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 * outelf32.c output routines for the Netwide Assembler to produce
36 * ELF32 (i386 of course) object file format
54 #include "output/outform.h"
55 #include "output/outlib.h"
58 #include "output/dwarf.h"
59 #include "output/stabs.h"
60 #include "output/outelf.h"
65 static struct elf_section
**sects
;
66 static int nsects
, sectlen
;
68 #define SHSTR_DELTA 256
69 static char *shstrtab
;
70 static int shstrtablen
, shstrtabsize
;
72 static struct SAA
*syms
;
73 static uint32_t nlocals
, nglobs
, ndebugs
; /* Symbol counts */
75 static int32_t def_seg
;
77 static struct RAA
*bsym
;
79 static struct SAA
*strs
;
80 static uint32_t strslen
;
82 static struct elf_symbol
*fwds
;
84 static char elf_module
[FILENAME_MAX
];
86 extern struct ofmt of_elf32
;
88 static struct ELF_SECTDATA
{
93 static int elf_nsect
, nsections
;
94 static int32_t elf_foffs
;
96 static void elf_write(void);
97 static void elf_sect_write(struct elf_section
*, const uint8_t *,
99 static void elf_section_header(int, int, int, void *, bool, int32_t, int, int,
101 static void elf_write_sections(void);
102 static struct SAA
*elf_build_symtab(int32_t *, int32_t *);
103 static struct SAA
*elf_build_reltab(uint64_t *, struct elf_reloc
*);
104 static void add_sectname(char *, char *);
112 int section
; /* section index */
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 int32_t dwarf_infosym
, dwarf_abbrevsym
, dwarf_linesym
;
156 static struct dfmt df_dwarf
;
157 static struct dfmt df_stabs
;
158 static struct elf_symbol
*lastsym
;
160 /* common debugging routines */
161 static void debug32_typevalue(int32_t);
162 static void debug32_deflabel(char *, int32_t, int64_t, int, char *);
163 static void debug32_directive(const char *, const char *);
165 /* stabs debugging routines */
166 static void stabs32_linenum(const char *filename
, int32_t linenumber
, int32_t);
167 static void stabs32_output(int, void *);
168 static void stabs32_generate(void);
169 static void stabs32_cleanup(void);
171 /* dwarf debugging routines */
172 static void dwarf32_init(void);
173 static void dwarf32_linenum(const char *filename
, int32_t linenumber
, int32_t);
174 static void dwarf32_output(int, void *);
175 static void dwarf32_generate(void);
176 static void dwarf32_cleanup(void);
177 static void dwarf32_findfile(const char *);
178 static void dwarf32_findsect(const int);
181 * Special NASM section numbers which are used to define ELF special
182 * symbols, which can be used with WRT to provide PIC and TLS
185 static int32_t elf_gotpc_sect
, elf_gotoff_sect
;
186 static int32_t elf_got_sect
, elf_plt_sect
;
187 static int32_t elf_sym_sect
, elf_tlsie_sect
;
189 static void elf_init(void)
192 nsects
= sectlen
= 0;
193 syms
= saa_init((int32_t)sizeof(struct elf_symbol
));
194 nlocals
= nglobs
= ndebugs
= 0;
197 saa_wbytes(strs
, "\0", 1L);
198 saa_wbytes(strs
, elf_module
, strlen(elf_module
)+1);
199 strslen
= 2 + strlen(elf_module
);
201 shstrtablen
= shstrtabsize
= 0;;
202 add_sectname("", "");
206 elf_gotpc_sect
= seg_alloc();
207 define_label("..gotpc", elf_gotpc_sect
+ 1, 0L, NULL
, false, false);
208 elf_gotoff_sect
= seg_alloc();
209 define_label("..gotoff", elf_gotoff_sect
+ 1, 0L, NULL
, false, false);
210 elf_got_sect
= seg_alloc();
211 define_label("..got", elf_got_sect
+ 1, 0L, NULL
, false, false);
212 elf_plt_sect
= seg_alloc();
213 define_label("..plt", elf_plt_sect
+ 1, 0L, NULL
, false, false);
214 elf_sym_sect
= seg_alloc();
215 define_label("..sym", elf_sym_sect
+ 1, 0L, NULL
, false, false);
216 elf_tlsie_sect
= seg_alloc();
217 define_label("..tlsie", elf_tlsie_sect
+ 1, 0L, NULL
, false, false);
219 def_seg
= seg_alloc();
222 static void elf_cleanup(int debuginfo
)
230 for (i
= 0; i
< nsects
; i
++) {
231 if (sects
[i
]->type
!= SHT_NOBITS
)
232 saa_free(sects
[i
]->data
);
234 saa_free(sects
[i
]->rel
);
235 while (sects
[i
]->head
) {
237 sects
[i
]->head
= sects
[i
]->head
->next
;
245 if (of_elf32
.current_dfmt
) {
246 of_elf32
.current_dfmt
->cleanup();
250 static void add_sectname(char *firsthalf
, char *secondhalf
)
252 int len
= strlen(firsthalf
) + strlen(secondhalf
);
253 while (shstrtablen
+ len
+ 1 > shstrtabsize
)
254 shstrtab
= nasm_realloc(shstrtab
, (shstrtabsize
+= SHSTR_DELTA
));
255 strcpy(shstrtab
+ shstrtablen
, firsthalf
);
256 strcat(shstrtab
+ shstrtablen
, secondhalf
);
257 shstrtablen
+= len
+ 1;
260 static int elf_make_section(char *name
, int type
, int flags
, int align
)
262 struct elf_section
*s
;
264 s
= nasm_zalloc(sizeof(*s
));
266 if (type
!= SHT_NOBITS
)
267 s
->data
= saa_init(1L);
269 if (!strcmp(name
, ".text"))
272 s
->index
= seg_alloc();
273 add_sectname("", name
);
275 s
->name
= nasm_strdup(name
);
280 if (nsects
>= sectlen
)
281 sects
= nasm_realloc(sects
, (sectlen
+= SECT_DELTA
) * sizeof(*sects
));
287 static int32_t elf_section_names(char *name
, int pass
, int *bits
)
290 uint32_t flags
, flags_and
, flags_or
;
295 * Default is 32 bits.
302 p
= nasm_skip_word(name
);
305 flags_and
= flags_or
= type
= align
= 0;
307 elf_section_attrib(name
, p
, pass
, &flags_and
,
308 &flags_or
, &align
, &type
);
310 if (!strcmp(name
, ".shstrtab") ||
311 !strcmp(name
, ".symtab") ||
312 !strcmp(name
, ".strtab")) {
313 nasm_error(ERR_NONFATAL
, "attempt to redefine reserved section"
318 for (i
= 0; i
< nsects
; i
++)
319 if (!strcmp(name
, sects
[i
]->name
))
322 const struct elf_known_section
*ks
= elf_known_sections
;
325 if (!strcmp(name
, ks
->name
))
330 type
= type
? type
: ks
->type
;
331 align
= align
? align
: ks
->align
;
332 flags
= (ks
->flags
& ~flags_and
) | flags_or
;
334 i
= elf_make_section(name
, type
, flags
, align
);
335 } else if (pass
== 1) {
336 if ((type
&& sects
[i
]->type
!= type
)
337 || (align
&& sects
[i
]->align
!= align
)
338 || (flags_and
&& ((sects
[i
]->flags
& flags_and
) != flags_or
)))
339 nasm_error(ERR_WARNING
, "incompatible section attributes ignored on"
340 " redeclaration of section `%s'", name
);
343 return sects
[i
]->index
;
346 static void elf_deflabel(char *name
, int32_t segment
, int64_t offset
,
347 int is_global
, char *special
)
350 struct elf_symbol
*sym
;
351 bool special_used
= false;
353 #if defined(DEBUG) && DEBUG>2
354 nasm_error(ERR_DEBUG
,
355 " elf_deflabel: %s, seg=%"PRIx32
", off=%"PRIx64
", is_global=%d, %s\n",
356 name
, segment
, offset
, is_global
, special
);
358 if (name
[0] == '.' && name
[1] == '.' && name
[2] != '@') {
360 * This is a NASM special symbol. We never allow it into
361 * the ELF symbol table, even if it's a valid one. If it
362 * _isn't_ a valid one, we should barf immediately.
