2 * ELF file handling for TCC
4 * Copyright (c) 2001-2004 Fabrice Bellard
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2 of the License, or (at your option) any later version.
11 * This library is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with this library; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 /* Define this to get some debug output during relocation processing. */
26 /********************************************************/
27 /* global variables */
29 ST_DATA Section
*text_section
, *data_section
, *bss_section
; /* predefined sections */
30 ST_DATA Section
*common_section
;
31 ST_DATA Section
*cur_text_section
; /* current section where function code is generated */
33 ST_DATA Section
*last_text_section
; /* to handle .previous asm directive */
35 #ifdef CONFIG_TCC_BCHECK
36 /* bound check related sections */
37 ST_DATA Section
*bounds_section
; /* contains global data bound description */
38 ST_DATA Section
*lbounds_section
; /* contains local data bound description */
41 ST_DATA Section
*symtab_section
;
43 ST_DATA Section
*stab_section
, *stabstr_section
;
45 /* XXX: avoid static variable */
46 static int new_undef_sym
= 0; /* Is there a new undefined sym since last new_undef_sym() */
48 /* special flag to indicate that the section should not be linked to the other ones */
49 #define SHF_PRIVATE 0x80000000
50 /* section is dynsymtab_section */
51 #define SHF_DYNSYM 0x40000000
53 /* ------------------------------------------------------------------------- */
55 ST_FUNC
void tccelf_new(TCCState
*s
)
58 dynarray_add(&s
->sections
, &s
->nb_sections
, NULL
);
60 /* create standard sections */
61 text_section
= new_section(s
, ".text", SHT_PROGBITS
, SHF_ALLOC
| SHF_EXECINSTR
);
62 data_section
= new_section(s
, ".data", SHT_PROGBITS
, SHF_ALLOC
| SHF_WRITE
);
63 bss_section
= new_section(s
, ".bss", SHT_NOBITS
, SHF_ALLOC
| SHF_WRITE
);
64 common_section
= new_section(s
, ".common", SHT_NOBITS
, SHF_PRIVATE
);
65 common_section
->sh_num
= SHN_COMMON
;
67 /* symbols are always generated for linking stage */
68 symtab_section
= new_symtab(s
, ".symtab", SHT_SYMTAB
, 0,
70 ".hashtab", SHF_PRIVATE
);
71 s
->symtab
= symtab_section
;
73 /* private symbol table for dynamic symbols */
74 s
->dynsymtab_section
= new_symtab(s
, ".dynsymtab", SHT_SYMTAB
, SHF_PRIVATE
|SHF_DYNSYM
,
76 ".dynhashtab", SHF_PRIVATE
);
77 get_sym_attr(s
, 0, 1);
80 #ifdef CONFIG_TCC_BCHECK
81 ST_FUNC
void tccelf_bounds_new(TCCState
*s
)
83 /* create bounds sections */
84 bounds_section
= new_section(s
, ".bounds",
85 SHT_PROGBITS
, SHF_ALLOC
);
86 lbounds_section
= new_section(s
, ".lbounds",
87 SHT_PROGBITS
, SHF_ALLOC
);
91 ST_FUNC
void tccelf_stab_new(TCCState
*s
)
93 stab_section
= new_section(s
, ".stab", SHT_PROGBITS
, 0);
94 stab_section
->sh_entsize
= sizeof(Stab_Sym
);
95 stabstr_section
= new_section(s
, ".stabstr", SHT_STRTAB
, 0);
96 put_elf_str(stabstr_section
, "");
97 stab_section
->link
= stabstr_section
;
99 put_stabs("", 0, 0, 0, 0);
102 static void free_section(Section
*s
)
107 ST_FUNC
void tccelf_delete(TCCState
*s1
)
111 /* free all sections */
112 for(i
= 1; i
< s1
->nb_sections
; i
++)
113 free_section(s1
->sections
[i
]);
114 dynarray_reset(&s1
->sections
, &s1
->nb_sections
);
116 for(i
= 0; i
< s1
->nb_priv_sections
; i
++)
117 free_section(s1
->priv_sections
[i
]);
118 dynarray_reset(&s1
->priv_sections
, &s1
->nb_priv_sections
);
120 /* free any loaded DLLs */
122 for ( i
= 0; i
< s1
->nb_loaded_dlls
; i
++) {
123 DLLReference
*ref
= s1
->loaded_dlls
[i
];
126 FreeLibrary((HMODULE
)ref
->handle
);
128 dlclose(ref
->handle
);
132 /* free loaded dlls array */
133 dynarray_reset(&s1
->loaded_dlls
, &s1
->nb_loaded_dlls
);
134 tcc_free(s1
->sym_attrs
);
136 symtab_section
= NULL
; /* for tccrun.c:rt_printline() */
139 /* save section data state */
140 ST_FUNC
void tccelf_begin_file(TCCState
*s1
)
143 for (i
= 1; i
< s1
->nb_sections
; i
++) {
145 s
->sh_offset
= s
->data_offset
;
147 /* disable symbol hashing during compilation */
148 s
= s1
->symtab
, s
->reloc
= s
->hash
, s
->hash
= NULL
;
149 #if defined TCC_TARGET_X86_64 && defined TCC_TARGET_PE
154 /* At the end of compilation, convert any UNDEF syms to global, and merge
155 with previously existing symbols */
156 ST_FUNC
void tccelf_end_file(TCCState
*s1
)
158 Section
*s
= s1
->symtab
;
159 int first_sym
, nb_syms
, *tr
, i
;
161 first_sym
= s
->sh_offset
/ sizeof (ElfSym
);
162 nb_syms
= s
->data_offset
/ sizeof (ElfSym
) - first_sym
;
163 s
->data_offset
= s
->sh_offset
;
164 s
->link
->data_offset
= s
->link
->sh_offset
;
165 s
->hash
= s
->reloc
, s
->reloc
= NULL
;
166 tr
= tcc_mallocz(nb_syms
* sizeof *tr
);
168 for (i
= 0; i
< nb_syms
; ++i
) {
169 ElfSym
*sym
= (ElfSym
*)s
->data
