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NASM 2.08rc5
[nasm/avx512.git] / output / outelf32.c
blobde318056ebe9d525654cad57f84ebed43b0ec4c4
1 /* ----------------------------------------------------------------------- *
2 *
3 * Copyright 1996-2009 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
47 #include "nasm.h"
48 #include "nasmlib.h"
49 #include "saa.h"
50 #include "raa.h"
51 #include "stdscan.h"
52 #include "eval.h"
53 #include "output/outform.h"
54 #include "output/outlib.h"
55 #include "rbtree.h"
56
57 #include "output/dwarf.h"
58 #include "output/elf.h"
59 #include "output/outelf.h"
60
61 #ifdef OF_ELF32
62
63 /*
64 * Relocation types.
65 */
66 struct Reloc {
67 struct Reloc *next;
68 int32_t address; /* relative to _start_ of section */
69 int32_t symbol; /* symbol index */
70 int type; /* type of relocation */
71 };
72
73 struct Symbol {
74 struct rbtree symv; /* symbol value and symbol rbtree */
75 int32_t strpos; /* string table position of name */
76 int32_t section; /* section ID of the symbol */
77 int type; /* symbol type */
78 int other; /* symbol visibility */
79 int32_t size; /* size of symbol */
80 int32_t globnum; /* symbol table offset if global */
81 struct Symbol *nextfwd; /* list of unresolved-size symbols */
82 char *name; /* used temporarily if in above list */
83 };
84
85 struct Section {
86 struct SAA *data;
87 uint32_t len, size, nrelocs;
88 int32_t index;
89 int type; /* SHT_PROGBITS or SHT_NOBITS */
90 uint32_t align; /* alignment: power of two */
91 uint32_t flags; /* section flags */
92 char *name;
93 struct SAA *rel;
94 int32_t rellen;
95 struct Reloc *head, **tail;
96 struct rbtree *gsyms; /* global symbols in section */
97 };
98
99 #define SECT_DELTA 32
100 static struct Section **sects;
101 static int nsects, sectlen;
102
103 #define SHSTR_DELTA 256
104 static char *shstrtab;
105 static int shstrtablen, shstrtabsize;
106
107 static struct SAA *syms;
108 static uint32_t nlocals, nglobs, ndebugs; /* Symbol counts */
109
110 static int32_t def_seg;
111
112 static struct RAA *bsym;
113
114 static struct SAA *strs;
115 static uint32_t strslen;
116
117 static struct Symbol *fwds;
118
119 static char elf_module[FILENAME_MAX];
120
121 static uint8_t elf_osabi = 0; /* Default OSABI = 0 (System V or Linux) */
122 static uint8_t elf_abiver = 0; /* Current ABI version */
123
124 extern struct ofmt of_elf32;
125 extern struct ofmt of_elf;
126
127 #define SOC(ln,aa) ln - line_base + (line_range * aa) + opcode_base
128
129 static struct ELF_SECTDATA {
130 void *data;
131 int32_t len;
132 bool is_saa;
133 } *elf_sects;
134 static int elf_nsect, nsections;
135 static int32_t elf_foffs;
136
137 static void elf_write(void);
138 static void elf_sect_write(struct Section *, const uint8_t *,
139 uint32_t);
140 static void elf_section_header(int, int, int, void *, bool, int32_t, int, int,
141 int, int);
142 static void elf_write_sections(void);
143 static struct SAA *elf_build_symtab(int32_t *, int32_t *);
144 static struct SAA *elf_build_reltab(int32_t *, struct Reloc *);
145 static void add_sectname(char *, char *);
146
147 struct stabentry {
148 uint32_t n_strx;
149 uint8_t n_type;
150 uint8_t n_other;
151 uint16_t n_desc;
152 uint32_t n_value;
153 };
154
155 struct erel {
156 int offset, info;
157 };
158
159 struct symlininfo {
160 int offset;
161 int section; /* section index */
162 char *name; /* shallow-copied pointer of section name */
163 };
164
165 struct linelist {
166 struct symlininfo info;
167 int line;
168 char *filename;
169 struct linelist *next;
170 struct linelist *last;
171 };
172
173 struct sectlist {
174 struct SAA *psaa;
175 int section;
176 int line;
177 int offset;
178 int file;
179 struct sectlist *next;
180 struct sectlist *last;
181 };
182
183 /* common debug variables */
184 static int currentline = 1;
185 static int debug_immcall = 0;
186
187 /* stabs debug variables */
188 static struct linelist *stabslines = 0;
189 static int numlinestabs = 0;
190 static char *stabs_filename = 0;
191 static uint8_t *stabbuf = 0, *stabstrbuf = 0, *stabrelbuf = 0;
192 static int stablen, stabstrlen, stabrellen;
193
194 /* dwarf debug variables */
195 static struct linelist *dwarf_flist = 0, *dwarf_clist = 0, *dwarf_elist = 0;
196 static struct sectlist *dwarf_fsect = 0, *dwarf_csect = 0, *dwarf_esect = 0;
197 static int dwarf_numfiles = 0, dwarf_nsections;
198 static uint8_t *arangesbuf = 0, *arangesrelbuf = 0, *pubnamesbuf = 0, *infobuf = 0, *inforelbuf = 0,
199 *abbrevbuf = 0, *linebuf = 0, *linerelbuf = 0, *framebuf = 0, *locbuf = 0;
200 static int8_t line_base = -5, line_range = 14, opcode_base = 13;
201 static int arangeslen, arangesrellen, pubnameslen, infolen, inforellen,
202 abbrevlen, linelen, linerellen, framelen, loclen;
203 static int32_t dwarf_infosym, dwarf_abbrevsym, dwarf_linesym;
204
205 static struct dfmt df_dwarf;
206 static struct dfmt df_stabs;
207 static struct Symbol *lastsym;
208
209 /* common debugging routines */
210 static void debug32_typevalue(int32_t);
211 static void debug32_deflabel(char *, int32_t, int64_t, int, char *);
212 static void debug32_directive(const char *, const char *);
213
214 /* stabs debugging routines */
215 static void stabs32_linenum(const char *filename, int32_t linenumber, int32_t);
216 static void stabs32_output(int, void *);
217 static void stabs32_generate(void);
218 static void stabs32_cleanup(void);
219
220 /* dwarf debugging routines */
221 static void dwarf32_init(void);
222 static void dwarf32_linenum(const char *filename, int32_t linenumber, int32_t);
223 static void dwarf32_output(int, void *);
224 static void dwarf32_generate(void);
225 static void dwarf32_cleanup(void);
226 static void dwarf32_findfile(const char *);
227 static void dwarf32_findsect(const int);
228
229 /*
230 * Special NASM section numbers which are used to define ELF special
231 * symbols, which can be used with WRT to provide PIC and TLS
232 * relocation types.
233 */
234 static int32_t elf_gotpc_sect, elf_gotoff_sect;
235 static int32_t elf_got_sect, elf_plt_sect;
236 static int32_t elf_sym_sect, elf_tlsie_sect;
237
238 static void elf_init(void)
239 {
240 sects = NULL;
241 nsects = sectlen = 0;
242 syms = saa_init((int32_t)sizeof(struct Symbol));
243 nlocals = nglobs = ndebugs = 0;
244 bsym = raa_init();
245 strs = saa_init(1L);
246 saa_wbytes(strs, "\0", 1L);
247 saa_wbytes(strs, elf_module, strlen(elf_module)+1);
248 strslen = 2 + strlen(elf_module);
249 shstrtab = NULL;
250 shstrtablen = shstrtabsize = 0;;
251 add_sectname("", "");
252
253 fwds = NULL;
254
255 elf_gotpc_sect = seg_alloc();
256 define_label("..gotpc", elf_gotpc_sect + 1, 0L, NULL, false, false);
257 elf_gotoff_sect = seg_alloc();
258 define_label("..gotoff", elf_gotoff_sect + 1, 0L, NULL, false, false);
259 elf_got_sect = seg_alloc();
260 define_label("..got", elf_got_sect + 1, 0L, NULL, false, false);
261 elf_plt_sect = seg_alloc();
262 define_label("..plt", elf_plt_sect + 1, 0L, NULL, false, false);
263 elf_sym_sect = seg_alloc();
264 define_label("..sym", elf_sym_sect + 1, 0L, NULL, false, false);
265 elf_tlsie_sect = seg_alloc();
266 define_label("..tlsie", elf_tlsie_sect + 1, 0L, NULL, false, false);
267
268 def_seg = seg_alloc();
269 }
270
271 static void elf_init_hack(void)
272 {
273 of_elf32.current_dfmt = of_elf.current_dfmt; /* Sync debugging format */
274 elf_init();
275 }
276
277 static void elf_cleanup(int debuginfo)
278 {
279 struct Reloc *r;
280 int i;
281
282 (void)debuginfo;
283
284 elf_write();
285 for (i = 0; i < nsects; i++) {
286 if (sects[i]->type != SHT_NOBITS)
287 saa_free(sects[i]->data);
288 if (sects[i]->head)
289 saa_free(sects[i]->rel);
290 while (sects[i]->head) {
291 r = sects[i]->head;
292 sects[i]->head = sects[i]->head->next;
293 nasm_free(r);
294 }
295 }
296 nasm_free(sects);
297 saa_free(syms);
298 raa_free(bsym);
299 saa_free(strs);
300 if (of_elf32.current_dfmt) {
301 of_elf32.current_dfmt->cleanup();
302 }
303 }
304
305 static void add_sectname(char *firsthalf, char *secondhalf)
306 {
307 int len = strlen(firsthalf) + strlen(secondhalf);
308 while (shstrtablen + len + 1 > shstrtabsize)
309 shstrtab = nasm_realloc(shstrtab, (shstrtabsize += SHSTR_DELTA));
310 strcpy(shstrtab + shstrtablen, firsthalf);
311 strcat(shstrtab + shstrtablen, secondhalf);
312 shstrtablen += len + 1;
313 }
314
315 static int elf_make_section(char *name, int type, int flags, int align)
316 {
317 struct Section *s;
318
319 s = nasm_malloc(sizeof(*s));
320
321 if (type != SHT_NOBITS)
322 s->data = saa_init(1L);
323 s->head = NULL;
324 s->tail = &s->head;
325 s->len = s->size = 0;
326 s->nrelocs = 0;
327 if (!strcmp(name, ".text"))
328 s->index = def_seg;
329 else
330 s->index = seg_alloc();
331 add_sectname("", name);
332 s->name = nasm_malloc(1 + strlen(name));
333 strcpy(s->name, name);
334 s->type = type;
335 s->flags = flags;
336 s->align = align;
337 s->gsyms = NULL;
338
339 if (nsects >= sectlen)
340 sects = nasm_realloc(sects, (sectlen += SECT_DELTA) * sizeof(*sects));
341 sects[nsects++] = s;
342
343 return nsects - 1;
344 }
345
346
347 static int32_t elf_section_names(char *name, int pass, int *bits)
348 {
349 char *p;
350 uint32_t flags, flags_and, flags_or;
351 uint32_t align;
352 int type, i;
353
354 /*
355 * Default is 32 bits.
