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ELF: use rbtree for symbol searches
[nasm/avx512.git] / output / outelf64.c
blob259d7d53a6bee84b49e3dba0e653354cef3c516f
1 /* outelf64.c output routines for the Netwide Assembler to produce
2 * ELF64 (x86_64 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 #include "compiler.h"
10
11 #include <stdio.h>
12 #include <stdlib.h>
13 #include <string.h>
14 #include <ctype.h>
15 #include <inttypes.h>
16
17 #include "nasm.h"
18 #include "nasmlib.h"
19 #include "saa.h"
20 #include "raa.h"
21 #include "stdscan.h"
22 #include "outform.h"
23 #include "outlib.h"
24 #include "rbtree.h"
25
26 /* Definitions in lieu of elf.h */
27 #define SHT_NULL 0 /* Inactive section header */
28 #define SHT_PROGBITS 1 /* Program defined content */
29 #define SHT_RELA 4 /* Relocation entries with addends */
30 #define SHT_NOBITS 8 /* Section requires no space in file */
31 #define SHF_WRITE (1 << 0) /* Writable */
32 #define SHF_ALLOC (1 << 1) /* Occupies memory during execution */
33 #define SHF_EXECINSTR (1 << 2) /* Executable */
34 #define SHF_TLS (1 << 10) /* Section hold thread-local data. */
35 #define SHN_ABS 0xfff1 /* Associated symbol is absolute */
36 #define SHN_COMMON 0xfff2 /* Associated symbol is common */
37 #define R_X86_64_NONE 0 /* No reloc */
38 #define R_X86_64_64 1 /* Direct 64 bit */
39 #define R_X86_64_PC32 2 /* PC relative 32 bit signed */
40 #define R_X86_64_GOT32 3 /* 32 bit GOT entry */
41 #define R_X86_64_PLT32 4 /* 32 bit PLT address */
42 #define R_X86_64_COPY 5 /* Copy symbol at runtime */
43 #define R_X86_64_GLOB_DAT 6 /* Create GOT entry */
44 #define R_X86_64_JUMP_SLOT 7 /* Create PLT entry */
45 #define R_X86_64_RELATIVE 8 /* Adjust by program base */
46 #define R_X86_64_GOTPCREL 9 /* 32 bit signed PC relative
47 offset to GOT */
48 #define R_X86_64_32 10 /* Direct 32 bit zero extended */
49 #define R_X86_64_32S 11 /* Direct 32 bit sign extended */
50 #define R_X86_64_16 12 /* Direct 16 bit zero extended */
51 #define R_X86_64_PC16 13 /* 16 bit sign extended pc relative */
52 #define R_X86_64_8 14 /* Direct 8 bit sign extended */
53 #define R_X86_64_PC8 15 /* 8 bit sign extended pc relative */
54 #define R_X86_64_DTPMOD64 16 /* ID of module containing symbol */
55 #define R_X86_64_DTPOFF64 17 /* Offset in module's TLS block */
56 #define R_X86_64_TPOFF64 18 /* Offset in initial TLS block */
57 #define R_X86_64_TLSGD 19 /* 32 bit signed PC relative offset
58 to two GOT entries for GD symbol */
59 #define R_X86_64_TLSLD 20 /* 32 bit signed PC relative offset
60 to two GOT entries for LD symbol */
61 #define R_X86_64_DTPOFF32 21 /* Offset in TLS block */
62 #define R_X86_64_GOTTPOFF 22 /* 32 bit signed PC relative offset
63 to GOT entry for IE symbol */
64 #define R_X86_64_TPOFF32 23 /* Offset in initial TLS block */
65 #define R_X86_64_PC64 24 /* word64 S + A - P */
66 #define R_X86_64_GOTOFF64 25 /* word64 S + A - GOT */
67 #define R_X86_64_GOTPC32 26 /* word32 GOT + A - P */
68 #define R_X86_64_GOT64 27 /* word64 G + A */
69 #define R_X86_64_GOTPCREL64 28 /* word64 G + GOT - P + A */
70 #define R_X86_64_GOTPC64 29 /* word64 GOT - P + A */
71 #define R_X86_64_GOTPLT64 30 /* word64 G + A */
72 #define R_X86_64_PLTOFF64 31 /* word64 L - GOT + A */
73 #define R_X86_64_SIZE32 32 /* word32 Z + A */
74 #define R_X86_64_SIZE64 33 /* word64 Z + A */
75 #define R_X86_64_GOTPC32_TLSDESC 34 /* word32 */
76 #define R_X86_64_TLSDESC_CALL 35 /* none */
77 #define R_X86_64_TLSDESC 36 /* word64×2 */
78 #define ET_REL 1 /* Relocatable file */
79 #define EM_X86_64 62 /* AMD x86-64 architecture */
80 #define STT_NOTYPE 0 /* Symbol type is unspecified */
81 #define STT_OBJECT 1 /* Symbol is a data object */
82 #define STT_FUNC 2 /* Symbol is a code object */
83 #define STT_SECTION 3 /* Symbol associated with a section */
84 #define STT_FILE 4 /* Symbol's name is file name */
85 #define STT_COMMON 5 /* Symbol is a common data object */
86 #define STT_TLS 6 /* Symbol is thread-local data object*/
87 #define STT_NUM 7 /* Number of defined types. */
88
89 /* Definitions in lieu of dwarf.h */
90 #define DW_TAG_compile_unit 0x11
91 #define DW_TAG_subprogram 0x2e
92 #define DW_AT_name 0x03
93 #define DW_AT_stmt_list 0x10
94 #define DW_AT_low_pc 0x11
95 #define DW_AT_high_pc 0x12
96 #define DW_AT_language 0x13
97 #define DW_AT_producer 0x25
98 #define DW_AT_frame_base 0x40
99 #define DW_FORM_addr 0x01
100 #define DW_FORM_data2 0x05
101 #define DW_FORM_data4 0x06
102 #define DW_FORM_string 0x08
103 #define DW_LNS_extended_op 0
104 #define DW_LNS_advance_pc 2
105 #define DW_LNS_advance_line 3
106 #define DW_LNS_set_file 4
107 #define DW_LNE_end_sequence 1
108 #define DW_LNE_set_address 2
109 #define DW_LNE_define_file 3
110 #define DW_LANG_Mips_Assembler 0x8001
111
112 #define SOC(ln,aa) ln - line_base + (line_range * aa) + opcode_base
113
114 typedef uint32_t Elf64_Word;
115 typedef uint64_t Elf64_Xword;
116 typedef uint64_t Elf64_Addr;
117 typedef uint64_t Elf64_Off;
118 typedef struct
119 {
120 Elf64_Word sh_name; /* Section name (string tbl index) */
121 Elf64_Word sh_type; /* Section type */
122 Elf64_Xword sh_flags; /* Section flags */
123 Elf64_Addr sh_addr; /* Section virtual addr at execution */
124 Elf64_Off sh_offset; /* Section file offset */
125 Elf64_Xword sh_size; /* Section size in bytes */
126 Elf64_Word sh_link; /* Link to another section */
127 Elf64_Word sh_info; /* Additional section information */
128 Elf64_Xword sh_addralign; /* Section alignment */
129 Elf64_Xword sh_entsize; /* Entry size if section holds table */
130 } Elf64_Shdr;
131
132
133 #ifdef OF_ELF64
134
135
136 struct Reloc {
137 struct Reloc *next;
138 int64_t address; /* relative to _start_ of section */
139 int64_t symbol; /* symbol index */
140 int64_t offset; /* symbol addend */
141 int type; /* type of relocation */
142 };
143
144 struct Symbol {
145 struct rbtree symv; /* symbol value and rbtree of globals */
146 int32_t strpos; /* string table position of name */
147 int32_t section; /* section ID of the symbol */
148 int type; /* symbol type */
149 int other; /* symbol visibility */
150 int32_t size; /* size of symbol */
151 int32_t globnum; /* symbol table offset if global */
152 struct Symbol *nextfwd; /* list of unresolved-size symbols */
153 char *name; /* used temporarily if in above list */
154 };
155
156 struct Section {
157 struct SAA *data;
158 uint64_t len, size;
159 uint32_t nrelocs;
160 int32_t index; /* index into sects array */
161 uint32_t type; /* SHT_PROGBITS or SHT_NOBITS */
162 uint64_t align; /* alignment: power of two */
163 uint64_t flags; /* section flags */
164 char *name;
165 struct SAA *rel;
166 uint64_t rellen;
167 struct Reloc *head, **tail;
168 struct rbtree *gsyms; /* global symbols in section */
169 };
170
171 #define SECT_DELTA 32
172 static struct Section **sects;
173 static int nsects, sectlen;
174
175 #define SHSTR_DELTA 256
176 static char *shstrtab;
177 static int shstrtablen, shstrtabsize;
178
179 static struct SAA *syms;
180 static uint32_t nlocals, nglobs;
181
182 static int32_t def_seg;
183
184 static struct RAA *bsym;
185
186 static struct SAA *strs;
187 static uint32_t strslen;
188
189 static FILE *elffp;
190 static efunc error;
191 static evalfunc evaluate;
192
193 static struct Symbol *fwds;
194
195 static char elf_module[FILENAME_MAX];
196
197 static uint8_t elf_osabi = 0; /* Default OSABI = 0 (System V or Linux) */
198 static uint8_t elf_abiver = 0; /* Current ABI version */
199
200 extern struct ofmt of_elf64;
201
202 #define SHN_UNDEF 0
203
204 #define SYM_GLOBAL 0x10
205
206 #define STV_DEFAULT 0
207 #define STV_INTERNAL 1
208 #define STV_HIDDEN 2
209 #define STV_PROTECTED 3
210
211 #define GLOBAL_TEMP_BASE 1048576 /* bigger than any reasonable sym id */
212
213 #define SEG_ALIGN 16 /* alignment of sections in file */
214 #define SEG_ALIGN_1 (SEG_ALIGN-1)
215
216 #define TY_DEBUGSYMLIN 0x40 /* internal call to debug_out */
217
218 static const char align_str[SEG_ALIGN] = ""; /* ANSI will pad this with 0s */
219
220 static struct ELF_SECTDATA {
221 void *data;
222 int64_t len;
223 bool is_saa;
224 } *elf_sects;
225 static int elf_nsect, nsections;
226 static int64_t elf_foffs;
227
228 static void elf_write(void);
229 static void elf_sect_write(struct Section *, const void *, size_t);
230 static void elf_sect_writeaddr(struct Section *, int64_t, size_t);
231 static void elf_section_header(int, int, uint64_t, void *, bool, uint64_t, int, int,
232 int, int);
233 static void elf_write_sections(void);
234 static struct SAA *elf_build_symtab(int32_t *, int32_t *);
235 static struct SAA *elf_build_reltab(uint64_t *, struct Reloc *);
236 static void add_sectname(char *, char *);
237
238 /* type values for stabs debugging sections */
239 #define N_SO 0x64 /* ID for main source file */
240 #define N_SOL 0x84 /* ID for sub-source file */
241 #define N_BINCL 0x82 /* not currently used */
242 #define N_EINCL 0xA2 /* not currently used */
243 #define N_SLINE 0x44
244
245 struct stabentry {
246 uint32_t n_strx;
247 uint8_t n_type;
248 uint8_t n_other;
249 uint16_t n_desc;
250 uint32_t n_value;
251 };
252
253 struct erel {
254 int offset, info;
255 };
256
257 struct symlininfo {
258 int offset;
259 int section; /* index into sects[] */
260 int segto; /* internal section number */
261 char *name; /* shallow-copied pointer of section name */
262 };
263
264 struct linelist {
265 struct symlininfo info;
266 int line;
267 char *filename;
268 struct linelist *next;
269 struct linelist *last;
270 };
271
272 struct sectlist {
273 struct SAA *psaa;
274 int section;
275 int line;
276 int offset;
277 int file;
278 struct sectlist *next;
279 struct sectlist *last;
280 };
281
282 /* common debug variables */
283 static int currentline = 1;
284 static int debug_immcall = 0;
285
286 /* stabs debug variables */
287 static struct linelist *stabslines = 0;
288 static int numlinestabs = 0;
289 static char *stabs_filename = 0;
290 static int symtabsection;
291 static uint8_t *stabbuf = 0, *stabstrbuf = 0, *stabrelbuf = 0;
292 static int stablen, stabstrlen, stabrellen;
293
294 /* dwarf debug variables */
295 static struct linelist *dwarf_flist = 0, *dwarf_clist = 0, *dwarf_elist = 0;
296 static struct sectlist *dwarf_fsect = 0, *dwarf_csect = 0, *dwarf_esect = 0;
297 static int dwarf_numfiles = 0, dwarf_nsections;
298 static uint8_t *arangesbuf = 0, *arangesrelbuf = 0, *pubnamesbuf = 0, *infobuf = 0, *inforelbuf = 0,
299 *abbrevbuf = 0, *linebuf = 0, *linerelbuf = 0, *framebuf = 0, *locbuf = 0;
300 static int8_t line_base = -5, line_range = 14, opcode_base = 13;
301 static int arangeslen, arangesrellen, pubnameslen, infolen, inforellen,
302 abbrevlen, linelen, linerellen, framelen, loclen;
303 static int64_t dwarf_infosym, dwarf_abbrevsym, dwarf_linesym;
304
305
306 static struct dfmt df_dwarf;
307 static struct dfmt df_stabs;
308 static struct Symbol *lastsym;
309
310 /* common debugging routines */
311 void debug64_typevalue(int32_t);
312 void debug64_init(struct ofmt *, void *, FILE *, efunc);
313 void debug64_deflabel(char *, int32_t, int64_t, int, char *);
314 void debug64_directive(const char *, const char *);
315
316 /* stabs debugging routines */
317 void stabs64_linenum(const char *filename, int32_t linenumber, int32_t);
318 void stabs64_output(int, void *);
319 void stabs64_generate(void);
320 void stabs64_cleanup(void);
321
322 /* dwarf debugging routines */
323 void dwarf64_linenum(const char *filename, int32_t linenumber, int32_t);
324 void dwarf64_output(int, void *);
325 void dwarf64_generate(void);
326 void dwarf64_cleanup(void);
327 void dwarf64_findfile(const char *);
328 void dwarf64_findsect(const int);
329
330 /*
331 * Special section numbers which are used to define ELF special
332 * symbols, which can be used with WRT to provide PIC relocation
333 * types.
