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parser: support split base,index effective address
[nasm/avx512.git] / output / outelf32.c
blob48f9177692965173e23632b12478154927bf7885
1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright 1996-2010 The NASM Authors - All Rights Reserved
4 * See the file AUTHORS included with the NASM distribution for
5 * the specific copyright holders.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following
9 * conditions are met:
10 *
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
19 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
30 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 *
32 * ----------------------------------------------------------------------- */
33
34 /*
35 * outelf32.c output routines for the Netwide Assembler to produce
36 * ELF32 (i386 of course) object file format
37 */
38
39 #include "compiler.h"
40
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <ctype.h>
45 #include <inttypes.h>
46 #include <limits.h>
47
48 #include "nasm.h"
49 #include "nasmlib.h"
50 #include "saa.h"
51 #include "raa.h"
52 #include "stdscan.h"
53 #include "eval.h"
54 #include "output/outform.h"
55 #include "output/outlib.h"
56 #include "rbtree.h"
57
58 #include "output/dwarf.h"
59 #include "output/stabs.h"
60 #include "output/outelf.h"
61
62 #ifdef OF_ELF32
63
64 /*
65 * Relocation types.
66 */
67 struct Reloc {
68 struct Reloc *next;
69 int32_t address; /* relative to _start_ of section */
70 int32_t symbol; /* symbol index */
71 int type; /* type of relocation */
72 };
73
74 struct Symbol {
75 struct rbtree symv; /* symbol value and symbol rbtree */
76 int32_t strpos; /* string table position of name */
77 int32_t section; /* section ID of the symbol */
78 int type; /* symbol type */
79 int other; /* symbol visibility */
80 int32_t size; /* size of symbol */
81 int32_t globnum; /* symbol table offset if global */
82 struct Symbol *nextfwd; /* list of unresolved-size symbols */
83 char *name; /* used temporarily if in above list */
84 };
85
86 struct Section {
87 struct SAA *data;
88 uint32_t len, size, nrelocs;
89 int32_t index;
90 int type; /* SHT_PROGBITS or SHT_NOBITS */
91 uint32_t align; /* alignment: power of two */
92 uint32_t flags; /* section flags */
93 char *name;
94 struct SAA *rel;
95 int32_t rellen;
96 struct Reloc *head, **tail;
97 struct rbtree *gsyms; /* global symbols in section */
98 };
99
100 #define SECT_DELTA 32
101 static struct Section **sects;
102 static int nsects, sectlen;
103
104 #define SHSTR_DELTA 256
105 static char *shstrtab;
106 static int shstrtablen, shstrtabsize;
107
108 static struct SAA *syms;
109 static uint32_t nlocals, nglobs, ndebugs; /* Symbol counts */
110
111 static int32_t def_seg;
112
113 static struct RAA *bsym;
114
115 static struct SAA *strs;
116 static uint32_t strslen;
117
118 static struct Symbol *fwds;
119
120 static char elf_module[FILENAME_MAX];
121
122 static uint8_t elf_osabi = 0; /* Default OSABI = 0 (System V or Linux) */
123 static uint8_t elf_abiver = 0; /* Current ABI version */
124
125 extern struct ofmt of_elf32;
126
127 static struct ELF_SECTDATA {
128 void *data;
129 int32_t len;
130 bool is_saa;
131 } *elf_sects;
132 static int elf_nsect, nsections;
133 static int32_t elf_foffs;
134
135 static void elf_write(void);
136 static void elf_sect_write(struct Section *, const uint8_t *,
137 uint32_t);
138 static void elf_section_header(int, int, int, void *, bool, int32_t, int, int,
139 int, int);
140 static void elf_write_sections(void);
141 static struct SAA *elf_build_symtab(int32_t *, int32_t *);
142 static struct SAA *elf_build_reltab(int32_t *, struct Reloc *);
143 static void add_sectname(char *, char *);
144
145 struct erel {
146 int offset, info;
147 };
148
149 struct symlininfo {
150 int offset;
151 int section; /* section index */
152 char *name; /* shallow-copied pointer of section name */
153 };
154
155 struct linelist {
156 struct linelist *next;
157 struct linelist *last;
158 struct symlininfo info;
159 char *filename;
160 int line;
161 };
162
163 struct sectlist {
164 struct SAA *psaa;
165 int section;
166 int line;
167 int offset;
168 int file;
169 struct sectlist *next;
170 struct sectlist *last;
171 };
172
173 /* common debug variables */
174 static int currentline = 1;
175 static int debug_immcall = 0;
176
177 /* stabs debug variables */
178 static struct linelist *stabslines = 0;
179 static int numlinestabs = 0;
180 static char *stabs_filename = 0;
181 static uint8_t *stabbuf = 0, *stabstrbuf = 0, *stabrelbuf = 0;
182 static int stablen, stabstrlen, stabrellen;
183
184 /* dwarf debug variables */
185 static struct linelist *dwarf_flist = 0, *dwarf_clist = 0, *dwarf_elist = 0;
186 static struct sectlist *dwarf_fsect = 0, *dwarf_csect = 0, *dwarf_esect = 0;
187 static int dwarf_numfiles = 0, dwarf_nsections;
188 static uint8_t *arangesbuf = 0, *arangesrelbuf = 0, *pubnamesbuf = 0, *infobuf = 0, *inforelbuf = 0,
189 *abbrevbuf = 0, *linebuf = 0, *linerelbuf = 0, *framebuf = 0, *locbuf = 0;
190 static int8_t line_base = -5, line_range = 14, opcode_base = 13;
191 static int arangeslen, arangesrellen, pubnameslen, infolen, inforellen,
192 abbrevlen, linelen, linerellen, framelen, loclen;
193 static int32_t dwarf_infosym, dwarf_abbrevsym, dwarf_linesym;
194
195 static struct dfmt df_dwarf;
196 static struct dfmt df_stabs;
197 static struct Symbol *lastsym;
198
199 /* common debugging routines */
200 static void debug32_typevalue(int32_t);
201 static void debug32_deflabel(char *, int32_t, int64_t, int, char *);
202 static void debug32_directive(const char *, const char *);
203
204 /* stabs debugging routines */
205 static void stabs32_linenum(const char *filename, int32_t linenumber, int32_t);
206 static void stabs32_output(int, void *);
207 static void stabs32_generate(void);
208 static void stabs32_cleanup(void);
209
210 /* dwarf debugging routines */
211 static void dwarf32_init(void);
212 static void dwarf32_linenum(const char *filename, int32_t linenumber, int32_t);
213 static void dwarf32_output(int, void *);
214 static void dwarf32_generate(void);
215 static void dwarf32_cleanup(void);
216 static void dwarf32_findfile(const char *);
217 static void dwarf32_findsect(const int);
218
219 /*
220 * Special NASM section numbers which are used to define ELF special
221 * symbols, which can be used with WRT to provide PIC and TLS
222 * relocation types.
223 */
224 static int32_t elf_gotpc_sect, elf_gotoff_sect;
225 static int32_t elf_got_sect, elf_plt_sect;
226 static int32_t elf_sym_sect, elf_tlsie_sect;
227
228 static void elf_init(void)
229 {
230 sects = NULL;
231 nsects = sectlen = 0;
232 syms = saa_init((int32_t)sizeof(struct Symbol));
233 nlocals = nglobs = ndebugs = 0;
234 bsym = raa_init();
235 strs = saa_init(1L);
236 saa_wbytes(strs, "\0", 1L);
237 saa_wbytes(strs, elf_module, strlen(elf_module)+1);
238 strslen = 2 + strlen(elf_module);
239 shstrtab = NULL;
240 shstrtablen = shstrtabsize = 0;;
241 add_sectname("", "");
242
243 fwds = NULL;
244
245 elf_gotpc_sect = seg_alloc();
246 define_label("..gotpc", elf_gotpc_sect + 1, 0L, NULL, false, false);
247 elf_gotoff_sect = seg_alloc();
248 define_label("..gotoff", elf_gotoff_sect + 1, 0L, NULL, false, false);
249 elf_got_sect = seg_alloc();
250 define_label("..got", elf_got_sect + 1, 0L, NULL, false, false);
251 elf_plt_sect = seg_alloc();
252 define_label("..plt", elf_plt_sect + 1, 0L, NULL, false, false);
253 elf_sym_sect = seg_alloc();
254 define_label("..sym", elf_sym_sect + 1, 0L, NULL, false, false);
255 elf_tlsie_sect = seg_alloc();
256 define_label("..tlsie", elf_tlsie_sect + 1, 0L, NULL, false, false);
257
258 def_seg = seg_alloc();
259 }
260
261 static void elf_cleanup(int debuginfo)
262 {
263 struct Reloc *r;
264 int i;
265
266 (void)debuginfo;
267
268 elf_write();
269 for (i = 0; i < nsects; i++) {
270 if (sects[i]->type != SHT_NOBITS)
271 saa_free(sects[i]->data);
272 if (sects[i]->head)
273 saa_free(sects[i]->rel);
274 while (sects[i]->head) {
275 r = sects[i]->head;
276 sects[i]->head = sects[i]->head->next;
277 nasm_free(r);
278 }
279 }
280 nasm_free(sects);
281 saa_free(syms);
282 raa_free(bsym);
283 saa_free(strs);
284 if (of_elf32.current_dfmt) {
285 of_elf32.current_dfmt->cleanup();
286 }
287 }
288
289 static void add_sectname(char *firsthalf, char *secondhalf)
290 {
291 int len = strlen(firsthalf) + strlen(secondhalf);
292 while (shstrtablen + len + 1 > shstrtabsize)
293 shstrtab = nasm_realloc(shstrtab, (shstrtabsize += SHSTR_DELTA));
294 strcpy(shstrtab + shstrtablen, firsthalf);
295 strcat(shstrtab + shstrtablen, secondhalf);
296 shstrtablen += len + 1;
297 }
298
299 static int elf_make_section(char *name, int type, int flags, int align)
300 {
301 struct Section *s;
302
303 s = nasm_zalloc(sizeof(*s));
304
305 if (type != SHT_NOBITS)
306 s->data = saa_init(1L);
307 s->tail = &s->head;
308 if (!strcmp(name, ".text"))
309 s->index = def_seg;
310 else
311 s->index = seg_alloc();
312 add_sectname("", name);
313
314 s->name = nasm_strdup(name);
315 s->type = type;
316 s->flags = flags;
317 s->align = align;
318
319 if (nsects >= sectlen)
320 sects = nasm_realloc(sects, (sectlen += SECT_DELTA) * sizeof(*sects));
321 sects[nsects++] = s;
322
323 return nsects - 1;
324 }
325
326 static int32_t elf_section_names(char *name, int pass, int *bits)
327 {
328 char *p;
329 uint32_t flags, flags_and, flags_or;
330 uint64_t align;
331 int type, i;
332
333 /*
334 * Default is 32 bits.
