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)
195 nsects
= sectlen
= 0;
196 syms
= saa_init((int32_t)sizeof(struct elf_symbol
));
197 nlocals
= nglobs
= ndebugs
= 0;
200 saa_wbytes(strs
, "\0", 1L);
201 saa_wbytes(strs
, elf_module
, strlen(elf_module
)+1);
202 strslen
= 2 + strlen(elf_module
);
204 shstrtablen
= shstrtabsize
= 0;;
205 add_sectname("", "");
209 elf_gotpc_sect
= seg_alloc();
210 define_label("..gotpc", elf_gotpc_sect
+ 1, 0L, NULL
, false, false);
211 elf_gotoff_sect
= seg_alloc();
212 define_label("..gotoff", elf_gotoff_sect
+ 1, 0L, NULL
, false, false);
213 elf_got_sect
= seg_alloc();
214 define_label("..got", elf_got_sect
+ 1, 0L, NULL
, false, false);
215 elf_plt_sect
= seg_alloc();
216 define_label("..plt", elf_plt_sect
+ 1, 0L, NULL
, false, false);
217 elf_sym_sect
= seg_alloc();
218 define_label("..sym", elf_sym_sect
+ 1, 0L, NULL
, false, false);
219 elf_gottpoff_sect
= seg_alloc();
220 define_label("..gottpoff", elf_gottpoff_sect
+ 1, 0L, NULL
, false, false);
222 def_seg
= seg_alloc();
226 static void elf_cleanup(int debuginfo
)
234 for (i
= 0; i
< nsects
; i
++) {
235 if (sects
[i
]->type
!= SHT_NOBITS
)
236 saa_free(sects
[i
]->data
);
238 saa_free(sects
[i
]->rel
);
239 while (sects
[i
]->head
) {
241 sects
[i
]->head
= sects
[i
]->head
->next
;
249 if (of_elf64
.current_dfmt
) {
250 of_elf64
.current_dfmt
->cleanup();
254 /* add entry to the elf .shstrtab section */
255 static void add_sectname(char *firsthalf
, char *secondhalf
)
257 int len
= strlen(firsthalf
) + strlen(secondhalf
);
258 while (shstrtablen
+ len
+ 1 > shstrtabsize
)
259 shstrtab
= nasm_realloc(shstrtab
, (shstrtabsize
+= SHSTR_DELTA
));
260 strcpy(shstrtab
+ shstrtablen
, firsthalf
);
261 strcat(shstrtab
+ shstrtablen
, secondhalf
);
262 shstrtablen
+= len
+ 1;
265 static int elf_make_section(char *name
, int type
, int flags
, int align
)
267 struct elf_section
*s
;
269 s
= nasm_zalloc(sizeof(*s
));
271 if (type
!= SHT_NOBITS
)
272 s
->data
= saa_init(1L);
274 if (!strcmp(name
, ".text"))
277 s
->index
= seg_alloc();
278 add_sectname("", name
);
280 s
->name
= nasm_strdup(name
);
285 if (nsects
>= sectlen
)
286 sects
= nasm_realloc(sects
, (sectlen
+= SECT_DELTA
) * sizeof(*sects
));
292 static int32_t elf_section_names(char *name
, int pass
, int *bits
)
295 uint32_t flags
, flags_and
, flags_or
;
300 * Default is 64 bits.
307 p
= nasm_skip_word(name
);
310 flags_and
= flags_or
= type
= align
= 0;
312 elf_section_attrib(name
, p
, pass
, &flags_and
,
313 &flags_or
, &align
, &type
);
315 if (!strcmp(name
, ".shstrtab") ||
316 !strcmp(name
, ".symtab") ||
317 !strcmp(name
, ".strtab")) {
318 nasm_error(ERR_NONFATAL
, "attempt to redefine reserved section"
323 for (i
= 0; i
< nsects
; i
++)
324 if (!strcmp(name
, sects
[i
]->name
))
327 const struct elf_known_section
*ks
= elf_known_sections
;
330 if (!strcmp(name
, ks
->name
))
335 type
= type
? type
: ks
->type
;
336 align
= align
? align
: ks
->align
;
337 flags
= (ks
->flags
& ~flags_and
) | flags_or
;
339 i
= elf_make_section(name
, type
, flags
, align
);
340 } else if (pass
== 1) {
341 if ((type
&& sects
[i
]->type
!= type
)
342 || (align
&& sects
[i
]->align
!= align
)
343 || (flags_and
&& ((sects
[i
]->flags
& flags_and
) != flags_or
)))
344 nasm_error(ERR_WARNING
, "incompatible section attributes ignored on"
345 " redeclaration of section `%s'", name
);
348 return sects
[i
]->index
;
351 static void elf_deflabel(char *name
, int32_t segment
, int64_t offset
,
352 int is_global
, char *special
)
355 struct elf_symbol
*sym
;
356 bool special_used
= false;
358 #if defined(DEBUG) && DEBUG>2
359 nasm_error(ERR_DEBUG
,
360 " elf_deflabel: %s, seg=%"PRIx32
", off=%"PRIx64
", is_global=%d, %s\n",
361 name
, segment
, offset
, is_global
, special
);
363 if (name
[0] == '.' && name
[1] == '.' && name
[2] != '@') {
365 * This is a NASM special symbol. We never allow it into
366 * the ELF symbol table, even if it's a valid one. If it
367 * _isn't_ a valid one, we should barf immediately.