334 */
335 static int32_t elf_gotpc_sect, elf_gotoff_sect;
336 static int32_t elf_got_sect, elf_plt_sect;
337 static int32_t elf_sym_sect;
338 static int32_t elf_gottpoff_sect;
339
340 static void elf_init(FILE * fp, efunc errfunc, ldfunc ldef, evalfunc eval)
341 {
342 maxbits = 64;
343 elffp = fp;
344 error = errfunc;
345 evaluate = eval;
346 (void)ldef; /* placate optimisers */
347 sects = NULL;
348 nsects = sectlen = 0;
349 syms = saa_init((int32_t)sizeof(struct Symbol));
350 nlocals = nglobs = 0;
351 bsym = raa_init();
352 strs = saa_init(1L);
353 saa_wbytes(strs, "\0", 1L);
354 saa_wbytes(strs, elf_module, (int32_t)(strlen(elf_module) + 1));
355 strslen = 2 + strlen(elf_module);
356 shstrtab = NULL;
357 shstrtablen = shstrtabsize = 0;;
358 add_sectname("", "");
359
360 fwds = NULL;
361
362 elf_gotpc_sect = seg_alloc();
363 ldef("..gotpc", elf_gotpc_sect + 1, 0L, NULL, false, false, &of_elf64,
364 error);
365 elf_gotoff_sect = seg_alloc();
366 ldef("..gotoff", elf_gotoff_sect + 1, 0L, NULL, false, false, &of_elf64,
367 error);
368 elf_got_sect = seg_alloc();
369 ldef("..got", elf_got_sect + 1, 0L, NULL, false, false, &of_elf64,
370 error);
371 elf_plt_sect = seg_alloc();
372 ldef("..plt", elf_plt_sect + 1, 0L, NULL, false, false, &of_elf64,
373 error);
374 elf_sym_sect = seg_alloc();
375 ldef("..sym", elf_sym_sect + 1, 0L, NULL, false, false, &of_elf64,
376 error);
377 elf_gottpoff_sect = seg_alloc();
378 ldef("..gottpoff", elf_gottpoff_sect + 1, 0L, NULL, false, false, &of_elf64,
379 error);
380
381 def_seg = seg_alloc();
382
383 }
384
385 static void elf_cleanup(int debuginfo)
386 {
387 struct Reloc *r;
388 int i;
389
390 (void)debuginfo;
391
392 elf_write();
393 fclose(elffp);
394 for (i = 0; i < nsects; i++) {
395 if (sects[i]->type != SHT_NOBITS)
396 saa_free(sects[i]->data);
397 if (sects[i]->head)
398 saa_free(sects[i]->rel);
399 while (sects[i]->head) {
400 r = sects[i]->head;
401 sects[i]->head = sects[i]->head->next;
402 nasm_free(r);
403 }
404 }
405 nasm_free(sects);
406 saa_free(syms);
407 raa_free(bsym);
408 saa_free(strs);
409 if (of_elf64.current_dfmt) {
410 of_elf64.current_dfmt->cleanup();
411 }
412 }
413 /* add entry to the elf .shstrtab section */
414 static void add_sectname(char *firsthalf, char *secondhalf)
415 {
416 int len = strlen(firsthalf) + strlen(secondhalf);
417 while (shstrtablen + len + 1 > shstrtabsize)
418 shstrtab = nasm_realloc(shstrtab, (shstrtabsize += SHSTR_DELTA));
419 strcpy(shstrtab + shstrtablen, firsthalf);
420 strcat(shstrtab + shstrtablen, secondhalf);
421 shstrtablen += len + 1;
422 }
423
424 static int elf_make_section(char *name, int type, int flags, int align)
425 {
426 struct Section *s;
427
428 s = nasm_malloc(sizeof(*s));
429
430 if (type != SHT_NOBITS)
431 s->data = saa_init(1L);
432 s->head = NULL;
433 s->tail = &s->head;
434 s->len = s->size = 0;
435 s->nrelocs = 0;
436 if (!strcmp(name, ".text"))
437 s->index = def_seg;
438 else
439 s->index = seg_alloc();
440 add_sectname("", name);
441 s->name = nasm_malloc(1 + strlen(name));
442 strcpy(s->name, name);
443 s->type = type;
444 s->flags = flags;
445 s->align = align;
446 s->gsyms = NULL;
447
448 if (nsects >= sectlen)
449 sects =
450 nasm_realloc(sects, (sectlen += SECT_DELTA) * sizeof(*sects));
451 sects[nsects++] = s;
452
453 return nsects - 1;
454 }
455
456 static int32_t elf_section_names(char *name, int pass, int *bits)
457 {
458 char *p;
459 unsigned flags_and, flags_or;
460 uint64_t type, align;
461 int i;
462
463 /*
464 * Default is 64 bits.
465 */
466 if (!name) {
467 *bits = 64;
468 return def_seg;
469 }
470
471 p = name;
472 while (*p && !nasm_isspace(*p))
473 p++;
474 if (*p)
475 *p++ = '\0';
476 flags_and = flags_or = type = align = 0;
477
478 while (*p && nasm_isspace(*p))
479 p++;
480 while (*p) {
481 char *q = p;
482 while (*p && !nasm_isspace(*p))
483 p++;
484 if (*p)
485 *p++ = '\0';
486 while (*p && nasm_isspace(*p))
487 p++;
488
489 if (!nasm_strnicmp(q, "align=", 6)) {
490 align = atoi(q + 6);
491 if (align == 0)
492 align = 1;
493 if ((align - 1) & align) { /* means it's not a power of two */
494 error(ERR_NONFATAL, "section alignment %d is not"
495 " a power of two", align);
496 align = 1;
497 }
498 } else if (!nasm_stricmp(q, "alloc")) {
499 flags_and |= SHF_ALLOC;
500 flags_or |= SHF_ALLOC;
501 } else if (!nasm_stricmp(q, "noalloc")) {
502 flags_and |= SHF_ALLOC;
503 flags_or &= ~SHF_ALLOC;
504 } else if (!nasm_stricmp(q, "exec")) {
505 flags_and |= SHF_EXECINSTR;
506 flags_or |= SHF_EXECINSTR;
507 } else if (!nasm_stricmp(q, "noexec")) {
508 flags_and |= SHF_EXECINSTR;
509 flags_or &= ~SHF_EXECINSTR;
510 } else if (!nasm_stricmp(q, "write")) {
511 flags_and |= SHF_WRITE;
512 flags_or |= SHF_WRITE;
513 } else if (!nasm_stricmp(q, "tls")) {
514 flags_and |= SHF_TLS;
515 flags_or |= SHF_TLS;
516 } else if (!nasm_stricmp(q, "nowrite")) {
517 flags_and |= SHF_WRITE;
518 flags_or &= ~SHF_WRITE;
519 } else if (!nasm_stricmp(q, "progbits")) {
520 type = SHT_PROGBITS;
521 } else if (!nasm_stricmp(q, "nobits")) {
522 type = SHT_NOBITS;
523 }
524 }
525
526 if (!strcmp(name, ".comment") ||
527 !strcmp(name, ".shstrtab") ||
528 !strcmp(name, ".symtab") || !strcmp(name, ".strtab")) {
529 error(ERR_NONFATAL, "attempt to redefine reserved section"
530 "name `%s'", name);
531 return NO_SEG;
532 }
533
534 for (i = 0; i < nsects; i++)
535 if (!strcmp(name, sects[i]->name))
536 break;
537 if (i == nsects) {
538 if (!strcmp(name, ".text"))
539 i = elf_make_section(name, SHT_PROGBITS,
540 SHF_ALLOC | SHF_EXECINSTR, 16);
541 else if (!strcmp(name, ".rodata"))
542 i = elf_make_section(name, SHT_PROGBITS, SHF_ALLOC, 4);
543 else if (!strcmp(name, ".data"))
544 i = elf_make_section(name, SHT_PROGBITS,
545 SHF_ALLOC | SHF_WRITE, 4);
546 else if (!strcmp(name, ".bss"))
547 i = elf_make_section(name, SHT_NOBITS,
548 SHF_ALLOC | SHF_WRITE, 4);
549 else if (!strcmp(name, ".tdata"))
550 i = elf_make_section(name, SHT_PROGBITS,
551 SHF_ALLOC | SHF_WRITE | SHF_TLS, 4);
552 else if (!strcmp(name, ".tbss"))
553 i = elf_make_section(name, SHT_NOBITS,
554 SHF_ALLOC | SHF_WRITE | SHF_TLS, 4);
555 else
556 i = elf_make_section(name, SHT_PROGBITS, SHF_ALLOC, 1);
557 if (type)
558 sects[i]->type = type;
559 if (align)
560 sects[i]->align = align;
561 sects[i]->flags &= ~flags_and;
562 sects[i]->flags |= flags_or;
563 } else if (pass == 1) {
564 if ((type && sects[i]->type != type)
565 || (align && sects[i]->align != align)
566 || (flags_and && ((sects[i]->flags & flags_and) != flags_or)))
567 error(ERR_WARNING, "incompatible section attributes ignored on"
568 " redeclaration of section `%s'", name);
569 }
570
571 return sects[i]->index;
572 }
573
574 static void elf_deflabel(char *name, int32_t segment, int64_t offset,
575 int is_global, char *special)
576 {
577 int pos = strslen;
578 struct Symbol *sym;
579 bool special_used = false;
580
581 #if defined(DEBUG) && DEBUG>2
582 fprintf(stderr,
583 " elf_deflabel: %s, seg=%x, off=%x, is_global=%d, %s\n",
584 name, segment, offset, is_global, special);
585 #endif
586 if (name[0] == '.' && name[1] == '.' && name[2] != '@') {
587 /*
588 * This is a NASM special symbol. We never allow it into
589 * the ELF symbol table, even if it's a valid one. If it
590 * _isn't_ a valid one, we should barf immediately.