335 */
336 if (!name) {
337 *bits = 32;
338 return def_seg;
339 }
340
341 p = nasm_skip_word(name);
342 if (*p)
343 *p++ = '\0';
344 flags_and = flags_or = type = align = 0;
345
346 section_attrib(name, p, pass, &flags_and,
347 &flags_or, &align, &type);
348
349 if (!strcmp(name, ".shstrtab") ||
350 !strcmp(name, ".symtab") ||
351 !strcmp(name, ".strtab")) {
352 nasm_error(ERR_NONFATAL, "attempt to redefine reserved section"
353 "name `%s'", name);
354 return NO_SEG;
355 }
356
357 for (i = 0; i < nsects; i++)
358 if (!strcmp(name, sects[i]->name))
359 break;
360 if (i == nsects) {
361 const struct elf_known_section *ks = elf_known_sections;
362
363 while (ks->name) {
364 if (!strcmp(name, ks->name))
365 break;
366 ks++;
367 }
368
369 type = type ? type : ks->type;
370 align = align ? align : ks->align;
371 flags = (ks->flags & ~flags_and) | flags_or;
372
373 i = elf_make_section(name, type, flags, align);
374 } else if (pass == 1) {
375 if ((type && sects[i]->type != type)
376 || (align && sects[i]->align != align)
377 || (flags_and && ((sects[i]->flags & flags_and) != flags_or)))
378 nasm_error(ERR_WARNING, "incompatible section attributes ignored on"
379 " redeclaration of section `%s'", name);
380 }
381
382 return sects[i]->index;
383 }
384
385 static void elf_deflabel(char *name, int32_t segment, int64_t offset,
386 int is_global, char *special)
387 {
388 int pos = strslen;
389 struct Symbol *sym;
390 bool special_used = false;
391
392 #if defined(DEBUG) && DEBUG>2
393 nasm_error(ERR_DEBUG,
394 " elf_deflabel: %s, seg=%"PRIx32", off=%"PRIx64", is_global=%d, %s\n",
395 name, segment, offset, is_global, special);
396 #endif
397 if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
398 /*
399 * This is a NASM special symbol. We never allow it into
400 * the ELF symbol table, even if it's a valid one. If it
401 * _isn't_ a valid one, we should barf immediately.
402 */
403 if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") &&
404 strcmp(name, "..got") && strcmp(name, "..plt") &&
405 strcmp(name, "..sym") && strcmp(name, "..tlsie"))
406 nasm_error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
407 return;
408 }
409
410 if (is_global == 3) {
411 struct Symbol **s;
412 /*
413 * Fix up a forward-reference symbol size from the first
414 * pass.
415 */
416 for (s = &fwds; *s; s = &(*s)->nextfwd)
417 if (!strcmp((*s)->name, name)) {
418 struct tokenval tokval;
419 expr *e;
420 char *p = nasm_skip_spaces(nasm_skip_word(special));
421
422 stdscan_reset();
423 stdscan_set(p);
424 tokval.t_type = TOKEN_INVALID;
425 e = evaluate(stdscan, NULL, &tokval, NULL, 1, nasm_error, NULL);
426 if (e) {
427 if (!is_simple(e))
428 nasm_error(ERR_NONFATAL, "cannot use relocatable"
429 " expression as symbol size");
430 else
431 (*s)->size = reloc_value(e);
432 }
433
434 /*
435 * Remove it from the list of unresolved sizes.
436 */
437 nasm_free((*s)->name);
438 *s = (*s)->nextfwd;
439 return;
440 }
441 return; /* it wasn't an important one */
442 }
443
444 saa_wbytes(strs, name, (int32_t)(1 + strlen(name)));
445 strslen += 1 + strlen(name);
446
447 lastsym = sym = saa_wstruct(syms);
448
449 memset(&sym->symv, 0, sizeof(struct rbtree));
450
451 sym->strpos = pos;
452 sym->type = is_global ? SYM_GLOBAL : SYM_LOCAL;
453 sym->other = STV_DEFAULT;
454 sym->size = 0;
455 if (segment == NO_SEG)
456 sym->section = SHN_ABS;
457 else {
458 int i;
459 sym->section = SHN_UNDEF;
460 if (segment == def_seg) {
461 /* we have to be sure at least text section is there */
462 int tempint;
463 if (segment != elf_section_names(".text", 2, &tempint))
464 nasm_error(ERR_PANIC, "strange segment conditions in ELF driver");
465 }
466 for (i = 0; i < nsects; i++) {
467 if (segment == sects[i]->index) {
468 sym->section = i + 1;
469 break;
470 }
471 }
472 }
473
474 if (is_global == 2) {
475 sym->size = offset;
476 sym->symv.key = 0;
477 sym->section = SHN_COMMON;
478 /*
479 * We have a common variable. Check the special text to see
480 * if it's a valid number and power of two; if so, store it
481 * as the alignment for the common variable.
482 */
483 if (special) {
484 bool err;
485 sym->symv.key = readnum(special, &err);
486 if (err)
487 nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a"
488 " valid number", special);
489 else if ((sym->symv.key | (sym->symv.key - 1)) != 2 * sym->symv.key - 1)
490 nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a"
491 " power of two", special);
492 }
493 special_used = true;
494 } else
495 sym->symv.key = (sym->section == SHN_UNDEF ? 0 : offset);
496
497 if (sym->type == SYM_GLOBAL) {
498 /*
499 * If sym->section == SHN_ABS, then the first line of the
500 * else section would cause a core dump, because its a reference
501 * beyond the end of the section array.
502 * This behaviour is exhibited by this code:
503 * GLOBAL crash_nasm
504 * crash_nasm equ 0
505 * To avoid such a crash, such requests are silently discarded.
506 * This may not be the best solution.
507 */
508 if (sym->section == SHN_UNDEF || sym->section == SHN_COMMON) {
509 bsym = raa_write(bsym, segment, nglobs);
510 } else if (sym->section != SHN_ABS) {
511 /*
512 * This is a global symbol; so we must add it to the rbtree
513 * of global symbols in its section.
514 *
515 * In addition, we check the special text for symbol
516 * type and size information.
517 */
518 sects[sym->section-1]->gsyms =
519 rb_insert(sects[sym->section-1]->gsyms, &sym->symv);
520
521 if (special) {
522 int n = strcspn(special, " \t");
523
524 if (!nasm_strnicmp(special, "function", n))
525 sym->type |= STT_FUNC;
526 else if (!nasm_strnicmp(special, "data", n) ||
527 !nasm_strnicmp(special, "object", n))
528 sym->type |= STT_OBJECT;
529 else if (!nasm_strnicmp(special, "notype", n))
530 sym->type |= STT_NOTYPE;
531 else
532 nasm_error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
533 n, special);
534 special += n;
535
536 special = nasm_skip_spaces(special);
537 if (*special) {
538 n = strcspn(special, " \t");
539 if (!nasm_strnicmp(special, "default", n))
540 sym->other = STV_DEFAULT;
541 else if (!nasm_strnicmp(special, "internal", n))
542 sym->other = STV_INTERNAL;
543 else if (!nasm_strnicmp(special, "hidden", n))
544 sym->other = STV_HIDDEN;
545 else if (!nasm_strnicmp(special, "protected", n))
546 sym->other = STV_PROTECTED;
547 else
548 n = 0;
549 special += n;
550 }
551
552 if (*special) {
553 struct tokenval tokval;
554 expr *e;
555 int fwd = 0;
556 char *saveme = stdscan_get();
557
558 while (special[n] && nasm_isspace(special[n]))
559 n++;
560 /*
561 * We have a size expression; attempt to
562 * evaluate it.
563 */
564 stdscan_reset();
565 stdscan_set(special + n);
566 tokval.t_type = TOKEN_INVALID;
567 e = evaluate(stdscan, NULL, &tokval, &fwd, 0, nasm_error,
568 NULL);
569 if (fwd) {
570 sym->nextfwd = fwds;
571 fwds = sym;
572 sym->name = nasm_strdup(name);
573 } else if (e) {
574 if (!is_simple(e))
575 nasm_error(ERR_NONFATAL, "cannot use relocatable"
576 " expression as symbol size");
577 else
578 sym->size = reloc_value(e);
579 }
580 stdscan_set(saveme);
581 }
582 special_used = true;
583 }
584 /*
585 * If TLS segment, mark symbol accordingly.
