| 1 | /* b.out object file format |
| 2 | Copyright (C) 1989, 90, 91, 92, 93, 94, 95, 1996 |
| 3 | Free Software Foundation, Inc. |
| 4 | |
| 5 | This file is part of GAS, the GNU Assembler. |
| 6 | |
| 7 | GAS is free software; you can redistribute it and/or modify |
| 8 | it under the terms of the GNU General Public License as |
| 9 | published by the Free Software Foundation; either version 2, |
| 10 | or (at your option) any later version. |
| 11 | |
| 12 | GAS is distributed in the hope that it will be useful, but |
| 13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 15 | the GNU General Public License for more details. |
| 16 | |
| 17 | You should have received a copy of the GNU General Public |
| 18 | License along with GAS; see the file COPYING. If not, write |
| 19 | to the Free Software Foundation, 59 Temple Place - Suite 330, Cambridge, MA |
| 20 | 02139, USA. */ |
| 21 | |
| 22 | /* |
| 23 | * This file is a modified version of 'a.out.h'. It is to be used in all GNU |
| 24 | * tools modified to support the i80960 b.out format (or tools that operate on |
| 25 | * object files created by such tools). |
| 26 | * |
| 27 | * All i80960 development is done in a CROSS-DEVELOPMENT environment. I.e., |
| 28 | * object code is generated on, and executed under the direction of a symbolic |
| 29 | * debugger running on, a host system. We do not want to be subject to the |
| 30 | * vagaries of which host it is or whether it supports COFF or a.out format, or |
| 31 | * anything else. We DO want to: |
| 32 | * |
| 33 | * o always generate the same format object files, regardless of host. |
| 34 | * |
| 35 | * o have an 'a.out' header that we can modify for our own purposes |
| 36 | * (the 80960 is typically an embedded processor and may require |
| 37 | * enhanced linker support that the normal a.out.h header can't |
| 38 | * accommodate). |
| 39 | * |
| 40 | * As for byte-ordering, the following rules apply: |
| 41 | * |
| 42 | * o Text and data that is actually downloaded to the target is always |
| 43 | * in i80960 (little-endian) order. |
| 44 | * |
| 45 | * o All other numbers (in the header, symbols, relocation directives) |
| 46 | * are in host byte-order: object files CANNOT be lifted from a |
| 47 | * little-end host and used on a big-endian (or vice versa) without |
| 48 | * modification. |
| 49 | * ==> THIS IS NO LONGER TRUE USING BFD. WE CAN GENERATE ANY BYTE ORDER |
| 50 | * FOR THE HEADER, AND READ ANY BYTE ORDER. PREFERENCE WOULD BE TO |
| 51 | * USE LITTLE-ENDIAN BYTE ORDER THROUGHOUT, REGARDLESS OF HOST. <== |
| 52 | * |
| 53 | * o The downloader ('comm960') takes care to generate a pseudo-header |
| 54 | * with correct (i80960) byte-ordering before shipping text and data |
| 55 | * off to the NINDY monitor in the target systems. Symbols and |
| 56 | * relocation info are never sent to the target. |
| 57 | */ |
| 58 | |
| 59 | |
| 60 | #define OBJ_BOUT 1 |
| 61 | |
| 62 | #define OUTPUT_FLAVOR bfd_target_aout_flavour |
| 63 | |
| 64 | #include "targ-cpu.h" |
| 65 | |
| 66 | #define OBJ_DEFAULT_OUTPUT_FILE_NAME "b.out" |
| 67 | |
| 68 | extern const short seg_N_TYPE[]; |
| 69 | extern const segT N_TYPE_seg[]; |
| 70 | |
| 71 | #define BMAGIC 0415 |
| 72 | /* We don't accept the following (see N_BADMAG macro). |
| 73 | * They're just here so GNU code will compile. |
| 74 | */ |
| 75 | #define OMAGIC 0407 /* old impure format */ |
| 76 | #define NMAGIC 0410 /* read-only text */ |
| 77 | #define ZMAGIC 0413 /* demand load format */ |
