1 /* MMIX support for BFD. 2 Copyright (C) 2001-2016 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
