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outelf32/64: fix uninitialized rbtree
[nasm/sigaren-mirror.git] / output / outelf32.c
blob9edce3709bc417d6c022ca4aaac895252f3a4edd
1 /* outelf.c output routines for the Netwide Assembler to produce
2 * ELF32 (i386 of course) object file format
3 *
4 * The Netwide Assembler is copyright (C) 1996 Simon Tatham and
5 * Julian Hall. All rights reserved. The software is
6 * redistributable under the license given in the file "LICENSE"
7 * distributed in the NASM archive.
8 */
9
10 #include "compiler.h"
11
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <string.h>
15 #include <ctype.h>
16 #include <inttypes.h>
17
18 #include "nasm.h"
19 #include "nasmlib.h"
20 #include "saa.h"
21 #include "raa.h"
22 #include "stdscan.h"
23 #include "outform.h"
24 #include "outlib.h"
25 #include "rbtree.h"
26
27 #ifdef OF_ELF32
28
29 /*
30 * Relocation types.
31 */
32 enum reloc_type {
33 R_386_32 = 1, /* ordinary absolute relocation */
34 R_386_PC32 = 2, /* PC-relative relocation */
35 R_386_GOT32 = 3, /* an offset into GOT */
36 R_386_PLT32 = 4, /* a PC-relative offset into PLT */
37 R_386_COPY = 5, /* ??? */
38 R_386_GLOB_DAT = 6, /* ??? */
39 R_386_JUMP_SLOT = 7, /* ??? */
40 R_386_RELATIVE = 8, /* ??? */
41 R_386_GOTOFF = 9, /* an offset from GOT base */
42 R_386_GOTPC = 10, /* a PC-relative offset _to_ GOT */
43 R_386_TLS_TPOFF = 14, /* Offset in static TLS block */
44 R_386_TLS_IE = 15, /* Address of GOT entry for static TLS
45 block offset */
46 /* These are GNU extensions, but useful */
47 R_386_16 = 20, /* A 16-bit absolute relocation */
48 R_386_PC16 = 21, /* A 16-bit PC-relative relocation */
49 R_386_8 = 22, /* An 8-bit absolute relocation */
50 R_386_PC8 = 23 /* An 8-bit PC-relative relocation */
51 };
52
53 struct Reloc {
54 struct Reloc *next;
55 int32_t address; /* relative to _start_ of section */
56 int32_t symbol; /* symbol index */
57 int type; /* type of relocation */
58 };
59
60 struct Symbol {
61 struct rbtree symv; /* symbol value and symbol rbtree */
62 int32_t strpos; /* string table position of name */
63 int32_t section; /* section ID of the symbol */
64 int type; /* symbol type */
65 int other; /* symbol visibility */
66 int32_t size; /* size of symbol */
67 int32_t globnum; /* symbol table offset if global */
68 struct Symbol *nextfwd; /* list of unresolved-size symbols */
69 char *name; /* used temporarily if in above list */
70 };
71
72 #define SHT_PROGBITS 1
73 #define SHT_NOBITS 8
74
75 #define SHF_WRITE 1
76 #define SHF_ALLOC 2
77 #define SHF_EXECINSTR 4
78 #define SHF_TLS (1 << 10) /* Section holds thread-local data. */
79
80 struct Section {
81 struct SAA *data;
82 uint32_t len, size, nrelocs;
83 int32_t index;
84 int type; /* SHT_PROGBITS or SHT_NOBITS */
85 int align; /* alignment: power of two */
86 uint32_t flags; /* section flags */
87 char *name;
88 struct SAA *rel;
89 int32_t rellen;
90 struct Reloc *head, **tail;
91 struct rbtree *gsyms; /* global symbols in section */
92 };
93
94 #define SECT_DELTA 32
95 static struct Section **sects;
96 static int nsects, sectlen;
97
98 #define SHSTR_DELTA 256
99 static char *shstrtab;
100 static int shstrtablen, shstrtabsize;
101
102 static struct SAA *syms;
103 static uint32_t nlocals, nglobs;
104
105 static int32_t def_seg;
106
107 static struct RAA *bsym;
108
109 static struct SAA *strs;
110 static uint32_t strslen;
111
112 static FILE *elffp;
113 static efunc error;
114 static evalfunc evaluate;
115
116 static struct Symbol *fwds;
117
118 static char elf_module[FILENAME_MAX];
119
120 static uint8_t elf_osabi = 0; /* Default OSABI = 0 (System V or Linux) */
121 static uint8_t elf_abiver = 0; /* Current ABI version */
122
123 extern struct ofmt of_elf32;
124 extern struct ofmt of_elf;
125
126 #define SHN_ABS 0xFFF1
127 #define SHN_COMMON 0xFFF2
128 #define SHN_UNDEF 0
129
130 #define SYM_GLOBAL 0x10
131
132 #define SHT_RELA 4 /* Relocation entries with addends */
133
134 #define STT_NOTYPE 0 /* Symbol type is unspecified */
135 #define STT_OBJECT 1 /* Symbol is a data object */
136 #define STT_FUNC 2 /* Symbol is a code object */
137 #define STT_SECTION 3 /* Symbol associated with a section */
138 #define STT_FILE 4 /* Symbol's name is file name */
139 #define STT_COMMON 5 /* Symbol is a common data object */
140 #define STT_TLS 6 /* Symbol is thread-local data object*/
141 #define STT_NUM 7 /* Number of defined types. */
142
143 #define STV_DEFAULT 0
144 #define STV_INTERNAL 1
145 #define STV_HIDDEN 2
146 #define STV_PROTECTED 3
147
148 #define GLOBAL_TEMP_BASE 1048576 /* bigger than any reasonable sym id */
149
150 #define SEG_ALIGN 16 /* alignment of sections in file */
151 #define SEG_ALIGN_1 (SEG_ALIGN-1)
152
153 /* Definitions in lieu of dwarf.h */
154 #define DW_TAG_compile_unit 0x11
155 #define DW_TAG_subprogram 0x2e
156 #define DW_AT_name 0x03
157 #define DW_AT_stmt_list 0x10
158 #define DW_AT_low_pc 0x11
159 #define DW_AT_high_pc 0x12
160 #define DW_AT_language 0x13
161 #define DW_AT_producer 0x25
162 #define DW_AT_frame_base 0x40
163 #define DW_FORM_addr 0x01
164 #define DW_FORM_data2 0x05
165 #define DW_FORM_data4 0x06
166 #define DW_FORM_string 0x08
167 #define DW_LNS_extended_op 0
168 #define DW_LNS_advance_pc 2
169 #define DW_LNS_advance_line 3
170 #define DW_LNS_set_file 4
171 #define DW_LNE_end_sequence 1
172 #define DW_LNE_set_address 2
173 #define DW_LNE_define_file 3
174 #define DW_LANG_Mips_Assembler 0x8001
175
176 #define SOC(ln,aa) ln - line_base + (line_range * aa) + opcode_base
177
178 static struct ELF_SECTDATA {
179 void *data;
180 int32_t len;
181 bool is_saa;
182 } *elf_sects;
183 static int elf_nsect, nsections;
184 static int32_t elf_foffs;
185
186 static void elf_write(void);
187 static void elf_sect_write(struct Section *, const uint8_t *,
188 uint32_t);
189 static void elf_section_header(int, int, int, void *, bool, int32_t, int, int,
190 int, int);
191 static void elf_write_sections(void);
192 static struct SAA *elf_build_symtab(int32_t *, int32_t *);
193 static struct SAA *elf_build_reltab(int32_t *, struct Reloc *);
194 static void add_sectname(char *, char *);
195
196 /* this stuff is needed for the stabs debugging format */
197 #define N_SO 0x64 /* ID for main source file */
198 #define N_SOL 0x84 /* ID for sub-source file */
199 #define N_BINCL 0x82
200 #define N_EINCL 0xA2
201 #define N_SLINE 0x44
202 #define TY_STABSSYMLIN 0x40 /* ouch */
203
204 struct stabentry {
205 uint32_t n_strx;
206 uint8_t n_type;
207 uint8_t n_other;
208 uint16_t n_desc;
209 uint32_t n_value;
210 };
211
212 struct erel {
213 int offset, info;
214 };
215
216 struct symlininfo {
217 int offset;
218 int section; /* section index */
219 char *name; /* shallow-copied pointer of section name */
220 };
221
222 struct linelist {
223 struct symlininfo info;
224 int line;
225 char *filename;
226 struct linelist *next;
227 struct linelist *last;
228 };
229
230 struct sectlist {
231 struct SAA *psaa;
232 int section;
233 int line;
234 int offset;
235 int file;
236 struct sectlist *next;
237 struct sectlist *last;
238 };
239
240 /* common debug variables */
241 static int currentline = 1;
242 static int debug_immcall = 0;
243
244 /* stabs debug variables */
245 static struct linelist *stabslines = 0;
246 static int numlinestabs = 0;
247 static char *stabs_filename = 0;
248 static int symtabsection;
249 static uint8_t *stabbuf = 0, *stabstrbuf = 0, *stabrelbuf = 0;
250 static int stablen, stabstrlen, stabrellen;
251
252 /* dwarf debug variables */
253 static struct linelist *dwarf_flist = 0, *dwarf_clist = 0, *dwarf_elist = 0;
254 static struct sectlist *dwarf_fsect = 0, *dwarf_csect = 0, *dwarf_esect = 0;
255 static int dwarf_numfiles = 0, dwarf_nsections;
256 static uint8_t *arangesbuf = 0, *arangesrelbuf = 0, *pubnamesbuf = 0, *infobuf = 0, *inforelbuf = 0,
257 *abbrevbuf = 0, *linebuf = 0, *linerelbuf = 0, *framebuf = 0, *locbuf = 0;
258 static int8_t line_base = -5, line_range = 14, opcode_base = 13;
259 static int arangeslen, arangesrellen, pubnameslen, infolen, inforellen,
260 abbrevlen, linelen, linerellen, framelen, loclen;
261 static int32_t dwarf_infosym, dwarf_abbrevsym, dwarf_linesym;
262
263 static struct dfmt df_dwarf;
264 static struct dfmt df_stabs;
265 static struct Symbol *lastsym;
266
267 /* common debugging routines */
268 void debug32_typevalue(int32_t);
269 void debug32_init(struct ofmt *, void *, FILE *, efunc);
270 void debug32_deflabel(char *, int32_t, int64_t, int, char *);
271 void debug32_directive(const char *, const char *);
272
273 /* stabs debugging routines */
274 void stabs32_linenum(const char *filename, int32_t linenumber, int32_t);
275 void stabs32_output(int, void *);
276 void stabs32_generate(void);
277 void stabs32_cleanup(void);
278
279 /* dwarf debugging routines */
280 void dwarf32_linenum(const char *filename, int32_t linenumber, int32_t);
281 void dwarf32_output(int, void *);
282 void dwarf32_generate(void);
283 void dwarf32_cleanup(void);
284 void dwarf32_findfile(const char *);
285 void dwarf32_findsect(const int);
286 void saa_wleb128u(struct SAA *, int);
287 void saa_wleb128s(struct SAA *, int);
288
289 /*
290 * Special section numbers which are used to define ELF special
291 * symbols, which can be used with WRT to provide PIC and TLS
292 * relocation types.
