Subversion Repositories openrisc_2011-10-31

/* Generic ECOFF support.

   This does not include symbol information, found in sym.h and

   symconst.h.

   Copyright 2001, 2002, 2003, 2004, 2005 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 ECOFF_H

#define ECOFF_H

/* Mips magic numbers used in filehdr.  MIPS_MAGIC_LITTLE is used on

   little endian machines.  MIPS_MAGIC_BIG is used on big endian

   machines.  Where is MIPS_MAGIC_1 from?  */

#define MIPS_MAGIC_1 0x0180

#define MIPS_MAGIC_LITTLE 0x0162

#define MIPS_MAGIC_BIG 0x0160

/* These are the magic numbers used for MIPS code compiled at ISA

   level 2.  */

#define MIPS_MAGIC_LITTLE2 0x0166

#define MIPS_MAGIC_BIG2 0x0163

/* These are the magic numbers used for MIPS code compiled at ISA

   level 3.  */

#define MIPS_MAGIC_LITTLE3 0x142

#define MIPS_MAGIC_BIG3 0x140

/* Alpha magic numbers used in filehdr.  */

#define ALPHA_MAGIC 0x183

#define ALPHA_MAGIC_BSD 0x185

/* A compressed version of an ALPHA_MAGIC file created by DEC's tools.  */

#define ALPHA_MAGIC_COMPRESSED 0x188

/* Magic numbers used in a.out header.  */

#define ECOFF_AOUT_OMAGIC 0407  /* not demand paged (ld -N).  */

#define ECOFF_AOUT_ZMAGIC 0413  /* demand load format, eg normal ld output */

/* Names of special sections.  */

#define _TEXT   ".text"

#define _DATA   ".data"

#define _BSS    ".bss"

#define _RDATA  ".rdata"

#define _SDATA  ".sdata"

#define _SBSS   ".sbss"

#define _LITA   ".lita"

#define _LIT4   ".lit4"

#define _LIT8   ".lit8"

#define _LIB    ".lib"

#define _INIT   ".init"

#define _FINI   ".fini"

#define _PDATA  ".pdata"

#define _XDATA  ".xdata"

#define _GOT    ".got"

#define _HASH   ".hash"

#define _DYNSYM ".dynsym"

#define _DYNSTR ".dynstr"

#define _RELDYN ".rel.dyn"

#define _CONFLIC ".conflic"

#define _COMMENT ".comment"

#define _LIBLIST ".liblist"

#define _DYNAMIC ".dynamic"

#define _RCONST ".rconst"

/* ECOFF uses some additional section flags.  */

#define STYP_RDATA           0x100

#define STYP_SDATA           0x200

#define STYP_SBSS            0x400

#define STYP_GOT            0x1000

#define STYP_DYNAMIC        0x2000

#define STYP_DYNSYM         0x4000

#define STYP_RELDYN         0x8000

#define STYP_DYNSTR        0x10000

#define STYP_HASH          0x20000

#define STYP_LIBLIST       0x40000

#define STYP_CONFLIC      0x100000

#define STYP_ECOFF_FINI  0x1000000

#define STYP_EXTENDESC   0x2000000 /* 0x02FFF000 bits => scn type, rest clr */

#define STYP_LITA        0x4000000

#define STYP_LIT8        0x8000000

#define STYP_LIT4       0x10000000

#define STYP_ECOFF_LIB  0x40000000

#define STYP_ECOFF_INIT 0x80000000

#define STYP_OTHER_LOAD (STYP_ECOFF_INIT | STYP_ECOFF_FINI)

/* extended section types */

#define STYP_COMMENT     0x2100000

#define STYP_RCONST      0x2200000

#define STYP_XDATA       0x2400000

#define STYP_PDATA       0x2800000

/* The linker needs a section to hold small common variables while

   linking.  There is no convenient way to create it when the linker

   needs it, so we always create one for each BFD.  We then avoid

   writing it out.  */

#define SCOMMON ".scommon"

