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 #ifndef COFF_TI_H
   5 #define COFF_TI_H
   6
   7 /********************** FILE HEADER **********************/
   8
   9 struct external_filehdr {
  10         char f_magic[2];        /* magic number                 */
  11         char f_nscns[2];        /* number of sections           */
  12         char f_timdat[4];       /* time & date stamp            */
  13         char f_symptr[4];       /* file pointer to symtab       */
  14         char f_nsyms[4];        /* number of symtab entries     */
  15         char f_opthdr[2];       /* sizeof(optional hdr)         */
  16         char f_flags[2];        /* flags                        */
  17         char f_target_id[2];    /* magic no. (TI COFF-specific) */
  18 };
  19
  20 /* COFF0 has magic number in f_magic, and omits f_target_id from the file
  21    header; for later versions, f_magic is 0xC1 for COFF1 and 0xC2 for COFF2
  22    and the target-specific magic number is found in f_target_id */
  23
  24 #define TICOFF0MAGIC    TI_TARGET_ID
  25 #define TICOFF1MAGIC    0x00C1
  26 #define TICOFF2MAGIC    0x00C2
  27 #define TICOFF_AOUT_MAGIC    0x0108 /* magic number in optional header */
  28 #define TICOFF          1 /* customize coffcode.h */
  29
  30 /* The target_id field changes depending on the particular CPU target */
  31 /* for COFF0, the target id appeared in f_magic, where COFFX magic is now */
  32 #ifndef TI_TARGET_ID
  33 #error "TI_TARGET_ID needs to be defined for your CPU"
  34 #endif
  35
  36 /* Which bfd_arch to use... */
  37 #ifndef TICOFF_TARGET_ARCH
  38 #error "TICOFF_TARGET_ARCH needs to be defined for your CPU"
  39 #endif
  40
  41 /* Default to COFF2 for file output */
  42 #ifndef TICOFF_DEFAULT_MAGIC
  43 #define TICOFF_DEFAULT_MAGIC TICOFF2MAGIC
  44 #endif
  45
  46 /* This value is made available in the rare case where a bfd is unavailable */
  47 #ifndef OCTETS_PER_BYTE_POWER
  48 #warn OCTETS_PER_BYTE_POWER not defined for this CPU, it will default to 0
  49 #else
  50 #define OCTETS_PER_BYTE (1<<OCTETS_PER_BYTE_POWER)
  51 #endif
  52
  53 /* default alignment is on a byte (not octet!) boundary */
  54 #ifndef COFF_DEFAULT_SECTION_ALIGNMENT_POWER
  55 #define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0
  56 #endif
  57
  58 /* TI COFF encodes the section alignment in the section header flags */
  59 #define COFF_ALIGN_IN_SECTION_HEADER 1
  60 #define COFF_ALIGN_IN_S_FLAGS 1
  61 /* requires a power-of-two argument */
  62 #define COFF_ENCODE_ALIGNMENT(S,X) ((S).s_flags |= (((unsigned)(X)&0xF)<<8))
  63 /* result is a power of two */
  64 #define COFF_DECODE_ALIGNMENT(X) (((X)>>8)&0xF)
  65
  66 #define COFF0_P(ABFD) (bfd_coff_filhsz(ABFD) == FILHSZ_V0)
  67 #define COFF2_P(ABFD) (bfd_coff_scnhsz(ABFD) != SCNHSZ_V01)
  68
  69 #define COFF0_BADMAG(x) ((x).f_magic != TICOFF0MAGIC)
  70 #define COFF1_BADMAG(x) ((x).f_magic != TICOFF1MAGIC || (x).f_target_id != TI_TARGET_ID)
  71 #define COFF2_BADMAG(x) ((x).f_magic != TICOFF2MAGIC || (x).f_target_id != TI_TARGET_ID)
  72
  73 /* we need to read/write an extra field in the coff file header */
  74 #ifndef COFF_ADJUST_FILEHDR_IN_POST
  75 #define COFF_ADJUST_FILEHDR_IN_POST(abfd,src,dst) \
  76 do { ((struct internal_filehdr *)(dst))->f_target_id = \
  77 bfd_h_get_16(abfd, (bfd_byte *)(((FILHDR *)(src))->f_target_id)); \
  78 ((struct internal_filehdr *)(dst))->f_flags |= F_LDPAGE; \
  79 } while(0)
  80 #endif
  81
  82 #ifndef COFF_ADJUST_FILEHDR_OUT_POST
  83 #define COFF_ADJUST_FILEHDR_OUT_POST(abfd,src,dst) \
  84 do { bfd_h_put_16(abfd, ((struct internal_filehdr *)(src))->f_target_id, \
  85              (bfd_byte *)(((FILHDR *)(dst))->f_target_id)); \
  86 } while(0)
  87 #endif
  88
  89 #define FILHDR  struct external_filehdr
  90 #define FILHSZ  22
  91 #define FILHSZ_V0 20                /* COFF0 omits target_id field */
  92
  93 /* File header flags */
  94 #define F_RELFLG        (0x0001)
  95 #define F_EXEC          (0x0002)
