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 2001 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, 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 /* Default to COFF2 for file output */
  61 #ifndef TICOFF_DEFAULT_MAGIC
  62 #define TICOFF_DEFAULT_MAGIC TICOFF2MAGIC
  63 #endif
  64
  65 /* This value is made available in the rare case where a bfd is unavailable */
  66 #ifndef OCTETS_PER_BYTE_POWER
  67 #error "OCTETS_PER_BYTE_POWER not defined for this CPU"
  68 #else
  69 #define OCTETS_PER_BYTE (1<<OCTETS_PER_BYTE_POWER)
  70 #endif
  71
  72 /* default alignment is on a byte (not octet!) boundary */
  73 #ifndef COFF_DEFAULT_SECTION_ALIGNMENT_POWER
  74 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0
  75 #endif
  76
  77 /* TI COFF encodes the section alignment in the section header flags */
  78 #define COFF_ALIGN_IN_SECTION_HEADER 1
  79 #define COFF_ALIGN_IN_S_FLAGS 1
  80 /* requires a power-of-two argument */
  81 #define COFF_ENCODE_ALIGNMENT(S,X) ((S).s_flags |= (((unsigned)(X)&0xF)<<8))
  82 /* result is a power of two */
  83 #define COFF_DECODE_ALIGNMENT(X) (((X)>>8)&0xF)
  84
  85 #define COFF0_P(ABFD) (bfd_coff_filhsz(ABFD) == FILHSZ_V0)
  86 #define COFF2_P(ABFD) (bfd_coff_scnhsz(ABFD) != SCNHSZ_V01)
  87
  88 #define COFF0_BADMAG(x) ((x).f_magic != TICOFF0MAGIC)
  89 #define COFF1_BADMAG(x) ((x).f_magic != TICOFF1MAGIC || (x).f_target_id != TI_TARGET_ID)
  90 #define COFF2_BADMAG(x) ((x).f_magic != TICOFF2MAGIC || (x).f_target_id != TI_TARGET_ID)
  91
  92 /* we need to read/write an extra field in the coff file header */
  93 #ifndef COFF_ADJUST_FILEHDR_IN_POST
  94 #define COFF_ADJUST_FILEHDR_IN_POST(abfd, src, dst) \
  95   do                                                                    \
  96     {                                                                   \
  97       ((struct internal_filehdr *)(dst))->f_target_id =                 \
  98         H_GET_16 (abfd, ((FILHDR *)(src))->f_target_id);                \
  99     }                                                                   \
 100   while (0)
 101 #endif
 102
 103 #ifndef COFF_ADJUST_FILEHDR_OUT_POST
 104 #define COFF_ADJUST_FILEHDR_OUT_POST(abfd, src, dst) \
 105   do                                                                    \
 106     {                                                                   \
 107       H_PUT_16 (abfd, ((struct internal_filehdr *)(src))->f_target_id,  \
 108                ((FILHDR *)(dst))->f_target_id);                         \
 109     }                                                                   \
 110   while (0)
 111 #endif
 112
 113 #define FILHDR  struct external_filehdr
 114 #define FILHSZ  22
 115 #define FILHSZ_V0 20                /* COFF0 omits target_id field */
 116
 117 /* File header flags */
 118 #define F_RELFLG        (0x0001)
 119 #define F_EXEC          (0x0002)
 120 #define F_LNNO          (0x0004)
 121 /* F_LSYMS needs to be redefined in your source file */
 122 #define F_LSYMS_TICOFF  (0x0010) /* normal COFF is 0x8 */
 123
 124 #define F_10            0x00    /* file built for TMS320C1x devices */
 125 #define F_20            0x10    /* file built for TMS320C2x devices */
 126 #define F_25            0x20    /* file built for TMS320C2x/C5x devices */
 127 #define F_LENDIAN       0x0100  /* 16 bits/word, LSB first */
 128 #define F_SYMMERGE      0x1000  /* duplicate symbols were removed */
 129
 130 /********************** OPTIONAL HEADER **********************/
 131
 132
 133 typedef struct
 134 {
 135   char  magic[2];               /* type of file (0x108)                 */
 136   char  vstamp[2];              /* version stamp                        */
