1 /* ----------------------------------------------------------------------- *
3 * Copyright 1996-2016 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
52 #include "output/outform.h"
53 #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 const 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 uint8_t *stabbuf
= 0, *stabstrbuf
= 0, *stabrelbuf
= 0;
143 static int stablen
, stabstrlen
, stabrellen
;
145 /* dwarf debug variables */
146 static struct linelist
*dwarf_flist
= 0, *dwarf_clist
= 0, *dwarf_elist
= 0;
147 static struct sectlist
*dwarf_fsect
= 0, *dwarf_csect
= 0, *dwarf_esect
= 0;
148 static int dwarf_numfiles
= 0, dwarf_nsections
;
149 static uint8_t *arangesbuf
= 0, *arangesrelbuf
= 0, *pubnamesbuf
= 0, *infobuf
= 0, *inforelbuf
= 0,
150 *abbrevbuf
= 0, *linebuf
= 0, *linerelbuf
= 0, *framebuf
= 0, *locbuf
= 0;
151 static int8_t line_base
= -5, line_range
= 14, opcode_base
= 13;
152 static int arangeslen
, arangesrellen
, pubnameslen
, infolen
, inforellen
,
153 abbrevlen
, linelen
, linerellen
, framelen
, loclen
;
154 static int64_t dwarf_infosym
, dwarf_abbrevsym
, dwarf_linesym
;
156 static const struct dfmt df_dwarf
;
157 static const struct dfmt df_stabs
;
158 static struct elf_symbol
*lastsym
;
160 /* common debugging routines */
161 static void debug_typevalue(int32_t);
163 /* stabs debugging routines */
164 static void stabs_linenum(const char *filename
, int32_t linenumber
, int32_t);
165 static void stabs_output(int, void *);
166 static void stabs_generate(void);
167 static void stabs_cleanup(void);
169 /* dwarf debugging routines */
170 static void dwarf_init(void);
171 static void dwarf_linenum(const char *filename
, int32_t linenumber
, int32_t);
172 static void dwarf_output(int, void *);
173 static void dwarf_generate(void);
174 static void dwarf_cleanup(void);
175 static void dwarf_findfile(const char *);
176 static void dwarf_findsect(const int);
179 * Special NASM section numbers which are used to define ELF special
182 static int32_t elf_gotpc_sect
, elf_gotoff_sect
;
183 static int32_t elf_got_sect
, elf_plt_sect
;
184 static int32_t elf_sym_sect
, elf_gottpoff_sect
, elf_tlsie_sect
;
186 static void elf_init(void)
189 nsects
= sectlen
= 0;
190 syms
= saa_init((int32_t)sizeof(struct elf_symbol
));
191 nlocals
= nglobs
= ndebugs
= 0;
194 saa_wbytes(strs
, "\0", 1L);
195 saa_wbytes(strs
, elf_module
, strlen(elf_module
)+1);
196 strslen
= 2 + strlen(elf_module
);
198 shstrtablen
= shstrtabsize
= 0;;
199 add_sectname("", "");
203 elf_gotpc_sect
= seg_alloc();
204 define_label("..gotpc", elf_gotpc_sect
+ 1, 0L, NULL
, false, false);
205 elf_gotoff_sect
= seg_alloc();
206 define_label("..gotoff", elf_gotoff_sect
+ 1, 0L, NULL
, false, false);
207 elf_got_sect
= seg_alloc();
208 define_label("..got", elf_got_sect
+ 1, 0L, NULL
, false, false);
209 elf_plt_sect
= seg_alloc();
210 define_label("..plt", elf_plt_sect
+ 1, 0L, NULL
, false, false);
211 elf_sym_sect
= seg_alloc();
212 define_label("..sym", elf_sym_sect
+ 1, 0L, NULL
, false, false);
213 elf_gottpoff_sect
= seg_alloc();
214 define_label("..gottpoff", elf_gottpoff_sect
+ 1, 0L, NULL
, false, false);
216 def_seg
= seg_alloc();
219 static void elf_cleanup(void)
225 for (i
= 0; i
< nsects
; i
++) {
226 if (sects
[i
]->type
!= SHT_NOBITS
)
227 saa_free(sects
[i
]->data
);
229 saa_free(sects
[i
]->rel
);
230 while (sects
[i
]->head
) {
232 sects
[i
]->head
= sects
[i
]->head
->next
;
243 /* add entry to the elf .shstrtab section */
244 static void add_sectname(char *firsthalf
, char *secondhalf
)
246 int len
= strlen(firsthalf
) + strlen(secondhalf
);
247 while (shstrtablen
+ len
+ 1 > shstrtabsize
)
248 shstrtab
= nasm_realloc(shstrtab
, (shstrtabsize
+= SHSTR_DELTA
));
249 strcpy(shstrtab
+ shstrtablen
, firsthalf
);
250 strcat(shstrtab
+ shstrtablen
, secondhalf
);
251 shstrtablen
+= len
+ 1;
254 static int elf_make_section(char *name
, int type
, int flags
, int align
)
256 struct elf_section
*s
;
258 s
= nasm_zalloc(sizeof(*s
));
260 if (type
!= SHT_NOBITS
)
261 s
->data
= saa_init(1L);
263 if (!strcmp(name
, ".text"))
266 s
->index
= seg_alloc();
267 add_sectname("", name
);
269 s
->name
= nasm_strdup(name
);
274 if (nsects
>= sectlen
)
275 sects
= nasm_realloc(sects
, (sectlen
+= SECT_DELTA
) * sizeof(*sects
));
281 static int32_t elf_section_names(char *name
, int pass
, int *bits
)
284 uint32_t flags
, flags_and
, flags_or
;
289 *bits
= ofmt
->maxbits
;
293 p
= nasm_skip_word(name
);
296 flags_and
= flags_or
= type
= align
= 0;
298 elf_section_attrib(name
, p
, pass
, &flags_and
,
299 &flags_or
, &align
, &type
);
301 if (!strcmp(name
, ".shstrtab") ||
302 !strcmp(name
, ".symtab") ||
303 !strcmp(name
, ".strtab")) {
304 nasm_error(ERR_NONFATAL
, "attempt to redefine reserved section"
309 for (i
= 0; i
< nsects
; i
++)
310 if (!strcmp(name
, sects
[i
]->name
))
313 const struct elf_known_section
*ks
= elf_known_sections
;
316 if (!strcmp(name
, ks
->name
))
321 type
= type
? type
: ks
->type
;
322 align
= align
? align
: ks
->align
;
323 flags
= (ks
->flags
& ~flags_and
) | flags_or
;
325 i
= elf_make_section(name
, type
, flags
, align
);
326 } else if (pass
== 1) {
327 if ((type
&& sects
[i
]->type
!= type
)
328 || (align
&& sects
[i
]->align
!= align
)
329 || (flags_and
&& ((sects
[i
]->flags
& flags_and
) != flags_or
)))
330 nasm_error(ERR_WARNING
, "incompatible section attributes ignored on"
331 " redeclaration of section `%s'", name
);
334 return sects
[i
]->index
;
337 static void elf_deflabel(char *name
, int32_t segment
, int64_t offset
,
338 int is_global
, char *special
)
341 struct elf_symbol
*sym
;
342 bool special_used
= false;
344 #if defined(DEBUG) && DEBUG>2
345 nasm_error(ERR_DEBUG
,
346 " elf_deflabel: %s, seg=%"PRIx32
", off=%"PRIx64
", is_global=%d, %s\n",
347 name
, segment
, offset
, is_global
, special
);
349 if (name
[0] == '.' && name
[1] == '.' && name
[2] != '@') {
351 * This is a NASM special symbol. We never allow it into
352 * the ELF symbol table, even if it's a valid one. If it
353 * _isn't_ a valid one, we should barf immediately.
