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1136f72d PR |
1 | /* $Id: ld.h,v 1.4 1993/11/01 16:26:16 pk Exp $ */ |
2 | /*- | |
3 | * This code is derived from software copyrighted by the Free Software | |
4 | * Foundation. | |
5 | * | |
6 | * Modified 1991 by Donn Seeley at UUNET Technologies, Inc. | |
7 | */ | |
8 | ||
9 | #define SUN_COMPAT | |
10 | ||
11 | #ifndef N_SIZE | |
12 | #define N_SIZE 0xc | |
13 | #endif | |
14 | ||
15 | #ifndef min | |
16 | #define min(a,b) ((a) < (b) ? (a) : (b)) | |
17 | #endif | |
18 | ||
19 | #ifndef __P | |
20 | #ifndef __STDC__ | |
21 | #define __P(a) () | |
22 | #else | |
23 | #define __P(a) a | |
24 | #endif | |
25 | #endif | |
26 | ||
27 | /* If compiled with GNU C, use the built-in alloca */ | |
28 | #if defined(__GNUC__) || defined(sparc) | |
29 | #define alloca __builtin_alloca | |
30 | #endif | |
31 | ||
32 | #include "md.h" | |
33 | #include "link.h" | |
34 | ||
35 | /* Macro to control the number of undefined references printed */ | |
36 | #define MAX_UREFS_PRINTED 10 | |
37 | ||
38 | /* Align to power-of-two boundary */ | |
39 | #define PALIGN(x,p) (((x) + (u_long)(p) - 1) & (-(u_long)(p))) | |
40 | ||
41 | /* Align to machine dependent boundary */ | |
42 | #define MALIGN(x) PALIGN(x,MAX_ALIGNMENT) | |
43 | ||
44 | /* Size of a page; obtained from the operating system. */ | |
45 | ||
46 | int page_size; | |
47 | ||
48 | /* Name this program was invoked by. */ | |
49 | ||
50 | char *progname; | |
51 | \f | |
52 | /* System dependencies */ | |
53 | ||
54 | /* Define this to specify the default executable format. */ | |
55 | ||
56 | #ifndef DEFAULT_MAGIC | |
57 | #define DEFAULT_MAGIC ZMAGIC | |
58 | #endif | |
59 | ||
60 | #ifdef QMAGIC | |
61 | int oldmagic; | |
62 | #endif | |
63 | ||
64 | ||
65 | /* | |
66 | * Ok. Following are the relocation information macros. If your | |
67 | * system should not be able to use the default set (below), you must | |
68 | * define the following: | |
69 | ||
70 | * relocation_info: This must be typedef'd (or #define'd) to the type | |
71 | * of structure that is stored in the relocation info section of your | |
72 | * a.out files. Often this is defined in the a.out.h for your system. | |
73 | * | |
74 | * RELOC_ADDRESS (rval): Offset into the current section of the | |
75 | * <whatever> to be relocated. *Must be an lvalue*. | |
76 | * | |
77 | * RELOC_EXTERN_P (rval): Is this relocation entry based on an | |
78 | * external symbol (1), or was it fully resolved upon entering the | |
79 | * loader (0) in which case some combination of the value in memory | |
80 | * (if RELOC_MEMORY_ADD_P) and the extra (if RELOC_ADD_EXTRA) contains | |
81 | * what the value of the relocation actually was. *Must be an lvalue*. | |
82 | * | |
83 | * RELOC_TYPE (rval): If this entry was fully resolved upon | |
84 | * entering the loader, what type should it be relocated as? | |
85 | * | |
86 | * RELOC_SYMBOL (rval): If this entry was not fully resolved upon | |
87 | * entering the loader, what is the index of it's symbol in the symbol | |
88 | * table? *Must be a lvalue*. | |
89 | * | |
90 | * RELOC_MEMORY_ADD_P (rval): This should return true if the final | |
91 | * relocation value output here should be added to memory, or if the | |
92 | * section of memory described should simply be set to the relocation | |
93 | * value. | |
94 | * | |
95 | * RELOC_ADD_EXTRA (rval): (Optional) This macro, if defined, gives | |
96 | * an extra value to be added to the relocation value based on the | |
97 | * individual relocation entry. *Must be an lvalue if defined*. | |
98 | * | |
99 | * RELOC_PCREL_P (rval): True if the relocation value described is | |
100 | * pc relative. | |
101 | * | |
102 | * RELOC_VALUE_RIGHTSHIFT (rval): Number of bits right to shift the | |
103 | * final relocation value before putting it where it belongs. | |
104 | * | |
105 | * RELOC_TARGET_SIZE (rval): log to the base 2 of the number of | |
106 | * bytes of size this relocation entry describes; 1 byte == 0; 2 bytes | |
107 | * == 1; 4 bytes == 2, and etc. This is somewhat redundant (we could | |
108 | * do everything in terms of the bit operators below), but having this | |
109 | * macro could end up producing better code on machines without fancy | |
110 | * bit twiddling. Also, it's easier to understand/code big/little | |
111 | * endian distinctions with this macro. | |
112 | * | |
113 | * RELOC_TARGET_BITPOS (rval): The starting bit position within the | |
