1 /* ----------------------------------------------------------------------- *
3 * Copyright 1996-2013 The NASM Authors - All Rights Reserved
4 * See the file AUTHORS included with the NASM distribution for
5 * the specific copyright holders.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following
11 * * Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * * Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
19 * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
20 * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
21 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
22 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
25 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
26 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
28 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
29 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
30 * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 * ----------------------------------------------------------------------- */
35 * outelf64.c output routines for the Netwide Assembler to produce
36 * ELF64 (x86_64 of course) object file format
53 #include "output/outform.h"
54 #include "output/outlib.h"
57 #include "output/dwarf.h"
58 #include "output/stabs.h"
59 #include "output/outelf.h"
64 static struct elf_section
**sects
;
65 static int nsects
, sectlen
;
67 #define SHSTR_DELTA 256
68 static char *shstrtab
;
69 static int shstrtablen
, shstrtabsize
;
71 static struct SAA
*syms
;
72 static uint32_t nlocals
, nglobs
, ndebugs
; /* Symbol counts */
74 static int32_t def_seg
;
76 static struct RAA
*bsym
;
78 static struct SAA
*strs
;
79 static uint32_t strslen
;
81 static struct elf_symbol
*fwds
;
83 static char elf_module
[FILENAME_MAX
];
85 extern struct ofmt of_elf64
;
87 static struct ELF_SECTDATA
{
92 static int elf_nsect
, nsections
;
93 static int64_t elf_foffs
;
95 static void elf_write(void);
96 static void elf_sect_write(struct elf_section
*, const void *, size_t);
97 static void elf_sect_writeaddr(struct elf_section
*, int64_t, size_t);
98 static void elf_section_header(int, int, uint64_t, void *, bool, uint64_t, int, int,
100 static void elf_write_sections(void);
101 static struct SAA
*elf_build_symtab(int32_t *, int32_t *);
102 static struct SAA
*elf_build_reltab(uint64_t *, struct elf_reloc
*);
103 static void add_sectname(char *, char *);
111 int section
; /* index into sects[] */
112 int segto
; /* internal section number */
113 char *name
; /* shallow-copied pointer of section name */
117 struct linelist
*next
;
118 struct linelist
*last
;
119 struct symlininfo info
;
130 struct sectlist
*next
;
131 struct sectlist
*last
;
134 /* common debug variables */
135 static int currentline
= 1;
136 static int debug_immcall
= 0;
138 /* stabs debug variables */
139 static struct linelist
*stabslines
= 0;
140 static int numlinestabs
= 0;
141 static char *stabs_filename
= 0;
142 static int symtabsection
;
143 static uint8_t *stabbuf
= 0, *stabstrbuf
= 0, *stabrelbuf
= 0;
144 static int stablen
, stabstrlen
, stabrellen
;
146 /* dwarf debug variables */
147 static struct linelist
*dwarf_flist
= 0, *dwarf_clist
= 0, *dwarf_elist
= 0;
148 static struct sectlist
*dwarf_fsect
= 0, *dwarf_csect
= 0, *dwarf_esect
= 0;
149 static int dwarf_numfiles
= 0, dwarf_nsections
;
150 static uint8_t *arangesbuf
= 0, *arangesrelbuf
= 0, *pubnamesbuf
= 0, *infobuf
= 0, *inforelbuf
= 0,
151 *abbrevbuf
= 0, *linebuf
= 0, *linerelbuf
= 0, *framebuf
= 0, *locbuf
= 0;
152 static int8_t line_base
= -5, line_range
= 14, opcode_base
= 13;
153 static int arangeslen
, arangesrellen
, pubnameslen
, infolen
, inforellen
,
154 abbrevlen
, linelen
, linerellen
, framelen
, loclen
;
155 static int64_t dwarf_infosym
, dwarf_abbrevsym
, dwarf_linesym
;
158 static struct dfmt df_dwarf
;
159 static struct dfmt df_stabs
;
160 static struct elf_symbol
*lastsym
;
162 /* common debugging routines */
163 static void debug64_typevalue(int32_t);
164 static void debug64_deflabel(char *, int32_t, int64_t, int, char *);
165 static void debug64_directive(const char *, const char *);
167 /* stabs debugging routines */
168 static void stabs64_linenum(const char *filename
, int32_t linenumber
, int32_t);
169 static void stabs64_output(int, void *);
170 static void stabs64_generate(void);
171 static void stabs64_cleanup(void);
173 /* dwarf debugging routines */
174 static void dwarf64_init(void);
175 static void dwarf64_linenum(const char *filename
, int32_t linenumber
, int32_t);
176 static void dwarf64_output(int, void *);
177 static void dwarf64_generate(void);
178 static void dwarf64_cleanup(void);
179 static void dwarf64_findfile(const char *);
180 static void dwarf64_findsect(const int);
183 * Special section numbers which are used to define ELF special
184 * symbols, which can be used with WRT to provide PIC relocation
187 static int32_t elf_gotpc_sect
, elf_gotoff_sect
;
188 static int32_t elf_got_sect
, elf_plt_sect
;
189 static int32_t elf_sym_sect
;
190 static int32_t elf_gottpoff_sect
;
192 static void elf_init(void)
196 nsects
= sectlen
= 0;
197 syms
= saa_init((int32_t)sizeof(struct elf_symbol
));
198 nlocals
= nglobs
= ndebugs
= 0;
201 saa_wbytes(strs
, "\0", 1L);
202 saa_wbytes(strs
, elf_module
, strlen(elf_module
)+1);
203 strslen
= 2 + strlen(elf_module
);
205 shstrtablen
= shstrtabsize
= 0;;
206 add_sectname("", "");
210 elf_gotpc_sect
= seg_alloc();
211 define_label("..gotpc", elf_gotpc_sect
+ 1, 0L, NULL
, false, false);
212 elf_gotoff_sect
= seg_alloc();
213 define_label("..gotoff", elf_gotoff_sect
+ 1, 0L, NULL
, false, false);
214 elf_got_sect
= seg_alloc();
215 define_label("..got", elf_got_sect
+ 1, 0L, NULL
, false, false);
216 elf_plt_sect
= seg_alloc();
217 define_label("..plt", elf_plt_sect
+ 1, 0L, NULL
, false, false);
218 elf_sym_sect
= seg_alloc();
219 define_label("..sym", elf_sym_sect
+ 1, 0L, NULL
, false, false);
220 elf_gottpoff_sect
= seg_alloc();
221 define_label("..gottpoff", elf_gottpoff_sect
+ 1, 0L, NULL
, false, false);
223 def_seg
= seg_alloc();
227 static void elf_cleanup(int debuginfo
)
235 for (i
= 0; i
< nsects
; i
++) {
236 if (sects
[i
]->type
!= SHT_NOBITS
)
237 saa_free(sects
[i
]->data
);
239 saa_free(sects
[i
]->rel
);
240 while (sects
[i
]->head
) {
242 sects
[i
]->head
= sects
[i
]->head
->next
;
250 if (of_elf64
.current_dfmt
) {
251 of_elf64
.current_dfmt
->cleanup();
255 /* add entry to the elf .shstrtab section */
256 static void add_sectname(char *firsthalf
, char *secondhalf
)
258 int len
= strlen(firsthalf
) + strlen(secondhalf
);
259 while (shstrtablen
+ len
+ 1 > shstrtabsize
)
260 shstrtab
= nasm_realloc(shstrtab
, (shstrtabsize
+= SHSTR_DELTA
));
261 strcpy(shstrtab
+ shstrtablen
, firsthalf
);
262 strcat(shstrtab
+ shstrtablen
, secondhalf
);
263 shstrtablen
+= len
+ 1;
266 static int elf_make_section(char *name
, int type
, int flags
, int align
)
268 struct elf_section
*s
;
270 s
= nasm_zalloc(sizeof(*s
));
272 if (type
!= SHT_NOBITS
)
273 s
->data
= saa_init(1L);
275 if (!strcmp(name
, ".text"))
278 s
->index
= seg_alloc();
279 add_sectname("", name
);
281 s
->name
= nasm_strdup(name
);
286 if (nsects
>= sectlen
)
287 sects
= nasm_realloc(sects
, (sectlen
+= SECT_DELTA
) * sizeof(*sects
));
293 static int32_t elf_section_names(char *name
, int pass
, int *bits
)
296 uint32_t flags
, flags_and
, flags_or
;
301 * Default is 64 bits.
