Add MMIX support

[deliverable/binutils-gdb.git] / include / elf / mmix.h

/* MMIX support for BFD.
   Copyright (C) 2001 Free Software Foundation, Inc.

This file is part of BFD, the Binary File Descriptor library.

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.  */

/* This file holds definitions specific to the MMIX ELF ABI. */
#ifndef ELF_MMIX_H
#define ELF_MMIX_H

#include "elf/reloc-macros.h"

/* Relocations.  */
START_RELOC_NUMBERS (elf_mmix_reloc_type)
  RELOC_NUMBER (R_MMIX_NONE, 0)

  /* Standard absolute relocations.  */
  RELOC_NUMBER (R_MMIX_8, 1)
  RELOC_NUMBER (R_MMIX_16, 2)
  RELOC_NUMBER (R_MMIX_24, 3)
  RELOC_NUMBER (R_MMIX_32, 4)
  RELOC_NUMBER (R_MMIX_64, 5)

  /* Standard relative relocations.  */
  RELOC_NUMBER (R_MMIX_PC_8, 6)
  RELOC_NUMBER (R_MMIX_PC_16, 7)
  RELOC_NUMBER (R_MMIX_PC_24, 8)
  RELOC_NUMBER (R_MMIX_PC_32, 9)
  RELOC_NUMBER (R_MMIX_PC_64, 10)

  /* GNU extensions for C++ vtables.  */
  RELOC_NUMBER (R_MMIX_GNU_VTINHERIT, 11)
  RELOC_NUMBER (R_MMIX_GNU_VTENTRY, 12)

  /* A GETA instruction.  */
  RELOC_NUMBER (R_MMIX_GETA, 13)
  RELOC_NUMBER (R_MMIX_GETA_1, 14)
  RELOC_NUMBER (R_MMIX_GETA_2, 15)
  RELOC_NUMBER (R_MMIX_GETA_3, 16)

  /* A conditional branch instruction.  */
  RELOC_NUMBER (R_MMIX_CBRANCH, 17)
  RELOC_NUMBER (R_MMIX_CBRANCH_J, 18)
  RELOC_NUMBER (R_MMIX_CBRANCH_1, 19)
  RELOC_NUMBER (R_MMIX_CBRANCH_2, 20)
  RELOC_NUMBER (R_MMIX_CBRANCH_3, 21)

  /* A PUSHJ instruction.  */
  RELOC_NUMBER (R_MMIX_PUSHJ, 22)
  RELOC_NUMBER (R_MMIX_PUSHJ_1, 23)
  RELOC_NUMBER (R_MMIX_PUSHJ_2, 24)
  RELOC_NUMBER (R_MMIX_PUSHJ_3, 25)

  /* A JMP instruction.  */
  RELOC_NUMBER (R_MMIX_JMP, 26)
  RELOC_NUMBER (R_MMIX_JMP_1, 27)
  RELOC_NUMBER (R_MMIX_JMP_2, 28)
  RELOC_NUMBER (R_MMIX_JMP_3, 29)

  /* A relative address such as in a GETA or a branch.  */
  RELOC_NUMBER (R_MMIX_ADDR19, 30)

  /* A relative address such as in a JMP (only).  */
  RELOC_NUMBER (R_MMIX_ADDR27, 31)

  /* A general register or a number 0..255.  */
  RELOC_NUMBER (R_MMIX_REG_OR_BYTE, 32)

  /* A general register. */
  RELOC_NUMBER (R_MMIX_REG, 33)

  /* A global register and an offset, equivalent of the expression.  */
  RELOC_NUMBER (R_MMIX_BASE_PLUS_OFFSET, 34)

  /* A LOCAL assertion.  */
  RELOC_NUMBER (R_MMIX_LOCAL, 35)
END_RELOC_NUMBERS (R_MMIX_max)


/* Section Attributes.  */
/* A section containing necessary information for relaxation.  */
#define SHF_MMIX_CANRELAX	0x80000000

/* Symbol attributes.  */
/* A symbol with this section-index is a register.  */
#define SHN_REGISTER	SHN_LOPROC

/* This section holds contents for each initialized register, at VMA
   regno*8.  A symbol relative to this section will be transformed to an
   absolute symbol with the value corresponding to the register number at
   final link time.  A symbol with a value outside the inclusive range
   32*8 .. 254*8 is an error.  It is highly recommended to only use an
   upper bound of 253*8 or lower as specified in the (currently
   unspecified) ABI.  */
#define MMIX_REG_CONTENTS_SECTION_NAME ".MMIX.reg_contents"

/* This is a faked section holding symbols with SHN_REGISTER.  Don't
   confuse it with MMIX_REG_CONTENTS_SECTION_NAME; this one has no
   contents, just values.  It is an error for a value in this section to
   be outside the range 32..255 and it must never become an actual section
   in an object file.  */
#define MMIX_REG_SECTION_NAME "*REG*"

/* Appended with a number N=0..65535, this is a representation of the
   mmixal "BSPEC N" ... "ESPEC" directive pair; the contents go into an
   ELF section by name ".MMIX.spec_data.N".  */
#define MMIX_OTHER_SPEC_SECTION_PREFIX ".MMIX.spec_data."

/* A section SECNAME is noted to start at "__.MMIX.start.SECNAME" by the
   presence of this symbol.  Currently only implemented for ".text"
   through the symbol "__.MMIX.start..text".  */
#define MMIX_LOC_SECTION_START_SYMBOL_PREFIX "__.MMIX.start."

/* This symbol is always a function.  */
#define MMIX_START_SYMBOL_NAME "Main"


/* We smuggle in a few MMO specifics here.  We don't make a specific MMO
   file, since we can't reasonably support MMO without ELF; we have to
   include this file anyway.  */

#define MMO_TEXT_SECTION_NAME ".text"
#define MMO_DATA_SECTION_NAME ".data"

/* A definition for the flags we put in spec data in files.  A copy of our
   own of some flags to keep immune to BFD flag changes.  See section.c of
   2001-07-18 for flag documentation.  */
#define MMO_SEC_ALLOC      0x001
#define MMO_SEC_LOAD       0x002
#define MMO_SEC_RELOC      0x004
#define MMO_SEC_READONLY   0x010
#define MMO_SEC_CODE       0x020
#define MMO_SEC_DATA       0x040
#define MMO_SEC_NEVER_LOAD 0x400
#define MMO_SEC_IS_COMMON 0x8000
#define MMO_SEC_DEBUGGING 0x10000

#endif /* ELF_MMIX_H */