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fecd2382 | 1 | /* b.out object file format |
01170860 | 2 | Copyright (C) 1989, 1990, 1991, 1992 Free Software Foundation, Inc. |
355afbcd | 3 | |
a39116f1 | 4 | This file is part of GAS, the GNU Assembler. |
355afbcd | 5 | |
a39116f1 RP |
6 | GAS is free software; you can redistribute it and/or modify |
7 | it under the terms of the GNU General Public License as | |
8 | published by the Free Software Foundation; either version 2, | |
9 | or (at your option) any later version. | |
355afbcd | 10 | |
a39116f1 RP |
11 | GAS is distributed in the hope that it will be useful, but |
12 | WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See | |
14 | the GNU General Public License for more details. | |
355afbcd | 15 | |
a39116f1 RP |
16 | You should have received a copy of the GNU General Public |
17 | License along with GAS; see the file COPYING. If not, write | |
18 | to the Free Software Foundation, 675 Mass Ave, Cambridge, MA | |
19 | 02139, USA. */ | |
fecd2382 | 20 | |
fecd2382 RP |
21 | /* |
22 | * This file is a modified version of 'a.out.h'. It is to be used in all GNU | |
23 | * tools modified to support the i80960 b.out format (or tools that operate on | |
24 | * object files created by such tools). | |
25 | * | |
26 | * All i80960 development is done in a CROSS-DEVELOPMENT environment. I.e., | |
27 | * object code is generated on, and executed under the direction of a symbolic | |
28 | * debugger running on, a host system. We do not want to be subject to the | |
29 | * vagaries of which host it is or whether it supports COFF or a.out format, or | |
30 | * anything else. We DO want to: | |
31 | * | |
32 | * o always generate the same format object files, regardless of host. | |
33 | * | |
34 | * o have an 'a.out' header that we can modify for our own purposes | |
35 | * (the 80960 is typically an embedded processor and may require | |
36 | * enhanced linker support that the normal a.out.h header can't | |
37 | * accommodate). | |
38 | * | |
39 | * As for byte-ordering, the following rules apply: | |
40 | * | |
41 | * o Text and data that is actually downloaded to the target is always | |
42 | * in i80960 (little-endian) order. | |
43 | * | |
44 | * o All other numbers (in the header, symbols, relocation directives) | |
45 | * are in host byte-order: object files CANNOT be lifted from a | |
46 | * little-end host and used on a big-endian (or vice versa) without | |
47 | * modification. | |
8ae35e59 ILT |
48 | * ==> THIS IS NO LONGER TRUE USING BFD. WE CAN GENERATE ANY BYTE ORDER |
49 | * FOR THE HEADER, AND READ ANY BYTE ORDER. PREFERENCE WOULD BE TO | |
50 | * USE LITTLE-ENDIAN BYTE ORDER THROUGHOUT, REGARDLESS OF HOST. <== | |
fecd2382 RP |
51 | * |
52 | * o The downloader ('comm960') takes care to generate a pseudo-header | |
53 | * with correct (i80960) byte-ordering before shipping text and data | |
54 | * off to the NINDY monitor in the target systems. Symbols and | |
55 | * relocation info are never sent to the target. | |
56 | */ | |
57 | ||
58 | ||
59 | #define OBJ_BOUT 1 | |
60 | ||
61 | #include "targ-cpu.h" | |
62 | ||
a39116f1 | 63 | /* We want \v. */ |
fecd2382 RP |
64 | #define BACKSLASH_V 1 |
65 | ||
66 | #define OBJ_DEFAULT_OUTPUT_FILE_NAME "b.out" | |
67 | ||
68 | extern const short seg_N_TYPE[]; | |
355afbcd | 69 | extern const segT N_TYPE_seg[]; |
fecd2382 RP |
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 | */ | |