591 */
592 if (strcmp(name, "..gotpc") && strcmp(name, "..gotoff") &&
593 strcmp(name, "..got") && strcmp(name, "..plt") &&
594 strcmp(name, "..sym") && strcmp(name, "..gottpoff"))
595 error(ERR_NONFATAL, "unrecognised special symbol `%s'", name);
596 return;
597 }
598
599 if (is_global == 3) {
600 struct Symbol **s;
601 /*
602 * Fix up a forward-reference symbol size from the first
603 * pass.
604 */
605 for (s = &fwds; *s; s = &(*s)->nextfwd)
606 if (!strcmp((*s)->name, name)) {
607 struct tokenval tokval;
608 expr *e;
609 char *p = special;
610
611 while (*p && !nasm_isspace(*p))
612 p++;
613 while (*p && nasm_isspace(*p))
614 p++;
615 stdscan_reset();
616 stdscan_bufptr = p;
617 tokval.t_type = TOKEN_INVALID;
618 e = evaluate(stdscan, NULL, &tokval, NULL, 1, error, NULL);
619 if (e) {
620 if (!is_simple(e))
621 error(ERR_NONFATAL, "cannot use relocatable"
622 " expression as symbol size");
623 else
624 (*s)->size = reloc_value(e);
625 }
626
627 /*
628 * Remove it from the list of unresolved sizes.
629 */
630 nasm_free((*s)->name);
631 *s = (*s)->nextfwd;
632 return;
633 }
634 return; /* it wasn't an important one */
635 }
636
637 saa_wbytes(strs, name, (int32_t)(1 + strlen(name)));
638 strslen += 1 + strlen(name);
639
640 lastsym = sym = saa_wstruct(syms);
641
642 sym->strpos = pos;
643 sym->type = is_global ? SYM_GLOBAL : 0;
644 sym->other = STV_DEFAULT;
645 sym->size = 0;
646 if (segment == NO_SEG)
647 sym->section = SHN_ABS;
648 else {
649 int i;
650 sym->section = SHN_UNDEF;
651 if (nsects == 0 && segment == def_seg) {
652 int tempint;
653 if (segment != elf_section_names(".text", 2, &tempint))
654 error(ERR_PANIC,
655 "strange segment conditions in ELF driver");
656 sym->section = nsects;
657 } else {
658 for (i = 0; i < nsects; i++)
659 if (segment == sects[i]->index) {
660 sym->section = i + 1;
661 break;
662 }
663 }
664 }
665
666 if (is_global == 2) {
667 sym->size = offset;
668 sym->symv.key = 0;
669 sym->section = SHN_COMMON;
670 /*
671 * We have a common variable. Check the special text to see
672 * if it's a valid number and power of two; if so, store it
673 * as the alignment for the common variable.
674 */
675 if (special) {
676 bool err;
677 sym->symv.key = readnum(special, &err);
678 if (err)
679 error(ERR_NONFATAL, "alignment constraint `%s' is not a"
680 " valid number", special);
681 else if ((sym->symv.key | (sym->symv.key - 1))
682 != 2 * sym->symv.key - 1)
683 error(ERR_NONFATAL, "alignment constraint `%s' is not a"
684 " power of two", special);
685 }
686 special_used = true;
687 } else
688 sym->symv.key = (sym->section == SHN_UNDEF ? 0 : offset);
689
690 if (sym->type == SYM_GLOBAL) {
691 /*
692 * If sym->section == SHN_ABS, then the first line of the
693 * else section would cause a core dump, because its a reference
694 * beyond the end of the section array.
695 * This behaviour is exhibited by this code:
696 * GLOBAL crash_nasm
697 * crash_nasm equ 0
698 * To avoid such a crash, such requests are silently discarded.
699 * This may not be the best solution.
700 */
701 if (sym->section == SHN_UNDEF || sym->section == SHN_COMMON) {
702 bsym = raa_write(bsym, segment, nglobs);
703 } else if (sym->section != SHN_ABS) {
704 /*
705 * This is a global symbol; so we must add it to the rbtree
706 * of global symbols in its section.
707 *
708 * In addition, we check the special text for symbol
709 * type and size information.
710 */
711 sects[sym->section-1]->gsyms =
712 rb_insert(sects[sym->section-1]->gsyms, &sym->symv);
713
714 if (special) {
715 int n = strcspn(special, " \t");
716
717 if (!nasm_strnicmp(special, "function", n))
718 sym->type |= STT_FUNC;
719 else if (!nasm_strnicmp(special, "data", n) ||
720 !nasm_strnicmp(special, "object", n))
721 sym->type |= STT_OBJECT;
722 else if (!nasm_strnicmp(special, "notype", n))
723 sym->type |= STT_NOTYPE;
724 else
725 error(ERR_NONFATAL, "unrecognised symbol type `%.*s'",
726 n, special);
727 special += n;
728
729 while (nasm_isspace(*special))
730 ++special;
731 if (*special) {
732 n = strcspn(special, " \t");
733 if (!nasm_strnicmp(special, "default", n))
734 sym->other = STV_DEFAULT;
735 else if (!nasm_strnicmp(special, "internal", n))
736 sym->other = STV_INTERNAL;
737 else if (!nasm_strnicmp(special, "hidden", n))
738 sym->other = STV_HIDDEN;
739 else if (!nasm_strnicmp(special, "protected", n))
740 sym->other = STV_PROTECTED;
741 else
742 n = 0;
743 special += n;
744 }
745
746 if (*special) {
747 struct tokenval tokval;
748 expr *e;
749 int fwd = 0;
750 char *saveme = stdscan_bufptr; /* bugfix? fbk 8/10/00 */
751
752 while (special[n] && nasm_isspace(special[n]))
753 n++;
754 /*
755 * We have a size expression; attempt to
756 * evaluate it.
757 */
758 stdscan_reset();
759 stdscan_bufptr = special + n;
760 tokval.t_type = TOKEN_INVALID;
761 e = evaluate(stdscan, NULL, &tokval, &fwd, 0, error,
762 NULL);
763 if (fwd) {
764 sym->nextfwd = fwds;
765 fwds = sym;
766 sym->name = nasm_strdup(name);
767 } else if (e) {
768 if (!is_simple(e))
769 error(ERR_NONFATAL, "cannot use relocatable"
770 " expression as symbol size");
771 else
772 sym->size = reloc_value(e);
773 }
774 stdscan_bufptr = saveme; /* bugfix? fbk 8/10/00 */
775 }
776 special_used = true;
777 }
778 /*
779 * If TLS segment, mark symbol accordingly.
780 */
781 if (sects[sym->section - 1]->flags & SHF_TLS) {
782 sym->type &= 0xf0;
783 sym->type |= STT_TLS;
784 }
785 }
786 sym->globnum = nglobs;
787 nglobs++;
788 } else
789 nlocals++;
790
791 if (special && !special_used)
792 error(ERR_NONFATAL, "no special symbol features supported here");
793 }
794
795 static void elf_add_reloc(struct Section *sect, int32_t segment,
796 int64_t offset, int type)
797 {
798 struct Reloc *r;
799 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
800 sect->tail = &r->next;
801 r->next = NULL;
802
803 r->address = sect->len;
804 r->offset = offset;
805 if (segment == NO_SEG)
806 r->symbol = 0;
807 else {
808 int i;
809 r->symbol = 0;
810 for (i = 0; i < nsects; i++)
811 if (segment == sects[i]->index)
812 r->symbol = i + 2;
813 if (!r->symbol)
814 r->symbol = GLOBAL_TEMP_BASE + raa_read(bsym, segment);
815 }
816 r->type = type;
817
818 sect->nrelocs++;
819 }
820
821 /*
822 * This routine deals with ..got and ..sym relocations: the more
823 * complicated kinds. In shared-library writing, some relocations
824 * with respect to global symbols must refer to the precise symbol
825 * rather than referring to an offset from the base of the section
826 * _containing_ the symbol. Such relocations call to this routine,
827 * which searches the symbol list for the symbol in question.
828 *
829 * R_386_GOT32 references require the _exact_ symbol address to be
830 * used; R_386_32 references can be at an offset from the symbol.
831 * The boolean argument `exact' tells us this.
832 *
833 * Return value is the adjusted value of `addr', having become an
834 * offset from the symbol rather than the section. Should always be
835 * zero when returning from an exact call.
836 *
837 * Limitation: if you define two symbols at the same place,
838 * confusion will occur.
839 *
840 * Inefficiency: we search, currently, using a linked list which
841 * isn't even necessarily sorted.
842 */
843 static void elf_add_gsym_reloc(struct Section *sect,
844 int32_t segment, uint64_t offset, int64_t pcrel,
845 int type, bool exact)
846 {
847 struct Reloc *r;
848 struct Section *s;
849 struct Symbol *sym;
850 struct rbtree *srb;
851 int i;
852
853 /*
854 * First look up the segment/offset pair and find a global
855 * symbol corresponding to it. If it's not one of our segments,
856 * then it must be an external symbol, in which case we're fine
857 * doing a normal elf_add_reloc after first sanity-checking
858 * that the offset from the symbol is zero.