293 */
294 static int32_t elf_gotpc_sect, elf_gotoff_sect;
295 static int32_t elf_got_sect, elf_plt_sect;
296 static int32_t elf_sym_sect, elf_tlsie_sect;
297
298 static void elf_init(FILE * fp, efunc errfunc, ldfunc ldef, evalfunc eval)
299 {
300 elffp = fp;
301 error = errfunc;
302 evaluate = eval;
303 (void)ldef; /* placate optimisers */
304 sects = NULL;
305 nsects = sectlen = 0;
306 syms = saa_init((int32_t)sizeof(struct Symbol));
307 nlocals = nglobs = 0;
308 bsym = raa_init();
309 strs = saa_init(1L);
310 saa_wbytes(strs, "\0", 1L);
311 saa_wbytes(strs, elf_module, strlen(elf_module)+1);
312 strslen = 2 + strlen(elf_module);
313 shstrtab = NULL;
314 shstrtablen = shstrtabsize = 0;;
315 add_sectname("", "");
316
317 fwds = NULL;
318
319 elf_gotpc_sect = seg_alloc();
320 ldef("..gotpc", elf_gotpc_sect + 1, 0L, NULL, false, false, &of_elf32,
321 error);
322 elf_gotoff_sect = seg_alloc();
323 ldef("..gotoff", elf_gotoff_sect + 1, 0L, NULL, false, false, &of_elf32,
324 error);
325 elf_got_sect = seg_alloc();
326 ldef("..got", elf_got_sect + 1, 0L, NULL, false, false, &of_elf32,
327 error);
328 elf_plt_sect = seg_alloc();
329 ldef("..plt", elf_plt_sect + 1, 0L, NULL, false, false, &of_elf32,
330 error);
331 elf_sym_sect = seg_alloc();
332 ldef("..sym", elf_sym_sect + 1, 0L, NULL, false, false, &of_elf32,
333 error);
334 elf_tlsie_sect = seg_alloc();
335 ldef("..tlsie", elf_tlsie_sect + 1, 0L, NULL, false, false, &of_elf32,
336 error);
337
338 def_seg = seg_alloc();
339 }
340
341 static void elf_init_hack(FILE * fp, efunc errfunc, ldfunc ldef,
342 evalfunc eval)
343 {
344 of_elf32.current_dfmt = of_elf.current_dfmt; /* Sync debugging format */
345 elf_init(fp, errfunc, ldef, eval);
346 }
347
348 static void elf_cleanup(int debuginfo)
349 {
350 struct Reloc *r;
351 int i;
352
353 (void)debuginfo;
354
355 elf_write();
356 fclose(elffp);
357 for (i = 0; i < nsects; i++) {
358 if (sects[i]->type != SHT_NOBITS)
359 saa_free(sects[i]->data);
360 if (sects[i]->head)
361 saa_free(sects[i]->rel);
362 while (sects[i]->head) {
363 r = sects[i]->head;
364 sects[i]->head = sects[i]->head->next;
365 nasm_free(r);
366 }
367 }
368 nasm_free(sects);
369 saa_free(syms);
370 raa_free(bsym);
371 saa_free(strs);
372 if (of_elf32.current_dfmt) {
373 of_elf32.current_dfmt->cleanup();
374 }
375 }
376
377 static void add_sectname(char *firsthalf, char *secondhalf)
378 {
379 int len = strlen(firsthalf) + strlen(secondhalf);
380 while (shstrtablen + len + 1 > shstrtabsize)
381 shstrtab = nasm_realloc(shstrtab, (shstrtabsize += SHSTR_DELTA));
382 strcpy(shstrtab + shstrtablen, firsthalf);
383 strcat(shstrtab + shstrtablen, secondhalf);
384 shstrtablen += len + 1;
385 }
386
387 static int elf_make_section(char *name, int type, int flags, int align)
388 {
389 struct Section *s;
390
391 s = nasm_malloc(sizeof(*s));
392
393 if (type != SHT_NOBITS)
394 s->data = saa_init(1L);
395 s->head = NULL;
396 s->tail = &s->head;
397 s->len = s->size = 0;
398 s->nrelocs = 0;
399 if (!strcmp(name, ".text"))
400 s->index = def_seg;
401 else
402 s->index = seg_alloc();
403 add_sectname("", name);
404 s->name = nasm_malloc(1 + strlen(name));
405 strcpy(s->name, name);
406 s->type = type;
407 s->flags = flags;
408 s->align = align;
409 s->gsyms = NULL;
410
411 if (nsects >= sectlen)
412 sects =
413 nasm_realloc(sects, (sectlen += SECT_DELTA) * sizeof(*sects));
414 sects[nsects++] = s;
415
416 return nsects - 1;
417 }
418
419 static int32_t elf_section_names(char *name, int pass, int *bits)
420 {
421 char *p;
422 unsigned flags_and, flags_or;
423 int type, align, i;
424
425 /*
426 * Default is 32 bits.
427 */
428 if (!name) {
429 *bits = 32;
430 return def_seg;
431 }
432
433 p = name;
434 while (*p && !nasm_isspace(*p))
435 p++;
436 if (*p)
437 *p++ = '\0';
438 flags_and = flags_or = type = align = 0;
439
440 while (*p && nasm_isspace(*p))
441 p++;
442 while (*p) {
443 char *q = p;
444 while (*p && !nasm_isspace(*p))
445 p++;
446 if (*p)
447 *p++ = '\0';
448 while (*p && nasm_isspace(*p))
449 p++;
450
451 if (!nasm_strnicmp(q, "align=", 6)) {
452 align = atoi(q + 6);
453 if (align == 0)
454 align = 1;
455 if ((align - 1) & align) { /* means it's not a power of two */
456 error(ERR_NONFATAL, "section alignment %d is not"
457 " a power of two", align);
458 align = 1;
459 }
460 } else if (!nasm_stricmp(q, "alloc")) {
461 flags_and |= SHF_ALLOC;
462 flags_or |= SHF_ALLOC;
463 } else if (!nasm_stricmp(q, "noalloc")) {
464 flags_and |= SHF_ALLOC;
465 flags_or &= ~SHF_ALLOC;
466 } else if (!nasm_stricmp(q, "exec")) {
467 flags_and |= SHF_EXECINSTR;
468 flags_or |= SHF_EXECINSTR;
469 } else if (!nasm_stricmp(q, "noexec")) {
470 flags_and |= SHF_EXECINSTR;
471 flags_or &= ~SHF_EXECINSTR;
472 } else if (!nasm_stricmp(q, "write")) {
473 flags_and |= SHF_WRITE;
474 flags_or |= SHF_WRITE;
475 } else if (!nasm_stricmp(q, "tls")) {
476 flags_and |= SHF_TLS;
477 flags_or |= SHF_TLS;
478 } else if (!nasm_stricmp(q, "nowrite")) {
479 flags_and |= SHF_WRITE;
480 flags_or &= ~SHF_WRITE;
481 } else if (!nasm_stricmp(q, "progbits")) {
482 type = SHT_PROGBITS;
483 } else if (!nasm_stricmp(q, "nobits")) {
484 type = SHT_NOBITS;
485 } else if (pass == 1) error(ERR_WARNING, "Unknown section attribute '%s' ignored on"
486 " declaration of section `%s'", q, name);
487 }
488
489 if (!strcmp(name, ".comment") ||
490 !strcmp(name, ".shstrtab") ||
491 !strcmp(name, ".symtab") || !strcmp(name, ".strtab")) {
492 error(ERR_NONFATAL, "attempt to redefine reserved section"
493 "name `%s'", name);
494 return NO_SEG;
495 }
496
497 for (i = 0; i < nsects; i++)
498 if (!strcmp(name, sects[i]->name))
499 break;
500 if (i == nsects) {
501 if (!strcmp(name, ".text"))
502 i = elf_make_section(name, SHT_PROGBITS,
503 SHF_ALLOC | SHF_EXECINSTR, 16);
504 else if (!strcmp(name, ".rodata"))
505 i = elf_make_section(name, SHT_PROGBITS, SHF_ALLOC, 4);
506 else if (!strcmp(name, ".data"))
507 i = elf_make_section(name, SHT_PROGBITS,
508 SHF_ALLOC | SHF_WRITE, 4);
509 else if (!strcmp(name, ".bss"))
510 i = elf_make_section(name, SHT_NOBITS,
511 SHF_ALLOC | SHF_WRITE, 4);
512 else if (!strcmp(name, ".tdata"))
513 i = elf_make_section(name, SHT_PROGBITS,
514 SHF_ALLOC | SHF_WRITE | SHF_TLS, 4);
515 else if (!strcmp(name, ".tbss"))
516 i = elf_make_section(name, SHT_NOBITS,
517 SHF_ALLOC | SHF_WRITE | SHF_TLS, 4);
518 else
519 i = elf_make_section(name, SHT_PROGBITS, SHF_ALLOC, 1);
520 if (type)
521 sects[i]->type = type;
522 if (align)
523 sects[i]->align = align;
524 sects[i]->flags &= ~flags_and;
525 sects[i]->flags |= flags_or;
526 } else if (pass == 1) {
527 if ((type && sects[i]->type != type)
528 || (align && sects[i]->align != align)
529 || (flags_and && ((sects[i]->flags & flags_and) != flags_or)))
530 error(ERR_WARNING, "section attributes ignored on"
531 " redeclaration of section `%s'", name);
532 }
533
534 return sects[i]->index;
535 }
536
537 static void elf_deflabel(char *name, int32_t segment, int64_t offset,
538 int is_global, char *special)
539 {
540 int pos = strslen;
541 struct Symbol *sym;
542 bool special_used = false;
543
544 #if defined(DEBUG) && DEBUG>2
545 fprintf(stderr,
546 " elf_deflabel: %s, seg=%ld, off=%ld, is_global=%d, %s\n",
547 name, segment, offset, is_global, special);
548 #endif
549 if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
550 /*
551 * This is a NASM special symbol. We never allow it into
552 * the ELF symbol table, even if it's a valid one. If it
553 * _isn't_ a valid one, we should barf immediately.
554 */
555 if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") &&
556 strcmp(name, "..got") && strcmp(name, "..plt") &&
557 strcmp(name, "..sym") && strcmp(name, "..tlsie"))
558 error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
559 return;
560 }
561
562 if (is_global == 3) {
563 struct Symbol **s;
564 /*
565 * Fix up a forward-reference symbol size from the first
566 * pass.
