aboutsummaryrefslogtreecommitdiffstats
path: root/tmk_core/common/nodebug.h
diff options
context:
space:
mode:
Diffstat (limited to 'tmk_core/common/nodebug.h')
0 files changed, 0 insertions, 0 deletions
56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404
--  Binary file COFF writer.
--  Copyright (C) 2006 Tristan Gingold
--
--  This program is free software: you can redistribute it and/or modify
--  it under the terms of the GNU General Public License as published by
--  the Free Software Foundation, either version 2 of the License, or
--  (at your option) any later version.
--
--  This program is distributed in the hope that it will be useful,
--  but WITHOUT ANY WARRANTY; without even the implied warranty of
--  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
--  GNU General Public License for more details.
--
--  You should have received a copy of the GNU General Public License
--  along with this program.  If not, see <gnu.org/licenses>.
with Coff; use Coff;

package body Binary_File.Coff is
   NUL : Character renames ASCII.NUL;

   procedure Write (Fd : GNAT.OS_Lib.File_Descriptor)
   is
      use GNAT.OS_Lib;

      procedure Xwrite (Data : System.Address; Len : Natural) is
      begin
         if Write (Fd, Data, Len) /= Len then
            raise Write_Error;
         end if;
      end Xwrite;

      type Section_Info_Type is record
         Sect : Section_Acc;
         --  File offset for the data.
         Data_Offset : Natural;
         --  File offset for the relocs.
         Reloc_Offset : Natural;
         --  Number of relocs to write.
         Nbr_Relocs : Natural;
      end record;
      type Section_Info_Array is array (Natural range <>) of Section_Info_Type;
      Sections : Section_Info_Array (1 .. Nbr_Sections + 3);
      Nbr_Sect : Natural;
      Sect_Text : constant Natural := 1;
      Sect_Data : constant Natural := 2;
      Sect_Bss : constant Natural := 3;
      Sect : Section_Acc;

      --Section_Align : constant Natural := 2;

      Offset : Natural;
      Symtab_Offset : Natural;
      --  Number of symtab entries.
      Nbr_Symbols : Natural;
      Strtab_Offset : Natural;

      function Gen_String (Str : String) return Sym_Name
      is
         Res : Sym_Name;
      begin
         if Str'Length <= 8 then
            Res.E_Name := (others => NUL);
            Res.E_Name (1 .. Str'Length) := Str;
         else
            Res.E := (E_Zeroes => 0, E_Offset => Unsigned_32 (Offset));
            Offset := Offset + Str'Length + 1;
         end if;
         return Res;
      end Gen_String;

      --  Well known sections name.
      type String_Array is array (Sect_Text .. Sect_Bss) of String (1 .. 8);
      Sect_Name : constant String_Array :=
        (Sect_Text => ".text" & NUL & NUL & NUL,
         Sect_Data => ".data" & NUL & NUL & NUL,
         Sect_Bss => ".bss" & NUL & NUL & NUL & NUL);
      type Unsigned32_Array is array (Sect_Text .. Sect_Bss) of Unsigned_32;
      Sect_Flags : constant Unsigned32_Array :=
        (Sect_Text => STYP_TEXT,
         Sect_Data => STYP_DATA,
         Sect_Bss => STYP_BSS);

      --  If true, do local relocs.
      Flag_Reloc : constant Boolean := True;
      --  If true, discard local symbols;
      Flag_Discard_Local : Boolean := True;
   begin
      --  If relocations are not performs, then local symbols cannot be
      --  discarded.
      if not Flag_Reloc then
         Flag_Discard_Local := False;
      end if;

      --  Fill sections.
      Sect := Section_Chain;
      Nbr_Sect := 3;
      declare
         N : Natural;
      begin
         while Sect /= null loop
            if Sect.Name.all = ".text" then
               N := Sect_Text;
            elsif Sect.Name.all = ".data" then
               N := Sect_Data;
            elsif Sect.Name.all = ".bss" then
               N := Sect_Bss;
            else
               Nbr_Sect := Nbr_Sect + 1;
               N := Nbr_Sect;
            end if;
            Sections (N).Sect := Sect;
            Sect.Number := N;
            Sect := Sect.Next;
         end loop;
      end;

      --  Set data offset.
      Offset := Filehdr_Size + Nbr_Sect * Scnhdr_Size;
      for I in 1 .. Nbr_Sect loop
         if Sections (I).Sect /= null
           and then Sections (I).Sect.Data /= null
         then
            Sections (I).Data_Offset := Offset;
            Offset := Offset + Natural (Sections (I).Sect.Pc);
         else
            Sections (I).Data_Offset := 0;
         end if;
      end loop;