114 | * object described in RELOC_TARGET_SIZE in which the relocation value | |
115 | * will go. | |
116 | * | |
117 | * RELOC_TARGET_BITSIZE (rval): How many bits are to be replaced | |
118 | * with the bits of the relocation value. It may be assumed by the | |
119 | * code that the relocation value will fit into this many bits. This | |
120 | * may be larger than RELOC_TARGET_SIZE if such be useful. | |
121 | * | |
122 | * | |
123 | * Things I haven't implemented | |
124 | * ---------------------------- | |
125 | * | |
126 | * Values for RELOC_TARGET_SIZE other than 0, 1, or 2. | |
127 | * | |
128 | * Pc relative relocation for External references. | |
129 | * | |
130 | * | |
131 | */ | |
132 | ||
133 | ||
134 | /* Default macros */ | |
135 | #ifndef RELOC_ADDRESS | |
136 | ||
137 | #define RELOC_ADDRESS(r) ((r)->r_address) | |
138 | #define RELOC_EXTERN_P(r) ((r)->r_extern) | |
139 | #define RELOC_TYPE(r) ((r)->r_symbolnum) | |
140 | #define RELOC_SYMBOL(r) ((r)->r_symbolnum) | |
141 | #define RELOC_MEMORY_SUB_P(r) 0 | |
142 | #define RELOC_MEMORY_ADD_P(r) 1 | |
143 | #undef RELOC_ADD_EXTRA | |
144 | #define RELOC_PCREL_P(r) ((r)->r_pcrel) | |
145 | #define RELOC_VALUE_RIGHTSHIFT(r) 0 | |
146 | #if defined(RTLD) && defined(SUN_COMPAT) | |
147 | #define RELOC_TARGET_SIZE(r) (2) /* !!!!! Sun BUG compatible */ | |
148 | #else | |
149 | #define RELOC_TARGET_SIZE(r) ((r)->r_length) | |
150 | #endif | |
151 | #define RELOC_TARGET_BITPOS(r) 0 | |
152 | #define RELOC_TARGET_BITSIZE(r) 32 | |
153 | ||
154 | #define RELOC_JMPTAB_P(r) ((r)->r_jmptable) | |
155 | #define RELOC_BASEREL_P(r) ((r)->r_baserel) | |
156 | #define RELOC_RELATIVE_P(r) ((r)->r_relative) | |
157 | #define RELOC_COPY_P(r) ((r)->r_copy) | |
158 | #define RELOC_LAZY_P(r) ((r)->r_jmptable) | |
159 | ||
160 | #define CHECK_GOT_RELOC(r) ((r)->r_pcrel) | |
161 | ||
162 | #endif | |
163 | ||
164 | /* | |
165 | * Internal representation of relocation types | |
166 | */ | |
167 | #define RELTYPE_EXTERN 1 | |
168 | #define RELTYPE_JMPSLOT 2 | |
169 | #define RELTYPE_BASEREL 4 | |
170 | #define RELTYPE_RELATIVE 8 | |
171 | #define RELTYPE_COPY 16 | |
172 | ||
173 | #ifdef nounderscore | |
174 | #define LPREFIX '.' | |
175 | #else | |
176 | #define LPREFIX 'L' | |
177 | #endif | |
178 | ||
179 | #ifndef TEXT_START | |
180 | #define TEXT_START(x) N_TXTADDR(x) | |
181 | #endif | |
182 | ||
183 | #ifndef DATA_START | |
184 | #define DATA_START(x) N_DATADDR(x) | |
185 | #endif | |
186 | \f | |
187 | /* If a this type of symbol is encountered, its name is a warning | |
188 | message to print each time the symbol referenced by the next symbol | |
189 | table entry is referenced. | |
190 | ||
191 | This feature may be used to allow backwards compatibility with | |
192 | certain functions (eg. gets) but to discourage programmers from | |
193 | their use. | |
194 | ||
195 | So if, for example, you wanted to have ld print a warning whenever | |
196 | the function "gets" was used in their C program, you would add the | |
197 | following to the assembler file in which gets is defined: | |
198 | ||
199 | .stabs "Obsolete function \"gets\" referenced",30,0,0,0 | |
200 | .stabs "_gets",1,0,0,0 | |
201 | ||
202 | These .stabs do not necessarily have to be in the same file as the | |
203 | gets function, they simply must exist somewhere in the compilation. */ | |
204 | ||
205 | #ifndef N_WARNING | |
206 | #define N_WARNING 0x1E /* Warning message to print if symbol | |
207 | included */ | |
208 | #endif /* This is input to ld */ | |
209 | ||
210 | /* Special global symbol types understood by GNU LD. */ | |
211 | ||
212 | /* The following type indicates the definition of a symbol as being | |
213 | an indirect reference to another symbol. The other symbol | |
214 | appears as an undefined reference, immediately following this symbol. | |
215 | ||
216 | Indirection is asymmetrical. The other symbol's value will be used | |
217 | to satisfy requests for the indirect symbol, but not vice versa. | |
218 | If the other symbol does not have a definition, libraries will | |
219 | be searched to find a definition. | |
220 | ||
221 | So, for example, the following two lines placed in an assembler | |
222 | input file would result in an object file which would direct gnu ld | |
223 | to resolve all references to symbol "foo" as references to symbol | |
224 | "bar". | |
225 | ||
226 | .stabs "_foo",11,0,0,0 | |
227 | .stabs "_bar",1,0,0,0 | |
228 | ||