355 if (strcmp(name
, "..gotpc") && strcmp(name
, "..gotoff") &&
356 strcmp(name
, "..got") && strcmp(name
, "..plt") &&
357 strcmp(name
, "..sym") && strcmp(name
, "..gottpoff"))
358 nasm_error(ERR_NONFATAL
, "unrecognised special symbol `%s'", name
);
362 if (is_global
== 3) {
363 struct elf_symbol
**s
;
365 * Fix up a forward-reference symbol size from the first
368 for (s
= &fwds
; *s
; s
= &(*s
)->nextfwd
)
369 if (!strcmp((*s
)->name
, name
)) {
370 struct tokenval tokval
;
372 char *p
= nasm_skip_spaces(nasm_skip_word(special
));
376 tokval
.t_type
= TOKEN_INVALID
;
377 e
= evaluate(stdscan
, NULL
, &tokval
, NULL
, 1, NULL
);
380 nasm_error(ERR_NONFATAL
, "cannot use relocatable"
381 " expression as symbol size");
383 (*s
)->size
= reloc_value(e
);
387 * Remove it from the list of unresolved sizes.
389 nasm_free((*s
)->name
);
393 return; /* it wasn't an important one */
396 saa_wbytes(strs
, name
, (int32_t)(1 + strlen(name
)));
397 strslen
+= 1 + strlen(name
);
399 lastsym
= sym
= saa_wstruct(syms
);
401 memset(&sym
->symv
, 0, sizeof(struct rbtree
));
404 sym
->type
= is_global
? SYM_GLOBAL
: SYM_LOCAL
;
405 sym
->other
= STV_DEFAULT
;
407 if (segment
== NO_SEG
)
408 sym
->section
= SHN_ABS
;
411 sym
->section
= SHN_UNDEF
;
412 if (segment
== def_seg
) {
413 /* we have to be sure at least text section is there */
415 if (segment
!= elf_section_names(".text", 2, &tempint
))
416 nasm_panic(0, "strange segment conditions in ELF driver");
418 for (i
= 0; i
< nsects
; i
++) {
419 if (segment
== sects
[i
]->index
) {
420 sym
->section
= i
+ 1;
426 if (is_global
== 2) {
429 sym
->section
= SHN_COMMON
;
431 * We have a common variable. Check the special text to see
432 * if it's a valid number and power of two; if so, store it
433 * as the alignment for the common variable.
437 sym
->symv
.key
= readnum(special
, &err
);
439 nasm_error(ERR_NONFATAL
, "alignment constraint `%s' is not a"
440 " valid number", special
);
441 else if ((sym
->symv
.key
| (sym
->symv
.key
- 1)) != 2 * sym
->symv
.key
- 1)
442 nasm_error(ERR_NONFATAL
, "alignment constraint `%s' is not a"
443 " power of two", special
);
447 sym
->symv
.key
= (sym
->section
== SHN_UNDEF
? 0 : offset
);
449 if (sym
->type
== SYM_GLOBAL
) {
451 * If sym->section == SHN_ABS, then the first line of the
452 * else section would cause a core dump, because its a reference
453 * beyond the end of the section array.
454 * This behaviour is exhibited by this code:
457 * To avoid such a crash, such requests are silently discarded.
458 * This may not be the best solution.
460 if (sym
->section
== SHN_UNDEF
|| sym
->section
== SHN_COMMON
) {
461 bsym
= raa_write(bsym
, segment
, nglobs
);
462 } else if (sym
->section
!= SHN_ABS
) {
464 * This is a global symbol; so we must add it to the rbtree
465 * of global symbols in its section.
467 * In addition, we check the special text for symbol
468 * type and size information.
470 sects
[sym
->section
-1]->gsyms
=
471 rb_insert(sects
[sym
->section
-1]->gsyms
, &sym
->symv
);
474 int n
= strcspn(special
, " \t");
476 if (!nasm_strnicmp(special
, "function", n
))
477 sym
->type
|= STT_FUNC
;
478 else if (!nasm_strnicmp(special
, "data", n
) ||
479 !nasm_strnicmp(special
, "object", n
))
480 sym
->type
|= STT_OBJECT
;
481 else if (!nasm_strnicmp(special
, "notype", n
))
482 sym
->type
|= STT_NOTYPE
;
484 nasm_error(ERR_NONFATAL
, "unrecognised symbol type `%.*s'",
488 special
= nasm_skip_spaces(special
);
490 n
= strcspn(special
, " \t");
491 if (!nasm_strnicmp(special
, "default", n
))
492 sym
->other
= STV_DEFAULT
;
493 else if (!nasm_strnicmp(special
, "internal", n
))
494 sym
->other
= STV_INTERNAL
;
495 else if (!nasm_strnicmp(special
, "hidden", n
))
496 sym
->other
= STV_HIDDEN
;
497 else if (!nasm_strnicmp(special
, "protected", n
))
498 sym
->other
= STV_PROTECTED
;
505 struct tokenval tokval
;
508 char *saveme
= stdscan_get();
510 while (special
[n
] && nasm_isspace(special
[n
]))
513 * We have a size expression; attempt to
517 stdscan_set(special
+ n
);
518 tokval
.t_type
= TOKEN_INVALID
;
519 e
= evaluate(stdscan
, NULL
, &tokval
, &fwd
, 0, NULL
);
523 sym
->name
= nasm_strdup(name
);
526 nasm_error(ERR_NONFATAL
, "cannot use relocatable"
527 " expression as symbol size");
529 sym
->size
= reloc_value(e
);
536 * If TLS segment, mark symbol accordingly.
538 if (sects
[sym
->section
- 1]->flags
& SHF_TLS
) {
540 sym
->type
|= STT_TLS
;
543 sym
->globnum
= nglobs
;
548 if (special
&& !special_used
)
549 nasm_error(ERR_NONFATAL
, "no special symbol features supported here");
552 static void elf_add_reloc(struct elf_section
*sect
, int32_t segment
,
553 int64_t offset
, int type
)
557 r
= *sect
->tail
= nasm_zalloc(sizeof(struct elf_reloc
));
558 sect
->tail
= &r
->next
;
560 r
->address
= sect
->len
;
563 if (segment
!= NO_SEG
) {
565 for (i
= 0; i
< nsects
; i
++)
566 if (segment
== sects
[i
]->index
)
569 r
->symbol
= GLOBAL_TEMP_BASE
+ raa_read(bsym
, segment
);
577 * This routine deals with ..got and ..sym relocations: the more
578 * complicated kinds. In shared-library writing, some relocations
579 * with respect to global symbols must refer to the precise symbol
580 * rather than referring to an offset from the base of the section
581 * _containing_ the symbol. Such relocations call to this routine,
582 * which searches the symbol list for the symbol in question.
584 * R_X86_64_GOT32 references require the _exact_ symbol address to be
585 * used; R_X86_64_32 references can be at an offset from the symbol.
586 * The boolean argument `exact' tells us this.
588 * Return value is the adjusted value of `addr', having become an
589 * offset from the symbol rather than the section. Should always be
590 * zero when returning from an exact call.
592 * Limitation: if you define two symbols at the same place,
593 * confusion will occur.
595 * Inefficiency: we search, currently, using a linked list which
596 * isn't even necessarily sorted.
598 static void elf_add_gsym_reloc(struct elf_section
*sect
,
599 int32_t segment
, uint64_t offset
, int64_t pcrel
,
600 int type
, bool exact
)
603 struct elf_section
*s
;
604 struct elf_symbol
*sym
;
609 * First look up the segment/offset pair and find a global
610 * symbol corresponding to it. If it's not one of our segments,
611 * then it must be an external symbol, in which case we're fine
612 * doing a normal elf_add_reloc after first sanity-checking
613 * that the offset from the symbol is zero.
