Subversion Repositories openrisc_2011-10-31

/* COFF information for TI COFF support.  Definitions in this file should be

   customized in a target-specific file, and then this file included (see

   tic54x.h for an example).

   Copyright 2000, 2001, 2002, 2003 Free Software Foundation, Inc.

   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, write to the Free Software

   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, USA.  */

#ifndef COFF_TI_H

#define COFF_TI_H

/* Note "coff/external.h is not used because TI adds extra fields to the structures.  */

/********************** FILE HEADER **********************/

struct external_filehdr

  {

    char f_magic[2];    /* magic number                 */

    char f_nscns[2];    /* number of sections           */

    char f_timdat[4];   /* time & date stamp            */

    char f_symptr[4];   /* file pointer to symtab       */

    char f_nsyms[4];    /* number of symtab entries     */

    char f_opthdr[2];   /* sizeof(optional hdr)         */

    char f_flags[2];    /* flags                        */

    char f_target_id[2];    /* magic no. (TI COFF-specific) */

  };

/* COFF0 has magic number in f_magic, and omits f_target_id from the file

   header; for later versions, f_magic is 0xC1 for COFF1 and 0xC2 for COFF2

   and the target-specific magic number is found in f_target_id */

#define TICOFF0MAGIC    TI_TARGET_ID

#define TICOFF1MAGIC    0x00C1

#define TICOFF2MAGIC    0x00C2

#define TICOFF_AOUT_MAGIC    0x0108 /* magic number in optional header */

#define TICOFF          1 /* customize coffcode.h */

/* The target_id field changes depending on the particular CPU target */

/* for COFF0, the target id appeared in f_magic, where COFFX magic is now */

#ifndef TI_TARGET_ID

#error "TI_TARGET_ID needs to be defined for your CPU"

#endif

/* Which bfd_arch to use... */

#ifndef TICOFF_TARGET_ARCH

#error "TICOFF_TARGET_ARCH needs to be defined for your CPU"

#endif

#ifndef TICOFF_TARGET_MACHINE_GET

#define TICOFF_TARGET_MACHINE_GET(FLAGS) 0

#endif

#ifndef TICOFF_TARGET_MACHINE_SET

#define TICOFF_TARGET_MACHINE_SET(FLAGSP, MACHINE)

#endif

/* Default to COFF2 for file output */

#ifndef TICOFF_DEFAULT_MAGIC

#define TICOFF_DEFAULT_MAGIC TICOFF2MAGIC

#endif

/* This value is made available in the rare case where a bfd is unavailable */

#ifndef OCTETS_PER_BYTE_POWER

#error "OCTETS_PER_BYTE_POWER not defined for this CPU"

#else

#define OCTETS_PER_BYTE (1<<OCTETS_PER_BYTE_POWER)

#endif

/* default alignment is on a byte (not octet!) boundary */

#ifndef COFF_DEFAULT_SECTION_ALIGNMENT_POWER

#define COFF_DEFAULT_SECTION_ALIGNMENT_POWER 0

#endif

/* TI COFF encodes the section alignment in the section header flags */

#define COFF_ALIGN_IN_SECTION_HEADER 1

#define COFF_ALIGN_IN_S_FLAGS 1

/* requires a power-of-two argument */

#define COFF_ENCODE_ALIGNMENT(S,X) ((S).s_flags |= (((unsigned)(X)&0xF)<<8))

/* result is a power of two */

#define COFF_DECODE_ALIGNMENT(X) (((X)>>8)&0xF)

#define COFF0_P(ABFD) (bfd_coff_filhsz(ABFD) == FILHSZ_V0)

#define COFF2_P(ABFD) (bfd_coff_scnhsz(ABFD) != SCNHSZ_V01)

#define COFF0_BADMAG(x) ((x).f_magic != TICOFF0MAGIC)

#define COFF1_BADMAG(x) ((x).f_magic != TICOFF1MAGIC || (x).f_target_id != TI_TARGET_ID)

#define COFF2_BADMAG(x) ((x).f_magic != TICOFF2MAGIC || (x).f_target_id != TI_TARGET_ID)

