source: trunk/libs/newlib/src/include/coff/i960.h @ 612

/* coff information for 80960.  Origins: Intel corp, natch.
   
   Copyright 2001, 2010 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 3 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.  */

/* NOTE: Tagentries (cf TAGBITS) are no longer used by the 960 */

/********************** 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                        */
};

#define OMAGIC      (0407)      /* old impure format. data immediately
                                   follows text. both sections are rw. */
#define NMAGIC      (0410)      /* split i&d, read-only text */

/*
*       Intel 80960 (I960) processor flags.
*       F_I960TYPE == mask for processor type field. 
*/

#define F_I960TYPE      (0xf000)
#define F_I960CORE      (0x1000)
#define F_I960KB        (0x2000)
#define F_I960SB        (0x2000)
#define F_I960MC        (0x3000)
#define F_I960XA        (0x4000)
#define F_I960CA        (0x5000)
#define F_I960KA        (0x6000)
#define F_I960SA        (0x6000)
#define F_I960JX        (0x7000)
#define F_I960HX        (0x8000)


/** i80960 Magic Numbers
*/

#define I960ROMAGIC     (0x160) /* read-only text segments */
#define I960RWMAGIC     (0x161) /* read-write text segments */

#define I960BADMAG(x) (((x).f_magic!=I960ROMAGIC) && ((x).f_magic!=I960RWMAGIC))

#define FILHDR  struct external_filehdr
#define FILHSZ  20

/********************** AOUT "OPTIONAL HEADER" **********************/

typedef struct
{
  unsigned long phys_addr;
  unsigned long bitarray;
} TAGBITS;

typedef struct 
{
  char  magic[2];               /* type of file                         */
  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 */
  char  tagentries[4];          /* number of tag entries to follow */
}
AOUTHDR;

/* return a pointer to the tag bits array */

#define TAGPTR(aout) ((TAGBITS *) (&(aout.tagentries)+1))

/* compute size of a header */

/*#define AOUTSZ(aout) (sizeof(AOUTHDR)+(aout.tagentries*sizeof(TAGBITS)))*/
#define AOUTSZ 32
#define AOUTHDRSZ 32


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

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                 */
  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[4];     /* flags                        */
  char          s_align[4];     /* section alignment            */
};


#define SCNHDR  struct external_scnhdr
#define SCNHSZ  44

/*
 * names of "special" sections
 */
#define _TEXT   ".text"
#define _DATA   ".data"
#define _BSS    ".bss"

/********************** 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          */
  char padding[2];      /* force alignment      */
};


#define LINENO  struct external_lineno
#define LINESZ  8

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

#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_flags[2];
  char e_type[4];
  char e_sclass[1];
  char e_numaux[1];
  char pad2[2];
};

#define N_BTMASK        (0x1f)
#define N_TMASK         (0x60)
#define N_BTSHFT        (5)
#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)) */

  /******************************************
   *  I960-specific *2nd* aux. entry formats
   ******************************************/
  struct
  {
    /* This is a very old typo that keeps getting propagated. */
#define x_stdindx x_stindx
    char x_stindx[4];   /* sys. table entry */
  } x_sc;       /* system call entry */

  struct
  {
    char x_balntry[4]; /* BAL entry point */
  } x_bal; /* BAL-callable function */

  struct
  {
    char x_timestamp[4];                /* time stamp */
    char        x_idstring[20];         /* producer identity string */

  } x_ident;                            /* Producer ident info */
};

#define SYMENT  struct external_syment
#define SYMESZ  24
#define AUXENT  union external_auxent
#define AUXESZ  24

#       define _ETEXT   "_etext"

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

struct external_reloc
{
  char r_vaddr[4];
  char r_symndx[4];
  char r_type[2];
  char pad[2];
};

/* r_type values for the i960.  */

/* The i960 uses R_RELLONG, which is defined in internal.h as 0x11.
   It is an absolute 32 bit relocation.  */

#define R_IPRMED        (0x19)  /* 24-bit ip-relative relocation */
#define R_OPTCALL       (0x1b)  /* 32-bit optimizable call (leafproc/sysproc) */
#define R_OPTCALLX      (0x1c)  /* 64-bit optimizable call (leafproc/sysproc) */

/* The following relocation types are defined use by relaxing linkers,
   which convert 32 bit calls (which require a 64 bit instruction)
   into 24 bit calls (which require a 32 bit instruction) when
   possible.  It will be possible whenever the target of the call is
   within a 24 bit range of the call instruction.

   It is always safe to ignore these relocations.  They only serve to
   mark points which the relaxing linker will have to consider.  The
   assembler must ensure that the correct code is generated even if
   the relocations are ignored.  In particular, this means that the
   R_IPR13 relocation may not appear with an external symbol.  */

#define R_IPR13         (0x1d)  /* 13 bit ip-relative branch */
#define R_ALIGN         (0x1e)  /* alignment marker.  This has no
                                   associated symbol.  Instead, the
                                   r_symndx field indicates the
                                   require alignment at this point in
                                   the file.  It must be a power of 2.  */

#define RELOC struct external_reloc
#define RELSZ 12