+ first_sym
+ i
;
170 if (sym
->st_shndx
== SHN_UNDEF
171 && ELFW(ST_BIND
)(sym
->st_info
) == STB_LOCAL
)
172 sym
->st_info
= ELFW(ST_INFO
)(STB_GLOBAL
, ELFW(ST_TYPE
)(sym
->st_info
));
173 tr
[i
] = set_elf_sym(s
, sym
->st_value
, sym
->st_size
, sym
->st_info
,
174 sym
->st_other
, sym
->st_shndx
, s
->link
->data
+ sym
->st_name
);
176 /* now update relocations */
177 for (i
= 1; i
< s1
->nb_sections
; i
++) {
178 Section
*sr
= s1
->sections
[i
];
179 if (sr
->sh_type
== SHT_RELX
&& sr
->link
== s
) {
180 ElfW_Rel
*rel
= (ElfW_Rel
*)(sr
->data
+ sr
->sh_offset
);
181 ElfW_Rel
*rel_end
= (ElfW_Rel
*)(sr
->data
+ sr
->data_offset
);
182 for (; rel
< rel_end
; ++rel
) {
183 int n
= ELFW(R_SYM
)(rel
->r_info
) - first_sym
;
184 //if (n < 0) tcc_error("internal: invalid symbol index in relocation");
185 rel
->r_info
= ELFW(R_INFO
)(tr
[n
], ELFW(R_TYPE
)(rel
->r_info
));
192 ST_FUNC Section
*new_section(TCCState
*s1
, const char *name
, int sh_type
, int sh_flags
)
196 sec
= tcc_mallocz(sizeof(Section
) + strlen(name
));
197 strcpy(sec
->name
, name
);
198 sec
->sh_type
= sh_type
;
199 sec
->sh_flags
= sh_flags
;
207 sec
->sh_addralign
= 4;
210 sec
->sh_addralign
= 1;
213 sec
->sh_addralign
= PTR_SIZE
; /* gcc/pcc default alignment */
217 if (sh_flags
& SHF_PRIVATE
) {
218 dynarray_add(&s1
->priv_sections
, &s1
->nb_priv_sections
, sec
);
220 sec
->sh_num
= s1
->nb_sections
;
221 dynarray_add(&s1
->sections
, &s1
->nb_sections
, sec
);
227 ST_FUNC Section
*new_symtab(TCCState
*s1
,
228 const char *symtab_name
, int sh_type
, int sh_flags
,
229 const char *strtab_name
,
230 const char *hash_name
, int hash_sh_flags
)
232 Section
*symtab
, *strtab
, *hash
;
233 int *ptr
, nb_buckets
;
235 symtab
= new_section(s1
, symtab_name
, sh_type
, sh_flags
);
236 symtab
->sh_entsize
= sizeof(ElfW(Sym
));
237 strtab
= new_section(s1
, strtab_name
, SHT_STRTAB
, sh_flags
);
238 put_elf_str(strtab
, "");
239 symtab
->link
= strtab
;
240 put_elf_sym(symtab
, 0, 0, 0, 0, 0, NULL
);
244 hash
= new_section(s1
, hash_name
, SHT_HASH
, hash_sh_flags
);
245 hash
->sh_entsize
= sizeof(int);
249 ptr
= section_ptr_add(hash
, (2 + nb_buckets
+ 1) * sizeof(int));
252 memset(ptr
+ 2, 0, (nb_buckets
+ 1) * sizeof(int));
256 /* realloc section and set its content to zero */
257 ST_FUNC
void section_realloc(Section
*sec
, unsigned long new_size
)
262 size
= sec
->data_allocated
;
265 while (size
< new_size
)
267 data
= tcc_realloc(sec
->data
, size
);
268 memset(data
+ sec
->data_allocated
, 0, size
- sec
->data_allocated
);
270 sec
->data_allocated
= size
;
273 /* reserve at least 'size' bytes aligned per 'align' in section
274 'sec' from current offset, and return the aligned offset */
275 ST_FUNC
size_t section_add(Section
*sec
, addr_t size
, int align
)
277 size_t offset
, offset1
;
279 offset
= (sec
->data_offset
+ align
- 1) & -align
;
280 offset1
= offset
+ size
;
281 if (sec
->sh_type
!= SHT_NOBITS
&& offset1
> sec
->data_allocated
)
282 section_realloc(sec
, offset1
);
283 sec
->data_offset
= offset1
;
284 if (align
> sec
->sh_addralign
)
285 sec
->sh_addralign
= align
;
289 /* reserve at least 'size' bytes in section 'sec' from
291 ST_FUNC
void *section_ptr_add(Section
*sec
, addr_t size
)
293 size_t offset
= section_add(sec
, size
, 1);
294 return sec
->data
+ offset
;
297 /* reserve at least 'size' bytes from section start */
298 ST_FUNC
void section_reserve(Section
*sec
, unsigned long size
)
300 if (size
> sec
->data_allocated
)
301 section_realloc(sec
, size
);
302 if (size
> sec
->data_offset
)
303 sec
->data_offset
= size
;
306 /* return a reference to a section, and create it if it does not
308 ST_FUNC Section
*find_section(TCCState
*s1
, const char *name
)
312 for(i
= 1; i
< s1
->nb_sections
; i
++) {
313 sec
= s1
->sections
[i
];
314 if (!strcmp(name
, sec
->name
))
317 /* sections are created as PROGBITS */
318 return new_section(s1
, name
, SHT_PROGBITS
, SHF_ALLOC
);
321 /* ------------------------------------------------------------------------- */
323 ST_FUNC
int put_elf_str(Section
*s
, const char *sym
)
328 len
= strlen(sym
) + 1;
329 offset
= s
->data_offset
;
330 ptr
= section_ptr_add(s
, len
);
331 memmove(ptr
, sym
, len
);
335 /* elf symbol hashing function */
336 static unsigned long elf_hash(const unsigned char *name
)
338 unsigned long h
= 0, g
;
341 h
= (h
<< 4) + *name
++;
350 /* rebuild hash table of section s */
351 /* NOTE: we do factorize the hash table code to go faster */
352 static void rebuild_hash(Section
*s
, unsigned int nb_buckets
)
355 int *ptr
, *hash
, nb_syms
, sym_index
, h
;
356 unsigned char *strtab
;
358 strtab
= s
->link
->data
;
359 nb_syms
= s
->data_offset
/ sizeof(ElfW(Sym
));
362 nb_buckets
= ((int*)s
->hash
->data
)[0];
364 s
->hash