308 p
= nasm_skip_word(name
);
311 flags_and
= flags_or
= type
= align
= 0;
313 elf_section_attrib(name
, p
, pass
, &flags_and
,
314 &flags_or
, &align
, &type
);
316 if (!strcmp(name
, ".shstrtab") ||
317 !strcmp(name
, ".symtab") ||
318 !strcmp(name
, ".strtab")) {
319 nasm_error(ERR_NONFATAL
, "attempt to redefine reserved section"
324 for (i
= 0; i
< nsects
; i
++)
325 if (!strcmp(name
, sects
[i
]->name
))
328 const struct elf_known_section
*ks
= elf_known_sections
;
331 if (!strcmp(name
, ks
->name
))
336 type
= type
? type
: ks
->type
;
337 align
= align
? align
: ks
->align
;
338 flags
= (ks
->flags
& ~flags_and
) | flags_or
;
340 i
= elf_make_section(name
, type
, flags
, align
);
341 } else if (pass
== 1) {
342 if ((type
&& sects
[i
]->type
!= type
)
343 || (align
&& sects
[i
]->align
!= align
)
344 || (flags_and
&& ((sects
[i
]->flags
& flags_and
) != flags_or
)))
345 nasm_error(ERR_WARNING
, "incompatible section attributes ignored on"
346 " redeclaration of section `%s'", name
);
349 return sects
[i
]->index
;
352 static void elf_deflabel(char *name
, int32_t segment
, int64_t offset
,
353 int is_global
, char *special
)
356 struct elf_symbol
*sym
;
357 bool special_used
= false;
359 #if defined(DEBUG) && DEBUG>2
360 nasm_error(ERR_DEBUG
,
361 " elf_deflabel: %s, seg=%"PRIx32
", off=%"PRIx64
", is_global=%d, %s\n",
362 name
, segment
, offset
, is_global
, special
);
364 if (name
[0] == '.' && name
[1] == '.' && name
[2] != '@') {
366 * This is a NASM special symbol. We never allow it into
367 * the ELF symbol table, even if it's a valid one. If it
368 * _isn't_ a valid one, we should barf immediately.
370 if (strcmp(name
, "..gotpc") && strcmp(name
, "..gotoff") &&
371 strcmp(name
, "..got") && strcmp(name
, "..plt") &&
372 strcmp(name
, "..sym") && strcmp(name
, "..gottpoff"))
373 nasm_error(ERR_NONFATAL
, "unrecognised special symbol `%s'", name
);
377 if (is_global
== 3) {
378 struct elf_symbol
**s
;
380 * Fix up a forward-reference symbol size from the first
383 for (s
= &fwds
; *s
; s
= &(*s
)->nextfwd
)
384 if (!strcmp((*s
)->name
, name
)) {
385 struct tokenval tokval
;
387 char *p
= nasm_skip_spaces(nasm_skip_word(special
));
391 tokval
.t_type
= TOKEN_INVALID
;
392 e
= evaluate(stdscan
, NULL
, &tokval
, NULL
, 1, nasm_error
, NULL
);
395 nasm_error(ERR_NONFATAL
, "cannot use relocatable"
396 " expression as symbol size");
398 (*s
)->size
= reloc_value(e
);
402 * Remove it from the list of unresolved sizes.
404 nasm_free((*s
)->name
);
408 return; /* it wasn't an important one */
411 saa_wbytes(strs
, name
, (int32_t)(1 + strlen(name
)));
412 strslen
+= 1 + strlen(name
);
414 lastsym
= sym
= saa_wstruct(syms
);
416 memset(&sym
->symv
, 0, sizeof(struct rbtree
));
419 sym
->type
= is_global
? SYM_GLOBAL
: SYM_LOCAL
;
420 sym
->other
= STV_DEFAULT
;
422 if (segment
== NO_SEG
)
423 sym
->section
= SHN_ABS
;
426 sym
->section
= SHN_UNDEF
;
427 if (segment
== def_seg
) {
428 /* we have to be sure at least text section is there */
430 if (segment
!= elf_section_names(".text", 2, &tempint
))
431 nasm_error(ERR_PANIC
, "strange segment conditions in ELF driver");
433 for (i
= 0; i
< nsects
; i
++) {
434 if (segment
== sects
[i
]->index
) {
435 sym
->section
= i
+ 1;
441 if (is_global
== 2) {
444 sym
->section
= SHN_COMMON
;
446 * We have a common variable. Check the special text to see
447 * if it's a valid number and power of two; if so, store it
448 * as the alignment for the common variable.
452 sym
->symv
.key
= readnum(special
, &err
);
454 nasm_error(ERR_NONFATAL
, "alignment constraint `%s' is not a"
455 " valid number", special
);
456 else if ((sym
->symv
.key
| (sym
->symv
.key
- 1)) != 2 * sym
->symv
.key
- 1)
457 nasm_error(ERR_NONFATAL
, "alignment constraint `%s' is not a"
458 " power of two", special
);
462 sym
->symv
.key
= (sym
->section
== SHN_UNDEF
? 0 : offset
);
464 if (sym
->type
== SYM_GLOBAL
) {
466 * If sym->section == SHN_ABS, then the first line of the
467 * else section would cause a core dump, because its a reference
468 * beyond the end of the section array.
469 * This behaviour is exhibited by this code:
472 * To avoid such a crash, such requests are silently discarded.
473 * This may not be the best solution.
475 if (sym
->section
== SHN_UNDEF
|| sym
->section
== SHN_COMMON
) {
476 bsym
= raa_write(bsym
, segment
, nglobs
);
477 } else if (sym
->section
!= SHN_ABS
) {
479 * This is a global symbol; so we must add it to the rbtree
480 * of global symbols in its section.
482 * In addition, we check the special text for symbol
483 * type and size information.
485 sects
[sym
->section
-1]->gsyms
=
486 rb_insert(sects
[sym
->section
-1]->gsyms
, &sym
->symv
);
489 int n
= strcspn(special
, " \t");
491 if (!nasm_strnicmp(special
, "function", n
))
492 sym
->type
|= STT_FUNC
;
493 else if (!nasm_strnicmp(special
, "data", n
) ||
494 !nasm_strnicmp(special
, "object", n
))
495 sym
->type
|= STT_OBJECT
;
496 else if (!nasm_strnicmp(special
, "notype", n
))
497 sym
->type
|= STT_NOTYPE
;
499 nasm_error(ERR_NONFATAL
, "unrecognised symbol type `%.*s'",
503 special
= nasm_skip_spaces(special
);
505 n
= strcspn(special
, " \t");
506 if (!nasm_strnicmp(special
, "default", n
))
507 sym
->other
= STV_DEFAULT
;
508 else if (!nasm_strnicmp(special
, "internal", n
))
509 sym
->other
= STV_INTERNAL
;
510 else if (!nasm_strnicmp(special
, "hidden", n
))
511 sym
->other
= STV_HIDDEN
;
512 else if (!nasm_strnicmp(special
, "protected", n
))
513 sym
->other
= STV_PROTECTED
;
520 struct tokenval tokval
;
523 char *saveme
= stdscan_get();
525 while (special
[n
] && nasm_isspace(special
[n
]))
528 * We have a size expression; attempt to
532 stdscan_set(special
+ n
);
533 tokval
.t_type
= TOKEN_INVALID
;
534 e
= evaluate(stdscan
, NULL
, &tokval
, &fwd
, 0, nasm_error
,
539 sym
->name
= nasm_strdup(name
);
542 nasm_error(ERR_NONFATAL
, "cannot use relocatable"
543 " expression as symbol size");
545 sym
->size
= reloc_value(e
);
552 * If TLS segment, mark symbol accordingly.
554 if (sects
[sym
->section
- 1]->flags
& SHF_TLS
) {
556 sym
->type
|= STT_TLS
;
559 sym
->globnum
= nglobs
;
564 if (special
&& !special_used
)
565 nasm_error(ERR_NONFATAL
, "no special symbol features supported here");
568 static void elf_add_reloc(struct elf_section
*sect
, int32_t segment
,
569 int64_t offset
, int type
)
573 r
= *sect
->tail
= nasm_zalloc(sizeof(struct elf_reloc
));
574 sect
->tail
= &r
->next
;
576 r
->address
= sect
->len
;
579 if (segment
!= NO_SEG
) {
581 for (i
= 0; i
< nsects
; i
++)
582 if (segment
== sects
[i
]->index
)
585 r
->symbol
= GLOBAL_TEMP_BASE
+ raa_read(bsym
, segment
);
593 * This routine deals with ..got and ..sym relocations: the more
594 * complicated kinds. In shared-library writing, some relocations
595 * with respect to global symbols must refer to the precise symbol
596 * rather than referring to an offset from the base of the section
597 * _containing_ the symbol. Such relocations call to this routine,
598 * which searches the symbol list for the symbol in question.