355afbcd KR |
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 | }; | |
fecd2382 RP |
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 | */ | |
355afbcd KR |
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 | }; | |
fecd2382 RP |
134 | |
135 | typedef struct nlist obj_symbol_type; | |
136 | ||
137 | /* Legal values of n_type | |
138 | */ | |
355afbcd KR |
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 */ | |
fecd2382 | 145 | |
355afbcd KR |
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 */ | |
fecd2382 RP |
149 | |
150 | #ifndef CUSTOM_RELOC_FORMAT | |
355afbcd KR |
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 | |
a39116f1 RP |
157 | * On i960, pc-relative implies 24-bit |
158 | * address, absolute implies 32-bit. | |
159 | */ | |
355afbcd | 160 | r_length:2, /* Number of bytes to relocate: |
a39116f1 RP |
161 | * 0 => 1 byte |
162 | * 1 => 2 bytes | |
163 | * 2 => 4 bytes -- only value used for i960 | |
164 | */ | |
355afbcd KR |
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 | ||
fecd2382 RP |
171 | #endif /* CUSTOM_RELOC_FORMAT */ |
172 | ||
fecd2382 RP |
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 | #define S_IS_REGISTER(s) ((s)->sy_symbol.n_type == N_REGISTER) | |
186 | ||
187 | /* True if a debug special symbol entry */ | |
188 | #define S_IS_DEBUG(s) ((s)->sy_symbol.n_type & N_STAB) | |
189 | /* True if a symbol is local symbol name */ | |
190 | /* A symbol name whose name begin with ^A is a gas internal pseudo symbol | |
191 | nameless symbols come from .stab directives. */ | |
192 | #define S_IS_LOCAL(s) (S_GET_NAME(s) && \ | |
193 | !S_IS_DEBUG(s) && \ | |
194 | (S_GET_NAME(s)[0] == '\001' || \ | |
195 | (S_LOCAL_NAME(s) && !flagseen['L']))) | |
196 | /* True if a symbol is not defined in this file */ | |
197 | #define S_IS_EXTERN(s) ((s)->sy_symbol.n_type & N_EXT) | |
198 | /* True if the symbol has been generated because of a .stabd directive */ | |
199 | #define S_IS_STABD(s) (S_GET_NAME(s) == NULL) | |
200 | ||
201 | /* Accessors */ | |
fecd2382 RP |
202 | /* The name of the symbol */ |
203 | #define S_GET_NAME(s) ((s)->sy_symbol.n_un.n_name) | |
204 | /* The pointer to the string table */ | |
205 | #define S_GET_OFFSET(s) ((s)->sy_symbol.n_un.n_strx) | |
206 | /* The type of the symbol */ | |
207 | #define S_GET_TYPE(s) ((s)->sy_symbol.n_type & N_TYPE) | |
208 | /* The numeric value of the segment */ | |
209 | #define S_GET_SEGMENT(s) (N_TYPE_seg[S_GET_TYPE(s)]) | |
210 | /* The n_other expression value */ | |
211 | #define S_GET_OTHER(s) ((s)->sy_symbol.n_other) | |
212 | /* The n_desc expression value */ | |
213 | #define S_GET_DESC(s) ((s)->sy_symbol.n_desc) | |
214 | ||
215 | /* Modifiers */ | |
fecd2382 | 216 | /* Assume that a symbol cannot be simultaneously in more than on segment */ |
a39116f1 | 217 | /* set segment */ |
fecd2382 RP |
218 | #define S_SET_SEGMENT(s,seg) ((s)->sy_symbol.n_type &= ~N_TYPE,(s)->sy_symbol.n_type|=SEGMENT_TO_SYMBOL_TYPE(seg)) |
219 | /* The symbol is external */ | |
220 | #define S_SET_EXTERNAL(s) ((s)->sy_symbol.n_type |= N_EXT) | |
221 | /* The symbol is not external */ | |
222 | #define S_CLEAR_EXTERNAL(s) ((s)->sy_symbol.n_type &= ~N_EXT) | |
223 | /* Set the name of the symbol */ | |
224 | #define S_SET_NAME(s,v) ((s)->sy_symbol.n_un.n_name = (v)) | |
225 | /* Set the offset in the string table */ | |
226 | #define S_SET_OFFSET(s,v) ((s)->sy_symbol.n_un.n_strx = (v)) | |
227 | /* Set the n_other expression value */ | |