369 if (strcmp(name
, "..gotpc") && strcmp(name
, "..gotoff") &&
370 strcmp(name
, "..got") && strcmp(name
, "..plt") &&
371 strcmp(name
, "..sym") && strcmp(name
, "..gottpoff"))
372 nasm_error(ERR_NONFATAL
, "unrecognised special symbol `%s'", name
);
376 if (is_global
== 3) {
377 struct elf_symbol
**s
;
379 * Fix up a forward-reference symbol size from the first
382 for (s
= &fwds
; *s
; s
= &(*s
)->nextfwd
)
383 if (!strcmp((*s
)->name
, name
)) {
384 struct tokenval tokval
;
386 char *p
= nasm_skip_spaces(nasm_skip_word(special
));
390 tokval
.t_type
= TOKEN_INVALID
;
391 e
= evaluate(stdscan
, NULL
, &tokval
, NULL
, 1, nasm_error
, NULL
);
394 nasm_error(ERR_NONFATAL
, "cannot use relocatable"
395 " expression as symbol size");
397 (*s
)->size
= reloc_value(e
);
401 * Remove it from the list of unresolved sizes.
403 nasm_free((*s
)->name
);
407 return; /* it wasn't an important one */
410 saa_wbytes(strs
, name
, (int32_t)(1 + strlen(name
)));
411 strslen
+= 1 + strlen(name
);
413 lastsym
= sym
= saa_wstruct(syms
);
415 memset(&sym
->symv
, 0, sizeof(struct rbtree
));
418 sym
->type
= is_global
? SYM_GLOBAL
: SYM_LOCAL
;
419 sym
->other
= STV_DEFAULT
;
421 if (segment
== NO_SEG
)
422 sym
->section
= SHN_ABS
;
425 sym
->section
= SHN_UNDEF
;
426 if (segment
== def_seg
) {
427 /* we have to be sure at least text section is there */
429 if (segment
!= elf_section_names(".text", 2, &tempint
))
430 nasm_error(ERR_PANIC
, "strange segment conditions in ELF driver");
432 for (i
= 0; i
< nsects
; i
++) {
433 if (segment
== sects
[i
]->index
) {
434 sym
->section
= i
+ 1;
440 if (is_global
== 2) {
443 sym
->section
= SHN_COMMON
;
445 * We have a common variable. Check the special text to see
446 * if it's a valid number and power of two; if so, store it
447 * as the alignment for the common variable.
451 sym
->symv
.key
= readnum(special
, &err
);
453 nasm_error(ERR_NONFATAL
, "alignment constraint `%s' is not a"
454 " valid number", special
);
455 else if ((sym
->symv
.key
| (sym
->symv
.key
- 1)) != 2 * sym
->symv
.key
- 1)
456 nasm_error(ERR_NONFATAL
, "alignment constraint `%s' is not a"
457 " power of two", special
);
461 sym
->symv
.key
= (sym
->section
== SHN_UNDEF
? 0 : offset
);
463 if (sym
->type
== SYM_GLOBAL
) {
465 * If sym->section == SHN_ABS, then the first line of the
466 * else section would cause a core dump, because its a reference
467 * beyond the end of the section array.
468 * This behaviour is exhibited by this code:
471 * To avoid such a crash, such requests are silently discarded.
472 * This may not be the best solution.
474 if (sym
->section
== SHN_UNDEF
|| sym
->section
== SHN_COMMON
) {
475 bsym
= raa_write(bsym
, segment
, nglobs
);
476 } else if (sym
->section
!= SHN_ABS
) {
478 * This is a global symbol; so we must add it to the rbtree
479 * of global symbols in its section.
481 * In addition, we check the special text for symbol
482 * type and size information.