/* If the extern bit in a reloc is 1, then r_symndx is an index into

   the external symbol table.  If the extern bit is 0, then r_symndx

   indicates a section, and is one of the following values.  */

#define RELOC_SECTION_NONE      0

#define RELOC_SECTION_TEXT      1

#define RELOC_SECTION_RDATA     2

#define RELOC_SECTION_DATA      3

#define RELOC_SECTION_SDATA     4

#define RELOC_SECTION_SBSS      5

#define RELOC_SECTION_BSS       6

#define RELOC_SECTION_INIT      7

#define RELOC_SECTION_LIT8      8

#define RELOC_SECTION_LIT4      9

#define RELOC_SECTION_XDATA    10

#define RELOC_SECTION_PDATA    11

#define RELOC_SECTION_FINI     12

#define RELOC_SECTION_LITA     13

#define RELOC_SECTION_ABS      14

#define RELOC_SECTION_RCONST   15

#define NUM_RELOC_SECTIONS     16

/********************** STABS **********************/

/* gcc uses mips-tfile to output type information in special stabs

   entries.  These must match the corresponding definition in

   gcc/config/mips.h.  At some point, these should probably go into a

   shared include file, but currently gcc and gdb do not share any

   directories. */

#define CODE_MASK 0x8F300

#define ECOFF_IS_STAB(sym) (((sym)->index & 0xFFF00) == CODE_MASK)

#define ECOFF_MARK_STAB(code) ((code)+CODE_MASK)

#define ECOFF_UNMARK_STAB(code) ((code)-CODE_MASK)

#define STABS_SYMBOL "@stabs"

/********************** COFF **********************/

/* gcc also uses mips-tfile to output COFF debugging information.

   These are the values it uses when outputting the .type directive.

   These should also be in a shared include file.  */

#define N_BTMASK        (017)

#define N_TMASK         (060)

#define N_BTSHFT        (4)

#define N_TSHIFT        (2)

/********************** AUX **********************/

/* The auxiliary type information is the same on all known ECOFF

   targets.  I can't see any reason that it would ever change, so I am

   going to gamble and define the external structures here, in the

   target independent ECOFF header file.  The internal forms are

   defined in coff/sym.h, which was originally donated by MIPS

   Computer Systems.  */

/* Type information external record */

struct tir_ext {

        unsigned char   t_bits1[1];

        unsigned char   t_tq45[1];

        unsigned char   t_tq01[1];

        unsigned char   t_tq23[1];

};

#define TIR_BITS1_FBITFIELD_BIG         ((unsigned int) 0x80)

#define TIR_BITS1_FBITFIELD_LITTLE      ((unsigned int) 0x01)

#define TIR_BITS1_CONTINUED_BIG         ((unsigned int) 0x40)

#define TIR_BITS1_CONTINUED_LITTLE      ((unsigned int) 0x02)

#define TIR_BITS1_BT_BIG                ((unsigned int) 0x3F)

#define TIR_BITS1_BT_SH_BIG             0

#define TIR_BITS1_BT_LITTLE             ((unsigned int) 0xFC)

#define TIR_BITS1_BT_SH_LITTLE          2

#define TIR_BITS_TQ4_BIG                ((unsigned int) 0xF0)

#define TIR_BITS_TQ4_SH_BIG             4

#define TIR_BITS_TQ5_BIG                ((unsigned int) 0x0F)

#define TIR_BITS_TQ5_SH_BIG             0

#define TIR_BITS_TQ4_LITTLE             ((unsigned int) 0x0F)

#define TIR_BITS_TQ4_SH_LITTLE          0

#define TIR_BITS_TQ5_LITTLE             ((unsigned int) 0xF0)

#define TIR_BITS_TQ5_SH_LITTLE          4

#define TIR_BITS_TQ0_BIG                ((unsigned int) 0xF0)

#define TIR_BITS_TQ0_SH_BIG             4

#define TIR_BITS_TQ1_BIG                ((unsigned int) 0x0F)

#define TIR_BITS_TQ1_SH_BIG             0

#define TIR_BITS_TQ0_LITTLE             ((unsigned int) 0x0F)

#define TIR_BITS_TQ0_SH_LITTLE          0

#define TIR_BITS_TQ1_LITTLE             ((unsigned int) 0xF0)

#define TIR_BITS_TQ1_SH_LITTLE          4

#define TIR_BITS_TQ2_BIG                ((unsigned int) 0xF0)

#define TIR_BITS_TQ2_SH_BIG             4

#define TIR_BITS_TQ3_BIG                ((unsigned int) 0x0F)

#define TIR_BITS_TQ3_SH_BIG             0

#define TIR_BITS_TQ2_LITTLE             ((unsigned int) 0x0F)

#define TIR_BITS_TQ2_SH_LITTLE          0

#define TIR_BITS_TQ3_LITTLE             ((unsigned int) 0xF0)