586 */
587 if (sects[sym->section - 1]->flags & SHF_TLS) {
588 sym->type &= 0xf0;
589 sym->type |= STT_TLS;
590 }
591 }
592 sym->globnum = nglobs;
593 nglobs++;
594 } else
595 nlocals++;
596
597 if (special && !special_used)
598 nasm_error(ERR_NONFATAL, "no special symbol features supported here");
599 }
600
601 static void elf_add_reloc(struct Section *sect, int32_t segment, int type)
602 {
603 struct Reloc *r;
604
605 r = *sect->tail = nasm_zalloc(sizeof(struct Reloc));
606 sect->tail = &r->next;
607
608 r->address = sect->len;
609 if (segment != NO_SEG) {
610 int i;
611 for (i = 0; i < nsects; i++)
612 if (segment == sects[i]->index)
613 r->symbol = i + 2;
614 if (!r->symbol)
615 r->symbol = GLOBAL_TEMP_BASE + raa_read(bsym, segment);
616 }
617 r->type = type;
618
619 sect->nrelocs++;
620 }
621
622 /*
623 * This routine deals with ..got and ..sym relocations: the more
624 * complicated kinds. In shared-library writing, some relocations
625 * with respect to global symbols must refer to the precise symbol
626 * rather than referring to an offset from the base of the section
627 * _containing_ the symbol. Such relocations call to this routine,
628 * which searches the symbol list for the symbol in question.
629 *
630 * R_386_GOT32 references require the _exact_ symbol address to be
631 * used; R_386_32 references can be at an offset from the symbol.
632 * The boolean argument `exact' tells us this.
633 *
634 * Return value is the adjusted value of `addr', having become an
635 * offset from the symbol rather than the section. Should always be
636 * zero when returning from an exact call.
637 *
638 * Limitation: if you define two symbols at the same place,
639 * confusion will occur.
640 *
641 * Inefficiency: we search, currently, using a linked list which
642 * isn't even necessarily sorted.
643 */
644 static int32_t elf_add_gsym_reloc(struct Section *sect,
645 int32_t segment, uint32_t offset,
646 int type, bool exact)
647 {
648 struct Reloc *r;
649 struct Section *s;
650 struct Symbol *sym;
651 struct rbtree *srb;
652 int i;
653
654 /*
655 * First look up the segment/offset pair and find a global
656 * symbol corresponding to it. If it's not one of our segments,
657 * then it must be an external symbol, in which case we're fine
658 * doing a normal elf_add_reloc after first sanity-checking
659 * that the offset from the symbol is zero.
660 */
661 s = NULL;
662 for (i = 0; i < nsects; i++)
663 if (segment == sects[i]->index) {
664 s = sects[i];
665 break;
666 }
667
668 if (!s) {
669 if (exact && offset)
670 nasm_error(ERR_NONFATAL, "unable to find a suitable global symbol"
671 " for this reference");
672 else
673 elf_add_reloc(sect, segment, type);
674 return offset;
675 }
676
677 srb = rb_search(s->gsyms, offset);
678 if (!srb || (exact && srb->key != offset)) {
679 nasm_error(ERR_NONFATAL, "unable to find a suitable global symbol"
680 " for this reference");
681 return 0;
682 }
683 sym = container_of(srb, struct Symbol, symv);
684
685 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
686 sect->tail = &r->next;
687
688 r->next = NULL;
689 r->address = sect->len;
690 r->symbol = GLOBAL_TEMP_BASE + sym->globnum;
691 r->type = type;
692
693 sect->nrelocs++;
694
695 return offset - sym->symv.key;
696 }
697
698 static void elf_out(int32_t segto, const void *data,
699 enum out_type type, uint64_t size,
700 int32_t segment, int32_t wrt)
701 {
702 struct Section *s;
703 int32_t addr;
704 uint8_t mydata[8], *p;
705 int reltype, bytes;
706 int i;
707 static struct symlininfo sinfo;
708
709 /*
710 * handle absolute-assembly (structure definitions)
711 */
712 if (segto == NO_SEG) {
713 if (type != OUT_RESERVE)
714 nasm_error(ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
715 " space");
716 return;
717 }
718
719 s = NULL;
720 for (i = 0; i < nsects; i++)
721 if (segto == sects[i]->index) {
722 s = sects[i];
723 break;
724 }
725 if (!s) {
726 int tempint; /* ignored */
727 if (segto != elf_section_names(".text", 2, &tempint))
728 nasm_error(ERR_PANIC, "strange segment conditions in ELF driver");
729 else {
730 s = sects[nsects - 1];
731 i = nsects - 1;
732 }
733 }
734
735 /* again some stabs debugging stuff */
736 if (of_elf32.current_dfmt) {
737 sinfo.offset = s->len;
738 sinfo.section = i;
739 sinfo.name = s->name;
740 of_elf32.current_dfmt->debug_output(TY_STABSSYMLIN, &sinfo);
741 }
742 /* end of debugging stuff */
743
744 if (s->type == SHT_NOBITS && type != OUT_RESERVE) {
745 nasm_error(ERR_WARNING, "attempt to initialize memory in"
746 " BSS section `%s': ignored", s->name);
747 s->len += realsize(type, size);
748 return;
749 }
750
751 switch (type) {
752 case OUT_RESERVE:
753 if (s->type == SHT_PROGBITS) {
754 nasm_error(ERR_WARNING, "uninitialized space declared in"
755 " non-BSS section `%s': zeroing", s->name);
756 elf_sect_write(s, NULL, size);
757 } else
758 s->len += size;
759 break;
760
761 case OUT_RAWDATA:
762 if (segment != NO_SEG)
763 nasm_error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
764 elf_sect_write(s, data, size);
765 break;
766
767 case OUT_ADDRESS:
768 {
769 bool gnu16 = false;
770 addr = *(int64_t *)data;
771 if (segment != NO_SEG) {
772 if (segment % 2) {
773 nasm_error(ERR_NONFATAL, "ELF format does not support"
774 " segment base references");
775 } else {
776 if (wrt == NO_SEG) {
777 /*
778 * The if() is a hack to deal with compilers which
779 * don't handle switch() statements with 64-bit
780 * expressions.
781 */
782 if (size < UINT_MAX) {
783 switch ((unsigned int)size) {
784 case 1:
785 gnu16 = true;
786 elf_add_reloc(s, segment, R_386_8);
787 break;
788 case 2:
789 gnu16 = true;
790 elf_add_reloc(s, segment, R_386_16);
791 break;
792 case 4:
793 elf_add_reloc(s, segment, R_386_32);
794 break;
795 default: /* Error issued further down */
796 break;
797 }
798 }
799 } else if (wrt == elf_gotpc_sect + 1) {
800 /*
801 * The user will supply GOT relative to $$. ELF
802 * will let us have GOT relative to $. So we
803 * need to fix up the data item by $-$$.
804 */
805 addr += s->len;
806 elf_add_reloc(s, segment, R_386_GOTPC);
807 } else if (wrt == elf_gotoff_sect + 1) {
808 elf_add_reloc(s, segment, R_386_GOTOFF);
809 } else if (wrt == elf_tlsie_sect + 1) {
810 addr = elf_add_gsym_reloc(s, segment, addr,
811 R_386_TLS_IE, true);
812 } else if (wrt == elf_got_sect + 1) {
813 addr = elf_add_gsym_reloc(s, segment, addr,
814 R_386_GOT32, true);
815 } else if (wrt == elf_sym_sect + 1) {
816 if (size == 2) {
817 gnu16 = true;
818 addr = elf_add_gsym_reloc(s, segment, addr,
819 R_386_16, false);
820 } else {
821 addr = elf_add_gsym_reloc(s, segment, addr,
822 R_386_32, false);
823 }
824 } else if (wrt == elf_plt_sect + 1) {
825 nasm_error(ERR_NONFATAL, "ELF format cannot produce non-PC-"
826 "relative PLT references");
827 } else {
828 nasm_error(ERR_NONFATAL, "ELF format does not support this"
829 " use of WRT");
830 wrt = NO_SEG; /* we can at least _try_ to continue */
831 }
832 }
833 }
834 p = mydata;
835 if (gnu16) {
836 nasm_error(ERR_WARNING | ERR_WARN_GNUELF,
837 "8- or 16-bit relocations in ELF32 is a GNU extension");
838 } else if (size != 4 && segment != NO_SEG) {
839 nasm_error(ERR_NONFATAL, "Unsupported non-32-bit ELF relocation");
840 }
841 WRITEADDR(p, addr, size);
842 elf_sect_write(s, mydata, size);
843 break;
844 }
845
846 case OUT_REL1ADR:
847 bytes = 1;
848 reltype = R_386_PC8;
849 goto rel12adr;
850 case OUT_REL2ADR:
851 bytes = 2;
852 reltype = R_386_PC16;
853 goto rel12adr;
854
855 rel12adr:
856 nasm_assert(segment != segto);
857 if (segment != NO_SEG && segment % 2) {
858 nasm_error(ERR_NONFATAL, "ELF format does not support"
859 " segment base references");
860 } else {
861 if (wrt == NO_SEG) {
862 nasm_error(ERR_WARNING | ERR_WARN_GNUELF,
863 "8- or 16-bit relocations in ELF is a GNU extension");
864 elf_add_reloc(s, segment, reltype);
865 } else {
866 nasm_error(ERR_NONFATAL,
867 "Unsupported non-32-bit ELF relocation");
868 }
869 }
870 p = mydata;
871 WRITESHORT(p, *(int64_t *)data - size);
872 elf_sect_write(s, mydata, bytes);
873 break;
874
875 case OUT_REL4ADR:
876 if (segment == segto)
877 nasm_error(ERR_PANIC, "intra-segment OUT_REL4ADR");
878 if (segment != NO_SEG && segment % 2) {
879 nasm_error(ERR_NONFATAL, "ELF format does not support"
880 " segment base references");
881 } else {
882 if (wrt == NO_SEG) {
883 elf_add_reloc(s, segment, R_386_PC32);
884 } else if (wrt == elf_plt_sect + 1) {
885 elf_add_reloc(s, segment, R_386_PLT32);
886 } else if (wrt == elf_gotpc_sect + 1 ||
887 wrt == elf_gotoff_sect + 1 ||
888 wrt == elf_got_sect + 1) {
889 nasm_error(ERR_NONFATAL, "ELF format cannot produce PC-"
890 "relative GOT references");
891 } else {
892 nasm_error(ERR_NONFATAL, "ELF format does not support this"
893 " use of WRT");
894 wrt = NO_SEG; /* we can at least _try_ to continue */
895 }
896 }
897 p = mydata;
898 WRITELONG(p, *(int64_t *)data - size);
899 elf_sect_write(s, mydata, 4L);
900 break;
901
902 case OUT_REL8ADR:
903 nasm_error(ERR_NONFATAL,
904 "32-bit ELF format does not support 64-bit relocations");
905 p = mydata;
906 WRITEDLONG(p, 0);
907 elf_sect_write(s, mydata, 8L);
908 break;
909 }
910 }
911
912 static void elf_write(void)
913 {
914 int align;
915 char *p;
916 int i;
917
918 struct SAA *symtab;
919 int32_t symtablen, symtablocal;
920
921 /*
922 * Work out how many sections we will have. We have SHN_UNDEF,
923 * then the flexible user sections, then the fixed sections
924 * `.shstrtab', `.symtab' and `.strtab', then optionally
925 * relocation sections for the user sections.