->data_offset
= 0;
365 ptr
= section_ptr_add(s
->hash
, (2 + nb_buckets
+ nb_syms
) * sizeof(int));
370 memset(hash
, 0, (nb_buckets
+ 1) * sizeof(int));
371 ptr
+= nb_buckets
+ 1;
373 sym
= (ElfW(Sym
) *)s
->data
+ 1;
374 for(sym_index
= 1; sym_index
< nb_syms
; sym_index
++) {
375 if (ELFW(ST_BIND
)(sym
->st_info
) != STB_LOCAL
) {
376 h
= elf_hash(strtab
+ sym
->st_name
) % nb_buckets
;
387 /* return the symbol number */
388 ST_FUNC
int put_elf_sym(Section
*s
, addr_t value
, unsigned long size
,
389 int info
, int other
, int shndx
, const char *name
)
391 int name_offset
, sym_index
;
396 sym
= section_ptr_add(s
, sizeof(ElfW(Sym
)));
398 name_offset
= put_elf_str(s
->link
, name
);
401 /* XXX: endianness */
402 sym
->st_name
= name_offset
;
403 sym
->st_value
= value
;
406 sym
->st_other
= other
;
407 sym
->st_shndx
= shndx
;
408 sym_index
= sym
- (ElfW(Sym
) *)s
->data
;
412 ptr
= section_ptr_add(hs
, sizeof(int));
413 base
= (int *)hs
->data
;
414 /* only add global or weak symbols. */
415 if (ELFW(ST_BIND
)(info
) != STB_LOCAL
) {
416 /* add another hashing entry */
418 h
= elf_hash((unsigned char *)s
->link
->data
+ name_offset
) % nbuckets
;
420 base
[2 + h
] = sym_index
;
422 /* we resize the hash table */
423 hs
->nb_hashed_syms
++;
424 if (hs
->nb_hashed_syms
> 2 * nbuckets
) {
425 rebuild_hash(s
, 2 * nbuckets
);
435 ST_FUNC
int find_elf_sym(Section
*s
, const char *name
)
439 int nbuckets
, sym_index
, h
;
445 nbuckets
= ((int *)hs
->data
)[0];
446 h
= elf_hash((unsigned char *) name
) % nbuckets
;
447 sym_index
= ((int *)hs
->data
)[2 + h
];
448 while (sym_index
!= 0) {
449 sym
= &((ElfW(Sym
) *)s
->data
)[sym_index
];
450 name1
= (char *) s
->link
->data
+ sym
->st_name
;
451 if (!strcmp(name
, name1
))
453 sym_index
= ((int *)hs
->data
)[2 + nbuckets
+ sym_index
];
458 /* return elf symbol value, signal error if 'err' is nonzero */
459 ST_FUNC addr_t
get_elf_sym_addr(TCCState
*s
, const char *name
, int err
)
464 sym_index
= find_elf_sym(s
->symtab
, name
);
465 sym
= &((ElfW(Sym
) *)s
->symtab
->data
)[sym_index
];
466 if (!sym_index
|| sym
->st_shndx
== SHN_UNDEF
) {
468 tcc_error("%s not defined", name
);
471 return sym
->st_value
;
474 /* return elf symbol value */
475 LIBTCCAPI
void *tcc_get_symbol(TCCState
*s
, const char *name
)
477 return (void*)(uintptr_t)get_elf_sym_addr(s
, name
, 0);
480 #if defined TCC_IS_NATIVE || defined TCC_TARGET_PE
481 /* return elf symbol value or error */
482 ST_FUNC
void* tcc_get_symbol_err(TCCState
*s
, const char *name
)
484 return (void*)(uintptr_t)get_elf_sym_addr(s
, name
, 1);
488 /* add an elf symbol : check if it is already defined and patch
489 it. Return symbol index. NOTE that sh_num can be SHN_UNDEF. */
490 ST_FUNC
int set_elf_sym(Section
*s
, addr_t value
, unsigned long size
,
491 int info
, int other
, int shndx
, const char *name
)
494 int sym_bind
, sym_index
, sym_type
, esym_bind
;
495 unsigned char sym_vis
, esym_vis
, new_vis
;
497 sym_bind
= ELFW(ST_BIND
)(info
);
498 sym_type
= ELFW(ST_TYPE
)(info
);
499 sym_vis
= ELFW(ST_VISIBILITY
)(other
);
501 if (sym_bind
!= STB_LOCAL
) {
502 /* we search global or weak symbols */
503 sym_index
= find_elf_sym(s
, name
);
506 esym
= &((ElfW(Sym
) *)s
->data
)[sym_index
];
507 if (esym
->st_value
== value
&& esym
->st_size
== size
&& esym
->st_info
== info
508 && esym
->st_other
== other
&& esym
->st_shndx
== shndx
)
510 if (esym
->st_shndx
!= SHN_UNDEF
) {
511 esym_bind
= ELFW(ST_BIND
)(esym
->st_info
);
512 /* propagate the most constraining visibility */
513 /* STV_DEFAULT(0)<STV_PROTECTED(3)<STV_HIDDEN(2)<STV_INTERNAL(1) */
514 esym_vis
= ELFW(ST_VISIBILITY
)(esym
->st_other
);
515 if (esym_vis
== STV_DEFAULT
) {
517 } else if (sym_vis
== STV_DEFAULT
) {
520 new_vis
= (esym_vis
< sym_vis
) ? esym_vis
: sym_vis
;
522 esym
->st_other
= (esym
->st_other
& ~ELFW(ST_VISIBILITY
)(-1))
524 other
= esym
->st_other
; /* in case we have to patch esym */
525 if (shndx
== SHN_UNDEF
) {
526 /* ignore adding of undefined symbol if the
527 corresponding symbol is already defined */
528 } else if (sym_bind
== STB_GLOBAL
&& esym_bind
== STB_WEAK
) {
529 /* global overrides weak, so patch */
531 } else if (sym_bind
== STB_WEAK
&& esym_bind
== STB_GLOBAL
) {
532 /* weak is ignored if already global */
533 } else if (sym_bind
== STB_WEAK
&& esym_bind
== STB_WEAK
) {
534 /* keep first-found weak definition, ignore subsequents */
535 } else if (sym_vis
== STV_HIDDEN
|| sym_vis
== STV_INTERNAL
) {
536 /* ignore hidden symbols after */
537 } else if ((esym
->st_shndx
== SHN_COMMON
538 || esym
->st_shndx
== bss_section
->sh_num
)
539 && (shndx
< SHN_LORESERVE
540 && shndx
!= bss_section
->sh_num
)) {
541 /* data symbol gets precedence over common/bss */
543 } else if (shndx