364 if (strcmp(name
, "..gotpc") && strcmp(name
, "..gotoff") &&
365 strcmp(name
, "..got") && strcmp(name
, "..plt") &&
366 strcmp(name
, "..sym") && strcmp(name
, "..tlsie"))
367 nasm_error(ERR_NONFATAL
, "unrecognised special symbol `%s'", name
);
371 if (is_global
== 3) {
372 struct elf_symbol
**s
;
374 * Fix up a forward-reference symbol size from the first
377 for (s
= &fwds
; *s
; s
= &(*s
)->nextfwd
)
378 if (!strcmp((*s
)->name
, name
)) {
379 struct tokenval tokval
;
381 char *p
= nasm_skip_spaces(nasm_skip_word(special
));
385 tokval
.t_type
= TOKEN_INVALID
;
386 e
= evaluate(stdscan
, NULL
, &tokval
, NULL
, 1, NULL
);
389 nasm_error(ERR_NONFATAL
, "cannot use relocatable"
390 " expression as symbol size");
392 (*s
)->size
= reloc_value(e
);
396 * Remove it from the list of unresolved sizes.
398 nasm_free((*s
)->name
);
402 return; /* it wasn't an important one */
405 saa_wbytes(strs
, name
, (int32_t)(1 + strlen(name
)));
406 strslen
+= 1 + strlen(name
);
408 lastsym
= sym
= saa_wstruct(syms
);
410 memset(&sym
->symv
, 0, sizeof(struct rbtree
));
413 sym
->type
= is_global
? SYM_GLOBAL
: SYM_LOCAL
;
414 sym
->other
= STV_DEFAULT
;
416 if (segment
== NO_SEG
)
417 sym
->section
= SHN_ABS
;
420 sym
->section
= SHN_UNDEF
;
421 if (segment
== def_seg
) {
422 /* we have to be sure at least text section is there */
424 if (segment
!= elf_section_names(".text", 2, &tempint
))
425 nasm_panic(0, "strange segment conditions in ELF driver");
427 for (i
= 0; i
< nsects
; i
++) {
428 if (segment
== sects
[i
]->index
) {
429 sym
->section
= i
+ 1;
435 if (is_global
== 2) {
438 sym
->section
= SHN_COMMON
;
440 * We have a common variable. Check the special text to see
441 * if it's a valid number and power of two; if so, store it
442 * as the alignment for the common variable.
446 sym
->symv
.key
= readnum(special
, &err
);
448 nasm_error(ERR_NONFATAL
, "alignment constraint `%s' is not a"
449 " valid number", special
);
450 else if ((sym
->symv
.key
| (sym
->symv
.key
- 1)) != 2 * sym
->symv
.key
- 1)
451 nasm_error(ERR_NONFATAL
, "alignment constraint `%s' is not a"
452 " power of two", special
);
456 sym
->symv
.key
= (sym
->section
== SHN_UNDEF
? 0 : offset
);
458 if (sym
->type
== SYM_GLOBAL
) {
460 * If sym->section == SHN_ABS, then the first line of the
461 * else section would cause a core dump, because its a reference
462 * beyond the end of the section array.
463 * This behaviour is exhibited by this code:
466 * To avoid such a crash, such requests are silently discarded.
467 * This may not be the best solution.
469 if (sym
->section
== SHN_UNDEF
|| sym
->section
== SHN_COMMON
) {
470 bsym
= raa_write(bsym
, segment
, nglobs
);
471 } else if (sym
->section
!= SHN_ABS
) {
473 * This is a global symbol; so we must add it to the rbtree
474 * of global symbols in its section.
476 * In addition, we check the special text for symbol
477 * type and size information.
479 sects
[sym
->section
-1]->gsyms
=
480 rb_insert(sects
[sym
->section
-1]->gsyms
, &sym
->symv
);
483 int n
= strcspn(special
, " \t");
485 if (!nasm_strnicmp(special
, "function", n
))
486 sym
->type
|= STT_FUNC
;
487 else if (!nasm_strnicmp(special
, "data", n
) ||
488 !nasm_strnicmp(special
, "object", n
))
489 sym
->type
|= STT_OBJECT
;
490 else if (!nasm_strnicmp(special
, "notype", n
))
491 sym
->type
|= STT_NOTYPE
;
493 nasm_error(ERR_NONFATAL
, "unrecognised symbol type `%.*s'",
497 special
= nasm_skip_spaces(special
);
499 n
= strcspn(special
, " \t");
500 if (!nasm_strnicmp(special
, "default", n
))
501 sym
->other
= STV_DEFAULT
;
502 else if (!nasm_strnicmp(special
, "internal", n
))
503 sym
->other
= STV_INTERNAL
;
504 else if (!nasm_strnicmp(special
, "hidden", n
))
505 sym
->other
= STV_HIDDEN
;
506 else if (!nasm_strnicmp(special
, "protected", n
))
507 sym
->other
= STV_PROTECTED
;
514 struct tokenval tokval
;
517 char *saveme
= stdscan_get();
519 while (special
[n
] && nasm_isspace(special
[n
]))
522 * We have a size expression; attempt to
526 stdscan_set(special
+ n
);
527 tokval
.t_type
= TOKEN_INVALID
;
528 e
= evaluate(stdscan
, NULL
, &tokval
, &fwd
, 0, NULL
);
532 sym
->name
= nasm_strdup(name
);
535 nasm_error(ERR_NONFATAL
, "cannot use relocatable"
536 " expression as symbol size");
538 sym
->size
= reloc_value(e
);
545 * If TLS segment, mark symbol accordingly.
547 if (sects
[sym
->section
- 1]->flags
& SHF_TLS
) {
549 sym
->type
|= STT_TLS
;
552 sym
->globnum
= nglobs
;
557 if (special
&& !special_used
)
558 nasm_error(ERR_NONFATAL
, "no special symbol features supported here");
561 static void elf_add_reloc(struct elf_section
*sect
, int32_t segment
, int type
)
565 r
= *sect
->tail
= nasm_zalloc(sizeof(struct elf_reloc
));
566 sect
->tail
= &r
->next
;
568 r
->address
= sect
->len
;
569 if (segment
!= NO_SEG
) {
571 for (i
= 0; i
< nsects
; i
++)
572 if (segment
== sects
[i
]->index
)
575 r
->symbol
= GLOBAL_TEMP_BASE
+ raa_read(bsym
, segment
);
583 * This routine deals with ..got and ..sym relocations: the more
584 * complicated kinds. In shared-library writing, some relocations
585 * with respect to global symbols must refer to the precise symbol
586 * rather than referring to an offset from the base of the section
587 * _containing_ the symbol. Such relocations call to this routine,
588 * which searches the symbol list for the symbol in question.
590 * R_386_GOT32 references require the _exact_ symbol address to be
591 * used; R_386_32 references can be at an offset from the symbol.
592 * The boolean argument `exact' tells us this.
594 * Return value is the adjusted value of `addr', having become an
595 * offset from the symbol rather than the section. Should always be
596 * zero when returning from an exact call.
598 * Limitation: if you define two symbols at the same place,
599 * confusion will occur.
601 * Inefficiency: we search, currently, using a linked list which
602 * isn't even necessarily sorted.
604 static int32_t elf_add_gsym_reloc(struct elf_section
*sect
,
605 int32_t segment
, uint32_t offset
,
606 int type
, bool exact
)
609 struct elf_section
*s
;
610 struct elf_symbol
*sym
;
615 * First look up the segment/offset pair and find a global
616 * symbol corresponding to it. If it's not one of our segments,
617 * then it must be an external symbol, in which case we're fine
618 * doing a normal elf_add_reloc after first sanity-checking
619 * that the offset from the symbol is zero.