926 */
927 nsections = sec_numspecial + 1;
928 if (of_elf32.current_dfmt == &df_stabs)
929 nsections += 3;
930 else if (of_elf32.current_dfmt == &df_dwarf)
931 nsections += 10;
932
933 add_sectname("", ".shstrtab");
934 add_sectname("", ".symtab");
935 add_sectname("", ".strtab");
936 for (i = 0; i < nsects; i++) {
937 nsections++; /* for the section itself */
938 if (sects[i]->head) {
939 nsections++; /* for its relocations */
940 add_sectname(".rel", sects[i]->name);
941 }
942 }
943
944 if (of_elf32.current_dfmt == &df_stabs) {
945 /* in case the debug information is wanted, just add these three sections... */
946 add_sectname("", ".stab");
947 add_sectname("", ".stabstr");
948 add_sectname(".rel", ".stab");
949 } else if (of_elf32.current_dfmt == &df_dwarf) {
950 /* the dwarf debug standard specifies the following ten sections,
951 not all of which are currently implemented,
952 although all of them are defined. */
953 add_sectname("", ".debug_aranges");
954 add_sectname(".rela", ".debug_aranges");
955 add_sectname("", ".debug_pubnames");
956 add_sectname("", ".debug_info");
957 add_sectname(".rela", ".debug_info");
958 add_sectname("", ".debug_abbrev");
959 add_sectname("", ".debug_line");
960 add_sectname(".rela", ".debug_line");
961 add_sectname("", ".debug_frame");
962 add_sectname("", ".debug_loc");
963 }
964
965 /*
966 * Output the ELF header.
967 */
968 fwrite("\177ELF\1\1\1", 7, 1, ofile);
969 fputc(elf_osabi, ofile);
970 fputc(elf_abiver, ofile);
971 fwritezero(7, ofile);
972 fwriteint16_t(1, ofile); /* ET_REL relocatable file */
973 fwriteint16_t(3, ofile); /* EM_386 processor ID */
974 fwriteint32_t(1L, ofile); /* EV_CURRENT file format version */
975 fwriteint32_t(0L, ofile); /* no entry point */
976 fwriteint32_t(0L, ofile); /* no program header table */
977 fwriteint32_t(0x40L, ofile); /* section headers straight after
978 * ELF header plus alignment */
979 fwriteint32_t(0L, ofile); /* 386 defines no special flags */
980 fwriteint16_t(0x34, ofile); /* size of ELF header */
981 fwriteint16_t(0, ofile); /* no program header table, again */
982 fwriteint16_t(0, ofile); /* still no program header table */
983 fwriteint16_t(0x28, ofile); /* size of section header */
984 fwriteint16_t(nsections, ofile); /* number of sections */
985 fwriteint16_t(sec_shstrtab, ofile); /* string table section index for
986 * section header table */
987 fwriteint32_t(0L, ofile); /* align to 0x40 bytes */
988 fwriteint32_t(0L, ofile);
989 fwriteint32_t(0L, ofile);
990
991 /*
992 * Build the symbol table and relocation tables.
993 */
994 symtab = elf_build_symtab(&symtablen, &symtablocal);
995 for (i = 0; i < nsects; i++)
996 if (sects[i]->head)
997 sects[i]->rel = elf_build_reltab(&sects[i]->rellen,
998 sects[i]->head);
999
1000 /*
1001 * Now output the section header table.
1002 */
1003
1004 elf_foffs = 0x40 + 0x28 * nsections;
1005 align = ALIGN(elf_foffs, SEC_FILEALIGN) - elf_foffs;
1006 elf_foffs += align;
1007 elf_nsect = 0;
1008 elf_sects = nasm_malloc(sizeof(*elf_sects) * nsections);
1009
1010 /* SHN_UNDEF */
1011 elf_section_header(0, SHT_NULL, 0, NULL, false, 0, SHN_UNDEF, 0, 0, 0);
1012 p = shstrtab + 1;
1013
1014 /* The normal sections */
1015 for (i = 0; i < nsects; i++) {
1016 elf_section_header(p - shstrtab, sects[i]->type, sects[i]->flags,
1017 (sects[i]->type == SHT_PROGBITS ?
1018 sects[i]->data : NULL), true,
1019 sects[i]->len, 0, 0, sects[i]->align, 0);
1020 p += strlen(p) + 1;
1021 }
1022
1023 /* .shstrtab */
1024 elf_section_header(p - shstrtab, SHT_STRTAB, 0, shstrtab, false,
1025 shstrtablen, 0, 0, 1, 0);
1026 p += strlen(p) + 1;
1027
1028 /* .symtab */
1029 elf_section_header(p - shstrtab, SHT_SYMTAB, 0, symtab, true,
1030 symtablen, sec_strtab, symtablocal, 4, 16);
1031 p += strlen(p) + 1;
1032
1033 /* .strtab */
1034 elf_section_header(p - shstrtab, SHT_STRTAB, 0, strs, true,
1035 strslen, 0, 0, 1, 0);
1036 p += strlen(p) + 1;
1037
1038 /* The relocation sections */
1039 for (i = 0; i < nsects; i++)
1040 if (sects[i]->head) {
1041 elf_section_header(p - shstrtab, SHT_REL, 0, sects[i]->rel, true,
1042 sects[i]->rellen, sec_symtab, i + 1, 4, 8);
1043 p += strlen(p) + 1;
1044 }
1045
1046 if (of_elf32.current_dfmt == &df_stabs) {
1047 /* for debugging information, create the last three sections
1048 which are the .stab , .stabstr and .rel.stab sections respectively */
1049
1050 /* this function call creates the stab sections in memory */
1051 stabs32_generate();
1052
1053 if (stabbuf && stabstrbuf && stabrelbuf) {
1054 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, stabbuf, false,
1055 stablen, sec_stabstr, 0, 4, 12);
1056 p += strlen(p) + 1;
1057
1058 elf_section_header(p - shstrtab, SHT_STRTAB, 0, stabstrbuf, false,
1059 stabstrlen, 0, 0, 4, 0);
1060 p += strlen(p) + 1;
1061
1062 /* link -> symtable info -> section to refer to */
1063 elf_section_header(p - shstrtab, SHT_REL, 0, stabrelbuf, false,
1064 stabrellen, sec_symtab, sec_stab, 4, 8);
1065 p += strlen(p) + 1;
1066 }
1067 } else if (of_elf32.current_dfmt == &df_dwarf) {
1068 /* for dwarf debugging information, create the ten dwarf sections */
1069
1070 /* this function call creates the dwarf sections in memory */
1071 if (dwarf_fsect)
1072 dwarf32_generate();
1073
1074 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, arangesbuf, false,
1075 arangeslen, 0, 0, 1, 0);
1076 p += strlen(p) + 1;
1077
1078 elf_section_header(p - shstrtab, SHT_RELA, 0, arangesrelbuf, false,
1079 arangesrellen, sec_symtab, sec_debug_aranges,
1080 1, 12);
1081 p += strlen(p) + 1;
1082
1083 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, pubnamesbuf,
1084 false, pubnameslen, 0, 0, 1, 0);
1085 p += strlen(p) + 1;
1086
1087 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, infobuf, false,
1088 infolen, 0, 0, 1, 0);
1089 p += strlen(p) + 1;
1090
1091 elf_section_header(p - shstrtab, SHT_RELA, 0, inforelbuf, false,
1092 inforellen, sec_symtab, sec_debug_info, 1, 12);
1093 p += strlen(p) + 1;
1094
1095 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, abbrevbuf, false,
1096 abbrevlen, 0, 0, 1, 0);
1097 p += strlen(p) + 1;
1098
1099 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, linebuf, false,
1100 linelen, 0, 0, 1, 0);
1101 p += strlen(p) + 1;
1102
1103 elf_section_header(p - shstrtab, SHT_RELA, 0, linerelbuf, false,
1104 linerellen, sec_symtab, sec_debug_line, 1, 12);
1105 p += strlen(p) + 1;
1106
1107 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, framebuf, false,
1108 framelen, 0, 0, 8, 0);
1109 p += strlen(p) + 1;
1110
1111 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, locbuf, false,
1112 loclen, 0, 0, 1, 0);
1113 p += strlen(p) + 1;
1114 }
1115 fwritezero(align, ofile);
1116
1117 /*
1118 * Now output the sections.