  96 #define F_LNNO          (0x0004)
  97 /* F_LSYMS needs to be redefined in your source file */
  98 #define F_LSYMS_TICOFF  (0x0010) /* normal COFF is 0x8 */
  99
 100 #define F_10            0x00    /* file built for TMS320C1x devices */
 101 #define F_20            0x10    /* file built for TMS320C2x devices */
 102 #define F_25            0x20    /* file built for TMS320C2x/C5x devices */
 103 #define F_LENDIAN       0x0100  /* 16 bits/word, LSB first */
 104 #define F_SYMMERGE      0x1000  /* duplicate symbols were removed */
 105
 106 /********************** OPTIONAL HEADER **********************/
 107
 108
 109 typedef struct
 110 {
 111   char  magic[2];               /* type of file (0x108)                 */
 112   char  vstamp[2];              /* version stamp                        */
 113   char  tsize[4];               /* text size in bytes, padded to FW bdry*/
 114   char  dsize[4];               /* initialized data "  "                */
 115   char  bsize[4];               /* uninitialized data "   "             */
 116   char  entry[4];               /* entry pt.                            */
 117   char  text_start[4];          /* base of text used for this file */
 118   char  data_start[4];          /* base of data used for this file */
 119 }
 120 AOUTHDR;
 121
 122
 123 #define AOUTHDRSZ 28
 124 #define AOUTSZ 28
 125
 126
 127 /********************** SECTION HEADER **********************/
 128 /* COFF0, COFF1 */
 129 struct external_scnhdr_v01 {
 130         char            s_name[8];      /* section name                 */
 131         char            s_paddr[4];     /* physical address, aliased s_nlib */
 132         char            s_vaddr[4];     /* virtual address              */
 133         char            s_size[4];      /* section size (in WORDS)      */
 134         char            s_scnptr[4];    /* file ptr to raw data for section */
 135         char            s_relptr[4];    /* file ptr to relocation       */
 136         char            s_lnnoptr[4];   /* file ptr to line numbers     */
 137         char            s_nreloc[2];    /* number of relocation entries */
 138         char            s_nlnno[2];     /* number of line number entries*/
 139         char            s_flags[2];     /* flags                        */
 140         char            s_reserved[1];  /* reserved                     */
 141         char            s_page[1];      /* section page number (LOAD)   */
 142 };
 143
 144 /* COFF2 */
 145 struct external_scnhdr {
 146         char            s_name[8];      /* section name                 */
 147         char            s_paddr[4];     /* physical address, aliased s_nlib */
 148         char            s_vaddr[4];     /* virtual address              */
 149         char            s_size[4];      /* section size (in WORDS)      */
 150         char            s_scnptr[4];    /* file ptr to raw data for section */
 151         char            s_relptr[4];    /* file ptr to relocation       */
 152         char            s_lnnoptr[4];   /* file ptr to line numbers     */
 153         char            s_nreloc[4];    /* number of relocation entries */
 154         char            s_nlnno[4];     /* number of line number entries*/
 155         char            s_flags[4];     /* flags                        */
 156         char            s_reserved[2];  /* reserved                     */
 157         char            s_page[2];      /* section page number (LOAD)   */
 158 };
 159
 160 /*
 161  * Special section flags
 162  */
 163 /* recognized load pages */
 164 #define PG_PROG         0x0         /* PROG page */
 165 #define PG_DATA         0x1         /* DATA page */
 166
 167 /* TI COFF defines these flags;
 168    STYP_CLINK: the section should be excluded from the final
 169    linker output if there are no references found to any symbol in the section
 170    STYP_BLOCK: the section should be blocked, i.e. if the section would cross
 171    a page boundary, it is started at a page boundary instead.
