include/coff/ti.h

   1 /* COFF information for TI COFF support.  Definitions in this file should be
   2    customized in a target-specific file, and then this file included (see
   3    tic54x.h for an example).
   4
   5    Copyright 2000, 2001, 2002, 2003 Free Software Foundation, Inc.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */
  20 #ifndef COFF_TI_H
  21 #define COFF_TI_H
  22
  23 /* Note "coff/external.h is not used because TI adds extra fields to the structures.  */
  24
  25 /********************** FILE HEADER **********************/
  26
  27 struct external_filehdr
  28   {
  29     char f_magic[2];    /* magic number                 */
  30     char f_nscns[2];    /* number of sections           */
  31     char f_timdat[4];   /* time & date stamp            */
  32     char f_symptr[4];   /* file pointer to symtab       */
  33     char f_nsyms[4];    /* number of symtab entries     */
  34     char f_opthdr[2];   /* sizeof(optional hdr)         */
  35     char f_flags[2];    /* flags                        */
  36     char f_target_id[2];    /* magic no. (TI COFF-specific) */
  37   };
  38
  39 /* COFF0 has magic number in f_magic, and omits f_target_id from the file
  40    header; for later versions, f_magic is 0xC1 for COFF1 and 0xC2 for COFF2
  41    and the target-specific magic number is found in f_target_id */
  42
  43 #define TICOFF0MAGIC    TI_TARGET_ID
  44 #define TICOFF1MAGIC    0x00C1
  45 #define TICOFF2MAGIC    0x00C2
  46 #define TICOFF_AOUT_MAGIC    0x0108 /* magic number in optional header */
  47 #define TICOFF          1 /* customize coffcode.h */
  48
  49 /* The target_id field changes depending on the particular CPU target */
  50 /* for COFF0, the target id appeared in f_magic, where COFFX magic is now */
  51 #ifndef TI_TARGET_ID
  52 #error "TI_TARGET_ID needs to be defined for your CPU"
  53 #endif
  54
  55 /* Which bfd_arch to use... */
  56 #ifndef TICOFF_TARGET_ARCH
  57 #error "TICOFF_TARGET_ARCH needs to be defined for your CPU"
  58 #endif
  59
  60 #ifndef TICOFF_TARGET_MACHINE_GET
  61 #define TICOFF_TARGET_MACHINE_GET(FLAGS) 0
  62 #endif
  63
  64 #ifndef TICOFF_TARGET_MACHINE_SET
  65 #define TICOFF_TARGET_MACHINE_SET(FLAGSP, MACHINE)
  66 #endif
  67
  68 /* Default to COFF2 for file output */
  69 #ifndef TICOFF_DEFAULT_MAGIC
  70 #define TICOFF_DEFAULT_MAGIC TICOFF2MAGIC
  71 #endif
  72
  73 /* This value is made available in the rare case where a bfd is unavailable */
  74 #ifndef OCTETS_PER_BYTE_POWER
  75 #error "OCTETS_PER_BYTE_POWER not defined for this CPU"
  76 #else
  77 #define OCTETS_PER_BYTE (1<<OCTETS_PER_BYTE_POWER)
  78 #endif
  79
  80 /* default alignment is on a byte (not octet!) boundary */
  81 #ifndef COFF_DEFAULT_SECTION_ALIGNMENT_POWER
  82 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0
  83 #endif
  84
  85 /* TI COFF encodes the section alignment in the section header flags */
  86 #define COFF_ALIGN_IN_SECTION_HEADER 1
  87 #define COFF_ALIGN_IN_S_FLAGS 1
  88 /* requires a power-of-two argument */
  89 #define COFF_ENCODE_ALIGNMENT(S,X) ((S).s_flags |= (((unsigned)(X)&0xF)<<8))
  90 /* result is a power of two */
  91 #define COFF_DECODE_ALIGNMENT(X) (((X)>>8)&0xF)
  92
  93 #define COFF0_P(ABFD) (bfd_coff_filhsz(ABFD) == FILHSZ_V0)
  94 #define COFF2_P(ABFD) (bfd_coff_scnhsz(ABFD) != SCNHSZ_V01)
  95
  96 #define COFF0_BADMAG(x) ((x).f_magic != TICOFF0MAGIC)