229 | Note that (11 == (N_INDR | N_EXT)) and (1 == (N_UNDF | N_EXT)). */ | |
230 | ||
231 | #ifndef N_INDR | |
232 | #define N_INDR 0xa | |
233 | #endif | |
234 | ||
235 | /* The following symbols refer to set elements. These are expected | |
236 | only in input to the loader; they should not appear in loader | |
237 | output (unless relocatable output is requested). To be recognized | |
238 | by the loader, the input symbols must have their N_EXT bit set. | |
239 | All the N_SET[ATDB] symbols with the same name form one set. The | |
240 | loader collects all of these elements at load time and outputs a | |
241 | vector for each name. | |
242 | Space (an array of 32 bit words) is allocated for the set in the | |
243 | data section, and the n_value field of each set element value is | |
244 | stored into one word of the array. | |
245 | The first word of the array is the length of the set (number of | |
246 | elements). The last word of the vector is set to zero for possible | |
247 | use by incremental loaders. The array is ordered by the linkage | |
248 | order; the first symbols which the linker encounters will be first | |
249 | in the array. | |
250 | ||
251 | In C syntax this looks like: | |
252 | ||
253 | struct set_vector { | |
254 | unsigned int length; | |
255 | unsigned int vector[length]; | |
256 | unsigned int always_zero; | |
257 | }; | |
258 | ||
259 | Before being placed into the array, each element is relocated | |
260 | according to its type. This allows the loader to create an array | |
261 | of pointers to objects automatically. N_SETA type symbols will not | |
262 | be relocated. | |
263 | ||
264 | The address of the set is made into an N_SETV symbol | |
265 | whose name is the same as the name of the set. | |
266 | This symbol acts like a N_DATA global symbol | |
267 | in that it can satisfy undefined external references. | |
268 | ||
269 | For the purposes of determining whether or not to load in a library | |
270 | file, set element definitions are not considered "real | |
271 | definitions"; they will not cause the loading of a library | |
272 | member. | |
273 | ||
274 | If relocatable output is requested, none of this processing is | |
275 | done. The symbols are simply relocated and passed through to the | |
276 | output file. | |
277 | ||
278 | So, for example, the following three lines of assembler code | |
279 | (whether in one file or scattered between several different ones) | |
280 | will produce a three element vector (total length is five words; | |
281 | see above), referenced by the symbol "_xyzzy", which will have the | |
282 | addresses of the routines _init1, _init2, and _init3. | |
283 | ||
284 | *NOTE*: If symbolic addresses are used in the n_value field of the | |
285 | defining .stabs, those symbols must be defined in the same file as | |
286 | that containing the .stabs. | |
287 | ||
288 | .stabs "_xyzzy",23,0,0,_init1 | |
289 | .stabs "_xyzzy",23,0,0,_init2 | |
290 | .stabs "_xyzzy",23,0,0,_init3 | |
291 | ||
292 | Note that (23 == (N_SETT | N_EXT)). */ | |
293 | ||
294 | #ifndef N_SETA | |
295 | #define N_SETA 0x14 /* Absolute set element symbol */ | |
296 | #endif /* This is input to LD, in a .o file. */ | |
297 | ||
298 | #ifndef N_SETT | |
299 | #define N_SETT 0x16 /* Text set element symbol */ | |
300 | #endif /* This is input to LD, in a .o file. */ | |
301 | ||
302 | #ifndef N_SETD | |
303 | #define N_SETD 0x18 /* Data set element symbol */ | |
304 | #endif /* This is input to LD, in a .o file. */ | |
305 | ||
306 | #ifndef N_SETB | |
307 | #define N_SETB 0x1A /* Bss set element symbol */ | |
308 | #endif /* This is input to LD, in a .o file. */ | |
309 | ||
310 | /* Macros dealing with the set element symbols defined in a.out.h */ | |
311 | #define SET_ELEMENT_P(x) ((x) >= N_SETA && (x) <= (N_SETB|N_EXT)) | |
312 | #define TYPE_OF_SET_ELEMENT(x) ((x) - N_SETA + N_ABS) | |
313 | ||
314 | #ifndef N_SETV | |
315 | #define N_SETV 0x1C /* Pointer to set vector in data area. */ | |
316 | #endif /* This is output from LD. */ | |
317 | ||
318 | ||
319 | #ifndef __GNU_STAB__ | |
320 | ||
321 | /* Line number for the data section. This is to be used to describe | |
322 | the source location of a variable declaration. */ | |
323 | #ifndef N_DSLINE | |
324 | #define N_DSLINE (N_SLINE+N_DATA-N_TEXT) | |
325 | #endif | |
326 | ||
327 | /* Line number for the bss section. This is to be used to describe | |
328 | the source location of a variable declaration. */ | |