859 */
860 s = NULL;
861 for (i = 0; i < nsects; i++)
862 if (segment == sects[i]->index) {
863 s = sects[i];
864 break;
865 }
866
867 if (!s) {
868 if (exact && offset)
869 error(ERR_NONFATAL, "invalid access to an external symbol");
870 else
871 elf_add_reloc(sect, segment, offset - pcrel, type);
872 return;
873 }
874
875 srb = rb_search(s->gsyms, offset);
876 if (!srb || (exact && srb->key != offset)) {
877 error(ERR_NONFATAL, "unable to find a suitable global symbol"
878 " for this reference");
879 return;
880 }
881 sym = container_of(srb, struct Symbol, symv);
882
883 r = *sect->tail = nasm_malloc(sizeof(struct Reloc));
884 sect->tail = &r->next;
885 r->next = NULL;
886
887 r->address = sect->len;
888 r->offset = offset - pcrel - sym->symv.key;
889 r->symbol = GLOBAL_TEMP_BASE + sym->globnum;
890 r->type = type;
891
892 sect->nrelocs++;
893 }
894
895 static void elf_out(int32_t segto, const void *data,
896 enum out_type type, uint64_t size,
897 int32_t segment, int32_t wrt)
898 {
899 struct Section *s;
900 int64_t addr, zero;
901 int i;
902 static struct symlininfo sinfo;
903
904 zero = 0;
905
906 #if defined(DEBUG) && DEBUG>2
907 if (data) fprintf(stderr,
908 " elf_out line: %d type: %x seg: %d segto: %d bytes: %x data: %"PRIx64"\n",
909 currentline, type, segment, segto, size, *(int64_t *)data);
910 else fprintf(stderr,
911 " elf_out line: %d type: %x seg: %d segto: %d bytes: %x\n",
912 currentline, type, segment, segto, size);
913 #endif
914
915 /*
916 * handle absolute-assembly (structure definitions)
917 */
918 if (segto == NO_SEG) {
919 if (type != OUT_RESERVE)
920 error(ERR_NONFATAL, "attempt to assemble code in [ABSOLUTE]"
921 " space");
922 return;
923 }
924
925 s = NULL;
926 for (i = 0; i < nsects; i++)
927 if (segto == sects[i]->index) {
928 s = sects[i];
929 break;
930 }
931 if (!s) {
932 int tempint; /* ignored */
933 if (segto != elf_section_names(".text", 2, &tempint))
934 error(ERR_PANIC, "strange segment conditions in ELF driver");
935 else {
936 s = sects[nsects - 1];
937 i = nsects - 1;
938 }
939 }
940 /* invoke current debug_output routine */
941 if (of_elf64.current_dfmt) {
942 sinfo.offset = s->len;
943 sinfo.section = i;
944 sinfo.segto = segto;
945 sinfo.name = s->name;
946 of_elf64.current_dfmt->debug_output(TY_DEBUGSYMLIN, &sinfo);
947 }
948 /* end of debugging stuff */
949
950 if (s->type == SHT_NOBITS && type != OUT_RESERVE) {
951 error(ERR_WARNING, "attempt to initialize memory in"
952 " BSS section `%s': ignored", s->name);
953 s->len += realsize(type, size);
954 return;
955 }
956
957 if (type == OUT_RESERVE) {
958 if (s->type == SHT_PROGBITS) {
959 error(ERR_WARNING, "uninitialized space declared in"
960 " non-BSS section `%s': zeroing", s->name);
961 elf_sect_write(s, NULL, size);
962 } else
963 s->len += size;
964 } else if (type == OUT_RAWDATA) {
965 if (segment != NO_SEG)
966 error(ERR_PANIC, "OUT_RAWDATA with other than NO_SEG");
967 elf_sect_write(s, data, size);
968 } else if (type == OUT_ADDRESS) {
969 addr = *(int64_t *)data;
970 if (segment == NO_SEG) {
971 /* Do nothing */
972 } else if (segment % 2) {
973 error(ERR_NONFATAL, "ELF format does not support"
974 " segment base references");
975 } else {
976 if (wrt == NO_SEG) {
977 switch ((int)size) {
978 case 1:
979 elf_add_reloc(s, segment, addr, R_X86_64_8);
980 break;
981 case 2:
982 elf_add_reloc(s, segment, addr, R_X86_64_16);
983 break;
984 case 4:
985 elf_add_reloc(s, segment, addr, R_X86_64_32);
986 break;
987 case 8:
988 elf_add_reloc(s, segment, addr, R_X86_64_64);
989 break;
990 default:
991 error(ERR_PANIC, "internal error elf64-hpa-871");
992 break;
993 }
994 addr = 0;
995 } else if (wrt == elf_gotpc_sect + 1) {
996 /*
997 * The user will supply GOT relative to $$. ELF
998 * will let us have GOT relative to $. So we
999 * need to fix up the data item by $-$$.
1000 */
1001 addr += s->len;
1002 elf_add_reloc(s, segment, addr, R_X86_64_GOTPC32);
1003 addr = 0;
1004 } else if (wrt == elf_gotoff_sect + 1) {
1005 if (size != 8) {
1006 error(ERR_NONFATAL, "ELF64 requires ..gotoff "
1007 "references to be qword");
1008 } else {
1009 elf_add_reloc(s, segment, addr, R_X86_64_GOTOFF64);
1010 addr = 0;
1011 }
1012 } else if (wrt == elf_got_sect + 1) {
1013 switch ((int)size) {
1014 case 4:
1015 elf_add_gsym_reloc(s, segment, addr, 0,
1016 R_X86_64_GOT32, true);
1017 addr = 0;
1018 break;
1019 case 8:
1020 elf_add_gsym_reloc(s, segment, addr, 0,
1021 R_X86_64_GOT64, true);
1022 addr = 0;
1023 break;
1024 default:
1025 error(ERR_NONFATAL, "invalid ..got reference");
1026 break;
1027 }
1028 } else if (wrt == elf_sym_sect + 1) {
1029 switch ((int)size) {
1030 case 1:
1031 elf_add_gsym_reloc(s, segment, addr, 0,
1032 R_X86_64_8, false);
1033 addr = 0;
1034 break;
1035 case 2:
1036 elf_add_gsym_reloc(s, segment, addr, 0,
1037 R_X86_64_16, false);
1038 addr = 0;
1039 break;
1040 case 4:
1041 elf_add_gsym_reloc(s, segment, addr, 0,
1042 R_X86_64_32, false);
1043 addr = 0;
1044 break;
1045 case 8:
1046 elf_add_gsym_reloc(s, segment, addr, 0,
1047 R_X86_64_64, false);
1048 addr = 0;
1049 break;
1050 default:
1051 error(ERR_PANIC, "internal error elf64-hpa-903");
1052 break;
1053 }
1054 } else if (wrt == elf_plt_sect + 1) {
1055 error(ERR_NONFATAL, "ELF format cannot produce non-PC-"
1056 "relative PLT references");
1057 } else {
1058 error(ERR_NONFATAL, "ELF format does not support this"
1059 " use of WRT");
1060 }
1061 }
1062 elf_sect_writeaddr(s, addr, size);
1063 } else if (type == OUT_REL2ADR) {
1064 addr = *(int64_t *)data - size;
1065 if (segment == segto)
1066 error(ERR_PANIC, "intra-segment OUT_REL2ADR");
1067 if (segment == NO_SEG) {
1068 /* Do nothing */
1069 } else if (segment % 2) {
1070 error(ERR_NONFATAL, "ELF format does not support"
1071 " segment base references");
1072 } else {
1073 if (wrt == NO_SEG) {
1074 elf_add_reloc(s, segment, addr, R_X86_64_PC16);
1075 addr = 0;
1076 } else {
1077 error(ERR_NONFATAL,
1078 "Unsupported non-32-bit ELF relocation [2]");
1079 }
1080 }
1081 elf_sect_writeaddr(s, addr, 2);
1082 } else if (type == OUT_REL4ADR) {
1083 addr = *(int64_t *)data - size;
1084 if (segment == segto)
1085 error(ERR_PANIC, "intra-segment OUT_REL4ADR");
1086 if (segment == NO_SEG) {
1087 /* Do nothing */
1088 } else if (segment % 2) {
1089 error(ERR_NONFATAL, "ELF64 format does not support"
1090 " segment base references");
1091 } else {
1092 if (wrt == NO_SEG) {
1093 elf_add_reloc(s, segment, addr, R_X86_64_PC32);
1094 addr = 0;
1095 } else if (wrt == elf_plt_sect + 1) {
1096 elf_add_gsym_reloc(s, segment, addr+size, size,
1097 R_X86_64_PLT32, true);
1098 addr = 0;
1099 } else if (wrt == elf_gotpc_sect + 1 ||
1100 wrt == elf_got_sect + 1) {
1101 elf_add_gsym_reloc(s, segment, addr+size, size,
1102 R_X86_64_GOTPCREL, true);
1103 addr = 0;
1104 } else if (wrt == elf_gotoff_sect + 1 ||
1105 wrt == elf_got_sect + 1) {
1106 error(ERR_NONFATAL, "ELF64 requires ..gotoff references to be "
1107 "qword absolute");
1108 } else if (wrt == elf_gottpoff_sect + 1) {
1109 elf_add_gsym_reloc(s, segment, addr+size, size,
1110 R_X86_64_GOTTPOFF, true);
1111 addr = 0;
1112 } else {
1113 error(ERR_NONFATAL, "ELF64 format does not support this"
1114 " use of WRT");
1115 }
1116 }
1117 elf_sect_writeaddr(s, addr, 4);
1118 } else if (type == OUT_REL8ADR) {
1119 addr = *(int64_t *)data - size;
1120 if (segment == segto)
1121 error(ERR_PANIC, "intra-segment OUT_REL8ADR");
1122 if (segment == NO_SEG) {
1123 /* Do nothing */
1124 } else if (segment % 2) {
1125 error(ERR_NONFATAL, "ELF64 format does not support"
1126 " segment base references");
1127 } else {
1128 if (wrt == NO_SEG) {
1129 elf_add_reloc(s, segment, addr, R_X86_64_PC64);
1130 addr = 0;
1131 } else if (wrt == elf_gotpc_sect + 1 ||
1132 wrt == elf_got_sect + 1) {
1133 elf_add_gsym_reloc(s, segment, addr+size, size,
1134 R_X86_64_GOTPCREL64, true);
1135 addr = 0;
1136 } else if (wrt == elf_gotoff_sect + 1 ||
1137 wrt == elf_got_sect + 1) {
1138 error(ERR_NONFATAL, "ELF64 requires ..gotoff references to be "
1139 "absolute");
1140 } else if (wrt == elf_gottpoff_sect + 1) {
1141 error(ERR_NONFATAL, "ELF64 requires ..gottpoff references to be "
1142 "dword");
1143 } else {
1144 error(ERR_NONFATAL, "ELF64 format does not support this"
1145 " use of WRT");
1146 }
1147 }
1148 elf_sect_writeaddr(s, addr, 8);
1149 }
1150 }
1151
1152 static void elf_write(void)
1153 {
1154 int align;
1155 int scount;
1156 char *p;
1157 int commlen;
1158 char comment[64];
1159 int i;
1160
1161 struct SAA *symtab;
1162 int32_t symtablen, symtablocal;
1163
1164 /*
1165 * Work out how many sections we will have. We have SHN_UNDEF,
1166 * then the flexible user sections, then the four fixed
1167 * sections `.comment', `.shstrtab', `.symtab' and `.strtab',
1168 * then optionally relocation sections for the user sections.
1169 */
1170 if (of_elf64.current_dfmt == &df_stabs)
1171 nsections = 8;
1172 else if (of_elf64.current_dfmt == &df_dwarf)
1173 nsections = 15;
1174 else
1175 nsections = 5; /* SHN_UNDEF and the fixed ones */
1176
1177 add_sectname("", ".comment");
1178 add_sectname("", ".shstrtab");
1179 add_sectname("", ".symtab");
1180 add_sectname("", ".strtab");
1181 for (i = 0; i < nsects; i++) {
1182 nsections++; /* for the section itself */
1183 if (sects[i]->head) {
1184 nsections++; /* for its relocations */
1185 add_sectname(".rela", sects[i]->name);
1186 }
1187 }
1188
1189 if (of_elf64.current_dfmt == &df_stabs) {
1190 /* in case the debug information is wanted, just add these three sections... */
1191 add_sectname("", ".stab");
1192 add_sectname("", ".stabstr");
1193 add_sectname(".rel", ".stab");
1194 }
1195
1196 else if (of_elf64.current_dfmt == &df_dwarf) {
1197 /* the dwarf debug standard specifies the following ten sections,
1198 not all of which are currently implemented,
1199 although all of them are defined. */
1200 #define debug_aranges (int64_t) (nsections-10)
1201 #define debug_info (int64_t) (nsections-7)
1202 #define debug_abbrev (int64_t) (nsections-5)
1203 #define debug_line (int64_t) (nsections-4)
1204 add_sectname("", ".debug_aranges");
1205 add_sectname(".rela", ".debug_aranges");
1206 add_sectname("", ".debug_pubnames");
1207 add_sectname("", ".debug_info");
1208 add_sectname(".rela", ".debug_info");
1209 add_sectname("", ".debug_abbrev");
1210 add_sectname("", ".debug_line");
1211 add_sectname(".rela", ".debug_line");
1212 add_sectname("", ".debug_frame");
1213 add_sectname("", ".debug_loc");
1214 }
1215
1216 /*
1217 * Do the comment.
1218 */
1219 *comment = '\0';
1220 commlen = 2 + snprintf(comment+1, sizeof comment-1, "%s", nasm_comment);
1221
1222 /*
1223 * Output the ELF header.