228 | #define S_SET_OTHER(s,v) ((s)->sy_symbol.n_other = (v)) | |
229 | /* Set the n_desc expression value */ | |
230 | #define S_SET_DESC(s,v) ((s)->sy_symbol.n_desc = (v)) | |
231 | ||
232 | /* File header macro and type definition */ | |
233 | ||
234 | #define H_GET_FILE_SIZE(h) (sizeof(struct exec) + \ | |
235 | H_GET_TEXT_SIZE(h) + H_GET_DATA_SIZE(h) + \ | |
236 | H_GET_SYMBOL_TABLE_SIZE(h) + \ | |
237 | H_GET_TEXT_RELOCATION_SIZE(h) + \ | |
238 | H_GET_DATA_RELOCATION_SIZE(h) + \ | |
239 | (h)->string_table_size) | |
240 | ||
a79c6033 | 241 | #define H_GET_HEADER_SIZE(h) (sizeof(struct exec)) |
fecd2382 RP |
242 | #define H_GET_TEXT_SIZE(h) ((h)->header.a_text) |
243 | #define H_GET_DATA_SIZE(h) ((h)->header.a_data) | |
244 | #define H_GET_BSS_SIZE(h) ((h)->header.a_bss) | |
245 | #define H_GET_TEXT_RELOCATION_SIZE(h) ((h)->header.a_trsize) | |
246 | #define H_GET_DATA_RELOCATION_SIZE(h) ((h)->header.a_drsize) | |
247 | #define H_GET_SYMBOL_TABLE_SIZE(h) ((h)->header.a_syms) | |
248 | #define H_GET_MAGIC_NUMBER(h) ((h)->header.a_info) | |
249 | #define H_GET_ENTRY_POINT(h) ((h)->header.a_entry) | |
250 | #define H_GET_STRING_SIZE(h) ((h)->string_table_size) | |
a79c6033 RP |
251 | #define H_GET_LINENO_SIZE(h) (0) |
252 | ||
fecd2382 RP |
253 | #ifdef EXEC_MACHINE_TYPE |
254 | #define H_GET_MACHINE_TYPE(h) ((h)->header.a_machtype) | |
255 | #endif /* EXEC_MACHINE_TYPE */ | |
256 | #ifdef EXEC_VERSION | |
257 | #define H_GET_VERSION(h) ((h)->header.a_version) | |
258 | #endif /* EXEC_VERSION */ | |
259 | ||
a79c6033 RP |
260 | #define H_SET_TEXT_SIZE(h,v) ((h)->header.a_text = (v)) |
261 | #define H_SET_DATA_SIZE(h,v) ((h)->header.a_data = (v)) | |
262 | #define H_SET_BSS_SIZE(h,v) ((h)->header.a_bss = (v)) | |
fecd2382 RP |
263 | |
264 | #define H_SET_RELOCATION_SIZE(h,t,d) (H_SET_TEXT_RELOCATION_SIZE((h),(t)),\ | |
265 | H_SET_DATA_RELOCATION_SIZE((h),(d))) | |
266 | ||
267 | #define H_SET_TEXT_RELOCATION_SIZE(h,v) ((h)->header.a_trsize = (v)) | |
268 | #define H_SET_DATA_RELOCATION_SIZE(h,v) ((h)->header.a_drsize = (v)) | |
269 | #define H_SET_SYMBOL_TABLE_SIZE(h,v) ((h)->header.a_syms = (v) * \ | |
270 | sizeof(struct nlist)) | |
271 | ||
272 | #define H_SET_MAGIC_NUMBER(h,v) ((h)->header.a_magic = (v)) | |
273 | ||
274 | #define H_SET_ENTRY_POINT(h,v) ((h)->header.a_entry = (v)) | |
275 | #define H_SET_STRING_SIZE(h,v) ((h)->string_table_size = (v)) | |
276 | #ifdef EXEC_MACHINE_TYPE | |
277 | #define H_SET_MACHINE_TYPE(h,v) ((h)->header.a_machtype = (v)) | |
278 | #endif /* EXEC_MACHINE_TYPE */ | |
279 | #ifdef EXEC_VERSION | |
280 | #define H_SET_VERSION(h,v) ((h)->header.a_version = (v)) | |
281 | #endif /* EXEC_VERSION */ | |
282 | ||
355afbcd KR |
283 | typedef struct |
284 | { | |
285 | struct exec header; /* a.out header */ | |
286 | long string_table_size; /* names + '\0' + sizeof(int) */ | |
287 | } | |
288 | ||
289 | object_headers; | |
fecd2382 RP |
290 | |
291 | /* unused hooks. */ | |
9439f48f RP |
292 | #define OBJ_EMIT_LINENO(a, b, c) {;} |
293 | #define obj_pre_write_hook(a) {;} | |
fecd2382 | 294 | |
a87b3269 | 295 | #if __STDC__ |
a79c6033 | 296 | struct fix; |
355afbcd | 297 | void tc_aout_fix_to_chars (char *where, struct fix *fixP, relax_addressT segment_address); |
a87b3269 | 298 | #else /* not __STDC__ */ |
355afbcd | 299 | void tc_aout_fix_to_chars (); |
a87b3269 | 300 | #endif /* not __STDC__ */ |
a79c6033 | 301 | |
fecd2382 | 302 | /* end of obj-bout.h */ |