  97 #define COFF1_BADMAG(x) ((x).f_magic != TICOFF1MAGIC || (x).f_target_id != TI_TARGET_ID)
  98 #define COFF2_BADMAG(x) ((x).f_magic != TICOFF2MAGIC || (x).f_target_id != TI_TARGET_ID)
  99
 100 /* we need to read/write an extra field in the coff file header */
 101 #ifndef COFF_ADJUST_FILEHDR_IN_POST
 102 #define COFF_ADJUST_FILEHDR_IN_POST(abfd, src, dst) \
 103   do                                                                    \
 104     {                                                                   \
 105       ((struct internal_filehdr *)(dst))->f_target_id =                 \
 106         H_GET_16 (abfd, ((FILHDR *)(src))->f_target_id);                \
 107     }                                                                   \
 108   while (0)
 109 #endif
 110
 111 #ifndef COFF_ADJUST_FILEHDR_OUT_POST
 112 #define COFF_ADJUST_FILEHDR_OUT_POST(abfd, src, dst) \
 113   do                                                                    \
 114     {                                                                   \
 115       H_PUT_16 (abfd, ((struct internal_filehdr *)(src))->f_target_id,  \
 116                ((FILHDR *)(dst))->f_target_id);                         \
 117     }                                                                   \
 118   while (0)
 119 #endif
 120
 121 #define FILHDR  struct external_filehdr
 122 #define FILHSZ  22
 123 #define FILHSZ_V0 20                /* COFF0 omits target_id field */
 124
 125 /* File header flags */
 126 #define F_RELFLG        (0x0001)
 127 #define F_EXEC          (0x0002)
 128 #define F_LNNO          (0x0004)
 129 #define F_VERS          (0x0010) /* TMS320C4x code */
 130 /* F_LSYMS needs to be redefined in your source file */
 131 #define F_LSYMS_TICOFF  (0x0010) /* normal COFF is 0x8 */
 132
 133 #define F_10            0x00    /* file built for TMS320C1x devices */
 134 #define F_20            0x10    /* file built for TMS320C2x devices */
 135 #define F_25            0x20    /* file built for TMS320C2x/C5x devices */
 136 #define F_LENDIAN       0x0100  /* 16 bits/word, LSB first */
 137 #define F_SYMMERGE      0x1000  /* duplicate symbols were removed */
 138
 139 /********************** OPTIONAL HEADER **********************/
 140
 141
 142 typedef struct
 143 {
 144   char  magic[2];               /* type of file (0x108)                 */
 145   char  vstamp[2];              /* version stamp                        */
 146   char  tsize[4];               /* text size in bytes, padded to FW bdry*/
 147   char  dsize[4];               /* initialized data "  "                */
 148   char  bsize[4];               /* uninitialized data "   "             */
 149   char  entry[4];               /* entry pt.                            */
 150   char  text_start[4];          /* base of text used for this file */
 151   char  data_start[4];          /* base of data used for this file */
 152 }
 153 AOUTHDR;
 154
 155
 156 #define AOUTHDRSZ 28
 157 #define AOUTSZ 28
 158
 159
 160 /********************** SECTION HEADER **********************/
 161 /* COFF0, COFF1 */
 162 struct external_scnhdr_v01 {
 163         char            s_name[8];      /* section name                 */
 164         char            s_paddr[4];     /* physical address, aliased s_nlib */
 165         char            s_vaddr[4];     /* virtual address              */