600 * R_386_GOT32 references require the _exact_ symbol address to be
601 * used; R_386_32 references can be at an offset from the symbol.
602 * The boolean argument `exact' tells us this.
604 * Return value is the adjusted value of `addr', having become an
605 * offset from the symbol rather than the section. Should always be
606 * zero when returning from an exact call.
608 * Limitation: if you define two symbols at the same place,
609 * confusion will occur.
611 * Inefficiency: we search, currently, using a linked list which
612 * isn't even necessarily sorted.
614 static void elf_add_gsym_reloc(struct elf_section
*sect
,
615 int32_t segment
, uint64_t offset
, int64_t pcrel
,
616 int type
, bool exact
)
619 struct elf_section
*s
;
620 struct elf_symbol
*sym
;
625 * First look up the segment/offset pair and find a global
626 * symbol corresponding to it. If it's not one of our segments,
627 * then it must be an external symbol, in which case we're fine
628 * doing a normal elf_add_reloc after first sanity-checking
629 * that the offset from the symbol is zero.
632 for (i
= 0; i
< nsects
; i
++)
633 if (segment
== sects
[i
]->index
) {
640 nasm_error(ERR_NONFATAL
, "invalid access to an external symbol");
642 elf_add_reloc(sect
, segment
, offset
- pcrel
, type
);
646 srb
= rb_search(s
->gsyms
, offset
);
647 if (!srb
|| (exact
&& srb
->key
!= offset
)) {
648 nasm_error(ERR_NONFATAL
, "unable to find a suitable global symbol"
649 " for this reference");
652 sym
= container_of(srb
, struct elf_symbol
, symv
);
654 r
= *sect
->tail
= nasm_malloc(sizeof(struct elf_reloc
));
655 sect
->tail
= &r
->next
;
658 r
->address
= sect
->len
;
659 r
->offset
= offset
- pcrel
- sym
->symv
.key
;
660 r
->symbol
= GLOBAL_TEMP_BASE
+ sym
->globnum
;
666 static void elf_out(int32_t segto
, const void *data
,
667 enum out_type type
, uint64_t size
,
668 int32_t segment
, int32_t wrt
)
670 struct elf_section
*s
;
674 static struct symlininfo sinfo
;
676 #if defined(DEBUG) && DEBUG>2
678 nasm_error(ERR_DEBUG
,
679 " elf_out line: %d type: %x seg: %"PRIx32
" segto: %"PRIx32
" bytes: %"PRIx64
" data: %"PRIx64
"\n",
680 currentline
, type
, segment
, segto
, size
, *(int64_t *)data
);
682 nasm_error(ERR_DEBUG
,
683 " elf_out line: %d type: %x seg: %"PRIx32
" segto: %"PRIx32
" bytes: %"PRIx64
"\n",
684 currentline
, type
, segment
, segto
, size
);
688 * handle absolute-assembly (structure definitions)
690 if (segto
== NO_SEG
) {
691 if (type
!= OUT_RESERVE
)
692 nasm_error(ERR_NONFATAL
, "attempt to assemble code in [ABSOLUTE]"
698 for (i
= 0; i
< nsects
; i
++)
699 if (segto
== sects
[i
]->index
) {
704 int tempint
; /* ignored */
705 if (segto
!= elf_section_names(".text", 2, &tempint
))
706 nasm_error(ERR_PANIC
, "strange segment conditions in ELF driver");
708 s
= sects
[nsects
- 1];
713 /* again some stabs debugging stuff */
714 if (of_elf64
.current_dfmt
) {
715 sinfo
.offset
= s
->len
;
718 sinfo
.name
= s
->name
;
719 of_elf64
.current_dfmt
->debug_output(TY_DEBUGSYMLIN
, &sinfo
);
721 /* end of debugging stuff */
723 if (s
->type
== SHT_NOBITS
&& type
!= OUT_RESERVE
) {
724 nasm_error(ERR_WARNING
, "attempt to initialize memory in"
725 " BSS section `%s': ignored", s
->name
);
726 s
->len
+= realsize(type
, size
);
732 if (s
->type
== SHT_PROGBITS
) {
733 nasm_error(ERR_WARNING
, "uninitialized space declared in"
734 " non-BSS section `%s': zeroing", s
->name
);
735 elf_sect_write(s
, NULL
, size
);
741 if (segment
!= NO_SEG
)
742 nasm_error(ERR_PANIC
, "OUT_RAWDATA with other than NO_SEG");
743 elf_sect_write(s
, data
, size
);
748 int isize
= (int)size
;
749 int asize
= abs(size
);
751 addr
= *(int64_t *)data
;
752 if (segment
== NO_SEG
) {
754 } else if (segment
% 2) {
755 nasm_error(ERR_NONFATAL
, "ELF format does not support"
756 " segment base references");
762 elf_add_reloc(s
, segment
, addr
, R_X86_64_8
);
766 elf_add_reloc(s
, segment
, addr
, R_X86_64_16
);
769 elf_add_reloc(s
, segment
, addr
, R_X86_64_32
);
772 elf_add_reloc(s
, segment
, addr
, R_X86_64_32S
);
776 elf_add_reloc(s
, segment
, addr
, R_X86_64_64
);
779 nasm_error(ERR_PANIC
, "internal error elf64-hpa-871");
783 } else if (wrt
== elf_gotpc_sect
+ 1) {
785 * The user will supply GOT relative to $$. ELF
786 * will let us have GOT relative to $. So we
787 * need to fix up the data item by $-$$.
790 elf_add_reloc(s
, segment
, addr
, R_X86_64_GOTPC32
);
792 } else if (wrt
== elf_gotoff_sect
+ 1) {
794 nasm_error(ERR_NONFATAL
, "ELF64 requires ..gotoff "
795 "references to be qword");
797 elf_add_reloc(s
, segment
, addr
, R_X86_64_GOTOFF64
);
800 } else if (wrt
== elf_got_sect
+ 1) {
803 elf_add_gsym_reloc(s
, segment
, addr
, 0,
804 R_X86_64_GOT32
, true);
808 elf_add_gsym_reloc(s
, segment
, addr
, 0,
809 R_X86_64_GOT64
, true);
813 nasm_error(ERR_NONFATAL
, "invalid ..got reference");
816 } else if (wrt
== elf_sym_sect
+ 1) {
820 elf_add_gsym_reloc(s
, segment
, addr
, 0,
826 elf_add_gsym_reloc(s
, segment
, addr
, 0,
831 elf_add_gsym_reloc(s
, segment
, addr
, 0,
836 elf_add_gsym_reloc(s
, segment
, addr
, 0,
837 R_X86_64_32S
, false);
842 elf_add_gsym_reloc(s
, segment
, addr
, 0,
847 nasm_error(ERR_PANIC
, "internal error elf64-hpa-903");
850 } else if (wrt
== elf_plt_sect
+ 1) {
851 nasm_error(ERR_NONFATAL
, "ELF format cannot produce non-PC-"
852 "relative PLT references");
854 nasm_error(ERR_NONFATAL
, "ELF format does not support this"
858 elf_sect_writeaddr(s
, addr
, asize
);
863 reltype
= R_X86_64_PC8
;
868 reltype
= R_X86_64_PC16
;
873 addr
= *(int64_t *)data
- size
;
874 if (segment
== segto
)
875 nasm_error(ERR_PANIC
, "intra-segment OUT_REL1ADR");
876 if (segment
== NO_SEG
) {
878 } else if (segment
% 2) {
879 nasm_error(ERR_NONFATAL
, "ELF format does not support"
880 " segment base references");
883 elf_add_reloc(s
, segment
, addr
, reltype
);
886 nasm_error(ERR_NONFATAL
,
887 "Unsupported non-32-bit ELF relocation");
890 elf_sect_writeaddr(s
, addr
, bytes
);
894 addr
= *(int64_t *)data
- size
;
895 if (segment
== segto
)
896 nasm_error(ERR_PANIC
, "intra-segment OUT_REL4ADR");
897 if (segment
== NO_SEG
) {
899 } else if (segment
% 2) {
900 nasm_error(ERR_NONFATAL
, "ELF64 format does not support"
901 " segment base references");
904 elf_add_reloc(s
, segment
, addr
, R_X86_64_PC32
);
906 } else if (wrt
== elf_plt_sect
+ 1) {
907 elf_add_gsym_reloc(s
, segment
, addr
+size
, size
,
908 R_X86_64_PLT32
, true);
910 } else if (wrt
== elf_gotpc_sect
+ 1 ||
911 wrt
== elf_got_sect
+ 1) {
912 elf_add_gsym_reloc(s
, segment
, addr
+size
, size
,
913 R_X86_64_GOTPCREL
, true);
915 } else if (wrt
== elf_gotoff_sect
+ 1 ||
916 wrt
== elf_got_sect
+ 1) {
917 nasm_error(ERR_NONFATAL
, "ELF64 requires ..gotoff references to be "
919 } else if (wrt
== elf_gottpoff_sect
+ 1) {
920 elf_add_gsym_reloc(s
, segment
, addr
+size
, size
,
921 R_X86_64_GOTTPOFF
, true);
924 nasm_error(ERR_NONFATAL
, "ELF64 format does not support this"
928 elf_sect_writeaddr(s
, addr
, 4);
932 addr
= *(int64_t *)data
- size
;
933 if (segment
== segto
)
934 nasm_error(ERR_PANIC
, "intra-segment OUT_REL8ADR");
935 if (segment
== NO_SEG
) {
937 } else if (segment
% 2) {
938 nasm_error(ERR_NONFATAL
, "ELF64 format does not support"
939 " segment base references");
942 elf_add_reloc(s
, segment
, addr
, R_X86_64_PC64
);
944 } else if (wrt
== elf_gotpc_sect
+ 1 ||
945 wrt
== elf_got_sect
+ 1) {
946 elf_add_gsym_reloc(s
, segment
, addr
+size
, size
,
947 R_X86_64_GOTPCREL64
, true);
949 } else if (wrt
== elf_gotoff_sect
+ 1 ||
950 wrt
== elf_got_sect
+ 1) {
951 nasm_error(ERR_NONFATAL
, "ELF64 requires ..gotoff references to be "
953 } else if (wrt
== elf_gottpoff_sect
+ 1) {
954 nasm_error(ERR_NONFATAL
, "ELF64 requires ..gottpoff references to be "
957 nasm_error(ERR_NONFATAL
, "ELF64 format does not support this"
961 elf_sect_writeaddr(s
, addr
, 8);
966 static void elf_write(void)
973 int32_t symtablen
, symtablocal
;
976 * Work out how many sections we will have. We have SHN_UNDEF,
977 * then the flexible user sections, then the fixed sections
978 * `.shstrtab', `.symtab' and `.strtab', then optionally
979 * relocation sections for the user sections.
