1/* MMIX support for BFD. 2 Copyright 2001, 2002, 2003 Free Software Foundation, Inc. 3 4This file is part of BFD, the Binary File Descriptor library. 5 6This program is free software; you can redistribute it and/or modify 7it under the terms of the GNU General Public License as published by 8the Free Software Foundation; either version 2 of the License, or 9(at your option) any later version. 10 11This program is distributed in the hope that it will be useful, 12but WITHOUT ANY WARRANTY; without even the implied warranty of 13MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14GNU General Public License for more details. 15 16You should have received a copy of the GNU General Public License 17along with this program; if not, write to the Free Software 18Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA 02110-1301, 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. */ 27START_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) 96END_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 163extern bfd_boolean _bfd_mmix_before_linker_allocation 164 (bfd *, struct bfd_link_info *); 165extern bfd_boolean _bfd_mmix_after_linker_allocation 166 (bfd *, struct bfd_link_info *); 167extern bfd_boolean _bfd_mmix_check_all_relocs 168 (bfd *, struct bfd_link_info *); 169#endif 170 171#endif /* ELF_MMIX_H */ 172