 166         char            s_size[4];      /* section size (in WORDS)      */
 167         char            s_scnptr[4];    /* file ptr to raw data for section */
 168         char            s_relptr[4];    /* file ptr to relocation       */
 169         char            s_lnnoptr[4];   /* file ptr to line numbers     */
 170         char            s_nreloc[2];    /* number of relocation entries */
 171         char            s_nlnno[2];     /* number of line number entries*/
 172         char            s_flags[2];     /* flags                        */
 173         char            s_reserved[1];  /* reserved                     */
 174         char            s_page[1];      /* section page number (LOAD)   */
 175 };
 176
 177 /* COFF2 */
 178 struct external_scnhdr {
 179         char            s_name[8];      /* section name                 */
 180         char            s_paddr[4];     /* physical address, aliased s_nlib */
 181         char            s_vaddr[4];     /* virtual address              */
 182         char            s_size[4];      /* section size (in WORDS)      */
 183         char            s_scnptr[4];    /* file ptr to raw data for section */
 184         char            s_relptr[4];    /* file ptr to relocation       */
 185         char            s_lnnoptr[4];   /* file ptr to line numbers     */
 186         char            s_nreloc[4];    /* number of relocation entries */
 187         char            s_nlnno[4];     /* number of line number entries*/
 188         char            s_flags[4];     /* flags                        */
 189         char            s_reserved[2];  /* reserved                     */
 190         char            s_page[2];      /* section page number (LOAD)   */
 191 };
 192
 193 /*
 194  * Special section flags
 195  */
 196
 197 /* TI COFF defines these flags;
 198    STYP_CLINK: the section should be excluded from the final
 199    linker output if there are no references found to any symbol in the section
 200    STYP_BLOCK: the section should be blocked, i.e. if the section would cross
 201    a page boundary, it is started at a page boundary instead.
 202    TI COFF puts the section alignment power of two in the section flags
 203    e.g. 2**N is alignment, flags |= (N & 0xF) << 8
 204 */
 205 #define STYP_CLINK      (0x4000)
 206 #define STYP_BLOCK      (0x1000)
 207 #define STYP_ALIGN      (0x0F00) /* TI COFF stores section alignment here */
 208
 209 #define SCNHDR_V01 struct external_scnhdr_v01
 210 #define SCNHDR struct external_scnhdr
 211 #define SCNHSZ_V01 40                  /* for v0 and v1 */
 212 #define SCNHSZ 48
 213
 214 /* COFF2 changes the offsets and sizes of these fields
 215    Assume we're dealing with the COFF2 scnhdr structure, and adjust
 216    accordingly
 217  */
 218 #define GET_SCNHDR_NRELOC(ABFD, LOC) \
 219   (COFF2_P (ABFD) ? H_GET_32 (ABFD, LOC) : H_GET_16 (ABFD, LOC))
 220 #define PUT_SCNHDR_NRELOC(ABFD, VAL, LOC) \
 221   (COFF2_P (ABFD) ? H_PUT_32 (ABFD, VAL, LOC) : H_PUT_16 (ABFD, VAL, LOC))
 222 #define GET_SCNHDR_NLNNO(ABFD, LOC) \
 223   (COFF2_P (ABFD) ? H_GET_32 (ABFD, LOC) : H_GET_16 (ABFD, (LOC) - 2))
 224 #define PUT_SCNHDR_NLNNO(ABFD, VAL, LOC) \
 225   (COFF2_P (ABFD) ? H_PUT_32 (ABFD, VAL, LOC) : H_PUT_16 (ABFD, VAL, (LOC) - 2))
 226 #define GET_SCNHDR_FLAGS(ABFD, LOC) \
 227   (COFF2_P (ABFD) ? H_GET_32 (ABFD, LOC) : H_GET_16 (ABFD, (LOC) - 4))