616 for (i
= 0; i
< nsects
; i
++)
617 if (segment
== sects
[i
]->index
) {
624 nasm_error(ERR_NONFATAL
, "invalid access to an external symbol");
626 elf_add_reloc(sect
, segment
, offset
- pcrel
, type
);
630 srb
= rb_search(s
->gsyms
, offset
);
631 if (!srb
|| (exact
&& srb
->key
!= offset
)) {
632 nasm_error(ERR_NONFATAL
, "unable to find a suitable global symbol"
633 " for this reference");
636 sym
= container_of(srb
, struct elf_symbol
, symv
);
638 r
= *sect
->tail
= nasm_malloc(sizeof(struct elf_reloc
));
639 sect
->tail
= &r
->next
;
642 r
->address
= sect
->len
;
643 r
->offset
= offset
- pcrel
- sym
->symv
.key
;
644 r
->symbol
= GLOBAL_TEMP_BASE
+ sym
->globnum
;
650 static void elf_out(int32_t segto
, const void *data
,
651 enum out_type type
, uint64_t size
,
652 int32_t segment
, int32_t wrt
)
654 struct elf_section
*s
;
658 static struct symlininfo sinfo
;
660 #if defined(DEBUG) && DEBUG>2
662 nasm_error(ERR_DEBUG
,
663 " elf_out line: %d type: %x seg: %"PRIx32
" segto: %"PRIx32
" bytes: %"PRIx64
" data: %"PRIx64
"\n",
664 currentline
, type
, segment
, segto
, size
, *(int64_t *)data
);
666 nasm_error(ERR_DEBUG
,
667 " elf_out line: %d type: %x seg: %"PRIx32
" segto: %"PRIx32
" bytes: %"PRIx64
"\n",
668 currentline
, type
, segment
, segto
, size
);
672 * handle absolute-assembly (structure definitions)
674 if (segto
== NO_SEG
) {
675 if (type
!= OUT_RESERVE
)
676 nasm_error(ERR_NONFATAL
, "attempt to assemble code in [ABSOLUTE]"
682 for (i
= 0; i
< nsects
; i
++)
683 if (segto
== sects
[i
]->index
) {
688 int tempint
; /* ignored */
689 if (segto
!= elf_section_names(".text", 2, &tempint
))
690 nasm_panic(0, "strange segment conditions in ELF driver");
692 s
= sects
[nsects
- 1];
697 /* again some stabs debugging stuff */
698 sinfo
.offset
= s
->len
;
701 sinfo
.name
= s
->name
;
702 dfmt
->debug_output(TY_DEBUGSYMLIN
, &sinfo
);
703 /* end of debugging stuff */
705 if (s
->type
== SHT_NOBITS
&& type
!= OUT_RESERVE
) {
706 nasm_error(ERR_WARNING
, "attempt to initialize memory in"
707 " BSS section `%s': ignored", s
->name
);
708 s
->len
+= realsize(type
, size
);
714 if (s
->type
== SHT_PROGBITS
) {
715 nasm_error(ERR_WARNING
, "uninitialized space declared in"
716 " non-BSS section `%s': zeroing", s
->name
);
717 elf_sect_write(s
, NULL
, size
);
723 if (segment
!= NO_SEG
)
724 nasm_panic(0, "OUT_RAWDATA with other than NO_SEG");
725 elf_sect_write(s
, data
, size
);
730 int isize
= (int)size
;
731 int asize
= abs((int)size
);
733 addr
= *(int64_t *)data
;
734 if (segment
== NO_SEG
) {
736 } else if (segment
% 2) {
737 nasm_error(ERR_NONFATAL
, "ELF format does not support"
738 " segment base references");
744 elf_add_reloc(s
, segment
, addr
, R_X86_64_8
);
748 elf_add_reloc(s
, segment
, addr
, R_X86_64_16
);
751 elf_add_reloc(s
, segment
, addr
, R_X86_64_32
);
754 elf_add_reloc(s
, segment
, addr
, R_X86_64_32S
);
758 elf_add_reloc(s
, segment
, addr
, R_X86_64_64
);
761 nasm_panic(0, "internal error elf64-hpa-871");
765 } else if (wrt
== elf_gotpc_sect
+ 1) {
767 * The user will supply GOT relative to $$. ELF
768 * will let us have GOT relative to $. So we
769 * need to fix up the data item by $-$$.
772 elf_add_reloc(s
, segment
, addr
, R_X86_64_GOTPC32
);
774 } else if (wrt
== elf_gotoff_sect
+ 1) {
776 nasm_error(ERR_NONFATAL
, "ELF64 requires ..gotoff "
777 "references to be qword");
779 elf_add_reloc(s
, segment
, addr
, R_X86_64_GOTOFF64
);
782 } else if (wrt
== elf_got_sect
+ 1) {
785 elf_add_gsym_reloc(s
, segment
, addr
, 0,
786 R_X86_64_GOT32
, true);
790 elf_add_gsym_reloc(s
, segment
, addr
, 0,
791 R_X86_64_GOT64
, true);
795 nasm_error(ERR_NONFATAL
, "invalid ..got reference");
798 } else if (wrt
== elf_sym_sect
+ 1) {
802 elf_add_gsym_reloc(s
, segment
, addr
, 0,
808 elf_add_gsym_reloc(s
, segment
, addr
, 0,
813 elf_add_gsym_reloc(s
, segment
, addr
, 0,
818 elf_add_gsym_reloc(s
, segment
, addr
, 0,
819 R_X86_64_32S
, false);
824 elf_add_gsym_reloc(s
, segment
, addr
, 0,
829 nasm_panic(0, "internal error elf64-hpa-903");
832 } else if (wrt
== elf_plt_sect
+ 1) {
833 nasm_error(ERR_NONFATAL
, "ELF format cannot produce non-PC-"
834 "relative PLT references");
836 nasm_error(ERR_NONFATAL
, "ELF format does not support this"
840 elf_sect_writeaddr(s
, addr
, asize
);
845 reltype
= R_X86_64_PC8
;
850 reltype
= R_X86_64_PC16
;
855 addr
= *(int64_t *)data
- size
;
856 if (segment
== segto
)
857 nasm_panic(0, "intra-segment OUT_REL1ADR");
858 if (segment
== NO_SEG
) {
860 } else if (segment
% 2) {
861 nasm_error(ERR_NONFATAL
, "ELF format does not support"
862 " segment base references");
865 elf_add_reloc(s
, segment
, addr
, reltype
);
868 nasm_error(ERR_NONFATAL
,
869 "Unsupported non-32-bit ELF relocation");
872 elf_sect_writeaddr(s
, addr
, bytes
);
876 addr
= *(int64_t *)data
- size
;
877 if (segment
== segto
)
878 nasm_panic(0, "intra-segment OUT_REL4ADR");
879 if (segment
== NO_SEG
) {
881 } else if (segment
% 2) {
882 nasm_error(ERR_NONFATAL
, "ELF64 format does not support"
883 " segment base references");
886 elf_add_reloc(s
, segment
, addr
, R_X86_64_PC32
);
888 } else if (wrt
== elf_plt_sect
+ 1) {
889 elf_add_gsym_reloc(s
, segment
, addr
+size
, size
,
890 R_X86_64_PLT32
, true);
892 } else if (wrt
== elf_gotpc_sect
+ 1 ||
893 wrt
== elf_got_sect
+ 1) {
894 elf_add_gsym_reloc(s
, segment
, addr
+size
, size
,
895 R_X86_64_GOTPCREL
, true);
897 } else if (wrt
== elf_gotoff_sect
+ 1 ||
898 wrt
== elf_got_sect
+ 1) {
899 nasm_error(ERR_NONFATAL
, "ELF64 requires ..gotoff references to be "
901 } else if (wrt
== elf_gottpoff_sect
+ 1) {
902 elf_add_gsym_reloc(s
, segment
, addr
+size
, size
,
903 R_X86_64_GOTTPOFF
, true);
906 nasm_error(ERR_NONFATAL
, "ELF64 format does not support this"
910 elf_sect_writeaddr(s
, addr
, 4);
914 addr
= *(int64_t *)data
- size
;
915 if (segment
== segto
)
916 nasm_panic(0, "intra-segment OUT_REL8ADR");
917 if (segment
== NO_SEG
) {
919 } else if (segment
% 2) {
920 nasm_error(ERR_NONFATAL
, "ELF64 format does not support"
921 " segment base references");
924 elf_add_reloc(s
, segment
, addr
, R_X86_64_PC64
);
926 } else if (wrt
== elf_gotpc_sect
+ 1 ||
927 wrt
== elf_got_sect
+ 1) {
928 elf_add_gsym_reloc(s
, segment
, addr
+size
, size
,
929 R_X86_64_GOTPCREL64
, true);
931 } else if (wrt
== elf_gotoff_sect
+ 1 ||
932 wrt
== elf_got_sect
+ 1) {
933 nasm_error(ERR_NONFATAL
, "ELF64 requires ..gotoff references to be "
935 } else if (wrt
== elf_gottpoff_sect
+ 1) {
936 nasm_error(ERR_NONFATAL
, "ELF64 requires ..gottpoff references to be "
939 nasm_error(ERR_NONFATAL
, "ELF64 format does not support this"
943 elf_sect_writeaddr(s
, addr
, 8);
948 static void elf_write(void)
955 int32_t symtablen
, symtablocal
;
958 * Work out how many sections we will have. We have SHN_UNDEF,
959 * then the flexible user sections, then the fixed sections
960 * `.shstrtab', `.symtab' and `.strtab', then optionally
961 * relocation sections for the user sections.