| 78 | |
| 79 | #ifndef DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE |
| 80 | #define DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE (BMAGIC) |
| 81 | #endif /* DEFAULT_MAGIC_NUMBER_FOR_OBJECT_FILE */ |
| 82 | |
| 83 | /* FILE HEADER |
| 84 | * All 'lengths' are given as a number of bytes. |
| 85 | * All 'alignments' are for relinkable files only; an alignment of |
| 86 | * 'n' indicates the corresponding segment must begin at an |
| 87 | * address that is a multiple of (2**n). |
| 88 | */ |
| 89 | struct exec |
| 90 | { |
| 91 | /* Standard stuff */ |
| 92 | unsigned long a_magic; /* Identifies this as a b.out file */ |
| 93 | unsigned long a_text; /* Length of text */ |
| 94 | unsigned long a_data; /* Length of data */ |
| 95 | unsigned long a_bss; /* Length of runtime uninitialized data area */ |
| 96 | unsigned long a_syms; /* Length of symbol table */ |
| 97 | unsigned long a_entry; /* Runtime start address */ |
| 98 | unsigned long a_trsize; /* Length of text relocation info */ |
| 99 | unsigned long a_drsize; /* Length of data relocation info */ |
| 100 | |
| 101 | /* Added for i960 */ |
| 102 | unsigned long a_tload; /* Text runtime load address */ |
| 103 | unsigned long a_dload; /* Data runtime load address */ |
| 104 | unsigned char a_talign; /* Alignment of text segment */ |
| 105 | unsigned char a_dalign; /* Alignment of data segment */ |
| 106 | unsigned char a_balign; /* Alignment of bss segment */ |
| 107 | unsigned char a_relaxable; /* Contains enough info to relax */ |
| 108 | }; |
| 109 | |
| 110 | #define N_BADMAG(x) (((x).a_magic)!=BMAGIC) |
| 111 | #define N_TXTOFF(x) ( sizeof(struct exec) ) |
| 112 | #define N_DATOFF(x) ( N_TXTOFF(x) + (x).a_text ) |
| 113 | #define N_TROFF(x) ( N_DATOFF(x) + (x).a_data ) |
| 114 | #define N_DROFF(x) ( N_TROFF(x) + (x).a_trsize ) |
| 115 | #define N_SYMOFF(x) ( N_DROFF(x) + (x).a_drsize ) |
| 116 | #define N_STROFF(x) ( N_SYMOFF(x) + (x).a_syms ) |
| 117 | |
| 118 | /* A single entry in the symbol table |
| 119 | */ |
| 120 | struct nlist |
| 121 | { |
| 122 | union |
| 123 | { |
| 124 | char *n_name; |
| 125 | struct nlist *n_next; |
| 126 | long n_strx; /* Index into string table */ |
| 127 | } |
| 128 | n_un; |
| 129 | unsigned char n_type; /* See below */ |
| 130 | char n_other; /* Used in i80960 support -- see below */ |
| 131 | short n_desc; |
| 132 | unsigned long n_value; |
| 133 | }; |
| 134 | |
| 135 | typedef struct nlist obj_symbol_type; |
| 136 | |
| 137 | /* Legal values of n_type |
| 138 | */ |
| 139 | #define N_UNDF 0 /* Undefined symbol */ |
| 140 | #define N_ABS 2 /* Absolute symbol */ |
| 141 | #define N_TEXT 4 /* Text symbol */ |
| 142 | #define N_DATA 6 /* Data symbol */ |
| 143 | #define N_BSS 8 /* BSS symbol */ |
| 144 | #define N_FN 31 /* Filename symbol */ |
| 145 | |
| 146 | #define N_EXT 1 /* External symbol (OR'd in with one of above) */ |
| 147 | #define N_TYPE 036 /* Mask for all the type bits */ |
| 148 | #define N_STAB 0340 /* Mask for all bits used for SDB entries */ |
| 149 | |
| 150 | #ifndef CUSTOM_RELOC_FORMAT |
| 151 | struct relocation_info |
| 152 | { |
| 153 | int r_address; /* File address of item to be relocated */ |
| 154 | unsigned |
| 155 | r_index:24, /* Index of symbol on which relocation is based*/ |
| 156 | r_pcrel:1, /* 1 => relocate PC-relative; else absolute |
| 157 | * On i960, pc-relative implies 24-bit |
| 158 | * address, absolute implies 32-bit. |
| 159 | */ |
| 160 | r_length:2, /* Number of bytes to relocate: |