567 */
568 for (s = &fwds; *s; s = &(*s)->nextfwd)
569 if (!strcmp((*s)->name, name)) {
570 struct tokenval tokval;
571 expr *e;
572 char *p = special;
573
574 while (*p && !nasm_isspace(*p))
575 p++;
576 while (*p && nasm_isspace(*p))
577 p++;
578 stdscan_reset();
579 stdscan_bufptr = p;
580 tokval.t_type = TOKEN_INVALID;
581 e = evaluate(stdscan, NULL, &tokval, NULL, 1, error, NULL);
582 if (e) {
583 if (!is_simple(e))
584 error(ERR_NONFATAL, "cannot use relocatable"
585 " expression as symbol size");
586 else
587 (*s)->size = reloc_value(e);
588 }
589
590 /*
591 * Remove it from the list of unresolved sizes.
592 */
593 nasm_free((*s)->name);
594 *s = (*s)->nextfwd;
595 return;
596 }
597 return; /* it wasn't an important one */
598 }
599
600 saa_wbytes(strs, name, (int32_t)(1 + strlen(name)));
601 strslen += 1 + strlen(name);
602
603 lastsym = sym = saa_wstruct(syms);
604
605 memset(&sym->symv, 0, sizeof(struct rbtree));
606
607 sym->strpos = pos;
608 sym->type = is_global ? SYM_GLOBAL : 0;
609 sym->other = STV_DEFAULT;
610 sym->size = 0;
611 if (segment == NO_SEG)
612 sym->section = SHN_ABS;
613 else {
614 int i;
615 sym->section = SHN_UNDEF;
616 if (nsects == 0 && segment == def_seg) {
617 int tempint;
618 if (segment != elf_section_names(".text", 2, &tempint))
619 error(ERR_PANIC,
620 "strange segment conditions in ELF driver");
621 sym->section = nsects;
622 } else {
623 for (i = 0; i < nsects; i++)
624 if (segment == sects[i]->index) {
625 sym->section = i + 1;
626 break;
627 }
628 }
629 }
630
631 if (is_global == 2) {
632 sym->size = offset;
633 sym->symv.key = 0;
634 sym->section = SHN_COMMON;
635 /*
636 * We have a common variable. Check the special text to see
637 * if it's a valid number and power of two; if so, store it
638 * as the alignment for the common variable.
639 */
640 if (special) {
641 bool err;
642 sym->symv.key = readnum(special, &err);
643 if (err)
644 error(ERR_NONFATAL, "alignment constraint `%s' is not a"
645 " valid number", special);
646 else if ((sym->symv.key | (sym->symv.key - 1))
647 != 2 * sym->symv.key - 1)
648 error(ERR_NONFATAL, "alignment constraint `%s' is not a"
649 " power of two", special);
650 }
651 special_used = true;
652 } else
653 sym->symv.key = (sym->section == SHN_UNDEF ? 0 : offset);
654
655 if (sym->type == SYM_GLOBAL) {
656 /*
657 * If sym->section == SHN_ABS, then the first line of the
658 * else section would cause a core dump, because its a reference
659 * beyond the end of the section array.
660 * This behaviour is exhibited by this code:
661 * GLOBAL crash_nasm
662 * crash_nasm equ 0
663 * To avoid such a crash, such requests are silently discarded.
664 * This may not be the best solution.
665 */
666 if (sym->section == SHN_UNDEF || sym->section == SHN_COMMON) {
667 bsym = raa_write(bsym, segment, nglobs);
668 } else if (sym->section != SHN_ABS) {
669 /*
670 * This is a global symbol; so we must add it to the rbtree
671 * of global symbols in its section.
672 *
673 * In addition, we check the special text for symbol
674 * type and size information.
675 */
676 sects[sym->section-1]->gsyms =
677 rb_insert(sects[sym->section-1]->gsyms, &sym->symv);
678
679 if (special) {
680 int n = strcspn(special, " \t");
681
682 if (!nasm_strnicmp(special, "function", n))
683 sym->type |= STT_FUNC;
684 else if (!nasm_strnicmp(special, "data", n) ||
685 !nasm_strnicmp(special, "object", n))
686 sym->type |= STT_OBJECT;
687 else if (!nasm_strnicmp(special, "notype", n))
688 sym->type |= STT_NOTYPE;
689 else
690 error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
691 n, special);
692 special += n;
693
694 while (nasm_isspace(*special))
695 ++special;
696 if (*special) {
697 n = strcspn(special, " \t");
698 if (!nasm_strnicmp(special, "default", n))
699 sym->other = STV_DEFAULT;
700 else if (!nasm_strnicmp(special, "internal", n))
701 sym->other = STV_INTERNAL;
702 else if (!nasm_strnicmp(special, "hidden", n))
703 sym->other = STV_HIDDEN;
704 else if (!nasm_strnicmp(special, "protected", n))
705 sym->other = STV_PROTECTED;
706 else
707 n = 0;
708 special += n;
709 }
710
711 if (*special) {
712 struct tokenval tokval;
713 expr *e;
714 int fwd = 0;
715 char *saveme = stdscan_bufptr; /* bugfix? fbk 8/10/00 */
716
717 while (special[n] && nasm_isspace(special[n]))
718 n++;
719 /*
720 * We have a size expression; attempt to
721 * evaluate it.
722 */
723 stdscan_reset();
724 stdscan_bufptr = special + n;
725 tokval.t_type = TOKEN_INVALID;
726 e = evaluate(stdscan, NULL, &tokval, &fwd, 0, error,
727 NULL);
728 if (fwd) {
729 sym->nextfwd = fwds;
730 fwds = sym;
731 sym->name = nasm_strdup(name);
732 } else if (e) {
733 if (!is_simple(e))
734 error(ERR_NONFATAL, "cannot use relocatable"
735 " expression as symbol size");
736 else
737 sym->size = reloc_value(e);
738 }
739 stdscan_bufptr = saveme; /* bugfix? fbk 8/10/00 */
740 }
741 special_used = true;
742 }
743 /*
744 * If TLS segment, mark symbol accordingly.
745 */
746 if (sects[sym->section - 1]->flags & SHF_TLS) {
747 sym->type &= 0xf0;
748 sym->type |= STT_TLS;
749 }
750 }
751 sym->globnum = nglobs;
752 nglobs++;
753 } else
754 nlocals++;
755
756 if (special && !special_used)
757 error(ERR_NONFATAL, "no special symbol features supported here");
758 }
759
760 static void elf_add_reloc(struct Section *sect, int32_t segment, int type)
761 {
762 struct Reloc *r;
763
764 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
765 sect->tail = &r->next;
766 r->next = NULL;
767
768 r->address = sect->len;
769 if (segment == NO_SEG)
770 r->symbol = 0;
771 else {
772 int i;
773 r->symbol = 0;
774 for (i = 0; i < nsects; i++)
775 if (segment == sects[i]->index)
776 r->symbol = i + 2;
777 if (!r->symbol)
778 r->symbol = GLOBAL_TEMP_BASE + raa_read(bsym, segment);
779 }
780 r->type = type;
781
782 sect->nrelocs++;
783 }
784
785 /*
786 * This routine deals with ..got and ..sym relocations: the more
787 * complicated kinds. In shared-library writing, some relocations
788 * with respect to global symbols must refer to the precise symbol
789 * rather than referring to an offset from the base of the section
790 * _containing_ the symbol. Such relocations call to this routine,
791 * which searches the symbol list for the symbol in question.
792 *
793 * R_386_GOT32 references require the _exact_ symbol address to be
794 * used; R_386_32 references can be at an offset from the symbol.
795 * The boolean argument `exact' tells us this.
796 *
797 * Return value is the adjusted value of `addr', having become an
798 * offset from the symbol rather than the section. Should always be
799 * zero when returning from an exact call.
800 *
801 * Limitation: if you define two symbols at the same place,
802 * confusion will occur.
803 *
804 * Inefficiency: we search, currently, using a linked list which
805 * isn't even necessarily sorted.
806 */
807 static int32_t elf_add_gsym_reloc(struct Section *sect,
808 int32_t segment, uint32_t offset,
809 int type, bool exact)
810 {
811 struct Reloc *r;
812 struct Section *s;
813 struct Symbol *sym;
814 struct rbtree *srb;
815 int i;
816
817 /*
818 * First look up the segment/offset pair and find a global
819 * symbol corresponding to it. If it's not one of our segments,
820 * then it must be an external symbol, in which case we're fine
821 * doing a normal elf_add_reloc after first sanity-checking
822 * that the offset from the symbol is zero.
823 */
824 s = NULL;
825 for (i = 0; i < nsects; i++)
826 if (segment == sects[i]->index) {
827 s = sects[i];
828 break;
829 }
830 if (!s) {
831 if (exact && offset != 0)
832 error(ERR_NONFATAL, "unable to find a suitable global symbol"
833 " for this reference");
834 else
835 elf_add_reloc(sect, segment, type);
836 return offset;
837 }
838
839 srb = rb_search(s->gsyms, offset);
840 if (!srb || (exact && srb->key != offset)) {
841 error(ERR_NONFATAL, "unable to find a suitable global symbol"
842 " for this reference");
843 return 0;
844 }
845 sym = container_of(srb, struct Symbol, symv);
846
847 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
848 sect->tail = &r->next;
849 r->next = NULL;
850
851 r->address = sect->len;
852 r->symbol = GLOBAL_TEMP_BASE + sym->globnum;
853 r->type = type;
854
855 sect->nrelocs++;
856
857 return offset - sym->symv.key;
858 }
859
860 static void elf_out(int32_t segto, const void *data,
861 enum out_type type, uint64_t size,
862 int32_t segment, int32_t wrt)
863 {
864 struct Section *s;
865 int32_t addr;
866 uint8_t mydata[4], *p;
867 int i;
868 static struct symlininfo sinfo;
869
870 /*
871 * handle absolute-assembly (structure definitions)
872 */
873 if (segto == NO_SEG) {
874 if (type != OUT_RESERVE)
875 error(ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
876 " space");
877 return;
878 }
879
880 s = NULL;
881 for (i = 0; i < nsects; i++)
882 if (segto == sects[i]->index) {
883 s = sects[i];
884 break;
885 }
886 if (!s) {
887 int tempint; /* ignored */
888 if (segto != elf_section_names(".text", 2, &tempint))
889 error(ERR_PANIC, "strange segment conditions in ELF driver");
890 else {
891 s = sects[nsects - 1];
892 i = nsects - 1;
893 }
894 }
895
896 /* again some stabs debugging stuff */
897 if (of_elf32.current_dfmt) {
898 sinfo.offset = s->len;
899 sinfo.section = i;
900 sinfo.name = s->name;
901 of_elf32.current_dfmt->debug_output(TY_STABSSYMLIN, &sinfo);
902 }
903 /* end of debugging stuff */
904
905 if (s->type == SHT_NOBITS && type != OUT_RESERVE) {
906 error(ERR_WARNING, "attempt to initialize memory in"
907 " BSS section `%s': ignored", s->name);
908 s->len += realsize(type, size);
909 return;
910 }
911
912 if (type == OUT_RESERVE) {
913 if (s->type == SHT_PROGBITS) {
914 error(ERR_WARNING, "uninitialized space declared in"
915 " non-BSS section `%s': zeroing", s->name);
916 elf_sect_write(s, NULL, size);
917 } else
918 s->len += size;
919 } else if (type == OUT_RAWDATA) {
920 if (segment != NO_SEG)
921 error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
922 elf_sect_write(s, data, size);
923 } else if (type == OUT_ADDRESS) {
924 bool gnu16 = false;
925 addr = *(int64_t *)data;
926 if (segment != NO_SEG) {
927 if (segment % 2) {
928 error(ERR_NONFATAL, "ELF format does not support"
929 " segment base references");
930 } else {
931 if (wrt == NO_SEG) {
932 if (size == 2) {
933 gnu16 = true;
934 elf_add_reloc(s, segment, R_386_16);
935 } else {
936 elf_add_reloc(s, segment, R_386_32);
937 }
938 } else if (wrt == elf_gotpc_sect + 1) {
939 /*
940 * The user will supply GOT relative to $$. ELF
941 * will let us have GOT relative to $. So we
942 * need to fix up the data item by $-$$.