963 nsections
= sec_numspecial
+ 1;
964 if (dfmt
== &df_stabs
)
966 else if (dfmt
== &df_dwarf
)
969 add_sectname("", ".shstrtab");
970 add_sectname("", ".symtab");
971 add_sectname("", ".strtab");
972 for (i
= 0; i
< nsects
; i
++) {
973 nsections
++; /* for the section itself */
974 if (sects
[i
]->head
) {
975 nsections
++; /* for its relocations */
976 add_sectname(".rela", sects
[i
]->name
);
980 if (dfmt
== &df_stabs
) {
981 /* in case the debug information is wanted, just add these three sections... */
982 add_sectname("", ".stab");
983 add_sectname("", ".stabstr");
984 add_sectname(".rel", ".stab");
985 } else if (dfmt
== &df_dwarf
) {
986 /* the dwarf debug standard specifies the following ten sections,
987 not all of which are currently implemented,
988 although all of them are defined. */
989 #define debug_aranges (int64_t) (nsections-10)
990 #define debug_info (int64_t) (nsections-7)
991 #define debug_abbrev (int64_t) (nsections-5)
992 #define debug_line (int64_t) (nsections-4)
993 add_sectname("", ".debug_aranges");
994 add_sectname(".rela", ".debug_aranges");
995 add_sectname("", ".debug_pubnames");
996 add_sectname("", ".debug_info");
997 add_sectname(".rela", ".debug_info");
998 add_sectname("", ".debug_abbrev");
999 add_sectname("", ".debug_line");
1000 add_sectname(".rela", ".debug_line");
1001 add_sectname("", ".debug_frame");
1002 add_sectname("", ".debug_loc");
1006 * Output the ELF header.
1008 nasm_write("\177ELF\2\1\1", 7, ofile
);
1009 fputc(elf_osabi
, ofile
);
1010 fputc(elf_abiver
, ofile
);
1011 fwritezero(7, ofile
);
1012 fwriteint16_t(ET_REL
, ofile
); /* relocatable file */
1013 fwriteint16_t(EM_X86_64
, ofile
); /* processor ID */
1014 fwriteint32_t(1L, ofile
); /* EV_CURRENT file format version */
1015 fwriteint64_t(0L, ofile
); /* no entry point */
1016 fwriteint64_t(0L, ofile
); /* no program header table */
1017 fwriteint64_t(0x40L
, ofile
); /* section headers straight after
1018 * ELF header plus alignment */
1019 fwriteint32_t(0L, ofile
); /* 386 defines no special flags */
1020 fwriteint16_t(0x40, ofile
); /* size of ELF header */
1021 fwriteint16_t(0, ofile
); /* no program header table, again */
1022 fwriteint16_t(0, ofile
); /* still no program header table */
1023 fwriteint16_t(sizeof(Elf64_Shdr
), ofile
); /* size of section header */
1024 fwriteint16_t(nsections
, ofile
); /* number of sections */
1025 fwriteint16_t(sec_shstrtab
, ofile
); /* string table section index for
1026 * section header table */
1029 * Build the symbol table and relocation tables.
1031 symtab
= elf_build_symtab(&symtablen
, &symtablocal
);
1032 for (i
= 0; i
< nsects
; i
++)
1034 sects
[i
]->rel
= elf_build_reltab(§s
[i
]->rellen
,
1038 * Now output the section header table.
1041 elf_foffs
= 0x40 + sizeof(Elf64_Shdr
) * nsections
;
1042 align
= ALIGN(elf_foffs
, SEC_FILEALIGN
) - elf_foffs
;
1045 elf_sects
= nasm_malloc(sizeof(*elf_sects
) * nsections
);
1048 elf_section_header(0, SHT_NULL
, 0, NULL
, false, 0, SHN_UNDEF
, 0, 0, 0);
1051 /* The normal sections */
1052 for (i
= 0; i
< nsects
; i
++) {
1053 elf_section_header(p
- shstrtab
, sects
[i
]->type
, sects
[i
]->flags
,
1054 (sects
[i
]->type
== SHT_PROGBITS
?
1055 sects
[i
]->data
: NULL
), true,
1056 sects
[i
]->len
, 0, 0, sects
[i
]->align
, 0);
1061 elf_section_header(p
- shstrtab
, SHT_STRTAB
, 0, shstrtab
, false,
1062 shstrtablen
, 0, 0, 1, 0);
1066 elf_section_header(p
- shstrtab
, SHT_SYMTAB
, 0, symtab
, true,
1067 symtablen
, sec_strtab
, symtablocal
, 8, 24);
1071 elf_section_header(p
- shstrtab
, SHT_STRTAB
, 0, strs
, true,
1072 strslen
, 0, 0, 1, 0);
1075 /* The relocation sections */
1076 for (i
= 0; i
< nsects
; i
++)
1077 if (sects
[i
]->head
) {
1078 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, sects
[i
]->rel
, true,
1079 sects
[i
]->rellen
, sec_symtab
, i
+ 1, 8, 24);
1083 if (dfmt
== &df_stabs
) {
1084 /* for debugging information, create the last three sections
1085 which are the .stab , .stabstr and .rel.stab sections respectively */
1087 /* this function call creates the stab sections in memory */
1090 if (stabbuf
&& stabstrbuf
&& stabrelbuf
) {
1091 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, stabbuf
, false,
1092 stablen
, sec_stabstr
, 0, 4, 12);
1095 elf_section_header(p
- shstrtab
, SHT_STRTAB
, 0, stabstrbuf
, false,
1096 stabstrlen
, 0, 0, 4, 0);
1099 /* link -> symtable info -> section to refer to */
1100 elf_section_header(p
- shstrtab
, SHT_REL
, 0, stabrelbuf
, false,
1101 stabrellen
, sec_symtab
, sec_stab
, 4, 16);
1104 } else if (dfmt
== &df_dwarf
) {
1105 /* for dwarf debugging information, create the ten dwarf sections */
1107 /* this function call creates the dwarf sections in memory */
1111 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, arangesbuf
, false,
1112 arangeslen
, 0, 0, 1, 0);
1115 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, arangesrelbuf
, false,
1116 arangesrellen
, sec_symtab
, debug_aranges
, 1, 24);
1119 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, pubnamesbuf
, false,
1120 pubnameslen
, 0, 0, 1, 0);
1123 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, infobuf
, false,
1124 infolen
, 0, 0, 1, 0);
1127 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, inforelbuf
, false,
1128 inforellen
, sec_symtab
, debug_info
, 1, 24);
1131 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, abbrevbuf
, false,
1132 abbrevlen
, 0, 0, 1, 0);
1135 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, linebuf
, false,
1136 linelen
, 0, 0, 1, 0);
1139 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, linerelbuf
, false,
1140 linerellen
, sec_symtab
, debug_line
, 1, 24);
1143 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, framebuf
, false,
1144 framelen
, 0, 0, 8, 0);
1147 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, locbuf
, false,
1148 loclen
, 0, 0, 1, 0);
1151 fwritezero(align
, ofile
);
1154 * Now output the sections.
1156 elf_write_sections();
1158 nasm_free(elf_sects
);
1162 static struct SAA
*elf_build_symtab(int32_t *len
, int32_t *local
)
1164 struct SAA
*s
= saa_init(1L);
1165 struct elf_symbol
*sym
;
1166 uint8_t entry
[24], *p
;
1172 * First, an all-zeros entry, required by the ELF spec.
1174 saa_wbytes(s
, NULL
, 24L); /* null symbol table entry */
1179 * Next, an entry for the file name.