622 for (i
= 0; i
< nsects
; i
++)
623 if (segment
== sects
[i
]->index
) {
630 nasm_error(ERR_NONFATAL
, "unable to find a suitable global symbol"
631 " for this reference");
633 elf_add_reloc(sect
, segment
, type
);
637 srb
= rb_search(s
->gsyms
, offset
);
638 if (!srb
|| (exact
&& srb
->key
!= offset
)) {
639 nasm_error(ERR_NONFATAL
, "unable to find a suitable global symbol"
640 " for this reference");
643 sym
= container_of(srb
, struct elf_symbol
, symv
);
645 r
= *sect
->tail
= nasm_malloc(sizeof(struct elf_reloc
));
646 sect
->tail
= &r
->next
;
649 r
->address
= sect
->len
;
650 r
->symbol
= GLOBAL_TEMP_BASE
+ sym
->globnum
;
655 return offset
- sym
->symv
.key
;
658 static void elf_out(int32_t segto
, const void *data
,
659 enum out_type type
, uint64_t size
,
660 int32_t segment
, int32_t wrt
)
662 struct elf_section
*s
;
664 uint8_t mydata
[8], *p
;
667 static struct symlininfo sinfo
;
670 * handle absolute-assembly (structure definitions)
672 if (segto
== NO_SEG
) {
673 if (type
!= OUT_RESERVE
)
674 nasm_error(ERR_NONFATAL
, "attempt to assemble code in [ABSOLUTE]"
680 for (i
= 0; i
< nsects
; i
++)
681 if (segto
== sects
[i
]->index
) {
686 int tempint
; /* ignored */
687 if (segto
!= elf_section_names(".text", 2, &tempint
))
688 nasm_panic(0, "strange segment conditions in ELF driver");
690 s
= sects
[nsects
- 1];
695 /* again some stabs debugging stuff */
696 if (of_elf32
.current_dfmt
) {
697 sinfo
.offset
= s
->len
;
699 sinfo
.name
= s
->name
;
700 of_elf32
.current_dfmt
->debug_output(TY_STABSSYMLIN
, &sinfo
);
702 /* end of debugging stuff */
704 if (s
->type
== SHT_NOBITS
&& type
!= OUT_RESERVE
) {
705 nasm_error(ERR_WARNING
, "attempt to initialize memory in"
706 " BSS section `%s': ignored", s
->name
);
707 s
->len
+= realsize(type
, size
);
711 memset(mydata
, 0, sizeof(mydata
));
715 if (s
->type
== SHT_PROGBITS
) {
716 nasm_error(ERR_WARNING
, "uninitialized space declared in"
717 " non-BSS section `%s': zeroing", s
->name
);
718 elf_sect_write(s
, NULL
, size
);
724 if (segment
!= NO_SEG
)
725 nasm_panic(0, "OUT_RAWDATA with other than NO_SEG");
726 elf_sect_write(s
, data
, size
);
732 int asize
= abs((int)size
);
733 addr
= *(int64_t *)data
;
734 if (segment
!= NO_SEG
) {
736 nasm_error(ERR_NONFATAL
, "ELF format does not support"
737 " segment base references");
741 * The if() is a hack to deal with compilers which
742 * don't handle switch() statements with 64-bit
748 elf_add_reloc(s
, segment
, R_386_8
);
752 elf_add_reloc(s
, segment
, R_386_16
);
755 elf_add_reloc(s
, segment
, R_386_32
);
757 default: /* Error issued further down */
760 } else if (wrt
== elf_gotpc_sect
+ 1) {
762 * The user will supply GOT relative to $$. ELF
763 * will let us have GOT relative to $. So we
764 * need to fix up the data item by $-$$.
767 elf_add_reloc(s
, segment
, R_386_GOTPC
);
768 } else if (wrt
== elf_gotoff_sect
+ 1) {
769 elf_add_reloc(s
, segment
, R_386_GOTOFF
);
770 } else if (wrt
== elf_tlsie_sect
+ 1) {
771 addr
= elf_add_gsym_reloc(s
, segment
, addr
,
773 } else if (wrt
== elf_got_sect
+ 1) {
774 addr
= elf_add_gsym_reloc(s
, segment
, addr
,
776 } else if (wrt
== elf_sym_sect
+ 1) {
780 addr
= elf_add_gsym_reloc(s
, segment
, addr
,
785 addr
= elf_add_gsym_reloc(s
, segment
, addr
,
789 addr
= elf_add_gsym_reloc(s
, segment
, addr
,
795 } else if (wrt
== elf_plt_sect
+ 1) {
796 nasm_error(ERR_NONFATAL
, "ELF format cannot produce non-PC-"
797 "relative PLT references");
799 nasm_error(ERR_NONFATAL
, "ELF format does not support this"
801 wrt
= NO_SEG
; /* we can at least _try_ to continue */
807 nasm_error(ERR_WARNING
| ERR_WARN_GNUELF
,
808 "8- or 16-bit relocations in ELF32 is a GNU extension");
809 } else if (asize
!= 4 && segment
!= NO_SEG
) {
810 nasm_error(ERR_NONFATAL
, "Unsupported non-32-bit ELF relocation");
812 WRITEADDR(p
, addr
, asize
);
813 elf_sect_write(s
, mydata
, asize
);
823 reltype
= R_386_PC16
;
827 nasm_assert(segment
!= segto
);
828 if (segment
!= NO_SEG
&& segment
% 2) {
829 nasm_error(ERR_NONFATAL
, "ELF format does not support"
830 " segment base references");
833 nasm_error(ERR_WARNING
| ERR_WARN_GNUELF
,
834 "8- or 16-bit relocations in ELF is a GNU extension");
835 elf_add_reloc(s
, segment
, reltype
);
837 nasm_error(ERR_NONFATAL
,
838 "Unsupported non-32-bit ELF relocation");
842 WRITESHORT(p
, *(int64_t *)data
- size
);
843 elf_sect_write(s
, mydata
, bytes
);
847 if (segment
== segto
)
848 nasm_panic(0, "intra-segment OUT_REL4ADR");
849 if (segment
!= NO_SEG
&& segment
% 2) {
850 nasm_error(ERR_NONFATAL
, "ELF format does not support"
851 " segment base references");
854 elf_add_reloc(s
, segment
, R_386_PC32
);
855 } else if (wrt
== elf_plt_sect
+ 1) {
856 elf_add_reloc(s
, segment
, R_386_PLT32
);
857 } else if (wrt
== elf_gotpc_sect
+ 1 ||
858 wrt
== elf_gotoff_sect
+ 1 ||
859 wrt
== elf_got_sect
+ 1) {
860 nasm_error(ERR_NONFATAL
, "ELF format cannot produce PC-"
861 "relative GOT references");
863 nasm_error(ERR_NONFATAL
, "ELF format does not support this"
865 wrt
= NO_SEG
; /* we can at least _try_ to continue */
869 WRITELONG(p
, *(int64_t *)data
- size
);
870 elf_sect_write(s
, mydata
, 4L);
874 nasm_error(ERR_NONFATAL
,
875 "32-bit ELF format does not support 64-bit relocations");
878 elf_sect_write(s
, mydata
, 8L);
883 static void elf_write(void)
890 int32_t symtablen
, symtablocal
;
893 * Work out how many sections we will have. We have SHN_UNDEF,
894 * then the flexible user sections, then the fixed sections
895 * `.shstrtab', `.symtab' and `.strtab', then optionally
896 * relocation sections for the user sections.