1224 */
1225 fwrite("\177ELF\2\1\1", 7, 1, elffp);
1226 fputc(elf_osabi, elffp);
1227 fputc(elf_abiver, elffp);
1228 fwrite("\0\0\0\0\0\0\0", 7, 1, elffp);
1229 fwriteint16_t(ET_REL, elffp); /* relocatable file */
1230 fwriteint16_t(EM_X86_64, elffp); /* processor ID */
1231 fwriteint32_t(1L, elffp); /* EV_CURRENT file format version */
1232 fwriteint64_t(0L, elffp); /* no entry point */
1233 fwriteint64_t(0L, elffp); /* no program header table */
1234 fwriteint64_t(0x40L, elffp); /* section headers straight after
1235 * ELF header plus alignment */
1236 fwriteint32_t(0L, elffp); /* 386 defines no special flags */
1237 fwriteint16_t(0x40, elffp); /* size of ELF header */
1238 fwriteint16_t(0, elffp); /* no program header table, again */
1239 fwriteint16_t(0, elffp); /* still no program header table */
1240 fwriteint16_t(sizeof(Elf64_Shdr), elffp); /* size of section header */
1241 fwriteint16_t(nsections, elffp); /* number of sections */
1242 fwriteint16_t(nsects + 2, elffp); /* string table section index for
1243 * section header table */
1244
1245 /*
1246 * Build the symbol table and relocation tables.
1247 */
1248 symtab = elf_build_symtab(&symtablen, &symtablocal);
1249 for (i = 0; i < nsects; i++)
1250 if (sects[i]->head)
1251 sects[i]->rel = elf_build_reltab(&sects[i]->rellen,
1252 sects[i]->head);
1253
1254 /*
1255 * Now output the section header table.
1256 */
1257
1258 elf_foffs = 0x40 + sizeof(Elf64_Shdr) * nsections;
1259 align = ((elf_foffs + SEG_ALIGN_1) & ~SEG_ALIGN_1) - elf_foffs;
1260 elf_foffs += align;
1261 elf_nsect = 0;
1262 elf_sects = nasm_malloc(sizeof(*elf_sects) * nsections);
1263 elf_section_header(0, 0, 0, NULL, false, 0L, 0, 0, 0, 0); /* SHN_UNDEF */
1264 scount = 1; /* needed for the stabs debugging to track the symtable section */
1265 p = shstrtab + 1;
1266 for (i = 0; i < nsects; i++) {
1267 elf_section_header(p - shstrtab, sects[i]->type, sects[i]->flags,
1268 (sects[i]->type == SHT_PROGBITS ?
1269 sects[i]->data : NULL), true,
1270 sects[i]->len, 0, 0, sects[i]->align, 0);
1271 p += strlen(p) + 1;
1272 scount++; /* ditto */
1273 }
1274 elf_section_header(p - shstrtab, 1, 0, comment, false, (int32_t)commlen, 0, 0, 1, 0); /* .comment */
1275 scount++; /* ditto */
1276 p += strlen(p) + 1;
1277 elf_section_header(p - shstrtab, 3, 0, shstrtab, false, (int32_t)shstrtablen, 0, 0, 1, 0); /* .shstrtab */
1278 scount++; /* ditto */
1279 p += strlen(p) + 1;
1280 elf_section_header(p - shstrtab, 2, 0, symtab, true, symtablen, nsects + 4, symtablocal, 4, 24); /* .symtab */
1281 symtabsection = scount; /* now we got the symtab section index in the ELF file */
1282 p += strlen(p) + 1;
1283 elf_section_header(p - shstrtab, 3, 0, strs, true, strslen, 0, 0, 1, 0); /* .strtab */
1284 for (i = 0; i < nsects; i++)
1285 if (sects[i]->head) {
1286 p += strlen(p) + 1;
1287 elf_section_header(p - shstrtab,SHT_RELA, 0, sects[i]->rel, true,
1288 sects[i]->rellen, nsects + 3, i + 1, 4, 24);
1289 }
1290 if (of_elf64.current_dfmt == &df_stabs) {
1291 /* for debugging information, create the last three sections
1292 which are the .stab , .stabstr and .rel.stab sections respectively */
1293
1294 /* this function call creates the stab sections in memory */
1295 stabs64_generate();
1296
1297 if ((stabbuf) && (stabstrbuf) && (stabrelbuf)) {
1298 p += strlen(p) + 1;
1299 elf_section_header(p - shstrtab, 1, 0, stabbuf, false, stablen,
1300 nsections - 2, 0, 4, 12);
1301
1302 p += strlen(p) + 1;
1303 elf_section_header(p - shstrtab, 3, 0, stabstrbuf, false,
1304 stabstrlen, 0, 0, 4, 0);
1305
1306 p += strlen(p) + 1;
1307 /* link -> symtable info -> section to refer to */
1308 elf_section_header(p - shstrtab, 9, 0, stabrelbuf, false,
1309 stabrellen, symtabsection, nsections - 3, 4,
1310 16);
1311 }
1312 }
1313 else if (of_elf64.current_dfmt == &df_dwarf) {
1314 /* for dwarf debugging information, create the ten dwarf sections */
1315
1316 /* this function call creates the dwarf sections in memory */
1317 if (dwarf_fsect) dwarf64_generate();
1318
1319 p += strlen(p) + 1;
1320 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, arangesbuf, false,
1321 arangeslen, 0, 0, 1, 0);
1322 p += strlen(p) + 1;
1323 elf_section_header(p - shstrtab, SHT_RELA, 0, arangesrelbuf, false,
1324 arangesrellen, symtabsection, debug_aranges, 1, 24);
1325 p += strlen(p) + 1;
1326 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, pubnamesbuf, false,
1327 pubnameslen, 0, 0, 1, 0);
1328 p += strlen(p) + 1;
1329 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, infobuf, false,
1330 infolen, 0, 0, 1, 0);
1331 p += strlen(p) + 1;
1332 elf_section_header(p - shstrtab, SHT_RELA, 0, inforelbuf, false,
1333 inforellen, symtabsection, debug_info, 1, 24);
1334 p += strlen(p) + 1;
1335 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, abbrevbuf, false,
1336 abbrevlen, 0, 0, 1, 0);
1337 p += strlen(p) + 1;
1338 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, linebuf, false,
1339 linelen, 0, 0, 1, 0);
1340 p += strlen(p) + 1;
1341 elf_section_header(p - shstrtab, SHT_RELA, 0, linerelbuf, false,
1342 linerellen, symtabsection, debug_line, 1, 24);
1343 p += strlen(p) + 1;
1344 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, framebuf, false,
1345 framelen, 0, 0, 8, 0);
1346 p += strlen(p) + 1;
1347 elf_section_header(p - shstrtab, SHT_PROGBITS, 0, locbuf, false,
1348 loclen, 0, 0, 1, 0);
1349
1350 }
1351 fwrite(align_str, align, 1, elffp);
1352
1353 /*
1354 * Now output the sections.
1355 */
1356 elf_write_sections();
1357
1358 nasm_free(elf_sects);
1359 saa_free(symtab);
1360 }
1361
1362 static struct SAA *elf_build_symtab(int32_t *len, int32_t *local)
1363 {
1364 struct SAA *s = saa_init(1L);
1365 struct Symbol *sym;
1366 uint8_t entry[24], *p;
1367 int i;
1368
1369 *len = *local = 0;
1370
1371 /*
1372 * First, an all-zeros entry, required by the ELF spec.
1373 */
1374 saa_wbytes(s, NULL, 24L); /* null symbol table entry */
1375 *len += 24;
1376 (*local)++;
1377
1378 /*
1379 * Next, an entry for the file name.
1380 */
1381 p = entry;
1382 WRITELONG(p, 1); /* we know it's 1st entry in strtab */
1383 WRITESHORT(p, STT_FILE); /* type FILE */
1384 WRITESHORT(p, SHN_ABS);
1385 WRITEDLONG(p, (uint64_t) 0); /* no value */
1386 WRITEDLONG(p, (uint64_t) 0); /* no size either */
1387 saa_wbytes(s, entry, 24L);
1388 *len += 24;
1389 (*local)++;
1390
1391 /*
1392 * Now some standard symbols defining the segments, for relocation
1393 * purposes.
1394 */
1395 for (i = 1; i <= nsects; i++) {
1396 p = entry;
1397 WRITELONG(p, 0); /* no symbol name */
1398 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1399 WRITESHORT(p, i); /* section id */
1400 WRITEDLONG(p, (uint64_t) 0); /* offset zero */
1401 WRITEDLONG(p, (uint64_t) 0); /* size zero */
1402 saa_wbytes(s, entry, 24L);
1403 *len += 24;
1404 (*local)++;
1405 }
1406
1407
1408 /*
1409 * Now the other local symbols.
1410 */
1411 saa_rewind(syms);
1412 while ((sym = saa_rstruct(syms))) {
1413 if (sym->type & SYM_GLOBAL)
1414 continue;
1415 p = entry;
1416 WRITELONG(p, sym->strpos); /* index into symbol string table */
1417 WRITECHAR(p, sym->type); /* type and binding */
1418 WRITECHAR(p, sym->other); /* visibility */
1419 WRITESHORT(p, sym->section); /* index into section header table */
1420 WRITEDLONG(p, (int64_t)sym->symv.key); /* value of symbol */
1421 WRITEDLONG(p, (int64_t)sym->size); /* size of symbol */
1422 saa_wbytes(s, entry, 24L);
1423 *len += 24;
1424 (*local)++;
1425 }
1426 /*
1427 * dwarf needs symbols for debug sections
1428 * which are relocation targets.
1429 */
1430 if (of_elf64.current_dfmt == &df_dwarf) {
1431 dwarf_infosym = *local;
1432 p = entry;
1433 WRITELONG(p, 0); /* no symbol name */
1434 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1435 WRITESHORT(p, debug_info); /* section id */
1436 WRITEDLONG(p, (uint64_t) 0); /* offset zero */
1437 WRITEDLONG(p, (uint64_t) 0); /* size zero */
1438 saa_wbytes(s, entry, 24L);
1439 *len += 24;
1440 (*local)++;
1441 dwarf_abbrevsym = *local;
1442 p = entry;
1443 WRITELONG(p, 0); /* no symbol name */
1444 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1445 WRITESHORT(p, debug_abbrev); /* section id */
1446 WRITEDLONG(p, (uint64_t) 0); /* offset zero */
1447 WRITEDLONG(p, (uint64_t) 0); /* size zero */
1448 saa_wbytes(s, entry, 24L);
1449 *len += 24;
1450 (*local)++;
1451 dwarf_linesym = *local;
1452 p = entry;
1453 WRITELONG(p, 0); /* no symbol name */
1454 WRITESHORT(p, STT_SECTION); /* type, binding, and visibility */
1455 WRITESHORT(p, debug_line); /* section id */
1456 WRITEDLONG(p, (uint64_t) 0); /* offset zero */
1457 WRITEDLONG(p, (uint64_t) 0); /* size zero */
1458 saa_wbytes(s, entry, 24L);
1459 *len += 24;
1460 (*local)++;
1461 }
1462
1463 /*
1464 * Now the global symbols.