1182 WRITELONG(p
, 1); /* we know it's 1st entry in strtab */
1183 WRITESHORT(p
, STT_FILE
); /* type FILE */
1184 WRITESHORT(p
, SHN_ABS
);
1185 WRITEDLONG(p
, (uint64_t) 0); /* no value */
1186 WRITEDLONG(p
, (uint64_t) 0); /* no size either */
1187 saa_wbytes(s
, entry
, 24L);
1192 * Now some standard symbols defining the segments, for relocation
1195 for (i
= 1; i
<= nsects
; i
++) {
1197 WRITELONG(p
, 0); /* no symbol name */
1198 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1199 WRITESHORT(p
, i
); /* section id */
1200 WRITEDLONG(p
, (uint64_t) 0); /* offset zero */
1201 WRITEDLONG(p
, (uint64_t) 0); /* size zero */
1202 saa_wbytes(s
, entry
, 24L);
1208 * Now the other local symbols.
1211 while ((sym
= saa_rstruct(syms
))) {
1212 if (sym
->type
& SYM_GLOBAL
)
1215 WRITELONG(p
, sym
->strpos
); /* index into symbol string table */
1216 WRITECHAR(p
, sym
->type
); /* type and binding */
1217 WRITECHAR(p
, sym
->other
); /* visibility */
1218 WRITESHORT(p
, sym
->section
); /* index into section header table */
1219 WRITEDLONG(p
, (int64_t)sym
->symv
.key
); /* value of symbol */
1220 WRITEDLONG(p
, (int64_t)sym
->size
); /* size of symbol */
1221 saa_wbytes(s
, entry
, 24L);
1226 * dwarf needs symbols for debug sections
1227 * which are relocation targets.
1229 if (dfmt
== &df_dwarf
) {
1230 dwarf_infosym
= *local
;
1232 WRITELONG(p
, 0); /* no symbol name */
1233 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1234 WRITESHORT(p
, debug_info
); /* section id */
1235 WRITEDLONG(p
, (uint64_t) 0); /* offset zero */
1236 WRITEDLONG(p
, (uint64_t) 0); /* size zero */
1237 saa_wbytes(s
, entry
, 24L);
1240 dwarf_abbrevsym
= *local
;
1242 WRITELONG(p
, 0); /* no symbol name */
1243 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1244 WRITESHORT(p
, debug_abbrev
); /* section id */
1245 WRITEDLONG(p
, (uint64_t) 0); /* offset zero */
1246 WRITEDLONG(p
, (uint64_t) 0); /* size zero */
1247 saa_wbytes(s
, entry
, 24L);
1250 dwarf_linesym
= *local
;
1252 WRITELONG(p
, 0); /* no symbol name */
1253 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1254 WRITESHORT(p
, debug_line
); /* section id */
1255 WRITEDLONG(p
, (uint64_t) 0); /* offset zero */
1256 WRITEDLONG(p
, (uint64_t) 0); /* size zero */
1257 saa_wbytes(s
, entry
, 24L);
1263 * Now the global symbols.
1266 while ((sym
= saa_rstruct(syms
))) {
1267 if (!(sym
->type
& SYM_GLOBAL
))
1270 WRITELONG(p
, sym
->strpos
);
1271 WRITECHAR(p
, sym
->type
); /* type and binding */
1272 WRITECHAR(p
, sym
->other
); /* visibility */
1273 WRITESHORT(p
, sym
->section
);
1274 WRITEDLONG(p
, (int64_t)sym
->symv
.key
);
1275 WRITEDLONG(p
, (int64_t)sym
->size
);
1276 saa_wbytes(s
, entry
, 24L);
1283 static struct SAA
*elf_build_reltab(uint64_t *len
, struct elf_reloc
*r
)
1286 uint8_t *p
, entry
[24];
1287 int32_t global_offset
;
1296 * How to onvert from a global placeholder to a real symbol index;
1297 * the +2 refers to the two special entries, the null entry and
1298 * the filename entry.
1300 global_offset
= -GLOBAL_TEMP_BASE
+ nsects
+ nlocals
+ ndebugs
+ 2;
1303 int32_t sym
= r
->symbol
;
1305 if (sym
>= GLOBAL_TEMP_BASE
)
1306 sym
+= global_offset
;
1309 WRITEDLONG(p
, r
->address
);
1310 WRITELONG(p
, r
->type
);
1312 WRITEDLONG(p
, r
->offset
);
1313 saa_wbytes(s
, entry
, 24L);
1322 static void elf_section_header(int name
, int type
, uint64_t flags
,
1323 void *data
, bool is_saa
, uint64_t datalen
,
1324 int link
, int info
, int align
, int eltsize
)
1326 elf_sects
[elf_nsect
].data
= data
;
1327 elf_sects
[elf_nsect
].len
= datalen
;
1328 elf_sects
[elf_nsect
].is_saa
= is_saa
;
1331 fwriteint32_t((int32_t)name
, ofile
);
1332 fwriteint32_t((int32_t)type
, ofile
);
1333 fwriteint64_t((int64_t)flags
, ofile
);
1334 fwriteint64_t(0L, ofile
); /* no address, ever, in object files */
1335 fwriteint64_t(type
== 0 ? 0L : elf_foffs
, ofile
);
1336 fwriteint64_t(datalen
, ofile
);
1338 elf_foffs
+= ALIGN(datalen
, SEC_FILEALIGN
);
1339 fwriteint32_t((int32_t)link
, ofile
);
1340 fwriteint32_t((int32_t)info
, ofile
);
1341 fwriteint64_t((int64_t)align
, ofile
);
1342 fwriteint64_t((int64_t)eltsize
, ofile
);
1345 static void elf_write_sections(void)
1348 for (i
= 0; i
< elf_nsect
; i
++)
1349 if (elf_sects
[i
].data
) {
1350 int32_t len
= elf_sects
[i
].len
;
1351 int32_t reallen
= ALIGN(len
, SEC_FILEALIGN
);
1352 int32_t align
= reallen
- len
;
1353 if (elf_sects
[i
].is_saa
)
1354 saa_fpwrite(elf_sects
[i
].data
, ofile
);
1356 nasm_write(elf_sects
[i
].data
, len
, ofile
);
1357 fwritezero(align
, ofile
);
1361 static void elf_sect_write(struct elf_section
*sect
, const void *data
, size_t len
)
1363 saa_wbytes(sect
->data
, data
, len
);
1367 static void elf_sect_writeaddr(struct elf_section
*sect
, int64_t data
, size_t len
)
1369 saa_writeaddr(sect
->data
, data
, len
);
1373 static void elf_sectalign(int32_t seg
, unsigned int value
)
1375 struct elf_section
*s
= NULL
;
1378 for (i
= 0; i
< nsects
; i
++) {
1379 if (sects
[i
]->index
== seg
) {
1384 if (!s
|| !is_power2(value
))
1387 if (value
> s
->align
)
1391 static int32_t elf_segbase(int32_t segment
)
1396 static void elf_filename(char *inname
, char *outname
)
1398 strcpy(elf_module
, inname
);
1399 standard_extension(inname
, outname
, ".o");
1402 extern macros_t elf_stdmac
[];
1404 static int elf_set_info(enum geninfo type
, char **val
)
1410 static const struct dfmt df_dwarf
= {
1411 "ELF64 (x86-64) dwarf debug format for Linux/Unix",
1415 null_debug_deflabel
,
1416 null_debug_directive
,
1421 static const struct dfmt df_stabs
= {
1422 "ELF64 (x86-64) stabs debug format for Linux/Unix",
1426 null_debug_deflabel
,
1427 null_debug_directive
,
1433 static const struct dfmt
* const elf64_debugs_arr
[3] =
1434 { &df_dwarf
, &df_stabs
, NULL
};
1436 const struct ofmt of_elf64
= {
1437 "ELF64 (x86_64) object files (e.g. Linux)",
1456 /* common debugging routines */
1457 static void debug_typevalue(int32_t type
)
1459 int32_t stype
, ssize
;
1460 switch (TYM_TYPE(type
)) {
1503 stype
= STT_SECTION
;
1518 if (stype
== STT_OBJECT
&& lastsym
&& !lastsym
->type
) {
1519 lastsym
->size
= ssize
;
1520 lastsym
->type
= stype
;
1524 /* stabs debugging routines */
1526 static void stabs_linenum(const char *filename
, int32_t linenumber
, int32_t segto
)
1529 if (!stabs_filename
) {
1530 stabs_filename
= (char *)nasm_malloc(strlen(filename
) + 1);
1531 strcpy(stabs_filename
, filename
);
1533 if (strcmp(stabs_filename
, filename
)) {
1534 /* yep, a memory leak...this program is one-shot anyway, so who cares...