#define TIR_BITS_TQ3_SH_LITTLE          4

/* Relative symbol external record */

struct rndx_ext {

        unsigned char   r_bits[4];

};

#define RNDX_BITS0_RFD_SH_LEFT_BIG      4

#define RNDX_BITS1_RFD_BIG              ((unsigned int) 0xF0)

#define RNDX_BITS1_RFD_SH_BIG           4

#define RNDX_BITS0_RFD_SH_LEFT_LITTLE   0

#define RNDX_BITS1_RFD_LITTLE           ((unsigned int) 0x0F)

#define RNDX_BITS1_RFD_SH_LEFT_LITTLE   8

#define RNDX_BITS1_INDEX_BIG            ((unsigned int) 0x0F)

#define RNDX_BITS1_INDEX_SH_LEFT_BIG    16

#define RNDX_BITS2_INDEX_SH_LEFT_BIG    8

#define RNDX_BITS3_INDEX_SH_LEFT_BIG    0

#define RNDX_BITS1_INDEX_LITTLE         ((unsigned int) 0xF0)

#define RNDX_BITS1_INDEX_SH_LITTLE      4

#define RNDX_BITS2_INDEX_SH_LEFT_LITTLE 4

#define RNDX_BITS3_INDEX_SH_LEFT_LITTLE 12

/* Auxiliary symbol information external record */

union aux_ext {

        struct tir_ext  a_ti;

        struct rndx_ext a_rndx;

        unsigned char   a_dnLow[4];

        unsigned char   a_dnHigh[4];

        unsigned char   a_isym[4];

        unsigned char   a_iss[4];

        unsigned char   a_width[4];

        unsigned char   a_count[4];

};

#define AUX_GET_ANY(bigend, ax, field) \

  ((bigend) ? bfd_getb32 ((ax)->field) : bfd_getl32 ((ax)->field))

#define AUX_GET_DNLOW(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_dnLow)

#define AUX_GET_DNHIGH(bigend, ax)      AUX_GET_ANY ((bigend), (ax), a_dnHigh)

#define AUX_GET_ISYM(bigend, ax)        AUX_GET_ANY ((bigend), (ax), a_isym)

#define AUX_GET_ISS(bigend, ax)         AUX_GET_ANY ((bigend), (ax), a_iss)

#define AUX_GET_WIDTH(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_width)

#define AUX_GET_COUNT(bigend, ax)       AUX_GET_ANY ((bigend), (ax), a_count)

#define AUX_PUT_ANY(bigend, val, ax, field) \

  ((bigend) \

   ? (bfd_putb32 ((bfd_vma) (val), (ax)->field), 0) \

   : (bfd_putl32 ((bfd_vma) (val), (ax)->field), 0))

#define AUX_PUT_DNLOW(bigend, val, ax) \

  AUX_PUT_ANY ((bigend), (val), (ax), a_dnLow)

#define AUX_PUT_DNHIGH(bigend, val, ax) \

  AUX_PUT_ANY ((bigend), (val), (ax), a_dnHigh)

#define AUX_PUT_ISYM(bigend, val, ax) \

  AUX_PUT_ANY ((bigend), (val), (ax), a_isym)

#define AUX_PUT_ISS(bigend, val, ax) \

  AUX_PUT_ANY ((bigend), (val), (ax), a_iss)

#define AUX_PUT_WIDTH(bigend, val, ax) \

  AUX_PUT_ANY ((bigend), (val), (ax), a_width)

#define AUX_PUT_COUNT(bigend, val, ax) \

  AUX_PUT_ANY ((bigend), (val), (ax), a_count)

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

/* For efficiency, gdb deals directly with the unswapped symbolic

   information (that way it only takes the time to swap information

   that it really needs to read).  gdb originally retrieved the

   information directly from the BFD backend information, but that

   strategy, besides being sort of ugly, does not work for MIPS ELF,

   which also uses ECOFF debugging information.  This structure holds

   pointers to the (mostly) unswapped symbolic information.  */

struct ecoff_debug_info

{

  /* The swapped ECOFF symbolic header.  */

  HDRR symbolic_header;