981 nsections
= sec_numspecial
+ 1;
982 if (of_elf64
.current_dfmt
== &df_stabs
)
984 else if (of_elf64
.current_dfmt
== &df_dwarf
)
987 add_sectname("", ".shstrtab");
988 add_sectname("", ".symtab");
989 add_sectname("", ".strtab");
990 for (i
= 0; i
< nsects
; i
++) {
991 nsections
++; /* for the section itself */
992 if (sects
[i
]->head
) {
993 nsections
++; /* for its relocations */
994 add_sectname(".rela", sects
[i
]->name
);
998 if (of_elf64
.current_dfmt
== &df_stabs
) {
999 /* in case the debug information is wanted, just add these three sections... */
1000 add_sectname("", ".stab");
1001 add_sectname("", ".stabstr");
1002 add_sectname(".rel", ".stab");
1005 else if (of_elf64
.current_dfmt
== &df_dwarf
) {
1006 /* the dwarf debug standard specifies the following ten sections,
1007 not all of which are currently implemented,
1008 although all of them are defined. */
1009 #define debug_aranges (int64_t) (nsections-10)
1010 #define debug_info (int64_t) (nsections-7)
1011 #define debug_abbrev (int64_t) (nsections-5)
1012 #define debug_line (int64_t) (nsections-4)
1013 add_sectname("", ".debug_aranges");
1014 add_sectname(".rela", ".debug_aranges");
1015 add_sectname("", ".debug_pubnames");
1016 add_sectname("", ".debug_info");
1017 add_sectname(".rela", ".debug_info");
1018 add_sectname("", ".debug_abbrev");
1019 add_sectname("", ".debug_line");
1020 add_sectname(".rela", ".debug_line");
1021 add_sectname("", ".debug_frame");
1022 add_sectname("", ".debug_loc");
1026 * Output the ELF header.
1028 nasm_write("\177ELF\2\1\1", 7, ofile
);
1029 fputc(elf_osabi
, ofile
);
1030 fputc(elf_abiver
, ofile
);
1031 fwritezero(7, ofile
);
1032 fwriteint16_t(ET_REL
, ofile
); /* relocatable file */
1033 fwriteint16_t(EM_X86_64
, ofile
); /* processor ID */
1034 fwriteint32_t(1L, ofile
); /* EV_CURRENT file format version */
1035 fwriteint64_t(0L, ofile
); /* no entry point */
1036 fwriteint64_t(0L, ofile
); /* no program header table */
1037 fwriteint64_t(0x40L
, ofile
); /* section headers straight after
1038 * ELF header plus alignment */
1039 fwriteint32_t(0L, ofile
); /* 386 defines no special flags */
1040 fwriteint16_t(0x40, ofile
); /* size of ELF header */
1041 fwriteint16_t(0, ofile
); /* no program header table, again */
1042 fwriteint16_t(0, ofile
); /* still no program header table */
1043 fwriteint16_t(sizeof(Elf64_Shdr
), ofile
); /* size of section header */
1044 fwriteint16_t(nsections
, ofile
); /* number of sections */
1045 fwriteint16_t(sec_shstrtab
, ofile
); /* string table section index for
1046 * section header table */
1049 * Build the symbol table and relocation tables.
1051 symtab
= elf_build_symtab(&symtablen
, &symtablocal
);
1052 for (i
= 0; i
< nsects
; i
++)
1054 sects
[i
]->rel
= elf_build_reltab(§s
[i
]->rellen
,
1058 * Now output the section header table.
1061 elf_foffs
= 0x40 + sizeof(Elf64_Shdr
) * nsections
;
1062 align
= ALIGN(elf_foffs
, SEC_FILEALIGN
) - elf_foffs
;
1065 elf_sects
= nasm_malloc(sizeof(*elf_sects
) * nsections
);
1068 elf_section_header(0, SHT_NULL
, 0, NULL
, false, 0, SHN_UNDEF
, 0, 0, 0);
1071 /* The normal sections */
1072 for (i
= 0; i
< nsects
; i
++) {
1073 elf_section_header(p
- shstrtab
, sects
[i
]->type
, sects
[i
]->flags
,
1074 (sects
[i
]->type
== SHT_PROGBITS
?
1075 sects
[i
]->data
: NULL
), true,
1076 sects
[i
]->len
, 0, 0, sects
[i
]->align
, 0);
1081 elf_section_header(p
- shstrtab
, SHT_STRTAB
, 0, shstrtab
, false,
1082 shstrtablen
, 0, 0, 1, 0);
1086 elf_section_header(p
- shstrtab
, SHT_SYMTAB
, 0, symtab
, true,
1087 symtablen
, sec_strtab
, symtablocal
, 8, 24);
1091 elf_section_header(p
- shstrtab
, SHT_STRTAB
, 0, strs
, true,
1092 strslen
, 0, 0, 1, 0);
1095 /* The relocation sections */
1096 for (i
= 0; i
< nsects
; i
++)
1097 if (sects
[i
]->head
) {
1098 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, sects
[i
]->rel
, true,
1099 sects
[i
]->rellen
, sec_symtab
, i
+ 1, 8, 24);
1103 if (of_elf64
.current_dfmt
== &df_stabs
) {
1104 /* for debugging information, create the last three sections
1105 which are the .stab , .stabstr and .rel.stab sections respectively */
1107 /* this function call creates the stab sections in memory */
1110 if (stabbuf
&& stabstrbuf
&& stabrelbuf
) {
1111 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, stabbuf
, false,
1112 stablen
, sec_stabstr
, 0, 4, 12);
1115 elf_section_header(p
- shstrtab
, SHT_STRTAB
, 0, stabstrbuf
, false,
1116 stabstrlen
, 0, 0, 4, 0);
1119 /* link -> symtable info -> section to refer to */
1120 elf_section_header(p
- shstrtab
, SHT_REL
, 0, stabrelbuf
, false,
1121 stabrellen
, symtabsection
, sec_stab
, 4, 16);
1124 } else if (of_elf64
.current_dfmt
== &df_dwarf
) {
1125 /* for dwarf debugging information, create the ten dwarf sections */
1127 /* this function call creates the dwarf sections in memory */
1131 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, arangesbuf
, false,
1132 arangeslen
, 0, 0, 1, 0);
1135 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, arangesrelbuf
, false,
1136 arangesrellen
, symtabsection
, debug_aranges
, 1, 24);
1139 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, pubnamesbuf
, false,
1140 pubnameslen
, 0, 0, 1, 0);
1143 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, infobuf
, false,
1144 infolen
, 0, 0, 1, 0);
1147 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, inforelbuf
, false,
1148 inforellen
, symtabsection
, debug_info
, 1, 24);
1151 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, abbrevbuf
, false,
1152 abbrevlen
, 0, 0, 1, 0);
1155 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, linebuf
, false,
1156 linelen
, 0, 0, 1, 0);
1159 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, linerelbuf
, false,
1160 linerellen
, symtabsection
, debug_line
, 1, 24);
1163 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, framebuf
, false,
1164 framelen
, 0, 0, 8, 0);
1167 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, locbuf
, false,
1168 loclen
, 0, 0, 1, 0);
1171 fwritezero(align
, ofile
);
1174 * Now output the sections.