1535 in fact, this leak comes in quite handy to maintain a list of files
1536 encountered so far in the symbol lines... */
1538 /* why not nasm_free(stabs_filename); we're done with the old one */
1540 stabs_filename
= (char *)nasm_malloc(strlen(filename
) + 1);
1541 strcpy(stabs_filename
, filename
);
1545 currentline
= linenumber
;
1548 static void stabs_output(int type
, void *param
)
1550 struct symlininfo
*s
;
1551 struct linelist
*el
;
1552 if (type
== TY_DEBUGSYMLIN
) {
1553 if (debug_immcall
) {
1554 s
= (struct symlininfo
*)param
;
1555 if (!(sects
[s
->section
]->flags
& SHF_EXECINSTR
))
1556 return; /* line info is only collected for executable sections */
1558 el
= (struct linelist
*)nasm_malloc(sizeof(struct linelist
));
1559 el
->info
.offset
= s
->offset
;
1560 el
->info
.section
= s
->section
;
1561 el
->info
.name
= s
->name
;
1562 el
->line
= currentline
;
1563 el
->filename
= stabs_filename
;
1566 stabslines
->last
->next
= el
;
1567 stabslines
->last
= el
;
1570 stabslines
->last
= el
;
1577 /* for creating the .stab , .stabstr and .rel.stab sections in memory */
1579 static void stabs_generate(void)
1581 int i
, numfiles
, strsize
, numstabs
= 0, currfile
, mainfileindex
;
1582 uint8_t *sbuf
, *ssbuf
, *rbuf
, *sptr
, *rptr
;
1586 struct linelist
*ptr
;
1590 allfiles
= (char **)nasm_zalloc(numlinestabs
* sizeof(char *));
1593 if (numfiles
== 0) {
1594 allfiles
[0] = ptr
->filename
;
1597 for (i
= 0; i
< numfiles
; i
++) {
1598 if (!strcmp(allfiles
[i
], ptr
->filename
))
1601 if (i
>= numfiles
) {
1602 allfiles
[i
] = ptr
->filename
;
1609 fileidx
= (int *)nasm_malloc(numfiles
* sizeof(int));
1610 for (i
= 0; i
< numfiles
; i
++) {
1611 fileidx
[i
] = strsize
;
1612 strsize
+= strlen(allfiles
[i
]) + 1;
1615 for (i
= 0; i
< numfiles
; i
++) {
1616 if (!strcmp(allfiles
[i
], elf_module
)) {
1623 * worst case size of the stab buffer would be:
1624 * the sourcefiles changes each line, which would mean 1 SOL, 1 SYMLIN per line
1625 * plus one "ending" entry
1627 sbuf
= (uint8_t *)nasm_malloc((numlinestabs
* 2 + 4) *
1628 sizeof(struct stabentry
));
1629 ssbuf
= (uint8_t *)nasm_malloc(strsize
);
1630 rbuf
= (uint8_t *)nasm_malloc(numlinestabs
* 16 * (2 + 3));
1633 for (i
= 0; i
< numfiles
; i
++)
1634 strcpy((char *)ssbuf
+ fileidx
[i
], allfiles
[i
]);
1637 stabstrlen
= strsize
; /* set global variable for length of stab strings */
1645 * this is the first stab, its strx points to the filename of the
1646 * the source-file, the n_desc field should be set to the number
1647 * of remaining stabs
1649 WRITE_STAB(sptr
, fileidx
[0], 0, 0, 0, stabstrlen
);
1651 /* this is the stab for the main source file */
1652 WRITE_STAB(sptr
, fileidx
[mainfileindex
], N_SO
, 0, 0, 0);
1654 /* relocation table entry */
1657 * Since the symbol table has two entries before
1658 * the section symbols, the index in the info.section
1659 * member must be adjusted by adding 2
1662 WRITEDLONG(rptr
, (int64_t)(sptr
- sbuf
) - 4);
1663 WRITELONG(rptr
, R_X86_64_32
);
1664 WRITELONG(rptr
, ptr
->info
.section
+ 2);
1667 currfile
= mainfileindex
;
1671 if (strcmp(allfiles
[currfile
], ptr
->filename
)) {
1672 /* oops file has changed... */
1673 for (i
= 0; i
< numfiles
; i
++)
1674 if (!strcmp(allfiles
[i
], ptr
->filename
))
1677 WRITE_STAB(sptr
, fileidx
[currfile
], N_SOL
, 0, 0,
1681 /* relocation table entry */
1683 WRITEDLONG(rptr
, (int64_t)(sptr
- sbuf
) - 4);
1684 WRITELONG(rptr
, R_X86_64_32
);
1685 WRITELONG(rptr
, ptr
->info
.section
+ 2);
1688 WRITE_STAB(sptr
, 0, N_SLINE
, 0, ptr
->line
, ptr
->info
.offset
);
1691 /* relocation table entry */
1693 WRITEDLONG(rptr
, (int64_t)(sptr
- sbuf
) - 4);
1694 WRITELONG(rptr
, R_X86_64_32
);
1695 WRITELONG(rptr
, ptr
->info
.section
+ 2);
1701 /* this is an "ending" token */
1702 WRITE_STAB(sptr
, 0, N_SO
, 0, 0, 0);
1705 ((struct stabentry
*)sbuf
)->n_desc
= numstabs
;
1707 nasm_free(allfiles
);
1710 stablen
= (sptr
- sbuf
);
1711 stabrellen
= (rptr
- rbuf
);
1717 static void stabs_cleanup(void)
1719 struct linelist
*ptr
, *del
;
1731 nasm_free(stabrelbuf
);
1732 nasm_free(stabstrbuf
);
1735 /* dwarf routines */
1737 static void dwarf_init(void)
1739 ndebugs
= 3; /* 3 debug symbols */
1742 static void dwarf_linenum(const char *filename
, int32_t linenumber
,
1746 dwarf_findfile(filename
);
1748 currentline
= linenumber
;
1751 /* called from elf_out with type == TY_DEBUGSYMLIN */
1752 static void dwarf_output(int type
, void *param
)
1754 int ln
, aa
, inx
, maxln
, soc
;
1755 struct symlininfo
*s
;
1760 s
= (struct symlininfo
*)param
;
1762 /* line number info is only gathered for executable sections */
1763 if (!(sects
[s
->section
]->flags
& SHF_EXECINSTR
))
1766 /* Check if section index has changed */
1767 if (!(dwarf_csect
&& (dwarf_csect
->section
) == (s
->section
)))
1768 dwarf_findsect(s
->section
);
1770 /* do nothing unless line or file has changed */
1774 ln
= currentline
- dwarf_csect
->line
;
1775 aa
= s
->offset
- dwarf_csect
->offset
;
1776 inx
= dwarf_clist
->line
;
1777 plinep
= dwarf_csect
->psaa
;
1778 /* check for file change */
1779 if (!(inx
== dwarf_csect
->file
)) {
1780 saa_write8(plinep
,DW_LNS_set_file
);
1781 saa_write8(plinep
,inx
);
1782 dwarf_csect
->file
= inx
;
1784 /* check for line change */
1786 /* test if in range of special op code */
1787 maxln
= line_base
+ line_range
;
1788 soc
= (ln
- line_base
) + (line_range
* aa
) + opcode_base
;
1789 if (ln
>= line_base
&& ln
< maxln
&& soc
< 256) {
1790 saa_write8(plinep
,soc
);
1792 saa_write8(plinep
,DW_LNS_advance_line
);
1793 saa_wleb128s(plinep
,ln
);
1795 saa_write8(plinep
,DW_LNS_advance_pc
);
1796 saa_wleb128u(plinep
,aa
);
1799 dwarf_csect
->line
= currentline
;
1800 dwarf_csect
->offset
= s
->offset
;
1803 /* show change handled */
1808 static void dwarf_generate(void)
1812 struct linelist