484 sects
[sym
->section
-1]->gsyms
=
485 rb_insert(sects
[sym
->section
-1]->gsyms
, &sym
->symv
);
488 int n
= strcspn(special
, " \t");
490 if (!nasm_strnicmp(special
, "function", n
))
491 sym
->type
|= STT_FUNC
;
492 else if (!nasm_strnicmp(special
, "data", n
) ||
493 !nasm_strnicmp(special
, "object", n
))
494 sym
->type
|= STT_OBJECT
;
495 else if (!nasm_strnicmp(special
, "notype", n
))
496 sym
->type
|= STT_NOTYPE
;
498 nasm_error(ERR_NONFATAL
, "unrecognised symbol type `%.*s'",
502 special
= nasm_skip_spaces(special
);
504 n
= strcspn(special
, " \t");
505 if (!nasm_strnicmp(special
, "default", n
))
506 sym
->other
= STV_DEFAULT
;
507 else if (!nasm_strnicmp(special
, "internal", n
))
508 sym
->other
= STV_INTERNAL
;
509 else if (!nasm_strnicmp(special
, "hidden", n
))
510 sym
->other
= STV_HIDDEN
;
511 else if (!nasm_strnicmp(special
, "protected", n
))
512 sym
->other
= STV_PROTECTED
;
519 struct tokenval tokval
;
522 char *saveme
= stdscan_get();
524 while (special
[n
] && nasm_isspace(special
[n
]))
527 * We have a size expression; attempt to
531 stdscan_set(special
+ n
);
532 tokval
.t_type
= TOKEN_INVALID
;
533 e
= evaluate(stdscan
, NULL
, &tokval
, &fwd
, 0, nasm_error
,
538 sym
->name
= nasm_strdup(name
);
541 nasm_error(ERR_NONFATAL
, "cannot use relocatable"
542 " expression as symbol size");
544 sym
->size
= reloc_value(e
);
551 * If TLS segment, mark symbol accordingly.
553 if (sects
[sym
->section
- 1]->flags
& SHF_TLS
) {
555 sym
->type
|= STT_TLS
;
558 sym
->globnum
= nglobs
;
563 if (special
&& !special_used
)
564 nasm_error(ERR_NONFATAL
, "no special symbol features supported here");
567 static void elf_add_reloc(struct elf_section
*sect
, int32_t segment
,
568 int64_t offset
, int type
)
572 r
= *sect
->tail
= nasm_zalloc(sizeof(struct elf_reloc
));
573 sect
->tail
= &r
->next
;
575 r
->address
= sect
->len
;
578 if (segment
!= NO_SEG
) {
580 for (i
= 0; i
< nsects
; i
++)
581 if (segment
== sects
[i
]->index
)
584 r
->symbol
= GLOBAL_TEMP_BASE
+ raa_read(bsym
, segment
);
592 * This routine deals with ..got and ..sym relocations: the more
593 * complicated kinds. In shared-library writing, some relocations
594 * with respect to global symbols must refer to the precise symbol
595 * rather than referring to an offset from the base of the section
596 * _containing_ the symbol. Such relocations call to this routine,
597 * which searches the symbol list for the symbol in question.
599 * R_386_GOT32 references require the _exact_ symbol address to be
600 * used; R_386_32 references can be at an offset from the symbol.
601 * The boolean argument `exact' tells us this.
603 * Return value is the adjusted value of `addr', having become an
604 * offset from the symbol rather than the section. Should always be
605 * zero when returning from an exact call.
607 * Limitation: if you define two symbols at the same place,
608 * confusion will occur.
610 * Inefficiency: we search, currently, using a linked list which
611 * isn't even necessarily sorted.
613 static void elf_add_gsym_reloc(struct elf_section
*sect
,
614 int32_t segment
, uint64_t offset
, int64_t pcrel
,
615 int type
, bool exact
)
618 struct elf_section
*s
;
619 struct elf_symbol
*sym
;
624 * First look up the segment/offset pair and find a global
625 * symbol corresponding to it. If it's not one of our segments,
626 * then it must be an external symbol, in which case we're fine
627 * doing a normal elf_add_reloc after first sanity-checking
628 * that the offset from the symbol is zero.