329 | #ifndef N_BSLINE | |
330 | #define N_BSLINE (N_SLINE+N_BSS-N_TEXT) | |
331 | #endif | |
332 | ||
333 | #endif /* not __GNU_STAB__ */ | |
334 | \f | |
335 | /* Symbol table */ | |
336 | ||
337 | /* | |
338 | * Global symbol data is recorded in these structures, one for each global | |
339 | * symbol. They are found via hashing in 'symtab', which points to a vector | |
340 | * of buckets. Each bucket is a chain of these structures through the link | |
341 | * field. | |
342 | */ | |
343 | ||
344 | typedef struct glosym { | |
345 | /* Pointer to next symbol in this symbol's hash bucket. */ | |
346 | struct glosym *link; | |
347 | /* Name of this symbol. */ | |
348 | char *name; | |
349 | /* Value of this symbol as a global symbol. */ | |
350 | long value; | |
351 | /* | |
352 | * Chain of external 'nlist's in files for this symbol, both defs and | |
353 | * refs. | |
354 | */ | |
355 | struct localsymbol *refs; | |
356 | /* | |
357 | * Any warning message that might be associated with this symbol from | |
358 | * an N_WARNING symbol encountered. | |
359 | */ | |
360 | char *warning; | |
361 | /* | |
362 | * Nonzero means definitions of this symbol as common have been seen, | |
363 | * and the value here is the largest size specified by any of them. | |
364 | */ | |
365 | int max_common_size; | |
366 | /* | |
367 | * For relocatable_output, records the index of this global sym in | |
368 | * the symbol table to be written, with the first global sym given | |
369 | * index 0. | |
370 | */ | |
371 | int symbolnum; | |
372 | /* | |
373 | * For dynamically linked output, records the index in the RRS | |
374 | * symbol table. | |
375 | */ | |
376 | int rrs_symbolnum; | |
377 | /* | |
378 | * Nonzero means a definition of this global symbol is known to | |
379 | * exist. Library members should not be loaded on its account. | |
380 | */ | |
381 | char defined; | |
382 | /* | |
383 | * Nonzero means a reference to this global symbol has been seen in a | |
384 | * file that is surely being loaded. A value higher than 1 is the | |
385 | * n_type code for the symbol's definition. | |
386 | */ | |
387 | char referenced; | |
388 | /* | |
389 | * A count of the number of undefined references printed for a | |
390 | * specific symbol. If a symbol is unresolved at the end of | |
391 | * digest_symbols (and the loading run is supposed to produce | |
392 | * relocatable output) do_file_warnings keeps track of how many | |
393 | * unresolved reference error messages have been printed for each | |
394 | * symbol here. When the number hits MAX_UREFS_PRINTED, messages | |
395 | * stop. | |
396 | */ | |
397 | unsigned char undef_refs; | |
398 | /* | |
399 | * 1 means that this symbol has multiple definitions. 2 means that | |
400 | * it has multiple definitions, and some of them are set elements, | |
401 | * one of which has been printed out already. | |
402 | */ | |
403 | unsigned char multiply_defined; | |
404 | /* Nonzero means print a message at all refs or defs of this symbol */ | |
405 | char trace; | |
406 | ||
407 | /* | |
408 | * For symbols of type N_INDR, this points at the real symbol. | |
409 | */ | |
410 | struct glosym *alias; | |
411 | ||
412 | /* | |
413 | * Count number of elements in set vector if symbol is of type N_SETV | |
414 | */ | |
415 | int setv_count; | |
416 | ||
417 | /* Dynamic lib support */ | |
418 | ||
419 | /* | |
420 | * Nonzero means a definition of this global symbol has been found | |
421 | * in a shared object. These symbols do not go into the symbol | |
422 | * section of the resulting a.out file. They *do* go into the | |
423 | * dynamic link information segment. | |
424 | */ | |
425 | char so_defined; | |
426 | ||
427 | /* Size of symbol as determined by N_SIZE 'nlist's in object files */ | |
428 | int size; | |
429 | ||
430 | /* | |
431 | * Chain of external 'nlist's in shared objects for this symbol, both | |
432 | * defs and refs. | |
433 | */ | |
434 | struct localsymbol *sorefs; | |
435 | ||
436 | /* The offset into one of the RRS tables, -1 if not used */ | |
437 | long jmpslot_offset; | |
438 | char jmpslot_claimed; | |
439 | ||
440 | long gotslot_offset; | |
441 | char gotslot_claimed; | |
442 | ||
443 | char cpyreloc_reserved; | |
444 | char cpyreloc_claimed; | |
445 | ||
446 | /* The local symbol that gave this global symbol its definition */ | |
447 | struct nlist *def_nlist; | |
448 | } symbol; | |
449 | ||
450 | /* Number of buckets in symbol hash table */ | |