1176 elf_write_sections();
1178 nasm_free(elf_sects
);
1182 static struct SAA
*elf_build_symtab(int32_t *len
, int32_t *local
)
1184 struct SAA
*s
= saa_init(1L);
1185 struct elf_symbol
*sym
;
1186 uint8_t entry
[24], *p
;
1192 * First, an all-zeros entry, required by the ELF spec.
1194 saa_wbytes(s
, NULL
, 24L); /* null symbol table entry */
1199 * Next, an entry for the file name.
1202 WRITELONG(p
, 1); /* we know it's 1st entry in strtab */
1203 WRITESHORT(p
, STT_FILE
); /* type FILE */
1204 WRITESHORT(p
, SHN_ABS
);
1205 WRITEDLONG(p
, (uint64_t) 0); /* no value */
1206 WRITEDLONG(p
, (uint64_t) 0); /* no size either */
1207 saa_wbytes(s
, entry
, 24L);
1212 * Now some standard symbols defining the segments, for relocation
1215 for (i
= 1; i
<= nsects
; i
++) {
1217 WRITELONG(p
, 0); /* no symbol name */
1218 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1219 WRITESHORT(p
, i
); /* section id */
1220 WRITEDLONG(p
, (uint64_t) 0); /* offset zero */
1221 WRITEDLONG(p
, (uint64_t) 0); /* size zero */
1222 saa_wbytes(s
, entry
, 24L);
1229 * Now the other local symbols.
1232 while ((sym
= saa_rstruct(syms
))) {
1233 if (sym
->type
& SYM_GLOBAL
)
1236 WRITELONG(p
, sym
->strpos
); /* index into symbol string table */
1237 WRITECHAR(p
, sym
->type
); /* type and binding */
1238 WRITECHAR(p
, sym
->other
); /* visibility */
1239 WRITESHORT(p
, sym
->section
); /* index into section header table */
1240 WRITEDLONG(p
, (int64_t)sym
->symv
.key
); /* value of symbol */
1241 WRITEDLONG(p
, (int64_t)sym
->size
); /* size of symbol */
1242 saa_wbytes(s
, entry
, 24L);
1247 * dwarf needs symbols for debug sections
1248 * which are relocation targets.
1250 if (of_elf64
.current_dfmt
== &df_dwarf
) {
1251 dwarf_infosym
= *local
;
1253 WRITELONG(p
, 0); /* no symbol name */
1254 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1255 WRITESHORT(p
, debug_info
); /* section id */
1256 WRITEDLONG(p
, (uint64_t) 0); /* offset zero */
1257 WRITEDLONG(p
, (uint64_t) 0); /* size zero */
1258 saa_wbytes(s
, entry
, 24L);
1261 dwarf_abbrevsym
= *local
;
1263 WRITELONG(p
, 0); /* no symbol name */
1264 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1265 WRITESHORT(p
, debug_abbrev
); /* section id */
1266 WRITEDLONG(p
, (uint64_t) 0); /* offset zero */
1267 WRITEDLONG(p
, (uint64_t) 0); /* size zero */
1268 saa_wbytes(s
, entry
, 24L);
1271 dwarf_linesym
= *local
;
1273 WRITELONG(p
, 0); /* no symbol name */
1274 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1275 WRITESHORT(p
, debug_line
); /* section id */
1276 WRITEDLONG(p
, (uint64_t) 0); /* offset zero */
1277 WRITEDLONG(p
, (uint64_t) 0); /* size zero */
1278 saa_wbytes(s
, entry
, 24L);
1284 * Now the global symbols.
1287 while ((sym
= saa_rstruct(syms
))) {
1288 if (!(sym
->type
& SYM_GLOBAL
))
1291 WRITELONG(p
, sym
->strpos
);
1292 WRITECHAR(p
, sym
->type
); /* type and binding */
1293 WRITECHAR(p
, sym
->other
); /* visibility */
1294 WRITESHORT(p
, sym
->section
);
1295 WRITEDLONG(p
, (int64_t)sym
->symv
.key
);
1296 WRITEDLONG(p
, (int64_t)sym
->size
);
1297 saa_wbytes(s
, entry
, 24L);
1304 static struct SAA
*elf_build_reltab(uint64_t *len
, struct elf_reloc
*r
)
1307 uint8_t *p
, entry
[24];
1308 int32_t global_offset
;
1317 * How to onvert from a global placeholder to a real symbol index;
1318 * the +2 refers to the two special entries, the null entry and
1319 * the filename entry.
1321 global_offset
= -GLOBAL_TEMP_BASE
+ nsects
+ nlocals
+ ndebugs
+ 2;
1324 int32_t sym
= r
->symbol
;
1326 if (sym
>= GLOBAL_TEMP_BASE
)
1327 sym
+= global_offset
;
1330 WRITEDLONG(p
, r
->address
);
1331 WRITELONG(p
, r
->type
);
1333 WRITEDLONG(p
, r
->offset
);
1334 saa_wbytes(s
, entry
, 24L);
1343 static void elf_section_header(int name
, int type
, uint64_t flags
,
1344 void *data
, bool is_saa
, uint64_t datalen
,
1345 int link
, int info
, int align
, int eltsize
)
1347 elf_sects
[elf_nsect
].data
= data
;
1348 elf_sects
[elf_nsect
].len
= datalen
;
1349 elf_sects
[elf_nsect
].is_saa
= is_saa
;
1352 fwriteint32_t((int32_t)name
, ofile
);
1353 fwriteint32_t((int32_t)type
, ofile
);
1354 fwriteint64_t((int64_t)flags
, ofile
);
1355 fwriteint64_t(0L, ofile
); /* no address, ever, in object files */
1356 fwriteint64_t(type
== 0 ? 0L : elf_foffs
, ofile
);
1357 fwriteint64_t(datalen
, ofile
);
1359 elf_foffs
+= ALIGN(datalen
, SEC_FILEALIGN
);
1360 fwriteint32_t((int32_t)link
, ofile
);
1361 fwriteint32_t((int32_t)info
, ofile
);
1362 fwriteint64_t((int64_t)align
, ofile
);
1363 fwriteint64_t((int64_t)eltsize
, ofile
);
1366 static void elf_write_sections(void)
1369 for (i
= 0; i
< elf_nsect
; i
++)
1370 if (elf_sects
[i
].data
) {
1371 int32_t len
= elf_sects
[i
].len
;
1372 int32_t reallen
= ALIGN(len
, SEC_FILEALIGN
);
1373 int32_t align
= reallen
- len
;
1374 if (elf_sects
[i
].is_saa
)
1375 saa_fpwrite(elf_sects
[i
].data
, ofile
);
1377 nasm_write(elf_sects
[i
].data
, len
, ofile
);
1378 fwritezero(align
, ofile
);
1382 static void elf_sect_write(struct elf_section
*sect
, const void *data
, size_t len
)
1384 saa_wbytes(sect
->data
, data
, len
);
1388 static void elf_sect_writeaddr(struct elf_section
*sect
, int64_t data
, size_t len
)
1390 saa_writeaddr(sect
->data
, data
, len
);
1394 static void elf_sectalign(int32_t seg
, unsigned int value
)
1396 struct elf_section
*s
= NULL
;
1399 for (i
= 0; i
< nsects
; i
++) {
1400 if (sects
[i
]->index
== seg
) {
1405 if (!s
|| !is_power2(value
))
1408 if (value
> s
->align
)
1412 static int32_t elf_segbase(int32_t segment
)
1417 static void elf_filename(char *inname
, char *outname
)
1419 strcpy(elf_module
, inname
);
1420 standard_extension(inname
, outname
, ".o");
1423 extern macros_t elf_stdmac
[];
1425 static int elf_set_info(enum geninfo type
, char **val
)
1431 static struct dfmt df_dwarf
= {
1432 "ELF64 (x86-64) dwarf debug format for Linux/Unix",
1442 static struct dfmt df_stabs
= {
1443 "ELF64 (x86-64) stabs debug format for Linux/Unix",
1454 struct dfmt
*elf64_debugs_arr
[3] = { &df_dwarf
, &df_stabs
, NULL
};
1456 struct ofmt of_elf64
= {
1457 "ELF64 (x86_64) object files (e.g. Linux)",
1475 /* common debugging routines */
1476 static void debug64_deflabel(char *name
, int32_t segment
, int64_t offset
,
1477 int is_global
, char *special
)
1486 static void debug64_directive(const char *directive
, const char *params
)
1492 static void debug64_typevalue(int32_t type
)
1494 int32_t stype
, ssize
;
1495 switch (TYM_TYPE(type
)) {
1538 stype
= STT_SECTION
;
1553 if (stype
== STT_OBJECT
&& lastsym
&& !lastsym
->type
) {
1554 lastsym
->size
= ssize
;
1555 lastsym
->type
= stype
;
1559 /* stabs debugging routines */
1561 static void stabs64_linenum(const char *filename
, int32_t linenumber
, int32_t segto
)
1564 if (!stabs_filename
) {
1565 stabs_filename
= (char *)nasm_malloc(strlen(filename
) + 1);
1566 strcpy(stabs_filename
, filename
);
1568 if (strcmp(stabs_filename
, filename
)) {
1569 /* yep, a memory leak...this program is one-shot anyway, so who cares...