| 161 | * 0 => 1 byte |
| 162 | * 1 => 2 bytes |
| 163 | * 2 => 4 bytes -- only value used for i960 |
| 164 | */ |
| 165 | r_extern:1, r_bsr:1, /* Something for the GNU NS32K assembler */ |
| 166 | r_disp:1, /* Something for the GNU NS32K assembler */ |
| 167 | r_callj:1, /* 1 if relocation target is an i960 'callj' */ |
| 168 | nuthin:1; /* Unused */ |
| 169 | }; |
| 170 | |
| 171 | #endif /* CUSTOM_RELOC_FORMAT */ |
| 172 | |
| 173 | /* |
| 174 | * Macros to extract information from a symbol table entry. |
| 175 | * This syntaxic indirection allows independence regarding a.out or coff. |
| 176 | * The argument (s) of all these macros is a pointer to a symbol table entry. |
| 177 | */ |
| 178 | |
| 179 | /* Predicates */ |
| 180 | /* True if the symbol is external */ |
| 181 | #define S_IS_EXTERNAL(s) ((s)->sy_symbol.n_type & N_EXT) |
| 182 | |
| 183 | /* True if symbol has been defined, ie is in N_{TEXT,DATA,BSS,ABS} or N_EXT */ |
| 184 | #define S_IS_DEFINED(s) ((S_GET_TYPE(s) != N_UNDF) || (S_GET_DESC(s) != 0)) |
| 185 | |
| 186 | #define S_IS_COMMON(s) \ |
| 187 | (S_GET_TYPE (s) == N_UNDF && S_GET_VALUE (s) != 0) |
| 188 | |
| 189 | #define S_IS_REGISTER(s) ((s)->sy_symbol.n_type == N_REGISTER) |
| 190 | |
| 191 | /* True if a debug special symbol entry */ |
| 192 | #define S_IS_DEBUG(s) ((s)->sy_symbol.n_type & N_STAB) |
| 193 | /* True if a symbol is local symbol name */ |
| 194 | #define S_IS_LOCAL(s) \ |
| 195 | ((S_GET_NAME (s) \ |
| 196 | && !S_IS_DEBUG (s) \ |
| 197 | && (strchr (S_GET_NAME (s), '\001') != NULL \ |
| 198 | || strchr (S_GET_NAME (s), '\002') != NULL \ |
| 199 | || (S_LOCAL_NAME(s) && !flag_keep_locals))) \ |
| 200 | || (flag_strip_local_absolute \ |
| 201 | && !S_IS_EXTERNAL(s) \ |
| 202 | && S_GET_SEGMENT(s) == absolute_section)) |
| 203 | /* True if a symbol is not defined in this file */ |
| 204 | #define S_IS_EXTERN(s) ((s)->sy_symbol.n_type & N_EXT) |
| 205 | /* True if the symbol has been generated because of a .stabd directive */ |
| 206 | #define S_IS_STABD(s) (S_GET_NAME(s) == NULL) |
| 207 | |
| 208 | /* Accessors */ |
| 209 | /* The name of the symbol */ |
| 210 | #define S_GET_NAME(s) ((s)->sy_symbol.n_un.n_name) |
| 211 | /* The pointer to the string table */ |
| 212 | #define S_GET_OFFSET(s) ((s)->sy_symbol.n_un.n_strx) |
| 213 | /* The type of the symbol */ |
| 214 | #define S_GET_TYPE(s) ((s)->sy_symbol.n_type & N_TYPE) |
| 215 | /* The numeric value of the segment */ |
| 216 | #define S_GET_SEGMENT(s) (N_TYPE_seg[S_GET_TYPE(s)]) |
| 217 | /* The n_other expression value */ |
| 218 | #define S_GET_OTHER(s) ((s)->sy_symbol.n_other) |
| 219 | /* The n_desc expression value */ |
| 220 | #define S_GET_DESC(s) ((s)->sy_symbol.n_desc) |
| 221 | |
| 222 | /* Modifiers */ |
| 223 | /* Assume that a symbol cannot be simultaneously in more than on segment */ |
| 224 | /* set segment */ |
| 225 | #define S_SET_SEGMENT(s,seg) ((s)->sy_symbol.n_type &= ~N_TYPE,(s)->sy_symbol.n_type|=SEGMENT_TO_SYMBOL_TYPE(seg)) |
| 226 | /* The symbol is external */ |
| 227 | #define S_SET_EXTERNAL(s) ((s)->sy_symbol.n_type |= N_EXT) |
| 228 | /* The symbol is not external */ |
| 229 | #define S_CLEAR_EXTERNAL(s) ((s)->sy_symbol.n_type &= ~N_EXT) |
| 230 | /* Set the name of the symbol */ |
| 231 | #define S_SET_NAME(s,v) ((s)->sy_symbol.n_un.n_name = (v)) |
| 232 | /* Set the offset in the string table */ |
| 233 | #define S_SET_OFFSET(s,v) ((s)->sy_symbol.n_un.n_strx = (v)) |
| 234 | /* Set the n_other expression value */ |