356 */
357 if (!name) {
358 *bits = 32;
359 return def_seg;
360 }
361
362 p = nasm_skip_word(name);
363 if (*p)
364 *p++ = '\0';
365 flags_and = flags_or = type = align = 0;
366
367 p = nasm_skip_spaces(p);
368 while (*p) {
369 char *q = p;
370 p = nasm_skip_word(p);
371 if (*p)
372 *p++ = '\0';
373 p = nasm_skip_spaces(p);
374
375 if (!nasm_strnicmp(q, "align=", 6)) {
376 align = atoi(q + 6);
377 if (align == 0)
378 align = 1;
379 if ((align - 1) & align) { /* means it's not a power of two */
380 nasm_error(ERR_NONFATAL, "section alignment %d is not"
381 " a power of two", align);
382 align = 1;
383 }
384 } else if (!nasm_stricmp(q, "alloc")) {
385 flags_and |= SHF_ALLOC;
386 flags_or |= SHF_ALLOC;
387 } else if (!nasm_stricmp(q, "noalloc")) {
388 flags_and |= SHF_ALLOC;
389 flags_or &= ~SHF_ALLOC;
390 } else if (!nasm_stricmp(q, "exec")) {
391 flags_and |= SHF_EXECINSTR;
392 flags_or |= SHF_EXECINSTR;
393 } else if (!nasm_stricmp(q, "noexec")) {
394 flags_and |= SHF_EXECINSTR;
395 flags_or &= ~SHF_EXECINSTR;
396 } else if (!nasm_stricmp(q, "write")) {
397 flags_and |= SHF_WRITE;
398 flags_or |= SHF_WRITE;
399 } else if (!nasm_stricmp(q, "tls")) {
400 flags_and |= SHF_TLS;
401 flags_or |= SHF_TLS;
402 } else if (!nasm_stricmp(q, "nowrite")) {
403 flags_and |= SHF_WRITE;
404 flags_or &= ~SHF_WRITE;
405 } else if (!nasm_stricmp(q, "progbits")) {
406 type = SHT_PROGBITS;
407 } else if (!nasm_stricmp(q, "nobits")) {
408 type = SHT_NOBITS;
409 } else if (pass == 1) {
410 nasm_error(ERR_WARNING, "Unknown section attribute '%s' ignored on"
411 " declaration of section `%s'", q, name);
412 }
413 }
414
415 if (!strcmp(name, ".shstrtab") ||
416 !strcmp(name, ".symtab") ||
417 !strcmp(name, ".strtab")) {
418 nasm_error(ERR_NONFATAL, "attempt to redefine reserved section"
419 "name `%s'", name);
420 return NO_SEG;
421 }
422
423 for (i = 0; i < nsects; i++)
424 if (!strcmp(name, sects[i]->name))
425 break;
426 if (i == nsects) {
427 const struct elf_known_section *ks = elf_known_sections;
428
429 while (ks->name) {
430 if (!strcmp(name, ks->name))
431 break;
432 ks++;
433 }
434
435 type = type ? type : ks->type;
436 align = align ? align : ks->align;
437 flags = (ks->flags & ~flags_and) | flags_or;
438
439 i = elf_make_section(name, type, flags, align);
440 } else if (pass == 1) {
441 if ((type && sects[i]->type != type)
442 || (align && sects[i]->align != align)
443 || (flags_and && ((sects[i]->flags & flags_and) != flags_or)))
444 nasm_error(ERR_WARNING, "section attributes ignored on"
445 " redeclaration of section `%s'", name);
446 }
447
448 return sects[i]->index;
449 }
450
451 static void elf_deflabel(char *name, int32_t segment, int64_t offset,
452 int is_global, char *special)
453 {
454 int pos = strslen;
455 struct Symbol *sym;
456 bool special_used = false;
457
458 #if defined(DEBUG) && DEBUG>2
459 nasm_error(ERR_DEBUG,
460 " elf_deflabel: %s, seg=%"PRIx32", off=%"PRIx64", is_global=%d, %s\n",
461 name, segment, offset, is_global, special);
462 #endif
463 if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
464 /*
465 * This is a NASM special symbol. We never allow it into
466 * the ELF symbol table, even if it's a valid one. If it
467 * _isn't_ a valid one, we should barf immediately.
468 */
469 if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") &&
470 strcmp(name, "..got") && strcmp(name, "..plt") &&
471 strcmp(name, "..sym") && strcmp(name, "..tlsie"))
472 nasm_error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
473 return;
474 }
475
476 if (is_global == 3) {
477 struct Symbol **s;
478 /*
479 * Fix up a forward-reference symbol size from the first
480 * pass.
481 */
482 for (s = &fwds; *s; s = &(*s)->nextfwd)
483 if (!strcmp((*s)->name, name)) {
484 struct tokenval tokval;
485 expr *e;
486 char *p = nasm_skip_spaces(nasm_skip_word(special));
487
488 stdscan_reset();
489 stdscan_set(p);
490 tokval.t_type = TOKEN_INVALID;
491 e = evaluate(stdscan, NULL, &tokval, NULL, 1, nasm_error, NULL);
492 if (e) {
493 if (!is_simple(e))
494 nasm_error(ERR_NONFATAL, "cannot use relocatable"
495 " expression as symbol size");
496 else
497 (*s)->size = reloc_value(e);
498 }
499
500 /*
501 * Remove it from the list of unresolved sizes.
502 */
503 nasm_free((*s)->name);
504 *s = (*s)->nextfwd;
505 return;
506 }
507 return; /* it wasn't an important one */
508 }
509
510 saa_wbytes(strs, name, (int32_t)(1 + strlen(name)));
511 strslen += 1 + strlen(name);
512
513 lastsym = sym = saa_wstruct(syms);
514
515 memset(&sym->symv, 0, sizeof(struct rbtree));
516
517 sym->strpos = pos;
518 sym->type = is_global ? SYM_GLOBAL : 0;
519 sym->other = STV_DEFAULT;
520 sym->size = 0;
521 if (segment == NO_SEG)
522 sym->section = SHN_ABS;
523 else {
524 int i;
525 sym->section = SHN_UNDEF;
526 if (nsects == 0 && segment == def_seg) {
527 int tempint;
528 if (segment != elf_section_names(".text", 2, &tempint))
529 nasm_error(ERR_PANIC,
530 "strange segment conditions in ELF driver");
531 sym->section = nsects;
532 } else {
533 for (i = 0; i < nsects; i++)
534 if (segment == sects[i]->index) {
535 sym->section = i + 1;
536 break;
537 }
538 }
539 }
540
541 if (is_global == 2) {
542 sym->size = offset;
543 sym->symv.key = 0;
544 sym->section = SHN_COMMON;
545 /*
546 * We have a common variable. Check the special text to see
547 * if it's a valid number and power of two; if so, store it
548 * as the alignment for the common variable.
549 */
550 if (special) {
551 bool err;
552 sym->symv.key = readnum(special, &err);
553 if (err)
554 nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a"
555 " valid number", special);
556 else if ((sym->symv.key | (sym->symv.key - 1)) != 2 * sym->symv.key - 1)
557 nasm_error(ERR_NONFATAL, "alignment constraint `%s' is not a"
558 " power of two", special);
559 }
560 special_used = true;
561 } else
562 sym->symv.key = (sym->section == SHN_UNDEF ? 0 : offset);
563
564 if (sym->type == SYM_GLOBAL) {
565 /*
566 * If sym->section == SHN_ABS, then the first line of the
567 * else section would cause a core dump, because its a reference
568 * beyond the end of the section array.
569 * This behaviour is exhibited by this code:
570 * GLOBAL crash_nasm
571 * crash_nasm equ 0
572 * To avoid such a crash, such requests are silently discarded.
573 * This may not be the best solution.
574 */
575 if (sym->section == SHN_UNDEF || sym->section == SHN_COMMON) {
576 bsym = raa_write(bsym, segment, nglobs);
577 } else if (sym->section != SHN_ABS) {
578 /*
579 * This is a global symbol; so we must add it to the rbtree
580 * of global symbols in its section.
581 *
582 * In addition, we check the special text for symbol
583 * type and size information.