/* we need to read/write an extra field in the coff file header */

#ifndef COFF_ADJUST_FILEHDR_IN_POST

#define COFF_ADJUST_FILEHDR_IN_POST(abfd, src, dst) \

  do                                                                    \

    {                                                                   \

      ((struct internal_filehdr *)(dst))->f_target_id =                 \

        H_GET_16 (abfd, ((FILHDR *)(src))->f_target_id);                \

    }                                                                   \

  while (0)

#endif

#ifndef COFF_ADJUST_FILEHDR_OUT_POST

#define COFF_ADJUST_FILEHDR_OUT_POST(abfd, src, dst) \

  do                                                                    \

    {                                                                   \

      H_PUT_16 (abfd, ((struct internal_filehdr *)(src))->f_target_id,  \

               ((FILHDR *)(dst))->f_target_id);                         \

    }                                                                   \

  while (0)

#endif

#define FILHDR  struct external_filehdr

#define FILHSZ  22

#define FILHSZ_V0 20                /* COFF0 omits target_id field */

/* File header flags */

#define F_RELFLG        (0x0001)

#define F_EXEC          (0x0002)

#define F_LNNO          (0x0004)

#define F_VERS          (0x0010) /* TMS320C4x code */

/* F_LSYMS needs to be redefined in your source file */

#define F_LSYMS_TICOFF  (0x0010) /* normal COFF is 0x8 */

#define F_10            0x00    /* file built for TMS320C1x devices */

#define F_20            0x10    /* file built for TMS320C2x devices */

#define F_25            0x20    /* file built for TMS320C2x/C5x devices */

#define F_LENDIAN       0x0100  /* 16 bits/word, LSB first */

#define F_SYMMERGE      0x1000  /* duplicate symbols were removed */

/********************** OPTIONAL HEADER **********************/

typedef struct

{

  char  magic[2];               /* type of file (0x108)                 */

  char  vstamp[2];              /* version stamp                        */

  char  tsize[4];               /* text size in bytes, padded to FW bdry*/

  char  dsize[4];               /* initialized data "  "                */

  char  bsize[4];               /* uninitialized data "   "             */

  char  entry[4];               /* entry pt.                            */

  char  text_start[4];          /* base of text used for this file */

  char  data_start[4];          /* base of data used for this file */

}

AOUTHDR;

#define AOUTHDRSZ 28

#define AOUTSZ 28

/********************** SECTION HEADER **********************/

/* COFF0, COFF1 */

struct external_scnhdr_v01 {

        char            s_name[8];      /* section name                 */

        char            s_paddr[4];     /* physical address, aliased s_nlib */

        char            s_vaddr[4];     /* virtual address              */

        char            s_size[4];      /* section size (in WORDS)      */

        char            s_scnptr[4];    /* file ptr to raw data for section */

        char            s_relptr[4];    /* file ptr to relocation       */

        char            s_lnnoptr[4];   /* file ptr to line numbers     */

        char            s_nreloc[2];    /* number of relocation entries */

        char            s_nlnno[2];     /* number of line number entries*/

        char            s_flags[2];     /* flags                        */

        char            s_reserved[1];  /* reserved                     */

        char            s_page[1];      /* section page number (LOAD)   */

};

/* COFF2 */

struct external_scnhdr {

        char            s_name[8];      /* section name                 */

        char            s_paddr[4];     /* physical address, aliased s_nlib */

        char            s_vaddr[4];     /* virtual address              */

        char            s_size[4];      /* section size (in WORDS)      */

        char            s_scnptr[4];    /* file ptr to raw data for section */

        char            s_relptr[4];    /* file ptr to relocation       */

        char            s_lnnoptr[4];   /* file ptr to line numbers     */

        char            s_nreloc[4];    /* number of relocation entries */

        char            s_nlnno[4];     /* number of line number entries*/

        char            s_flags[4];     /* flags                        */

        char            s_reserved[2];  /* reserved                     */

        char            s_page[2];      /* section page number (LOAD)   */

};

/*

 * Special section flags

 */

/* TI COFF defines these flags;

   STYP_CLINK: the section should be excluded from the final

   linker output if there are no references found to any symbol in the section

   STYP_BLOCK: the section should be blocked, i.e. if the section would cross

   a page boundary, it is started at a page boundary instead.