1465 */
1466 saa_rewind(syms);
1467 while ((sym = saa_rstruct(syms))) {
1468 if (!(sym->type & SYM_GLOBAL))
1469 continue;
1470 p = entry;
1471 WRITELONG(p, sym->strpos);
1472 WRITECHAR(p, sym->type); /* type and binding */
1473 WRITECHAR(p, sym->other); /* visibility */
1474 WRITESHORT(p, sym->section);
1475 WRITEDLONG(p, (int64_t)sym->symv.key);
1476 WRITEDLONG(p, (int64_t)sym->size);
1477 saa_wbytes(s, entry, 24L);
1478 *len += 24;
1479 }
1480
1481 return s;
1482 }
1483
1484 static struct SAA *elf_build_reltab(uint64_t *len, struct Reloc *r)
1485 {
1486 struct SAA *s;
1487 uint8_t *p, entry[24];
1488
1489 if (!r)
1490 return NULL;
1491
1492 s = saa_init(1L);
1493 *len = 0;
1494
1495 while (r) {
1496 int64_t sym = r->symbol;
1497
1498 if (sym >= GLOBAL_TEMP_BASE)
1499 {
1500 if (of_elf64.current_dfmt == &df_dwarf)
1501 sym += -GLOBAL_TEMP_BASE + (nsects + 5) + nlocals;
1502 else sym += -GLOBAL_TEMP_BASE + (nsects + 2) + nlocals;
1503 }
1504 p = entry;
1505 WRITEDLONG(p, r->address);
1506 WRITEDLONG(p, (sym << 32) + r->type);
1507 WRITEDLONG(p, r->offset);
1508 saa_wbytes(s, entry, 24L);
1509 *len += 24;
1510
1511 r = r->next;
1512 }
1513
1514 return s;
1515 }
1516
1517 static void elf_section_header(int name, int type, uint64_t flags,
1518 void *data, bool is_saa, uint64_t datalen,
1519 int link, int info, int align, int eltsize)
1520 {
1521 elf_sects[elf_nsect].data = data;
1522 elf_sects[elf_nsect].len = datalen;
1523 elf_sects[elf_nsect].is_saa = is_saa;
1524 elf_nsect++;
1525
1526 fwriteint32_t((int32_t)name, elffp);
1527 fwriteint32_t((int32_t)type, elffp);
1528 fwriteint64_t((int64_t)flags, elffp);
1529 fwriteint64_t(0L, elffp); /* no address, ever, in object files */
1530 fwriteint64_t(type == 0 ? 0L : elf_foffs, elffp);
1531 fwriteint64_t(datalen, elffp);
1532 if (data)
1533 elf_foffs += (datalen + SEG_ALIGN_1) & ~SEG_ALIGN_1;
1534 fwriteint32_t((int32_t)link, elffp);
1535 fwriteint32_t((int32_t)info, elffp);
1536 fwriteint64_t((int64_t)align, elffp);
1537 fwriteint64_t((int64_t)eltsize, elffp);
1538 }
1539
1540 static void elf_write_sections(void)
1541 {
1542 int i;
1543 for (i = 0; i < elf_nsect; i++)
1544 if (elf_sects[i].data) {
1545 int32_t len = elf_sects[i].len;
1546 int32_t reallen = (len + SEG_ALIGN_1) & ~SEG_ALIGN_1;
1547 int32_t align = reallen - len;
1548 if (elf_sects[i].is_saa)
1549 saa_fpwrite(elf_sects[i].data, elffp);
1550 else
1551 fwrite(elf_sects[i].data, len, 1, elffp);
1552 fwrite(align_str, align, 1, elffp);
1553 }
1554 }
1555
1556 static void elf_sect_write(struct Section *sect, const void *data, size_t len)
1557 {
1558 saa_wbytes(sect->data, data, len);
1559 sect->len += len;
1560 }
1561 static void elf_sect_writeaddr(struct Section *sect, int64_t data, size_t len)
1562 {
1563 saa_writeaddr(sect->data, data, len);
1564 sect->len += len;
1565 }
1566
1567 static int32_t elf_segbase(int32_t segment)
1568 {
1569 return segment;
1570 }
1571
1572 static int elf_directive(char *directive, char *value, int pass)
1573 {
1574 bool err;
1575 int64_t n;
1576 char *p;
1577
1578 if (!strcmp(directive, "osabi")) {
1579 if (pass == 2)
1580 return 1; /* ignore in pass 2 */
1581
1582 n = readnum(value, &err);
1583 if (err) {
1584 error(ERR_NONFATAL, "`osabi' directive requires a parameter");
1585 return 1;
1586 }
1587 if (n < 0 || n > 255) {
1588 error(ERR_NONFATAL, "valid osabi numbers are 0 to 255");
1589 return 1;
1590 }
1591 elf_osabi = n;
1592 elf_abiver = 0;
1593
1594 if ((p = strchr(value,',')) == NULL)
1595 return 1;
1596
1597 n = readnum(p+1, &err);
1598 if (err || n < 0 || n > 255) {
1599 error(ERR_NONFATAL, "invalid ABI version number (valid: 0 to 255)");
1600 return 1;
1601 }
1602
1603 elf_abiver = n;
1604 return 1;
1605 }
1606
1607 return 0;
1608 }
1609
1610 static void elf_filename(char *inname, char *outname, efunc error)
1611 {
1612 strcpy(elf_module, inname);
1613 standard_extension(inname, outname, ".o", error);
1614 }
1615
1616 extern macros_t elf_stdmac[];
1617
1618 static int elf_set_info(enum geninfo type, char **val)
1619 {
1620 (void)type;
1621 (void)val;
1622 return 0;
1623 }
1624 static struct dfmt df_dwarf = {
1625 "ELF64 (X86_64) dwarf debug format for Linux",
1626 "dwarf",
1627 debug64_init,
1628 dwarf64_linenum,
1629 debug64_deflabel,
1630 debug64_directive,
1631 debug64_typevalue,
1632 dwarf64_output,
1633 dwarf64_cleanup
1634 };
1635 static struct dfmt df_stabs = {
1636 "ELF64 (X86_64) stabs debug format for Linux",
1637 "stabs",
1638 debug64_init,
1639 stabs64_linenum,
1640 debug64_deflabel,
1641 debug64_directive,
1642 debug64_typevalue,
1643 stabs64_output,
1644 stabs64_cleanup
1645 };
1646
1647 struct dfmt *elf64_debugs_arr[3] = { &df_dwarf, &df_stabs, NULL };
1648
1649 struct ofmt of_elf64 = {
1650 "ELF64 (x86_64) object files (e.g. Linux)",
1651 "elf64",
1652 NULL,
1653 elf64_debugs_arr,
1654 &df_stabs,
1655 elf_stdmac,
1656 elf_init,
1657 elf_set_info,
1658 elf_out,
1659 elf_deflabel,
1660 elf_section_names,
1661 elf_segbase,
1662 elf_directive,
1663 elf_filename,
1664 elf_cleanup
1665 };
1666
1667 /* common debugging routines */
1668 void debug64_init(struct ofmt *of, void *id, FILE * fp, efunc error)
1669 {
1670 (void)of;
1671 (void)id;
1672 (void)fp;
1673 (void)error;
1674 }
1675 void debug64_deflabel(char *name, int32_t segment, int64_t offset, int is_global,
1676 char *special)
1677 {
1678 (void)name;
1679 (void)segment;
1680 (void)offset;
1681 (void)is_global;
1682 (void)special;
1683 }
1684
1685 void debug64_directive(const char *directive, const char *params)
1686 {
1687 (void)directive;
1688 (void)params;
1689 }
1690
1691 void debug64_typevalue(int32_t type)
1692 {
1693 int32_t stype, ssize;
1694 switch (TYM_TYPE(type)) {
1695 case TY_LABEL:
1696 ssize = 0;
1697 stype = STT_NOTYPE;
1698 break;
1699 case TY_BYTE:
1700 ssize = 1;
1701 stype = STT_OBJECT;
1702 break;
1703 case TY_WORD:
1704 ssize = 2;
1705 stype = STT_OBJECT;
1706 break;
1707 case TY_DWORD:
1708 ssize = 4;
1709 stype = STT_OBJECT;
1710 break;
1711 case TY_FLOAT:
1712 ssize = 4;
1713 stype = STT_OBJECT;
1714 break;
1715 case TY_QWORD:
1716 ssize = 8;
1717 stype = STT_OBJECT;
1718 break;
1719 case TY_TBYTE:
1720 ssize = 10;
1721 stype = STT_OBJECT;
1722 break;
1723 case TY_OWORD:
1724 ssize = 16;
1725 stype = STT_OBJECT;
1726 break;
1727 case TY_COMMON:
1728 ssize = 0;
1729 stype = STT_COMMON;
1730 break;
1731 case TY_SEG:
1732 ssize = 0;
1733 stype = STT_SECTION;
1734 break;
1735 case TY_EXTERN:
1736 ssize = 0;
1737 stype = STT_NOTYPE;
1738 break;
1739 case TY_EQU:
1740 ssize = 0;
1741 stype = STT_NOTYPE;
1742 break;
1743 default:
1744 ssize = 0;
1745 stype = STT_NOTYPE;
1746 break;
1747 }
1748 if (stype == STT_OBJECT && lastsym && !lastsym->type) {
1749 lastsym->size = ssize;
1750 lastsym->type = stype;
1751 }
1752 }
1753
1754 /* stabs debugging routines */
1755
1756
1757 void stabs64_linenum(const char *filename, int32_t linenumber, int32_t segto)
1758 {
1759 (void)segto;
1760 if (!stabs_filename) {
1761 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1762 strcpy(stabs_filename, filename);
1763 } else {
1764 if (strcmp(stabs_filename, filename)) {
1765 /* yep, a memory leak...this program is one-shot anyway, so who cares...