898 nsections
= sec_numspecial
+ 1;
899 if (of_elf32
.current_dfmt
== &df_stabs
)
901 else if (of_elf32
.current_dfmt
== &df_dwarf
)
904 add_sectname("", ".shstrtab");
905 add_sectname("", ".symtab");
906 add_sectname("", ".strtab");
907 for (i
= 0; i
< nsects
; i
++) {
908 nsections
++; /* for the section itself */
909 if (sects
[i
]->head
) {
910 nsections
++; /* for its relocations */
911 add_sectname(".rel", sects
[i
]->name
);
915 if (of_elf32
.current_dfmt
== &df_stabs
) {
916 /* in case the debug information is wanted, just add these three sections... */
917 add_sectname("", ".stab");
918 add_sectname("", ".stabstr");
919 add_sectname(".rel", ".stab");
920 } else if (of_elf32
.current_dfmt
== &df_dwarf
) {
921 /* the dwarf debug standard specifies the following ten sections,
922 not all of which are currently implemented,
923 although all of them are defined. */
924 add_sectname("", ".debug_aranges");
925 add_sectname(".rela", ".debug_aranges");
926 add_sectname("", ".debug_pubnames");
927 add_sectname("", ".debug_info");
928 add_sectname(".rela", ".debug_info");
929 add_sectname("", ".debug_abbrev");
930 add_sectname("", ".debug_line");
931 add_sectname(".rela", ".debug_line");
932 add_sectname("", ".debug_frame");
933 add_sectname("", ".debug_loc");
937 * Output the ELF header.
939 nasm_write("\177ELF\1\1\1", 7, ofile
);
940 fputc(elf_osabi
, ofile
);
941 fputc(elf_abiver
, ofile
);
942 fwritezero(7, ofile
);
943 fwriteint16_t(1, ofile
); /* ET_REL relocatable file */
944 fwriteint16_t(3, ofile
); /* EM_386 processor ID */
945 fwriteint32_t(1L, ofile
); /* EV_CURRENT file format version */
946 fwriteint32_t(0L, ofile
); /* no entry point */
947 fwriteint32_t(0L, ofile
); /* no program header table */
948 fwriteint32_t(0x40L
, ofile
); /* section headers straight after
949 * ELF header plus alignment */
950 fwriteint32_t(0L, ofile
); /* 386 defines no special flags */
951 fwriteint16_t(0x34, ofile
); /* size of ELF header */
952 fwriteint16_t(0, ofile
); /* no program header table, again */
953 fwriteint16_t(0, ofile
); /* still no program header table */
954 fwriteint16_t(0x28, ofile
); /* size of section header */
955 fwriteint16_t(nsections
, ofile
); /* number of sections */
956 fwriteint16_t(sec_shstrtab
, ofile
); /* string table section index for
957 * section header table */
958 fwriteint32_t(0L, ofile
); /* align to 0x40 bytes */
959 fwriteint32_t(0L, ofile
);
960 fwriteint32_t(0L, ofile
);
963 * Build the symbol table and relocation tables.
965 symtab
= elf_build_symtab(&symtablen
, &symtablocal
);
966 for (i
= 0; i
< nsects
; i
++)
968 sects
[i
]->rel
= elf_build_reltab(§s
[i
]->rellen
,
972 * Now output the section header table.
975 elf_foffs
= 0x40 + 0x28 * nsections
;
976 align
= ALIGN(elf_foffs
, SEC_FILEALIGN
) - elf_foffs
;
979 elf_sects
= nasm_malloc(sizeof(*elf_sects
) * nsections
);
982 elf_section_header(0, SHT_NULL
, 0, NULL
, false, 0, SHN_UNDEF
, 0, 0, 0);
985 /* The normal sections */
986 for (i
= 0; i
< nsects
; i
++) {
987 elf_section_header(p
- shstrtab
, sects
[i
]->type
, sects
[i
]->flags
,
988 (sects
[i
]->type
== SHT_PROGBITS
?
989 sects
[i
]->data
: NULL
), true,
990 sects
[i
]->len
, 0, 0, sects
[i
]->align
, 0);
995 elf_section_header(p
- shstrtab
, SHT_STRTAB
, 0, shstrtab
, false,
996 shstrtablen
, 0, 0, 1, 0);
1000 elf_section_header(p
- shstrtab
, SHT_SYMTAB
, 0, symtab
, true,
1001 symtablen
, sec_strtab
, symtablocal
, 4, 16);
1005 elf_section_header(p
- shstrtab
, SHT_STRTAB
, 0, strs
, true,
1006 strslen
, 0, 0, 1, 0);
1009 /* The relocation sections */
1010 for (i
= 0; i
< nsects
; i
++)
1011 if (sects
[i
]->head
) {
1012 elf_section_header(p
- shstrtab
, SHT_REL
, 0, sects
[i
]->rel
, true,
1013 sects
[i
]->rellen
, sec_symtab
, i
+ 1, 4, 8);
1017 if (of_elf32
.current_dfmt
== &df_stabs
) {
1018 /* for debugging information, create the last three sections
1019 which are the .stab , .stabstr and .rel.stab sections respectively */
1021 /* this function call creates the stab sections in memory */
1024 if (stabbuf
&& stabstrbuf
&& stabrelbuf
) {
1025 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, stabbuf
, false,
1026 stablen
, sec_stabstr
, 0, 4, 12);
1029 elf_section_header(p
- shstrtab
, SHT_STRTAB
, 0, stabstrbuf
, false,
1030 stabstrlen
, 0, 0, 4, 0);
1033 /* link -> symtable info -> section to refer to */
1034 elf_section_header(p
- shstrtab
, SHT_REL
, 0, stabrelbuf
, false,
1035 stabrellen
, sec_symtab
, sec_stab
, 4, 8);
1038 } else if (of_elf32
.current_dfmt
== &df_dwarf
) {
1039 /* for dwarf debugging information, create the ten dwarf sections */
1041 /* this function call creates the dwarf sections in memory */
1045 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, arangesbuf
, false,
1046 arangeslen
, 0, 0, 1, 0);
1049 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, arangesrelbuf
, false,
1050 arangesrellen
, sec_symtab
, sec_debug_aranges
,
1054 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, pubnamesbuf
,
1055 false, pubnameslen
, 0, 0, 1, 0);
1058 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, infobuf
, false,
1059 infolen
, 0, 0, 1, 0);
1062 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, inforelbuf
, false,
1063 inforellen
, sec_symtab
, sec_debug_info
, 1, 12);
1066 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, abbrevbuf
, false,
1067 abbrevlen
, 0, 0, 1, 0);
1070 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, linebuf
, false,
1071 linelen
, 0, 0, 1, 0);
1074 elf_section_header(p
- shstrtab
, SHT_RELA
, 0, linerelbuf
, false,
1075 linerellen
, sec_symtab
, sec_debug_line
, 1, 12);
1078 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, framebuf
, false,
1079 framelen
, 0, 0, 8, 0);
1082 elf_section_header(p
- shstrtab
, SHT_PROGBITS
, 0, locbuf
, false,
1083 loclen
, 0, 0, 1, 0);
1086 fwritezero(align
, ofile
);
1089 * Now output the sections.
1091 elf_write_sections();
1093 nasm_free(elf_sects
);
1097 static struct SAA
*elf_build_symtab(int32_t *len
, int32_t *local
)
1099 struct SAA
*s
= saa_init(1L);
1100 struct elf_symbol
*sym
;
1101 uint8_t entry
[16], *p
;
1107 * First, an all-zeros entry, required by the ELF spec.
1109 saa_wbytes(s
, NULL
, 16L); /* null symbol table entry */
1114 * Next, an entry for the file name.
1117 WRITELONG(p
, 1); /* we know it's 1st entry in strtab */
1118 WRITELONG(p
, 0); /* no value */
1119 WRITELONG(p
, 0); /* no size either */
1120 WRITESHORT(p
, STT_FILE
); /* type FILE */
1121 WRITESHORT(p
, SHN_ABS
);
1122 saa_wbytes(s
, entry
, 16L);
1127 * Now some standard symbols defining the segments, for relocation
1130 for (i
= 1; i
<= nsects
; i
++) {
1132 WRITELONG(p
, 0); /* no symbol name */
1133 WRITELONG(p
, 0); /* offset zero */
1134 WRITELONG(p
, 0); /* size zero */
1135 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1136 WRITESHORT(p
, i
); /* section id */
1137 saa_wbytes(s
, entry
, 16L);
1143 * Now the other local symbols.