 172    TI COFF puts the section alignment power of two in the section flags
 173    e.g. 2**N is alignment, flags |= (N & 0xF) << 8
 174 */
 175 #define STYP_CLINK      (0x4000)
 176 #define STYP_BLOCK      (0x1000)
 177 #define STYP_ALIGN      (0x0F00) /* TI COFF stores section alignment here */
 178
 179 #define SCNHDR_V01 struct external_scnhdr_v01
 180 #define SCNHDR struct external_scnhdr
 181 #define SCNHSZ_V01 40                  /* for v0 and v1 */
 182 #define SCNHSZ 48
 183
 184 /* COFF2 changes the offsets and sizes of these fields
 185    Assume we're dealing with the COFF2 scnhdr structure, and adjust
 186    accordingly
 187  */
 188 #define GET_SCNHDR_NRELOC(ABFD,PTR) \
 189 (COFF2_P(ABFD) ? bfd_h_get_32 (ABFD,PTR) : bfd_h_get_16 (ABFD, PTR))
 190 #define PUT_SCNHDR_NRELOC(ABFD,VAL,PTR) \
 191 (COFF2_P(ABFD) ? bfd_h_put_32 (ABFD,VAL,PTR) : bfd_h_put_16 (ABFD,VAL,PTR))
 192 #define GET_SCNHDR_NLNNO(ABFD,PTR) \
 193 (COFF2_P(ABFD) ? bfd_h_get_32 (ABFD,PTR) : bfd_h_get_16 (ABFD, (PTR)-2))
 194 #define PUT_SCNHDR_NLNNO(ABFD,VAL,PTR) \
 195 (COFF2_P(ABFD) ? bfd_h_put_32 (ABFD,VAL,PTR) : bfd_h_put_16 (ABFD,VAL,(PTR)-2))
 196 #define GET_SCNHDR_FLAGS(ABFD,PTR) \
 197 (COFF2_P(ABFD) ? bfd_h_get_32 (ABFD,PTR) : bfd_h_get_16 (ABFD, (PTR)-4))
 198 #define PUT_SCNHDR_FLAGS(ABFD,VAL,PTR) \
 199 (COFF2_P(ABFD) ? bfd_h_put_32 (ABFD,VAL,PTR) : bfd_h_put_16 (ABFD,VAL,(PTR)-4))
 200 #define GET_SCNHDR_PAGE(ABFD,PTR) \
 201 (COFF2_P(ABFD) ? bfd_h_get_16 (ABFD,PTR) : bfd_h_get_8 (ABFD, (PTR)-7))
 202 /* on output, make sure that the "reserved" field is zero */
 203 #define PUT_SCNHDR_PAGE(ABFD,VAL,PTR) \
 204 (COFF2_P(ABFD) ? bfd_h_put_16 (ABFD,VAL,PTR) : \
 205 bfd_h_put_8 (ABFD,VAL,(PTR)-7), bfd_h_put_8 (ABFD, 0, (PTR)-8))
 206
 207 /* TI COFF stores section size as number of bytes (address units, not octets),
 208    so adjust to be number of octets, which is what BFD expects */
 209 #define GET_SCNHDR_SIZE(ABFD,SZP) \
 210 (bfd_h_get_32(ABFD,SZP)*bfd_octets_per_byte(ABFD))
 211 #define PUT_SCNHDR_SIZE(ABFD,SZ,SZP) \
 212 bfd_h_put_32(ABFD,(SZ)/bfd_octets_per_byte(ABFD),SZP)
 213
 214 #define COFF_ADJUST_SCNHDR_IN_POST(ABFD,EXT,INT) \
 215 do { ((struct internal_scnhdr *)(INT))->s_page = \
 216 GET_SCNHDR_PAGE(ABFD,(bfd_byte *)((SCNHDR *)(EXT))->s_page); \
 217 } while(0)
 218
 219 /* The line number and reloc overflow checking in coff_swap_scnhdr_out in
 220    coffswap.h doesn't use PUT_X for s_nlnno and s_nreloc.
 221    Due to different sized v0/v1/v2 section headers, we have to re-write these
 222    fields.
 223  */
 224 #define COFF_ADJUST_SCNHDR_OUT_POST(ABFD,INT,EXT) \
 225 do { \
 226 PUT_SCNHDR_NLNNO(ABFD,((struct internal_scnhdr *)(INT))->s_nlnno,\
 227                 (bfd_byte *)((SCNHDR *)(EXT))->s_nlnno); \
 228 PUT_SCNHDR_NRELOC(ABFD,((struct internal_scnhdr *)(INT))->s_nreloc,\
 229                 (bfd_byte *)((SCNHDR *)(EXT))->s_nreloc); \
 230 PUT_SCNHDR_FLAGS(ABFD,((struct internal_scnhdr *)(INT))->s_flags, \
 231                 (bfd_byte *)((SCNHDR *)(EXT))->s_flags); \
 232 PUT_SCNHDR_PAGE(ABFD,((struct internal_scnhdr *)(INT))->s_page, \
 233                 (bfd_byte *)((SCNHDR *)(EXT))->s_page); \
 234 } while(0)
 235
 236 /* page macros
 237
 238    the first GDB port requires flags in its remote memory access commands to
 239    distinguish between data/prog space.  hopefully we can make this go away
 240    eventually.  stuff the page in the upper bits of a 32-bit address, since
 241    the c5x family only uses 16 or 23 bits.