631 for (i
= 0; i
< nsects
; i
++)
632 if (segment
== sects
[i
]->index
) {
639 nasm_error(ERR_NONFATAL
, "invalid access to an external symbol");
641 elf_add_reloc(sect
, segment
, offset
- pcrel
, type
);
645 srb
= rb_search(s
->gsyms
, offset
);
646 if (!srb
|| (exact
&& srb
->key
!= offset
)) {
647 nasm_error(ERR_NONFATAL
, "unable to find a suitable global symbol"
648 " for this reference");
651 sym
= container_of(srb
, struct elf_symbol
, symv
);
653 r
= *sect
->tail
= nasm_malloc(sizeof(struct elf_reloc
));
654 sect
->tail
= &r
->next
;
657 r
->address
= sect
->len
;
658 r
->offset
= offset
- pcrel
- sym
->symv
.key
;
659 r
->symbol
= GLOBAL_TEMP_BASE
+ sym
->globnum
;
665 static void elf_out(int32_t segto
, const void *data
,
666 enum out_type type
, uint64_t size
,
667 int32_t segment
, int32_t wrt
)
669 struct elf_section
*s
;
673 static struct symlininfo sinfo
;
675 #if defined(DEBUG) && DEBUG>2
677 nasm_error(ERR_DEBUG
,
678 " elf_out line: %d type: %x seg: %"PRIx32
" segto: %"PRIx32
" bytes: %"PRIx64
" data: %"PRIx64
"\n",
679 currentline
, type
, segment
, segto
, size
, *(int64_t *)data
);
681 nasm_error(ERR_DEBUG
,
682 " elf_out line: %d type: %x seg: %"PRIx32
" segto: %"PRIx32
" bytes: %"PRIx64
"\n",
683 currentline
, type
, segment
, segto
, size
);
687 * handle absolute-assembly (structure definitions)
689 if (segto
== NO_SEG
) {
690 if (type
!= OUT_RESERVE
)
691 nasm_error(ERR_NONFATAL
, "attempt to assemble code in [ABSOLUTE]"
697 for (i
= 0; i
< nsects
; i
++)
698 if (segto
== sects
[i
]->index
) {
703 int tempint
; /* ignored */
704 if (segto
!= elf_section_names(".text", 2, &tempint
))
705 nasm_error(ERR_PANIC
, "strange segment conditions in ELF driver");
707 s
= sects
[nsects
- 1];
712 /* again some stabs debugging stuff */
713 if (of_elf64
.current_dfmt
) {
714 sinfo
.offset
= s
->len
;
717 sinfo
.name
= s
->name
;
718 of_elf64
.current_dfmt
->debug_output(TY_DEBUGSYMLIN
, &sinfo
);
720 /* end of debugging stuff */
722 if (s
->type
== SHT_NOBITS
&& type
!= OUT_RESERVE
) {
723 nasm_error(ERR_WARNING
, "attempt to initialize memory in"
724 " BSS section `%s': ignored", s
->name
);
725 s
->len
+= realsize(type
, size
);
731 if (s
->type
== SHT_PROGBITS
) {
732 nasm_error(ERR_WARNING
, "uninitialized space declared in"
733 " non-BSS section `%s': zeroing", s
->name
);
734 elf_sect_write(s
, NULL
, size
);
740 if (segment
!= NO_SEG
)
741 nasm_error(ERR_PANIC
, "OUT_RAWDATA with other than NO_SEG");
742 elf_sect_write(s
, data
, size
);
747 int isize
= (int)size
;
748 int asize
= abs((int)size
);
750 addr
= *(int64_t *)data
;
751 if (segment
== NO_SEG
) {
753 } else if (segment
% 2) {
754 nasm_error(ERR_NONFATAL
, "ELF format does not support"
755 " segment base references");
761 elf_add_reloc(s
, segment
, addr
, R_X86_64_8
);
765 elf_add_reloc(s
, segment
, addr
, R_X86_64_16
);
768 elf_add_reloc(s
, segment
, addr
, R_X86_64_32
);
771 elf_add_reloc(s
, segment
, addr
, R_X86_64_32S
);
775 elf_add_reloc(s
, segment
, addr
, R_X86_64_64
);
778 nasm_error(ERR_PANIC
, "internal error elf64-hpa-871");
782 } else if (wrt
== elf_gotpc_sect
+ 1) {
784 * The user will supply GOT relative to $$. ELF
785 * will let us have GOT relative to $. So we
786 * need to fix up the data item by $-$$.
789 elf_add_reloc(s
, segment
, addr
, R_X86_64_GOTPC32
);
791 } else if (wrt
== elf_gotoff_sect
+ 1) {
793 nasm_error(ERR_NONFATAL
, "ELF64 requires ..gotoff "
794 "references to be qword");
796 elf_add_reloc(s
, segment
, addr
, R_X86_64_GOTOFF64
);
799 } else if (wrt
== elf_got_sect
+ 1) {
802 elf_add_gsym_reloc(s
, segment
, addr
, 0,
803 R_X86_64_GOT32
, true);
807 elf_add_gsym_reloc(s
, segment
, addr
, 0,
808 R_X86_64_GOT64
, true);
812 nasm_error(ERR_NONFATAL
, "invalid ..got reference");
815 } else if (wrt
== elf_sym_sect
+ 1) {
819 elf_add_gsym_reloc(s
, segment
, addr
, 0,
825 elf_add_gsym_reloc(s
, segment
, addr
, 0,
830 elf_add_gsym_reloc(s
, segment
, addr
, 0,
835 elf_add_gsym_reloc(s
, segment
, addr
, 0,
836 R_X86_64_32S
, false);
841 elf_add_gsym_reloc(s
, segment
, addr
, 0,
846 nasm_error(ERR_PANIC
, "internal error elf64-hpa-903");
849 } else if (wrt
== elf_plt_sect
+ 1) {
850 nasm_error(ERR_NONFATAL
, "ELF format cannot produce non-PC-"
851 "relative PLT references");
853 nasm_error(ERR_NONFATAL