1570 in fact, this leak comes in quite handy to maintain a list of files
1571 encountered so far in the symbol lines... */
1573 /* why not nasm_free(stabs_filename); we're done with the old one */
1575 stabs_filename
= (char *)nasm_malloc(strlen(filename
) + 1);
1576 strcpy(stabs_filename
, filename
);
1580 currentline
= linenumber
;
1584 static void stabs64_output(int type
, void *param
)
1586 struct symlininfo
*s
;
1587 struct linelist
*el
;
1588 if (type
== TY_DEBUGSYMLIN
) {
1589 if (debug_immcall
) {
1590 s
= (struct symlininfo
*)param
;
1591 if (!(sects
[s
->section
]->flags
& SHF_EXECINSTR
))
1592 return; /* line info is only collected for executable sections */
1594 el
= (struct linelist
*)nasm_malloc(sizeof(struct linelist
));
1595 el
->info
.offset
= s
->offset
;
1596 el
->info
.section
= s
->section
;
1597 el
->info
.name
= s
->name
;
1598 el
->line
= currentline
;
1599 el
->filename
= stabs_filename
;
1602 stabslines
->last
->next
= el
;
1603 stabslines
->last
= el
;
1606 stabslines
->last
= el
;
1613 /* for creating the .stab , .stabstr and .rel.stab sections in memory */
1615 static void stabs64_generate(void)
1617 int i
, numfiles
, strsize
, numstabs
= 0, currfile
, mainfileindex
;
1618 uint8_t *sbuf
, *ssbuf
, *rbuf
, *sptr
, *rptr
;
1622 struct linelist
*ptr
;
1626 allfiles
= (char **)nasm_zalloc(numlinestabs
* sizeof(char *));
1629 if (numfiles
== 0) {
1630 allfiles
[0] = ptr
->filename
;
1633 for (i
= 0; i
< numfiles
; i
++) {
1634 if (!strcmp(allfiles
[i
], ptr
->filename
))
1637 if (i
>= numfiles
) {
1638 allfiles
[i
] = ptr
->filename
;
1645 fileidx
= (int *)nasm_malloc(numfiles
* sizeof(int));
1646 for (i
= 0; i
< numfiles
; i
++) {
1647 fileidx
[i
] = strsize
;
1648 strsize
+= strlen(allfiles
[i
]) + 1;
1651 for (i
= 0; i
< numfiles
; i
++) {
1652 if (!strcmp(allfiles
[i
], elf_module
)) {
1659 * worst case size of the stab buffer would be:
1660 * the sourcefiles changes each line, which would mean 1 SOL, 1 SYMLIN per line
1661 * plus one "ending" entry
1663 sbuf
= (uint8_t *)nasm_malloc((numlinestabs
* 2 + 4) *
1664 sizeof(struct stabentry
));
1665 ssbuf
= (uint8_t *)nasm_malloc(strsize
);
1666 rbuf
= (uint8_t *)nasm_malloc(numlinestabs
* 16 * (2 + 3));
1669 for (i
= 0; i
< numfiles
; i
++)
1670 strcpy((char *)ssbuf
+ fileidx
[i
], allfiles
[i
]);
1673 stabstrlen
= strsize
; /* set global variable for length of stab strings */
1681 * this is the first stab, its strx points to the filename of the
1682 * the source-file, the n_desc field should be set to the number
1683 * of remaining stabs
1685 WRITE_STAB(sptr
, fileidx
[0], 0, 0, 0, strlen(allfiles
[0] + 12));
1687 /* this is the stab for the main source file */
1688 WRITE_STAB(sptr
, fileidx
[mainfileindex
], N_SO
, 0, 0, 0);
1690 /* relocation table entry */
1693 * Since the symbol table has two entries before
1694 * the section symbols, the index in the info.section
1695 * member must be adjusted by adding 2
1698 WRITEDLONG(rptr
, (int64_t)(sptr
- sbuf
) - 4);
1699 WRITELONG(rptr
, R_X86_64_32
);
1700 WRITELONG(rptr
, ptr
->info
.section
+ 2);
1703 currfile
= mainfileindex
;
1707 if (strcmp(allfiles
[currfile
], ptr
->filename
)) {
1708 /* oops file has changed... */
1709 for (i
= 0; i
< numfiles
; i
++)
1710 if (!strcmp(allfiles
[i
], ptr
->filename
))
1713 WRITE_STAB(sptr
, fileidx
[currfile
], N_SOL
, 0, 0,
1717 /* relocation table entry */
1719 WRITEDLONG(rptr
, (int64_t)(sptr
- sbuf
) - 4);
1720 WRITELONG(rptr
, R_X86_64_32
);
1721 WRITELONG(rptr
, ptr
->info
.section
+ 2);
1724 WRITE_STAB(sptr
, 0, N_SLINE
, 0, ptr
->line
, ptr
->info
.offset
);
1727 /* relocation table entry */
1729 WRITEDLONG(rptr
, (int64_t)(sptr
- sbuf
) - 4);
1730 WRITELONG(rptr
, R_X86_64_32
);
1731 WRITELONG(rptr
, ptr
->info
.section
+ 2);
1737 /* this is an "ending" token */
1738 WRITE_STAB(sptr
, 0, N_SO
, 0, 0, 0);
1741 ((struct stabentry
*)sbuf
)->n_desc
= numstabs
;
1743 nasm_free(allfiles
);
1746 stablen
= (sptr
- sbuf
);
1747 stabrellen
= (rptr
- rbuf
);
1753 static void stabs64_cleanup(void)
1755 struct linelist
*ptr
, *del
;
1767 nasm_free(stabrelbuf
);
1768 nasm_free(stabstrbuf
);
1771 /* dwarf routines */
1773 static void dwarf64_init(void)
1775 ndebugs
= 3; /* 3 debug symbols */
1778 static void dwarf64_linenum(const char *filename
, int32_t linenumber
,
1782 dwarf64_findfile(filename
);
1784 currentline
= linenumber
;
1787 /* called from elf_out with type == TY_DEBUGSYMLIN */
1788 static void dwarf64_output(int type
, void *param
)
1790 int ln
, aa
, inx
, maxln
, soc
;
1791 struct symlininfo
*s
;
1796 s
= (struct symlininfo
*)param
;
1798 /* line number info is only gathered for executable sections */
1799 if (!(sects
[s
->section
]->flags
& SHF_EXECINSTR
))
1802 /* Check if section index has changed */
1803 if (!(dwarf_csect
&& (dwarf_csect
->section
) == (s
->section
)))
1804 dwarf64_findsect(s
->section
);
1806 /* do nothing unless line or file has changed */
1810 ln
= currentline
- dwarf_csect
->line
;
1811 aa
= s
->offset
- dwarf_csect
->offset
;
1812 inx
= dwarf_clist
->line
;
1813 plinep
= dwarf_csect
->psaa
;
1814 /* check for file change */
1815 if (!(inx
== dwarf_csect
->file
)) {
1816 saa_write8(plinep
,DW_LNS_set_file
);
1817 saa_write8(plinep
,inx
);
1818 dwarf_csect
->file
= inx
;
1820 /* check for line change */
1822 /* test if in range of special op code */
1823 maxln
= line_base
+ line_range
;
1824 soc
= (ln
- line_base
) + (line_range
* aa
) + opcode_base
;
1825 if (ln
>= line_base
&& ln
< maxln
&& soc
< 256) {
1826 saa_write8(plinep
,soc
);
1828 saa_write8(plinep
,DW_LNS_advance_line
);
1829 saa_wleb128s(plinep
,ln
);
1831 saa_write8(plinep
,DW_LNS_advance_pc
);
1832 saa_wleb128u(plinep
,aa
);
1835 dwarf_csect
->line
= currentline
;
1836 dwarf_csect
->offset
= s
->offset
;
1839 /* show change handled */
1844 static void dwarf64_generate(void)
