | |
| 203 | if (!is_addend) { |
| 204 | if (reloc.r_extern == 1) { |
| 205 | const sym = self.symtab.items[reloc.r_symbolnum]; |
| 206 | const sym_name = self.getString(sym.inner.n_strx); |
| 207 | log.warn(" | symbol = {s}", .{sym_name}); |
| 208 | } else { |
| 209 | const target_sect = seg.sections.items[reloc.r_symbolnum - 1]; |
| 210 | log.warn(" | section = {s},{s}", .{ |
| 211 | parseName(&target_sect.segname), |
| 212 | parseName(&target_sect.sectname), |
| 213 | }); |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | log.warn(" | offset = 0x{x}", .{reloc.r_address}); |
| 218 | log.warn(" | PC = {}", .{reloc.r_pcrel == 1}); |
| 219 | log.warn(" | length = {}", .{reloc.r_length}); |
| 220 | } |
| 221 | } |
| 222 | |
| 166 | 223 | pub fn parseSymtab(self: *Object) !void { |
| 167 | 224 | const symtab_cmd = self.load_commands.items[self.symtab_cmd_index.?].Symtab; |
| 168 | 225 | |
Jakub Konka <kubkon@jakubkonka.com> 2021-04-01 18:18:04+02:00
src