1119 */
1120 elf_write_sections();
1121
1122 nasm_free(elf_sects);
1123 saa_free(symtab);
1124 }
1125
1126 static struct SAA *elf_build_symtab(int32_t *len, int32_t *local)
1127 {
1128 struct SAA *s = saa_init(1L);
1129 struct Symbol *sym;
1130 uint8_t entry[16], *p;
1131 int i;
1132
1133 *len = *local = 0;
1134
1135 /*
1136 * First, an all-zeros entry, required by the ELF spec.
1137 */
1138 saa_wbytes(s, NULL, 16L); /* null symbol table entry */
1139 *len += 16;
1140 (*local)++;
1141
1142 /*
1143 * Next, an entry for the file name.
1144 */
1145 p = entry;
1146 WRITELONG(p, 1); /* we know it's 1st entry in strtab */
1147 WRITELONG(p, 0); /* no value */
1148 WRITELONG(p, 0); /* no size either */
1149 WRITESHORT(p, STT_FILE); /* type FILE */
1150 WRITESHORT(p, SHN_ABS);
1151 saa_wbytes(s, entry, 16L);
1152 *len += 16;
1153 (*local)++;
1154
1155 /*
1156 * Now some standard symbols defining the segments, for relocation
1157 * purposes.
1158 */
1159 for (i = 1; i <= nsects; i++) {
1160 p = entry;
1161 WRITELONG(p, 0); /* no symbol name */
1162 WRITELONG(p, 0); /* offset zero */
1163 WRITELONG(p, 0); /* size zero */
1164 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1165 WRITESHORT(p, i); /* section id */
1166 saa_wbytes(s, entry, 16L);
1167 *len += 16;
1168 (*local)++;
1169 }
1170
1171 /*
1172 * Now the other local symbols.
1173 */
1174 saa_rewind(syms);
1175 while ((sym = saa_rstruct(syms))) {
1176 if (sym->type & SYM_GLOBAL)
1177 continue;
1178 p = entry;
1179 WRITELONG(p, sym->strpos);
1180 WRITELONG(p, sym->symv.key);
1181 WRITELONG(p, sym->size);
1182 WRITECHAR(p, sym->type); /* type and binding */
1183 WRITECHAR(p, sym->other); /* visibility */
1184 WRITESHORT(p, sym->section);
1185 saa_wbytes(s, entry, 16L);
1186 *len += 16;
1187 (*local)++;
1188 }
1189 /*
1190 * dwarf needs symbols for debug sections
1191 * which are relocation targets.
1192 */
1193 //*** fix for 32 bit
1194 if (of_elf32.current_dfmt == &df_dwarf) {
1195 dwarf_infosym = *local;
1196 p = entry;
1197 WRITELONG(p, 0); /* no symbol name */
1198 WRITELONG(p, (uint32_t) 0); /* offset zero */
1199 WRITELONG(p, (uint32_t) 0); /* size zero */
1200 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1201 WRITESHORT(p, sec_debug_info); /* section id */
1202 saa_wbytes(s, entry, 16L);
1203 *len += 16;
1204 (*local)++;
1205 dwarf_abbrevsym = *local;
1206 p = entry;
1207 WRITELONG(p, 0); /* no symbol name */
1208 WRITELONG(p, (uint32_t) 0); /* offset zero */
1209 WRITELONG(p, (uint32_t) 0); /* size zero */
1210 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1211 WRITESHORT(p, sec_debug_abbrev); /* section id */
1212 saa_wbytes(s, entry, 16L);
1213 *len += 16;
1214 (*local)++;
1215 dwarf_linesym = *local;
1216 p = entry;
1217 WRITELONG(p, 0); /* no symbol name */
1218 WRITELONG(p, (uint32_t) 0); /* offset zero */
1219 WRITELONG(p, (uint32_t) 0); /* size zero */
1220 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1221 WRITESHORT(p, sec_debug_line); /* section id */
1222 saa_wbytes(s, entry, 16L);
1223 *len += 16;
1224 (*local)++;
1225 }
1226
1227 /*
1228 * Now the global symbols.
1229 */
1230 saa_rewind(syms);
1231 while ((sym = saa_rstruct(syms))) {
1232 if (!(sym->type & SYM_GLOBAL))
1233 continue;
1234 p = entry;
1235 WRITELONG(p, sym->strpos);
1236 WRITELONG(p, sym->symv.key);
1237 WRITELONG(p, sym->size);
1238 WRITECHAR(p, sym->type); /* type and binding */
1239 WRITECHAR(p, sym->other); /* visibility */
1240 WRITESHORT(p, sym->section);
1241 saa_wbytes(s, entry, 16L);
1242 *len += 16;
1243 }
1244
1245 return s;
1246 }
1247
1248 static struct SAA *elf_build_reltab(int32_t *len, struct Reloc *r)
1249 {
1250 struct SAA *s;
1251 uint8_t *p, entry[8];
1252 int32_t global_offset;
1253
1254 if (!r)
1255 return NULL;
1256
1257 s = saa_init(1L);
1258 *len = 0;
1259
1260 /*
1261 * How to onvert from a global placeholder to a real symbol index;
1262 * the +2 refers to the two special entries, the null entry and
1263 * the filename entry.
1264 */
1265 global_offset = -GLOBAL_TEMP_BASE + nsects + nlocals + ndebugs + 2;
1266
1267 while (r) {
1268 int32_t sym = r->symbol;
1269
1270 if (sym >= GLOBAL_TEMP_BASE)
1271 sym += global_offset;
1272
1273 p = entry;
1274 WRITELONG(p, r->address);
1275 WRITELONG(p, (sym << 8) + r->type);
1276 saa_wbytes(s, entry, 8L);
1277 *len += 8;
1278
1279 r = r->next;
1280 }
1281
1282 return s;
1283 }
1284
1285 static void elf_section_header(int name, int type, int flags,
1286 void *data, bool is_saa, int32_t datalen,
1287 int link, int info, int align, int eltsize)
1288 {
1289 elf_sects[elf_nsect].data = data;
1290 elf_sects[elf_nsect].len = datalen;
1291 elf_sects[elf_nsect].is_saa = is_saa;
1292 elf_nsect++;
1293
1294 fwriteint32_t((int32_t)name, ofile);
1295 fwriteint32_t((int32_t)type, ofile);
1296 fwriteint32_t((int32_t)flags, ofile);
1297 fwriteint32_t(0L, ofile); /* no address, ever, in object files */
1298 fwriteint32_t(type == 0 ? 0L : elf_foffs, ofile);
1299 fwriteint32_t(datalen, ofile);
1300 if (data)
1301 elf_foffs += ALIGN(datalen, SEC_FILEALIGN);
1302 fwriteint32_t((int32_t)link, ofile);
1303 fwriteint32_t((int32_t)info, ofile);
1304 fwriteint32_t((int32_t)align, ofile);
1305 fwriteint32_t((int32_t)eltsize, ofile);
1306 }
1307
1308 static void elf_write_sections(void)
1309 {
1310 int i;
1311 for (i = 0; i < elf_nsect; i++)
1312 if (elf_sects[i].data) {
1313 int32_t len = elf_sects[i].len;
1314 int32_t reallen = ALIGN(len, SEC_FILEALIGN);
1315 int32_t align = reallen - len;
1316 if (elf_sects[i].is_saa)
1317 saa_fpwrite(elf_sects[i].data, ofile);
1318 else
1319 fwrite(elf_sects[i].data, len, 1, ofile);
1320 fwritezero(align, ofile);
1321 }
1322 }
1323
1324 static void elf_sect_write(struct Section *sect,
1325 const uint8_t *data, uint32_t len)
1326 {
1327 saa_wbytes(sect->data, data, len);
1328 sect->len += len;
1329 }
1330
1331 static void elf_sectalign(int32_t seg, unsigned int value)
1332 {
1333 struct Section *s = NULL;
1334 int i;
1335
1336 for (i = 0; i < nsects; i++) {
1337 if (sects[i]->index == seg) {
1338 s = sects[i];
1339 break;
1340 }
1341 }
1342 if (!s || !is_power2(value))
1343 return;
1344
1345 if (value > s->align)
1346 s->align = value;
1347 }
1348
1349 static int32_t elf_segbase(int32_t segment)
1350 {
1351 return segment;
1352 }
1353
1354 static int elf_directive(enum directives directive, char *value, int pass)
1355 {
1356 bool err;
1357 int64_t n;
1358 char *p;
1359
1360 switch (directive) {
1361 case D_OSABI:
1362 if (pass == 2)
1363 return 1; /* ignore in pass 2 */
1364
1365 n = readnum(value, &err);
1366 if (err) {
1367 nasm_error(ERR_NONFATAL, "`osabi' directive requires a parameter");
1368 return 1;
1369 }
1370 if (n < 0 || n > 255) {
1371 nasm_error(ERR_NONFATAL, "valid osabi numbers are 0 to 255");
1372 return 1;
1373 }
1374 elf_osabi = n;
1375 elf_abiver = 0;
1376
1377 if ((p = strchr(value,',')) == NULL)
1378 return 1;
1379
1380 n = readnum(p+1, &err);
1381 if (err || n < 0 || n > 255) {
1382 nasm_error(ERR_NONFATAL, "invalid ABI version number (valid: 0 to 255)");
1383 return 1;
1384 }
1385
1386 elf_abiver = n;
1387 return 1;
1388
1389 default:
1390 return 0;
1391 }
1392 }
1393
1394 static void elf_filename(char *inname, char *outname)
1395 {
1396 strcpy(elf_module, inname);
1397 standard_extension(inname, outname, ".o");
1398 }
1399
1400 extern macros_t elf_stdmac[];
1401
1402 static int elf_set_info(enum geninfo type, char **val)
1403 {
1404 (void)type;
1405 (void)val;
1406 return 0;
1407 }
1408 static struct dfmt df_dwarf = {
1409 "ELF32 (i386) dwarf debug format for Linux/Unix",
1410 "dwarf",
1411 dwarf32_init,
1412 dwarf32_linenum,
1413 debug32_deflabel,
1414 debug32_directive,
1415 debug32_typevalue,
1416 dwarf32_output,
1417 dwarf32_cleanup
1418 };
1419 static struct dfmt df_stabs = {
1420 "ELF32 (i386) stabs debug format for Linux/Unix",
1421 "stabs",
1422 null_debug_init,
1423 stabs32_linenum,
1424 debug32_deflabel,
1425 debug32_directive,
1426 debug32_typevalue,
1427 stabs32_output,
1428 stabs32_cleanup
1429 };
1430
1431 struct dfmt *elf32_debugs_arr[3] = { &df_dwarf, &df_stabs, NULL };
1432
1433 struct ofmt of_elf32 = {
1434 "ELF32 (i386) object files (e.g. Linux)",
1435 "elf32",
1436 0,
1437 elf32_debugs_arr,
1438 &df_stabs,
1439 elf_stdmac,
1440 elf_init,
1441 elf_set_info,
1442 elf_out,
1443 elf_deflabel,
1444 elf_section_names,
1445 elf_sectalign,
1446 elf_segbase,
1447 elf_directive,
1448 elf_filename,
1449 elf_cleanup
1450 };
1451
1452 /* again, the stabs debugging stuff (code) */
1453
1454 static void stabs32_linenum(const char *filename, int32_t linenumber,
1455 int32_t segto)
1456 {
1457 (void)segto;
1458
1459 if (!stabs_filename) {
1460 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1461 strcpy(stabs_filename, filename);
1462 } else {
1463 if (strcmp(stabs_filename, filename)) {
1464 /*
1465 * yep, a memory leak...this program is one-shot anyway, so who cares...