1146 while ((sym
= saa_rstruct(syms
))) {
1147 if (sym
->type
& SYM_GLOBAL
)
1150 WRITELONG(p
, sym
->strpos
);
1151 WRITELONG(p
, sym
->symv
.key
);
1152 WRITELONG(p
, sym
->size
);
1153 WRITECHAR(p
, sym
->type
); /* type and binding */
1154 WRITECHAR(p
, sym
->other
); /* visibility */
1155 WRITESHORT(p
, sym
->section
);
1156 saa_wbytes(s
, entry
, 16L);
1161 * dwarf needs symbols for debug sections
1162 * which are relocation targets.
1164 /*** fix for 32 bit ***/
1165 if (of_elf32
.current_dfmt
== &df_dwarf
) {
1166 dwarf_infosym
= *local
;
1168 WRITELONG(p
, 0); /* no symbol name */
1169 WRITELONG(p
, (uint32_t) 0); /* offset zero */
1170 WRITELONG(p
, (uint32_t) 0); /* size zero */
1171 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1172 WRITESHORT(p
, sec_debug_info
); /* section id */
1173 saa_wbytes(s
, entry
, 16L);
1176 dwarf_abbrevsym
= *local
;
1178 WRITELONG(p
, 0); /* no symbol name */
1179 WRITELONG(p
, (uint32_t) 0); /* offset zero */
1180 WRITELONG(p
, (uint32_t) 0); /* size zero */
1181 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1182 WRITESHORT(p
, sec_debug_abbrev
); /* section id */
1183 saa_wbytes(s
, entry
, 16L);
1186 dwarf_linesym
= *local
;
1188 WRITELONG(p
, 0); /* no symbol name */
1189 WRITELONG(p
, (uint32_t) 0); /* offset zero */
1190 WRITELONG(p
, (uint32_t) 0); /* size zero */
1191 WRITESHORT(p
, STT_SECTION
); /* type, binding, and visibility */
1192 WRITESHORT(p
, sec_debug_line
); /* section id */
1193 saa_wbytes(s
, entry
, 16L);
1199 * Now the global symbols.
1202 while ((sym
= saa_rstruct(syms
))) {
1203 if (!(sym
->type
& SYM_GLOBAL
))
1206 WRITELONG(p
, sym
->strpos
);
1207 WRITELONG(p
, sym
->symv
.key
);
1208 WRITELONG(p
, sym
->size
);
1209 WRITECHAR(p
, sym
->type
); /* type and binding */
1210 WRITECHAR(p
, sym
->other
); /* visibility */
1211 WRITESHORT(p
, sym
->section
);
1212 saa_wbytes(s
, entry
, 16L);
1219 static struct SAA
*elf_build_reltab(uint64_t *len
, struct elf_reloc
*r
)
1222 uint8_t *p
, entry
[8];
1223 int32_t global_offset
;
1232 * How to onvert from a global placeholder to a real symbol index;
1233 * the +2 refers to the two special entries, the null entry and
1234 * the filename entry.
1236 global_offset
= -GLOBAL_TEMP_BASE
+ nsects
+ nlocals
+ ndebugs
+ 2;
1239 int32_t sym
= r
->symbol
;
1241 if (sym
>= GLOBAL_TEMP_BASE
)
1242 sym
+= global_offset
;
1245 WRITELONG(p
, r
->address
);
1246 WRITELONG(p
, (sym
<< 8) + r
->type
);
1247 saa_wbytes(s
, entry
, 8L);
1256 static void elf_section_header(int name
, int type
, int flags
,
1257 void *data
, bool is_saa
, int32_t datalen
,
1258 int link
, int info
, int align
, int eltsize
)
1260 elf_sects
[elf_nsect
].data
= data
;
1261 elf_sects
[elf_nsect
].len
= datalen
;
1262 elf_sects
[elf_nsect
].is_saa
= is_saa
;
1265 fwriteint32_t((int32_t)name
, ofile
);
1266 fwriteint32_t((int32_t)type
, ofile
);
1267 fwriteint32_t((int32_t)flags
, ofile
);
1268 fwriteint32_t(0L, ofile
); /* no address, ever, in object files */
1269 fwriteint32_t(type
== 0 ? 0L : elf_foffs
, ofile
);
1270 fwriteint32_t(datalen
, ofile
);
1272 elf_foffs
+= ALIGN(datalen
, SEC_FILEALIGN
);
1273 fwriteint32_t((int32_t)link
, ofile
);
1274 fwriteint32_t((int32_t)info
, ofile
);
1275 fwriteint32_t((int32_t)align
, ofile
);
1276 fwriteint32_t((int32_t)eltsize
, ofile
);
1279 static void elf_write_sections(void)
1282 for (i
= 0; i
< elf_nsect
; i
++)
1283 if (elf_sects
[i
].data
) {
1284 int32_t len
= elf_sects
[i
].len
;
1285 int32_t reallen
= ALIGN(len
, SEC_FILEALIGN
);
1286 int32_t align
= reallen
- len
;
1287 if (elf_sects
[i
].is_saa
)
1288 saa_fpwrite(elf_sects
[i
].data
, ofile
);
1290 nasm_write(elf_sects
[i
].data
, len
, ofile
);
1291 fwritezero(align
, ofile
);
1295 static void elf_sect_write(struct elf_section
*sect
,
1296 const uint8_t *data
, uint32_t len
)
1298 saa_wbytes(sect
->data
, data
, len
);
1302 static void elf_sectalign(int32_t seg
, unsigned int value
)
1304 struct elf_section
*s
= NULL
;
1307 for (i
= 0; i
< nsects
; i
++) {
1308 if (sects
[i
]->index
== seg
) {
1313 if (!s
|| !is_power2(value
))
1316 if (value
> s
->align
)
1320 static int32_t elf_segbase(int32_t segment
)
1325 static void elf_filename(char *inname
, char *outname
)
1327 strcpy(elf_module
, inname
);
1328 standard_extension(inname
, outname
, ".o");
1331 extern macros_t elf_stdmac
[];
1333 static int elf_set_info(enum geninfo type
, char **val
)
1339 static struct dfmt df_dwarf
= {
1340 "ELF32 (i386) dwarf debug format for Linux/Unix",
1350 static struct dfmt df_stabs
= {
1351 "ELF32 (i386) stabs debug format for Linux/Unix",
1362 struct dfmt
*elf32_debugs_arr
[3] = { &df_dwarf
, &df_stabs
, NULL
};
1364 struct ofmt of_elf32
= {
1365 "ELF32 (i386) object files (e.g. Linux)",
1384 /* again, the stabs debugging stuff (code) */
1386 static void stabs32_linenum(const char *filename
, int32_t linenumber
,
1391 if (!stabs_filename
) {
1392 stabs_filename
= (char *)nasm_malloc(strlen(filename
) + 1);
1393 strcpy(stabs_filename
, filename
);
1395 if (strcmp(stabs_filename
, filename
)) {
1397 * yep, a memory leak...this program is one-shot anyway, so who cares...
1398 * in fact, this leak comes in quite handy to maintain a list of files
1399 * encountered so far in the symbol lines...