| 235 | #define S_SET_OTHER(s,v) ((s)->sy_symbol.n_other = (v)) |
| 236 | /* Set the n_desc expression value */ |
| 237 | #define S_SET_DESC(s,v) ((s)->sy_symbol.n_desc = (v)) |
| 238 | /* Set the n_type value */ |
| 239 | #define S_SET_TYPE(s,v) ((s)->sy_symbol.n_type = (v)) |
| 240 | |
| 241 | /* File header macro and type definition */ |
| 242 | |
| 243 | #define H_GET_FILE_SIZE(h) (sizeof(struct exec) + \ |
| 244 | H_GET_TEXT_SIZE(h) + H_GET_DATA_SIZE(h) + \ |
| 245 | H_GET_SYMBOL_TABLE_SIZE(h) + \ |
| 246 | H_GET_TEXT_RELOCATION_SIZE(h) + \ |
| 247 | H_GET_DATA_RELOCATION_SIZE(h) + \ |
| 248 | (h)->string_table_size) |
| 249 | |
| 250 | #define H_GET_HEADER_SIZE(h) (sizeof(struct exec)) |
| 251 | #define H_GET_TEXT_SIZE(h) ((h)->header.a_text) |
| 252 | #define H_GET_DATA_SIZE(h) ((h)->header.a_data) |
| 253 | #define H_GET_BSS_SIZE(h) ((h)->header.a_bss) |
| 254 | #define H_GET_TEXT_RELOCATION_SIZE(h) ((h)->header.a_trsize) |
| 255 | #define H_GET_DATA_RELOCATION_SIZE(h) ((h)->header.a_drsize) |
| 256 | #define H_GET_SYMBOL_TABLE_SIZE(h) ((h)->header.a_syms) |
| 257 | #define H_GET_MAGIC_NUMBER(h) ((h)->header.a_info) |
| 258 | #define H_GET_ENTRY_POINT(h) ((h)->header.a_entry) |
| 259 | #define H_GET_STRING_SIZE(h) ((h)->string_table_size) |
| 260 | #define H_GET_LINENO_SIZE(h) (0) |
| 261 | |
| 262 | #ifdef EXEC_MACHINE_TYPE |
| 263 | #define H_GET_MACHINE_TYPE(h) ((h)->header.a_machtype) |
| 264 | #endif /* EXEC_MACHINE_TYPE */ |
| 265 | #ifdef EXEC_VERSION |
| 266 | #define H_GET_VERSION(h) ((h)->header.a_version) |
| 267 | #endif /* EXEC_VERSION */ |
| 268 | |
| 269 | #define H_SET_TEXT_SIZE(h,v) ((h)->header.a_text = (v)) |
| 270 | #define H_SET_DATA_SIZE(h,v) ((h)->header.a_data = (v)) |
| 271 | #define H_SET_BSS_SIZE(h,v) ((h)->header.a_bss = (v)) |
| 272 | |
| 273 | #define H_SET_RELOCATION_SIZE(h,t,d) (H_SET_TEXT_RELOCATION_SIZE((h),(t)),\ |
| 274 | H_SET_DATA_RELOCATION_SIZE((h),(d))) |
| 275 | |
| 276 | #define H_SET_TEXT_RELOCATION_SIZE(h,v) ((h)->header.a_trsize = (v)) |
| 277 | #define H_SET_DATA_RELOCATION_SIZE(h,v) ((h)->header.a_drsize = (v)) |
| 278 | #define H_SET_SYMBOL_TABLE_SIZE(h,v) ((h)->header.a_syms = (v) * \ |
| 279 | sizeof(struct nlist)) |
| 280 | |
| 281 | #define H_SET_MAGIC_NUMBER(h,v) ((h)->header.a_magic = (v)) |
| 282 | |
| 283 | #define H_SET_ENTRY_POINT(h,v) ((h)->header.a_entry = (v)) |
| 284 | #define H_SET_STRING_SIZE(h,v) ((h)->string_table_size = (v)) |
| 285 | #ifdef EXEC_MACHINE_TYPE |
| 286 | #define H_SET_MACHINE_TYPE(h,v) ((h)->header.a_machtype = (v)) |
| 287 | #endif /* EXEC_MACHINE_TYPE */ |
| 288 | #ifdef EXEC_VERSION |
| 289 | #define H_SET_VERSION(h,v) ((h)->header.a_version = (v)) |
| 290 | #endif /* EXEC_VERSION */ |
| 291 | |
| 292 | typedef struct |
| 293 | { |
| 294 | struct exec header; /* a.out header */ |
| 295 | long string_table_size; /* names + '\0' + sizeof(int) */ |
| 296 | } |
| 297 | |
| 298 | object_headers; |
| 299 | |
| 300 | /* unused hooks. */ |
| 301 | #define OBJ_EMIT_LINENO(a, b, c) {;} |
| 302 | #define obj_pre_write_hook(a) {;} |
| 303 | |
| 304 | #if __STDC__ |
| 305 | struct fix; |
| 306 | #endif |
| 307 | extern void tc_aout_fix_to_chars PARAMS ((char *where, |
| 308 | struct fix *fixP, |
| 309 | relax_addressT segment_address)); |
| 310 | extern void tc_bout_fix_to_chars PARAMS ((char *where, |
| 311 | struct fix *fixP, |
| 312 | relax_addressT segment_address)); |
| 313 | |
| 314 | #define AOUT_STABS |
| 315 | |
| 316 | /* end of obj-bout.h */ |