 228 #define PUT_SCNHDR_FLAGS(ABFD, VAL, LOC) \
 229   (COFF2_P (ABFD) ? H_PUT_32 (ABFD, VAL, LOC) : H_PUT_16 (ABFD, VAL, (LOC) - 4))
 230 #define GET_SCNHDR_PAGE(ABFD, LOC) \
 231   (COFF2_P (ABFD) ? H_GET_16 (ABFD, LOC) : (unsigned) H_GET_8 (ABFD, (LOC) - 7))
 232 /* on output, make sure that the "reserved" field is zero */
 233 #define PUT_SCNHDR_PAGE(ABFD, VAL, LOC) \
 234   (COFF2_P (ABFD) \
 235    ? H_PUT_16 (ABFD, VAL, LOC) \
 236    : H_PUT_8 (ABFD, VAL, (LOC) - 7), H_PUT_8 (ABFD, 0, (LOC) - 8))
 237
 238 /* TI COFF stores section size as number of bytes (address units, not octets),
 239    so adjust to be number of octets, which is what BFD expects */
 240 #define GET_SCNHDR_SIZE(ABFD, SZP) \
 241   (H_GET_32 (ABFD, SZP) * bfd_octets_per_byte (ABFD))
 242 #define PUT_SCNHDR_SIZE(ABFD, SZ, SZP) \
 243   H_PUT_32 (ABFD, (SZ) / bfd_octets_per_byte (ABFD), SZP)
 244
 245 #define COFF_ADJUST_SCNHDR_IN_POST(ABFD, EXT, INT) \
 246   do                                                                    \
 247     {                                                                   \
 248       ((struct internal_scnhdr *)(INT))->s_page =                       \
 249         GET_SCNHDR_PAGE (ABFD, ((SCNHDR *)(EXT))->s_page);              \
 250     }                                                                   \
 251    while (0)
 252
 253 /* The line number and reloc overflow checking in coff_swap_scnhdr_out in
 254    coffswap.h doesn't use PUT_X for s_nlnno and s_nreloc.
 255    Due to different sized v0/v1/v2 section headers, we have to re-write these
 256    fields.
 257  */
 258 #define COFF_ADJUST_SCNHDR_OUT_POST(ABFD, INT, EXT) \
 259   do                                                                       \
 260     {                                                                      \
 261       PUT_SCNHDR_NLNNO (ABFD, ((struct internal_scnhdr *)(INT))->s_nlnno,  \
 262                         ((SCNHDR *)(EXT))->s_nlnno);                       \
 263       PUT_SCNHDR_NRELOC (ABFD, ((struct internal_scnhdr *)(INT))->s_nreloc,\
 264                          ((SCNHDR *)(EXT))->s_nreloc);                     \
 265       PUT_SCNHDR_FLAGS (ABFD, ((struct internal_scnhdr *)(INT))->s_flags,  \
 266                         ((SCNHDR *)(EXT))->s_flags);                       \
 267       PUT_SCNHDR_PAGE (ABFD, ((struct internal_scnhdr *)(INT))->s_page,    \
 268                        ((SCNHDR *)(EXT))->s_page);                         \
 269     }                                                                      \
 270    while (0)
 271
 272 /*
 273  * names of "special" sections
 274  */
 275 #define _TEXT   ".text"
 276 #define _DATA   ".data"
 277 #define _BSS    ".bss"
 278 #define _CINIT  ".cinit"            /* initialized C data */
 279 #define _SCONST  ".const"           /* constants */
 280 #define _SWITCH ".switch"           /* switch tables */
 281 #define _STACK  ".stack"            /* C stack */
 282 #define _SYSMEM ".sysmem"           /* used for malloc et al. syscalls */
 283
 284 /********************** LINE NUMBERS **********************/
 285
 286 /* 1 line number entry for every "breakpointable" source line in a section.
 287  * Line numbers are grouped on a per function basis; first entry in a function
 288  * grouping will have l_lnno = 0 and in place of physical address will be the
 289  * symbol table index of the function name.