== SHN_COMMON
|| shndx
== bss_section
->sh_num
) {
544 /* data symbol keeps precedence over common/bss */
545 } else if (s
->sh_flags
& SHF_DYNSYM
) {
546 /* we accept that two DLL define the same symbol */
547 } else if (esym
->st_other
& ST_ASM_SET
) {
548 /* If the existing symbol came from an asm .set
553 printf("new_bind=%x new_shndx=%x new_vis=%x old_bind=%x old_shndx=%x old_vis=%x\n",
554 sym_bind
, shndx
, new_vis
, esym_bind
, esym
->st_shndx
, esym_vis
);
556 tcc_error_noabort("'%s' defined twice", name
);
560 esym
->st_info
= ELFW(ST_INFO
)(sym_bind
, sym_type
);
561 esym
->st_shndx
= shndx
;
563 esym
->st_value
= value
;
564 esym
->st_size
= size
;
565 esym
->st_other
= other
;
569 sym_index
= put_elf_sym(s
, value
, size
,
570 ELFW(ST_INFO
)(sym_bind
, sym_type
), other
,
577 ST_FUNC
void put_elf_reloca(Section
*symtab
, Section
*s
, unsigned long offset
,
578 int type
, int symbol
, addr_t addend
)
586 /* if no relocation section, create it */
587 snprintf(buf
, sizeof(buf
), REL_SECTION_FMT
, s
->name
);
588 /* if the symtab is allocated, then we consider the relocation
590 sr
= new_section(tcc_state
, buf
, SHT_RELX
, symtab
->sh_flags
);
591 sr
->sh_entsize
= sizeof(ElfW_Rel
);
593 sr
->sh_info
= s
->sh_num
;
596 rel
= section_ptr_add(sr
, sizeof(ElfW_Rel
));
597 rel
->r_offset
= offset
;
598 rel
->r_info
= ELFW(R_INFO
)(symbol
, type
);
599 #if SHT_RELX == SHT_RELA
600 rel
->r_addend
= addend
;
603 tcc_error("non-zero addend on REL architecture");
607 ST_FUNC
void put_elf_reloc(Section
*symtab
, Section
*s
, unsigned long offset
,
608 int type
, int symbol
)
610 put_elf_reloca(symtab
, s
, offset
, type
, symbol
, 0);
613 /* Remove relocations for section S->reloc starting at oldrelocoffset
614 that are to the same place, retaining the last of them. As side effect
615 the relocations are sorted. Possibly reduces the number of relocs. */
616 ST_FUNC
void squeeze_multi_relocs(Section
*s
, size_t oldrelocoffset
)
618 Section
*sr
= s
->reloc
;
623 if (oldrelocoffset
+ sizeof(*r
) >= sr
->data_offset
)
625 /* The relocs we're dealing with are the result of initializer parsing.
626 So they will be mostly in order and there aren't many of them.
627 Secondly we need a stable sort (which qsort isn't). We use
628 a simple insertion sort. */
629 for (a
= oldrelocoffset
+ sizeof(*r
); a
< sr
->data_offset
; a
+= sizeof(*r
)) {
630 ssize_t i
= a
- sizeof(*r
);
631 addr
= ((ElfW_Rel
*)(sr
->data
+ a
))->r_offset
;
632 for (; i
>= (ssize_t
)oldrelocoffset
&&
633 ((ElfW_Rel
*)(sr
->data
+ i
))->r_offset
> addr
; i
-= sizeof(*r
)) {
634 ElfW_Rel tmp
= *(ElfW_Rel
*)(sr
->data
+ a
);
635 *(ElfW_Rel
*)(sr
->data
+ a
) = *(ElfW_Rel
*)(sr
->data
+ i
);
636 *(ElfW_Rel
*)(sr
->data
+ i
) = tmp
;
640 r
= (ElfW_Rel
*)(sr
->data
+ oldrelocoffset
);
642 for (; r
< (ElfW_Rel
*)(sr
->data
+ sr
->data_offset
); r
++) {
643 if (dest
->r_offset
!= r
->r_offset
)
647 sr
->data_offset
= (unsigned char*)dest
- sr
->data
+ sizeof(*r
);
650 /* put stab debug information */
652 ST_FUNC
void put_stabs(const char *str
, int type
, int other
, int desc
,
657 sym
= section_ptr_add(stab_section
, sizeof(Stab_Sym
));
659 sym
->n_strx
= put_elf_str(stabstr_section
, str
);
664 sym
->n_other
= other
;
666 sym
->n_value
= value
;
669 ST_FUNC
void put_stabs_r(const char *str
, int type
, int other
, int desc
,
670 unsigned long value
, Section
*sec
, int sym_index
)
672 put_stabs(str
, type
, other
, desc
, value
);
673 put_elf_reloc(symtab_section
, stab_section
,
674 stab_section
->data_offset
- sizeof(unsigned int),
675 R_DATA_32
, sym_index
);
678 ST_FUNC
void put_stabn(int type
, int other
, int desc
, int value
)
680 put_stabs(NULL
, type
, other
, desc
, value
);
683 ST_FUNC
void put_stabd(int type
, int other
, int desc
)
685 put_stabs(NULL
, type
, other
, desc
, 0);
688 ST_FUNC
struct sym_attr
*get_sym_attr(TCCState
*s1
, int index
, int alloc
)
691 struct sym_attr
*tab
;
693 if (index
>= s1
->nb_sym_attrs
) {
695 return s1
->sym_attrs
;
696 /* find immediately bigger power of 2 and reallocate array */
700 tab
= tcc_realloc(s1
->sym_attrs
, n
* sizeof(*s1
->sym_attrs
));
702 memset(s1
->sym_attrs
+ s1
->nb_sym_attrs
, 0,
703 (n
- s1
->nb_sym_attrs
) * sizeof(*s1
->sym_attrs
));
704 s1
->nb_sym_attrs
= n
;
706 return &s1
->sym_attrs
[index
];
709 /* Browse each elem of type <type> in section <sec> starting at elem <startoff>
710 using variable <elem> */
711 #define for_each_elem(sec, startoff, elem, type) \
712 for (elem = (type *) sec->data + startoff; \
713 elem < (type *) (sec->data + sec->data_offset); elem++)
715 /* In an ELF file symbol table, the local symbols must appear below
716 the global and weak ones. Since TCC cannot sort it while generating
717 the code, we must do it after. All the relocation tables are also