, "ELF format does not support this"
857 elf_sect_writeaddr(s
, addr
, asize
);
862 reltype
= R_X86_64_PC8
;
867 reltype
= R_X86_64_PC16
;
872 addr
= *(int64_t *)data
- size
;
873 if (segment
== segto
)
874 nasm_error(ERR_PANIC
, "intra-segment OUT_REL1ADR");
875 if (segment
== NO_SEG
) {
877 } else if (segment
% 2) {
878 nasm_error(ERR_NONFATAL
, "ELF format does not support"
879 " segment base references");
882 elf_add_reloc(s
, segment
, addr
, reltype
);
885 nasm_error(ERR_NONFATAL
,
886 "Unsupported non-32-bit ELF relocation");
889 elf_sect_writeaddr(s
, addr
, bytes
);
893 addr
= *(int64_t *)data
- size
;
894 if (segment
== segto
)
895 nasm_error(ERR_PANIC
, "intra-segment OUT_REL4ADR");
896 if (segment
== NO_SEG
) {
898 } else if (segment
% 2) {
899 nasm_error(ERR_NONFATAL
, "ELF64 format does not support"
900 " segment base references");
903 elf_add_reloc(s
, segment
, addr
, R_X86_64_PC32
);
905 } else if (wrt
== elf_plt_sect
+ 1) {
906 elf_add_gsym_reloc(s
, segment
, addr
+size
, size
,
907 R_X86_64_PLT32
, true);
909 } else if (wrt
== elf_gotpc_sect
+ 1 ||
910 wrt
== elf_got_sect
+ 1) {
911 elf_add_gsym_reloc(s
, segment
, addr
+size
, size
,
912 R_X86_64_GOTPCREL
, true);
914 } else if (wrt
== elf_gotoff_sect
+ 1 ||
915 wrt
== elf_got_sect
+ 1) {
916 nasm_error(ERR_NONFATAL
, "ELF64 requires ..gotoff references to be "
918 } else if (wrt
== elf_gottpoff_sect
+ 1) {
919 elf_add_gsym_reloc(s
, segment
, addr
+size
, size
,
920 R_X86_64_GOTTPOFF
, true);
923 nasm_error(ERR_NONFATAL
, "ELF64 format does not support this"
927 elf_sect_writeaddr(s
, addr
, 4);
931 addr
= *(int64_t *)data
- size
;
932 if (segment
== segto
)
933 nasm_error(ERR_PANIC
, "intra-segment OUT_REL8ADR");
934 if (segment
== NO_SEG
) {
936 } else if (segment
% 2) {
937 nasm_error(ERR_NONFATAL
, "ELF64 format does not support"
938 " segment base references");
941 elf_add_reloc(s
, segment
, addr
, R_X86_64_PC64
);
943 } else if (wrt
== elf_gotpc_sect
+ 1 ||
944 wrt
== elf_got_sect
+ 1) {
945 elf_add_gsym_reloc(s
, segment
, addr
+size
, size
,
946 R_X86_64_GOTPCREL64
, true);
948 } else if (wrt
== elf_gotoff_sect
+ 1 ||
949 wrt
== elf_got_sect
+ 1) {
950 nasm_error(ERR_NONFATAL
, "ELF64 requires ..gotoff references to be "
952 } else if (wrt
== elf_gottpoff_sect
+ 1) {
953 nasm_error(ERR_NONFATAL
, "ELF64 requires ..gottpoff references to be "
956 nasm_error(ERR_NONFATAL
, "ELF64 format does not support this"
960 elf_sect_writeaddr(s
, addr
, 8);
965 static void elf_write(void)
972 int32_t symtablen
, symtablocal
;
975 * Work out how many sections we will have. We have SHN_UNDEF,
976 * then the flexible user sections, then the fixed sections
977 * `.shstrtab', `.symtab' and `.strtab', then optionally
978 * relocation sections for the user sections.
980 nsections
= sec_numspecial
+ 1;
981 if (of_elf64
.current_dfmt
== &df_stabs
)
983 else if (of_elf64
.current_dfmt
== &df_dwarf
)
986 add_sectname("", ".shstrtab");
987 add_sectname("", ".symtab");
988 add_sectname("", ".strtab");
989 for (i
= 0; i
< nsects
; i
++) {
990 nsections
++; /* for the section itself */
991 if (sects
[i
]->head
) {
992 nsections
++; /* for its relocations */
993 add_sectname(".rela", sects
[i
]->name
);
997 if (of_elf64
.current_dfmt
== &df_stabs
) {
998 /* in case the debug information is wanted, just add these three sections... */
999 add_sectname("", ".stab");
1000 add_sectname("", ".stabstr");
1001 add_sectname(".rel", ".stab");
1004 else if (of_elf64
.current_dfmt
== &df_dwarf
) {
1005 /* the dwarf debug standard specifies the following ten sections,
1006 not all of which are currently implemented,
1007 although all of them are defined. */
1008 #define debug_aranges (int64_t) (nsections-10)
1009 #define debug_info (int64_t) (nsections-7)
1010 #define debug_abbrev (int64_t) (nsections-5)
1011 #define debug_line (int64_t) (nsections-4)
1012 add_sectname("", ".debug_aranges");
1013 add_sectname(".rela", ".debug_aranges");
1014 add_sectname("", ".debug_pubnames");
1015 add_sectname("", ".debug_info");
1016 add_sectname(".rela", ".debug_info");
1017 add_sectname("", ".debug_abbrev");
1018 add_sectname("", ".debug_line");
1019 add_sectname(".rela", ".debug_line");
1020 add_sectname("", ".debug_frame");
1021 add_sectname("", ".debug_loc");
1025 * Output the ELF header.