*ftentry
;
1813 struct SAA
*paranges
, *ppubnames
, *pinfo
, *pabbrev
, *plines
, *plinep
;
1814 struct SAA
*parangesrel
, *plinesrel
, *pinforel
;
1815 struct sectlist
*psect
;
1816 size_t saalen
, linepoff
, totlen
, highaddr
;
1818 /* write epilogues for each line program range */
1819 /* and build aranges section */
1820 paranges
= saa_init(1L);
1821 parangesrel
= saa_init(1L);
1822 saa_write16(paranges
,3); /* dwarf version */
1823 saa_write64(parangesrel
, paranges
->datalen
+4);
1824 saa_write64(parangesrel
, (dwarf_infosym
<< 32) + R_X86_64_32
); /* reloc to info */
1825 saa_write64(parangesrel
, 0);
1826 saa_write32(paranges
,0); /* offset into info */
1827 saa_write8(paranges
,8); /* pointer size */
1828 saa_write8(paranges
,0); /* not segmented */
1829 saa_write32(paranges
,0); /* padding */
1830 /* iterate though sectlist entries */
1831 psect
= dwarf_fsect
;
1834 for (indx
= 0; indx
< dwarf_nsections
; indx
++) {
1835 plinep
= psect
->psaa
;
1836 /* Line Number Program Epilogue */
1837 saa_write8(plinep
,2); /* std op 2 */
1838 saa_write8(plinep
,(sects
[psect
->section
]->len
)-psect
->offset
);
1839 saa_write8(plinep
,DW_LNS_extended_op
);
1840 saa_write8(plinep
,1); /* operand length */
1841 saa_write8(plinep
,DW_LNE_end_sequence
);
1842 totlen
+= plinep
->datalen
;
1843 /* range table relocation entry */
1844 saa_write64(parangesrel
, paranges
->datalen
+ 4);
1845 saa_write64(parangesrel
, ((uint64_t) (psect
->section
+ 2) << 32) + R_X86_64_64
);
1846 saa_write64(parangesrel
, (uint64_t) 0);
1847 /* range table entry */
1848 saa_write64(paranges
,0x0000); /* range start */
1849 saa_write64(paranges
,sects
[psect
->section
]->len
); /* range length */
1850 highaddr
+= sects
[psect
->section
]->len
;
1851 /* done with this entry */
1852 psect
= psect
->next
;
1854 saa_write64(paranges
,0); /* null address */
1855 saa_write64(paranges
,0); /* null length */
1856 saalen
= paranges
->datalen
;
1857 arangeslen
= saalen
+ 4;
1858 arangesbuf
= pbuf
= nasm_malloc(arangeslen
);
1859 WRITELONG(pbuf
,saalen
); /* initial length */
1860 saa_rnbytes(paranges
, pbuf
, saalen
);
1863 /* build rela.aranges section */
1864 arangesrellen
= saalen
= parangesrel
->datalen
;
1865 arangesrelbuf
= pbuf
= nasm_malloc(arangesrellen
);
1866 saa_rnbytes(parangesrel
, pbuf
, saalen
);
1867 saa_free(parangesrel
);
1869 /* build pubnames section */
1870 ppubnames
= saa_init(1L);
1871 saa_write16(ppubnames
,3); /* dwarf version */
1872 saa_write32(ppubnames
,0); /* offset into info */
1873 saa_write32(ppubnames
,0); /* space used in info */
1874 saa_write32(ppubnames
,0); /* end of list */
1875 saalen
= ppubnames
->datalen
;
1876 pubnameslen
= saalen
+ 4;
1877 pubnamesbuf
= pbuf
= nasm_malloc(pubnameslen
);
1878 WRITELONG(pbuf
,saalen
); /* initial length */
1879 saa_rnbytes(ppubnames
, pbuf
, saalen
);
1880 saa_free(ppubnames
);
1882 /* build info section */
1883 pinfo
= saa_init(1L);
1884 pinforel
= saa_init(1L);
1885 saa_write16(pinfo
,3); /* dwarf version */
1886 saa_write64(pinforel
, pinfo
->datalen
+ 4);
1887 saa_write64(pinforel
, (dwarf_abbrevsym
<< 32) + R_X86_64_32
); /* reloc to abbrev */
1888 saa_write64(pinforel
, 0);
1889 saa_write32(pinfo
,0); /* offset into abbrev */
1890 saa_write8(pinfo
,8); /* pointer size */
1891 saa_write8(pinfo
,1); /* abbrviation number LEB128u */
1892 saa_write64(pinforel
, pinfo
->datalen
+ 4);
1893 saa_write64(pinforel
, ((uint64_t)(dwarf_fsect
->section
+ 2) << 32) + R_X86_64_64
);
1894 saa_write64(pinforel
, 0);
1895 saa_write64(pinfo
,0); /* DW_AT_low_pc */
1896 saa_write64(pinforel
, pinfo
->datalen
+ 4);
1897 saa_write64(pinforel
, ((uint64_t)(dwarf_fsect
->section
+ 2) << 32) + R_X86_64_64
);
1898 saa_write64(pinforel
, 0);
1899 saa_write64(pinfo
,highaddr
); /* DW_AT_high_pc */
1900 saa_write64(pinforel
, pinfo
->datalen
+ 4);
1901 saa_write64(pinforel
, (dwarf_linesym
<< 32) + R_X86_64_32
); /* reloc to line */
1902 saa_write64(pinforel
, 0);
1903 saa_write32(pinfo
,0); /* DW_AT_stmt_list */
1904 saa_wbytes(pinfo
, elf_module
, strlen(elf_module
)+1);
1905 saa_wbytes(pinfo
, nasm_signature
, strlen(nasm_signature
)+1);
1906 saa_write16(pinfo
,DW_LANG_Mips_Assembler
);
1907 saa_write8(pinfo
,2); /* abbrviation number LEB128u */
1908 saa_write64(pinforel
, pinfo
->datalen
+ 4);
1909 saa_write64(pinforel
, ((uint64_t)(dwarf_fsect
->section
+ 2) << 32) + R_X86_64_64
);
1910 saa_write64(pinforel
, 0);
1911 saa_write64(pinfo
,0); /* DW_AT_low_pc */
1912 saa_write64(pinfo
,0); /* DW_AT_frame_base */
1913 saa_write8(pinfo
,0); /* end of entries */
1914 saalen
= pinfo
->datalen
;
1915 infolen
= saalen
+ 4;
1916 infobuf
= pbuf
= nasm_malloc(infolen
);
1917 WRITELONG(pbuf
,saalen
); /* initial length */
1918 saa_rnbytes(pinfo
, pbuf
, saalen
);
1921 /* build rela.info section */
1922 inforellen
= saalen
= pinforel
->datalen
;
1923 inforelbuf
= pbuf
= nasm_malloc(inforellen
);
1924 saa_rnbytes(pinforel
, pbuf
, saalen
);
1927 /* build abbrev section */
1928 pabbrev
= saa_init(1L);
1929 saa_write8(pabbrev
,1); /* entry number LEB128u */
1930 saa_write8(pabbrev
,DW_TAG_compile_unit
); /* tag LEB128u */
1931 saa_write8(pabbrev
,1); /* has children */
1932 /* the following attributes and forms are all LEB128u values */
1933 saa_write8(pabbrev
,DW_AT_low_pc
);
1934 saa_write8(pabbrev
,DW_FORM_addr
);
1935 saa_write8(pabbrev
,DW_AT_high_pc
);
1936 saa_write8(pabbrev
,DW_FORM_addr
);
1937 saa_write8(pabbrev
,DW_AT_stmt_list
);
1938 saa_write8(pabbrev
,DW_FORM_data4
);
1939 saa_write8(pabbrev
,DW_AT_name
);
1940 saa_write8(pabbrev
,DW_FORM_string
);
1941 saa_write8(pabbrev
,DW_AT_producer
);
1942 saa_write8(pabbrev
,DW_FORM_string
);
1943 saa_write8(pabbrev
,DW_AT_language
);
1944 saa_write8(pabbrev
,DW_FORM_data2
);
1945 saa_write16(pabbrev
,0); /* end of entry */
1946 /* LEB128u usage same as above */