      --  Set relocs offset.
      declare
         Rel : Reloc_Acc;
      begin
         for I in 1 .. Nbr_Sect loop
            Sections (I).Nbr_Relocs := 0;
            if Sections (I).Sect /= null then
               Sections (I).Reloc_Offset := Offset;
               if not Flag_Reloc then
                  --  Do local relocations.
                  Rel := Sections (I).Sect.First_Reloc;
                  while Rel /= null loop
                     if S_Local (Rel.Sym) then
                        if Get_Section (Rel.Sym) = Sections (I).Sect
                        then
                           --  Intra section local reloc.
                           Apply_Reloc (Sections (I).Sect, Rel);
                        else
                           --  Inter section local reloc.
                           --  A relocation is still required.
                           Sections (I).Nbr_Relocs :=
                             Sections (I).Nbr_Relocs + 1;
                           --  FIXME: todo.
                           raise Program_Error;
                        end if;
                     else
                        Sections (I).Nbr_Relocs := Sections (I).Nbr_Relocs + 1;
                     end if;
                     Rel := Rel.Sect_Next;
                  end loop;
               else
                  Sections (I).Nbr_Relocs := Sections (I).Sect.Nbr_Relocs;
               end if;
               Offset := Offset + Sections (I).Nbr_Relocs * Relsz;
            else
               Sections (I).Reloc_Offset := 0;
            end if;
         end loop;
      end;

      Symtab_Offset := Offset;
      Nbr_Symbols := 2 + Nbr_Sect * 2; --  2 for file.
      for I in Symbols.First .. Symbols.Last loop
         Set_Number (I, Nbr_Symbols);
         Nbr_Symbols := Nbr_Symbols + 1;
      end loop;
      Offset := Offset + Nbr_Symbols * Symesz;
      Strtab_Offset := Offset;
      Offset := Offset + 4;

      --  Write file header.
      declare
         Hdr : Filehdr;
      begin
         Hdr.F_Magic := I386magic;
         Hdr.F_Nscns := Unsigned_16 (Nbr_Sect);
         Hdr.F_Timdat := 0;
         Hdr.F_Symptr := Unsigned_32 (Symtab_Offset);
         Hdr.F_Nsyms := Unsigned_32 (Nbr_Symbols);
         Hdr.F_Opthdr := 0;
         Hdr.F_Flags := F_Lnno;
         Xwrite (Hdr'Address, Filehdr_Size);
      end;

      --  Write sections header.
      for I in 1 .. Nbr_Sect loop
         declare
            Hdr : Scnhdr;
            L : Natural;
         begin
            case I is
               when Sect_Text
                 | Sect_Data
                 | Sect_Bss =>
                  Hdr.S_Name := Sect_Name (I);
                  Hdr.S_Flags := Sect_Flags (I);
               when others =>
                  Hdr.S_Flags := 0;
                  L := Sections (I).Sect.Name'Length;
                  if L > Hdr.S_Name'Length then
                     Hdr.S_Name := Sections (I).Sect.Name
                       (Sections (I).Sect.Name'First ..
                        Sections (I).Sect.Name'First + Hdr.S_Name'Length - 1);
                  else
                     Hdr.S_Name (1 .. L) := Sections (I).Sect.Name.all;
                     Hdr.S_Name (L + 1 .. Hdr.S_Name'Last) := (others => NUL);
                  end if;
            end case;
            Hdr.S_Paddr := 0;
            Hdr.S_Vaddr := 0;
            Hdr.S_Scnptr := Unsigned_32 (Sections (I).Data_Offset);
            Hdr.S_Relptr := Unsigned_32 (Sections (I).Reloc_Offset);
            Hdr.S_Lnnoptr := 0;
            Hdr.S_Nreloc := Unsigned_16 (Sections (I).Nbr_Relocs);
            if Sections (I).Sect /= null then
               Hdr.S_Size := Unsigned_32 (Sections (I).Sect.Pc);
            else
               Hdr.S_Size := 0;
            end if;
            Hdr.S_Nlnno := 0;
            Xwrite (Hdr'Address, Scnhdr_Size);
         end;
      end loop;

      --  Write sections content.
      for I in 1 .. Nbr_Sect loop
         if Sections (I).Sect /= null
           and then Sections (I).Sect.Data /= null
         then
            Xwrite (Sections (I).Sect.Data (0)'Address,
                    Natural (Sections (I).Sect.Pc));
         end if;
      end loop;

      --  Write sections reloc.
      for I in 1 .. Nbr_Sect loop
         if Sections (I).Sect /= null then
            declare
               R : Reloc_Acc;
               Rel : Reloc;
            begin
               R := Sections (I).Sect.First_Reloc;
               while R /= null loop
                  case R.Kind is
                     when Reloc_32 =>
                        Rel.R_Type := Reloc_Addr32;
                     when Reloc_Pc32 =>
                        Rel.R_Type := Reloc_Rel32;
                     when others =>
                        raise Program_Error;
                  end case;
                  Rel.R_Vaddr := Unsigned_32 (R.Addr);
                  Rel.R_Symndx := Unsigned_32 (Get_Number (R.Sym));
                  Xwrite (Rel'Address, Relsz);
                  R := R.Sect_Next;
               end loop;
            end;
         end if;
      end loop;