451 | #define TABSIZE 1009 | |
452 | ||
453 | /* The symbol hash table: a vector of TABSIZE pointers to struct glosym. */ | |
454 | symbol *symtab[TABSIZE]; | |
455 | #define FOR_EACH_SYMBOL(i,sp) { \ | |
456 | int i; \ | |
457 | for (i = 0; i < TABSIZE; i++) { \ | |
458 | register symbol *sp; \ | |
459 | for (sp = symtab[i]; sp; sp = sp->link) | |
460 | ||
461 | #define END_EACH_SYMBOL }} | |
462 | ||
463 | /* Number of symbols in symbol hash table. */ | |
464 | int num_hash_tab_syms; | |
465 | ||
466 | /* Count the number of nlist entries that are for local symbols. | |
467 | This count and the three following counts | |
468 | are incremented as as symbols are entered in the symbol table. */ | |
469 | int local_sym_count; | |
470 | ||
471 | /* Count number of nlist entries that are for local symbols | |
472 | whose names don't start with L. */ | |
473 | int non_L_local_sym_count; | |
474 | ||
475 | /* Count the number of nlist entries for debugger info. */ | |
476 | int debugger_sym_count; | |
477 | ||
478 | /* Count the number of global symbols referenced and not defined. */ | |
479 | int undefined_global_sym_count; | |
480 | ||
481 | /* Count the number of symbols referenced from shared objects and not defined */ | |
482 | int undefined_shobj_sym_count; | |
483 | ||
484 | /* Count the number of global symbols multiply defined. */ | |
485 | int multiple_def_count; | |
486 | ||
487 | /* Count the number of defined global symbols. | |
488 | Each symbol is counted only once | |
489 | regardless of how many different nlist entries refer to it, | |
490 | since the output file will need only one nlist entry for it. | |
491 | This count is computed by `digest_symbols'; | |
492 | it is undefined while symbols are being loaded. */ | |
493 | int defined_global_sym_count; | |
494 | ||
495 | /* Count the number of symbols defined through common declarations. | |
496 | This count is kept in symdef_library, linear_library, and | |
497 | enter_global_ref. It is incremented when the defined flag is set | |
498 | in a symbol because of a common definition, and decremented when | |
499 | the symbol is defined "for real" (ie. by something besides a common | |
500 | definition). */ | |
501 | int common_defined_global_count; | |
502 | ||
503 | /* Count the number of linker defined symbols. | |
504 | XXX - Currently, only __DYNAMIC and _G_O_T_ go here if required, | |
505 | perhaps _etext, _edata and _end should go here too */ | |
506 | int special_sym_count; | |
507 | ||
508 | /* Count number of aliased symbols */ | |
509 | int global_alias_count; | |
510 | ||
511 | /* Count number of set element type symbols and the number of separate | |
512 | vectors which these symbols will fit into */ | |
513 | int set_symbol_count; | |
514 | int set_vector_count; | |
515 | ||
516 | /* Define a linked list of strings which define symbols which should | |
517 | be treated as set elements even though they aren't. Any symbol | |
518 | with a prefix matching one of these should be treated as a set | |
519 | element. | |
520 | ||
521 | This is to make up for deficiencies in many assemblers which aren't | |
522 | willing to pass any stabs through to the loader which they don't | |
523 | understand. */ | |
524 | struct string_list_element { | |
525 | char *str; | |
526 | struct string_list_element *next; | |
527 | }; | |
528 | ||
529 | struct string_list_element *set_element_prefixes; | |
530 | ||
531 | /* Count the number of warning symbols encountered. */ | |
532 | int warning_count; | |
533 | ||
534 | /* 1 => write load map. */ | |
535 | int write_map; | |
536 | ||
537 | /* 1 => write relocation into output file so can re-input it later. */ | |
538 | int relocatable_output; | |
539 | ||
540 | /* Nonzero means ptr to symbol entry for symbol to use as start addr. | |
541 | -e sets this. */ | |
542 | symbol *entry_symbol; | |
543 | ||
544 | symbol *edata_symbol; /* the symbol _edata */ | |
545 | symbol *etext_symbol; /* the symbol _etext */ | |
546 | symbol *end_symbol; /* the symbol _end */ | |
547 | symbol *got_symbol; /* the symbol __GLOBAL_OFFSET_TABLE_ */ | |
548 | symbol *dynamic_symbol; /* the symbol __DYNAMIC */ | |
549 | ||
550 | \f | |
551 | /* | |
552 | * Each input file, and each library member ("subfile") being loaded, has a | |
553 | * `file_entry' structure for it. | |
554 | * | |
555 | * For files specified by command args, these are contained in the vector which | |
556 | * `file_table' points to. | |
