| ... | @@ -97,6 +97,13 @@ pub fn parse(self: *Object) !void { | ... | @@ -97,6 +97,13 @@ pub fn parse(self: *Object) !void { |
| 97 | try self.readLoadCommands(reader); | 97 | try self.readLoadCommands(reader); |
| 98 | if (self.symtab_cmd_index != null) try self.parseSymtab(); | 98 | if (self.symtab_cmd_index != null) try self.parseSymtab(); |
| 99 | if (self.data_in_code_cmd_index != null) try self.readDataInCode(); | 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 | pub fn readLoadCommands(self: *Object, reader: anytype) !void { | 109 | pub fn readLoadCommands(self: *Object, reader: anytype) !void { |
| ... | @@ -163,6 +170,56 @@ 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 | pub fn parseSymtab(self: *Object) !void { | 223 | pub fn parseSymtab(self: *Object) !void { |
| 167 | const symtab_cmd = self.load_commands.items[self.symtab_cmd_index.?].Symtab; | 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