include/elf/mmix.h

   1 /* MMIX support for BFD.
   2    Copyright (C) 2001 Free Software Foundation, Inc.
   3
   4 This file is part of BFD, the Binary File Descriptor library.
   5
   6 This program is free software; you can redistribute it and/or modify
   7 it under the terms of the GNU General Public License as published by
   8 the Free Software Foundation; either version 2 of the License, or
   9 (at your option) any later version.
  10
  11 This program is distributed in the hope that it will be useful,
  12 but WITHOUT ANY WARRANTY; without even the implied warranty of
  13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14 GNU General Public License for more details.
  15
  16 You should have received a copy of the GNU General Public License
  17 along with this program; if not, write to the Free Software
  18 Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  19
  20 /* This file holds definitions specific to the MMIX ELF ABI. */
  21 #ifndef ELF_MMIX_H
  22 #define ELF_MMIX_H
  23
  24 #include "elf/reloc-macros.h"
  25
  26 /* Relocations.  */
  27 START_RELOC_NUMBERS (elf_mmix_reloc_type)
  28   RELOC_NUMBER (R_MMIX_NONE, 0)
  29
  30   /* Standard absolute relocations.  */
  31   RELOC_NUMBER (R_MMIX_8, 1)
  32   RELOC_NUMBER (R_MMIX_16, 2)
  33   RELOC_NUMBER (R_MMIX_24, 3)
  34   RELOC_NUMBER (R_MMIX_32, 4)
  35   RELOC_NUMBER (R_MMIX_64, 5)
  36
  37   /* Standard relative relocations.  */
  38   RELOC_NUMBER (R_MMIX_PC_8, 6)
  39   RELOC_NUMBER (R_MMIX_PC_16, 7)
  40   RELOC_NUMBER (R_MMIX_PC_24, 8)
  41   RELOC_NUMBER (R_MMIX_PC_32, 9)
  42   RELOC_NUMBER (R_MMIX_PC_64, 10)
  43
  44   /* GNU extensions for C++ vtables.  */
  45   RELOC_NUMBER (R_MMIX_GNU_VTINHERIT, 11)
  46   RELOC_NUMBER (R_MMIX_GNU_VTENTRY, 12)
  47
  48   /* A GETA instruction.  */
  49   RELOC_NUMBER (R_MMIX_GETA, 13)
  50   RELOC_NUMBER (R_MMIX_GETA_1, 14)
  51   RELOC_NUMBER (R_MMIX_GETA_2, 15)
  52   RELOC_NUMBER (R_MMIX_GETA_3, 16)
  53
  54   /* A conditional branch instruction.  */
  55   RELOC_NUMBER (R_MMIX_CBRANCH, 17)
  56   RELOC_NUMBER (R_MMIX_CBRANCH_J, 18)
  57   RELOC_NUMBER (R_MMIX_CBRANCH_1, 19)
  58   RELOC_NUMBER (R_MMIX_CBRANCH_2, 20)
  59   RELOC_NUMBER (R_MMIX_CBRANCH_3, 21)
  60
  61   /* A PUSHJ instruction.  */
  62   RELOC_NUMBER (R_MMIX_PUSHJ, 22)
  63   RELOC_NUMBER (R_MMIX_PUSHJ_1, 23)
  64   RELOC_NUMBER (R_MMIX_PUSHJ_2, 24)
  65   RELOC_NUMBER (R_MMIX_PUSHJ_3, 25)
  66
  67   /* A JMP instruction.  */
  68   RELOC_NUMBER (R_MMIX_JMP, 26)
  69   RELOC_NUMBER (R_MMIX_JMP_1, 27)
  70   RELOC_NUMBER (R_MMIX_JMP_2, 28)
  71   RELOC_NUMBER (R_MMIX_JMP_3, 29)
  72
  73   /* A relative address such as in a GETA or a branch.  */
  74   RELOC_NUMBER (R_MMIX_ADDR19, 30)
  75
  76   /* A relative address such as in a JMP (only).  */
  77   RELOC_NUMBER (R_MMIX_ADDR27, 31)
  78
  79   /* A general register or a number 0..255.  */
  80   RELOC_NUMBER (R_MMIX_REG_OR_BYTE, 32)
  81
  82   /* A general register. */
  83   RELOC_NUMBER (R_MMIX_REG, 33)