584 */
585 sects[sym->section-1]->gsyms =
586 rb_insert(sects[sym->section-1]->gsyms, &sym->symv);
587
588 if (special) {
589 int n = strcspn(special, " \t");
590
591 if (!nasm_strnicmp(special, "function", n))
592 sym->type |= STT_FUNC;
593 else if (!nasm_strnicmp(special, "data", n) ||
594 !nasm_strnicmp(special, "object", n))
595 sym->type |= STT_OBJECT;
596 else if (!nasm_strnicmp(special, "notype", n))
597 sym->type |= STT_NOTYPE;
598 else
599 nasm_error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
600 n, special);
601 special += n;
602
603 special = nasm_skip_spaces(special);
604 if (*special) {
605 n = strcspn(special, " \t");
606 if (!nasm_strnicmp(special, "default", n))
607 sym->other = STV_DEFAULT;
608 else if (!nasm_strnicmp(special, "internal", n))
609 sym->other = STV_INTERNAL;
610 else if (!nasm_strnicmp(special, "hidden", n))
611 sym->other = STV_HIDDEN;
612 else if (!nasm_strnicmp(special, "protected", n))
613 sym->other = STV_PROTECTED;
614 else
615 n = 0;
616 special += n;
617 }
618
619 if (*special) {
620 struct tokenval tokval;
621 expr *e;
622 int fwd = 0;
623 char *saveme = stdscan_get();
624
625 while (special[n] && nasm_isspace(special[n]))
626 n++;
627 /*
628 * We have a size expression; attempt to
629 * evaluate it.
630 */
631 stdscan_reset();
632 stdscan_set(special + n);
633 tokval.t_type = TOKEN_INVALID;
634 e = evaluate(stdscan, NULL, &tokval, &fwd, 0, nasm_error,
635 NULL);
636 if (fwd) {
637 sym->nextfwd = fwds;
638 fwds = sym;
639 sym->name = nasm_strdup(name);
640 } else if (e) {
641 if (!is_simple(e))
642 nasm_error(ERR_NONFATAL, "cannot use relocatable"
643 " expression as symbol size");
644 else
645 sym->size = reloc_value(e);
646 }
647 stdscan_set(saveme);
648 }
649 special_used = true;
650 }
651 /*
652 * If TLS segment, mark symbol accordingly.
653 */
654 if (sects[sym->section - 1]->flags & SHF_TLS) {
655 sym->type &= 0xf0;
656 sym->type |= STT_TLS;
657 }
658 }
659 sym->globnum = nglobs;
660 nglobs++;
661 } else
662 nlocals++;
663
664 if (special && !special_used)
665 nasm_error(ERR_NONFATAL, "no special symbol features supported here");
666 }
667
668 static void elf_add_reloc(struct Section *sect, int32_t segment, int type)
669 {
670 struct Reloc *r;
671
672 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
673 sect->tail = &r->next;
674 r->next = NULL;
675
676 r->address = sect->len;
677 if (segment == NO_SEG)
678 r->symbol = 0;
679 else {
680 int i;
681 r->symbol = 0;
682 for (i = 0; i < nsects; i++)
683 if (segment == sects[i]->index)
684 r->symbol = i + 2;
685 if (!r->symbol)
686 r->symbol = GLOBAL_TEMP_BASE + raa_read(bsym, segment);
687 }
688 r->type = type;
689
690 sect->nrelocs++;
691 }
692
693 /*
694 * This routine deals with ..got and ..sym relocations: the more
695 * complicated kinds. In shared-library writing, some relocations
696 * with respect to global symbols must refer to the precise symbol
697 * rather than referring to an offset from the base of the section
698 * _containing_ the symbol. Such relocations call to this routine,
699 * which searches the symbol list for the symbol in question.
700 *
701 * R_386_GOT32 references require the _exact_ symbol address to be
702 * used; R_386_32 references can be at an offset from the symbol.
703 * The boolean argument `exact' tells us this.
704 *
705 * Return value is the adjusted value of `addr', having become an
706 * offset from the symbol rather than the section. Should always be
707 * zero when returning from an exact call.
708 *
709 * Limitation: if you define two symbols at the same place,
710 * confusion will occur.
711 *
712 * Inefficiency: we search, currently, using a linked list which
713 * isn't even necessarily sorted.
714 */
715 static int32_t elf_add_gsym_reloc(struct Section *sect,
716 int32_t segment, uint32_t offset,
717 int type, bool exact)
718 {
719 struct Reloc *r;
720 struct Section *s;
721 struct Symbol *sym;
722 struct rbtree *srb;
723 int i;
724
725 /*
726 * First look up the segment/offset pair and find a global
727 * symbol corresponding to it. If it's not one of our segments,
728 * then it must be an external symbol, in which case we're fine
729 * doing a normal elf_add_reloc after first sanity-checking
730 * that the offset from the symbol is zero.
731 */
732 s = NULL;
733 for (i = 0; i < nsects; i++)
734 if (segment == sects[i]->index) {
735 s = sects[i];
736 break;
737 }
738 if (!s) {
739 if (exact && offset != 0)
740 nasm_error(ERR_NONFATAL, "unable to find a suitable global symbol"
741 " for this reference");
742 else
743 elf_add_reloc(sect, segment, type);
744 return offset;
745 }
746
747 srb = rb_search(s->gsyms, offset);
748 if (!srb || (exact && srb->key != offset)) {
749 nasm_error(ERR_NONFATAL, "unable to find a suitable global symbol"
750 " for this reference");
751 return 0;
752 }
753 sym = container_of(srb, struct Symbol, symv);
754
755 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
756 sect->tail = &r->next;
757 r->next = NULL;
758
759 r->address = sect->len;
760 r->symbol = GLOBAL_TEMP_BASE + sym->globnum;
761 r->type = type;
762
763 sect->nrelocs++;
764
765 return offset - sym->symv.key;
766 }
767
768 static void elf_out(int32_t segto, const void *data,
769 enum out_type type, uint64_t size,
770 int32_t segment, int32_t wrt)
771 {
772 struct Section *s;
773 int32_t addr;
774 uint8_t mydata[4], *p;
775 int i;
776 static struct symlininfo sinfo;
777
778 /*
779 * handle absolute-assembly (structure definitions)
780 */
781 if (segto == NO_SEG) {
782 if (type != OUT_RESERVE)
783 nasm_error(ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
784 " space");
785 return;
786 }
787
788 s = NULL;
789 for (i = 0; i < nsects; i++)
790 if (segto == sects[i]->index) {
791 s = sects[i];
792 break;
793 }
794 if (!s) {
795 int tempint; /* ignored */
796 if (segto != elf_section_names(".text", 2, &tempint))
797 nasm_error(ERR_PANIC, "strange segment conditions in ELF driver");
798 else {
799 s = sects[nsects - 1];
800 i = nsects - 1;
801 }
802 }
803
804 /* again some stabs debugging stuff */
805 if (of_elf32.current_dfmt) {
806 sinfo.offset = s->len;
807 sinfo.section = i;
808 sinfo.name = s->name;
809 of_elf32.current_dfmt->debug_output(TY_STABSSYMLIN, &sinfo);
810 }
811 /* end of debugging stuff */
812
813 if (s->type == SHT_NOBITS && type != OUT_RESERVE) {
814 nasm_error(ERR_WARNING, "attempt to initialize memory in"
815 " BSS section `%s': ignored", s->name);
816 s->len += realsize(type, size);
817 return;
818 }
819
820 if (type == OUT_RESERVE) {
821 if (s->type == SHT_PROGBITS) {
822 nasm_error(ERR_WARNING, "uninitialized space declared in"
823 " non-BSS section `%s': zeroing", s->name);
824 elf_sect_write(s, NULL, size);
825 } else
826 s->len += size;
827 } else if (type == OUT_RAWDATA) {
828 if (segment != NO_SEG)
829 nasm_error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
830 elf_sect_write(s, data, size);
831 } else if (type == OUT_ADDRESS) {
832 bool gnu16 = false;
833 addr = *(int64_t *)data;
834 if (segment != NO_SEG) {
835 if (segment % 2) {
836 nasm_error(ERR_NONFATAL, "ELF format does not support"
837 " segment base references");
838 } else {
839 if (wrt == NO_SEG) {
840 if (size == 2) {
841 gnu16 = true;
842 elf_add_reloc(s, segment, R_386_16);
843 } else {
844 elf_add_reloc(s, segment, R_386_32);
845 }
846 } else if (wrt == elf_gotpc_sect + 1) {
847 /*
848 * The user will supply GOT relative to $$. ELF
849 * will let us have GOT relative to $. So we
850 * need to fix up the data item by $-$$.