   TI COFF puts the section alignment power of two in the section flags

   e.g. 2**N is alignment, flags |= (N & 0xF) << 8

*/

#define STYP_CLINK      (0x4000)

#define STYP_BLOCK      (0x1000)

#define STYP_ALIGN      (0x0F00) /* TI COFF stores section alignment here */

#define SCNHDR_V01 struct external_scnhdr_v01

#define SCNHDR struct external_scnhdr

#define SCNHSZ_V01 40                  /* for v0 and v1 */

#define SCNHSZ 48

/* COFF2 changes the offsets and sizes of these fields

   Assume we're dealing with the COFF2 scnhdr structure, and adjust

   accordingly

 */

#define GET_SCNHDR_NRELOC(ABFD, LOC) \

  (COFF2_P (ABFD) ? H_GET_32 (ABFD, LOC) : H_GET_16 (ABFD, LOC))

#define PUT_SCNHDR_NRELOC(ABFD, VAL, LOC) \

  (COFF2_P (ABFD) ? H_PUT_32 (ABFD, VAL, LOC) : H_PUT_16 (ABFD, VAL, LOC))

#define GET_SCNHDR_NLNNO(ABFD, LOC) \

  (COFF2_P (ABFD) ? H_GET_32 (ABFD, LOC) : H_GET_16 (ABFD, (LOC) - 2))

#define PUT_SCNHDR_NLNNO(ABFD, VAL, LOC) \

  (COFF2_P (ABFD) ? H_PUT_32 (ABFD, VAL, LOC) : H_PUT_16 (ABFD, VAL, (LOC) - 2))

#define GET_SCNHDR_FLAGS(ABFD, LOC) \

  (COFF2_P (ABFD) ? H_GET_32 (ABFD, LOC) : H_GET_16 (ABFD, (LOC) - 4))

#define PUT_SCNHDR_FLAGS(ABFD, VAL, LOC) \

  (COFF2_P (ABFD) ? H_PUT_32 (ABFD, VAL, LOC) : H_PUT_16 (ABFD, VAL, (LOC) - 4))

#define GET_SCNHDR_PAGE(ABFD, LOC) \

  (COFF2_P (ABFD) ? H_GET_16 (ABFD, LOC) : (unsigned) H_GET_8 (ABFD, (LOC) - 7))

/* on output, make sure that the "reserved" field is zero */

#define PUT_SCNHDR_PAGE(ABFD, VAL, LOC) \

  (COFF2_P (ABFD) \

   ? H_PUT_16 (ABFD, VAL, LOC) \

   : H_PUT_8 (ABFD, VAL, (LOC) - 7), H_PUT_8 (ABFD, 0, (LOC) - 8))

/* TI COFF stores section size as number of bytes (address units, not octets),

   so adjust to be number of octets, which is what BFD expects */

#define GET_SCNHDR_SIZE(ABFD, SZP) \

  (H_GET_32 (ABFD, SZP) * bfd_octets_per_byte (ABFD))

#define PUT_SCNHDR_SIZE(ABFD, SZ, SZP) \

  H_PUT_32 (ABFD, (SZ) / bfd_octets_per_byte (ABFD), SZP)

#define COFF_ADJUST_SCNHDR_IN_POST(ABFD, EXT, INT) \

  do                                                                    \

    {                                                                   \

      ((struct internal_scnhdr *)(INT))->s_page =                       \

        GET_SCNHDR_PAGE (ABFD, ((SCNHDR *)(EXT))->s_page);              \

    }                                                                   \

   while (0)

/* The line number and reloc overflow checking in coff_swap_scnhdr_out in

   coffswap.h doesn't use PUT_X for s_nlnno and s_nreloc.

   Due to different sized v0/v1/v2 section headers, we have to re-write these

   fields.