 137   char  tsize[4];               /* text size in bytes, padded to FW bdry*/
 138   char  dsize[4];               /* initialized data "  "                */
 139   char  bsize[4];               /* uninitialized data "   "             */
 140   char  entry[4];               /* entry pt.                            */
 141   char  text_start[4];          /* base of text used for this file */
 142   char  data_start[4];          /* base of data used for this file */
 143 }
 144 AOUTHDR;
 145
 146
 147 #define AOUTHDRSZ 28
 148 #define AOUTSZ 28
 149
 150
 151 /********************** SECTION HEADER **********************/
 152 /* COFF0, COFF1 */
 153 struct external_scnhdr_v01 {
 154         char            s_name[8];      /* section name                 */
 155         char            s_paddr[4];     /* physical address, aliased s_nlib */
 156         char            s_vaddr[4];     /* virtual address              */
 157         char            s_size[4];      /* section size (in WORDS)      */
 158         char            s_scnptr[4];    /* file ptr to raw data for section */
 159         char            s_relptr[4];    /* file ptr to relocation       */
 160         char            s_lnnoptr[4];   /* file ptr to line numbers     */
 161         char            s_nreloc[2];    /* number of relocation entries */
 162         char            s_nlnno[2];     /* number of line number entries*/
 163         char            s_flags[2];     /* flags                        */
 164         char            s_reserved[1];  /* reserved                     */
 165         char            s_page[1];      /* section page number (LOAD)   */
 166 };
 167
 168 /* COFF2 */
 169 struct external_scnhdr {
 170         char            s_name[8];      /* section name                 */
 171         char            s_paddr[4];     /* physical address, aliased s_nlib */
 172         char            s_vaddr[4];     /* virtual address              */
 173         char            s_size[4];      /* section size (in WORDS)      */
 174         char            s_scnptr[4];    /* file ptr to raw data for section */
 175         char            s_relptr[4];    /* file ptr to relocation       */
 176         char            s_lnnoptr[4];   /* file ptr to line numbers     */
 177         char            s_nreloc[4];    /* number of relocation entries */
 178         char            s_nlnno[4];     /* number of line number entries*/
 179         char            s_flags[4];     /* flags                        */
 180         char            s_reserved[2];  /* reserved                     */
 181         char            s_page[2];      /* section page number (LOAD)   */
 182 };
 183
 184 /*
 185  * Special section flags
 186  */
 187
 188 /* TI COFF defines these flags;
 189    STYP_CLINK: the section should be excluded from the final
 190    linker output if there are no references found to any symbol in the section
 191    STYP_BLOCK: the section should be blocked, i.e. if the section would cross
 192    a page boundary, it is started at a page boundary instead.
 193    TI COFF puts the section alignment power of two in the section flags
 194    e.g. 2**N is alignment, flags |= (N & 0xF) << 8
 195 */
 196 #define STYP_CLINK      (0x4000)
 197 #define STYP_BLOCK      (0x1000)
 198 #define STYP_ALIGN      (0x0F00) /* TI COFF stores section alignment here */
 199
 200 #define SCNHDR_V01 struct external_scnhdr_v01
 201 #define SCNHDR struct external_scnhdr
 202 #define SCNHSZ_V01 40                  /* for v0 and v1 */
 203 #define SCNHSZ 48
 204
 205 /* COFF2 changes the offsets and sizes of these fields
 206    Assume we're dealing with the COFF2 scnhdr structure, and adjust
 207    accordingly
 208  */
 209 #define GET_SCNHDR_NRELOC(ABFD, PTR) \