851 */
852 addr += s->len;
853 elf_add_reloc(s, segment, R_386_GOTPC);
854 } else if (wrt == elf_gotoff_sect + 1) {
855 elf_add_reloc(s, segment, R_386_GOTOFF);
856 } else if (wrt == elf_tlsie_sect + 1) {
857 addr = elf_add_gsym_reloc(s, segment, addr,
858 R_386_TLS_IE, true);
859 } else if (wrt == elf_got_sect + 1) {
860 addr = elf_add_gsym_reloc(s, segment, addr,
861 R_386_GOT32, true);
862 } else if (wrt == elf_sym_sect + 1) {
863 if (size == 2) {
864 gnu16 = true;
865 addr = elf_add_gsym_reloc(s, segment, addr,
866 R_386_16, false);
867 } else {
868 addr = elf_add_gsym_reloc(s, segment, addr,
869 R_386_32, false);
870 }
871 } else if (wrt == elf_plt_sect + 1) {
872 nasm_error(ERR_NONFATAL, "ELF format cannot produce non-PC-"
873 "relative PLT references");
874 } else {
875 nasm_error(ERR_NONFATAL, "ELF format does not support this"
876 " use of WRT");
877 wrt = NO_SEG; /* we can at least _try_ to continue */
878 }
879 }
880 }
881 p = mydata;
882 if (gnu16) {
883 nasm_error(ERR_WARNING | ERR_WARN_GNUELF,
884 "16-bit relocations in ELF is a GNU extension");
885 WRITESHORT(p, addr);
886 } else {
887 if (size != 4 && segment != NO_SEG) {
888 nasm_error(ERR_NONFATAL,
889 "Unsupported non-32-bit ELF relocation");
890 }
891 WRITELONG(p, addr);
892 }
893 elf_sect_write(s, mydata, size);
894 } else if (type == OUT_REL2ADR) {
895 if (segment == segto)
896 nasm_error(ERR_PANIC, "intra-segment OUT_REL2ADR");
897 if (segment != NO_SEG && segment % 2) {
898 nasm_error(ERR_NONFATAL, "ELF format does not support"
899 " segment base references");
900 } else {
901 if (wrt == NO_SEG) {
902 nasm_error(ERR_WARNING | ERR_WARN_GNUELF,
903 "16-bit relocations in ELF is a GNU extension");
904 elf_add_reloc(s, segment, R_386_PC16);
905 } else {
906 nasm_error(ERR_NONFATAL,
907 "Unsupported non-32-bit ELF relocation");
908 }
909 }
910 p = mydata;
911 WRITESHORT(p, *(int64_t *)data - size);
912 elf_sect_write(s, mydata, 2L);
913 } else if (type == OUT_REL4ADR) {
914 if (segment == segto)
915 nasm_error(ERR_PANIC, "intra-segment OUT_REL4ADR");
916 if (segment != NO_SEG && segment % 2) {
917 nasm_error(ERR_NONFATAL, "ELF format does not support"
918 " segment base references");
919 } else {
920 if (wrt == NO_SEG) {
921 elf_add_reloc(s, segment, R_386_PC32);
922 } else if (wrt == elf_plt_sect + 1) {
923 elf_add_reloc(s, segment, R_386_PLT32);
924 } else if (wrt == elf_gotpc_sect + 1 ||
925 wrt == elf_gotoff_sect + 1 ||
926 wrt == elf_got_sect + 1) {
927 nasm_error(ERR_NONFATAL, "ELF format cannot produce PC-"
928 "relative GOT references");
929 } else {
930 nasm_error(ERR_NONFATAL, "ELF format does not support this"
931 " use of WRT");
932 wrt = NO_SEG; /* we can at least _try_ to continue */
933 }
934 }
935 p = mydata;
936 WRITELONG(p, *(int64_t *)data - size);
937 elf_sect_write(s, mydata, 4L);
938 }
939 }
940
941 static void elf_write(void)
942 {
943 int align;
944 char *p;
945 int i;
946
947 struct SAA *symtab;
948 int32_t symtablen, symtablocal;
949
950 /*
951 * Work out how many sections we will have. We have SHN_UNDEF,
952 * then the flexible user sections, then the fixed sections
953 * `.shstrtab', `.symtab' and `.strtab', then optionally
954 * relocation sections for the user sections.
955 */
956 nsections = sec_numspecial + 1;
957 if (of_elf32.current_dfmt == &df_stabs)
958 nsections += 3;
959 else if (of_elf32.current_dfmt == &df_dwarf)
960 nsections += 10;
961
962 add_sectname("", ".shstrtab");
963 add_sectname("", ".symtab");
964 add_sectname("", ".strtab");
965 for (i = 0; i < nsects; i++) {
966 nsections++; /* for the section itself */
967 if (sects[i]->head) {
968 nsections++; /* for its relocations */
969 add_sectname(".rel", sects[i]->name);
970 }
971 }
972
973 if (of_elf32.current_dfmt == &df_stabs) {
974 /* in case the debug information is wanted, just add these three sections... */
975 add_sectname("", ".stab");
976 add_sectname("", ".stabstr");
977 add_sectname(".rel", ".stab");
978 } else if (of_elf32.current_dfmt == &df_dwarf) {
979 /* the dwarf debug standard specifies the following ten sections,
980 not all of which are currently implemented,
981 although all of them are defined. */
982 add_sectname("", ".debug_aranges");
983 add_sectname(".rela", ".debug_aranges");
984 add_sectname("", ".debug_pubnames");
985 add_sectname("", ".debug_info");
986 add_sectname(".rela", ".debug_info");
987 add_sectname("", ".debug_abbrev");
988 add_sectname("", ".debug_line");
989 add_sectname(".rela", ".debug_line");
990 add_sectname("", ".debug_frame");
991 add_sectname("", ".debug_loc");
992 }
993
994 /*
995 * Output the ELF header.
996 */
997 fwrite("\177ELF\1\1\1", 7, 1, ofile);
998 fputc(elf_osabi, ofile);
999 fputc(elf_abiver, ofile);
1000 fwritezero(7, ofile);
1001 fwriteint16_t(1, ofile); /* ET_REL relocatable file */
1002 fwriteint16_t(3, ofile); /* EM_386 processor ID */
1003 fwriteint32_t(1L, ofile); /* EV_CURRENT file format version */
1004 fwriteint32_t(0L, ofile); /* no entry point */
1005 fwriteint32_t(0L, ofile); /* no program header table */
1006 fwriteint32_t(0x40L, ofile); /* section headers straight after
1007 * ELF header plus alignment */
1008 fwriteint32_t(0L, ofile); /* 386 defines no special flags */
1009 fwriteint16_t(0x34, ofile); /* size of ELF header */
1010 fwriteint16_t(0, ofile); /* no program header table, again */
1011 fwriteint16_t(0, ofile); /* still no program header table */
1012 fwriteint16_t(0x28, ofile); /* size of section header */
1013 fwriteint16_t(nsections, ofile); /* number of sections */
1014 fwriteint16_t(sec_shstrtab, ofile); /* string table section index for
1015 * section header table */
1016 fwriteint32_t(0L, ofile); /* align to 0x40 bytes */
1017 fwriteint32_t(0L, ofile);
1018 fwriteint32_t(0L, ofile);
1019
1020 /*
1021 * Build the symbol table and relocation tables.
1022 */
1023 symtab = elf_build_symtab(&symtablen, &symtablocal);
1024 for (i = 0; i < nsects; i++)
1025 if (sects[i]->head)
1026 sects[i]->rel = elf_build_reltab(&sects[i]->rellen,
1027 sects[i]->head);
1028
1029 /*
1030 * Now output the section header table.
1031 */
1032
1033 elf_foffs = 0x40 + 0x28 * nsections;
1034 align = ((elf_foffs + SEG_ALIGN_1) & ~SEG_ALIGN_1) - elf_foffs;
1035 elf_foffs += align;
1036 elf_nsect = 0;
1037 elf_sects = nasm_malloc(sizeof(*elf_sects) * nsections);
1038
1039 /* SHN_UNDEF */
1040 elf_section_header(0, SHT_NULL, 0, NULL, false, 0, SHN_UNDEF, 0, 0, 0);
1041 p = shstrtab + 1;
1042
1043 /* The normal sections */
1044 for (i = 0; i < nsects; i++) {
1045 elf_section_header(p - shstrtab, sects[i]->type, sects[i]->flags,
1046 (sects[i]->type == SHT_PROGBITS ?
1047 sects[i]->data : NULL), true,
1048 sects[i]->len, 0, 0, sects[i]->align, 0);
1049 p += strlen(p) + 1;
1050 }
1051
1052 /* .shstrtab */
1053 elf_section_header(p - shstrtab, SHT_STRTAB, 0, shstrtab, false,
1054 shstrtablen, 0, 0, 1, 0);
1055 p += strlen(p) + 1;
1056
1057 /* .symtab */
1058 elf_section_header(p - shstrtab, SHT_SYMTAB, 0, symtab, true,
1059 symtablen, sec_strtab, symtablocal, 4, 16);
1060 p += strlen(p) + 1;
1061
1062 /* .strtab */
1063 elf_section_header(p - shstrtab, SHT_STRTAB, 0, strs, true,
1064 strslen, 0, 0, 1, 0);
1065 p += strlen(p) + 1;
1066
1067 /* The relocation sections */
1068 for (i = 0; i < nsects; i++)
1069 if (sects[i]->head) {
1070 elf_section_header(p - shstrtab, SHT_REL, 0, sects[i]->rel, true,
1071 sects[i]->rellen, sec_symtab, i + 1, 4, 8);
1072 p += strlen(p) + 1;
1073 }
1074
1075 if (of_elf32.current_dfmt == &df_stabs) {
1076 /* for debugging information, create the last three sections
1077 which are the .stab , .stabstr and .rel.stab sections respectively */
1078
1079 /* this function call creates the stab sections in memory */
1080 stabs32_generate();
1081
1082 if (stabbuf && stabstrbuf && stabrelbuf) {
1083 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, stabbuf, false,
1084 stablen, sec_stabstr, 0, 4, 12);
1085 p += strlen(p) + 1;
1086
1087 elf_section_header(p - shstrtab, SHT_STRTAB, 0, stabstrbuf, false,
1088 stabstrlen, 0, 0, 4, 0);
1089 p += strlen(p) + 1;
1090
1091 /* link -> symtable info -> section to refer to */
1092 elf_section_header(p - shstrtab, SHT_REL, 0, stabrelbuf, false,
1093 stabrellen, sec_symtab, sec_stab, 4, 8);
1094 p += strlen(p) + 1;
1095 }
1096 } else if (of_elf32.current_dfmt == &df_dwarf) {
1097 /* for dwarf debugging information, create the ten dwarf sections */
1098
1099 /* this function call creates the dwarf sections in memory */
1100 if (dwarf_fsect)
1101 dwarf32_generate();
1102
1103 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, arangesbuf, false,
1104 arangeslen, 0, 0, 1, 0);
1105 p += strlen(p) + 1;
1106
1107 elf_section_header(p - shstrtab, SHT_RELA, 0, arangesrelbuf, false,
1108 arangesrellen, sec_symtab, sec_debug_aranges,
1109 1, 12);
1110 p += strlen(p) + 1;
1111
1112 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, pubnamesbuf,
1113 false, pubnameslen, 0, 0, 1, 0);
1114 p += strlen(p) + 1;
1115
1116 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, infobuf, false,
1117 infolen, 0, 0, 1, 0);
1118 p += strlen(p) + 1;
1119
1120 elf_section_header(p - shstrtab, SHT_RELA, 0, inforelbuf, false,
1121 inforellen, sec_symtab, sec_debug_info, 1, 12);
1122 p += strlen(p) + 1;
1123
1124 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, abbrevbuf, false,
1125 abbrevlen, 0, 0, 1, 0);
1126 p += strlen(p) + 1;
1127
1128 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, linebuf, false,
1129 linelen, 0, 0, 1, 0);
1130 p += strlen(p) + 1;
1131
1132 elf_section_header(p - shstrtab, SHT_RELA, 0, linerelbuf, false,
1133 linerellen, sec_symtab, sec_debug_line, 1, 12);
1134 p += strlen(p) + 1;
1135
1136 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, framebuf, false,
1137 framelen, 0, 0, 8, 0);
1138 p += strlen(p) + 1;
1139
1140 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, locbuf, false,
1141 loclen, 0, 0, 1, 0);
1142 p += strlen(p) + 1;
1143 }
1144 fwritezero(align, ofile);
1145
1146 /*
1147 * Now output the sections.