 */

#define COFF_ADJUST_SCNHDR_OUT_POST(ABFD, INT, EXT) \

  do                                                                       \

    {                                                                      \

      PUT_SCNHDR_NLNNO (ABFD, ((struct internal_scnhdr *)(INT))->s_nlnno,  \

                        ((SCNHDR *)(EXT))->s_nlnno);                       \

      PUT_SCNHDR_NRELOC (ABFD, ((struct internal_scnhdr *)(INT))->s_nreloc,\

                         ((SCNHDR *)(EXT))->s_nreloc);                     \

      PUT_SCNHDR_FLAGS (ABFD, ((struct internal_scnhdr *)(INT))->s_flags,  \

                        ((SCNHDR *)(EXT))->s_flags);                       \

      PUT_SCNHDR_PAGE (ABFD, ((struct internal_scnhdr *)(INT))->s_page,    \

                       ((SCNHDR *)(EXT))->s_page);                         \

    }                                                                      \

   while (0)

/*

 * names of "special" sections

 */

#define _TEXT   ".text"

#define _DATA   ".data"

#define _BSS    ".bss"

#define _CINIT  ".cinit"            /* initialized C data */

#define _SCONST  ".const"           /* constants */

#define _SWITCH ".switch"           /* switch tables */

#define _STACK  ".stack"            /* C stack */

#define _SYSMEM ".sysmem"           /* used for malloc et al. syscalls */

/********************** LINE NUMBERS **********************/

/* 1 line number entry for every "breakpointable" source line in a section.

 * Line numbers are grouped on a per function basis; first entry in a function

 * grouping will have l_lnno = 0 and in place of physical address will be the

 * symbol table index of the function name.

 */

struct external_lineno {

  union {

    char l_symndx[4];   /* function name symbol index, iff l_lnno == 0*/

    char l_paddr[4];    /* (physical) address of line number    */

  } l_addr;

  char l_lnno[2];       /* line number          */

};

#define LINENO  struct external_lineno

#define LINESZ  6

/********************** SYMBOLS **********************/

/* NOTE: this is what a local label looks like in assembly source; what it

   looks like in COFF output is undefined */

#define TICOFF_LOCAL_LABEL_P(NAME) \

((NAME[0] == '$' && NAME[1] >= '0' && NAME[1] <= '9' && NAME[2] == '\0') \

 || NAME[strlen(NAME)-1] == '?')

#define E_SYMNMLEN      8       /* # characters in a symbol name        */

#define E_FILNMLEN      14      /* # characters in a file name          */

#define E_DIMNUM        4       /* # array dimensions in auxiliary entry */

struct external_syment

{

  union {

    char e_name[E_SYMNMLEN];

    struct {

      char e_zeroes[4];

      char e_offset[4];

    } e;

  } e;

  char e_value[4];

  char e_scnum[2];

  char e_type[2];

  char e_sclass[1];

  char e_numaux[1];

};

#define N_BTMASK        (017)

#define N_TMASK         (060)

#define N_BTSHFT        (4)

#define N_TSHIFT        (2)

union external_auxent {

  struct {

        char x_tagndx[4];       /* str, un, or enum tag indx */

        union {

          struct {

                char  x_lnno[2]; /* declaration line number */

                char  x_size[2]; /* str/union/array size */

          } x_lnsz;

          char x_fsize[4];      /* size of function */

        } x_misc;

        union {

          struct {              /* if ISFCN, tag, or .bb */

                char x_lnnoptr[4];      /* ptr to fcn line # */

                char x_endndx[4];       /* entry ndx past block end */

          } x_fcn;

          struct {              /* if ISARY, up to 4 dimen. */

                char x_dimen[E_DIMNUM][2];

          } x_ary;

        } x_fcnary;

        char x_tvndx[2];                /* tv index */

  } x_sym;

  union {

        char x_fname[E_FILNMLEN];

        struct {

          char x_zeroes[4];

          char x_offset[4];

        } x_n;

  } x_file;

  struct {

        char x_scnlen[4];                       /* section length */

        char x_nreloc[2];       /* # relocation entries */

        char x_nlinno[2];       /* # line numbers */

  } x_scn;

  struct {

        char x_tvfill[4];       /* tv fill value */

        char x_tvlen[2];        /* length of .tv */

        char x_tvran[2][2];     /* tv range */

  } x_tv;               /* info about .tv section (in auxent of symbol .tv)) */

};