 242
 243    c2x, c5x and most c54x devices have 16-bit addresses, but the c548 has
 244    23-bit program addresses.  make sure the page flags don't interfere
 245    These flags are used by GDB to identify the destination page for
 246    addresses.
 247 */
 248
 249 #define LONG_ADDRESSES  1
 250 #define PG_SHIFT        (LONG_ADDRESSES ? 30 : 16)
 251 #define ADDR_MASK       ((1ul<<PG_SHIFT)-1)/* 16 or 24-bit addresses */
 252 #define PG_MASK         (3ul<<PG_SHIFT)
 253 #define PG_TO_FLAG(p)   ((p)<<PG_SHIFT)
 254 #define FLAG_TO_PG(f)   (((f)&PG_MASK)>>PG_SHIFT)
 255
 256 /*
 257  * names of "special" sections
 258  */
 259 #define _TEXT   ".text"
 260 #define _DATA   ".data"
 261 #define _BSS    ".bss"
 262 #define _CINIT  ".cinit"            /* initialized C data */
 263 #define _SCONST  ".const"           /* constants */
 264 #define _SWITCH ".switch"           /* switch tables */
 265 #define _STACK  ".stack"            /* C stack */
 266 #define _SYSMEM ".sysmem"           /* used for malloc et al. syscalls */
 267
 268 /********************** LINE NUMBERS **********************/
 269
 270 /* 1 line number entry for every "breakpointable" source line in a section.
 271  * Line numbers are grouped on a per function basis; first entry in a function
 272  * grouping will have l_lnno = 0 and in place of physical address will be the
 273  * symbol table index of the function name.
 274  */
 275 struct external_lineno {
 276   union {
 277     char l_symndx[4];   /* function name symbol index, iff l_lnno == 0*/
 278     char l_paddr[4];    /* (physical) address of line number    */
 279   } l_addr;
 280   char l_lnno[2];       /* line number          */
 281 };
 282
 283 #define LINENO  struct external_lineno
 284 #define LINESZ  6
 285
 286
 287 /********************** SYMBOLS **********************/
 288
 289 /* NOTE: this is what a local label looks like in assembly source; what it
 290    looks like in COFF output is undefined */
 291 #define TICOFF_LOCAL_LABEL_P(NAME) \
 292 ((NAME[0] == '$' && NAME[1] >= '0' && NAME[1] <= '9' && NAME[2] == '\0') \
 293  || NAME[strlen(NAME)-1] == '?')
 294
 295 #define E_SYMNMLEN      8       /* # characters in a symbol name        */
 296 #define E_FILNMLEN      14      /* # characters in a file name          */
 297 #define E_DIMNUM        4       /* # array dimensions in auxiliary entry */
 298
 299 struct external_syment
 300 {
 301   union {
 302     char e_name[E_SYMNMLEN];
 303     struct {
 304       char e_zeroes[4];
 305       char e_offset[4];
 306     } e;
 307   } e;
 308   char e_value[4];
 309   char e_scnum[2];
 310   char e_type[2];
 311   char e_sclass[1];
 312   char e_numaux[1];
 313 };
 314
 315
 316 #define N_BTMASK        (017)
 317 #define N_TMASK         (060)
 318 #define N_BTSHFT        (4)
 319 #define N_TSHIFT        (2)
 320
 321
 322 union external_auxent {
 323   struct {
 324         char x_tagndx[4];       /* str, un, or enum tag indx */
 325         union {
 326           struct {
 327                 char  x_lnno[2]; /* declaration line number */
 328                 char  x_size[2]; /* str/union/array size */
 329           } x_lnsz;
 330           char x_fsize[4];      /* size of function */
 331         } x_misc;
 332         union {
 333           struct {              /* if ISFCN, tag, or .bb */
 334                 char x_lnnoptr[4];      /* ptr to fcn line # */
 335                 char x_endndx[4];       /* entry ndx past block end */
 336           } x_fcn;
 337           struct {              /* if ISARY, up to 4 dimen. */
 338                 char x_dimen[E_DIMNUM][2];
 339           } x_ary;
 340         } x_fcnary;
 341         char x_tvndx[2];                /* tv index */