1148 */
1149 elf_write_sections();
1150
1151 nasm_free(elf_sects);
1152 saa_free(symtab);
1153 }
1154
1155 static struct SAA *elf_build_symtab(int32_t *len, int32_t *local)
1156 {
1157 struct SAA *s = saa_init(1L);
1158 struct Symbol *sym;
1159 uint8_t entry[16], *p;
1160 int i;
1161
1162 *len = *local = 0;
1163
1164 /*
1165 * First, an all-zeros entry, required by the ELF spec.
1166 */
1167 saa_wbytes(s, NULL, 16L); /* null symbol table entry */
1168 *len += 16;
1169 (*local)++;
1170
1171 /*
1172 * Next, an entry for the file name.
1173 */
1174 p = entry;
1175 WRITELONG(p, 1); /* we know it's 1st entry in strtab */
1176 WRITELONG(p, 0); /* no value */
1177 WRITELONG(p, 0); /* no size either */
1178 WRITESHORT(p, STT_FILE); /* type FILE */
1179 WRITESHORT(p, SHN_ABS);
1180 saa_wbytes(s, entry, 16L);
1181 *len += 16;
1182 (*local)++;
1183
1184 /*
1185 * Now some standard symbols defining the segments, for relocation
1186 * purposes.
1187 */
1188 for (i = 1; i <= nsects; i++) {
1189 p = entry;
1190 WRITELONG(p, 0); /* no symbol name */
1191 WRITELONG(p, 0); /* offset zero */
1192 WRITELONG(p, 0); /* size zero */
1193 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1194 WRITESHORT(p, i); /* section id */
1195 saa_wbytes(s, entry, 16L);
1196 *len += 16;
1197 (*local)++;
1198 }
1199
1200 /*
1201 * Now the other local symbols.
1202 */
1203 saa_rewind(syms);
1204 while ((sym = saa_rstruct(syms))) {
1205 if (sym->type & SYM_GLOBAL)
1206 continue;
1207 p = entry;
1208 WRITELONG(p, sym->strpos);
1209 WRITELONG(p, sym->symv.key);
1210 WRITELONG(p, sym->size);
1211 WRITECHAR(p, sym->type); /* type and binding */
1212 WRITECHAR(p, sym->other); /* visibility */
1213 WRITESHORT(p, sym->section);
1214 saa_wbytes(s, entry, 16L);
1215 *len += 16;
1216 (*local)++;
1217 }
1218 /*
1219 * dwarf needs symbols for debug sections
1220 * which are relocation targets.
1221 */
1222 //*** fix for 32 bit
1223 if (of_elf32.current_dfmt == &df_dwarf) {
1224 dwarf_infosym = *local;
1225 p = entry;
1226 WRITELONG(p, 0); /* no symbol name */
1227 WRITELONG(p, (uint32_t) 0); /* offset zero */
1228 WRITELONG(p, (uint32_t) 0); /* size zero */
1229 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1230 WRITESHORT(p, sec_debug_info); /* section id */
1231 saa_wbytes(s, entry, 16L);
1232 *len += 16;
1233 (*local)++;
1234 dwarf_abbrevsym = *local;
1235 p = entry;
1236 WRITELONG(p, 0); /* no symbol name */
1237 WRITELONG(p, (uint32_t) 0); /* offset zero */
1238 WRITELONG(p, (uint32_t) 0); /* size zero */
1239 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1240 WRITESHORT(p, sec_debug_abbrev); /* section id */
1241 saa_wbytes(s, entry, 16L);
1242 *len += 16;
1243 (*local)++;
1244 dwarf_linesym = *local;
1245 p = entry;
1246 WRITELONG(p, 0); /* no symbol name */
1247 WRITELONG(p, (uint32_t) 0); /* offset zero */
1248 WRITELONG(p, (uint32_t) 0); /* size zero */
1249 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1250 WRITESHORT(p, sec_debug_line); /* section id */
1251 saa_wbytes(s, entry, 16L);
1252 *len += 16;
1253 (*local)++;
1254 }
1255
1256 /*
1257 * Now the global symbols.
1258 */
1259 saa_rewind(syms);
1260 while ((sym = saa_rstruct(syms))) {
1261 if (!(sym->type & SYM_GLOBAL))
1262 continue;
1263 p = entry;
1264 WRITELONG(p, sym->strpos);
1265 WRITELONG(p, sym->symv.key);
1266 WRITELONG(p, sym->size);
1267 WRITECHAR(p, sym->type); /* type and binding */
1268 WRITECHAR(p, sym->other); /* visibility */
1269 WRITESHORT(p, sym->section);
1270 saa_wbytes(s, entry, 16L);
1271 *len += 16;
1272 }
1273
1274 return s;
1275 }
1276
1277 static struct SAA *elf_build_reltab(int32_t *len, struct Reloc *r)
1278 {
1279 struct SAA *s;
1280 uint8_t *p, entry[8];
1281 int32_t global_offset;
1282
1283 if (!r)
1284 return NULL;
1285
1286 s = saa_init(1L);
1287 *len = 0;
1288
1289 /*
1290 * How to onvert from a global placeholder to a real symbol index;
1291 * the +2 refers to the two special entries, the null entry and
1292 * the filename entry.
1293 */
1294 global_offset = -GLOBAL_TEMP_BASE + nsects + nlocals + ndebugs + 2;
1295
1296 while (r) {
1297 int32_t sym = r->symbol;
1298
1299 /*
1300 * Create a real symbol index; the +2 refers to the two special
1301 * entries, the null entry and the filename entry.
1302 */
1303 if (sym >= GLOBAL_TEMP_BASE)
1304 sym += global_offset;
1305
1306 p = entry;
1307 WRITELONG(p, r->address);
1308 WRITELONG(p, (sym << 8) + r->type);
1309 saa_wbytes(s, entry, 8L);
1310 *len += 8;
1311
1312 r = r->next;
1313 }
1314
1315 return s;
1316 }
1317
1318 static void elf_section_header(int name, int type, int flags,
1319 void *data, bool is_saa, int32_t datalen,
1320 int link, int info, int align, int eltsize)
1321 {
1322 elf_sects[elf_nsect].data = data;
1323 elf_sects[elf_nsect].len = datalen;
1324 elf_sects[elf_nsect].is_saa = is_saa;
1325 elf_nsect++;
1326
1327 fwriteint32_t((int32_t)name, ofile);
1328 fwriteint32_t((int32_t)type, ofile);
1329 fwriteint32_t((int32_t)flags, ofile);
1330 fwriteint32_t(0L, ofile); /* no address, ever, in object files */
1331 fwriteint32_t(type == 0 ? 0L : elf_foffs, ofile);
1332 fwriteint32_t(datalen, ofile);
1333 if (data)
1334 elf_foffs += (datalen + SEG_ALIGN_1) & ~SEG_ALIGN_1;
1335 fwriteint32_t((int32_t)link, ofile);
1336 fwriteint32_t((int32_t)info, ofile);
1337 fwriteint32_t((int32_t)align, ofile);
1338 fwriteint32_t((int32_t)eltsize, ofile);
1339 }
1340
1341 static void elf_write_sections(void)
1342 {
1343 int i;
1344 for (i = 0; i < elf_nsect; i++)
1345 if (elf_sects[i].data) {
1346 int32_t len = elf_sects[i].len;
1347 int32_t reallen = (len + SEG_ALIGN_1) & ~SEG_ALIGN_1;
1348 int32_t align = reallen - len;
1349 if (elf_sects[i].is_saa)
1350 saa_fpwrite(elf_sects[i].data, ofile);
1351 else
1352 fwrite(elf_sects[i].data, len, 1, ofile);
1353 fwritezero(align, ofile);
1354 }
1355 }
1356
1357 static void elf_sect_write(struct Section *sect,
1358 const uint8_t *data, uint32_t len)
1359 {
1360 saa_wbytes(sect->data, data, len);
1361 sect->len += len;
1362 }
1363
1364 static int32_t elf_segbase(int32_t segment)
1365 {
1366 return segment;
1367 }
1368
1369 static int elf_directive(enum directives directive, char *value, int pass)
1370 {
1371 bool err;
1372 int64_t n;
1373 char *p;
1374
1375 switch (directive) {
1376 case D_OSABI:
1377 if (pass == 2)
1378 return 1; /* ignore in pass 2 */
1379
1380 n = readnum(value, &err);
1381 if (err) {
1382 nasm_error(ERR_NONFATAL, "`osabi' directive requires a parameter");
1383 return 1;
1384 }
1385 if (n < 0 || n > 255) {
1386 nasm_error(ERR_NONFATAL, "valid osabi numbers are 0 to 255");
1387 return 1;
1388 }
1389 elf_osabi = n;
1390 elf_abiver = 0;
1391
1392 if ((p = strchr(value,',')) == NULL)
1393 return 1;
1394
1395 n = readnum(p+1, &err);
1396 if (err || n < 0 || n > 255) {
1397 nasm_error(ERR_NONFATAL, "invalid ABI version number (valid: 0 to 255)");
1398 return 1;
1399 }
1400
1401 elf_abiver = n;
1402 return 1;
1403
1404 default:
1405 return 0;
1406 }
1407 }
1408
1409 static void elf_filename(char *inname, char *outname)
1410 {
1411 strcpy(elf_module, inname);
1412 standard_extension(inname, outname, ".o");
1413 }
1414
1415 extern macros_t elf_stdmac[];
1416
1417 static int elf_set_info(enum geninfo type, char **val)
1418 {
1419 (void)type;
1420 (void)val;
1421 return 0;
1422 }
1423 static struct dfmt df_dwarf = {
1424 "ELF32 (i386) dwarf debug format for Linux/Unix",
1425 "dwarf",
1426 dwarf32_init,
1427 dwarf32_linenum,
1428 debug32_deflabel,
1429 debug32_directive,
1430 debug32_typevalue,
1431 dwarf32_output,
1432 dwarf32_cleanup
1433 };
1434 static struct dfmt df_stabs = {
1435 "ELF32 (i386) stabs debug format for Linux/Unix",
1436 "stabs",
1437 null_debug_init,
1438 stabs32_linenum,
1439 debug32_deflabel,
1440 debug32_directive,
1441 debug32_typevalue,
1442 stabs32_output,
1443 stabs32_cleanup
1444 };
1445
1446 struct dfmt *elf32_debugs_arr[3] = { &df_dwarf, &df_stabs, NULL };
1447
1448 struct ofmt of_elf32 = {
1449 "ELF32 (i386) object files (e.g. Linux)",
1450 "elf32",
1451 0,
1452 elf32_debugs_arr,
1453 &df_stabs,
1454 elf_stdmac,
1455 elf_init,
1456 elf_set_info,
1457 elf_out,
1458 elf_deflabel,
1459 elf_section_names,
1460 elf_segbase,
1461 elf_directive,
1462 elf_filename,
1463 elf_cleanup
1464 };
1465
1466 struct ofmt of_elf = {
1467 "ELF (short name for ELF32) ",
1468 "elf",
1469 0,
1470 elf32_debugs_arr,
1471 &df_stabs,
1472 elf_stdmac,
1473 elf_init_hack,
1474 elf_set_info,
1475 elf_out,
1476 elf_deflabel,
1477 elf_section_names,
1478 elf_segbase,
1479 elf_directive,
1480 elf_filename,
1481 elf_cleanup
1482 };
1483 /* again, the stabs debugging stuff (code) */
1484
1485 static void stabs32_linenum(const char *filename, int32_t linenumber,
1486 int32_t segto)
1487 {
1488 (void)segto;
1489
1490 if (!stabs_filename) {
1491 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1492 strcpy(stabs_filename, filename);
1493 } else {
1494 if (strcmp(stabs_filename, filename)) {
1495 /*
1496 * yep, a memory leak...this program is one-shot anyway, so who cares...