#define SYMENT  struct external_syment

#define SYMESZ  18      

#define AUXENT  union external_auxent

#define AUXESZ  18

/* section lengths are in target bytes (not host bytes) */

#define GET_SCN_SCNLEN(ABFD, EXT) \

  (H_GET_32 (ABFD, (EXT)->x_scn.x_scnlen) * bfd_octets_per_byte (ABFD))

#define PUT_SCN_SCNLEN(ABFD, INT, EXT) \

  H_PUT_32 (ABFD, (INT) / bfd_octets_per_byte (ABFD), (EXT)->x_scn.x_scnlen)

/* lnsz size is in bits in COFF file, in bytes in BFD */

#define GET_LNSZ_SIZE(abfd, ext) \

 (H_GET_16 (abfd, ext->x_sym.x_misc.x_lnsz.x_size) / (class != C_FIELD ? 8 : 1))

#define PUT_LNSZ_SIZE(abfd, in, ext) \

  H_PUT_16 (abfd, ((class != C_FIELD) ? (in) * 8 : (in)), \

           ext->x_sym.x_misc.x_lnsz.x_size)

/* TI COFF stores offsets for MOS and MOU in bits; BFD expects bytes

   Also put the load page flag of the section into the symbol value if it's an

   address.  */

#ifndef NEEDS_PAGE

#define NEEDS_PAGE(X) 0

#define PAGE_MASK 0

#endif

#define COFF_ADJUST_SYM_IN_POST(ABFD, EXT, INT) \

  do                                                                    \

    {                                                                   \

      struct internal_syment *dst = (struct internal_syment *)(INT);    \

      if (dst->n_sclass == C_MOS || dst->n_sclass == C_MOU)             \

        dst->n_value /= 8;                                              \

      else if (NEEDS_PAGE (dst->n_sclass)) {                            \

        asection *scn = coff_section_from_bfd_index (abfd, dst->n_scnum); \

        dst->n_value |= (scn->lma & PAGE_MASK);                         \

      }                                                                 \

    }                                                                   \

   while (0)

#define COFF_ADJUST_SYM_OUT_POST(ABFD, INT, EXT) \

  do                                                                    \

    {                                                                   \

       struct internal_syment *src = (struct internal_syment *)(INT);   \

       SYMENT *dst = (SYMENT *)(EXT);                                   \

       if (src->n_sclass == C_MOU || src->n_sclass == C_MOS)            \

         H_PUT_32 (abfd, src->n_value * 8, dst->e_value);               \

       else if (NEEDS_PAGE (src->n_sclass)) {                           \

         H_PUT_32 (abfd, src->n_value &= ~PAGE_MASK, dst->e_value);     \

       }                                                                \

    }                                                                   \

   while (0)

/* Detect section-relative absolute symbols so they get flagged with a sym

   index of -1.

*/

#define SECTION_RELATIVE_ABSOLUTE_SYMBOL_P(RELOC, SECT) \

  ((*(RELOC)->sym_ptr_ptr)->section->output_section == (SECT) \

   && (RELOC)->howto->name[0] == 'A')

/********************** RELOCATION DIRECTIVES **********************/

struct external_reloc_v0

{

  char r_vaddr[4];

  char r_symndx[2];

  char r_reserved[2];

  char r_type[2];

};

struct external_reloc

{

  char r_vaddr[4];

  char r_symndx[4];

  char r_reserved[2]; /* extended pmad byte for COFF2 */

  char r_type[2];

};

#define RELOC struct external_reloc

#define RELSZ_V0 10                 /* FIXME -- coffcode.h needs fixing */

#define RELSZ 12                    /* for COFF1/2 */

/* various relocation types.  */

#define R_ABS     0x0000            /* no relocation */

#define R_REL13   0x002A            /* 13-bit direct reference (???) */

#define R_PARTLS7 0x0028            /* 7 LSBs of an address */

#define R_PARTMS9 0x0029            /* 9MSBs of an address */

#define R_EXTWORD 0x002B            /* 23-bit direct reference */

#define R_EXTWORD16 0x002C          /* 16-bit direct reference to 23-bit addr*/

#define R_EXTWORDMS7 0x002D         /* upper 7 bits of 23-bit address */

#endif /* COFF_TI_H */