include/elf/mmix.h

   1 /* MMIX support for BFD.
   2    Copyright (C) 2001-2017 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 3 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., 51 Franklin Street - Fifth Floor, Boston,
  19    MA 02110-1301, USA.  */
  20
  21 /* This file holds definitions specific to the MMIX ELF ABI.  */
  22
  23 #ifndef ELF_MMIX_H
  24 #define ELF_MMIX_H
  25
  26 #include "elf/reloc-macros.h"
  27
  28 /* Relocations.  See the reloc table in bfd/elf64-mmix.c for details.  */
  29 START_RELOC_NUMBERS (elf_mmix_reloc_type)
  30   RELOC_NUMBER (R_MMIX_NONE, 0)
  31
  32   /* Standard absolute relocations.  */
  33   RELOC_NUMBER (R_MMIX_8, 1)
  34   RELOC_NUMBER (R_MMIX_16, 2)
  35   RELOC_NUMBER (R_MMIX_24, 3)
  36   RELOC_NUMBER (R_MMIX_32, 4)
  37   RELOC_NUMBER (R_MMIX_64, 5)
  38
  39   /* Standard relative relocations.  */
  40   RELOC_NUMBER (R_MMIX_PC_8, 6)
  41   RELOC_NUMBER (R_MMIX_PC_16, 7)
  42   RELOC_NUMBER (R_MMIX_PC_24, 8)
  43   RELOC_NUMBER (R_MMIX_PC_32, 9)
  44   RELOC_NUMBER (R_MMIX_PC_64, 10)
  45
  46   /* GNU extensions for C++ vtables.  */
  47   RELOC_NUMBER (R_MMIX_GNU_VTINHERIT, 11)
  48   RELOC_NUMBER (R_MMIX_GNU_VTENTRY, 12)
  49
  50   /* A GETA instruction.  */
  51   RELOC_NUMBER (R_MMIX_GETA, 13)
  52   RELOC_NUMBER (R_MMIX_GETA_1, 14)
  53   RELOC_NUMBER (R_MMIX_GETA_2, 15)
  54   RELOC_NUMBER (R_MMIX_GETA_3, 16)
  55
  56   /* A conditional branch instruction.  */
  57   RELOC_NUMBER (R_MMIX_CBRANCH, 17)
  58   RELOC_NUMBER (R_MMIX_CBRANCH_J, 18)
  59   RELOC_NUMBER (R_MMIX_CBRANCH_1, 19)
  60   RELOC_NUMBER (R_MMIX_CBRANCH_2, 20)
  61   RELOC_NUMBER (R_MMIX_CBRANCH_3, 21)
  62
  63   /* A PUSHJ instruction.  */
  64   RELOC_NUMBER (R_MMIX_PUSHJ, 22)
  65   RELOC_NUMBER (R_MMIX_PUSHJ_1, 23)
  66   RELOC_NUMBER (R_MMIX_PUSHJ_2, 24)
  67   RELOC_NUMBER (R_MMIX_PUSHJ_3, 25)
  68
  69   /* A JMP instruction.  */
  70   RELOC_NUMBER (R_MMIX_JMP, 26)
  71   RELOC_NUMBER (R_MMIX_JMP_1, 27)
  72   RELOC_NUMBER (R_MMIX_JMP_2, 28)
  73   RELOC_NUMBER (R_MMIX_JMP_3, 29)
  74
  75   /* A relative address such as in a GETA or a branch.  */
  76   RELOC_NUMBER (R_MMIX_ADDR19, 30)
  77
  78   /* A relative address such as in a JMP (only).  */
  79   RELOC_NUMBER (R_MMIX_ADDR27, 31)
  80
  81   /* A general register or a number 0..255.  */
  82   RELOC_NUMBER (R_MMIX_REG_OR_BYTE, 32)
  83
  84   /* A general register. */
  85   RELOC_NUMBER (R_MMIX_REG, 33)
  86
  87   /* A global register and an offset, the global register (allocated at
  88      link time) contents plus the offset made equivalent to the relocation
  89      expression at link time.  The relocation must point at the Y field of
  90      an instruction.  */
  91   RELOC_NUMBER (R_MMIX_BASE_PLUS_OFFSET, 34)
  92
  93   /* A LOCAL assertion.  */
  94   RELOC_NUMBER (R_MMIX_LOCAL, 35)
  95
  96   /* A PUSHJ instruction, generating a stub if it does not reach.  */
  97   RELOC_NUMBER (R_MMIX_PUSHJ_STUBBABLE, 36)
  98 END_RELOC_NUMBERS (R_MMIX_max)
  99
 100
 101 /* Section Attributes.  */
 102 /* A section containing necessary information for relaxation.  */
 103 #define SHF_MMIX_CANRELAX       0x80000000