1497 * in fact, this leak comes in quite handy to maintain a list of files
1498 * encountered so far in the symbol lines...
1499 */
1500
1501 /* why not nasm_free(stabs_filename); we're done with the old one */
1502
1503 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1504 strcpy(stabs_filename, filename);
1505 }
1506 }
1507 debug_immcall = 1;
1508 currentline = linenumber;
1509 }
1510
1511 static void debug32_deflabel(char *name, int32_t segment, int64_t offset, int is_global,
1512 char *special)
1513 {
1514 (void)name;
1515 (void)segment;
1516 (void)offset;
1517 (void)is_global;
1518 (void)special;
1519 }
1520
1521 static void debug32_directive(const char *directive, const char *params)
1522 {
1523 (void)directive;
1524 (void)params;
1525 }
1526
1527 static void debug32_typevalue(int32_t type)
1528 {
1529 int32_t stype, ssize;
1530 switch (TYM_TYPE(type)) {
1531 case TY_LABEL:
1532 ssize = 0;
1533 stype = STT_NOTYPE;
1534 break;
1535 case TY_BYTE:
1536 ssize = 1;
1537 stype = STT_OBJECT;
1538 break;
1539 case TY_WORD:
1540 ssize = 2;
1541 stype = STT_OBJECT;
1542 break;
1543 case TY_DWORD:
1544 ssize = 4;
1545 stype = STT_OBJECT;
1546 break;
1547 case TY_FLOAT:
1548 ssize = 4;
1549 stype = STT_OBJECT;
1550 break;
1551 case TY_QWORD:
1552 ssize = 8;
1553 stype = STT_OBJECT;
1554 break;
1555 case TY_TBYTE:
1556 ssize = 10;
1557 stype = STT_OBJECT;
1558 break;
1559 case TY_OWORD:
1560 ssize = 16;
1561 stype = STT_OBJECT;
1562 break;
1563 case TY_YWORD:
1564 ssize = 32;
1565 stype = STT_OBJECT;
1566 break;
1567 case TY_COMMON:
1568 ssize = 0;
1569 stype = STT_COMMON;
1570 break;
1571 case TY_SEG:
1572 ssize = 0;
1573 stype = STT_SECTION;
1574 break;
1575 case TY_EXTERN:
1576 ssize = 0;
1577 stype = STT_NOTYPE;
1578 break;
1579 case TY_EQU:
1580 ssize = 0;
1581 stype = STT_NOTYPE;
1582 break;
1583 default:
1584 ssize = 0;
1585 stype = STT_NOTYPE;
1586 break;
1587 }
1588 if (stype == STT_OBJECT && lastsym && !lastsym->type) {
1589 lastsym->size = ssize;
1590 lastsym->type = stype;
1591 }
1592 }
1593
1594 static void stabs32_output(int type, void *param)
1595 {
1596 struct symlininfo *s;
1597 struct linelist *el;
1598 if (type == TY_STABSSYMLIN) {
1599 if (debug_immcall) {
1600 s = (struct symlininfo *)param;
1601 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1602 return; /* we are only interested in the text stuff */
1603 numlinestabs++;
1604 el = (struct linelist *)nasm_malloc(sizeof(struct linelist));
1605 el->info.offset = s->offset;
1606 el->info.section = s->section;
1607 el->info.name = s->name;
1608 el->line = currentline;
1609 el->filename = stabs_filename;
1610 el->next = 0;
1611 if (stabslines) {
1612 stabslines->last->next = el;
1613 stabslines->last = el;
1614 } else {
1615 stabslines = el;
1616 stabslines->last = el;
1617 }
1618 }
1619 }
1620 debug_immcall = 0;
1621 }
1622
1623 #define WRITE_STAB(p,n_strx,n_type,n_other,n_desc,n_value) \
1624 do { \
1625 WRITELONG(p,n_strx); \
1626 WRITECHAR(p,n_type); \
1627 WRITECHAR(p,n_other); \
1628 WRITESHORT(p,n_desc); \
1629 WRITELONG(p,n_value); \
1630 } while (0)
1631
1632 /* for creating the .stab , .stabstr and .rel.stab sections in memory */
1633
1634 static void stabs32_generate(void)
1635 {
1636 int i, numfiles, strsize, numstabs = 0, currfile, mainfileindex;
1637 uint8_t *sbuf, *ssbuf, *rbuf, *sptr, *rptr;
1638 char **allfiles;
1639 int *fileidx;
1640
1641 struct linelist *ptr;
1642
1643 ptr = stabslines;
1644
1645 allfiles = (char **)nasm_malloc(numlinestabs * sizeof(char *));
1646 for (i = 0; i < numlinestabs; i++)
1647 allfiles[i] = 0;
1648 numfiles = 0;
1649 while (ptr) {
1650 if (numfiles == 0) {
1651 allfiles[0] = ptr->filename;
1652 numfiles++;
1653 } else {
1654 for (i = 0; i < numfiles; i++) {
1655 if (!strcmp(allfiles[i], ptr->filename))
1656 break;
1657 }
1658 if (i >= numfiles) {
1659 allfiles[i] = ptr->filename;
1660 numfiles++;
1661 }
1662 }
1663 ptr = ptr->next;
1664 }
1665 strsize = 1;
1666 fileidx = (int *)nasm_malloc(numfiles * sizeof(int));
1667 for (i = 0; i < numfiles; i++) {
1668 fileidx[i] = strsize;
1669 strsize += strlen(allfiles[i]) + 1;
1670 }
1671 mainfileindex = 0;
1672 for (i = 0; i < numfiles; i++) {
1673 if (!strcmp(allfiles[i], elf_module)) {
1674 mainfileindex = i;
1675 break;
1676 }
1677 }
1678
1679 /*
1680 * worst case size of the stab buffer would be:
1681 * the sourcefiles changes each line, which would mean 1 SOL, 1 SYMLIN per line
1682 * plus one "ending" entry
1683 */
1684 sbuf = (uint8_t *)nasm_malloc((numlinestabs * 2 + 4) *
1685 sizeof(struct stabentry));
1686 ssbuf = (uint8_t *)nasm_malloc(strsize);
1687 rbuf = (uint8_t *)nasm_malloc(numlinestabs * 8 * (2 + 3));
1688 rptr = rbuf;
1689
1690 for (i = 0; i < numfiles; i++)
1691 strcpy((char *)ssbuf + fileidx[i], allfiles[i]);
1692 ssbuf[0] = 0;
1693
1694 stabstrlen = strsize; /* set global variable for length of stab strings */
1695
1696 sptr = sbuf;
1697 ptr = stabslines;
1698 numstabs = 0;
1699
1700 if (ptr) {
1701 /*
1702 * this is the first stab, its strx points to the filename of the
1703 * the source-file, the n_desc field should be set to the number
1704 * of remaining stabs
1705 */
1706 WRITE_STAB(sptr, fileidx[0], 0, 0, 0, strlen(allfiles[0] + 12));
1707
1708 /* this is the stab for the main source file */
1709 WRITE_STAB(sptr, fileidx[mainfileindex], N_SO, 0, 0, 0);
1710
1711 /* relocation table entry */
1712
1713 /*
1714 * Since the symbol table has two entries before
1715 * the section symbols, the index in the info.section
1716 * member must be adjusted by adding 2
1717 */
1718
1719 WRITELONG(rptr, (sptr - sbuf) - 4);
1720 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1721
1722 numstabs++;
1723 currfile = mainfileindex;
1724 }
1725
1726 while (ptr) {
1727 if (strcmp(allfiles[currfile], ptr->filename)) {
1728 /* oops file has changed... */
1729 for (i = 0; i < numfiles; i++)
1730 if (!strcmp(allfiles[i], ptr->filename))
1731 break;
1732 currfile = i;
1733 WRITE_STAB(sptr, fileidx[currfile], N_SOL, 0, 0,
1734 ptr->info.offset);
1735 numstabs++;
1736
1737 /* relocation table entry */
1738 WRITELONG(rptr, (sptr - sbuf) - 4);
1739 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1740 }
1741
1742 WRITE_STAB(sptr, 0, N_SLINE, 0, ptr->line, ptr->info.offset);
1743 numstabs++;
1744
1745 /* relocation table entry */
1746
1747 WRITELONG(rptr, (sptr - sbuf) - 4);
1748 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1749
1750 ptr = ptr->next;
1751
1752 }
1753
1754 /* this is an "ending" token */
1755 WRITE_STAB(sptr, 0, N_SO, 0, 0, 0);
1756 numstabs++;
1757
1758 ((struct stabentry *)sbuf)->n_desc = numstabs;
1759
1760 nasm_free(allfiles);
1761 nasm_free(fileidx);
1762
1763 stablen = (sptr - sbuf);
1764 stabrellen = (rptr - rbuf);
1765 stabrelbuf = rbuf;
1766 stabbuf = sbuf;
1767 stabstrbuf = ssbuf;
1768 }
1769
1770 static void stabs32_cleanup(void)
1771 {
1772 struct linelist *ptr, *del;
1773 if (!stabslines)
1774 return;
1775
1776 ptr = stabslines;
1777 while (ptr) {
1778 del = ptr;
1779 ptr = ptr->next;
1780 nasm_free(del);
1781 }
1782
1783 nasm_free(stabbuf);
1784 nasm_free(stabrelbuf);
1785 nasm_free(stabstrbuf);