943 */
944 addr += s->len;
945 elf_add_reloc(s, segment, R_386_GOTPC);
946 } else if (wrt == elf_gotoff_sect + 1) {
947 elf_add_reloc(s, segment, R_386_GOTOFF);
948 } else if (wrt == elf_tlsie_sect + 1) {
949 addr = elf_add_gsym_reloc(s, segment, addr,
950 R_386_TLS_IE, true);
951 } else if (wrt == elf_got_sect + 1) {
952 addr = elf_add_gsym_reloc(s, segment, addr,
953 R_386_GOT32, true);
954 } else if (wrt == elf_sym_sect + 1) {
955 if (size == 2) {
956 gnu16 = true;
957 addr = elf_add_gsym_reloc(s, segment, addr,
958 R_386_16, false);
959 } else {
960 addr = elf_add_gsym_reloc(s, segment, addr,
961 R_386_32, false);
962 }
963 } else if (wrt == elf_plt_sect + 1) {
964 error(ERR_NONFATAL, "ELF format cannot produce non-PC-"
965 "relative PLT references");
966 } else {
967 error(ERR_NONFATAL, "ELF format does not support this"
968 " use of WRT");
969 wrt = NO_SEG; /* we can at least _try_ to continue */
970 }
971 }
972 }
973 p = mydata;
974 if (gnu16) {
975 error(ERR_WARNING | ERR_WARN_GNUELF,
976 "16-bit relocations in ELF is a GNU extension");
977 WRITESHORT(p, addr);
978 } else {
979 if (size != 4 && segment != NO_SEG) {
980 error(ERR_NONFATAL,
981 "Unsupported non-32-bit ELF relocation");
982 }
983 WRITELONG(p, addr);
984 }
985 elf_sect_write(s, mydata, size);
986 } else if (type == OUT_REL2ADR) {
987 if (segment == segto)
988 error(ERR_PANIC, "intra-segment OUT_REL2ADR");
989 if (segment != NO_SEG && segment % 2) {
990 error(ERR_NONFATAL, "ELF format does not support"
991 " segment base references");
992 } else {
993 if (wrt == NO_SEG) {
994 error(ERR_WARNING | ERR_WARN_GNUELF,
995 "16-bit relocations in ELF is a GNU extension");
996 elf_add_reloc(s, segment, R_386_PC16);
997 } else {
998 error(ERR_NONFATAL,
999 "Unsupported non-32-bit ELF relocation");
1000 }
1001 }
1002 p = mydata;
1003 WRITESHORT(p, *(int64_t *)data - size);
1004 elf_sect_write(s, mydata, 2L);
1005 } else if (type == OUT_REL4ADR) {
1006 if (segment == segto)
1007 error(ERR_PANIC, "intra-segment OUT_REL4ADR");
1008 if (segment != NO_SEG && segment % 2) {
1009 error(ERR_NONFATAL, "ELF format does not support"
1010 " segment base references");
1011 } else {
1012 if (wrt == NO_SEG) {
1013 elf_add_reloc(s, segment, R_386_PC32);
1014 } else if (wrt == elf_plt_sect + 1) {
1015 elf_add_reloc(s, segment, R_386_PLT32);
1016 } else if (wrt == elf_gotpc_sect + 1 ||
1017 wrt == elf_gotoff_sect + 1 ||
1018 wrt == elf_got_sect + 1) {
1019 error(ERR_NONFATAL, "ELF format cannot produce PC-"
1020 "relative GOT references");
1021 } else {
1022 error(ERR_NONFATAL, "ELF format does not support this"
1023 " use of WRT");
1024 wrt = NO_SEG; /* we can at least _try_ to continue */
1025 }
1026 }
1027 p = mydata;
1028 WRITELONG(p, *(int64_t *)data - size);
1029 elf_sect_write(s, mydata, 4L);
1030 }
1031 }
1032
1033 static void elf_write(void)
1034 {
1035 int align;
1036 int scount;
1037 char *p;
1038 int commlen;
1039 char comment[64];
1040 int i;
1041
1042 struct SAA *symtab;
1043 int32_t symtablen, symtablocal;
1044
1045 /*
1046 * Work out how many sections we will have. We have SHN_UNDEF,
1047 * then the flexible user sections, then the four fixed
1048 * sections `.comment', `.shstrtab', `.symtab' and `.strtab',
1049 * then optionally relocation sections for the user sections.
1050 */
1051 if (of_elf32.current_dfmt == &df_stabs)
1052 nsections = 8;
1053 else if (of_elf32.current_dfmt == &df_dwarf)
1054 nsections = 15;
1055 else
1056 nsections = 5; /* SHN_UNDEF and the fixed ones */
1057
1058 add_sectname("", ".comment");
1059 add_sectname("", ".shstrtab");
1060 add_sectname("", ".symtab");
1061 add_sectname("", ".strtab");
1062 for (i = 0; i < nsects; i++) {
1063 nsections++; /* for the section itself */
1064 if (sects[i]->head) {
1065 nsections++; /* for its relocations */
1066 add_sectname(".rel", sects[i]->name);
1067 }
1068 }
1069
1070 if (of_elf32.current_dfmt == &df_stabs) {
1071 /* in case the debug information is wanted, just add these three sections... */
1072 add_sectname("", ".stab");
1073 add_sectname("", ".stabstr");
1074 add_sectname(".rel", ".stab");
1075 }
1076
1077 else if (of_elf32.current_dfmt == &df_dwarf) {
1078 /* the dwarf debug standard specifies the following ten sections,
1079 not all of which are currently implemented,
1080 although all of them are defined. */
1081 #define debug_aranges (int32_t) (nsections-10)
1082 #define debug_info (int32_t) (nsections-7)
1083 #define debug_abbrev (int32_t) (nsections-5)
1084 #define debug_line (int32_t) (nsections-4)
1085 add_sectname("", ".debug_aranges");
1086 add_sectname(".rela", ".debug_aranges");
1087 add_sectname("", ".debug_pubnames");
1088 add_sectname("", ".debug_info");
1089 add_sectname(".rela", ".debug_info");
1090 add_sectname("", ".debug_abbrev");
1091 add_sectname("", ".debug_line");
1092 add_sectname(".rela", ".debug_line");
1093 add_sectname("", ".debug_frame");
1094 add_sectname("", ".debug_loc");
1095 }
1096
1097 /*
1098 * Do the comment.
1099 */
1100 *comment = '\0';
1101 commlen = 2 + snprintf(comment+1, sizeof comment-1, "%s", nasm_comment);
1102
1103 /*
1104 * Output the ELF header.
1105 */
1106 fwrite("\177ELF\1\1\1", 7, 1, elffp);
1107 fputc(elf_osabi, elffp);
1108 fputc(elf_abiver, elffp);
1109 fwritezero(7, elffp);
1110 fwriteint16_t(1, elffp); /* ET_REL relocatable file */
1111 fwriteint16_t(3, elffp); /* EM_386 processor ID */
1112 fwriteint32_t(1L, elffp); /* EV_CURRENT file format version */
1113 fwriteint32_t(0L, elffp); /* no entry point */
1114 fwriteint32_t(0L, elffp); /* no program header table */
1115 fwriteint32_t(0x40L, elffp); /* section headers straight after
1116 * ELF header plus alignment */
1117 fwriteint32_t(0L, elffp); /* 386 defines no special flags */
1118 fwriteint16_t(0x34, elffp); /* size of ELF header */
1119 fwriteint16_t(0, elffp); /* no program header table, again */
1120 fwriteint16_t(0, elffp); /* still no program header table */
1121 fwriteint16_t(0x28, elffp); /* size of section header */
1122 fwriteint16_t(nsections, elffp); /* number of sections */
1123 fwriteint16_t(nsects + 2, elffp); /* string table section index for
1124 * section header table */
1125 fwriteint32_t(0L, elffp); /* align to 0x40 bytes */
1126 fwriteint32_t(0L, elffp);
1127 fwriteint32_t(0L, elffp);
1128
1129 /*
1130 * Build the symbol table and relocation tables.
1131 */
1132 symtab = elf_build_symtab(&symtablen, &symtablocal);
1133 for (i = 0; i < nsects; i++)
1134 if (sects[i]->head)
1135 sects[i]->rel = elf_build_reltab(&sects[i]->rellen,
1136 sects[i]->head);
1137
1138 /*
1139 * Now output the section header table.
1140 */
1141
1142 elf_foffs = 0x40 + 0x28 * nsections;
1143 align = ((elf_foffs + SEG_ALIGN_1) & ~SEG_ALIGN_1) - elf_foffs;
1144 elf_foffs += align;
1145 elf_nsect = 0;
1146 elf_sects = nasm_malloc(sizeof(*elf_sects) * nsections);
1147
1148 elf_section_header(0, 0, 0, NULL, false, 0L, 0, 0, 0, 0); /* SHN_UNDEF */
1149 scount = 1; /* needed for the stabs debugging to track the symtable section */
1150 p = shstrtab + 1;
1151 for (i = 0; i < nsects; i++) {
1152 elf_section_header(p - shstrtab, sects[i]->type, sects[i]->flags,
1153 (sects[i]->type == SHT_PROGBITS ?