 210   (COFF2_P (ABFD) ? H_GET_32 (ABFD, PTR) : H_GET_16 (ABFD, PTR))
 211 #define PUT_SCNHDR_NRELOC(ABFD, VAL, PTR) \
 212   (COFF2_P (ABFD) ? H_PUT_32 (ABFD, VAL, PTR) : H_PUT_16 (ABFD, VAL, PTR))
 213 #define GET_SCNHDR_NLNNO(ABFD, PTR) \
 214   (COFF2_P (ABFD) ? H_GET_32 (ABFD, PTR) : H_GET_16 (ABFD, (PTR) -2))
 215 #define PUT_SCNHDR_NLNNO(ABFD, VAL, PTR) \
 216   (COFF2_P (ABFD) ? H_PUT_32 (ABFD, VAL, PTR) : H_PUT_16 (ABFD, VAL, (PTR) -2))
 217 #define GET_SCNHDR_FLAGS(ABFD, PTR) \
 218   (COFF2_P (ABFD) ? H_GET_32 (ABFD, PTR) : H_GET_16 (ABFD, (PTR) -4))
 219 #define PUT_SCNHDR_FLAGS(ABFD, VAL, PTR) \
 220   (COFF2_P (ABFD) ? H_PUT_32 (ABFD, VAL, PTR) : H_PUT_16 (ABFD, VAL, (PTR) -4))
 221 #define GET_SCNHDR_PAGE(ABFD, PTR) \
 222   (COFF2_P (ABFD) ? H_GET_16 (ABFD, PTR) : (unsigned) H_GET_8 (ABFD, (PTR) -7))
 223 /* on output, make sure that the "reserved" field is zero */
 224 #define PUT_SCNHDR_PAGE(ABFD, VAL, PTR) \
 225   (COFF2_P (ABFD) \
 226    ? H_PUT_16 (ABFD, VAL, PTR) \
 227    : H_PUT_8 (ABFD, VAL, (PTR) -7), H_PUT_8 (ABFD, 0, (PTR) -8))
 228
 229 /* TI COFF stores section size as number of bytes (address units, not octets),
 230    so adjust to be number of octets, which is what BFD expects */
 231 #define GET_SCNHDR_SIZE(ABFD, SZP) \
 232   (H_GET_32 (ABFD, SZP) * bfd_octets_per_byte (ABFD))
 233 #define PUT_SCNHDR_SIZE(ABFD, SZ, SZP) \
 234   H_PUT_32 (ABFD, (SZ) / bfd_octets_per_byte (ABFD), SZP)
 235
 236 #define COFF_ADJUST_SCNHDR_IN_POST(ABFD, EXT, INT) \
 237   do                                                                    \
 238     {                                                                   \
 239       ((struct internal_scnhdr *)(INT))->s_page =                       \
 240         GET_SCNHDR_PAGE (ABFD, ((SCNHDR *)(EXT))->s_page);              \
 241     }                                                                   \
 242    while (0)
 243
 244 /* The line number and reloc overflow checking in coff_swap_scnhdr_out in
 245    coffswap.h doesn't use PUT_X for s_nlnno and s_nreloc.
 246    Due to different sized v0/v1/v2 section headers, we have to re-write these
 247    fields.
 248  */
 249 #define COFF_ADJUST_SCNHDR_OUT_POST(ABFD, INT, EXT) \
 250   do                                                                       \
 251     {                                                                      \
 252       PUT_SCNHDR_NLNNO (ABFD, ((struct internal_scnhdr *)(INT))->s_nlnno,  \
 253                         ((SCNHDR *)(EXT))->s_nlnno);                       \
 254       PUT_SCNHDR_NRELOC (ABFD, ((struct internal_scnhdr *)(INT))->s_nreloc,\
 255                          ((SCNHDR *)(EXT))->s_nreloc);                     \
 256       PUT_SCNHDR_FLAGS (ABFD, ((struct internal_scnhdr *)(INT))->s_flags,  \
 257                         ((SCNHDR *)(EXT))->s_flags);                       \
 258       PUT_SCNHDR_PAGE (ABFD, ((struct internal_scnhdr *)(INT))->s_page,    \
 259                        ((SCNHDR *)(EXT))->s_page);                         \
 260     }                                                                      \
 261    while (0)
 262
 263 /*
 264  * names of "special" sections
 265  */
 266 #define _TEXT   ".text"
 267 #define _DATA   ".data"
 268 #define _BSS    ".bss"
 269 #define _CINIT  ".cinit"            /* initialized C data */
 270 #define _SCONST  ".const"           /* constants */
 271 #define _SWITCH ".switch"           /* switch tables */
 272 #define _STACK  ".stack"            /* C stack */
 273 #define _SYSMEM ".sysmem"           /* used for malloc et al. syscalls */
 274
 275 /********************** LINE NUMBERS **********************/
 276
 277 /* 1 line number entry for every "breakpointable" source line in a section.