1786 }
1787
1788 /* dwarf routines */
1789
1790 static void dwarf32_init(void)
1791 {
1792 ndebugs = 3; /* 3 debug symbols */
1793 }
1794
1795 static void dwarf32_linenum(const char *filename, int32_t linenumber,
1796 int32_t segto)
1797 {
1798 (void)segto;
1799 dwarf32_findfile(filename);
1800 debug_immcall = 1;
1801 currentline = linenumber;
1802 }
1803
1804 /* called from elf_out with type == TY_DEBUGSYMLIN */
1805 static void dwarf32_output(int type, void *param)
1806 {
1807 int ln, aa, inx, maxln, soc;
1808 struct symlininfo *s;
1809 struct SAA *plinep;
1810
1811 (void)type;
1812
1813 s = (struct symlininfo *)param;
1814
1815 /* line number info is only gathered for executable sections */
1816 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1817 return;
1818
1819 /* Check if section index has changed */
1820 if (!(dwarf_csect && (dwarf_csect->section) == (s->section)))
1821 dwarf32_findsect(s->section);
1822
1823 /* do nothing unless line or file has changed */
1824 if (!debug_immcall)
1825 return;
1826
1827 ln = currentline - dwarf_csect->line;
1828 aa = s->offset - dwarf_csect->offset;
1829 inx = dwarf_clist->line;
1830 plinep = dwarf_csect->psaa;
1831 /* check for file change */
1832 if (!(inx == dwarf_csect->file)) {
1833 saa_write8(plinep,DW_LNS_set_file);
1834 saa_write8(plinep,inx);
1835 dwarf_csect->file = inx;
1836 }
1837 /* check for line change */
1838 if (ln) {
1839 /* test if in range of special op code */
1840 maxln = line_base + line_range;
1841 soc = (ln - line_base) + (line_range * aa) + opcode_base;
1842 if (ln >= line_base && ln < maxln && soc < 256) {
1843 saa_write8(plinep,soc);
1844 } else {
1845 saa_write8(plinep,DW_LNS_advance_line);
1846 saa_wleb128s(plinep,ln);
1847 if (aa) {
1848 saa_write8(plinep,DW_LNS_advance_pc);
1849 saa_wleb128u(plinep,aa);
1850 }
1851 }
1852 dwarf_csect->line = currentline;
1853 dwarf_csect->offset = s->offset;
1854 }
1855
1856 /* show change handled */
1857 debug_immcall = 0;
1858 }
1859
1860
1861 static void dwarf32_generate(void)
1862 {
1863 uint8_t *pbuf;
1864 int indx;
1865 struct linelist *ftentry;
1866 struct SAA *paranges, *ppubnames, *pinfo, *pabbrev, *plines, *plinep;
1867 struct SAA *parangesrel, *plinesrel, *pinforel;
1868 struct sectlist *psect;
1869 size_t saalen, linepoff, totlen, highaddr;
1870
1871 /* write epilogues for each line program range */
1872 /* and build aranges section */
1873 paranges = saa_init(1L);
1874 parangesrel = saa_init(1L);
1875 saa_write16(paranges,2); /* dwarf version */
1876 saa_write32(parangesrel, paranges->datalen+4);
1877 saa_write32(parangesrel, (dwarf_infosym << 8) + R_386_32); /* reloc to info */
1878 saa_write32(parangesrel, 0);
1879 saa_write32(paranges,0); /* offset into info */
1880 saa_write8(paranges,4); /* pointer size */
1881 saa_write8(paranges,0); /* not segmented */
1882 saa_write32(paranges,0); /* padding */
1883 /* iterate though sectlist entries */
1884 psect = dwarf_fsect;
1885 totlen = 0;
1886 highaddr = 0;
1887 for (indx = 0; indx < dwarf_nsections; indx++) {
1888 plinep = psect->psaa;
1889 /* Line Number Program Epilogue */
1890 saa_write8(plinep,2); /* std op 2 */
1891 saa_write8(plinep,(sects[psect->section]->len)-psect->offset);
1892 saa_write8(plinep,DW_LNS_extended_op);
1893 saa_write8(plinep,1); /* operand length */
1894 saa_write8(plinep,DW_LNE_end_sequence);
1895 totlen += plinep->datalen;
1896 /* range table relocation entry */
1897 saa_write32(parangesrel, paranges->datalen + 4);
1898 saa_write32(parangesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
1899 saa_write32(parangesrel, (uint32_t) 0);
1900 /* range table entry */
1901 saa_write32(paranges,0x0000); /* range start */
1902 saa_write32(paranges,sects[psect->section]->len); /* range length */
1903 highaddr += sects[psect->section]->len;
1904 /* done with this entry */
1905 psect = psect->next;
1906 }
1907 saa_write32(paranges,0); /* null address */
1908 saa_write32(paranges,0); /* null length */
1909 saalen = paranges->datalen;
1910 arangeslen = saalen + 4;
1911 arangesbuf = pbuf = nasm_malloc(arangeslen);
1912 WRITELONG(pbuf,saalen); /* initial length */
1913 saa_rnbytes(paranges, pbuf, saalen);
1914 saa_free(paranges);
1915
1916 /* build rela.aranges section */
1917 arangesrellen = saalen = parangesrel->datalen;
1918 arangesrelbuf = pbuf = nasm_malloc(arangesrellen);
1919 saa_rnbytes(parangesrel, pbuf, saalen);
1920 saa_free(parangesrel);
1921
1922 /* build pubnames section */
1923 ppubnames = saa_init(1L);
1924 saa_write16(ppubnames,3); /* dwarf version */
1925 saa_write32(ppubnames,0); /* offset into info */
1926 saa_write32(ppubnames,0); /* space used in info */
1927 saa_write32(ppubnames,0); /* end of list */
1928 saalen = ppubnames->datalen;
1929 pubnameslen = saalen + 4;
1930 pubnamesbuf = pbuf = nasm_malloc(pubnameslen);
1931 WRITELONG(pbuf,saalen); /* initial length */
1932 saa_rnbytes(ppubnames, pbuf, saalen);
1933 saa_free(ppubnames);
1934
1935 /* build info section */
1936 pinfo = saa_init(1L);
1937 pinforel = saa_init(1L);
1938 saa_write16(pinfo,2); /* dwarf version */
1939 saa_write32(pinforel, pinfo->datalen + 4);
1940 saa_write32(pinforel, (dwarf_abbrevsym << 8) + R_386_32); /* reloc to abbrev */
1941 saa_write32(pinforel, 0);
1942 saa_write32(pinfo,0); /* offset into abbrev */
1943 saa_write8(pinfo,4); /* pointer size */
1944 saa_write8(pinfo,1); /* abbrviation number LEB128u */
1945 saa_write32(pinforel, pinfo->datalen + 4);
1946 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
1947 saa_write32(pinforel, 0);
1948 saa_write32(pinfo,0); /* DW_AT_low_pc */
1949 saa_write32(pinforel, pinfo->datalen + 4);
1950 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
1951 saa_write32(pinforel, 0);
1952 saa_write32(pinfo,highaddr); /* DW_AT_high_pc */
1953 saa_write32(pinforel, pinfo->datalen + 4);
1954 saa_write32(pinforel, (dwarf_linesym << 8) + R_386_32); /* reloc to line */
1955 saa_write32(pinforel, 0);
1956 saa_write32(pinfo,0); /* DW_AT_stmt_list */
1957 saa_wbytes(pinfo, elf_module, strlen(elf_module)+1);
1958 saa_wbytes(pinfo, nasm_signature, strlen(nasm_signature)+1);
1959 saa_write16(pinfo,DW_LANG_Mips_Assembler);
1960 saa_write8(pinfo,2); /* abbrviation number LEB128u */
1961 saa_write32(pinforel, pinfo->datalen + 4);
1962 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
1963 saa_write32(pinforel, 0);
1964 saa_write32(pinfo,0); /* DW_AT_low_pc */
1965 saa_write32(pinfo,0); /* DW_AT_frame_base */
1966 saa_write8(pinfo,0); /* end of entries */
1967 saalen = pinfo->datalen;
1968 infolen = saalen + 4;
1969 infobuf = pbuf = nasm_malloc(infolen);
1970 WRITELONG(pbuf,saalen); /* initial length */
1971 saa_rnbytes(pinfo, pbuf, saalen);
1972 saa_free(pinfo);
1973
1974 /* build rela.info section */
1975 inforellen = saalen = pinforel->datalen;
1976 inforelbuf = pbuf = nasm_malloc(inforellen);
1977 saa_rnbytes(pinforel, pbuf, saalen);
1978 saa_free(pinforel);
1979
1980 /* build abbrev section */
1981 pabbrev = saa_init(1L);
1982 saa_write8(pabbrev,1); /* entry number LEB128u */
1983 saa_write8(pabbrev,DW_TAG_compile_unit); /* tag LEB128u */