1027 nasm_write("\177ELF\2\1\1", 7, ofile
);
1028 fputc(elf_osabi
, ofile
);
1029 fputc(elf_abiver
, ofile
);
1030 fwritezero(7, ofile
);
1031 fwriteint16_t(ET_REL
, ofile
); /* relocatable file */
1032 fwriteint16_t(EM_X86_64
, ofile
); /* processor ID */
1033 fwriteint32_t(1L, ofile
); /* EV_CURRENT file format version */
1034 fwriteint64_t(0L, ofile
); /* no entry point */
1035 fwriteint64_t(0L, ofile
); /* no program header table */
1036 fwriteint64_t(0x40L
, ofile
); /* section headers straight after
1037 * ELF header plus alignment */
1038 fwriteint32_t(0L, ofile
); /* 386 defines no special flags */
1039 fwriteint16_t(0x40, ofile
); /* size of ELF header */
1040 fwriteint16_t(0, ofile
); /* no program header table, again */
1041 fwriteint16_t(0, ofile
); /* still no program header table */
1042 fwriteint16_t(sizeof(Elf64_Shdr
), ofile
); /* size of section header */
1043 fwriteint16_t(nsections
, ofile
); /* number of sections */
1044 fwriteint16_t(sec_shstrtab
, ofile
); /* string table section index for
1045 * section header table */
1048 * Build the symbol table and relocation tables.
1050 symtab
= elf_build_symtab(&symtablen
, &symtablocal
);
1051 for (i
= 0; i
< nsects
; i
++)
1053 sects
[i
]->rel
= elf_build_reltab(§s
[i
]->rellen
,
1057 * Now output the section header table.
1060 elf_foffs
= 0x40 + sizeof(Elf64_Shdr
) * nsections
;
1061 align
= ALIGN(elf_foffs
, SEC_FILEALIGN
) - elf_foffs
;
1064 elf_sects
= nasm_malloc(sizeof(*elf_sects
) * nsections
);
1067 elf_section_header(0, SHT_NULL
, 0, NULL
, false, 0, SHN_UNDEF
, 0, 0, 0);
1070 /* The normal sections */
1071 for (i
= 0; i
< nsects
; i
++) {
1072 elf_section_header(p
- shstrtab
, sects
[i
]->type
, sects
[i
]->flags
,
1073 (sects
[i
]->type
== SHT_PROGBITS
?
1074 sects
[i
]->data
: NULL
), true,
1075 sects
[i
]->len
, 0, 0, sects
[i
]->align
, 0);
1080 elf_section_header(p
- shstrtab
, SHT_STRTAB
, 0, shstrtab
, false,
1081 shstrtablen
, 0, 0, 1, 0);
1085 elf_section_header(p
- shstrtab
, SHT_SYMTAB
, 0, symtab
, true,
1086 symtablen
, sec_strtab
, symtablocal
, 8, 24);
1090 elf_section_header(p
- shstrtab
, SHT_STRTAB
, 0, strs
, true,
1091 strslen
, 0, 0, 1, 0);
1094 /* The relocation sections */
1095 for (i
= 0; i
< nsects
; i
++)
1096 if (sects
[i
]->head
) {
1097 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, sects
[i
]->rel
, true,
1098 sects
[i
]->rellen
, sec_symtab
, i
+ 1, 8, 24);
1102 if (of_elf64
.current_dfmt
== &df_stabs
) {
1103 /* for debugging information, create the last three sections
1104 which are the .stab , .stabstr and .rel.stab sections respectively */
1106 /* this function call creates the stab sections in memory */
1109 if (stabbuf
&& stabstrbuf
&& stabrelbuf
) {
1110 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, stabbuf
, false,
1111 stablen
, sec_stabstr
, 0, 4, 12);
1114 elf_section_header(p
- shstrtab
, SHT_STRTAB
, 0, stabstrbuf
, false,
1115 stabstrlen
, 0, 0, 4, 0);
1118 /* link -> symtable info -> section to refer to */
1119 elf_section_header(p
- shstrtab
, SHT_REL
, 0, stabrelbuf
, false,
1120 stabrellen
, symtabsection
, sec_stab
, 4, 16);
1123 } else if (of_elf64
.current_dfmt
== &df_dwarf
) {
1124 /* for dwarf debugging information, create the ten dwarf sections */
1126 /* this function call creates the dwarf sections in memory */
1130 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, arangesbuf
, false,
1131 arangeslen
, 0, 0, 1, 0);
1134 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, arangesrelbuf
, false,
1135 arangesrellen
, symtabsection
, debug_aranges
, 1, 24);
1138 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, pubnamesbuf
, false,
1139 pubnameslen
, 0, 0, 1, 0);
1142 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, infobuf
, false,
1143 infolen
, 0, 0, 1, 0);
1146 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, inforelbuf
, false,
1147 inforellen
, symtabsection
, debug_info
, 1, 24);
1150 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, abbrevbuf
, false,
1151 abbrevlen
, 0, 0, 1, 0);
1154 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, linebuf
, false,
1155 linelen
, 0, 0, 1, 0);
1158 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, linerelbuf
, false,
1159 linerellen
, symtabsection
, debug_line
, 1, 24);
1162 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, framebuf
, false,
1163 framelen
, 0, 0, 8, 0);
1166 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, locbuf
, false,
1167 loclen
, 0, 0, 1, 0);
1170 fwritezero(align
, ofile
);
1173 * Now output the sections.