 290  */
 291 struct external_lineno {
 292   union {
 293     char l_symndx[4];   /* function name symbol index, iff l_lnno == 0*/
 294     char l_paddr[4];    /* (physical) address of line number    */
 295   } l_addr;
 296   char l_lnno[2];       /* line number          */
 297 };
 298
 299 #define LINENO  struct external_lineno
 300 #define LINESZ  6
 301
 302
 303 /********************** SYMBOLS **********************/
 304
 305 /* NOTE: this is what a local label looks like in assembly source; what it
 306    looks like in COFF output is undefined */
 307 #define TICOFF_LOCAL_LABEL_P(NAME) \
 308 ((NAME[0] == '$' && NAME[1] >= '0' && NAME[1] <= '9' && NAME[2] == '\0') \
 309  || NAME[strlen(NAME)-1] == '?')
 310
 311 #define E_SYMNMLEN      8       /* # characters in a symbol name        */
 312 #define E_FILNMLEN      14      /* # characters in a file name          */
 313 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 314
 315 struct external_syment
 316 {
 317   union {
 318     char e_name[E_SYMNMLEN];
 319     struct {
 320       char e_zeroes[4];
 321       char e_offset[4];
 322     } e;
 323   } e;
 324   char e_value[4];
 325   char e_scnum[2];
 326   char e_type[2];
 327   char e_sclass[1];
 328   char e_numaux[1];
 329 };
 330
 331
 332 #define N_BTMASK        (017)
 333 #define N_TMASK         (060)
 334 #define N_BTSHFT        (4)
 335 #define N_TSHIFT        (2)
 336
 337
 338 union external_auxent {
 339   struct {
 340         char x_tagndx[4];       /* str, un, or enum tag indx */
 341         union {
 342           struct {
 343                 char  x_lnno[2]; /* declaration line number */
 344                 char  x_size[2]; /* str/union/array size */
 345           } x_lnsz;
 346           char x_fsize[4];      /* size of function */
 347         } x_misc;
 348         union {
 349           struct {              /* if ISFCN, tag, or .bb */
 350                 char x_lnnoptr[4];      /* ptr to fcn line # */
 351                 char x_endndx[4];       /* entry ndx past block end */
 352           } x_fcn;
 353           struct {              /* if ISARY, up to 4 dimen. */
 354                 char x_dimen[E_DIMNUM][2];
 355           } x_ary;
 356         } x_fcnary;
 357         char x_tvndx[2];                /* tv index */
 358   } x_sym;
 359
 360   union {
 361         char x_fname[E_FILNMLEN];
 362         struct {
 363           char x_zeroes[4];
 364           char x_offset[4];
 365         } x_n;
 366   } x_file;
 367
 368   struct {
 369         char x_scnlen[4];                       /* section length */
 370         char x_nreloc[2];       /* # relocation entries */
 371         char x_nlinno[2];       /* # line numbers */
 372   } x_scn;
 373
 374   struct {
 375         char x_tvfill[4];       /* tv fill value */
 376         char x_tvlen[2];        /* length of .tv */
 377         char x_tvran[2][2];     /* tv range */
 378   } x_tv;               /* info about .tv section (in auxent of symbol .tv)) */
 379
 380
 381 };
 382
 383 #define SYMENT  struct external_syment
 384 #define SYMESZ  18
 385 #define AUXENT  union external_auxent
 386 #define AUXESZ  18
 387
 388 /* section lengths are in target bytes (not host bytes) */
 389 #define GET_SCN_SCNLEN(ABFD, EXT) \
 390   (H_GET_32 (ABFD, (EXT)->x_scn.x_scnlen) * bfd_octets_per_byte (ABFD))
 391 #define PUT_SCN_SCNLEN(ABFD, INT, EXT) \
 392   H_PUT_32 (ABFD, (INT) / bfd_octets_per_byte (ABFD), (EXT)->x_scn.x_scnlen)
 393
 394 /* lnsz size is in bits in COFF file, in bytes in BFD */
 395 #define GET_LNSZ_SIZE(abfd, ext) \
 396  (H_GET_16 (abfd, ext->x_sym.x_misc.x_lnsz.x_size) / (class != C_FIELD ? 8 : 1))