557 | * | |
558 | * For library members, they are dynamically allocated, and chained through the | |
559 | * `chain' field. The chain is found in the `subfiles' field of the | |
560 | * `file_entry'. The `file_entry' objects for the members have `superfile' | |
561 | * fields pointing to the one for the library. | |
562 | */ | |
563 | ||
564 | struct file_entry { | |
565 | /* Name of this file. */ | |
566 | char *filename; | |
567 | ||
568 | /* | |
569 | * Name to use for the symbol giving address of text start Usually | |
570 | * the same as filename, but for a file spec'd with -l this is the -l | |
571 | * switch itself rather than the filename. | |
572 | */ | |
573 | char *local_sym_name; | |
574 | ||
575 | /* Describe the layout of the contents of the file */ | |
576 | ||
577 | /* The file's a.out header. */ | |
578 | struct exec header; | |
579 | /* Offset in file of GDB symbol segment, or 0 if there is none. */ | |
580 | int symseg_offset; | |
581 | ||
582 | /* Describe data from the file loaded into core */ | |
583 | ||
584 | /* | |
585 | * Symbol table of the file. | |
586 | * We need access to the global symbol early, ie. before | |
587 | * symbols are asssigned there final values. gotslot_offset is | |
588 | * here because GOT entries may be generated for local symbols. | |
589 | */ | |
590 | struct localsymbol { | |
591 | struct nzlist nzlist; | |
592 | struct glosym *symbol; | |
593 | struct localsymbol *next; | |
594 | long gotslot_offset; | |
595 | char gotslot_claimed; | |
596 | } *symbols; | |
597 | ||
598 | /* Number of symbols in above array. */ | |
599 | int nsymbols; | |
600 | ||
601 | /* Size in bytes of string table. */ | |
602 | int string_size; | |
603 | ||
604 | /* | |
605 | * Pointer to the string table. The string table is not kept in core | |
606 | * all the time, but when it is in core, its address is here. | |
607 | */ | |
608 | char *strings; | |
609 | ||
610 | /* Offset of string table (normally N_STROFF() + 4) */ | |
611 | int strings_offset; | |
612 | ||
613 | /* Next two used only if `relocatable_output' or if needed for */ | |
614 | /* output of undefined reference line numbers. */ | |
615 | ||
616 | /* Text reloc info saved by `write_text' for `coptxtrel'. */ | |
617 | struct relocation_info *textrel; | |
618 | int ntextrel; | |
619 | ||
620 | /* Data reloc info saved by `write_data' for `copdatrel'. */ | |
621 | struct relocation_info *datarel; | |
622 | int ndatarel; | |
623 | ||
624 | /* Relation of this file's segments to the output file */ | |
625 | ||
626 | /* Start of this file's text seg in the output file core image. */ | |
627 | int text_start_address; | |
628 | ||
629 | /* Start of this file's data seg in the output file core image. */ | |
630 | int data_start_address; | |
631 | ||
632 | /* Start of this file's bss seg in the output file core image. */ | |
633 | int bss_start_address; | |
634 | /* | |
635 | * Offset in bytes in the output file symbol table of the first local | |
636 | * symbol for this file. Set by `write_file_symbols'. | |
637 | */ | |
638 | int local_syms_offset; | |
639 | ||
640 | /* For library members only */ | |
641 | ||
642 | /* For a library, points to chain of entries for the library members. */ | |
643 | struct file_entry *subfiles; | |
644 | ||
645 | /* | |
646 | * For a library member, offset of the member within the archive. | |
647 | * Zero for files that are not library members. | |
648 | */ | |
649 | int starting_offset; | |
650 | ||
651 | /* Size of contents of this file, if library member. */ | |
652 | int total_size; | |
653 | ||
654 | /* For library member, points to the library's own entry. */ | |
655 | struct file_entry *superfile; | |
656 | ||
657 | /* For library member, points to next entry for next member. */ | |
658 | struct file_entry *chain; | |
659 | ||
660 | /* 1 if file is a library. */ | |
661 | char library_flag; | |
662 | ||
663 | /* 1 if file's header has been read into this structure. */ | |
664 | char header_read_flag; | |
665 | ||
666 | /* 1 means search a set of directories for this file. */ | |
667 | char search_dirs_flag; | |
668 | ||
669 | /* | |
670 | * 1 means this is base file of incremental load. Do not load this | |
671 | * file's text or data. Also default text_start to after this file's | |
672 | * bss. | |
673 | */ | |
674 | char just_syms_flag; | |
675 | ||
676 | /* 1 means search for dynamic libraries (dependent on -B switch) */ | |
677 | char search_dynamic_flag; | |