1175 elf_write_sections();
1177 nasm_free(elf_sects
);
1181 static struct SAA
*elf_build_symtab(int32_t *len
, int32_t *local
)
1183 struct SAA
*s
= saa_init(1L);
1184 struct elf_symbol
*sym
;
1185 uint8_t entry
[24], *p
;
1191 * First, an all-zeros entry, required by the ELF spec.
1193 saa_wbytes(s
, NULL
, 24L); /* null symbol table entry */
1198 * Next, an entry for the file name.
1201 WRITELONG(p
, 1); /* we know it's 1st entry in strtab */
1202 WRITESHORT(p
, STT_FILE
); /* type FILE */
1203 WRITESHORT(p
, SHN_ABS
);
1204 WRITEDLONG(p
, (uint64_t) 0); /* no value */
1205 WRITEDLONG(p
, (uint64_t) 0); /* no size either */
1206 saa_wbytes(s
, entry
, 24L);
1211 * Now some standard symbols defining the segments, for relocation
1214 for (i
= 1; i
<= nsects
; i
++) {
1216 WRITELONG(p
, 0); /* no symbol name */
1217 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1218 WRITESHORT(p
, i
); /* section id */
1219 WRITEDLONG(p
, (uint64_t) 0); /* offset zero */
1220 WRITEDLONG(p
, (uint64_t) 0); /* size zero */
1221 saa_wbytes(s
, entry
, 24L);
1228 * Now the other local symbols.
1231 while ((sym
= saa_rstruct(syms
))) {
1232 if (sym
->type
& SYM_GLOBAL
)
1235 WRITELONG(p
, sym
->strpos
); /* index into symbol string table */
1236 WRITECHAR(p
, sym
->type
); /* type and binding */
1237 WRITECHAR(p
, sym
->other
); /* visibility */
1238 WRITESHORT(p
, sym
->section
); /* index into section header table */
1239 WRITEDLONG(p
, (int64_t)sym
->symv
.key
); /* value of symbol */
1240 WRITEDLONG(p
, (int64_t)sym
->size
); /* size of symbol */
1241 saa_wbytes(s
, entry
, 24L);
1246 * dwarf needs symbols for debug sections
1247 * which are relocation targets.
1249 if (of_elf64
.current_dfmt
== &df_dwarf
) {
1250 dwarf_infosym
= *local
;
1252 WRITELONG(p
, 0); /* no symbol name */
1253 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1254 WRITESHORT(p
, debug_info
); /* section id */
1255 WRITEDLONG(p
, (uint64_t) 0); /* offset zero */
1256 WRITEDLONG(p
, (uint64_t) 0); /* size zero */
1257 saa_wbytes(s
, entry
, 24L);
1260 dwarf_abbrevsym
= *local
;
1262 WRITELONG(p
, 0); /* no symbol name */
1263 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1264 WRITESHORT(p
, debug_abbrev
); /* section id */
1265 WRITEDLONG(p
, (uint64_t) 0); /* offset zero */
1266 WRITEDLONG(p
, (uint64_t) 0); /* size zero */
1267 saa_wbytes(s
, entry
, 24L);
1270 dwarf_linesym
= *local
;
1272 WRITELONG(p
, 0); /* no symbol name */
1273 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1274 WRITESHORT(p
, debug_line
); /* section id */
1275 WRITEDLONG(p
, (uint64_t) 0); /* offset zero */
1276 WRITEDLONG(p
, (uint64_t) 0); /* size zero */
1277 saa_wbytes(s
, entry
, 24L);
1283 * Now the global symbols.
