source: trunk/binutils/include/coff/a29k.h@ 3059

/* COFF spec for AMD 290*0 

   Copyright 2001 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
   
   Contributed by David Wood @ New York University. */
 
#ifndef AMD
# define AMD
#endif

#define L_LNNO_SIZE 2
#include "coff/external.h"

/*
** Magic numbers for Am29000 
**      (AT&T will assign the "real" magic number)  
*/

#define SIPFBOMAGIC     0572    /* Am29000 (Byte 0 is MSB) */
#define SIPRBOMAGIC     0573    /* Am29000 (Byte 0 is LSB) */

#define A29K_MAGIC_BIG          SIPFBOMAGIC     
#define A29K_MAGIC_LITTLE       SIPRBOMAGIC     
#define A29KBADMAG(x)   ( ((x).f_magic != A29K_MAGIC_BIG) && \
                          ((x).f_magic != A29K_MAGIC_LITTLE))

#define OMAGIC A29K_MAGIC_BIG
/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/

/*
** File header flags currently known to us.
**
** Am29000 will use the F_AR32WR and F_AR32W flags to indicate
** the byte ordering in the file.
*/

/*--------------------------------------------------------------*/


/* aouthdr magic numbers */
#define NMAGIC          0410    /* separate i/d executable */
#define SHMAGIC 0406            /* NYU/Ultra3 shared data executable 
                                   (writable text) */
#undef  _ETEXT
#define _ETEXT          "_etext"

/*--------------------------------------------------------------*/


/* More names of "special" sections.  */
#define _LIT    ".lit"

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/

/*
** Section types - with additional section type for global 
** registers which will be relocatable for the Am29000.
**
** In instances where it is necessary for a linker to produce an
** output file which contains text or data not based at virtual
** address 0, e.g. for a ROM, then the linker should accept
** address base information as command input and use PAD sections
** to skip over unused addresses.
*/

#define STYP_BSSREG     0x1200  /* Global register area (like STYP_INFO) */
#define STYP_ENVIR      0x2200  /* Environment (like STYP_INFO) */
#define STYP_ABS        0x4000  /* Absolute (allocated, not reloc, loaded) */

/*--------------------------------------------------------------*/

/*
** Relocation information declaration and related definitions
*/

struct external_reloc
{
  char r_vaddr[4];      /* (virtual) address of reference */
  char r_symndx[4];     /* index into symbol table */
  char r_type[2];       /* relocation type */
};

#define RELOC           struct external_reloc
#define RELSZ           10              /* sizeof (RELOC) */ 

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/

/*
** Relocation types for the Am29000 
*/

#define R_ABS           0       /* reference is absolute */
 
#define R_IREL          030     /* instruction relative (jmp/call) */
#define R_IABS          031     /* instruction absolute (jmp/call) */
#define R_ILOHALF       032     /* instruction low half  (const)  */
#define R_IHIHALF       033     /* instruction high half (consth) part 1 */
#define R_IHCONST       034     /* instruction high half (consth) part 2 */
                                /* constant offset of R_IHIHALF relocation */
#define R_BYTE          035     /* relocatable byte value */
#define R_HWORD         036     /* relocatable halfword value */
#define R_WORD          037     /* relocatable word value */

#define R_IGLBLRC       040     /* instruction global register RC */
#define R_IGLBLRA       041     /* instruction global register RA */
#define R_IGLBLRB       042     /* instruction global register RB */
 
/*
NOTE:
All the "I" forms refer to 29000 instruction formats.  The linker is 
expected to know how the numeric information is split and/or aligned
within the instruction word(s).  R_BYTE works for instructions, too.

If the parameter to a CONSTH instruction is a relocatable type, two 
relocation records are written.  The first has an r_type of R_IHIHALF 
(33 octal) and a normal r_vaddr and r_symndx.  The second relocation 
record has an r_type of R_IHCONST (34 octal), a normal r_vaddr (which 
is redundant), and an r_symndx containing the 32-bit constant offset 
to the relocation instead of the actual symbol table index.  This 
second record is always written, even if the constant offset is zero.
The constant fields of the instruction are set to zero.
*/

/*--------------------------------------------------------------*/

/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -*/

/*
** Storage class definitions - new classes for global registers.
*/

#define C_GLBLREG       19              /* global register */
#define C_EXTREG        20              /* external global register */
#define C_DEFREG        21              /* ext. def. of global register */