      --  Write symtab.
      --   Write file symbol + aux
      declare
         Sym : Syment;
         A_File : Auxent_File;
      begin
         Sym := (E => (Inline => True,
                       E_Name => ".file" & NUL & NUL & NUL),
                 E_Value => 0,
                 E_Scnum => N_DEBUG,
                 E_Type => 0,
                 E_Sclass => C_FILE,
                 E_Numaux => 1);
         Xwrite (Sym'Address, Symesz);
         A_File := (Inline => True,
                    X_Fname => "testfile.xxxxx");
         Xwrite (A_File'Address, Symesz);
      end;
      --   Write sections symbol + aux
      for I in 1 .. Nbr_Sect loop
         declare
            A_Scn : Auxent_Scn;
            Sym : Syment;
         begin
            Sym := (E => (Inline => True, E_Name => (others => NUL)),
                    E_Value => 0,
                    E_Scnum => Unsigned_16 (I),
                    E_Type => 0,
                    E_Sclass => C_STAT,
                    E_Numaux => 1);
            if I <= Sect_Bss then
               Sym.E.E_Name := Sect_Name (I);
            else
               Sym.E := Gen_String (Sections (I).Sect.Name.all);
            end if;
            Xwrite (Sym'Address, Symesz);
            if Sections (I).Sect /= null
              and then Sections (I).Sect.Data /= null
            then
               A_Scn :=
                 (X_Scnlen => Unsigned_32 (Sections (I).Sect.Pc),
                  X_Nreloc => Unsigned_16 (Sections (I).Nbr_Relocs),
                  X_Nlinno => 0);
            else
               A_Scn := (X_Scnlen => 0, X_Nreloc => 0, X_Nlinno => 0);
            end if;
            Xwrite (A_Scn'Address, Symesz);
         end;
      end loop;

      --   Write symbols.
      declare
         procedure Write_Symbol (S : Symbol)
         is
            Sym : Syment;
         begin
            Sym := (E => Gen_String (Get_Symbol_Name (S)),
                    E_Value => Unsigned_32 (Get_Symbol_Value (S)),
                    E_Scnum => 0,
                    E_Type => 0,
                    E_Sclass => C_EXT,
                    E_Numaux => 0);
            case Get_Scope (S) is
               when Sym_Local
                 | Sym_Private =>
                  Sym.E_Sclass := C_STAT;
               when Sym_Undef
                 | Sym_Global =>
                  Sym.E_Sclass := C_EXT;
            end case;
            if Get_Section (S) /= null then
               Sym.E_Scnum := Unsigned_16 (Get_Section (S).Number);
            end if;
            Xwrite (Sym'Address, Symesz);
         end Write_Symbol;
      begin
         --  First the non-local symbols (1).
         for I in Symbols.First .. Symbols.Last loop
            if Get_Scope (I) in Symbol_Scope_External then
               Write_Symbol (I);
            end if;
         end loop;
         --  Then the local symbols (2).
         if not Flag_Discard_Local then
            for I in Symbols.First .. Symbols.Last loop
               if Get_Scope (I) not in Symbol_Scope_External then
                  Write_Symbol (I);
               end if;
            end loop;
         end if;
      end;

      --  Write strtab.
      --    Write strtab length.
      declare
         L : Unsigned_32;

         procedure Write_String (Str : String) is
         begin
            if Str (Str'Last) /= NUL then
               raise Program_Error;
            end if;
            if Str'Length <= 9 then
               return;
            end if;
            Xwrite (Str'Address, Str'Length);
            Strtab_Offset := Strtab_Offset + Str'Length;
         end Write_String;
      begin
         L := Unsigned_32 (Offset - Strtab_Offset);
         Xwrite (L'Address, 4);

         --  Write section name string.
         for I in Sect_Bss + 1 .. Nbr_Sect loop
            if Sections (I).Sect /= null
              and then Sections (I).Sect.Name'Length > 8
            then
               Write_String (Sections (I).Sect.Name.all & NUL);
            end if;
         end loop;

         for I in Symbols.First .. Symbols.Last loop
            declare
               Str : constant String := Get_Symbol_Name (I);
            begin
               Write_String (Str & NUL);
            end;
         end loop;
         if Strtab_Offset + 4 /= Offset then
            raise Program_Error;
         end if;
      end;
   end Write;

end Binary_File.Coff;