1154 sects[i]->data : NULL), true,
1155 sects[i]->len, 0, 0, sects[i]->align, 0);
1156 p += strlen(p) + 1;
1157 scount++; /* dito */
1158 }
1159 elf_section_header(p - shstrtab, 1, 0, comment, false, (int32_t)commlen, 0, 0, 1, 0); /* .comment */
1160 scount++; /* dito */
1161 p += strlen(p) + 1;
1162 elf_section_header(p - shstrtab, 3, 0, shstrtab, false, (int32_t)shstrtablen, 0, 0, 1, 0); /* .shstrtab */
1163 scount++; /* dito */
1164 p += strlen(p) + 1;
1165 elf_section_header(p - shstrtab, 2, 0, symtab, true, symtablen, nsects + 4, symtablocal, 4, 16); /* .symtab */
1166 symtabsection = scount; /* now we got the symtab section index in the ELF file */
1167 p += strlen(p) + 1;
1168 elf_section_header(p - shstrtab, 3, 0, strs, true, strslen, 0, 0, 1, 0); /* .strtab */
1169 for (i = 0; i < nsects; i++)
1170 if (sects[i]->head) {
1171 p += strlen(p) + 1;
1172 elf_section_header(p - shstrtab, 9, 0, sects[i]->rel, true,
1173 sects[i]->rellen, nsects + 3, i + 1, 4, 8);
1174 }
1175 if (of_elf32.current_dfmt == &df_stabs) {
1176 /* for debugging information, create the last three sections
1177 which are the .stab , .stabstr and .rel.stab sections respectively */
1178
1179 /* this function call creates the stab sections in memory */
1180 stabs32_generate();
1181
1182 if ((stabbuf) && (stabstrbuf) && (stabrelbuf)) {
1183 p += strlen(p) + 1;
1184 elf_section_header(p - shstrtab, 1, 0, stabbuf, false, stablen,
1185 nsections - 2, 0, 4, 12);
1186
1187 p += strlen(p) + 1;
1188 elf_section_header(p - shstrtab, 3, 0, stabstrbuf, false,
1189 stabstrlen, 0, 0, 4, 0);
1190
1191 p += strlen(p) + 1;
1192 /* link -> symtable info -> section to refer to */
1193 elf_section_header(p - shstrtab, 9, 0, stabrelbuf, false,
1194 stabrellen, symtabsection, nsections - 3, 4,
1195 8);
1196 }
1197 }
1198 else if (of_elf32.current_dfmt == &df_dwarf) {
1199 /* for dwarf debugging information, create the ten dwarf sections */
1200
1201 /* this function call creates the dwarf sections in memory */
1202 if (dwarf_fsect) dwarf32_generate();
1203
1204 p += strlen(p) + 1;
1205 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, arangesbuf, false,
1206 arangeslen, 0, 0, 1, 0);
1207 p += strlen(p) + 1;
1208 elf_section_header(p - shstrtab, SHT_RELA, 0, arangesrelbuf, false,
1209 arangesrellen, symtabsection, debug_aranges, 1, 12);
1210 p += strlen(p) + 1;
1211 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, pubnamesbuf, false,
1212 pubnameslen, 0, 0, 1, 0);
1213 p += strlen(p) + 1;
1214 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, infobuf, false,
1215 infolen, 0, 0, 1, 0);
1216 p += strlen(p) + 1;
1217 elf_section_header(p - shstrtab, SHT_RELA, 0, inforelbuf, false,
1218 inforellen, symtabsection, debug_info, 1, 12);
1219 p += strlen(p) + 1;
1220 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, abbrevbuf, false,
1221 abbrevlen, 0, 0, 1, 0);
1222 p += strlen(p) + 1;
1223 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, linebuf, false,
1224 linelen, 0, 0, 1, 0);
1225 p += strlen(p) + 1;
1226 elf_section_header(p - shstrtab, SHT_RELA, 0, linerelbuf, false,
1227 linerellen, symtabsection, debug_line, 1, 12);
1228 p += strlen(p) + 1;
1229 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, framebuf, false,
1230 framelen, 0, 0, 8, 0);
1231 p += strlen(p) + 1;
1232 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, locbuf, false,
1233 loclen, 0, 0, 1, 0);
1234
1235 }
1236 fwritezero(align, elffp);
1237
1238 /*
1239 * Now output the sections.
1240 */
1241 elf_write_sections();
1242
1243 nasm_free(elf_sects);
1244 saa_free(symtab);
1245 }
1246
1247 static struct SAA *elf_build_symtab(int32_t *len, int32_t *local)
1248 {
1249 struct SAA *s = saa_init(1L);
1250 struct Symbol *sym;
1251 uint8_t entry[16], *p;
1252 int i;
1253
1254 *len = *local = 0;
1255
1256 /*
1257 * First, an all-zeros entry, required by the ELF spec.
1258 */
1259 saa_wbytes(s, NULL, 16L); /* null symbol table entry */
1260 *len += 16;
1261 (*local)++;
1262
1263 /*
1264 * Next, an entry for the file name.
1265 */
1266 p = entry;
1267 WRITELONG(p, 1); /* we know it's 1st entry in strtab */
1268 WRITELONG(p, 0); /* no value */
1269 WRITELONG(p, 0); /* no size either */
1270 WRITESHORT(p, STT_FILE); /* type FILE */
1271 WRITESHORT(p, SHN_ABS);
1272 saa_wbytes(s, entry, 16L);
1273 *len += 16;
1274 (*local)++;
1275
1276 /*
1277 * Now some standard symbols defining the segments, for relocation
1278 * purposes.
1279 */
1280 for (i = 1; i <= nsects; i++) {
1281 p = entry;
1282 WRITELONG(p, 0); /* no symbol name */
1283 WRITELONG(p, 0); /* offset zero */
1284 WRITELONG(p, 0); /* size zero */
1285 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1286 WRITESHORT(p, i); /* section id */
1287 saa_wbytes(s, entry, 16L);
1288 *len += 16;
1289 (*local)++;
1290 }
1291
1292 /*
1293 * Now the other local symbols.
1294 */
1295 saa_rewind(syms);
1296 while ((sym = saa_rstruct(syms))) {
1297 if (sym->type & SYM_GLOBAL)
1298 continue;
1299 p = entry;
1300 WRITELONG(p, sym->strpos);
1301 WRITELONG(p, sym->symv.key);
1302 WRITELONG(p, sym->size);
1303 WRITECHAR(p, sym->type); /* type and binding */
1304 WRITECHAR(p, sym->other); /* visibility */
1305 WRITESHORT(p, sym->section);
1306 saa_wbytes(s, entry, 16L);
1307 *len += 16;
1308 (*local)++;
1309 }
1310 /*
1311 * dwarf needs symbols for debug sections
1312 * which are relocation targets.
1313 */
1314 //*** fix for 32 bit
1315 if (of_elf32.current_dfmt == &df_dwarf) {
1316 dwarf_infosym = *local;
1317 p = entry;
1318 WRITELONG(p, 0); /* no symbol name */
1319 WRITELONG(p, (uint32_t) 0); /* offset zero */
1320 WRITELONG(p, (uint32_t) 0); /* size zero */
1321 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1322 WRITESHORT(p, debug_info); /* section id */
1323 saa_wbytes(s, entry, 16L);
1324 *len += 16;
1325 (*local)++;
1326 dwarf_abbrevsym = *local;
1327 p = entry;
1328 WRITELONG(p, 0); /* no symbol name */
1329 WRITELONG(p, (uint32_t) 0); /* offset zero */
1330 WRITELONG(p, (uint32_t) 0); /* size zero */
1331 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1332 WRITESHORT(p, debug_abbrev); /* section id */
1333 saa_wbytes(s, entry, 16L);
1334 *len += 16;
1335 (*local)++;
1336 dwarf_linesym = *local;
1337 p = entry;
1338 WRITELONG(p, 0); /* no symbol name */
1339 WRITELONG(p, (uint32_t) 0); /* offset zero */
1340 WRITELONG(p, (uint32_t) 0); /* size zero */
1341 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1342 WRITESHORT(p, debug_line); /* section id */
1343 saa_wbytes(s, entry, 16L);
1344 *len += 16;
1345 (*local)++;
1346 }
1347
1348 /*
1349 * Now the global symbols.