  84
  85   /* A global register and an offset, equivalent of the expression.  */
  86   RELOC_NUMBER (R_MMIX_BASE_PLUS_OFFSET, 34)
  87
  88   /* A LOCAL assertion.  */
  89   RELOC_NUMBER (R_MMIX_LOCAL, 35)
  90 END_RELOC_NUMBERS (R_MMIX_max)
  91
  92
  93 /* Section Attributes.  */
  94 /* A section containing necessary information for relaxation.  */
  95 #define SHF_MMIX_CANRELAX       0x80000000
  96
  97 /* Symbol attributes.  */
  98 /* A symbol with this section-index is a register.  */
  99 #define SHN_REGISTER    SHN_LOPROC
 100
 101 /* This section holds contents for each initialized register, at VMA
 102    regno*8.  A symbol relative to this section will be transformed to an
 103    absolute symbol with the value corresponding to the register number at
 104    final link time.  A symbol with a value outside the inclusive range
 105    32*8 .. 254*8 is an error.  It is highly recommended to only use an
 106    upper bound of 253*8 or lower as specified in the (currently
 107    unspecified) ABI.  */
 108 #define MMIX_REG_CONTENTS_SECTION_NAME ".MMIX.reg_contents"
 109
 110 /* This is a faked section holding symbols with SHN_REGISTER.  Don't
 111    confuse it with MMIX_REG_CONTENTS_SECTION_NAME; this one has no
 112    contents, just values.  It is an error for a value in this section to
 113    be outside the range 32..255 and it must never become an actual section
 114    in an object file.  */
 115 #define MMIX_REG_SECTION_NAME "*REG*"
 116
 117 /* Appended with a number N=0..65535, this is a representation of the
 118    mmixal "BSPEC N" ... "ESPEC" directive pair; the contents go into an
 119    ELF section by name ".MMIX.spec_data.N".  */
 120 #define MMIX_OTHER_SPEC_SECTION_PREFIX ".MMIX.spec_data."
 121
 122 /* A section SECNAME is noted to start at "__.MMIX.start.SECNAME" by the
 123    presence of this symbol.  Currently only implemented for ".text"
 124    through the symbol "__.MMIX.start..text".  */
 125 #define MMIX_LOC_SECTION_START_SYMBOL_PREFIX "__.MMIX.start."
 126
 127 /* This symbol is always a function.  */
 128 #define MMIX_START_SYMBOL_NAME "Main"
 129
 130
 131 /* We smuggle in a few MMO specifics here.  We don't make a specific MMO
 132    file, since we can't reasonably support MMO without ELF; we have to
 133    include this file anyway.  */
 134
 135 #define MMO_TEXT_SECTION_NAME ".text"
 136 #define MMO_DATA_SECTION_NAME ".data"
 137
 138 /* A definition for the flags we put in spec data in files.  A copy of our
 139    own of some flags to keep immune to BFD flag changes.  See section.c of
 140    2001-07-18 for flag documentation.  */
 141 #define MMO_SEC_ALLOC      0x001
 142 #define MMO_SEC_LOAD       0x002
 143 #define MMO_SEC_RELOC      0x004
 144 #define MMO_SEC_READONLY   0x010
 145 #define MMO_SEC_CODE       0x020
 146 #define MMO_SEC_DATA       0x040
 147 #define MMO_SEC_NEVER_LOAD 0x400
 148 #define MMO_SEC_IS_COMMON 0x8000
 149 #define MMO_SEC_DEBUGGING 0x10000
 150
 151 #endif /* ELF_MMIX_H */