678 | ||
679 | /* version numbers of selected shared library */ | |
680 | int lib_major, lib_minor; | |
681 | ||
682 | /* This entry is a shared object */ | |
683 | char is_dynamic; | |
684 | }; | |
685 | ||
686 | typedef struct localsymbol localsymbol_t; | |
687 | ||
688 | /* Vector of entries for input files specified by arguments. | |
689 | These are all the input files except for members of specified libraries. */ | |
690 | struct file_entry *file_table; | |
691 | ||
692 | /* Length of that vector. */ | |
693 | int number_of_files; | |
694 | ||
695 | /* Current link mode */ | |
696 | #define DYNAMIC 1 /* Consider shared libraries */ | |
697 | #define SYMBOLIC 2 /* Force symbolic resolution */ | |
698 | #define FORCEARCHIVE 4 /* Force inclusion of all members | |
699 | of archives */ | |
700 | #define SHAREABLE 8 /* Build a shared object */ | |
701 | int link_mode; | |
702 | ||
703 | /* | |
704 | * Runtime Relocation Section (RRS). | |
705 | * This describes the data structures that go into the output text and data | |
706 | * segments to support the run-time linker. The RRS can be empty (plain old | |
707 | * static linking), or can just exist of GOT and PLT entries (in case of | |
708 | * statically linked PIC code). | |
709 | */ | |
710 | ||
711 | int rrs_section_type; | |
712 | #define RRS_NONE 0 | |
713 | #define RRS_PARTIAL 1 | |
714 | #define RRS_FULL 2 | |
715 | ||
716 | int rrs_text_size; | |
717 | int rrs_data_size; | |
718 | int rrs_text_start; | |
719 | int rrs_data_start; | |
720 | ||
721 | /* Version number to put in __DYNAMIC (set by -V) */ | |
722 | int soversion; | |
723 | ||
724 | /* When loading the text and data, we can avoid doing a close | |
725 | and another open between members of the same library. | |
726 | ||
727 | These two variables remember the file that is currently open. | |
728 | Both are zero if no file is open. | |
729 | ||
730 | See `each_file' and `file_close'. */ | |
731 | ||
732 | struct file_entry *input_file; | |
733 | int input_desc; | |
734 | ||
735 | /* The name of the file to write; "a.out" by default. */ | |
736 | ||
737 | char *output_filename; | |
738 | ||
739 | /* Descriptor for writing that file with `mywrite'. */ | |
740 | ||
741 | int outdesc; | |
742 | ||
743 | /* Header for that file (filled in by `write_header'). */ | |
744 | ||
745 | struct exec outheader; | |
746 | ||
747 | /* The following are computed by `digest_symbols'. */ | |
748 | ||
749 | int text_size; /* total size of text of all input files. */ | |
750 | int data_size; /* total size of data of all input files. */ | |
751 | int bss_size; /* total size of bss of all input files. */ | |
752 | int text_reloc_size; /* total size of text relocation of all input files. */ | |
753 | int data_reloc_size; /* total size of data relocation of all input files. */ | |
754 | ||
755 | /* Relocation offsets set by perform_relocation(). Defined globaly here | |
756 | because some of the RRS routines need access to them */ | |
757 | int text_relocation; | |
758 | int data_relocation; | |
759 | int bss_relocation; | |
760 | int pc_relocation; | |
761 | ||
762 | /* Specifications of start and length of the area reserved at the end | |
763 | of the data segment for the set vectors. Computed in 'digest_symbols' */ | |
764 | int set_sect_start; | |
765 | int set_sect_size; | |
766 | ||
767 | /* Amount of cleared space to leave between the text and data segments. */ | |
768 | int text_pad; | |
769 | ||
770 | /* Amount of bss segment to include as part of the data segment. */ | |
771 | int data_pad; | |
772 | ||
773 | ||
774 | /* Record most of the command options. */ | |
775 | ||
776 | /* Address we assume the text section will be loaded at. | |
777 | We relocate symbols and text and data for this, but we do not | |
778 | write any padding in the output file for it. */ | |
779 | int text_start; | |
780 | ||
781 | /* Offset of default entry-pc within the text section. */ | |
782 | int entry_offset; | |
783 | ||
784 | /* Address we decide the data section will be loaded at. */ | |
785 | int data_start; | |
786 | int bss_start; | |
787 | ||
788 | /* Keep a list of any symbols referenced from the command line (so | |
789 | that error messages for these guys can be generated). This list is | |
790 | zero terminated. */ | |
791 | struct glosym **cmdline_references; | |
792 | int cl_refs_allocated; | |
793 | ||
794 | /* | |
795 | * Actual vector of directories to search; this contains those specified with | |