718 modified to take into account the symbol table sorting */
719 static void sort_syms(TCCState
*s1
, Section
*s
)
721 int *old_to_new_syms
;
729 nb_syms
= s
->data_offset
/ sizeof(ElfW(Sym
));
730 new_syms
= tcc_malloc(nb_syms
* sizeof(ElfW(Sym
)));
731 old_to_new_syms
= tcc_malloc(nb_syms
* sizeof(int));
733 /* first pass for local symbols */
734 p
= (ElfW(Sym
) *)s
->data
;
736 for(i
= 0; i
< nb_syms
; i
++) {
737 if (ELFW(ST_BIND
)(p
->st_info
) == STB_LOCAL
) {
738 old_to_new_syms
[i
] = q
- new_syms
;
743 /* save the number of local symbols in section header */
744 if( s
->sh_size
) /* this 'if' makes IDA happy */
745 s
->sh_info
= q
- new_syms
;
747 /* then second pass for non local symbols */
748 p
= (ElfW(Sym
) *)s
->data
;
749 for(i
= 0; i
< nb_syms
; i
++) {
750 if (ELFW(ST_BIND
)(p
->st_info
) != STB_LOCAL
) {
751 old_to_new_syms
[i
] = q
- new_syms
;
757 /* we copy the new symbols to the old */
758 memcpy(s
->data
, new_syms
, nb_syms
* sizeof(ElfW(Sym
)));
761 /* now we modify all the relocations */
762 for(i
= 1; i
< s1
->nb_sections
; i
++) {
763 sr
= s1
->sections
[i
];
764 if (sr
->sh_type
== SHT_RELX
&& sr
->link
== s
) {
765 for_each_elem(sr
, 0, rel
, ElfW_Rel
) {
766 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
767 type
= ELFW(R_TYPE
)(rel
->r_info
);
768 sym_index
= old_to_new_syms
[sym_index
];
769 rel
->r_info
= ELFW(R_INFO
)(sym_index
, type
);
774 tcc_free(old_to_new_syms
);
777 /* relocate symbol table, resolve undefined symbols if do_resolve is
778 true and output error if undefined symbol. */
779 ST_FUNC
void relocate_syms(TCCState
*s1
, Section
*symtab
, int do_resolve
)
782 int sym_bind
, sh_num
;
785 for_each_elem(symtab
, 1, sym
, ElfW(Sym
)) {
786 sh_num
= sym
->st_shndx
;
787 if (sh_num
== SHN_UNDEF
) {
788 name
= (char *) s1
->symtab
->link
->data
+ sym
->st_name
;
789 /* Use ld.so to resolve symbol for us (for tcc -run) */
791 #if defined TCC_IS_NATIVE && !defined TCC_TARGET_PE
792 void *addr
= dlsym(RTLD_DEFAULT
, name
);
794 sym
->st_value
= (addr_t
) addr
;
796 printf ("relocate_sym: %s -> 0x%lx\n", name
, sym
->st_value
);
801 /* if dynamic symbol exist, it will be used in relocate_section */
802 } else if (s1
->dynsym
&& find_elf_sym(s1
->dynsym
, name
))
804 /* XXX: _fp_hw seems to be part of the ABI, so we ignore
806 if (!strcmp(name
, "_fp_hw"))
808 /* only weak symbols are accepted to be undefined. Their
810 sym_bind
= ELFW(ST_BIND
)(sym
->st_info
);
811 if (sym_bind
== STB_WEAK
)
814 tcc_error_noabort("undefined symbol '%s'", name
);
815 } else if (sh_num
< SHN_LORESERVE
) {
816 /* add section base */
817 sym
->st_value
+= s1
->sections
[sym
->st_shndx
]->sh_addr
;
823 /* relocate a given section (CPU dependent) by applying the relocations
824 in the associated relocation section */
825 ST_FUNC
void relocate_section(TCCState
*s1
, Section
*s
)
827 Section
*sr
= s
->reloc
;
836 for_each_elem(sr
, 0, rel
, ElfW_Rel
) {
837 ptr
= s
->data
+ rel
->r_offset
;
838 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
839 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
840 type
= ELFW(R_TYPE
)(rel
->r_info
);
842 #if SHT_RELX == SHT_RELA
843 tgt
+= rel
->r_addend
;
845 addr
= s
->sh_addr
+ rel
->r_offset
;
846 relocate(s1
, rel
, type
, ptr
, addr
, tgt
);
848 /* if the relocation is allocated, we change its symbol table */
849 if (sr
->sh_flags
& SHF_ALLOC
)
850 sr
->link
= s1
->dynsym
;
853 /* relocate relocation table in 'sr' */
854 static void relocate_rel(TCCState
*s1
, Section
*sr
)
859 s
= s1
->sections
[sr
->sh_info
];
860 for_each_elem(sr
, 0, rel
, ElfW_Rel
)
861 rel
->r_offset
+= s
->sh_addr
;
864 /* count the number of dynamic relocations so that we can reserve
866 static int prepare_dynamic_rel(TCCState
*s1
, Section
*sr
)
872 for_each_elem(sr
, 0, rel
, ElfW_Rel
) {
873 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
874 int sym_index
= ELFW(R_SYM
)(rel
->r_info
);
876 type
= ELFW(R_TYPE
)(rel
->r_info
);
878 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
879 #if defined(TCC_TARGET_I386)
881 if (!get_sym_attr(s1
, sym_index
, 0)->dyn_index
882 && ((ElfW(Sym
)*)symtab_section
->data
+ sym_index
)->st_shndx
== SHN_UNDEF
) {
883 /* don't fixup unresolved (weak) symbols */
884 rel
->r_info
= ELFW(R_INFO
)(sym_index
, R_386_RELATIVE
);
887 #elif defined(TCC_TARGET_X86_64)
894 #if defined(TCC_TARGET_I386)
896 #elif defined(TCC_TARGET_X86_64)
899 if (get_sym_attr(s1
, sym_index
, 0)->dyn_index
)
908 /* allocate the section */
909 sr
->sh_flags
|= SHF_ALLOC
;
910 sr
->sh_size
= count
* sizeof(ElfW_Rel
);
915 static void build_got(TCCState
*s1
)
917 /* if no got, then create it */
918 s1
->got
= new_section(s1
, ".got", SHT_PROGBITS
, SHF_ALLOC
| SHF_WRITE
);
919 s1
->got