 278  * Line numbers are grouped on a per function basis; first entry in a function
 279  * grouping will have l_lnno = 0 and in place of physical address will be the
 280  * symbol table index of the function name.
 281  */
 282 struct external_lineno {
 283   union {
 284     char l_symndx[4];   /* function name symbol index, iff l_lnno == 0*/
 285     char l_paddr[4];    /* (physical) address of line number    */
 286   } l_addr;
 287   char l_lnno[2];       /* line number          */
 288 };
 289
 290 #define LINENO  struct external_lineno
 291 #define LINESZ  6
 292
 293
 294 /********************** SYMBOLS **********************/
 295
 296 /* NOTE: this is what a local label looks like in assembly source; what it
 297    looks like in COFF output is undefined */
 298 #define TICOFF_LOCAL_LABEL_P(NAME) \
 299 ((NAME[0] == '$' && NAME[1] >= '0' && NAME[1] <= '9' && NAME[2] == '\0') \
 300  || NAME[strlen(NAME)-1] == '?')
 301
 302 #define E_SYMNMLEN      8       /* # characters in a symbol name        */
 303 #define E_FILNMLEN      14      /* # characters in a file name          */
 304 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 305
 306 struct external_syment
 307 {
 308   union {
 309     char e_name[E_SYMNMLEN];
 310     struct {
 311       char e_zeroes[4];
 312       char e_offset[4];
 313     } e;
 314   } e;
 315   char e_value[4];
 316   char e_scnum[2];
 317   char e_type[2];
 318   char e_sclass[1];
 319   char e_numaux[1];
 320 };
 321
 322
 323 #define N_BTMASK        (017)
 324 #define N_TMASK         (060)
 325 #define N_BTSHFT        (4)
 326 #define N_TSHIFT        (2)
 327
 328
 329 union external_auxent {
 330   struct {
 331         char x_tagndx[4];       /* str, un, or enum tag indx */
 332         union {
 333           struct {
 334                 char  x_lnno[2]; /* declaration line number */
 335                 char  x_size[2]; /* str/union/array size */
 336           } x_lnsz;
 337           char x_fsize[4];      /* size of function */
 338         } x_misc;
 339         union {
 340           struct {              /* if ISFCN, tag, or .bb */
 341                 char x_lnnoptr[4];      /* ptr to fcn line # */
 342                 char x_endndx[4];       /* entry ndx past block end */
 343           } x_fcn;
 344           struct {              /* if ISARY, up to 4 dimen. */
 345                 char x_dimen[E_DIMNUM][2];
 346           } x_ary;
 347         } x_fcnary;
 348         char x_tvndx[2];                /* tv index */
 349   } x_sym;
 350
 351   union {
 352         char x_fname[E_FILNMLEN];
 353         struct {
 354           char x_zeroes[4];
 355           char x_offset[4];
 356         } x_n;
 357   } x_file;
 358
 359   struct {
 360         char x_scnlen[4];                       /* section length */
 361         char x_nreloc[2];       /* # relocation entries */
 362         char x_nlinno[2];       /* # line numbers */
 363   } x_scn;
 364
 365   struct {
 366         char x_tvfill[4];       /* tv fill value */
 367         char x_tvlen[2];        /* length of .tv */
 368         char x_tvran[2][2];     /* tv range */
 369   } x_tv;               /* info about .tv section (in auxent of symbol .tv)) */
 370
 371
 372 };
 373
 374 #define SYMENT  struct external_syment
 375 #define SYMESZ  18
 376 #define AUXENT  union external_auxent
 377 #define AUXESZ  18
 378
 379 /* section lengths are in target bytes (not host bytes) */
 380 #define GET_SCN_SCNLEN(ABFD, EXT) \
 381   (H_GET_32 (ABFD, (EXT)->x_scn.x_scnlen) * bfd_octets_per_byte (ABFD))
 382 #define PUT_SCN_SCNLEN(ABFD, INT, EXT) \
 383   H_PUT_32 (ABFD, (INT) / bfd_octets_per_byte (ABFD), (EXT)->x_scn.x_scnlen)
 384
 385 /* lnsz size is in bits in COFF file, in bytes in BFD */