1402 /* why not nasm_free(stabs_filename); we're done with the old one */
1404 stabs_filename
= (char *)nasm_malloc(strlen(filename
) + 1);
1405 strcpy(stabs_filename
, filename
);
1409 currentline
= linenumber
;
1412 static void debug32_deflabel(char *name
, int32_t segment
, int64_t offset
, int is_global
,
1422 static void debug32_directive(const char *directive
, const char *params
)
1428 static void debug32_typevalue(int32_t type
)
1430 int32_t stype
, ssize
;
1431 switch (TYM_TYPE(type
)) {
1474 stype
= STT_SECTION
;
1489 if (stype
== STT_OBJECT
&& lastsym
&& !lastsym
->type
) {
1490 lastsym
->size
= ssize
;
1491 lastsym
->type
= stype
;
1495 static void stabs32_output(int type
, void *param
)
1497 struct symlininfo
*s
;
1498 struct linelist
*el
;
1499 if (type
== TY_STABSSYMLIN
) {
1500 if (debug_immcall
) {
1501 s
= (struct symlininfo
*)param
;
1502 if (!(sects
[s
->section
]->flags
& SHF_EXECINSTR
))
1503 return; /* line info is only collected for executable sections */
1505 el
= (struct linelist
*)nasm_malloc(sizeof(struct linelist
));
1506 el
->info
.offset
= s
->offset
;
1507 el
->info
.section
= s
->section
;
1508 el
->info
.name
= s
->name
;
1509 el
->line
= currentline
;
1510 el
->filename
= stabs_filename
;
1513 stabslines
->last
->next
= el
;
1514 stabslines
->last
= el
;
1517 stabslines
->last
= el
;
1524 /* for creating the .stab , .stabstr and .rel.stab sections in memory */
1526 static void stabs32_generate(void)
1528 int i
, numfiles
, strsize
, numstabs
= 0, currfile
, mainfileindex
;
1529 uint8_t *sbuf
, *ssbuf
, *rbuf
, *sptr
, *rptr
;
1533 struct linelist
*ptr
;
1537 allfiles
= (char **)nasm_malloc(numlinestabs
* sizeof(char *));
1538 for (i
= 0; i
< numlinestabs
; i
++)
1542 if (numfiles
== 0) {
1543 allfiles
[0] = ptr
->filename
;
1546 for (i
= 0; i
< numfiles
; i
++) {
1547 if (!strcmp(allfiles
[i
], ptr
->filename
))
1550 if (i
>= numfiles
) {
1551 allfiles
[i
] = ptr
->filename
;
1558 fileidx
= (int *)nasm_malloc(numfiles
* sizeof(int));
1559 for (i
= 0; i
< numfiles
; i
++) {
1560 fileidx
[i
] = strsize
;
1561 strsize
+= strlen(allfiles
[i
]) + 1;
1564 for (i
= 0; i
< numfiles
; i
++) {
1565 if (!strcmp(allfiles
[i
], elf_module
)) {
1572 * worst case size of the stab buffer would be:
1573 * the sourcefiles changes each line, which would mean 1 SOL, 1 SYMLIN per line
1574 * plus one "ending" entry
1576 sbuf
= (uint8_t *)nasm_malloc((numlinestabs
* 2 + 4) *
1577 sizeof(struct stabentry
));
1578 ssbuf
= (uint8_t *)nasm_malloc(strsize
);
1579 rbuf
= (uint8_t *)nasm_malloc(numlinestabs
* 8 * (2 + 3));
1582 for (i
= 0; i
< numfiles
; i
++)
1583 strcpy((char *)ssbuf
+ fileidx
[i
], allfiles
[i
]);
1586 stabstrlen
= strsize
; /* set global variable for length of stab strings */
1594 * this is the first stab, its strx points to the filename of the
1595 * the source-file, the n_desc field should be set to the number
1596 * of remaining stabs
1598 WRITE_STAB(sptr
, fileidx
[0], 0, 0, 0, stabstrlen
);
1600 /* this is the stab for the main source file */
1601 WRITE_STAB(sptr
, fileidx
[mainfileindex
], N_SO
, 0, 0, 0);
1603 /* relocation table entry */
1606 * Since the symbol table has two entries before
1607 * the section symbols, the index in the info.section
1608 * member must be adjusted by adding 2
1611 WRITELONG(rptr
, (sptr
- sbuf
) - 4);
1612 WRITELONG(rptr
, ((ptr
->info
.section
+ 2) << 8) | R_386_32
);
1615 currfile
= mainfileindex
;
1619 if (strcmp(allfiles
[currfile
], ptr
->filename
)) {
1620 /* oops file has changed... */
1621 for (i
= 0; i
< numfiles
; i
++)
1622 if (!strcmp(allfiles
[i
], ptr
->filename
))
1625 WRITE_STAB(sptr
, fileidx
[currfile
], N_SOL
, 0, 0,
1629 /* relocation table entry */
1630 WRITELONG(rptr
, (sptr
- sbuf
) - 4);
1631 WRITELONG(rptr
, ((ptr
->info
.section
+ 2) << 8) | R_386_32
);
1634 WRITE_STAB(sptr
, 0, N_SLINE
, 0, ptr
->line
, ptr
->info
.offset
);
1637 /* relocation table entry */
1639 WRITELONG(rptr
, (sptr
- sbuf
) - 4);
1640 WRITELONG(rptr
, ((ptr
->info
.section
+ 2) << 8) | R_386_32
);
1646 /* this is an "ending" token */
1647 WRITE_STAB(sptr
, 0, N_SO
, 0, 0, 0);
1650 ((struct stabentry
*)sbuf
)->n_desc
= numstabs
;
1652 nasm_free(allfiles
);
1655 stablen
= (sptr
- sbuf
);
1656 stabrellen
= (rptr
- rbuf
);
1662 static void stabs32_cleanup(void)
1664 struct linelist
*ptr
, *del
;
1676 nasm_free(stabrelbuf
);
1677 nasm_free(stabstrbuf
);
1680 /* dwarf routines */
1682 static void dwarf32_init(void)
1684 ndebugs
= 3; /* 3 debug symbols */
1687 static void dwarf32_linenum(const char *filename
, int32_t linenumber
,
1691 dwarf32_findfile(filename
);
1693 currentline
= linenumber
;
1696 /* called from elf_out with type == TY_DEBUGSYMLIN */
1697 static void dwarf32_output(int type
, void *param
)
1699 int ln
, aa
, inx
, maxln
, soc
;
1700 struct symlininfo
*s
;
1705 s
= (struct symlininfo
*)param
;
1707 /* line number info is only gathered for executable sections */
1708 if (!(sects
[s
->section
]->flags
& SHF_EXECINSTR
))
1711 /* Check if section index has changed */
1712 if (!(dwarf_csect
&& (dwarf_csect
->section
) == (s
->section
)))
1713 dwarf32_findsect(s
->section
);
1715 /* do nothing unless line or file has changed */
1719 ln
= currentline
- dwarf_csect
->line
;
1720 aa
= s
->offset
- dwarf_csect
->offset
;
1721 inx
= dwarf_clist
->line
;
1722 plinep
= dwarf_csect
->psaa
;
1723 /* check for file change */
1724 if (!(inx
== dwarf_csect
->file
)) {
1725 saa_write8(plinep
,DW_LNS_set_file
);
1726 saa_write8(plinep
,inx
);
1727 dwarf_csect
->file
= inx
;
1729 /* check for line change */
1731 /* test if in range of special op code */
1732 maxln
= line_base
+ line_range
;
1733 soc
= (ln
- line_base
) + (line_range
* aa
) + opcode_base
;
1734 if (ln
>= line_base
&& ln
< maxln
&& soc
< 256) {
1735 saa_write8(plinep
,soc
);
1737 saa_write8(plinep
,DW_LNS_advance_line
);
1738 saa_wleb128s(plinep
,ln
);
1740 saa_write8(plinep