1848 struct linelist
*ftentry
;
1849 struct SAA
*paranges
, *ppubnames
, *pinfo
, *pabbrev
, *plines
, *plinep
;
1850 struct SAA
*parangesrel
, *plinesrel
, *pinforel
;
1851 struct sectlist
*psect
;
1852 size_t saalen
, linepoff
, totlen
, highaddr
;
1854 /* write epilogues for each line program range */
1855 /* and build aranges section */
1856 paranges
= saa_init(1L);
1857 parangesrel
= saa_init(1L);
1858 saa_write16(paranges
,3); /* dwarf version */
1859 saa_write64(parangesrel
, paranges
->datalen
+4);
1860 saa_write64(parangesrel
, (dwarf_infosym
<< 32) + R_X86_64_32
); /* reloc to info */
1861 saa_write64(parangesrel
, 0);
1862 saa_write32(paranges
,0); /* offset into info */
1863 saa_write8(paranges
,8); /* pointer size */
1864 saa_write8(paranges
,0); /* not segmented */
1865 saa_write32(paranges
,0); /* padding */
1866 /* iterate though sectlist entries */
1867 psect
= dwarf_fsect
;
1870 for (indx
= 0; indx
< dwarf_nsections
; indx
++)
1872 plinep
= psect
->psaa
;
1873 /* Line Number Program Epilogue */
1874 saa_write8(plinep
,2); /* std op 2 */
1875 saa_write8(plinep
,(sects
[psect
->section
]->len
)-psect
->offset
);
1876 saa_write8(plinep
,DW_LNS_extended_op
);
1877 saa_write8(plinep
,1); /* operand length */
1878 saa_write8(plinep
,DW_LNE_end_sequence
);
1879 totlen
+= plinep
->datalen
;
1880 /* range table relocation entry */
1881 saa_write64(parangesrel
, paranges
->datalen
+ 4);
1882 saa_write64(parangesrel
, ((uint64_t) (psect
->section
+ 2) << 32) + R_X86_64_64
);
1883 saa_write64(parangesrel
, (uint64_t) 0);
1884 /* range table entry */
1885 saa_write64(paranges
,0x0000); /* range start */
1886 saa_write64(paranges
,sects
[psect
->section
]->len
); /* range length */
1887 highaddr
+= sects
[psect
->section
]->len
;
1888 /* done with this entry */
1889 psect
= psect
->next
;
1891 saa_write64(paranges
,0); /* null address */
1892 saa_write64(paranges
,0); /* null length */
1893 saalen
= paranges
->datalen
;
1894 arangeslen
= saalen
+ 4;
1895 arangesbuf
= pbuf
= nasm_malloc(arangeslen
);
1896 WRITELONG(pbuf
,saalen
); /* initial length */
1897 saa_rnbytes(paranges
, pbuf
, saalen
);
1900 /* build rela.aranges section */
1901 arangesrellen
= saalen
= parangesrel
->datalen
;
1902 arangesrelbuf
= pbuf
= nasm_malloc(arangesrellen
);
1903 saa_rnbytes(parangesrel
, pbuf
, saalen
);
1904 saa_free(parangesrel
);
1906 /* build pubnames section */
1907 ppubnames
= saa_init(1L);
1908 saa_write16(ppubnames
,3); /* dwarf version */
1909 saa_write32(ppubnames
,0); /* offset into info */
1910 saa_write32(ppubnames
,0); /* space used in info */
1911 saa_write32(ppubnames
,0); /* end of list */
1912 saalen
= ppubnames
->datalen
;
1913 pubnameslen
= saalen
+ 4;
1914 pubnamesbuf
= pbuf
= nasm_malloc(pubnameslen
);
1915 WRITELONG(pbuf
,saalen
); /* initial length */
1916 saa_rnbytes(ppubnames
, pbuf
, saalen
);
1917 saa_free(ppubnames
);
1919 /* build info section */
1920 pinfo
= saa_init(1L);
1921 pinforel
= saa_init(1L);
1922 saa_write16(pinfo
,3); /* dwarf version */
1923 saa_write64(pinforel
, pinfo
->datalen
+ 4);
1924 saa_write64(pinforel
, (dwarf_abbrevsym
<< 32) + R_X86_64_32
); /* reloc to abbrev */
1925 saa_write64(pinforel
, 0);
1926 saa_write32(pinfo
,0); /* offset into abbrev */
1927 saa_write8(pinfo
,8); /* pointer size */
1928 saa_write8(pinfo
,1); /* abbrviation number LEB128u */
1929 saa_write64(pinforel
, pinfo
->datalen
+ 4);
1930 saa_write64(pinforel
, ((uint64_t)(dwarf_fsect
->section
+ 2) << 32) + R_X86_64_64
);
1931 saa_write64(pinforel
, 0);
1932 saa_write64(pinfo
,0); /* DW_AT_low_pc */
1933 saa_write64(pinforel
, pinfo
->datalen
+ 4);
1934 saa_write64(pinforel
, ((uint64_t)(dwarf_fsect
->section
+ 2) << 32) + R_X86_64_64
);
1935 saa_write64(pinforel
, 0);
1936 saa_write64(pinfo
,highaddr
); /* DW_AT_high_pc */
1937 saa_write64(pinforel
, pinfo
->datalen
+ 4);
1938 saa_write64(pinforel
, (dwarf_linesym
<< 32) + R_X86_64_32
); /* reloc to line */
1939 saa_write64(pinforel
, 0);
1940 saa_write32(pinfo
,0); /* DW_AT_stmt_list */
1941 saa_wbytes(pinfo
, elf_module
, strlen(elf_module
)+1);
1942 saa_wbytes(pinfo
, nasm_signature
, strlen(nasm_signature
)+1);
1943 saa_write16(pinfo
,DW_LANG_Mips_Assembler
);
1944 saa_write8(pinfo
,2); /* abbrviation number LEB128u */
1945 saa_write64(pinforel
, pinfo
->datalen
+ 4);
1946 saa_write64(pinforel
, ((uint64_t)(dwarf_fsect
->section
+ 2) << 32) + R_X86_64_64
);
1947 saa_write64(pinforel
, 0);
1948 saa_write64(pinfo
,0); /* DW_AT_low_pc */
1949 saa_write64(pinfo
,0); /* DW_AT_frame_base */
1950 saa_write8(pinfo
,0); /* end of entries */
1951 saalen
= pinfo
->datalen
;
1952 infolen
= saalen
+ 4;
1953 infobuf
= pbuf
= nasm_malloc(infolen
);
1954 WRITELONG(pbuf
,saalen
); /* initial length */
1955 saa_rnbytes(pinfo
, pbuf
, saalen
);
1958 /* build rela.info section */
1959 inforellen
= saalen
= pinforel
->datalen
;
1960 inforelbuf
= pbuf
= nasm_malloc(inforellen
);
1961 saa_rnbytes(pinforel
, pbuf
, saalen
);
1964 /* build abbrev section */
1965 pabbrev
= saa_init(1L);
1966 saa_write8(pabbrev
,1); /* entry number LEB128u */
1967 saa_write8(pabbrev
,DW_TAG_compile_unit
); /* tag LEB128u */
1968 saa_write8(pabbrev
,1); /* has children */
1969 /* the following attributes and forms are all LEB128u values */
1970 saa_write8(pabbrev
,DW_AT_low_pc
);
1971 saa_write8(pabbrev
,DW_FORM_addr
);
1972 saa_write8(pabbrev
,DW_AT_high_pc
);
1973 saa_write8(pabbrev
,DW_FORM_addr
);
1974 saa_write8(pabbrev
,DW_AT_stmt_list
);
1975 saa_write8(pabbrev
,DW_FORM_data4
);
1976 saa_write8(pabbrev
,DW_AT_name
);
1977 saa_write8(pabbrev
,DW_FORM_string
);
1978 saa_write8(pabbrev
,DW_AT_producer
);
1979 saa_write8(pabbrev
,DW_FORM_string
);
1980 saa_write8(pabbrev
,DW_AT_language
);
1981 saa_write8(pabbrev
,DW_FORM_data2
);
1982 saa_write16(pabbrev
,0); /* end of entry */
1983 /* LEB128u usage same as above */