1766 in fact, this leak comes in quite handy to maintain a list of files
1767 encountered so far in the symbol lines... */
1768
1769 /* why not nasm_free(stabs_filename); we're done with the old one */
1770
1771 stabs_filename = (char *)nasm_malloc(strlen(filename) + 1);
1772 strcpy(stabs_filename, filename);
1773 }
1774 }
1775 debug_immcall = 1;
1776 currentline = linenumber;
1777 }
1778
1779
1780 void stabs64_output(int type, void *param)
1781 {
1782 struct symlininfo *s;
1783 struct linelist *el;
1784 if (type == TY_DEBUGSYMLIN) {
1785 if (debug_immcall) {
1786 s = (struct symlininfo *)param;
1787 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1788 return; /* line info is only collected for executable sections */
1789 numlinestabs++;
1790 el = (struct linelist *)nasm_malloc(sizeof(struct linelist));
1791 el->info.offset = s->offset;
1792 el->info.section = s->section;
1793 el->info.name = s->name;
1794 el->line = currentline;
1795 el->filename = stabs_filename;
1796 el->next = 0;
1797 if (stabslines) {
1798 stabslines->last->next = el;
1799 stabslines->last = el;
1800 } else {
1801 stabslines = el;
1802 stabslines->last = el;
1803 }
1804 }
1805 }
1806 debug_immcall = 0;
1807 }
1808
1809 #define WRITE_STAB(p,n_strx,n_type,n_other,n_desc,n_value) \
1810 do {\
1811 WRITELONG(p,n_strx); \
1812 WRITECHAR(p,n_type); \
1813 WRITECHAR(p,n_other); \
1814 WRITESHORT(p,n_desc); \
1815 WRITELONG(p,n_value); \
1816 } while (0)
1817
1818 /* for creating the .stab , .stabstr and .rel.stab sections in memory */
1819
1820 void stabs64_generate(void)
1821 {
1822 int i, numfiles, strsize, numstabs = 0, currfile, mainfileindex;
1823 uint8_t *sbuf, *ssbuf, *rbuf, *sptr, *rptr;
1824 char **allfiles;
1825 int *fileidx;
1826
1827 struct linelist *ptr;
1828
1829 ptr = stabslines;
1830
1831 allfiles = (char **)nasm_malloc(numlinestabs * sizeof(int8_t *));
1832 for (i = 0; i < numlinestabs; i++)
1833 allfiles[i] = 0;
1834 numfiles = 0;
1835 while (ptr) {
1836 if (numfiles == 0) {
1837 allfiles[0] = ptr->filename;
1838 numfiles++;
1839 } else {
1840 for (i = 0; i < numfiles; i++) {
1841 if (!strcmp(allfiles[i], ptr->filename))
1842 break;
1843 }
1844 if (i >= numfiles) {
1845 allfiles[i] = ptr->filename;
1846 numfiles++;
1847 }
1848 }
1849 ptr = ptr->next;
1850 }
1851 strsize = 1;
1852 fileidx = (int *)nasm_malloc(numfiles * sizeof(int));
1853 for (i = 0; i < numfiles; i++) {
1854 fileidx[i] = strsize;
1855 strsize += strlen(allfiles[i]) + 1;
1856 }
1857 mainfileindex = 0;
1858 for (i = 0; i < numfiles; i++) {
1859 if (!strcmp(allfiles[i], elf_module)) {
1860 mainfileindex = i;
1861 break;
1862 }
1863 }
1864
1865 /* worst case size of the stab buffer would be:
1866 the sourcefiles changes each line, which would mean 1 SOL, 1 SYMLIN per line
1867 */
1868 sbuf =
1869 (uint8_t *)nasm_malloc((numlinestabs * 2 + 3) *
1870 sizeof(struct stabentry));
1871
1872 ssbuf = (uint8_t *)nasm_malloc(strsize);
1873
1874 rbuf = (uint8_t *)nasm_malloc(numlinestabs * 16 * (2 + 3));
1875 rptr = rbuf;
1876
1877 for (i = 0; i < numfiles; i++) {
1878 strcpy((char *)ssbuf + fileidx[i], allfiles[i]);
1879 }
1880 ssbuf[0] = 0;
1881
1882 stabstrlen = strsize; /* set global variable for length of stab strings */
1883
1884 sptr = sbuf;
1885 ptr = stabslines;
1886 numstabs = 0;
1887
1888 if (ptr) {
1889 /* this is the first stab, its strx points to the filename of the
1890 the source-file, the n_desc field should be set to the number
1891 of remaining stabs
1892 */
1893 WRITE_STAB(sptr, fileidx[0], 0, 0, 0, strlen(allfiles[0] + 12));
1894
1895 /* this is the stab for the main source file */
1896 WRITE_STAB(sptr, fileidx[mainfileindex], N_SO, 0, 0, 0);
1897
1898 /* relocation table entry */
1899
1900 /* Since the symbol table has two entries before */
1901 /* the section symbols, the index in the info.section */
1902 /* member must be adjusted by adding 2 */
1903
1904 WRITEDLONG(rptr, (int64_t)(sptr - sbuf) - 4);
1905 WRITELONG(rptr, R_X86_64_32);
1906 WRITELONG(rptr, ptr->info.section + 2);
1907
1908 numstabs++;
1909 currfile = mainfileindex;
1910 }
1911
1912 while (ptr) {
1913 if (strcmp(allfiles[currfile], ptr->filename)) {
1914 /* oops file has changed... */
1915 for (i = 0; i < numfiles; i++)
1916 if (!strcmp(allfiles[i], ptr->filename))
1917 break;
1918 currfile = i;
1919 WRITE_STAB(sptr, fileidx[currfile], N_SOL, 0, 0,
1920 ptr->info.offset);
1921 numstabs++;
1922
1923 /* relocation table entry */
1924
1925 WRITEDLONG(rptr, (int64_t)(sptr - sbuf) - 4);
1926 WRITELONG(rptr, R_X86_64_32);
1927 WRITELONG(rptr, ptr->info.section + 2);
1928 }
1929
1930 WRITE_STAB(sptr, 0, N_SLINE, 0, ptr->line, ptr->info.offset);
1931 numstabs++;
1932
1933 /* relocation table entry */
1934
1935 WRITEDLONG(rptr, (int64_t)(sptr - sbuf) - 4);
1936 WRITELONG(rptr, R_X86_64_32);
1937 WRITELONG(rptr, ptr->info.section + 2);
1938
1939 ptr = ptr->next;
1940
1941 }
1942
1943 ((struct stabentry *)sbuf)->n_desc = numstabs;
1944
1945 nasm_free(allfiles);
1946 nasm_free(fileidx);
1947
1948 stablen = (sptr - sbuf);
1949 stabrellen = (rptr - rbuf);
1950 stabrelbuf = rbuf;
1951 stabbuf = sbuf;
1952 stabstrbuf = ssbuf;
1953 }
1954
1955 void stabs64_cleanup(void)
1956 {
1957 struct linelist *ptr, *del;
1958 if (!stabslines)
1959 return;
1960 ptr = stabslines;
1961 while (ptr) {
1962 del = ptr;
1963 ptr = ptr->next;
1964 nasm_free(del);
1965 }
1966 if (stabbuf)
1967 nasm_free(stabbuf);
1968 if (stabrelbuf)
1969 nasm_free(stabrelbuf);
1970 if (stabstrbuf)
1971 nasm_free(stabstrbuf);
1972 }
1973 /* dwarf routines */
1974
1975
1976 void dwarf64_linenum(const char *filename, int32_t linenumber, int32_t segto)
1977 {
1978 (void)segto;
1979 dwarf64_findfile(filename);
1980 debug_immcall = 1;
1981 currentline = linenumber;
1982 }
1983
1984 /* called from elf_out with type == TY_DEBUGSYMLIN */
1985 void dwarf64_output(int type, void *param)
1986 {
1987 int ln, aa, inx, maxln, soc;
1988 struct symlininfo *s;
1989 struct SAA *plinep;
1990
1991 (void)type;
1992
1993 s = (struct symlininfo *)param;
1994 /* line number info is only gathered for executable sections */
1995 if (!(sects[s->section]->flags & SHF_EXECINSTR))
1996 return;
1997 /* Check if section index has changed */
1998 if (!(dwarf_csect && (dwarf_csect->section) == (s->section)))
1999 {
2000 dwarf64_findsect(s->section);
2001 }
2002 /* do nothing unless line or file has changed */
2003 if (debug_immcall)
2004 {
2005 ln = currentline - dwarf_csect->line;
2006 aa = s->offset - dwarf_csect->offset;
2007 inx = dwarf_clist->line;
2008 plinep = dwarf_csect->psaa;
2009 /* check for file change */
2010 if (!(inx == dwarf_csect->file))
2011 {
2012 saa_write8(plinep,DW_LNS_set_file);
2013 saa_write8(plinep,inx);
2014 dwarf_csect->file = inx;
2015 }
2016 /* check for line change */
2017 if (ln)
2018 {
2019 /* test if in range of special op code */
2020 maxln = line_base + line_range;
2021 soc = (ln - line_base) + (line_range * aa) + opcode_base;
2022 if (ln >= line_base && ln < maxln && soc < 256)
2023 {
2024 saa_write8(plinep,soc);
2025 }
2026 else
2027 {
2028 if (ln)
2029 {
2030 saa_write8(plinep,DW_LNS_advance_line);
2031 saa_wleb128s(plinep,ln);
2032 }
2033 if (aa)
2034 {
2035 saa_write8(plinep,DW_LNS_advance_pc);
2036 saa_wleb128u(plinep,aa);
2037 }
2038 }
2039 dwarf_csect->line = currentline;
2040 dwarf_csect->offset = s->offset;
2041 }
2042 /* show change handled */
2043 debug_immcall = 0;
2044 }
2045 }
2046
2047
2048 void dwarf64_generate(void)
2049 {
2050 uint8_t *pbuf;
2051 int indx;
2052 struct linelist *ftentry;
2053 struct SAA *paranges, *ppubnames, *pinfo, *pabbrev, *plines, *plinep;
2054 struct SAA *parangesrel, *plinesrel, *pinforel;
2055 struct sectlist *psect;
2056 size_t saalen, linepoff, totlen, highaddr;
2057
2058 /* write epilogues for each line program range */
2059 /* and build aranges section */
2060 paranges = saa_init(1L);
2061 parangesrel = saa_init(1L);
2062 saa_write16(paranges,3); /* dwarf version */
2063 saa_write64(parangesrel, paranges->datalen+4);
2064 saa_write64(parangesrel, (dwarf_infosym << 32) + R_X86_64_32); /* reloc to info */
2065 saa_write64(parangesrel, 0);
2066 saa_write32(paranges,0); /* offset into info */
2067 saa_write8(paranges,8); /* pointer size */
2068 saa_write8(paranges,0); /* not segmented */
2069 saa_write32(paranges,0); /* padding */
2070 /* iterate though sectlist entries */
2071 psect = dwarf_fsect;
2072 totlen = 0;
2073 highaddr = 0;
2074 for (indx = 0; indx < dwarf_nsections; indx++)
2075 {
2076 plinep = psect->psaa;
2077 /* Line Number Program Epilogue */
2078 saa_write8(plinep,2); /* std op 2 */
2079 saa_write8(plinep,(sects[psect->section]->len)-psect->offset);
2080 saa_write8(plinep,DW_LNS_extended_op);
2081 saa_write8(plinep,1); /* operand length */
2082 saa_write8(plinep,DW_LNE_end_sequence);
2083 totlen += plinep->datalen;
2084 /* range table relocation entry */
2085 saa_write64(parangesrel, paranges->datalen + 4);
2086 saa_write64(parangesrel, ((uint64_t) (psect->section + 2) << 32) + R_X86_64_64);
2087 saa_write64(parangesrel, (uint64_t) 0);
2088 /* range table entry */
2089 saa_write64(paranges,0x0000); /* range start */
2090 saa_write64(paranges,sects[psect->section]->len); /* range length */
2091 highaddr += sects[psect->section]->len;
2092 /* done with this entry */
2093 psect = psect->next;
2094 }
2095 saa_write64(paranges,0); /* null address */
2096 saa_write64(paranges,0); /* null length */
2097 saalen = paranges->datalen;
2098 arangeslen = saalen + 4;
2099 arangesbuf = pbuf = nasm_malloc(arangeslen);
2100 WRITELONG(pbuf,saalen); /* initial length */
2101 saa_rnbytes(paranges, pbuf, saalen);
2102 saa_free(paranges);
2103
2104 /* build rela.aranges section */
2105 arangesrellen = saalen = parangesrel->datalen;
2106 arangesrelbuf = pbuf = nasm_malloc(arangesrellen);
2107 saa_rnbytes(parangesrel, pbuf, saalen);
2108 saa_free(parangesrel);
2109
2110 /* build pubnames section */
2111 ppubnames = saa_init(1L);
2112 saa_write16(ppubnames,3); /* dwarf version */
2113 saa_write32(ppubnames,0); /* offset into info */