1984 saa_write8(pabbrev,1); /* has children */
1985 /* the following attributes and forms are all LEB128u values */
1986 saa_write8(pabbrev,DW_AT_low_pc);
1987 saa_write8(pabbrev,DW_FORM_addr);
1988 saa_write8(pabbrev,DW_AT_high_pc);
1989 saa_write8(pabbrev,DW_FORM_addr);
1990 saa_write8(pabbrev,DW_AT_stmt_list);
1991 saa_write8(pabbrev,DW_FORM_data4);
1992 saa_write8(pabbrev,DW_AT_name);
1993 saa_write8(pabbrev,DW_FORM_string);
1994 saa_write8(pabbrev,DW_AT_producer);
1995 saa_write8(pabbrev,DW_FORM_string);
1996 saa_write8(pabbrev,DW_AT_language);
1997 saa_write8(pabbrev,DW_FORM_data2);
1998 saa_write16(pabbrev,0); /* end of entry */
1999 /* LEB128u usage same as above */
2000 saa_write8(pabbrev,2); /* entry number */
2001 saa_write8(pabbrev,DW_TAG_subprogram);
2002 saa_write8(pabbrev,0); /* no children */
2003 saa_write8(pabbrev,DW_AT_low_pc);
2004 saa_write8(pabbrev,DW_FORM_addr);
2005 saa_write8(pabbrev,DW_AT_frame_base);
2006 saa_write8(pabbrev,DW_FORM_data4);
2007 saa_write16(pabbrev,0); /* end of entry */
2008 abbrevlen = saalen = pabbrev->datalen;
2009 abbrevbuf = pbuf = nasm_malloc(saalen);
2010 saa_rnbytes(pabbrev, pbuf, saalen);
2011 saa_free(pabbrev);
2012
2013 /* build line section */
2014 /* prolog */
2015 plines = saa_init(1L);
2016 saa_write8(plines,1); /* Minimum Instruction Length */
2017 saa_write8(plines,1); /* Initial value of 'is_stmt' */
2018 saa_write8(plines,line_base); /* Line Base */
2019 saa_write8(plines,line_range); /* Line Range */
2020 saa_write8(plines,opcode_base); /* Opcode Base */
2021 /* standard opcode lengths (# of LEB128u operands) */
2022 saa_write8(plines,0); /* Std opcode 1 length */
2023 saa_write8(plines,1); /* Std opcode 2 length */
2024 saa_write8(plines,1); /* Std opcode 3 length */
2025 saa_write8(plines,1); /* Std opcode 4 length */
2026 saa_write8(plines,1); /* Std opcode 5 length */
2027 saa_write8(plines,0); /* Std opcode 6 length */
2028 saa_write8(plines,0); /* Std opcode 7 length */
2029 saa_write8(plines,0); /* Std opcode 8 length */
2030 saa_write8(plines,1); /* Std opcode 9 length */
2031 saa_write8(plines,0); /* Std opcode 10 length */
2032 saa_write8(plines,0); /* Std opcode 11 length */
2033 saa_write8(plines,1); /* Std opcode 12 length */
2034 /* Directory Table */
2035 saa_write8(plines,0); /* End of table */
2036 /* File Name Table */
2037 ftentry = dwarf_flist;
2038 for (indx = 0;indx<dwarf_numfiles;indx++) {
2039 saa_wbytes(plines, ftentry->filename, (int32_t)(strlen(ftentry->filename) + 1));
2040 saa_write8(plines,0); /* directory LEB128u */
2041 saa_write8(plines,0); /* time LEB128u */
2042 saa_write8(plines,0); /* size LEB128u */
2043 ftentry = ftentry->next;
2044 }
2045 saa_write8(plines,0); /* End of table */
2046 linepoff = plines->datalen;
2047 linelen = linepoff + totlen + 10;
2048 linebuf = pbuf = nasm_malloc(linelen);
2049 WRITELONG(pbuf,linelen-4); /* initial length */
2050 WRITESHORT(pbuf,3); /* dwarf version */
2051 WRITELONG(pbuf,linepoff); /* offset to line number program */
2052 /* write line header */
2053 saalen = linepoff;
2054 saa_rnbytes(plines, pbuf, saalen); /* read a given no. of bytes */
2055 pbuf += linepoff;
2056 saa_free(plines);
2057 /* concatonate line program ranges */
2058 linepoff += 13;
2059 plinesrel = saa_init(1L);
2060 psect = dwarf_fsect;
2061 for (indx = 0; indx < dwarf_nsections; indx++) {
2062 saa_write32(plinesrel, linepoff);
2063 saa_write32(plinesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
2064 saa_write32(plinesrel, (uint32_t) 0);
2065 plinep = psect->psaa;
2066 saalen = plinep->datalen;
2067 saa_rnbytes(plinep, pbuf, saalen);
2068 pbuf += saalen;
2069 linepoff += saalen;
2070 saa_free(plinep);
2071 /* done with this entry */
2072 psect = psect->next;
2073 }
2074
2075
2076 /* build rela.lines section */
2077 linerellen =saalen = plinesrel->datalen;
2078 linerelbuf = pbuf = nasm_malloc(linerellen);
2079 saa_rnbytes(plinesrel, pbuf, saalen);
2080 saa_free(plinesrel);
2081
2082 /* build frame section */
2083 framelen = 4;
2084 framebuf = pbuf = nasm_malloc(framelen);
2085 WRITELONG(pbuf,framelen-4); /* initial length */
2086
2087 /* build loc section */
2088 loclen = 16;
2089 locbuf = pbuf = nasm_malloc(loclen);
2090 WRITELONG(pbuf,0); /* null beginning offset */
2091 WRITELONG(pbuf,0); /* null ending offset */
2092 }
2093
2094 static void dwarf32_cleanup(void)
2095 {
2096 nasm_free(arangesbuf);
2097 nasm_free(arangesrelbuf);
2098 nasm_free(pubnamesbuf);
2099 nasm_free(infobuf);
2100 nasm_free(inforelbuf);
2101 nasm_free(abbrevbuf);
2102 nasm_free(linebuf);
2103 nasm_free(linerelbuf);
2104 nasm_free(framebuf);
2105 nasm_free(locbuf);
2106 }
2107
2108 static void dwarf32_findfile(const char * fname)
2109 {
2110 int finx;
2111 struct linelist *match;
2112
2113 /* return if fname is current file name */
2114 if (dwarf_clist && !(strcmp(fname, dwarf_clist->filename)))
2115 return;
2116
2117 /* search for match */
2118 match = 0;
2119 if (dwarf_flist) {
2120 match = dwarf_flist;
2121 for (finx = 0; finx < dwarf_numfiles; finx++) {
2122 if (!(strcmp(fname, match->filename))) {
2123 dwarf_clist = match;
2124 return;
2125 }
2126 }
2127 }
2128
2129 /* add file name to end of list */
2130 dwarf_clist = (struct linelist *)nasm_malloc(sizeof(struct linelist));
2131 dwarf_numfiles++;
2132 dwarf_clist->line = dwarf_numfiles;
2133 dwarf_clist->filename = nasm_malloc(strlen(fname) + 1);
2134 strcpy(dwarf_clist->filename,fname);
2135 dwarf_clist->next = 0;
2136 if (!dwarf_flist) { /* if first entry */
2137 dwarf_flist = dwarf_elist = dwarf_clist;
2138 dwarf_clist->last = 0;
2139 } else { /* chain to previous entry */
2140 dwarf_elist->next = dwarf_clist;
2141 dwarf_elist = dwarf_clist;
2142 }
2143 }
2144
2145 static void dwarf32_findsect(const int index)
2146 {
2147 int sinx;
2148 struct sectlist *match;
2149 struct SAA *plinep;
2150
2151 /* return if index is current section index */
2152 if (dwarf_csect && (dwarf_csect->section == index))
2153 return;
2154
2155 /* search for match */
2156 match = 0;
2157 if (dwarf_fsect) {
2158 match = dwarf_fsect;
2159 for (sinx = 0; sinx < dwarf_nsections; sinx++) {
2160 if ((match->section == index)) {
2161 dwarf_csect = match;
2162 return;
2163 }
2164 match = match->next;
2165 }
2166 }
2167
2168 /* add entry to end of list */
2169 dwarf_csect = (struct sectlist *)nasm_malloc(sizeof(struct sectlist));
2170 dwarf_nsections++;
2171 dwarf_csect->psaa = plinep = saa_init(1L);
2172 dwarf_csect->line = 1;
2173 dwarf_csect->offset = 0;
2174 dwarf_csect->file = 1;
2175 dwarf_csect->section = index;
2176 dwarf_csect->next = 0;
2177 /* set relocatable address at start of line program */
2178 saa_write8(plinep,DW_LNS_extended_op);
2179 saa_write8(plinep,5); /* operand length */
2180 saa_write8(plinep,DW_LNE_set_address);
2181 saa_write32(plinep,0); /* Start Address */
2182
2183 if (!dwarf_fsect) { /* if first entry */
2184 dwarf_fsect = dwarf_esect = dwarf_csect;
2185 dwarf_csect->last = 0;
2186 } else { /* chain to previous entry */
2187 dwarf_esect->next = dwarf_csect;
2188 dwarf_esect = dwarf_csect;
2189 }
2190 }
2191
2192 #endif /* OF_ELF */
Adding AVX-512 features