1466 * in fact, this leak comes in quite handy to maintain a list of files
1467 * encountered so far in the symbol lines...
1468 */
1469
1470 /* why not nasm_free(stabs_filename); we're done with the old one */
1471
1472 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1473 strcpy(stabs_filename, filename);
1474 }
1475 }
1476 debug_immcall = 1;
1477 currentline = linenumber;
1478 }
1479
1480 static void debug32_deflabel(char *name, int32_t segment, int64_t offset, int is_global,
1481 char *special)
1482 {
1483 (void)name;
1484 (void)segment;
1485 (void)offset;
1486 (void)is_global;
1487 (void)special;
1488 }
1489
1490 static void debug32_directive(const char *directive, const char *params)
1491 {
1492 (void)directive;
1493 (void)params;
1494 }
1495
1496 static void debug32_typevalue(int32_t type)
1497 {
1498 int32_t stype, ssize;
1499 switch (TYM_TYPE(type)) {
1500 case TY_LABEL:
1501 ssize = 0;
1502 stype = STT_NOTYPE;
1503 break;
1504 case TY_BYTE:
1505 ssize = 1;
1506 stype = STT_OBJECT;
1507 break;
1508 case TY_WORD:
1509 ssize = 2;
1510 stype = STT_OBJECT;
1511 break;
1512 case TY_DWORD:
1513 ssize = 4;
1514 stype = STT_OBJECT;
1515 break;
1516 case TY_FLOAT:
1517 ssize = 4;
1518 stype = STT_OBJECT;
1519 break;
1520 case TY_QWORD:
1521 ssize = 8;
1522 stype = STT_OBJECT;
1523 break;
1524 case TY_TBYTE:
1525 ssize = 10;
1526 stype = STT_OBJECT;
1527 break;
1528 case TY_OWORD:
1529 ssize = 16;
1530 stype = STT_OBJECT;
1531 break;
1532 case TY_YWORD:
1533 ssize = 32;
1534 stype = STT_OBJECT;
1535 break;
1536 case TY_COMMON:
1537 ssize = 0;
1538 stype = STT_COMMON;
1539 break;
1540 case TY_SEG:
1541 ssize = 0;
1542 stype = STT_SECTION;
1543 break;
1544 case TY_EXTERN:
1545 ssize = 0;
1546 stype = STT_NOTYPE;
1547 break;
1548 case TY_EQU:
1549 ssize = 0;
1550 stype = STT_NOTYPE;
1551 break;
1552 default:
1553 ssize = 0;
1554 stype = STT_NOTYPE;
1555 break;
1556 }
1557 if (stype == STT_OBJECT && lastsym && !lastsym->type) {
1558 lastsym->size = ssize;
1559 lastsym->type = stype;
1560 }
1561 }
1562
1563 static void stabs32_output(int type, void *param)
1564 {
1565 struct symlininfo *s;
1566 struct linelist *el;
1567 if (type == TY_STABSSYMLIN) {
1568 if (debug_immcall) {
1569 s = (struct symlininfo *)param;
1570 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1571 return; /* line info is only collected for executable sections */
1572 numlinestabs++;
1573 el = (struct linelist *)nasm_malloc(sizeof(struct linelist));
1574 el->info.offset = s->offset;
1575 el->info.section = s->section;
1576 el->info.name = s->name;
1577 el->line = currentline;
1578 el->filename = stabs_filename;
1579 el->next = 0;
1580 if (stabslines) {
1581 stabslines->last->next = el;
1582 stabslines->last = el;
1583 } else {
1584 stabslines = el;
1585 stabslines->last = el;
1586 }
1587 }
1588 }
1589 debug_immcall = 0;
1590 }
1591
1592 /* for creating the .stab , .stabstr and .rel.stab sections in memory */
1593
1594 static void stabs32_generate(void)
1595 {
1596 int i, numfiles, strsize, numstabs = 0, currfile, mainfileindex;
1597 uint8_t *sbuf, *ssbuf, *rbuf, *sptr, *rptr;
1598 char **allfiles;
1599 int *fileidx;
1600
1601 struct linelist *ptr;
1602
1603 ptr = stabslines;
1604
1605 allfiles = (char **)nasm_malloc(numlinestabs * sizeof(char *));
1606 for (i = 0; i < numlinestabs; i++)
1607 allfiles[i] = 0;
1608 numfiles = 0;
1609 while (ptr) {
1610 if (numfiles == 0) {
1611 allfiles[0] = ptr->filename;
1612 numfiles++;
1613 } else {
1614 for (i = 0; i < numfiles; i++) {
1615 if (!strcmp(allfiles[i], ptr->filename))
1616 break;
1617 }
1618 if (i >= numfiles) {
1619 allfiles[i] = ptr->filename;
1620 numfiles++;
1621 }
1622 }
1623 ptr = ptr->next;
1624 }
1625 strsize = 1;
1626 fileidx = (int *)nasm_malloc(numfiles * sizeof(int));
1627 for (i = 0; i < numfiles; i++) {
1628 fileidx[i] = strsize;
1629 strsize += strlen(allfiles[i]) + 1;
1630 }
1631 mainfileindex = 0;
1632 for (i = 0; i < numfiles; i++) {
1633 if (!strcmp(allfiles[i], elf_module)) {
1634 mainfileindex = i;
1635 break;
1636 }
1637 }
1638
1639 /*
1640 * worst case size of the stab buffer would be:
1641 * the sourcefiles changes each line, which would mean 1 SOL, 1 SYMLIN per line
1642 * plus one "ending" entry
1643 */
1644 sbuf = (uint8_t *)nasm_malloc((numlinestabs * 2 + 4) *
1645 sizeof(struct stabentry));
1646 ssbuf = (uint8_t *)nasm_malloc(strsize);
1647 rbuf = (uint8_t *)nasm_malloc(numlinestabs * 8 * (2 + 3));
1648 rptr = rbuf;
1649
1650 for (i = 0; i < numfiles; i++)
1651 strcpy((char *)ssbuf + fileidx[i], allfiles[i]);
1652 ssbuf[0] = 0;
1653
1654 stabstrlen = strsize; /* set global variable for length of stab strings */
1655
1656 sptr = sbuf;
1657 ptr = stabslines;
1658 numstabs = 0;
1659
1660 if (ptr) {
1661 /*
1662 * this is the first stab, its strx points to the filename of the
1663 * the source-file, the n_desc field should be set to the number
1664 * of remaining stabs
1665 */
1666 WRITE_STAB(sptr, fileidx[0], 0, 0, 0, strlen(allfiles[0] + 12));
1667
1668 /* this is the stab for the main source file */
1669 WRITE_STAB(sptr, fileidx[mainfileindex], N_SO, 0, 0, 0);
1670
1671 /* relocation table entry */
1672
1673 /*
1674 * Since the symbol table has two entries before
1675 * the section symbols, the index in the info.section
1676 * member must be adjusted by adding 2
1677 */
1678
1679 WRITELONG(rptr, (sptr - sbuf) - 4);
1680 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1681
1682 numstabs++;
1683 currfile = mainfileindex;
1684 }
1685
1686 while (ptr) {
1687 if (strcmp(allfiles[currfile], ptr->filename)) {
1688 /* oops file has changed... */
1689 for (i = 0; i < numfiles; i++)
1690 if (!strcmp(allfiles[i], ptr->filename))
1691 break;
1692 currfile = i;
1693 WRITE_STAB(sptr, fileidx[currfile], N_SOL, 0, 0,
1694 ptr->info.offset);
1695 numstabs++;
1696
1697 /* relocation table entry */
1698 WRITELONG(rptr, (sptr - sbuf) - 4);
1699 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1700 }
1701
1702 WRITE_STAB(sptr, 0, N_SLINE, 0, ptr->line, ptr->info.offset);
1703 numstabs++;
1704
1705 /* relocation table entry */
1706
1707 WRITELONG(rptr, (sptr - sbuf) - 4);
1708 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1709
1710 ptr = ptr->next;
1711
1712 }
1713
1714 /* this is an "ending" token */
1715 WRITE_STAB(sptr, 0, N_SO, 0, 0, 0);
1716 numstabs++;
1717
1718 ((struct stabentry *)sbuf)->n_desc = numstabs;
1719
1720 nasm_free(allfiles);
1721 nasm_free(fileidx);
1722
1723 stablen = (sptr - sbuf);
1724 stabrellen = (rptr - rbuf);
1725 stabrelbuf = rbuf;
1726 stabbuf = sbuf;
1727 stabstrbuf = ssbuf;
1728 }
1729
1730 static void stabs32_cleanup(void)
1731 {
1732 struct linelist *ptr, *del;
1733 if (!stabslines)
1734 return;
1735
1736 ptr = stabslines;
1737 while (ptr) {
1738 del = ptr;
1739 ptr = ptr->next;
1740 nasm_free(del);
1741 }
1742
1743 nasm_free(stabbuf);
1744 nasm_free(stabrelbuf);
1745 nasm_free(stabstrbuf);
1746 }
1747
1748 /* dwarf routines */
1749
1750 static void dwarf32_init(void)
1751 {
1752 ndebugs = 3; /* 3 debug symbols */
1753 }
1754