 397
 398 #define PUT_LNSZ_SIZE(abfd, in, ext) \
 399   H_PUT_16 (abfd, ((class != C_FIELD) ? (in) * 8 : (in)), \
 400            ext->x_sym.x_misc.x_lnsz.x_size)
 401
 402 /* TI COFF stores offsets for MOS and MOU in bits; BFD expects bytes
 403    Also put the load page flag of the section into the symbol value if it's an
 404    address.  */
 405 #ifndef NEEDS_PAGE
 406 #define NEEDS_PAGE(X) 0
 407 #define PAGE_MASK 0
 408 #endif
 409 #define COFF_ADJUST_SYM_IN_POST(ABFD, EXT, INT) \
 410   do                                                                    \
 411     {                                                                   \
 412       struct internal_syment *dst = (struct internal_syment *)(INT);    \
 413       if (dst->n_sclass == C_MOS || dst->n_sclass == C_MOU)             \
 414         dst->n_value /= 8;                                              \
 415       else if (NEEDS_PAGE (dst->n_sclass)) {                            \
 416         asection *scn = coff_section_from_bfd_index (abfd, dst->n_scnum); \
 417         dst->n_value |= (scn->lma & PAGE_MASK);                         \
 418       }                                                                 \
 419     }                                                                   \
 420    while (0)
 421
 422 #define COFF_ADJUST_SYM_OUT_POST(ABFD, INT, EXT) \
 423   do                                                                    \
 424     {                                                                   \
 425        struct internal_syment *src = (struct internal_syment *)(INT);   \
 426        SYMENT *dst = (SYMENT *)(EXT);                                   \
 427        if (src->n_sclass == C_MOU || src->n_sclass == C_MOS)            \
 428          H_PUT_32 (abfd, src->n_value * 8, dst->e_value);               \
 429        else if (NEEDS_PAGE (src->n_sclass)) {                           \
 430          H_PUT_32 (abfd, src->n_value &= ~PAGE_MASK, dst->e_value);     \
 431        }                                                                \
 432     }                                                                   \
 433    while (0)
 434
 435 /* Detect section-relative absolute symbols so they get flagged with a sym
 436    index of -1.
 437 */
 438 #define SECTION_RELATIVE_ABSOLUTE_SYMBOL_P(RELOC, SECT) \
 439   ((*(RELOC)->sym_ptr_ptr)->section->output_section == (SECT) \
 440    && (RELOC)->howto->name[0] == 'A')
 441
 442 /********************** RELOCATION DIRECTIVES **********************/
 443
 444 struct external_reloc_v0
 445 {
 446   char r_vaddr[4];
 447   char r_symndx[2];
 448   char r_reserved[2];
 449   char r_type[2];
 450 };
 451
 452 struct external_reloc
 453 {
 454   char r_vaddr[4];
 455   char r_symndx[4];
 456   char r_reserved[2]; /* extended pmad byte for COFF2 */
 457   char r_type[2];
 458 };
 459
 460 #define RELOC struct external_reloc
 461 #define RELSZ_V0 10                 /* FIXME -- coffcode.h needs fixing */
 462 #define RELSZ 12                    /* for COFF1/2 */
 463
 464 /* various relocation types.  */
 465 #define R_ABS     0x0000            /* no relocation */
 466 #define R_REL13   0x002A            /* 13-bit direct reference (???) */
 467 #define R_PARTLS7 0x0028            /* 7 LSBs of an address */
 468 #define R_PARTMS9 0x0029            /* 9MSBs of an address */
 469 #define R_EXTWORD 0x002B            /* 23-bit direct reference */
 470 #define R_EXTWORD16 0x002C          /* 16-bit direct reference to 23-bit addr*/
 471 #define R_EXTWORDMS7 0x002D         /* upper 7 bits of 23-bit address */
 472
 473 #endif /* COFF_TI_H */