1350 */
1351 saa_rewind(syms);
1352 while ((sym = saa_rstruct(syms))) {
1353 if (!(sym->type & SYM_GLOBAL))
1354 continue;
1355 p = entry;
1356 WRITELONG(p, sym->strpos);
1357 WRITELONG(p, sym->symv.key);
1358 WRITELONG(p, sym->size);
1359 WRITECHAR(p, sym->type); /* type and binding */
1360 WRITECHAR(p, sym->other); /* visibility */
1361 WRITESHORT(p, sym->section);
1362 saa_wbytes(s, entry, 16L);
1363 *len += 16;
1364 }
1365
1366 return s;
1367 }
1368
1369 static struct SAA *elf_build_reltab(int32_t *len, struct Reloc *r)
1370 {
1371 struct SAA *s;
1372 uint8_t *p, entry[8];
1373
1374 if (!r)
1375 return NULL;
1376
1377 s = saa_init(1L);
1378 *len = 0;
1379
1380 while (r) {
1381 int32_t sym = r->symbol;
1382
1383 if (sym >= GLOBAL_TEMP_BASE)
1384 {
1385 if (of_elf32.current_dfmt == &df_dwarf)
1386 sym += -GLOBAL_TEMP_BASE + (nsects + 5) + nlocals;
1387 else sym += -GLOBAL_TEMP_BASE + (nsects + 2) + nlocals;
1388 }
1389
1390 p = entry;
1391 WRITELONG(p, r->address);
1392 WRITELONG(p, (sym << 8) + r->type);
1393 saa_wbytes(s, entry, 8L);
1394 *len += 8;
1395
1396 r = r->next;
1397 }
1398
1399 return s;
1400 }
1401
1402 static void elf_section_header(int name, int type, int flags,
1403 void *data, bool is_saa, int32_t datalen,
1404 int link, int info, int align, int eltsize)
1405 {
1406 elf_sects[elf_nsect].data = data;
1407 elf_sects[elf_nsect].len = datalen;
1408 elf_sects[elf_nsect].is_saa = is_saa;
1409 elf_nsect++;
1410
1411 fwriteint32_t((int32_t)name, elffp);
1412 fwriteint32_t((int32_t)type, elffp);
1413 fwriteint32_t((int32_t)flags, elffp);
1414 fwriteint32_t(0L, elffp); /* no address, ever, in object files */
1415 fwriteint32_t(type == 0 ? 0L : elf_foffs, elffp);
1416 fwriteint32_t(datalen, elffp);
1417 if (data)
1418 elf_foffs += (datalen + SEG_ALIGN_1) & ~SEG_ALIGN_1;
1419 fwriteint32_t((int32_t)link, elffp);
1420 fwriteint32_t((int32_t)info, elffp);
1421 fwriteint32_t((int32_t)align, elffp);
1422 fwriteint32_t((int32_t)eltsize, elffp);
1423 }
1424
1425 static void elf_write_sections(void)
1426 {
1427 int i;
1428 for (i = 0; i < elf_nsect; i++)
1429 if (elf_sects[i].data) {
1430 int32_t len = elf_sects[i].len;
1431 int32_t reallen = (len + SEG_ALIGN_1) & ~SEG_ALIGN_1;
1432 int32_t align = reallen - len;
1433 if (elf_sects[i].is_saa)
1434 saa_fpwrite(elf_sects[i].data, elffp);
1435 else
1436 fwrite(elf_sects[i].data, len, 1, elffp);
1437 fwritezero(align, elffp);
1438 }
1439 }
1440
1441 static void elf_sect_write(struct Section *sect,
1442 const uint8_t *data, uint32_t len)
1443 {
1444 saa_wbytes(sect->data, data, len);
1445 sect->len += len;
1446 }
1447
1448 static int32_t elf_segbase(int32_t segment)
1449 {
1450 return segment;
1451 }
1452
1453 static int elf_directive(char *directive, char *value, int pass)
1454 {
1455 bool err;
1456 int64_t n;
1457 char *p;
1458
1459 if (!strcmp(directive, "osabi")) {
1460 if (pass == 2)
1461 return 1; /* ignore in pass 2 */
1462
1463 n = readnum(value, &err);
1464 if (err) {
1465 error(ERR_NONFATAL, "`osabi' directive requires a parameter");
1466 return 1;
1467 }
1468 if (n < 0 || n > 255) {
1469 error(ERR_NONFATAL, "valid osabi numbers are 0 to 255");
1470 return 1;
1471 }
1472 elf_osabi = n;
1473 elf_abiver = 0;
1474
1475 if ((p = strchr(value,',')) == NULL)
1476 return 1;
1477
1478 n = readnum(p+1, &err);
1479 if (err || n < 0 || n > 255) {
1480 error(ERR_NONFATAL, "invalid ABI version number (valid: 0 to 255)");
1481 return 1;
1482 }
1483
1484 elf_abiver = n;
1485 return 1;
1486 }
1487
1488 return 0;
1489 }
1490
1491 static void elf_filename(char *inname, char *outname, efunc error)
1492 {
1493 strcpy(elf_module, inname);
1494 standard_extension(inname, outname, ".o", error);
1495 }
1496
1497 extern macros_t elf_stdmac[];
1498
1499 static int elf_set_info(enum geninfo type, char **val)
1500 {
1501 (void)type;
1502 (void)val;
1503 return 0;
1504 }
1505 static struct dfmt df_dwarf = {
1506 "ELF32 (i386) dwarf debug format for Linux",
1507 "dwarf",
1508 debug32_init,
1509 dwarf32_linenum,
1510 debug32_deflabel,
1511 debug32_directive,
1512 debug32_typevalue,
1513 dwarf32_output,
1514 dwarf32_cleanup
1515 };
1516 static struct dfmt df_stabs = {
1517 "ELF32 (i386) stabs debug format for Linux",
1518 "stabs",
1519 debug32_init,
1520 stabs32_linenum,
1521 debug32_deflabel,
1522 debug32_directive,
1523 debug32_typevalue,
1524 stabs32_output,
1525 stabs32_cleanup
1526 };
1527
1528 struct dfmt *elf32_debugs_arr[3] = { &df_dwarf, &df_stabs, NULL };
1529
1530 struct ofmt of_elf32 = {
1531 "ELF32 (i386) object files (e.g. Linux)",
1532 "elf32",
1533 NULL,
1534 elf32_debugs_arr,
1535 &df_stabs,
1536 elf_stdmac,
1537 elf_init,
1538 elf_set_info,
1539 elf_out,
1540 elf_deflabel,
1541 elf_section_names,
1542 elf_segbase,
1543 elf_directive,
1544 elf_filename,
1545 elf_cleanup
1546 };
1547
1548 struct ofmt of_elf = {
1549 "ELF (short name for ELF32) ",
1550 "elf",
1551 NULL,
1552 elf32_debugs_arr,
1553 &df_stabs,
1554 elf_stdmac,
1555 elf_init_hack,
1556 elf_set_info,
1557 elf_out,
1558 elf_deflabel,
1559 elf_section_names,
1560 elf_segbase,
1561 elf_directive,
1562 elf_filename,
1563 elf_cleanup
1564 };
1565 /* again, the stabs debugging stuff (code) */
1566
1567 void debug32_init(struct ofmt *of, void *id, FILE * fp, efunc error)
1568 {
1569 (void)of;
1570 (void)id;
1571 (void)fp;
1572 (void)error;
1573 }
1574
1575 void stabs32_linenum(const char *filename, int32_t linenumber, int32_t segto)
1576 {
1577 (void)segto;
1578
1579 if (!stabs_filename) {
1580 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1581 strcpy(stabs_filename, filename);
1582 } else {
1583 if (strcmp(stabs_filename, filename)) {
1584 /* yep, a memory leak...this program is one-shot anyway, so who cares...
1585 in fact, this leak comes in quite handy to maintain a list of files
1586 encountered so far in the symbol lines... */
1587
1588 /* why not nasm_free(stabs_filename); we're done with the old one */
1589
1590 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1591 strcpy(stabs_filename, filename);
1592 }
1593 }
1594 debug_immcall = 1;
1595 currentline = linenumber;
1596 }
1597
1598 void debug32_deflabel(char *name, int32_t segment, int64_t offset, int is_global,
1599 char *special)
1600 {
1601 (void)name;
1602 (void)segment;
1603 (void)offset;
1604 (void)is_global;
1605 (void)special;
1606 }
1607
1608 void debug32_directive(const char *directive, const char *params)
1609 {
1610 (void)directive;
1611 (void)params;
1612 }
1613
1614 void debug32_typevalue(int32_t type)
1615 {
1616 int32_t stype, ssize;
1617 switch (TYM_TYPE(type)) {
1618 case TY_LABEL:
1619 ssize = 0;
1620 stype = STT_NOTYPE;
1621 break;
1622 case TY_BYTE:
1623 ssize = 1;
1624 stype = STT_OBJECT;
1625 break;
1626 case TY_WORD:
1627 ssize = 2;
1628 stype = STT_OBJECT;
1629 break;
1630 case TY_DWORD:
1631 ssize = 4;
1632 stype = STT_OBJECT;
1633 break;
1634 case TY_FLOAT:
1635 ssize = 4;
1636 stype = STT_OBJECT;
1637 break;
1638 case TY_QWORD:
1639 ssize = 8;
1640 stype = STT_OBJECT;
1641 break;
1642 case TY_TBYTE:
1643 ssize = 10;
1644 stype = STT_OBJECT;
1645 break;
1646 case TY_OWORD:
1647 ssize = 8;
1648 stype = STT_OBJECT;
1649 break;
1650 case TY_COMMON:
1651 ssize = 0;
1652 stype = STT_COMMON;
1653 break;
1654 case TY_SEG:
1655 ssize = 0;
1656 stype = STT_SECTION;
1657 break;
1658 case TY_EXTERN:
1659 ssize = 0;
1660 stype = STT_NOTYPE;
1661 break;
1662 case TY_EQU:
1663 ssize = 0;
1664 stype = STT_NOTYPE;
1665 break;
1666 default:
1667 ssize = 0;
1668 stype = STT_NOTYPE;
1669 break;
1670 }
1671 if (stype == STT_OBJECT && lastsym && !lastsym->type) {
1672 lastsym->size = ssize;
1673 lastsym->type = stype;
1674 }
1675 }
1676
1677 void stabs32_output(int type, void *param)
1678 {
1679 struct symlininfo *s;
1680 struct linelist *el;
1681 if (type == TY_STABSSYMLIN) {
1682 if (debug_immcall) {
1683 s = (struct symlininfo *)param;
1684 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1685 return; /* we are only interested in the text stuff */
1686 numlinestabs++;
1687 el = (struct linelist *)nasm_malloc(sizeof(struct linelist));
1688 el->info.offset = s->offset;
1689 el->info.section = s->section;
1690 el->info.name = s->name;
1691 el->line = currentline;
1692 el->filename = stabs_filename;
1693 el->next = 0;
1694 if (stabslines) {
1695 stabslines->last->next = el;
1696 stabslines->last = el;
1697 } else {
1698 stabslines = el;
1699 stabslines->last = el;
1700 }
1701 }
1702 }
1703 debug_immcall = 0;
1704 }
1705
1706 #define WRITE_STAB(p,n_strx,n_type,n_other,n_desc,n_value) \
1707 do {\
1708 WRITELONG(p,n_strx); \
1709 WRITECHAR(p,n_type); \
1710 WRITECHAR(p,n_other); \
1711 WRITESHORT(p,n_desc); \
1712 WRITELONG(p,n_value); \
1713 } while (0)
1714
1715 /* for creating the .stab , .stabstr and .rel.stab sections in memory */
1716
1717 void stabs32_generate(void)
1718 {
1719 int i, numfiles, strsize, numstabs = 0, currfile, mainfileindex;
1720 uint8_t *sbuf, *ssbuf, *rbuf, *sptr, *rptr;
1721 char **allfiles;
1722 int *fileidx;
1723
1724 struct linelist *ptr;
1725
1726 ptr = stabslines;
1727