  /* Pointers to the unswapped symbolic information.  Note that the

     pointers to external structures point to different sorts of

     information on different ECOFF targets.  The ecoff_debug_swap

     structure provides the sizes of the structures and the functions

     needed to swap the information in and out.  These pointers are

     all pointers to arrays, not single structures.  They will be NULL

     if there are no instances of the relevant structure.  These

     fields are also used by the assembler to output ECOFF debugging

     information.  */

  unsigned char *line;

  void *external_dnr;   /* struct dnr_ext */

  void *external_pdr;   /* struct pdr_ext */

  void *external_sym;   /* struct sym_ext */

  void *external_opt;   /* struct opt_ext */

  union aux_ext *external_aux;

  char *ss;

  char *ssext;

  void *external_fdr;   /* struct fdr_ext */

  void *external_rfd;   /* struct rfd_ext */

  void *external_ext;   /* struct ext_ext */

  /* These fields are used when linking.  They may disappear at some

     point.  */

  char *ssext_end;

  void *external_ext_end;

  /* When linking, this field holds a mapping from the input FDR

     numbers to the output numbers, and is used when writing out the

     external symbols.  It is NULL if no mapping is required.  */

  RFDT *ifdmap;

  /* The swapped FDR information.  Currently this is never NULL, but

     code using this structure should probably double-check in case

     this changes in the future.  This is a pointer to an array, not a

     single structure.  */

  FDR *fdr;

};

/* These structures are used by the ECOFF find_nearest_line function.  */

struct ecoff_fdrtab_entry

{

  /* Base address in .text of this FDR.  */

  bfd_vma base_addr;

  FDR *fdr;

};

struct ecoff_find_line

{

  /* Allocated memory to hold function and file names.  */

  char *find_buffer;

  /* FDR table, sorted by address: */

  long fdrtab_len;

  struct ecoff_fdrtab_entry *fdrtab;

  /* Cache entry for most recently found line information.  The sect

     field is NULL if this cache does not contain valid information.  */

  struct

    {

      asection *sect;

      bfd_vma start;

      bfd_vma stop;

      const char *filename;

      const char *functionname;

      unsigned int line_num;

    } cache;

};

/********************** SWAPPING **********************/

/* The generic ECOFF code needs to be able to swap debugging

   information in and out in the specific format used by a particular

   ECOFF implementation.  This structure provides the information

   needed to do this.  */

struct ecoff_debug_swap

{

  /* Symbol table magic number.  */

  int sym_magic;

  /* Alignment of debugging information.  E.g., 4.  */

  bfd_size_type debug_align;

  /* Sizes of external symbolic information.  */

  bfd_size_type external_hdr_size;

  bfd_size_type external_dnr_size;

  bfd_size_type external_pdr_size;

  bfd_size_type external_sym_size;

  bfd_size_type external_opt_size;

  bfd_size_type external_fdr_size;

  bfd_size_type external_rfd_size;

  bfd_size_type external_ext_size;

  /* Functions to swap in external symbolic data.  */

  void (*swap_hdr_in) (bfd *, void *, HDRR *);

  void (*swap_dnr_in) (bfd *, void *, DNR *);

  void (*swap_pdr_in) (bfd *, void *, PDR *);

  void (*swap_sym_in) (bfd *, void *, SYMR *);

  void (*swap_opt_in) (bfd *, void *, OPTR *);

  void (*swap_fdr_in) (bfd *, void *, FDR *);

  void (*swap_rfd_in) (bfd *, void *, RFDT *);

  void (*swap_ext_in) (bfd *, void *, EXTR *);

  void (*swap_tir_in) (int, const struct tir_ext *, TIR *);

  void (*swap_rndx_in) (int, const struct rndx_ext *, RNDXR *);

  /* Functions to swap out external symbolic data.  */

  void (*swap_hdr_out) (bfd *, const HDRR *, void *);

  void (*swap_dnr_out) (bfd *, const DNR *, void *);

  void (*swap_pdr_out) (bfd *, const PDR *, void *);

  void (*swap_sym_out) (bfd *, const SYMR *, void *);

  void (*swap_opt_out) (bfd *, const OPTR *, void *);

  void (*swap_fdr_out) (bfd *, const FDR *, void *);

  void (*swap_rfd_out) (bfd *, const RFDT *, void *);

  void (*swap_ext_out) (bfd *, const EXTR *, void *);

  void (*swap_tir_out) (int, const TIR *, struct tir_ext *);

  void (*swap_rndx_out) (int, const RNDXR *, struct rndx_ext *);

  /* Function to read symbol data and set up pointers in

     ecoff_debug_info structure.  The section argument is used for

     ELF, not straight ECOFF.  */

  bfd_boolean (*read_debug_info) (bfd *, asection *, struct ecoff_debug_info *);

};

#endif /* ! defined (ECOFF_H) */