,DW_LNS_advance_pc
);
1741 saa_wleb128u(plinep
,aa
);
1744 dwarf_csect
->line
= currentline
;
1745 dwarf_csect
->offset
= s
->offset
;
1748 /* show change handled */
1753 static void dwarf32_generate(void)
1757 struct linelist
*ftentry
;
1758 struct SAA
*paranges
, *ppubnames
, *pinfo
, *pabbrev
, *plines
, *plinep
;
1759 struct SAA
*parangesrel
, *plinesrel
, *pinforel
;
1760 struct sectlist
*psect
;
1761 size_t saalen
, linepoff
, totlen
, highaddr
;
1763 /* write epilogues for each line program range */
1764 /* and build aranges section */
1765 paranges
= saa_init(1L);
1766 parangesrel
= saa_init(1L);
1767 saa_write16(paranges
,2); /* dwarf version */
1768 saa_write32(parangesrel
, paranges
->datalen
+4);
1769 saa_write32(parangesrel
, (dwarf_infosym
<< 8) + R_386_32
); /* reloc to info */
1770 saa_write32(parangesrel
, 0);
1771 saa_write32(paranges
,0); /* offset into info */
1772 saa_write8(paranges
,4); /* pointer size */
1773 saa_write8(paranges
,0); /* not segmented */
1774 saa_write32(paranges
,0); /* padding */
1775 /* iterate though sectlist entries */
1776 psect
= dwarf_fsect
;
1779 for (indx
= 0; indx
< dwarf_nsections
; indx
++) {
1780 plinep
= psect
->psaa
;
1781 /* Line Number Program Epilogue */
1782 saa_write8(plinep
,2); /* std op 2 */
1783 saa_write8(plinep
,(sects
[psect
->section
]->len
)-psect
->offset
);
1784 saa_write8(plinep
,DW_LNS_extended_op
);
1785 saa_write8(plinep
,1); /* operand length */
1786 saa_write8(plinep
,DW_LNE_end_sequence
);
1787 totlen
+= plinep
->datalen
;
1788 /* range table relocation entry */
1789 saa_write32(parangesrel
, paranges
->datalen
+ 4);
1790 saa_write32(parangesrel
, ((uint32_t) (psect
->section
+ 2) << 8) + R_386_32
);
1791 saa_write32(parangesrel
, (uint32_t) 0);
1792 /* range table entry */
1793 saa_write32(paranges
,0x0000); /* range start */
1794 saa_write32(paranges
,sects
[psect
->section
]->len
); /* range length */
1795 highaddr
+= sects
[psect
->section
]->len
;
1796 /* done with this entry */
1797 psect
= psect
->next
;
1799 saa_write32(paranges
,0); /* null address */
1800 saa_write32(paranges
,0); /* null length */
1801 saalen
= paranges
->datalen
;
1802 arangeslen
= saalen
+ 4;
1803 arangesbuf
= pbuf
= nasm_malloc(arangeslen
);
1804 WRITELONG(pbuf
,saalen
); /* initial length */
1805 saa_rnbytes(paranges
, pbuf
, saalen
);
1808 /* build rela.aranges section */
1809 arangesrellen
= saalen
= parangesrel
->datalen
;
1810 arangesrelbuf
= pbuf
= nasm_malloc(arangesrellen
);
1811 saa_rnbytes(parangesrel
, pbuf
, saalen
);
1812 saa_free(parangesrel
);
1814 /* build pubnames section */
1815 ppubnames
= saa_init(1L);
1816 saa_write16(ppubnames
,3); /* dwarf version */
1817 saa_write32(ppubnames
,0); /* offset into info */
1818 saa_write32(ppubnames
,0); /* space used in info */
1819 saa_write32(ppubnames
,0); /* end of list */
1820 saalen
= ppubnames
->datalen
;
1821 pubnameslen
= saalen
+ 4;
1822 pubnamesbuf
= pbuf
= nasm_malloc(pubnameslen
);
1823 WRITELONG(pbuf
,saalen
); /* initial length */
1824 saa_rnbytes(ppubnames
, pbuf
, saalen
);
1825 saa_free(ppubnames
);
1827 /* build info section */
1828 pinfo
= saa_init(1L);
1829 pinforel
= saa_init(1L);
1830 saa_write16(pinfo
,2); /* dwarf version */
1831 saa_write32(pinforel
, pinfo
->datalen
+ 4);
1832 saa_write32(pinforel
, (dwarf_abbrevsym
<< 8) + R_386_32
); /* reloc to abbrev */
1833 saa_write32(pinforel
, 0);
1834 saa_write32(pinfo
,0); /* offset into abbrev */
1835 saa_write8(pinfo
,4); /* pointer size */
1836 saa_write8(pinfo
,1); /* abbrviation number LEB128u */
1837 saa_write32(pinforel
, pinfo
->datalen
+ 4);
1838 saa_write32(pinforel
, ((dwarf_fsect
->section
+ 2) << 8) + R_386_32
);
1839 saa_write32(pinforel
, 0);
1840 saa_write32(pinfo
,0); /* DW_AT_low_pc */
1841 saa_write32(pinforel
, pinfo
->datalen
+ 4);
1842 saa_write32(pinforel
, ((dwarf_fsect
->section
+ 2) << 8) + R_386_32
);
1843 saa_write32(pinforel
, 0);
1844 saa_write32(pinfo
,highaddr
); /* DW_AT_high_pc */
1845 saa_write32(pinforel
, pinfo
->datalen
+ 4);
1846 saa_write32(pinforel
, (dwarf_linesym
<< 8) + R_386_32
); /* reloc to line */
1847 saa_write32(pinforel
, 0);
1848 saa_write32(pinfo
,0); /* DW_AT_stmt_list */
1849 saa_wbytes(pinfo
, elf_module
, strlen(elf_module
)+1);
1850 saa_wbytes(pinfo
, nasm_signature
, strlen(nasm_signature
)+1);
1851 saa_write16(pinfo
,DW_LANG_Mips_Assembler
);
1852 saa_write8(pinfo
,2); /* abbrviation number LEB128u */
1853 saa_write32(pinforel
, pinfo
->datalen
+ 4);
1854 saa_write32(pinforel
, ((dwarf_fsect
->section
+ 2) << 8) + R_386_32
);
1855 saa_write32(pinforel
, 0);
1856 saa_write32(pinfo
,0); /* DW_AT_low_pc */
1857 saa_write32(pinfo
,0); /* DW_AT_frame_base */
1858 saa_write8(pinfo
,0); /* end of entries */
1859 saalen
= pinfo
->datalen
;
1860 infolen
= saalen
+ 4;
1861 infobuf
= pbuf
= nasm_malloc(infolen
);
1862 WRITELONG(pbuf
,saalen
); /* initial length */
1863 saa_rnbytes(pinfo
, pbuf
, saalen
);
1866 /* build rela.info section */
1867 inforellen
= saalen
= pinforel
->datalen
;
1868 inforelbuf
= pbuf
= nasm_malloc(inforellen
);
1869 saa_rnbytes(pinforel
, pbuf
, saalen
);
1872 /* build abbrev section */
1873 pabbrev
= saa_init(1L);
1874 saa_write8(pabbrev
,1); /* entry number LEB128u */
1875 saa_write8(pabbrev
,DW_TAG_compile_unit
); /* tag LEB128u */
1876 saa_write8(pabbrev
,1); /* has children */
1877 /* the following attributes and forms are all LEB128u values */
1878 saa_write8(pabbrev
,DW_AT_low_pc
);
1879 saa_write8(pabbrev
,DW_FORM_addr
);
1880 saa_write8(pabbrev
,DW_AT_high_pc
);
1881 saa_write8(pabbrev
,DW_FORM_addr
);
1882 saa_write8(pabbrev
,DW_AT_stmt_list
);
1883 saa_write8(pabbrev
,DW_FORM_data4
);
1884 saa_write8(pabbrev
,DW_AT_name
);
1885 saa_write8(pabbrev
,DW_FORM_string
);
1886 saa_write8(pabbrev
,DW_AT_producer
);
1887 saa_write8(pabbrev
,DW_FORM_string
);
1888 saa_write8(pabbrev
,DW_AT_language
);
1889 saa_write8(pabbrev
,DW_FORM_data2
);