->sh_entsize
= 4;
920 set_elf_sym(symtab_section
, 0, 4, ELFW(ST_INFO
)(STB_GLOBAL
, STT_OBJECT
),
921 0, s1
->got
->sh_num
, "_GLOBAL_OFFSET_TABLE_");
922 /* keep space for _DYNAMIC pointer and two dummy got entries */
923 section_ptr_add(s1
->got
, 3 * PTR_SIZE
);
926 /* Create a GOT and (for function call) a PLT entry corresponding to a symbol
927 in s1->symtab. When creating the dynamic symbol table entry for the GOT
928 relocation, use 'size' and 'info' for the corresponding symbol metadata.
929 Returns the offset of the GOT or (if any) PLT entry. */
930 static struct sym_attr
* put_got_entry(TCCState
*s1
, int dyn_reloc_type
,
932 int info
, int sym_index
)
937 struct sym_attr
*attr
;
942 need_plt_entry
= (dyn_reloc_type
== R_JMP_SLOT
);
943 attr
= get_sym_attr(s1
, sym_index
, 1);
945 /* In case a function is both called and its address taken 2 GOT entries
946 are created, one for taking the address (GOT) and the other for the PLT
948 if (need_plt_entry
? attr
->plt_offset
: attr
->got_offset
)
951 /* create the GOT entry */
952 got_offset
= s1
->got
->data_offset
;
953 section_ptr_add(s1
->got
, PTR_SIZE
);
955 /* Create the GOT relocation that will insert the address of the object or
956 function of interest in the GOT entry. This is a static relocation for
957 memory output (dlsym will give us the address of symbols) and dynamic
958 relocation otherwise (executable and DLLs). The relocation should be
959 done lazily for GOT entry with *_JUMP_SLOT relocation type (the one
960 associated to a PLT entry) but is currently done at load time for an
963 sym
= &((ElfW(Sym
) *) symtab_section
->data
)[sym_index
];
964 name
= (char *) symtab_section
->link
->data
+ sym
->st_name
;
967 if (ELFW(ST_BIND
)(sym
->st_info
) == STB_LOCAL
) {
968 /* Hack alarm. We don't want to emit dynamic symbols
969 and symbol based relocs for STB_LOCAL symbols, but rather
970 want to resolve them directly. At this point the symbol
971 values aren't final yet, so we must defer this. We will later
972 have to create a RELATIVE reloc anyway, so we misuse the
973 relocation slot to smuggle the symbol reference until
974 fill_local_got_entries. Not that the sym_index is
975 relative to symtab_section, not s1->dynsym! Nevertheless
976 we use s1->dyn_sym so that if this is the first call
977 that got->reloc is correctly created. Also note that
978 RELATIVE relocs are not normally created for the .got,
979 so the types serves as a marker for later (and is retained
980 also for the final output, which is okay because then the
981 got is just normal data). */
982 put_elf_reloc(s1
->dynsym
, s1
->got
, got_offset
, R_RELATIVE
,
985 if (0 == attr
->dyn_index
)
986 attr
->dyn_index
= set_elf_sym(s1
->dynsym
, sym
->st_value
, size
,
987 info
, 0, sym
->st_shndx
, name
);
988 put_elf_reloc(s1
->dynsym
, s1
->got
, got_offset
, dyn_reloc_type
,
992 put_elf_reloc(symtab_section
, s1
->got
, got_offset
, dyn_reloc_type
,
996 if (need_plt_entry
) {
998 s1
->plt
= new_section(s1
, ".plt", SHT_PROGBITS
,
999 SHF_ALLOC
| SHF_EXECINSTR
);
1000 s1
->plt
->sh_entsize
= 4;
1003 attr
->plt_offset
= create_plt_entry(s1
, got_offset
, attr
);
1005 /* create a symbol 'sym@plt' for the PLT jump vector */
1007 if (len
> sizeof plt_name
- 5)
1008 len
= sizeof plt_name
- 5;
1009 memcpy(plt_name
, name
, len
);
1010 strcpy(plt_name
+ len
, "@plt");
1011 attr
->plt_sym
= put_elf_sym(s1
->symtab
, attr
->plt_offset
, sym
->st_size
,
1012 ELFW(ST_INFO
)(STB_GLOBAL
, STT_FUNC
), 0, s1
->plt
->sh_num
, plt_name
);
1015 attr
->got_offset
= got_offset
;
1021 /* build GOT and PLT entries */
1022 ST_FUNC
void build_got_entries(TCCState
*s1
)
1027 int i
, type
, gotplt_entry
, reloc_type
, sym_index
;
1028 struct sym_attr
*attr
;
1030 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1031 s
= s1
->sections
[i
];
1032 if (s
->sh_type
!= SHT_RELX
)
1034 /* no need to handle got relocations */
1035 if (s
->link
!= symtab_section
)
1037 for_each_elem(s
, 0, rel
, ElfW_Rel
) {
1038 type
= ELFW(R_TYPE
)(rel
->r_info
);
1039 gotplt_entry
= gotplt_entry_type(type
);
1040 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
1041 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
1043 if (gotplt_entry
== NO_GOTPLT_ENTRY
) {
1047 /* Automatically create PLT/GOT [entry] if it is an undefined
1048 reference (resolved at runtime), or the symbol is absolute,
1049 probably created by tcc_add_symbol, and thus on 64-bit
1050 targets might be too far from application code. */
1051 if (gotplt_entry
== AUTO_GOTPLT_ENTRY
) {
1052 if (sym
->st_shndx
== SHN_UNDEF
) {
1055 if (s1
->output_type
== TCC_OUTPUT_DLL
&& ! PCRELATIVE_DLLPLT
)
1057 /* Relocations for UNDEF symbols would normally need
1058 to be transferred into the executable or shared object.