1755 static void dwarf32_linenum(const char *filename, int32_t linenumber,
1756 int32_t segto)
1757 {
1758 (void)segto;
1759 dwarf32_findfile(filename);
1760 debug_immcall = 1;
1761 currentline = linenumber;
1762 }
1763
1764 /* called from elf_out with type == TY_DEBUGSYMLIN */
1765 static void dwarf32_output(int type, void *param)
1766 {
1767 int ln, aa, inx, maxln, soc;
1768 struct symlininfo *s;
1769 struct SAA *plinep;
1770
1771 (void)type;
1772
1773 s = (struct symlininfo *)param;
1774
1775 /* line number info is only gathered for executable sections */
1776 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1777 return;
1778
1779 /* Check if section index has changed */
1780 if (!(dwarf_csect && (dwarf_csect->section) == (s->section)))
1781 dwarf32_findsect(s->section);
1782
1783 /* do nothing unless line or file has changed */
1784 if (!debug_immcall)
1785 return;
1786
1787 ln = currentline - dwarf_csect->line;
1788 aa = s->offset - dwarf_csect->offset;
1789 inx = dwarf_clist->line;
1790 plinep = dwarf_csect->psaa;
1791 /* check for file change */
1792 if (!(inx == dwarf_csect->file)) {
1793 saa_write8(plinep,DW_LNS_set_file);
1794 saa_write8(plinep,inx);
1795 dwarf_csect->file = inx;
1796 }
1797 /* check for line change */
1798 if (ln) {
1799 /* test if in range of special op code */
1800 maxln = line_base + line_range;
1801 soc = (ln - line_base) + (line_range * aa) + opcode_base;
1802 if (ln >= line_base && ln < maxln && soc < 256) {
1803 saa_write8(plinep,soc);
1804 } else {
1805 saa_write8(plinep,DW_LNS_advance_line);
1806 saa_wleb128s(plinep,ln);
1807 if (aa) {
1808 saa_write8(plinep,DW_LNS_advance_pc);
1809 saa_wleb128u(plinep,aa);
1810 }
1811 }
1812 dwarf_csect->line = currentline;
1813 dwarf_csect->offset = s->offset;
1814 }
1815
1816 /* show change handled */
1817 debug_immcall = 0;
1818 }
1819
1820
1821 static void dwarf32_generate(void)
1822 {
1823 uint8_t *pbuf;
1824 int indx;
1825 struct linelist *ftentry;
1826 struct SAA *paranges, *ppubnames, *pinfo, *pabbrev, *plines, *plinep;
1827 struct SAA *parangesrel, *plinesrel, *pinforel;
1828 struct sectlist *psect;
1829 size_t saalen, linepoff, totlen, highaddr;
1830
1831 /* write epilogues for each line program range */
1832 /* and build aranges section */
1833 paranges = saa_init(1L);
1834 parangesrel = saa_init(1L);
1835 saa_write16(paranges,2); /* dwarf version */
1836 saa_write32(parangesrel, paranges->datalen+4);
1837 saa_write32(parangesrel, (dwarf_infosym << 8) + R_386_32); /* reloc to info */
1838 saa_write32(parangesrel, 0);
1839 saa_write32(paranges,0); /* offset into info */
1840 saa_write8(paranges,4); /* pointer size */
1841 saa_write8(paranges,0); /* not segmented */
1842 saa_write32(paranges,0); /* padding */
1843 /* iterate though sectlist entries */
1844 psect = dwarf_fsect;
1845 totlen = 0;
1846 highaddr = 0;
1847 for (indx = 0; indx < dwarf_nsections; indx++) {
1848 plinep = psect->psaa;
1849 /* Line Number Program Epilogue */
1850 saa_write8(plinep,2); /* std op 2 */
1851 saa_write8(plinep,(sects[psect->section]->len)-psect->offset);
1852 saa_write8(plinep,DW_LNS_extended_op);
1853 saa_write8(plinep,1); /* operand length */
1854 saa_write8(plinep,DW_LNE_end_sequence);
1855 totlen += plinep->datalen;
1856 /* range table relocation entry */
1857 saa_write32(parangesrel, paranges->datalen + 4);
1858 saa_write32(parangesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
1859 saa_write32(parangesrel, (uint32_t) 0);
1860 /* range table entry */
1861 saa_write32(paranges,0x0000); /* range start */
1862 saa_write32(paranges,sects[psect->section]->len); /* range length */
1863 highaddr += sects[psect->section]->len;
1864 /* done with this entry */
1865 psect = psect->next;
1866 }
1867 saa_write32(paranges,0); /* null address */
1868 saa_write32(paranges,0); /* null length */
1869 saalen = paranges->datalen;
1870 arangeslen = saalen + 4;
1871 arangesbuf = pbuf = nasm_malloc(arangeslen);
1872 WRITELONG(pbuf,saalen); /* initial length */
1873 saa_rnbytes(paranges, pbuf, saalen);
1874 saa_free(paranges);
1875
1876 /* build rela.aranges section */
1877 arangesrellen = saalen = parangesrel->datalen;
1878 arangesrelbuf = pbuf = nasm_malloc(arangesrellen);
1879 saa_rnbytes(parangesrel, pbuf, saalen);
1880 saa_free(parangesrel);
1881
1882 /* build pubnames section */
1883 ppubnames = saa_init(1L);
1884 saa_write16(ppubnames,3); /* dwarf version */
1885 saa_write32(ppubnames,0); /* offset into info */
1886 saa_write32(ppubnames,0); /* space used in info */
1887 saa_write32(ppubnames,0); /* end of list */
1888 saalen = ppubnames->datalen;
1889 pubnameslen = saalen + 4;
1890 pubnamesbuf = pbuf = nasm_malloc(pubnameslen);
1891 WRITELONG(pbuf,saalen); /* initial length */
1892 saa_rnbytes(ppubnames, pbuf, saalen);
1893 saa_free(ppubnames);
1894
1895 /* build info section */
1896 pinfo = saa_init(1L);
1897 pinforel = saa_init(1L);
1898 saa_write16(pinfo,2); /* dwarf version */
1899 saa_write32(pinforel, pinfo->datalen + 4);
1900 saa_write32(pinforel, (dwarf_abbrevsym << 8) + R_386_32); /* reloc to abbrev */
1901 saa_write32(pinforel, 0);
1902 saa_write32(pinfo,0); /* offset into abbrev */
1903 saa_write8(pinfo,4); /* pointer size */
1904 saa_write8(pinfo,1); /* abbrviation number LEB128u */
1905 saa_write32(pinforel, pinfo->datalen + 4);
1906 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
1907 saa_write32(pinforel, 0);
1908 saa_write32(pinfo,0); /* DW_AT_low_pc */
1909 saa_write32(pinforel, pinfo->datalen + 4);
1910 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
1911 saa_write32(pinforel, 0);
1912 saa_write32(pinfo,highaddr); /* DW_AT_high_pc */
1913 saa_write32(pinforel, pinfo->datalen + 4);
1914 saa_write32(pinforel, (dwarf_linesym << 8) + R_386_32); /* reloc to line */
1915 saa_write32(pinforel, 0);
1916 saa_write32(pinfo,0); /* DW_AT_stmt_list */
1917 saa_wbytes(pinfo, elf_module, strlen(elf_module)+1);
1918 saa_wbytes(pinfo, nasm_signature, strlen(nasm_signature)+1);
1919 saa_write16(pinfo,DW_LANG_Mips_Assembler);
1920 saa_write8(pinfo,2); /* abbrviation number LEB128u */
1921 saa_write32(pinforel, pinfo->datalen + 4);
1922 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
1923 saa_write32(pinforel, 0);
1924 saa_write32(pinfo,0); /* DW_AT_low_pc */
1925 saa_write32(pinfo,0); /* DW_AT_frame_base */
1926 saa_write8(pinfo,0); /* end of entries */
1927 saalen = pinfo->datalen;
1928 infolen = saalen + 4;
1929 infobuf = pbuf = nasm_malloc(infolen);
1930 WRITELONG(pbuf,saalen); /* initial length */
1931 saa_rnbytes(pinfo, pbuf, saalen);
1932 saa_free(pinfo);
1933
1934 /* build rela.info section */
1935 inforellen = saalen = pinforel->datalen;
1936 inforelbuf = pbuf = nasm_malloc(inforellen);
1937 saa_rnbytes(pinforel, pbuf, saalen);
1938 saa_free(pinforel);
1939
1940 /* build abbrev section */
1941 pabbrev = saa_init(1L);
1942 saa_write8(pabbrev,1); /* entry number LEB128u */
1943 saa_write8(pabbrev,DW_TAG_compile_unit); /* tag LEB128u */
1944 saa_write8(pabbrev,1); /* has children */
1945 /* the following attributes and forms are all LEB128u values */