1984 saa_write8(pabbrev
,2); /* entry number */
1985 saa_write8(pabbrev
,DW_TAG_subprogram
);
1986 saa_write8(pabbrev
,0); /* no children */
1987 saa_write8(pabbrev
,DW_AT_low_pc
);
1988 saa_write8(pabbrev
,DW_FORM_addr
);
1989 saa_write8(pabbrev
,DW_AT_frame_base
);
1990 saa_write8(pabbrev
,DW_FORM_data4
);
1991 saa_write16(pabbrev
,0); /* end of entry */
1992 abbrevlen
= saalen
= pabbrev
->datalen
;
1993 abbrevbuf
= pbuf
= nasm_malloc(saalen
);
1994 saa_rnbytes(pabbrev
, pbuf
, saalen
);
1997 /* build line section */
1999 plines
= saa_init(1L);
2000 saa_write8(plines
,1); /* Minimum Instruction Length */
2001 saa_write8(plines
,1); /* Initial value of 'is_stmt' */
2002 saa_write8(plines
,line_base
); /* Line Base */
2003 saa_write8(plines
,line_range
); /* Line Range */
2004 saa_write8(plines
,opcode_base
); /* Opcode Base */
2005 /* standard opcode lengths (# of LEB128u operands) */
2006 saa_write8(plines
,0); /* Std opcode 1 length */
2007 saa_write8(plines
,1); /* Std opcode 2 length */
2008 saa_write8(plines
,1); /* Std opcode 3 length */
2009 saa_write8(plines
,1); /* Std opcode 4 length */
2010 saa_write8(plines
,1); /* Std opcode 5 length */
2011 saa_write8(plines
,0); /* Std opcode 6 length */
2012 saa_write8(plines
,0); /* Std opcode 7 length */
2013 saa_write8(plines
,0); /* Std opcode 8 length */
2014 saa_write8(plines
,1); /* Std opcode 9 length */
2015 saa_write8(plines
,0); /* Std opcode 10 length */
2016 saa_write8(plines
,0); /* Std opcode 11 length */
2017 saa_write8(plines
,1); /* Std opcode 12 length */
2018 /* Directory Table */
2019 saa_write8(plines
,0); /* End of table */
2020 /* File Name Table */
2021 ftentry
= dwarf_flist
;
2022 for (indx
= 0;indx
<dwarf_numfiles
;indx
++)
2024 saa_wbytes(plines
, ftentry
->filename
, (int32_t)(strlen(ftentry
->filename
) + 1));
2025 saa_write8(plines
,0); /* directory LEB128u */
2026 saa_write8(plines
,0); /* time LEB128u */
2027 saa_write8(plines
,0); /* size LEB128u */
2028 ftentry
= ftentry
->next
;
2030 saa_write8(plines
,0); /* End of table */
2031 linepoff
= plines
->datalen
;
2032 linelen
= linepoff
+ totlen
+ 10;
2033 linebuf
= pbuf
= nasm_malloc(linelen
);
2034 WRITELONG(pbuf
,linelen
-4); /* initial length */
2035 WRITESHORT(pbuf
,3); /* dwarf version */
2036 WRITELONG(pbuf
,linepoff
); /* offset to line number program */
2037 /* write line header */
2039 saa_rnbytes(plines
, pbuf
, saalen
); /* read a given no. of bytes */
2042 /* concatonate line program ranges */
2044 plinesrel
= saa_init(1L);
2045 psect
= dwarf_fsect
;
2046 for (indx
= 0; indx
< dwarf_nsections
; indx
++) {
2047 saa_write64(plinesrel
, linepoff
);
2048 saa_write64(plinesrel
, ((uint64_t) (psect
->section
+ 2) << 32) + R_X86_64_64
);
2049 saa_write64(plinesrel
, (uint64_t) 0);
2050 plinep
= psect
->psaa
;
2051 saalen
= plinep
->datalen
;
2052 saa_rnbytes(plinep
, pbuf
, saalen
);
2056 /* done with this entry */
2057 psect
= psect
->next
;
2061 /* build rela.lines section */
2062 linerellen
=saalen
= plinesrel
->datalen
;
2063 linerelbuf
= pbuf
= nasm_malloc(linerellen
);
2064 saa_rnbytes(plinesrel
, pbuf
, saalen
);
2065 saa_free(plinesrel
);
2067 /* build frame section */
2069 framebuf
= pbuf
= nasm_malloc(framelen
);
2070 WRITELONG(pbuf
,framelen
-4); /* initial length */
2072 /* build loc section */
2074 locbuf
= pbuf
= nasm_malloc(loclen
);
2075 WRITEDLONG(pbuf
,0); /* null beginning offset */
2076 WRITEDLONG(pbuf
,0); /* null ending offset */
2079 static void dwarf64_cleanup(void)
2081 nasm_free(arangesbuf
);
2082 nasm_free(arangesrelbuf
);
2083 nasm_free(pubnamesbuf
);
2085 nasm_free(inforelbuf
);
2086 nasm_free(abbrevbuf
);
2088 nasm_free(linerelbuf
);
2089 nasm_free(framebuf
);
2093 static void dwarf64_findfile(const char * fname
)
2096 struct linelist
*match
;
2098 /* return if fname is current file name */
2099 if (dwarf_clist
&& !(strcmp(fname
, dwarf_clist
->filename
)))
2102 /* search for match */
2105 match
= dwarf_flist
;
2106 for (finx
= 0; finx
< dwarf_numfiles
; finx
++) {
2107 if (!(strcmp(fname
, match
->filename
))) {
2108 dwarf_clist
= match
;
2114 /* add file name to end of list */
2115 dwarf_clist
= (struct linelist
*)nasm_malloc(sizeof(struct linelist
));
2117 dwarf_clist
->line
= dwarf_numfiles
;
2118 dwarf_clist
->filename
= nasm_malloc(strlen(fname
) + 1);
2119 strcpy(dwarf_clist
->filename
,fname
);
2120 dwarf_clist
->next
= 0;
2121 if (!dwarf_flist
) { /* if first entry */
2122 dwarf_flist
= dwarf_elist
= dwarf_clist
;
2123 dwarf_clist
->last
= 0;
2124 } else { /* chain to previous entry */
2125 dwarf_elist
->next
= dwarf_clist
;
2126 dwarf_elist
= dwarf_clist
;
2130 static void dwarf64_findsect(const int index
)
2133 struct sectlist
*match
;
2136 /* return if index is current section index */
2137 if (dwarf_csect
&& (dwarf_csect
->section
== index
))
2140 /* search for match */
2143 match
= dwarf_fsect
;
2144 for (sinx
= 0; sinx
< dwarf_nsections
; sinx
++) {
2145 if (match
->section
== index
) {
2146 dwarf_csect
= match
;
2149 match
= match
->next
;
2153 /* add entry to end of list */
2154 dwarf_csect
= (struct sectlist
*)nasm_malloc(sizeof(struct sectlist
));
2156 dwarf_csect
->psaa
= plinep
= saa_init(1L);
2157 dwarf_csect
->line
= 1;
2158 dwarf_csect
->offset
= 0;
2159 dwarf_csect
->file
= 1;
2160 dwarf_csect
->section
= index
;
2161 dwarf_csect
->next
= 0;
2162 /* set relocatable address at start of line program */
2163 saa_write8(plinep
,DW_LNS_extended_op
);
2164 saa_write8(plinep
,9); /* operand length */
2165 saa_write8(plinep
,DW_LNE_set_address
);
2166 saa_write64(plinep
,0); /* Start Address */
2168 if (!dwarf_fsect
) { /* if first entry */
2169 dwarf_fsect
= dwarf_esect
= dwarf_csect
;
2170 dwarf_csect
->last
= 0;
2171 } else { /* chain to previous entry */
2172 dwarf_esect
->next
= dwarf_csect
;
2173 dwarf_esect
= dwarf_csect
;