2114 saa_write32(ppubnames,0); /* space used in info */
2115 saa_write32(ppubnames,0); /* end of list */
2116 saalen = ppubnames->datalen;
2117 pubnameslen = saalen + 4;
2118 pubnamesbuf = pbuf = nasm_malloc(pubnameslen);
2119 WRITELONG(pbuf,saalen); /* initial length */
2120 saa_rnbytes(ppubnames, pbuf, saalen);
2121 saa_free(ppubnames);
2122
2123 /* build info section */
2124 pinfo = saa_init(1L);
2125 pinforel = saa_init(1L);
2126 saa_write16(pinfo,3); /* dwarf version */
2127 saa_write64(pinforel, pinfo->datalen + 4);
2128 saa_write64(pinforel, (dwarf_abbrevsym << 32) + R_X86_64_32); /* reloc to abbrev */
2129 saa_write64(pinforel, 0);
2130 saa_write32(pinfo,0); /* offset into abbrev */
2131 saa_write8(pinfo,8); /* pointer size */
2132 saa_write8(pinfo,1); /* abbrviation number LEB128u */
2133 saa_write64(pinforel, pinfo->datalen + 4);
2134 saa_write64(pinforel, ((uint64_t)(dwarf_fsect->section + 2) << 32) + R_X86_64_64);
2135 saa_write64(pinforel, 0);
2136 saa_write64(pinfo,0); /* DW_AT_low_pc */
2137 saa_write64(pinforel, pinfo->datalen + 4);
2138 saa_write64(pinforel, ((uint64_t)(dwarf_fsect->section + 2) << 32) + R_X86_64_64);
2139 saa_write64(pinforel, 0);
2140 saa_write64(pinfo,highaddr); /* DW_AT_high_pc */
2141 saa_write64(pinforel, pinfo->datalen + 4);
2142 saa_write64(pinforel, (dwarf_linesym << 32) + R_X86_64_32); /* reloc to line */
2143 saa_write64(pinforel, 0);
2144 saa_write32(pinfo,0); /* DW_AT_stmt_list */
2145 saa_wbytes(pinfo, elf_module, strlen(elf_module)+1);
2146 saa_wbytes(pinfo, nasm_signature, strlen(nasm_signature)+1);
2147 saa_write16(pinfo,DW_LANG_Mips_Assembler);
2148 saa_write8(pinfo,2); /* abbrviation number LEB128u */
2149 saa_write64(pinforel, pinfo->datalen + 4);
2150 saa_write64(pinforel, ((uint64_t)(dwarf_fsect->section + 2) << 32) + R_X86_64_64);
2151 saa_write64(pinforel, 0);
2152 saa_write64(pinfo,0); /* DW_AT_low_pc */
2153 saa_write64(pinfo,0); /* DW_AT_frame_base */
2154 saa_write8(pinfo,0); /* end of entries */
2155 saalen = pinfo->datalen;
2156 infolen = saalen + 4;
2157 infobuf = pbuf = nasm_malloc(infolen);
2158 WRITELONG(pbuf,saalen); /* initial length */
2159 saa_rnbytes(pinfo, pbuf, saalen);
2160 saa_free(pinfo);
2161
2162 /* build rela.info section */
2163 inforellen = saalen = pinforel->datalen;
2164 inforelbuf = pbuf = nasm_malloc(inforellen);
2165 saa_rnbytes(pinforel, pbuf, saalen);
2166 saa_free(pinforel);
2167
2168 /* build abbrev section */
2169 pabbrev = saa_init(1L);
2170 saa_write8(pabbrev,1); /* entry number LEB128u */
2171 saa_write8(pabbrev,DW_TAG_compile_unit); /* tag LEB128u */
2172 saa_write8(pabbrev,1); /* has children */
2173 /* the following attributes and forms are all LEB128u values */
2174 saa_write8(pabbrev,DW_AT_low_pc);
2175 saa_write8(pabbrev,DW_FORM_addr);
2176 saa_write8(pabbrev,DW_AT_high_pc);
2177 saa_write8(pabbrev,DW_FORM_addr);
2178 saa_write8(pabbrev,DW_AT_stmt_list);
2179 saa_write8(pabbrev,DW_FORM_data4);
2180 saa_write8(pabbrev,DW_AT_name);
2181 saa_write8(pabbrev,DW_FORM_string);
2182 saa_write8(pabbrev,DW_AT_producer);
2183 saa_write8(pabbrev,DW_FORM_string);
2184 saa_write8(pabbrev,DW_AT_language);
2185 saa_write8(pabbrev,DW_FORM_data2);
2186 saa_write16(pabbrev,0); /* end of entry */
2187 /* LEB128u usage same as above */
2188 saa_write8(pabbrev,2); /* entry number */
2189 saa_write8(pabbrev,DW_TAG_subprogram);
2190 saa_write8(pabbrev,0); /* no children */
2191 saa_write8(pabbrev,DW_AT_low_pc);
2192 saa_write8(pabbrev,DW_FORM_addr);
2193 saa_write8(pabbrev,DW_AT_frame_base);
2194 saa_write8(pabbrev,DW_FORM_data4);
2195 saa_write16(pabbrev,0); /* end of entry */
2196 abbrevlen = saalen = pabbrev->datalen;
2197 abbrevbuf = pbuf = nasm_malloc(saalen);
2198 saa_rnbytes(pabbrev, pbuf, saalen);
2199 saa_free(pabbrev);
2200
2201 /* build line section */
2202 /* prolog */
2203 plines = saa_init(1L);
2204 saa_write8(plines,1); /* Minimum Instruction Length */
2205 saa_write8(plines,1); /* Initial value of 'is_stmt' */
2206 saa_write8(plines,line_base); /* Line Base */
2207 saa_write8(plines,line_range); /* Line Range */
2208 saa_write8(plines,opcode_base); /* Opcode Base */
2209 /* standard opcode lengths (# of LEB128u operands) */
2210 saa_write8(plines,0); /* Std opcode 1 length */
2211 saa_write8(plines,1); /* Std opcode 2 length */
2212 saa_write8(plines,1); /* Std opcode 3 length */
2213 saa_write8(plines,1); /* Std opcode 4 length */
2214 saa_write8(plines,1); /* Std opcode 5 length */
2215 saa_write8(plines,0); /* Std opcode 6 length */
2216 saa_write8(plines,0); /* Std opcode 7 length */
2217 saa_write8(plines,0); /* Std opcode 8 length */
2218 saa_write8(plines,1); /* Std opcode 9 length */
2219 saa_write8(plines,0); /* Std opcode 10 length */
2220 saa_write8(plines,0); /* Std opcode 11 length */
2221 saa_write8(plines,1); /* Std opcode 12 length */
2222 /* Directory Table */
2223 saa_write8(plines,0); /* End of table */
2224 /* File Name Table */
2225 ftentry = dwarf_flist;
2226 for (indx = 0;indx<dwarf_numfiles;indx++)
2227 {
2228 saa_wbytes(plines, ftentry->filename, (int32_t)(strlen(ftentry->filename) + 1));
2229 saa_write8(plines,0); /* directory LEB128u */
2230 saa_write8(plines,0); /* time LEB128u */
2231 saa_write8(plines,0); /* size LEB128u */
2232 ftentry = ftentry->next;
2233 }
2234 saa_write8(plines,0); /* End of table */
2235 linepoff = plines->datalen;
2236 linelen = linepoff + totlen + 10;
2237 linebuf = pbuf = nasm_malloc(linelen);
2238 WRITELONG(pbuf,linelen-4); /* initial length */
2239 WRITESHORT(pbuf,3); /* dwarf version */
2240 WRITELONG(pbuf,linepoff); /* offset to line number program */
2241 /* write line header */
2242 saalen = linepoff;
2243 saa_rnbytes(plines, pbuf, saalen); /* read a given no. of bytes */
2244 pbuf += linepoff;
2245 saa_free(plines);
2246 /* concatonate line program ranges */
2247 linepoff += 13;
2248 plinesrel = saa_init(1L);
2249 psect = dwarf_fsect;
2250 for (indx = 0; indx < dwarf_nsections; indx++)
2251 {
2252 saa_write64(plinesrel, linepoff);
2253 saa_write64(plinesrel, ((uint64_t) (psect->section + 2) << 32) + R_X86_64_64);
2254 saa_write64(plinesrel, (uint64_t) 0);
2255 plinep = psect->psaa;
2256 saalen = plinep->datalen;
2257 saa_rnbytes(plinep, pbuf, saalen);
2258 pbuf += saalen;
2259 linepoff += saalen;
2260 saa_free(plinep);
2261 /* done with this entry */
2262 psect = psect->next;
2263 }
2264
2265
2266 /* build rela.lines section */
2267 linerellen =saalen = plinesrel->datalen;
2268 linerelbuf = pbuf = nasm_malloc(linerellen);
2269 saa_rnbytes(plinesrel, pbuf, saalen);
2270 saa_free(plinesrel);
2271
2272 /* build frame section */
2273 framelen = 4;
2274 framebuf = pbuf = nasm_malloc(framelen);
2275 WRITELONG(pbuf,framelen-4); /* initial length */
2276
2277 /* build loc section */
2278 loclen = 16;
2279 locbuf = pbuf = nasm_malloc(loclen);
2280 WRITEDLONG(pbuf,0); /* null beginning offset */
2281 WRITEDLONG(pbuf,0); /* null ending offset */
2282 }
2283
2284 void dwarf64_cleanup(void)
2285 {
2286 if (arangesbuf)
2287 nasm_free(arangesbuf);
2288 if (arangesrelbuf)
2289 nasm_free(arangesrelbuf);
2290 if (pubnamesbuf)
2291 nasm_free(pubnamesbuf);
2292 if (infobuf)
2293 nasm_free(infobuf);
2294 if (inforelbuf)
2295 nasm_free(inforelbuf);
2296 if (abbrevbuf)
2297 nasm_free(abbrevbuf);
2298 if (linebuf)
2299 nasm_free(linebuf);
2300 if (linerelbuf)
2301 nasm_free(linerelbuf);
2302 if (framebuf)
2303 nasm_free(framebuf);
2304 if (locbuf)
2305 nasm_free(locbuf);
2306 }
2307 void dwarf64_findfile(const char * fname)
2308 {
2309 int finx;
2310 struct linelist *match;
2311
2312 /* return if fname is current file name */
2313 if (dwarf_clist && !(strcmp(fname, dwarf_clist->filename))) return;
2314 /* search for match */
2315 else
2316 {
2317 match = 0;
2318 if (dwarf_flist)
2319 {
2320 match = dwarf_flist;
2321 for (finx = 0; finx < dwarf_numfiles; finx++)
2322 {
2323 if (!(strcmp(fname, match->filename)))
2324 {
2325 dwarf_clist = match;
2326 return;
2327 }
2328 }
2329 }
2330 /* add file name to end of list */
2331 dwarf_clist = (struct linelist *)nasm_malloc(sizeof(struct linelist));
2332 dwarf_numfiles++;
2333 dwarf_clist->line = dwarf_numfiles;
2334 dwarf_clist->filename = nasm_malloc(strlen(fname) + 1);
2335 strcpy(dwarf_clist->filename,fname);
2336 dwarf_clist->next = 0;
2337 /* if first entry */
2338 if (!dwarf_flist)
2339 {
2340 dwarf_flist = dwarf_elist = dwarf_clist;
2341 dwarf_clist->last = 0;
2342 }
2343 /* chain to previous entry */
2344 else
2345 {
2346 dwarf_elist->next = dwarf_clist;
2347 dwarf_elist = dwarf_clist;
2348 }
2349 }
2350 }
2351 /* */
2352 void dwarf64_findsect(const int index)
2353 {
2354 int sinx;
2355 struct sectlist *match;
2356 struct SAA *plinep;
2357 /* return if index is current section index */
2358 if (dwarf_csect && (dwarf_csect->section == index))
2359 {
2360 return;
2361 }
2362 /* search for match */
2363 else
2364 {
2365 match = 0;
2366 if (dwarf_fsect)
2367 {
2368 match = dwarf_fsect;
2369 for (sinx = 0; sinx < dwarf_nsections; sinx++)
2370 {
2371 if ((match->section == index))
2372 {
2373 dwarf_csect = match;
2374 return;
2375 }
2376 match = match->next;
2377 }
2378 }
2379 /* add entry to end of list */
2380 dwarf_csect = (struct sectlist *)nasm_malloc(sizeof(struct sectlist));
2381 dwarf_nsections++;
2382 dwarf_csect->psaa = plinep = saa_init(1L);
2383 dwarf_csect->line = 1;
2384 dwarf_csect->offset = 0;
2385 dwarf_csect->file = 1;
2386 dwarf_csect->section = index;
2387 dwarf_csect->next = 0;
2388 /* set relocatable address at start of line program */
2389 saa_write8(plinep,DW_LNS_extended_op);
2390 saa_write8(plinep,9); /* operand length */
2391 saa_write8(plinep,DW_LNE_set_address);
2392 saa_write64(plinep,0); /* Start Address */
2393 /* if first entry */
2394 if (!dwarf_fsect)
2395 {
2396 dwarf_fsect = dwarf_esect = dwarf_csect;
2397 dwarf_csect->last = 0;
2398 }
2399 /* chain to previous entry */
2400 else
2401 {
2402 dwarf_esect->next = dwarf_csect;
2403 dwarf_esect = dwarf_csect;
2404 }
2405 }
2406 }
2407
2408 #endif /* OF_ELF */
Adding AVX-512 features