1728 allfiles = (char **)nasm_malloc(numlinestabs * sizeof(char *));
1729 for (i = 0; i < numlinestabs; i++)
1730 allfiles[i] = 0;
1731 numfiles = 0;
1732 while (ptr) {
1733 if (numfiles == 0) {
1734 allfiles[0] = ptr->filename;
1735 numfiles++;
1736 } else {
1737 for (i = 0; i < numfiles; i++) {
1738 if (!strcmp(allfiles[i], ptr->filename))
1739 break;
1740 }
1741 if (i >= numfiles) {
1742 allfiles[i] = ptr->filename;
1743 numfiles++;
1744 }
1745 }
1746 ptr = ptr->next;
1747 }
1748 strsize = 1;
1749 fileidx = (int *)nasm_malloc(numfiles * sizeof(int));
1750 for (i = 0; i < numfiles; i++) {
1751 fileidx[i] = strsize;
1752 strsize += strlen(allfiles[i]) + 1;
1753 }
1754 mainfileindex = 0;
1755 for (i = 0; i < numfiles; i++) {
1756 if (!strcmp(allfiles[i], elf_module)) {
1757 mainfileindex = i;
1758 break;
1759 }
1760 }
1761
1762 /* worst case size of the stab buffer would be:
1763 the sourcefiles changes each line, which would mean 1 SOL, 1 SYMLIN per line
1764 */
1765 sbuf =
1766 (uint8_t *)nasm_malloc((numlinestabs * 2 + 3) *
1767 sizeof(struct stabentry));
1768
1769 ssbuf = (uint8_t *)nasm_malloc(strsize);
1770
1771 rbuf = (uint8_t *)nasm_malloc(numlinestabs * 8 * (2 + 3));
1772 rptr = rbuf;
1773
1774 for (i = 0; i < numfiles; i++) {
1775 strcpy((char *)ssbuf + fileidx[i], allfiles[i]);
1776 }
1777 ssbuf[0] = 0;
1778
1779 stabstrlen = strsize; /* set global variable for length of stab strings */
1780
1781 sptr = sbuf;
1782 ptr = stabslines;
1783 numstabs = 0;
1784
1785 if (ptr) {
1786 /* this is the first stab, its strx points to the filename of the
1787 the source-file, the n_desc field should be set to the number
1788 of remaining stabs
1789 */
1790 WRITE_STAB(sptr, fileidx[0], 0, 0, 0, strlen(allfiles[0] + 12));
1791
1792 /* this is the stab for the main source file */
1793 WRITE_STAB(sptr, fileidx[mainfileindex], N_SO, 0, 0, 0);
1794
1795 /* relocation table entry */
1796
1797 /* Since the symbol table has two entries before */
1798 /* the section symbols, the index in the info.section */
1799 /* member must be adjusted by adding 2 */
1800
1801 WRITELONG(rptr, (sptr - sbuf) - 4);
1802 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1803
1804 numstabs++;
1805 currfile = mainfileindex;
1806 }
1807
1808 while (ptr) {
1809 if (strcmp(allfiles[currfile], ptr->filename)) {
1810 /* oops file has changed... */
1811 for (i = 0; i < numfiles; i++)
1812 if (!strcmp(allfiles[i], ptr->filename))
1813 break;
1814 currfile = i;
1815 WRITE_STAB(sptr, fileidx[currfile], N_SOL, 0, 0,
1816 ptr->info.offset);
1817 numstabs++;
1818
1819 /* relocation table entry */
1820 WRITELONG(rptr, (sptr - sbuf) - 4);
1821 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1822 }
1823
1824 WRITE_STAB(sptr, 0, N_SLINE, 0, ptr->line, ptr->info.offset);
1825 numstabs++;
1826
1827 /* relocation table entry */
1828
1829 WRITELONG(rptr, (sptr - sbuf) - 4);
1830 WRITELONG(rptr, ((ptr->info.section + 2) << 8) | R_386_32);
1831
1832 ptr = ptr->next;
1833
1834 }
1835
1836 ((struct stabentry *)sbuf)->n_desc = numstabs;
1837
1838 nasm_free(allfiles);
1839 nasm_free(fileidx);
1840
1841 stablen = (sptr - sbuf);
1842 stabrellen = (rptr - rbuf);
1843 stabrelbuf = rbuf;
1844 stabbuf = sbuf;
1845 stabstrbuf = ssbuf;
1846 }
1847
1848 void stabs32_cleanup(void)
1849 {
1850 struct linelist *ptr, *del;
1851 if (!stabslines)
1852 return;
1853 ptr = stabslines;
1854 while (ptr) {
1855 del = ptr;
1856 ptr = ptr->next;
1857 nasm_free(del);
1858 }
1859 if (stabbuf)
1860 nasm_free(stabbuf);
1861 if (stabrelbuf)
1862 nasm_free(stabrelbuf);
1863 if (stabstrbuf)
1864 nasm_free(stabstrbuf);
1865 }
1866 /* dwarf routines */
1867
1868
1869 void dwarf32_linenum(const char *filename, int32_t linenumber, int32_t segto)
1870 {
1871 (void)segto;
1872 dwarf32_findfile(filename);
1873 debug_immcall = 1;
1874 currentline = linenumber;
1875 }
1876
1877 /* called from elf_out with type == TY_DEBUGSYMLIN */
1878 void dwarf32_output(int type, void *param)
1879 {
1880 int ln, aa, inx, maxln, soc;
1881 struct symlininfo *s;
1882 struct SAA *plinep;
1883
1884 (void)type;
1885
1886 s = (struct symlininfo *)param;
1887 /* line number info is only gathered for executable sections */
1888 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1889 return;
1890 /* Check if section index has changed */
1891 if (!(dwarf_csect && (dwarf_csect->section) == (s->section)))
1892 {
1893 dwarf32_findsect(s->section);
1894 }
1895 /* do nothing unless line or file has changed */
1896 if (debug_immcall)
1897 {
1898 ln = currentline - dwarf_csect->line;
1899 aa = s->offset - dwarf_csect->offset;
1900 inx = dwarf_clist->line;
1901 plinep = dwarf_csect->psaa;
1902 /* check for file change */
1903 if (!(inx == dwarf_csect->file))
1904 {
1905 saa_write8(plinep,DW_LNS_set_file);
1906 saa_write8(plinep,inx);
1907 dwarf_csect->file = inx;
1908 }
1909 /* check for line change */
1910 if (ln)
1911 {
1912 /* test if in range of special op code */
1913 maxln = line_base + line_range;
1914 soc = (ln - line_base) + (line_range * aa) + opcode_base;
1915 if (ln >= line_base && ln < maxln && soc < 256)
1916 {
1917 saa_write8(plinep,soc);
1918 }
1919 else
1920 {
1921 if (ln)
1922 {
1923 saa_write8(plinep,DW_LNS_advance_line);
1924 saa_wleb128s(plinep,ln);
1925 }
1926 if (aa)
1927 {
1928 saa_write8(plinep,DW_LNS_advance_pc);
1929 saa_wleb128u(plinep,aa);
1930 }
1931 }
1932 dwarf_csect->line = currentline;
1933 dwarf_csect->offset = s->offset;
1934 }
1935 /* show change handled */
1936 debug_immcall = 0;
1937 }
1938 }
1939
1940
1941 void dwarf32_generate(void)
1942 {
1943 uint8_t *pbuf;
1944 int indx;
1945 struct linelist *ftentry;
1946 struct SAA *paranges, *ppubnames, *pinfo, *pabbrev, *plines, *plinep;
1947 struct SAA *parangesrel, *plinesrel, *pinforel;
1948 struct sectlist *psect;
1949 size_t saalen, linepoff, totlen, highaddr;
1950
1951 /* write epilogues for each line program range */
1952 /* and build aranges section */
1953 paranges = saa_init(1L);
1954 parangesrel = saa_init(1L);
1955 saa_write16(paranges,2); /* dwarf version */
1956 saa_write32(parangesrel, paranges->datalen+4);
1957 saa_write32(parangesrel, (dwarf_infosym << 8) + R_386_32); /* reloc to info */
1958 saa_write32(parangesrel, 0);
1959 saa_write32(paranges,0); /* offset into info */
1960 saa_write8(paranges,4); /* pointer size */
1961 saa_write8(paranges,0); /* not segmented */
1962 saa_write32(paranges,0); /* padding */
1963 /* iterate though sectlist entries */
1964 psect = dwarf_fsect;
1965 totlen = 0;
1966 highaddr = 0;
1967 for (indx = 0; indx < dwarf_nsections; indx++)
1968 {
1969 plinep = psect->psaa;
1970 /* Line Number Program Epilogue */
1971 saa_write8(plinep,2); /* std op 2 */
1972 saa_write8(plinep,(sects[psect->section]->len)-psect->offset);
1973 saa_write8(plinep,DW_LNS_extended_op);
1974 saa_write8(plinep,1); /* operand length */
1975 saa_write8(plinep,DW_LNE_end_sequence);
1976 totlen += plinep->datalen;
1977 /* range table relocation entry */
1978 saa_write32(parangesrel, paranges->datalen + 4);
1979 saa_write32(parangesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
1980 saa_write32(parangesrel, (uint32_t) 0);
1981 /* range table entry */
1982 saa_write32(paranges,0x0000); /* range start */
1983 saa_write32(paranges,sects[psect->section]->len); /* range length */
1984 highaddr += sects[psect->section]->len;
1985 /* done with this entry */
1986 psect = psect->next;
1987 }
1988 saa_write32(paranges,0); /* null address */
1989 saa_write32(paranges,0); /* null length */
1990 saalen = paranges->datalen;
1991 arangeslen = saalen + 4;
1992 arangesbuf = pbuf = nasm_malloc(arangeslen);
1993 WRITELONG(pbuf,saalen); /* initial length */
1994 saa_rnbytes(paranges, pbuf, saalen);
1995 saa_free(paranges);
1996
1997 /* build rela.aranges section */
1998 arangesrellen = saalen = parangesrel->datalen;
1999 arangesrelbuf = pbuf = nasm_malloc(arangesrellen);
2000 saa_rnbytes(parangesrel, pbuf, saalen);
2001 saa_free(parangesrel);
2002
2003 /* build pubnames section */
2004 ppubnames = saa_init(1L);
2005 saa_write16(ppubnames,3); /* dwarf version */
2006 saa_write32(ppubnames,0); /* offset into info */
2007 saa_write32(ppubnames,0); /* space used in info */
2008 saa_write32(ppubnames,0); /* end of list */
2009 saalen = ppubnames->datalen;
2010 pubnameslen = saalen + 4;
2011 pubnamesbuf = pbuf = nasm_malloc(pubnameslen);
2012 WRITELONG(pbuf,saalen); /* initial length */
2013 saa_rnbytes(ppubnames, pbuf, saalen);
2014 saa_free(ppubnames);
2015
2016 /* build info section */
2017 pinfo = saa_init(1L);
2018 pinforel = saa_init(1L);
2019 saa_write16(pinfo,2); /* dwarf version */
2020 saa_write32(pinforel, pinfo->datalen + 4);
2021 saa_write32(pinforel, (dwarf_abbrevsym << 8) + R_386_32); /* reloc to abbrev */
2022 saa_write32(pinforel, 0);
2023 saa_write32(pinfo,0); /* offset into abbrev */
2024 saa_write8(pinfo,4); /* pointer size */
2025 saa_write8(pinfo,1); /* abbrviation number LEB128u */
2026 saa_write32(pinforel, pinfo->datalen + 4);
2027 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
2028 saa_write32(pinforel, 0);