1947 saa_write8(pabbrev
,2); /* entry number */
1948 saa_write8(pabbrev
,DW_TAG_subprogram
);
1949 saa_write8(pabbrev
,0); /* no children */
1950 saa_write8(pabbrev
,DW_AT_low_pc
);
1951 saa_write8(pabbrev
,DW_FORM_addr
);
1952 saa_write8(pabbrev
,DW_AT_frame_base
);
1953 saa_write8(pabbrev
,DW_FORM_data4
);
1954 saa_write16(pabbrev
,0); /* end of entry */
1955 abbrevlen
= saalen
= pabbrev
->datalen
;
1956 abbrevbuf
= pbuf
= nasm_malloc(saalen
);
1957 saa_rnbytes(pabbrev
, pbuf
, saalen
);
1960 /* build line section */
1962 plines
= saa_init(1L);
1963 saa_write8(plines
,1); /* Minimum Instruction Length */
1964 saa_write8(plines
,1); /* Initial value of 'is_stmt' */
1965 saa_write8(plines
,line_base
); /* Line Base */
1966 saa_write8(plines
,line_range
); /* Line Range */
1967 saa_write8(plines
,opcode_base
); /* Opcode Base */
1968 /* standard opcode lengths (# of LEB128u operands) */
1969 saa_write8(plines
,0); /* Std opcode 1 length */
1970 saa_write8(plines
,1); /* Std opcode 2 length */
1971 saa_write8(plines
,1); /* Std opcode 3 length */
1972 saa_write8(plines
,1); /* Std opcode 4 length */
1973 saa_write8(plines
,1); /* Std opcode 5 length */
1974 saa_write8(plines
,0); /* Std opcode 6 length */
1975 saa_write8(plines
,0); /* Std opcode 7 length */
1976 saa_write8(plines
,0); /* Std opcode 8 length */
1977 saa_write8(plines
,1); /* Std opcode 9 length */
1978 saa_write8(plines
,0); /* Std opcode 10 length */
1979 saa_write8(plines
,0); /* Std opcode 11 length */
1980 saa_write8(plines
,1); /* Std opcode 12 length */
1981 /* Directory Table */
1982 saa_write8(plines
,0); /* End of table */
1983 /* File Name Table */
1984 ftentry
= dwarf_flist
;
1985 for (indx
= 0; indx
< dwarf_numfiles
; indx
++) {
1986 saa_wbytes(plines
, ftentry
->filename
, (int32_t)(strlen(ftentry
->filename
) + 1));
1987 saa_write8(plines
,0); /* directory LEB128u */
1988 saa_write8(plines
,0); /* time LEB128u */
1989 saa_write8(plines
,0); /* size LEB128u */
1990 ftentry
= ftentry
->next
;
1992 saa_write8(plines
,0); /* End of table */
1993 linepoff
= plines
->datalen
;
1994 linelen
= linepoff
+ totlen
+ 10;
1995 linebuf
= pbuf
= nasm_malloc(linelen
);
1996 WRITELONG(pbuf
,linelen
-4); /* initial length */
1997 WRITESHORT(pbuf
,3); /* dwarf version */
1998 WRITELONG(pbuf
,linepoff
); /* offset to line number program */
1999 /* write line header */
2001 saa_rnbytes(plines
, pbuf
, saalen
); /* read a given no. of bytes */
2004 /* concatonate line program ranges */
2006 plinesrel
= saa_init(1L);
2007 psect
= dwarf_fsect
;
2008 for (indx
= 0; indx
< dwarf_nsections
; indx
++) {
2009 saa_write64(plinesrel
, linepoff
);
2010 saa_write64(plinesrel
, ((uint64_t) (psect
->section
+ 2) << 32) + R_X86_64_64
);
2011 saa_write64(plinesrel
, (uint64_t) 0);
2012 plinep
= psect
->psaa
;
2013 saalen
= plinep
->datalen
;
2014 saa_rnbytes(plinep
, pbuf
, saalen
);
2018 /* done with this entry */
2019 psect
= psect
->next
;
2023 /* build rela.lines section */
2024 linerellen
=saalen
= plinesrel
->datalen
;
2025 linerelbuf
= pbuf
= nasm_malloc(linerellen
);
2026 saa_rnbytes(plinesrel
, pbuf
, saalen
);
2027 saa_free(plinesrel
);
2029 /* build frame section */
2031 framebuf
= pbuf
= nasm_malloc(framelen
);
2032 WRITELONG(pbuf
,framelen
-4); /* initial length */
2034 /* build loc section */
2036 locbuf
= pbuf
= nasm_malloc(loclen
);
2037 WRITEDLONG(pbuf
,0); /* null beginning offset */
2038 WRITEDLONG(pbuf
,0); /* null ending offset */
2041 static void dwarf_cleanup(void)
2043 nasm_free(arangesbuf
);
2044 nasm_free(arangesrelbuf
);
2045 nasm_free(pubnamesbuf
);
2047 nasm_free(inforelbuf
);
2048 nasm_free(abbrevbuf
);
2050 nasm_free(linerelbuf
);
2051 nasm_free(framebuf
);
2055 static void dwarf_findfile(const char * fname
)
2058 struct linelist
*match
;
2060 /* return if fname is current file name */
2061 if (dwarf_clist
&& !(strcmp(fname
, dwarf_clist
->filename
)))
2064 /* search for match */
2067 match
= dwarf_flist
;
2068 for (finx
= 0; finx
< dwarf_numfiles
; finx
++) {
2069 if (!(strcmp(fname
, match
->filename
))) {
2070 dwarf_clist
= match
;
2076 /* add file name to end of list */
2077 dwarf_clist
= (struct linelist
*)nasm_malloc(sizeof(struct linelist
));
2079 dwarf_clist
->line
= dwarf_numfiles
;
2080 dwarf_clist
->filename
= nasm_malloc(strlen(fname
) + 1);
2081 strcpy(dwarf_clist
->filename
,fname
);
2082 dwarf_clist
->next
= 0;
2083 if (!dwarf_flist
) { /* if first entry */
2084 dwarf_flist
= dwarf_elist
= dwarf_clist
;
2085 dwarf_clist
->last
= 0;
2086 } else { /* chain to previous entry */
2087 dwarf_elist
->next
= dwarf_clist
;
2088 dwarf_elist
= dwarf_clist
;
2092 static void dwarf_findsect(const int index
)
2095 struct sectlist
*match
;
2098 /* return if index is current section index */
2099 if (dwarf_csect
&& (dwarf_csect
->section
== index
))
2102 /* search for match */
2105 match
= dwarf_fsect
;
2106 for (sinx
= 0; sinx
< dwarf_nsections
; sinx
++) {
2107 if (match
->section
== index
) {
2108 dwarf_csect
= match
;
2111 match
= match
->next
;
2115 /* add entry to end of list */
2116 dwarf_csect
= (struct sectlist
*)nasm_malloc(sizeof(struct sectlist
));
2118 dwarf_csect
->psaa
= plinep
= saa_init(1L);
2119 dwarf_csect
->line
= 1;
2120 dwarf_csect
->offset
= 0;
2121 dwarf_csect
->file
= 1;
2122 dwarf_csect
->section
= index
;
2123 dwarf_csect
->next
= 0;
2124 /* set relocatable address at start of line program */
2125 saa_write8(plinep
,DW_LNS_extended_op
);
2126 saa_write8(plinep
,9); /* operand length */
2127 saa_write8(plinep
,DW_LNE_set_address
);
2128 saa_write64(plinep
,0); /* Start Address */
2130 if (!dwarf_fsect
) { /* if first entry */
2131 dwarf_fsect
= dwarf_esect
= dwarf_csect
;
2132 dwarf_csect
->last
= 0;
2133 } else { /* chain to previous entry */
2134 dwarf_esect
->next
= dwarf_csect
;
2135 dwarf_esect
= dwarf_csect
;