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  1. /* MMIX support for BFD.
  2.    Copyright (C) 2001-2015 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 */
  174.