1059 If that were done AUTO_GOTPLT_ENTRY wouldn't exist.
1060 But TCC doesn't do that (at least for exes), so we
1061 need to resolve all such relocs locally. And that
1062 means PLT slots for functions in DLLs and COPY relocs for
1063 data symbols. COPY relocs were generated in
1064 bind_exe_dynsyms (and the symbol adjusted to be defined),
1065 and for functions we were generated a dynamic symbol
1066 of function type. */
1068 /* dynsym isn't set for -run :-/ */
1069 dynindex
= get_sym_attr(s1
, sym_index
, 0)->dyn_index
;
1070 esym
= (ElfW(Sym
) *)s1
->dynsym
->data
+ dynindex
;
1072 && (ELFW(ST_TYPE
)(esym
->st_info
) == STT_FUNC
1073 || (ELFW(ST_TYPE
)(esym
->st_info
) == STT_NOTYPE
1074 && ELFW(ST_TYPE
)(sym
->st_info
) == STT_FUNC
)))
1077 } else if (!(sym
->st_shndx
== SHN_ABS
1078 #ifndef TCC_TARGET_ARM
1085 #ifdef TCC_TARGET_X86_64
1086 if ((type
== R_X86_64_PLT32
|| type
== R_X86_64_PC32
) &&
1087 (ELFW(ST_VISIBILITY
)(sym
->st_other
) != STV_DEFAULT
||
1088 ELFW(ST_BIND
)(sym
->st_info
) == STB_LOCAL
)) {
1089 rel
->r_info
= ELFW(R_INFO
)(sym_index
, R_X86_64_PC32
);
1093 if (code_reloc(type
)) {
1095 reloc_type
= R_JMP_SLOT
;
1097 reloc_type
= R_GLOB_DAT
;
1102 if (gotplt_entry
== BUILD_GOT_ONLY
)
1105 attr
= put_got_entry(s1
, reloc_type
, sym
->st_size
, sym
->st_info
,
1108 if (reloc_type
== R_JMP_SLOT
)
1109 rel
->r_info
= ELFW(R_INFO
)(attr
->plt_sym
, type
);
1114 /* put dynamic tag */
1115 static void put_dt(Section
*dynamic
, int dt
, addr_t val
)
1118 dyn
= section_ptr_add(dynamic
, sizeof(ElfW(Dyn
)));
1120 dyn
->d_un
.d_val
= val
;
1123 #ifndef TCC_TARGET_PE
1124 static void add_init_array_defines(TCCState
*s1
, const char *section_name
)
1128 char sym_start
[1024];
1131 snprintf(sym_start
, sizeof(sym_start
), "__%s_start", section_name
+ 1);
1132 snprintf(sym_end
, sizeof(sym_end
), "__%s_end", section_name
+ 1);
1134 s
= find_section(s1
, section_name
);
1139 end_offset
= s
->data_offset
;
1142 set_elf_sym(symtab_section
,
1144 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1145 s
->sh_num
, sym_start
);
1146 set_elf_sym(symtab_section
,
1148 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1149 s
->sh_num
, sym_end
);
1152 static int tcc_add_support(TCCState
*s1
, const char *filename
)
1155 snprintf(buf
, sizeof(buf
), "%s/%s", s1
->tcc_lib_path
, filename
);
1156 return tcc_add_file(s1
, buf
);
1160 ST_FUNC
void tcc_add_bcheck(TCCState
*s1
)
1162 #ifdef CONFIG_TCC_BCHECK
1166 if (0 == s1
->do_bounds_check
)
1168 /* XXX: add an object file to do that */
1169 ptr
= section_ptr_add(bounds_section
, sizeof(*ptr
));
1171 set_elf_sym(symtab_section
, 0, 0,
1172 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1173 bounds_section
->sh_num
, "__bounds_start");
1174 /* pull bcheck.o from libtcc1.a */
1175 sym_index
= set_elf_sym(symtab_section
, 0, 0,
1176 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1177 SHN_UNDEF
, "__bound_init");
1178 if (s1
->output_type
!= TCC_OUTPUT_MEMORY
) {
1179 /* add 'call __bound_init()' in .init section */
1180 Section
*init_section
= find_section(s1
, ".init");
1181 unsigned char *pinit
= section_ptr_add(init_section
, 5);
1183 write32le(pinit
+ 1, -4);
1184 put_elf_reloc(symtab_section
, init_section
,
1185 init_section
->data_offset
- 4, R_386_PC32
, sym_index
);
1186 /* R_386_PC32 = R_X86_64_PC32 = 2 */
1191 /* add tcc runtime libraries */
1192 ST_FUNC
void tcc_add_runtime(TCCState
*s1
)
1196 tcc_add_pragma_libs(s1
);
1197 #ifndef TCC_TARGET_PE
1199 if (!s1
->nostdlib
) {
1200 tcc_add_library_err(s1
, "c");
1202 if (!s1
->static_link
) {
1203 if (TCC_LIBGCC
[0] == '/')
1204 tcc_add_file(s1
, TCC_LIBGCC
);
1206 tcc_add_dll(s1
, TCC_LIBGCC
, 0);
1209 tcc_add_support(s1
, TCC_LIBTCC1
);
1210 /* add crt end if not memory output */
1211 if (s1
->output_type
!= TCC_OUTPUT_MEMORY
)
1212 tcc_add_crt(s1
, "crtn.o");
1217 /* add various standard linker symbols (must be done after the
1218 sections are filled (for example after allocating common
1220 static void tcc_add_linker_symbols(TCCState
*s1
)
1226 set_elf_sym(symtab_section
,
1227 text_section
->data_offset
, 0,
1228 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1229 text_section
->sh_num
, "_etext");
1230 set_elf_sym(symtab_section
,
1231 data_section
->data_offset
, 0,
1232 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1233 data_section