2029 saa_write32(pinfo,0); /* DW_AT_low_pc */
2030 saa_write32(pinforel, pinfo->datalen + 4);
2031 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
2032 saa_write32(pinforel, 0);
2033 saa_write32(pinfo,highaddr); /* DW_AT_high_pc */
2034 saa_write32(pinforel, pinfo->datalen + 4);
2035 saa_write32(pinforel, (dwarf_linesym << 8) + R_386_32); /* reloc to line */
2036 saa_write32(pinforel, 0);
2037 saa_write32(pinfo,0); /* DW_AT_stmt_list */
2038 saa_wbytes(pinfo, elf_module, strlen(elf_module)+1);
2039 saa_wbytes(pinfo, nasm_signature, strlen(nasm_signature)+1);
2040 saa_write16(pinfo,DW_LANG_Mips_Assembler);
2041 saa_write8(pinfo,2); /* abbrviation number LEB128u */
2042 saa_write32(pinforel, pinfo->datalen + 4);
2043 saa_write32(pinforel, ((dwarf_fsect->section + 2) << 8) + R_386_32);
2044 saa_write32(pinforel, 0);
2045 saa_write32(pinfo,0); /* DW_AT_low_pc */
2046 saa_write32(pinfo,0); /* DW_AT_frame_base */
2047 saa_write8(pinfo,0); /* end of entries */
2048 saalen = pinfo->datalen;
2049 infolen = saalen + 4;
2050 infobuf = pbuf = nasm_malloc(infolen);
2051 WRITELONG(pbuf,saalen); /* initial length */
2052 saa_rnbytes(pinfo, pbuf, saalen);
2053 saa_free(pinfo);
2054
2055 /* build rela.info section */
2056 inforellen = saalen = pinforel->datalen;
2057 inforelbuf = pbuf = nasm_malloc(inforellen);
2058 saa_rnbytes(pinforel, pbuf, saalen);
2059 saa_free(pinforel);
2060
2061 /* build abbrev section */
2062 pabbrev = saa_init(1L);
2063 saa_write8(pabbrev,1); /* entry number LEB128u */
2064 saa_write8(pabbrev,DW_TAG_compile_unit); /* tag LEB128u */
2065 saa_write8(pabbrev,1); /* has children */
2066 /* the following attributes and forms are all LEB128u values */
2067 saa_write8(pabbrev,DW_AT_low_pc);
2068 saa_write8(pabbrev,DW_FORM_addr);
2069 saa_write8(pabbrev,DW_AT_high_pc);
2070 saa_write8(pabbrev,DW_FORM_addr);
2071 saa_write8(pabbrev,DW_AT_stmt_list);
2072 saa_write8(pabbrev,DW_FORM_data4);
2073 saa_write8(pabbrev,DW_AT_name);
2074 saa_write8(pabbrev,DW_FORM_string);
2075 saa_write8(pabbrev,DW_AT_producer);
2076 saa_write8(pabbrev,DW_FORM_string);
2077 saa_write8(pabbrev,DW_AT_language);
2078 saa_write8(pabbrev,DW_FORM_data2);
2079 saa_write16(pabbrev,0); /* end of entry */
2080 /* LEB128u usage same as above */
2081 saa_write8(pabbrev,2); /* entry number */
2082 saa_write8(pabbrev,DW_TAG_subprogram);
2083 saa_write8(pabbrev,0); /* no children */
2084 saa_write8(pabbrev,DW_AT_low_pc);
2085 saa_write8(pabbrev,DW_FORM_addr);
2086 saa_write8(pabbrev,DW_AT_frame_base);
2087 saa_write8(pabbrev,DW_FORM_data4);
2088 saa_write16(pabbrev,0); /* end of entry */
2089 abbrevlen = saalen = pabbrev->datalen;
2090 abbrevbuf = pbuf = nasm_malloc(saalen);
2091 saa_rnbytes(pabbrev, pbuf, saalen);
2092 saa_free(pabbrev);
2093
2094 /* build line section */
2095 /* prolog */
2096 plines = saa_init(1L);
2097 saa_write8(plines,1); /* Minimum Instruction Length */
2098 saa_write8(plines,1); /* Initial value of 'is_stmt' */
2099 saa_write8(plines,line_base); /* Line Base */
2100 saa_write8(plines,line_range); /* Line Range */
2101 saa_write8(plines,opcode_base); /* Opcode Base */
2102 /* standard opcode lengths (# of LEB128u operands) */
2103 saa_write8(plines,0); /* Std opcode 1 length */
2104 saa_write8(plines,1); /* Std opcode 2 length */
2105 saa_write8(plines,1); /* Std opcode 3 length */
2106 saa_write8(plines,1); /* Std opcode 4 length */
2107 saa_write8(plines,1); /* Std opcode 5 length */
2108 saa_write8(plines,0); /* Std opcode 6 length */
2109 saa_write8(plines,0); /* Std opcode 7 length */
2110 saa_write8(plines,0); /* Std opcode 8 length */
2111 saa_write8(plines,1); /* Std opcode 9 length */
2112 saa_write8(plines,0); /* Std opcode 10 length */
2113 saa_write8(plines,0); /* Std opcode 11 length */
2114 saa_write8(plines,1); /* Std opcode 12 length */
2115 /* Directory Table */
2116 saa_write8(plines,0); /* End of table */
2117 /* File Name Table */
2118 ftentry = dwarf_flist;
2119 for (indx = 0;indx<dwarf_numfiles;indx++)
2120 {
2121 saa_wbytes(plines, ftentry->filename, (int32_t)(strlen(ftentry->filename) + 1));
2122 saa_write8(plines,0); /* directory LEB128u */
2123 saa_write8(plines,0); /* time LEB128u */
2124 saa_write8(plines,0); /* size LEB128u */
2125 ftentry = ftentry->next;
2126 }
2127 saa_write8(plines,0); /* End of table */
2128 linepoff = plines->datalen;
2129 linelen = linepoff + totlen + 10;
2130 linebuf = pbuf = nasm_malloc(linelen);
2131 WRITELONG(pbuf,linelen-4); /* initial length */
2132 WRITESHORT(pbuf,3); /* dwarf version */
2133 WRITELONG(pbuf,linepoff); /* offset to line number program */
2134 /* write line header */
2135 saalen = linepoff;
2136 saa_rnbytes(plines, pbuf, saalen); /* read a given no. of bytes */
2137 pbuf += linepoff;
2138 saa_free(plines);
2139 /* concatonate line program ranges */
2140 linepoff += 13;
2141 plinesrel = saa_init(1L);
2142 psect = dwarf_fsect;
2143 for (indx = 0; indx < dwarf_nsections; indx++)
2144 {
2145 saa_write32(plinesrel, linepoff);
2146 saa_write32(plinesrel, ((uint32_t) (psect->section + 2) << 8) + R_386_32);
2147 saa_write32(plinesrel, (uint32_t) 0);
2148 plinep = psect->psaa;
2149 saalen = plinep->datalen;
2150 saa_rnbytes(plinep, pbuf, saalen);
2151 pbuf += saalen;
2152 linepoff += saalen;
2153 saa_free(plinep);
2154 /* done with this entry */
2155 psect = psect->next;
2156 }
2157
2158
2159 /* build rela.lines section */
2160 linerellen =saalen = plinesrel->datalen;
2161 linerelbuf = pbuf = nasm_malloc(linerellen);
2162 saa_rnbytes(plinesrel, pbuf, saalen);
2163 saa_free(plinesrel);
2164
2165 /* build frame section */
2166 framelen = 4;
2167 framebuf = pbuf = nasm_malloc(framelen);
2168 WRITELONG(pbuf,framelen-4); /* initial length */
2169
2170 /* build loc section */
2171 loclen = 16;
2172 locbuf = pbuf = nasm_malloc(loclen);
2173 WRITELONG(pbuf,0); /* null beginning offset */
2174 WRITELONG(pbuf,0); /* null ending offset */
2175 }
2176
2177 void dwarf32_cleanup(void)
2178 {
2179 if (arangesbuf)
2180 nasm_free(arangesbuf);
2181 if (arangesrelbuf)
2182 nasm_free(arangesrelbuf);
2183 if (pubnamesbuf)
2184 nasm_free(pubnamesbuf);
2185 if (infobuf)
2186 nasm_free(infobuf);
2187 if (inforelbuf)
2188 nasm_free(inforelbuf);
2189 if (abbrevbuf)
2190 nasm_free(abbrevbuf);
2191 if (linebuf)
2192 nasm_free(linebuf);
2193 if (linerelbuf)
2194 nasm_free(linerelbuf);
2195 if (framebuf)
2196 nasm_free(framebuf);
2197 if (locbuf)
2198 nasm_free(locbuf);
2199 }
2200 void dwarf32_findfile(const char * fname)
2201 {
2202 int finx;
2203 struct linelist *match;
2204
2205 /* return if fname is current file name */
2206 if (dwarf_clist && !(strcmp(fname, dwarf_clist->filename))) return;
2207 /* search for match */
2208 else
2209 {
2210 match = 0;
2211 if (dwarf_flist)
2212 {
2213 match = dwarf_flist;
2214 for (finx = 0; finx < dwarf_numfiles; finx++)
2215 {
2216 if (!(strcmp(fname, match->filename)))
2217 {
2218 dwarf_clist = match;
2219 return;
2220 }
2221 }
2222 }
2223 /* add file name to end of list */
2224 dwarf_clist = (struct linelist *)nasm_malloc(sizeof(struct linelist));
2225 dwarf_numfiles++;
2226 dwarf_clist->line = dwarf_numfiles;
2227 dwarf_clist->filename = nasm_malloc(strlen(fname) + 1);
2228 strcpy(dwarf_clist->filename,fname);
2229 dwarf_clist->next = 0;
2230 /* if first entry */
2231 if (!dwarf_flist)
2232 {
2233 dwarf_flist = dwarf_elist = dwarf_clist;
2234 dwarf_clist->last = 0;
2235 }
2236 /* chain to previous entry */
2237 else
2238 {
2239 dwarf_elist->next = dwarf_clist;
2240 dwarf_elist = dwarf_clist;
2241 }
2242 }
2243 }
2244 /* */
2245 void dwarf32_findsect(const int index)
2246 {
2247 int sinx;
2248 struct sectlist *match;
2249 struct SAA *plinep;
2250 /* return if index is current section index */
2251 if (dwarf_csect && (dwarf_csect->section == index))
2252 {
2253 return;
2254 }
2255 /* search for match */
2256 else
2257 {
2258 match = 0;
2259 if (dwarf_fsect)
2260 {
2261 match = dwarf_fsect;
2262 for (sinx = 0; sinx < dwarf_nsections; sinx++)
2263 {
2264 if ((match->section == index))
2265 {
2266 dwarf_csect = match;
2267 return;
2268 }
2269 match = match->next;
2270 }
2271 }
2272 /* add entry to end of list */
2273 dwarf_csect = (struct sectlist *)nasm_malloc(sizeof(struct sectlist));
2274 dwarf_nsections++;
2275 dwarf_csect->psaa = plinep = saa_init(1L);
2276 dwarf_csect->line = 1;
2277 dwarf_csect->offset = 0;
2278 dwarf_csect->file = 1;
2279 dwarf_csect->section = index;
2280 dwarf_csect->next = 0;
2281 /* set relocatable address at start of line program */
2282 saa_write8(plinep,DW_LNS_extended_op);
2283 saa_write8(plinep,5); /* operand length */
2284 saa_write8(plinep,DW_LNE_set_address);
2285 saa_write32(plinep,0); /* Start Address */
2286 /* if first entry */
2287 if (!dwarf_fsect)
2288 {
2289 dwarf_fsect = dwarf_esect = dwarf_csect;
2290 dwarf_csect->last = 0;
2291 }
2292 /* chain to previous entry */
2293 else
2294 {
2295 dwarf_esect->next = dwarf_csect;
2296 dwarf_esect = dwarf_csect;
2297 }
2298 }
2299 }
2300
2301 #endif /* OF_ELF */
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