1286 while ((sym
= saa_rstruct(syms
))) {
1287 if (!(sym
->type
& SYM_GLOBAL
))
1290 WRITELONG(p
, sym
->strpos
);
1291 WRITECHAR(p
, sym
->type
); /* type and binding */
1292 WRITECHAR(p
, sym
->other
); /* visibility */
1293 WRITESHORT(p
, sym
->section
);
1294 WRITEDLONG(p
, (int64_t)sym
->symv
.key
);
1295 WRITEDLONG(p
, (int64_t)sym
->size
);
1296 saa_wbytes(s
, entry
, 24L);
1303 static struct SAA
*elf_build_reltab(uint64_t *len
, struct elf_reloc
*r
)
1306 uint8_t *p
, entry
[24];
1307 int32_t global_offset
;
1316 * How to onvert from a global placeholder to a real symbol index;
1317 * the +2 refers to the two special entries, the null entry and
1318 * the filename entry.
1320 global_offset
= -GLOBAL_TEMP_BASE
+ nsects
+ nlocals
+ ndebugs
+ 2;
1323 int32_t sym
= r
->symbol
;
1325 if (sym
>= GLOBAL_TEMP_BASE
)
1326 sym
+= global_offset
;
1329 WRITEDLONG(p
, r
->address
);
1330 WRITELONG(p
, r
->type
);
1332 WRITEDLONG(p
, r
->offset
);
1333 saa_wbytes(s
, entry
, 24L);
1342 static void elf_section_header(int name
, int type
, uint64_t flags
,
1343 void *data
, bool is_saa
, uint64_t datalen
,
1344 int link
, int info
, int align
, int eltsize
)
1346 elf_sects
[elf_nsect
].data
= data
;
1347 elf_sects
[elf_nsect
].len
= datalen
;
1348 elf_sects
[elf_nsect
].is_saa
= is_saa
;
1351 fwriteint32_t((int32_t)name
, ofile
);
1352 fwriteint32_t((int32_t)type
, ofile
);
1353 fwriteint64_t((int64_t)flags
, ofile
);
1354 fwriteint64_t(0L, ofile
); /* no address, ever, in object files */
1355 fwriteint64_t(type
== 0 ? 0L : elf_foffs
, ofile
);
1356 fwriteint64_t(datalen
, ofile
);
1358 elf_foffs
+= ALIGN(datalen
, SEC_FILEALIGN
);
1359 fwriteint32_t((int32_t)link
, ofile
);
1360 fwriteint32_t((int32_t)info
, ofile
);
1361 fwriteint64_t((int64_t)align
, ofile
);
1362 fwriteint64_t((int64_t)eltsize
, ofile
);
1365 static void elf_write_sections(void)
1368 for (i
= 0; i
< elf_nsect
; i
++)
1369 if (elf_sects
[i
].data
) {
1370 int32_t len
= elf_sects
[i
].len
;
1371 int32_t reallen
= ALIGN(len
, SEC_FILEALIGN
);
1372 int32_t align
= reallen
- len
;
1373 if (elf_sects
[i
].is_saa
)
1374 saa_fpwrite(elf_sects
[i
].data
, ofile
);
1376 nasm_write(elf_sects
[i
].data
, len
, ofile
);
1377 fwritezero(align
, ofile
);
1381 static void elf_sect_write(struct elf_section
*sect
, const void *data
, size_t len
)
1383 saa_wbytes(sect
->data
, data
, len
);
1387 static void elf_sect_writeaddr(struct elf_section
*sect
, int64_t data
, size_t len
)
1389 saa_writeaddr(sect
->data
, data
, len
);
1393 static void elf_sectalign(int32_t seg
, unsigned int value
)
1395 struct elf_section
*s
= NULL
;
1398 for (i
= 0; i
< nsects
; i
++) {
1399 if (sects
[i
]->index
== seg
) {
1404 if (!s
|| !is_power2(value
))
1407 if (value
> s
->align
)
1411 static int32_t elf_segbase(int32_t segment
)
1416 static void elf_filename(char *inname
, char *outname
)
1418 strcpy(elf_module
, inname
);
1419 standard_extension(inname
, outname
, ".o");
1422 extern macros_t elf_stdmac
[];
1424 static int elf_set_info(enum geninfo type
, char **val
)
1430 static struct dfmt df_dwarf
= {
1431 "ELF64 (x86-64) dwarf debug format for Linux/Unix",
1441 static struct dfmt df_stabs
= {
1442 "ELF64 (x86-64) stabs debug format for Linux/Unix",
1453 struct dfmt
*elf64_debugs_arr
[3] = { &df_dwarf
, &df_stabs
, NULL
};
1455 struct ofmt of_elf64
= {
1456 "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, stabstrlen
);
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
;