 386 #define GET_LNSZ_SIZE(abfd, ext) \
 387  (H_GET_16 (abfd, ext->x_sym.x_misc.x_lnsz.x_size) / (class != C_FIELD ? 8 : 1))
 388
 389 #define PUT_LNSZ_SIZE(abfd, in, ext) \
 390   H_PUT_16 (abfd, ((class != C_FIELD) ? (in) * 8 : (in)), \
 391            ext->x_sym.x_misc.x_lnsz.x_size)
 392
 393 /* TI COFF stores offsets for MOS and MOU in bits; BFD expects bytes
 394    Also put the load page flag of the section into the symbol value if it's an
 395    address.  */
 396 #ifndef NEEDS_PAGE
 397 #define NEEDS_PAGE(X) 0
 398 #define PAGE_MASK 0
 399 #endif
 400 #define COFF_ADJUST_SYM_IN_POST(ABFD, EXT, INT) \
 401   do                                                                    \
 402     {                                                                   \
 403       struct internal_syment *dst = (struct internal_syment *)(INT);    \
 404       if (dst->n_sclass == C_MOS || dst->n_sclass == C_MOU)             \
 405         dst->n_value /= 8;                                              \
 406       else if (NEEDS_PAGE (dst->n_sclass)) {                            \
 407         asection *scn = coff_section_from_bfd_index (abfd, dst->n_scnum); \
 408         dst->n_value |= (scn->lma & PAGE_MASK);                         \
 409       }                                                                 \
 410     }                                                                   \
 411    while (0)
 412
 413 #define COFF_ADJUST_SYM_OUT_POST(ABFD, INT, EXT) \
 414   do                                                                    \
 415     {                                                                   \
 416        struct internal_syment *src = (struct internal_syment *)(INT);   \
 417        SYMENT *dst = (SYMENT *)(EXT);                                   \
 418        if (src->n_sclass == C_MOU || src->n_sclass == C_MOS)            \
 419          H_PUT_32 (abfd, src->n_value * 8, dst->e_value);               \
 420        else if (NEEDS_PAGE (src->n_sclass)) {                           \
 421          H_PUT_32 (abfd, src->n_value &= ~PAGE_MASK, dst->e_value);     \
 422        }                                                                \
 423     }                                                                   \
 424    while (0)
 425
 426 /* Detect section-relative absolute symbols so they get flagged with a sym
 427    index of -1.
 428 */
 429 #define SECTION_RELATIVE_ABSOLUTE_SYMBOL_P(RELOC, SECT) \
 430   ((*(RELOC)->sym_ptr_ptr)->section->output_section == (SECT) \
 431    && (RELOC)->howto->name[0] == 'A')
 432
 433 /********************** RELOCATION DIRECTIVES **********************/
 434
 435 struct external_reloc_v0
 436 {
 437   char r_vaddr[4];
 438   char r_symndx[2];
 439   char r_reserved[2];
 440   char r_type[2];
 441 };
 442
 443 struct external_reloc
 444 {
 445   char r_vaddr[4];
 446   char r_symndx[4];
 447   char r_reserved[2]; /* extended pmad byte for COFF2 */
 448   char r_type[2];
 449 };
 450
 451 #define RELOC struct external_reloc
 452 #define RELSZ_V0 10                 /* FIXME -- coffcode.h needs fixing */
 453 #define RELSZ 12                    /* for COFF1/2 */
 454
 455 /* various relocation types.  */
 456 #define R_ABS     0x0000            /* no relocation */
 457 #define R_REL13   0x002A            /* 13-bit direct reference (???) */
 458 #define R_PARTLS7 0x0028            /* 7 LSBs of an address */
 459 #define R_PARTMS9 0x0029            /* 9MSBs of an address */
 460 #define R_EXTWORD 0x002B            /* 23-bit direct reference */
 461 #define R_EXTWORD16 0x002C          /* 16-bit direct reference to 23-bit addr*/
 462 #define R_EXTWORDMS7 0x002D         /* upper 7 bits of 23-bit address */
 463
 464 #endif /* COFF_TI_H */