1946 saa_write8(pabbrev,DW_AT_low_pc);
1947 saa_write8(pabbrev,DW_FORM_addr);
1948 saa_write8(pabbrev,DW_AT_high_pc);
1949 saa_write8(pabbrev,DW_FORM_addr);
1950 saa_write8(pabbrev,DW_AT_stmt_list);
1951 saa_write8(pabbrev,DW_FORM_data4);
1952 saa_write8(pabbrev,DW_AT_name);
1953 saa_write8(pabbrev,DW_FORM_string);
1954 saa_write8(pabbrev,DW_AT_producer);
1955 saa_write8(pabbrev,DW_FORM_string);
1956 saa_write8(pabbrev,DW_AT_language);
1957 saa_write8(pabbrev,DW_FORM_data2);
1958 saa_write16(pabbrev,0); /* end of entry */
1959 /* LEB128u usage same as above */
1960 saa_write8(pabbrev,2); /* entry number */
1961 saa_write8(pabbrev,DW_TAG_subprogram);
1962 saa_write8(pabbrev,0); /* no children */
1963 saa_write8(pabbrev,DW_AT_low_pc);
1964 saa_write8(pabbrev,DW_FORM_addr);
1965 saa_write8(pabbrev,DW_AT_frame_base);
1966 saa_write8(pabbrev,DW_FORM_data4);
1967 saa_write16(pabbrev,0); /* end of entry */
1968 abbrevlen = saalen = pabbrev->datalen;
1969 abbrevbuf = pbuf = nasm_malloc(saalen);
1970 saa_rnbytes(pabbrev, pbuf, saalen);
1971 saa_free(pabbrev);
1972
1973 /* build line section */
1974 /* prolog */
1975 plines = saa_init(1L);
1976 saa_write8(plines,1); /* Minimum Instruction Length */
1977 saa_write8(plines,1); /* Initial value of 'is_stmt' */
1978 saa_write8(plines,line_base); /* Line Base */
1979 saa_write8(plines,line_range); /* Line Range */
1980 saa_write8(plines,opcode_base); /* Opcode Base */
1981 /* standard opcode lengths (# of LEB128u operands) */
1982 saa_write8(plines,0); /* Std opcode 1 length */
1983 saa_write8(plines,1); /* Std opcode 2 length */
1984 saa_write8(plines,1); /* Std opcode 3 length */
1985 saa_write8(plines,1); /* Std opcode 4 length */
1986 saa_write8(plines,1); /* Std opcode 5 length */
1987 saa_write8(plines,0); /* Std opcode 6 length */
1988 saa_write8(plines,0); /* Std opcode 7 length */
1989 saa_write8(plines,0); /* Std opcode 8 length */
1990 saa_write8(plines,1); /* Std opcode 9 length */
1991 saa_write8(plines,0); /* Std opcode 10 length */
1992 saa_write8(plines,0); /* Std opcode 11 length */
1993 saa_write8(plines,1); /* Std opcode 12 length */
1994 /* Directory Table */
1995 saa_write8(plines,0); /* End of table */
1996 /* File Name Table */
1997 ftentry = dwarf_flist;
1998 for (indx = 0; indx < dwarf_numfiles; indx++) {
1999 saa_wbytes(plines, ftentry->filename, (int32_t)(strlen(ftentry->filename) + 1));
2000 saa_write8(plines,0); /* directory LEB128u */
2001 saa_write8(plines,0); /* time LEB128u */
2002 saa_write8(plines,0); /* size LEB128u */
2003 ftentry = ftentry->next;
2004 }
2005 saa_write8(plines,0); /* End of table */
2006 linepoff = plines->datalen;
2007 linelen = linepoff + totlen + 10;
2008 linebuf = pbuf = nasm_malloc(linelen);
2009 WRITELONG(pbuf,linelen-4); /* initial length */
2010 WRITESHORT(pbuf,3); /* dwarf version */
2011 WRITELONG(pbuf,linepoff); /* offset to line number program */
2012 /* write line header */
2013 saalen = linepoff;
2014 saa_rnbytes(plines, pbuf, saalen); /* read a given no. of bytes */
2015 pbuf += linepoff;
2016 saa_free(plines);
2017 /* concatonate line program ranges */
2018 linepoff += 13;
2019 plinesrel = saa_init(1L);
2020 psect = dwarf_fsect;
2021 for (indx = 0; indx < dwarf_nsections; indx++) {
2022 saa_write32(plinesrel, linepoff);
2023 saa_write32(plinesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
2024 saa_write32(plinesrel, (uint32_t) 0);
2025 plinep = psect->psaa;
2026 saalen = plinep->datalen;
2027 saa_rnbytes(plinep, pbuf, saalen);
2028 pbuf += saalen;
2029 linepoff += saalen;
2030 saa_free(plinep);
2031 /* done with this entry */
2032 psect = psect->next;
2033 }
2034
2035
2036 /* build rela.lines section */
2037 linerellen =saalen = plinesrel->datalen;
2038 linerelbuf = pbuf = nasm_malloc(linerellen);
2039 saa_rnbytes(plinesrel, pbuf, saalen);
2040 saa_free(plinesrel);
2041
2042 /* build frame section */
2043 framelen = 4;
2044 framebuf = pbuf = nasm_malloc(framelen);
2045 WRITELONG(pbuf,framelen-4); /* initial length */
2046
2047 /* build loc section */
2048 loclen = 16;
2049 locbuf = pbuf = nasm_malloc(loclen);
2050 WRITELONG(pbuf,0); /* null beginning offset */
2051 WRITELONG(pbuf,0); /* null ending offset */
2052 }
2053
2054 static void dwarf32_cleanup(void)
2055 {
2056 nasm_free(arangesbuf);
2057 nasm_free(arangesrelbuf);
2058 nasm_free(pubnamesbuf);
2059 nasm_free(infobuf);
2060 nasm_free(inforelbuf);
2061 nasm_free(abbrevbuf);
2062 nasm_free(linebuf);
2063 nasm_free(linerelbuf);
2064 nasm_free(framebuf);
2065 nasm_free(locbuf);
2066 }
2067
2068 static void dwarf32_findfile(const char * fname)
2069 {
2070 int finx;
2071 struct linelist *match;
2072
2073 /* return if fname is current file name */
2074 if (dwarf_clist && !(strcmp(fname, dwarf_clist->filename)))
2075 return;
2076
2077 /* search for match */
2078 match = 0;
2079 if (dwarf_flist) {
2080 match = dwarf_flist;
2081 for (finx = 0; finx < dwarf_numfiles; finx++) {
2082 if (!(strcmp(fname, match->filename))) {
2083 dwarf_clist = match;
2084 return;
2085 }
2086 }
2087 }
2088
2089 /* add file name to end of list */
2090 dwarf_clist = (struct linelist *)nasm_malloc(sizeof(struct linelist));
2091 dwarf_numfiles++;
2092 dwarf_clist->line = dwarf_numfiles;
2093 dwarf_clist->filename = nasm_malloc(strlen(fname) + 1);
2094 strcpy(dwarf_clist->filename,fname);
2095 dwarf_clist->next = 0;
2096 if (!dwarf_flist) { /* if first entry */
2097 dwarf_flist = dwarf_elist = dwarf_clist;
2098 dwarf_clist->last = 0;
2099 } else { /* chain to previous entry */
2100 dwarf_elist->next = dwarf_clist;
2101 dwarf_elist = dwarf_clist;
2102 }
2103 }
2104
2105 static void dwarf32_findsect(const int index)
2106 {
2107 int sinx;
2108 struct sectlist *match;
2109 struct SAA *plinep;
2110
2111 /* return if index is current section index */
2112 if (dwarf_csect && (dwarf_csect->section == index))
2113 return;
2114
2115 /* search for match */
2116 match = 0;
2117 if (dwarf_fsect) {
2118 match = dwarf_fsect;
2119 for (sinx = 0; sinx < dwarf_nsections; sinx++) {
2120 if (match->section == index) {
2121 dwarf_csect = match;
2122 return;
2123 }
2124 match = match->next;
2125 }
2126 }
2127
2128 /* add entry to end of list */
2129 dwarf_csect = (struct sectlist *)nasm_malloc(sizeof(struct sectlist));
2130 dwarf_nsections++;
2131 dwarf_csect->psaa = plinep = saa_init(1L);
2132 dwarf_csect->line = 1;
2133 dwarf_csect->offset = 0;
2134 dwarf_csect->file = 1;
2135 dwarf_csect->section = index;
2136 dwarf_csect->next = 0;
2137 /* set relocatable address at start of line program */
2138 saa_write8(plinep,DW_LNS_extended_op);
2139 saa_write8(plinep,5); /* operand length */
2140 saa_write8(plinep,DW_LNE_set_address);
2141 saa_write32(plinep,0); /* Start Address */
2142
2143 if (!dwarf_fsect) { /* if first entry */
2144 dwarf_fsect = dwarf_esect = dwarf_csect;
2145 dwarf_csect->last = 0;
2146 } else { /* chain to previous entry */
2147 dwarf_esect->next = dwarf_csect;
2148 dwarf_esect = dwarf_csect;
2149 }
2150 }
2151
2152 #endif /* OF_ELF */
Adding AVX-512 features