 342   } x_sym;
 343
 344   union {
 345         char x_fname[E_FILNMLEN];
 346         struct {
 347           char x_zeroes[4];
 348           char x_offset[4];
 349         } x_n;
 350   } x_file;
 351
 352   struct {
 353         char x_scnlen[4];                       /* section length */
 354         char x_nreloc[2];       /* # relocation entries */
 355         char x_nlinno[2];       /* # line numbers */
 356   } x_scn;
 357
 358   struct {
 359         char x_tvfill[4];       /* tv fill value */
 360         char x_tvlen[2];        /* length of .tv */
 361         char x_tvran[2][2];     /* tv range */
 362   } x_tv;               /* info about .tv section (in auxent of symbol .tv)) */
 363
 364
 365 };
 366
 367 #define SYMENT  struct external_syment
 368 #define SYMESZ  18
 369 #define AUXENT  union external_auxent
 370 #define AUXESZ  18
 371
 372 /* section lengths are in target bytes (not host bytes) */
 373 #define GET_SCN_SCNLEN(ABFD,EXT) \
 374 (bfd_h_get_32(ABFD,(bfd_byte *)(EXT)->x_scn.x_scnlen)*bfd_octets_per_byte(ABFD))
 375 #define PUT_SCN_SCNLEN(ABFD,INT,EXT) \
 376 bfd_h_put_32(ABFD,(INT)/bfd_octets_per_byte(ABFD),\
 377              (bfd_byte *)(EXT)->x_scn.x_scnlen)
 378
 379 /* lnsz size is in bits in COFF file, in bytes in BFD */
 380 #define GET_LNSZ_SIZE(abfd, ext) \
 381 (bfd_h_get_16(abfd, (bfd_byte *)ext->x_sym.x_misc.x_lnsz.x_size) / \
 382  (class != C_FIELD ? 8 : 1))
 383
 384 #define PUT_LNSZ_SIZE(abfd, in, ext) \
 385  bfd_h_put_16(abfd, ((class != C_FIELD) ? (in)*8 : (in)), \
 386               (bfd_byte*) ext->x_sym.x_misc.x_lnsz.x_size)
 387
 388 /* TI COFF stores offsets for MOS and MOU in bits; BFD expects bytes */
 389 #define COFF_ADJUST_SYM_IN_POST(ABFD,EXT,INT) \
 390 do { struct internal_syment *dst = (struct internal_syment *)(INT); \
 391 if (dst->n_sclass == C_MOS || dst->n_sclass == C_MOU) dst->n_value /= 8; \
 392 } while (0)
 393
 394 #define COFF_ADJUST_SYM_OUT_POST(ABFD,INT,EXT) \
 395 do { struct internal_syment *src = (struct internal_syment *)(INT); \
 396 SYMENT *dst = (SYMENT *)(EXT); \
 397 if(src->n_sclass == C_MOU || src->n_sclass == C_MOS) \
 398 bfd_h_put_32(abfd,src->n_value * 8,(bfd_byte *)dst->e_value); \
 399 } while (0)
 400
 401 /* Detect section-relative absolute symbols so they get flagged with a sym
 402    index of -1.
 403 */
 404 #define SECTION_RELATIVE_ABSOLUTE_SYMBOL_P(RELOC,SECT) \
 405 ((*(RELOC)->sym_ptr_ptr)->section->output_section == (SECT) \
 406  && (RELOC)->howto->name[0] == 'A')
 407
 408 /********************** RELOCATION DIRECTIVES **********************/
 409
 410 struct external_reloc_v0 {
 411   char r_vaddr[4];
 412   char r_symndx[2];
 413   char r_reserved[2];
 414   char r_type[2];
 415 };
 416
 417 struct external_reloc {
 418   char r_vaddr[4];
 419   char r_symndx[4];
 420   char r_reserved[2]; /* extended pmad byte for COFF2 */
 421   char r_type[2];
 422 };
 423
 424 #define RELOC struct external_reloc
 425 #define RELSZ_V0 10                 /* FIXME -- coffcode.h needs fixing */
 426 #define RELSZ 12                    /* for COFF1/2 */
 427
 428 /* various relocation types.  */
 429 #define R_ABS     0x0000            /* no relocation */
 430 #define R_REL13   0x002A            /* 13-bit direct reference (???) */
 431 #define R_PARTLS7 0x0028            /* 7 LSBs of an address */
 432 #define R_PARTMS9 0x0029            /* 9MSBs of an address */
 433 #define R_EXTWORD 0x002B            /* 23-bit direct reference */
 434 #define R_EXTWORD16 0x002C          /* 16-bit direct reference to 23-bit addr*/
 435 #define R_EXTWORDMS7 0x002D         /* upper 7 bits of 23-bit address */
 436
 437 #endif /* COFF_TI_H */