include/elf/mmix.h

   1 /* MMIX support for BFD.
   2    Copyright 2001, 2002, 2003 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.  See the reloc table in bfd/elf64-mmix.c for details.  */
  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, the global register (allocated at
  86      link time) contents plus the offset made equivalent to the relocation
  87      expression at link time.  The relocation must point at the Y field of
  88      an instruction.  */
  89   RELOC_NUMBER (R_MMIX_BASE_PLUS_OFFSET, 34)
  90
  91   /* A LOCAL assertion.  */
  92   RELOC_NUMBER (R_MMIX_LOCAL, 35)
  93
  94   /* A PUSHJ instruction, generating a stub if it does not reach.  */
  95   RELOC_NUMBER (R_MMIX_PUSHJ_STUBBABLE, 36)
  96 END_RELOC_NUMBERS (R_MMIX_max)
  97
  98
  99 /* Section Attributes.  */
 100 /* A section containing necessary information for relaxation.  */
 101 #define SHF_MMIX_CANRELAX       0x80000000
 102
 103 /* Symbol attributes.  */
 104 /* A symbol with this section-index is a register.  */
 105 #define SHN_REGISTER    SHN_LOPROC
 106
 107 /* This section holds contents for each initialized register, at VMA
 108    regno*8.  A symbol relative to this section will be transformed to an
 109    absolute symbol with the value corresponding to the register number at
 110    final link time.  A symbol with a value outside the inclusive range
 111    32*8 .. 254*8 is an error.  It is highly recommended to only use an
 112    upper bound of 253*8 or lower as specified in the (currently
 113    unspecified) ABI.  */
 114 #define MMIX_REG_CONTENTS_SECTION_NAME ".MMIX.reg_contents"
 115
 116 /* At link time, a section by this name is created, expected to be
 117    included in MMIX_REG_CONTENTS_SECTION_NAME in the output.  */
 118 #define MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME \
 119  ".MMIX.reg_contents.linker_allocated"
 120
 121 /* This is a faked section holding symbols with SHN_REGISTER.  Don't
 122    confuse it with MMIX_REG_CONTENTS_SECTION_NAME; this one has no
 123    contents, just values.  It is an error for a value in this section to
 124    be outside the range 32..255 and it must never become an actual section
 125    in an object file.  */
 126 #define MMIX_REG_SECTION_NAME "*REG*"
 127
 128 /* Appended with a number N=0..65535, this is a representation of the
 129    mmixal "BSPEC N" ... "ESPEC" directive pair; the contents go into an
 130    ELF section by name ".MMIX.spec_data.N".  */
 131 #define MMIX_OTHER_SPEC_SECTION_PREFIX ".MMIX.spec_data."
 132
 133 /* A section SECNAME is noted to start at "__.MMIX.start.SECNAME" by the
 134    presence of this symbol.  Currently only implemented for ".text"
 135    through the symbol "__.MMIX.start..text".  */
 136 #define MMIX_LOC_SECTION_START_SYMBOL_PREFIX "__.MMIX.start."
 137
 138 /* This symbol is always a function.  */
 139 #define MMIX_START_SYMBOL_NAME "Main"
 140
 141
 142 /* We smuggle in a few MMO specifics here.  We don't make a specific MMO
 143    file, since we can't reasonably support MMO without ELF; we have to
 144    include this file anyway.  */
 145
 146 #define MMO_TEXT_SECTION_NAME ".text"
 147 #define MMO_DATA_SECTION_NAME ".data"
 148
 149 /* A definition for the flags we put in spec data in files.  A copy of our
 150    own of some flags to keep immune to BFD flag changes.  See section.c of
 151    2001-07-18 for flag documentation.  */
 152 #define MMO_SEC_ALLOC      0x001
 153 #define MMO_SEC_LOAD       0x002
 154 #define MMO_SEC_RELOC      0x004
 155 #define MMO_SEC_READONLY   0x010
 156 #define MMO_SEC_CODE       0x020
 157 #define MMO_SEC_DATA       0x040
 158 #define MMO_SEC_NEVER_LOAD 0x400
 159 #define MMO_SEC_IS_COMMON 0x8000
 160 #define MMO_SEC_DEBUGGING 0x10000
 161
 162 #ifdef BFD_ARCH_SIZE
 163 extern bfd_boolean _bfd_mmix_before_linker_allocation
 164   (bfd *, struct bfd_link_info *);
 165 extern bfd_boolean _bfd_mmix_after_linker_allocation
 166   (bfd *, struct bfd_link_info *);
 167 extern bfd_boolean _bfd_mmix_check_all_relocs
 168   (bfd *, struct bfd_link_info *);
 169 #endif
 170
 171 #endif /* ELF_MMIX_H */