 104
 105 /* Symbol attributes.  */
 106 /* A symbol with this section-index is a register.  */
 107 #define SHN_REGISTER    SHN_LOPROC
 108
 109 /* This section holds contents for each initialized register, at VMA
 110    regno*8.  A symbol relative to this section will be transformed to an
 111    absolute symbol with the value corresponding to the register number at
 112    final link time.  A symbol with a value outside the inclusive range
 113    32*8 .. 254*8 is an error.  It is highly recommended to only use an
 114    upper bound of 253*8 or lower as specified in the (currently
 115    unspecified) ABI.  */
 116 #define MMIX_REG_CONTENTS_SECTION_NAME ".MMIX.reg_contents"
 117
 118 /* At link time, a section by this name is created, expected to be
 119    included in MMIX_REG_CONTENTS_SECTION_NAME in the output.  */
 120 #define MMIX_LD_ALLOCATED_REG_CONTENTS_SECTION_NAME \
 121  ".MMIX.reg_contents.linker_allocated"
 122
 123 /* This is a faked section holding symbols with SHN_REGISTER.  Don't
 124    confuse it with MMIX_REG_CONTENTS_SECTION_NAME; this one has no
 125    contents, just values.  It is an error for a value in this section to
 126    be outside the range 32..255 and it must never become an actual section
 127    in an object file.  */
 128 #define MMIX_REG_SECTION_NAME "*REG*"
 129
 130 /* Appended with a number N=0..65535, this is a representation of the
 131    mmixal "BSPEC N" ... "ESPEC" directive pair; the contents go into an
 132    ELF section by name ".MMIX.spec_data.N".  */
 133 #define MMIX_OTHER_SPEC_SECTION_PREFIX ".MMIX.spec_data."
 134
 135 /* A section SECNAME is noted to start at "__.MMIX.start.SECNAME" by the
 136    presence of this symbol.  Currently only implemented for ".text"
 137    through the symbol "__.MMIX.start..text".  */
 138 #define MMIX_LOC_SECTION_START_SYMBOL_PREFIX "__.MMIX.start."
 139
 140 /* This symbol is always a function.  */
 141 #define MMIX_START_SYMBOL_NAME "Main"
 142
 143
 144 /* We smuggle in a few MMO specifics here.  We don't make a specific MMO
 145    file, since we can't reasonably support MMO without ELF; we have to
 146    include this file anyway.  */
 147
 148 #define MMO_TEXT_SECTION_NAME ".text"
 149 #define MMO_DATA_SECTION_NAME ".data"
 150
 151 /* A definition for the flags we put in spec data in files.  A copy of our
 152    own of some flags to keep immune to BFD flag changes.  See section.c of
 153    2001-07-18 for flag documentation.  */
 154 #define MMO_SEC_ALLOC      0x001
 155 #define MMO_SEC_LOAD       0x002
 156 #define MMO_SEC_RELOC      0x004
 157 #define MMO_SEC_READONLY   0x010
 158 #define MMO_SEC_CODE       0x020
 159 #define MMO_SEC_DATA       0x040
 160 #define MMO_SEC_NEVER_LOAD 0x400
 161 #define MMO_SEC_IS_COMMON 0x8000
 162 #define MMO_SEC_DEBUGGING 0x10000
 163
 164 #ifdef BFD_ARCH_SIZE
 165 extern bfd_boolean _bfd_mmix_before_linker_allocation
 166   (bfd *, struct bfd_link_info *);
 167 extern bfd_boolean _bfd_mmix_after_linker_allocation
 168   (bfd *, struct bfd_link_info *);
 169 extern bfd_boolean _bfd_mmix_check_all_relocs
 170   (bfd *, struct bfd_link_info *);
 171 #endif
 172
 173 #endif /* ELF_MMIX_H */