796 | * -L plus the standard ones. | |
797 | */ | |
798 | char **search_dirs; | |
799 | ||
800 | /* Length of the vector `search_dirs'. */ | |
801 | int n_search_dirs; | |
802 | ||
803 | void digest_symbols __P((void)); | |
804 | void load_symbols __P((void)); | |
805 | void decode_command __P((int, char **)); | |
806 | void read_header __P((int, struct file_entry *)); | |
807 | void read_entry_symbols __P((int, struct file_entry *)); | |
808 | void read_entry_strings __P((int, struct file_entry *)); | |
809 | void read_entry_relocation __P((int, struct file_entry *)); | |
810 | void write_output __P((void)); | |
811 | void write_header __P((void)); | |
812 | void write_text __P((void)); | |
813 | void write_data __P((void)); | |
814 | void write_rel __P((void)); | |
815 | void write_syms __P((void)); | |
816 | void write_symsegs __P((void)); | |
817 | void mywrite (); | |
818 | ||
819 | /* In warnings.c: */ | |
820 | void perror_name __P((char *)); | |
821 | void perror_file __P((struct file_entry *)); | |
822 | void fatal_with_file __P((char *, struct file_entry *, ...)); | |
823 | void print_symbols __P((FILE *)); | |
824 | char *get_file_name __P((struct file_entry *)); | |
825 | void print_file_name __P((struct file_entry *, FILE *)); | |
826 | void prline_file_name __P((struct file_entry *, FILE *)); | |
827 | int do_warnings __P((FILE *)); | |
828 | ||
829 | /* In etc.c: */ | |
830 | void *xmalloc __P((int)); | |
831 | void *xrealloc __P((void *, int)); | |
832 | void fatal __P((char *, ...)); | |
833 | void error __P((char *, ...)); | |
834 | void padfile __P((int,int)); | |
835 | char *concat __P((char *, char *, char *)); | |
836 | int parse __P((char *, char *, char *)); | |
837 | ||
838 | /* In symbol.c: */ | |
839 | void symtab_init __P((int)); | |
840 | symbol *getsym __P((char *)), *getsym_soft __P((char *)); | |
841 | ||
842 | /* In lib.c: */ | |
843 | void search_library __P((int, struct file_entry *)); | |
844 | void read_shared_object __P((int, struct file_entry *)); | |
845 | int findlib __P((struct file_entry *)); | |
846 | ||
847 | /* In shlib.c: */ | |
848 | char *findshlib __P((char *, int *, int *)); | |
849 | void add_search_dir __P((char *)); | |
850 | void std_search_dirs __P((char *)); | |
851 | ||
852 | /* In rrs.c: */ | |
853 | void init_rrs __P((void)); | |
854 | void rrs_add_shobj __P((struct file_entry *)); | |
855 | void alloc_rrs_reloc __P((symbol *)); | |
856 | void alloc_rrs_segment_reloc __P((struct relocation_info *)); | |
857 | void alloc_rrs_jmpslot __P((symbol *)); | |
858 | void alloc_rrs_gotslot __P((struct relocation_info *, localsymbol_t *)); | |
859 | void alloc_rrs_copy_reloc __P((symbol *)); | |
860 | ||
861 | /* In <md>.c */ | |
862 | void md_init_header __P((struct exec *, int, int)); | |
863 | long md_get_addend __P((struct relocation_info *, unsigned char *)); | |
864 | void md_relocate __P((struct relocation_info *, long, unsigned char *, int)); | |
865 | void md_make_jmpslot __P((jmpslot_t *, long, long)); | |
866 | void md_fix_jmpslot __P((jmpslot_t *, long, u_long)); | |
867 | int md_make_reloc __P((struct relocation_info *, struct relocation_info *, int)); | |
868 | void md_make_jmpreloc __P((struct relocation_info *, struct relocation_info *, int)); | |
869 | void md_make_gotreloc __P((struct relocation_info *, struct relocation_info *, int)); | |
870 | void md_make_copyreloc __P((struct relocation_info *, struct relocation_info *)); | |
871 | ||
872 | #ifdef NEED_SWAP | |
873 | void md_swapin_exec_hdr __P((struct exec *)); | |
874 | void md_swapout_exec_hdr __P((struct exec *)); | |
875 | void md_swapin_reloc __P((struct relocation_info *, int)); | |
876 | void md_swapout_reloc __P((struct relocation_info *, int)); | |
877 | void md_swapout_jmpslot __P((jmpslot_t *, int)); | |
878 | ||
879 | /* In xbits.c: */ | |
880 | void swap_longs __P((long *, int)); | |
881 | void swap_symbols __P((struct nlist *, int)); | |
882 | void swap_zsymbols __P((struct nzlist *, int)); | |
883 | void swap_ranlib_hdr __P((struct ranlib *, int)); | |
884 | void swap_link_dynamic __P((struct link_dynamic *)); | |
885 | void swap_link_dynamic_2 __P((struct link_dynamic_2 *)); | |
886 | void swap_ld_debug __P((struct ld_debug *)); | |
887 | void swapin_link_object __P((struct link_object *, int)); | |
888 | void swapout_link_object __P((struct link_object *, int)); | |
889 | void swapout_fshash __P((struct fshash *, int)); | |
890 | #endif |