1890 saa_write16(pabbrev
,0); /* end of entry */
1891 /* LEB128u usage same as above */
1892 saa_write8(pabbrev
,2); /* entry number */
1893 saa_write8(pabbrev
,DW_TAG_subprogram
);
1894 saa_write8(pabbrev
,0); /* no children */
1895 saa_write8(pabbrev
,DW_AT_low_pc
);
1896 saa_write8(pabbrev
,DW_FORM_addr
);
1897 saa_write8(pabbrev
,DW_AT_frame_base
);
1898 saa_write8(pabbrev
,DW_FORM_data4
);
1899 saa_write16(pabbrev
,0); /* end of entry */
1900 abbrevlen
= saalen
= pabbrev
->datalen
;
1901 abbrevbuf
= pbuf
= nasm_malloc(saalen
);
1902 saa_rnbytes(pabbrev
, pbuf
, saalen
);
1905 /* build line section */
1907 plines
= saa_init(1L);
1908 saa_write8(plines
,1); /* Minimum Instruction Length */
1909 saa_write8(plines
,1); /* Initial value of 'is_stmt' */
1910 saa_write8(plines
,line_base
); /* Line Base */
1911 saa_write8(plines
,line_range
); /* Line Range */
1912 saa_write8(plines
,opcode_base
); /* Opcode Base */
1913 /* standard opcode lengths (# of LEB128u operands) */
1914 saa_write8(plines
,0); /* Std opcode 1 length */
1915 saa_write8(plines
,1); /* Std opcode 2 length */
1916 saa_write8(plines
,1); /* Std opcode 3 length */
1917 saa_write8(plines
,1); /* Std opcode 4 length */
1918 saa_write8(plines
,1); /* Std opcode 5 length */
1919 saa_write8(plines
,0); /* Std opcode 6 length */
1920 saa_write8(plines
,0); /* Std opcode 7 length */
1921 saa_write8(plines
,0); /* Std opcode 8 length */
1922 saa_write8(plines
,1); /* Std opcode 9 length */
1923 saa_write8(plines
,0); /* Std opcode 10 length */
1924 saa_write8(plines
,0); /* Std opcode 11 length */
1925 saa_write8(plines
,1); /* Std opcode 12 length */
1926 /* Directory Table */
1927 saa_write8(plines
,0); /* End of table */
1928 /* File Name Table */
1929 ftentry
= dwarf_flist
;
1930 for (indx
= 0; indx
< dwarf_numfiles
; indx
++) {
1931 saa_wbytes(plines
, ftentry
->filename
, (int32_t)(strlen(ftentry
->filename
) + 1));
1932 saa_write8(plines
,0); /* directory LEB128u */
1933 saa_write8(plines
,0); /* time LEB128u */
1934 saa_write8(plines
,0); /* size LEB128u */
1935 ftentry
= ftentry
->next
;
1937 saa_write8(plines
,0); /* End of table */
1938 linepoff
= plines
->datalen
;
1939 linelen
= linepoff
+ totlen
+ 10;
1940 linebuf
= pbuf
= nasm_malloc(linelen
);
1941 WRITELONG(pbuf
,linelen
-4); /* initial length */
1942 WRITESHORT(pbuf
,3); /* dwarf version */
1943 WRITELONG(pbuf
,linepoff
); /* offset to line number program */
1944 /* write line header */
1946 saa_rnbytes(plines
, pbuf
, saalen
); /* read a given no. of bytes */
1949 /* concatonate line program ranges */
1951 plinesrel
= saa_init(1L);
1952 psect
= dwarf_fsect
;
1953 for (indx
= 0; indx
< dwarf_nsections
; indx
++) {
1954 saa_write32(plinesrel
, linepoff
);
1955 saa_write32(plinesrel
, ((uint32_t) (psect
->section
+ 2) << 8) + R_386_32
);
1956 saa_write32(plinesrel
, (uint32_t) 0);
1957 plinep
= psect
->psaa
;
1958 saalen
= plinep
->datalen
;
1959 saa_rnbytes(plinep
, pbuf
, saalen
);
1963 /* done with this entry */
1964 psect
= psect
->next
;
1968 /* build rela.lines section */
1969 linerellen
=saalen
= plinesrel
->datalen
;
1970 linerelbuf
= pbuf
= nasm_malloc(linerellen
);
1971 saa_rnbytes(plinesrel
, pbuf
, saalen
);
1972 saa_free(plinesrel
);
1974 /* build frame section */
1976 framebuf
= pbuf
= nasm_malloc(framelen
);
1977 WRITELONG(pbuf
,framelen
-4); /* initial length */
1979 /* build loc section */
1981 locbuf
= pbuf
= nasm_malloc(loclen
);
1982 WRITELONG(pbuf
,0); /* null beginning offset */
1983 WRITELONG(pbuf
,0); /* null ending offset */
1986 static void dwarf32_cleanup(void)
1988 nasm_free(arangesbuf
);
1989 nasm_free(arangesrelbuf
);
1990 nasm_free(pubnamesbuf
);
1992 nasm_free(inforelbuf
);
1993 nasm_free(abbrevbuf
);
1995 nasm_free(linerelbuf
);
1996 nasm_free(framebuf
);
2000 static void dwarf32_findfile(const char * fname
)
2003 struct linelist
*match
;
2005 /* return if fname is current file name */
2006 if (dwarf_clist
&& !(strcmp(fname
, dwarf_clist
->filename
)))
2009 /* search for match */
2012 match
= dwarf_flist
;
2013 for (finx
= 0; finx
< dwarf_numfiles
; finx
++) {
2014 if (!(strcmp(fname
, match
->filename
))) {
2015 dwarf_clist
= match
;
2021 /* add file name to end of list */
2022 dwarf_clist
= (struct linelist
*)nasm_malloc(sizeof(struct linelist
));
2024 dwarf_clist
->line
= dwarf_numfiles
;
2025 dwarf_clist
->filename
= nasm_malloc(strlen(fname
) + 1);
2026 strcpy(dwarf_clist
->filename
,fname
);
2027 dwarf_clist
->next
= 0;
2028 if (!dwarf_flist
) { /* if first entry */
2029 dwarf_flist
= dwarf_elist
= dwarf_clist
;
2030 dwarf_clist
->last
= 0;
2031 } else { /* chain to previous entry */
2032 dwarf_elist
->next
= dwarf_clist
;
2033 dwarf_elist
= dwarf_clist
;
2037 static void dwarf32_findsect(const int index
)
2040 struct sectlist
*match
;
2043 /* return if index is current section index */
2044 if (dwarf_csect
&& (dwarf_csect
->section
== index
))
2047 /* search for match */
2050 match
= dwarf_fsect
;
2051 for (sinx
= 0; sinx
< dwarf_nsections
; sinx
++) {
2052 if (match
->section
== index
) {
2053 dwarf_csect
= match
;
2056 match
= match
->next
;
2060 /* add entry to end of list */
2061 dwarf_csect
= (struct sectlist
*)nasm_malloc(sizeof(struct sectlist
));
2063 dwarf_csect
->psaa
= plinep
= saa_init(1L);
2064 dwarf_csect
->line
= 1;
2065 dwarf_csect
->offset
= 0;
2066 dwarf_csect
->file
= 1;
2067 dwarf_csect
->section
= index
;
2068 dwarf_csect
->next
= 0;
2069 /* set relocatable address at start of line program */
2070 saa_write8(plinep
,DW_LNS_extended_op
);
2071 saa_write8(plinep
,5); /* operand length */
2072 saa_write8(plinep
,DW_LNE_set_address
);
2073 saa_write32(plinep
,0); /* Start Address */
2075 if (!dwarf_fsect
) { /* if first entry */
2076 dwarf_fsect
= dwarf_esect
= dwarf_csect
;
2077 dwarf_csect
->last
= 0;
2078 } else { /* chain to previous entry */
2079 dwarf_esect
->next
= dwarf_csect
;
2080 dwarf_esect
= dwarf_csect
;