->sh_num
, "_edata");
1234 set_elf_sym(symtab_section
,
1235 bss_section
->data_offset
, 0,
1236 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1237 bss_section
->sh_num
, "_end");
1238 #ifndef TCC_TARGET_PE
1239 /* horrible new standard ldscript defines */
1240 add_init_array_defines(s1
, ".preinit_array");
1241 add_init_array_defines(s1
, ".init_array");
1242 add_init_array_defines(s1
, ".fini_array");
1245 /* add start and stop symbols for sections whose name can be
1247 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1248 s
= s1
->sections
[i
];
1249 if (s
->sh_type
== SHT_PROGBITS
&&
1250 (s
->sh_flags
& SHF_ALLOC
)) {
1254 /* check if section name can be expressed in C */
1260 if (!isid(ch
) && !isnum(ch
))
1264 snprintf(buf
, sizeof(buf
), "__start_%s", s
->name
);
1265 set_elf_sym(symtab_section
,
1267 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1269 snprintf(buf
, sizeof(buf
), "__stop_%s", s
->name
);
1270 set_elf_sym(symtab_section
,
1272 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1279 ST_FUNC
void resolve_common_syms(TCCState
*s1
)
1283 /* Allocate common symbols in BSS. */
1284 for_each_elem(symtab_section
, 1, sym
, ElfW(Sym
)) {
1285 if (sym
->st_shndx
== SHN_COMMON
) {
1286 /* symbol alignment is in st_value for SHN_COMMONs */
1287 sym
->st_value
= section_add(bss_section
, sym
->st_size
,
1289 sym
->st_shndx
= bss_section
->sh_num
;
1293 /* Now assign linker provided symbols their value. */
1294 tcc_add_linker_symbols(s1
);
1297 static void tcc_output_binary(TCCState
*s1
, FILE *f
,
1298 const int *sec_order
)
1301 int i
, offset
, size
;
1304 for(i
=1;i
<s1
->nb_sections
;i
++) {
1305 s
= s1
->sections
[sec_order
[i
]];
1306 if (s
->sh_type
!= SHT_NOBITS
&&
1307 (s
->sh_flags
& SHF_ALLOC
)) {
1308 while (offset
< s
->sh_offset
) {
1313 fwrite(s
->data
, 1, size
, f
);
1319 ST_FUNC
void fill_got_entry(TCCState
*s1
, ElfW_Rel
*rel
)
1321 int sym_index
= ELFW(R_SYM
) (rel
->r_info
);
1322 ElfW(Sym
) *sym
= &((ElfW(Sym
) *) symtab_section
->data
)[sym_index
];
1323 struct sym_attr
*attr
= get_sym_attr(s1
, sym_index
, 0);
1324 unsigned offset
= attr
->got_offset
;
1328 section_reserve(s1
->got
, offset
+ PTR_SIZE
);
1329 #ifdef TCC_TARGET_X86_64
1330 write64le(s1
->got
->data
+ offset
, sym
->st_value
);
1332 write32le(s1
->got
->data
+ offset
, sym
->st_value
);
1336 /* Perform relocation to GOT or PLT entries */
1337 ST_FUNC
void fill_got(TCCState
*s1
)
1343 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1344 s
= s1
->sections
[i
];
1345 if (s
->sh_type
!= SHT_RELX
)
1347 /* no need to handle got relocations */
1348 if (s
->link
!= symtab_section
)
1350 for_each_elem(s
, 0, rel
, ElfW_Rel
) {
1351 switch (ELFW(R_TYPE
) (rel
->r_info
)) {
1352 case R_X86_64_GOT32
:
1353 case R_X86_64_GOTPCREL
:
1354 case R_X86_64_GOTPCRELX
:
1355 case R_X86_64_REX_GOTPCRELX
:
1356 case R_X86_64_PLT32
:
1357 fill_got_entry(s1
, rel
);
1364 /* See put_got_entry for a description. This is the second stage
1365 where GOT references to local defined symbols are rewritten. */
1366 static void fill_local_got_entries(TCCState
*s1
)
1369 if (!s1
->got
->reloc
)
1371 for_each_elem(s1
->got
->reloc
, 0, rel
, ElfW_Rel
) {
1372 if (ELFW(R_TYPE
)(rel
->r_info
) == R_RELATIVE
) {
1373 int sym_index
= ELFW(R_SYM
) (rel
->r_info
);
1374 ElfW(Sym
) *sym
= &((ElfW(Sym
) *) symtab_section
->data
)[sym_index
];
1375 struct sym_attr
*attr
= get_sym_attr(s1
, sym_index
, 0);
1376 unsigned offset
= attr
->got_offset
;
1377 if (offset
!= rel
->r_offset
- s1
->got
->sh_addr
)
1378 tcc_error_noabort("huh");
1379 rel
->r_info
= ELFW(R_INFO
)(0, R_RELATIVE
);
1380 #if SHT_RELX == SHT_RELA
1381 rel
->r_addend
= sym
->st_value
;
1383 /* All our REL architectures also happen to be 32bit LE. */
1384 write32le(s1
->got
->data
+ offset
, sym
->st_value
);
1390 /* Bind symbols of executable: resolve undefined symbols from exported symbols
1391 in shared libraries and export non local defined symbols to shared libraries
1392 if -rdynamic switch was given on command line */
1393 static void bind_exe_dynsyms(TCCState
*s1
)
1396 int sym_index
, index
;
1397 ElfW(Sym
) *sym
, *esym
;
1400 /* Resolve undefined symbols from dynamic symbols. When there is a match:
1401 - if STT_FUNC or STT_GNU_IFUNC symbol -> add it in PLT
1402 - if STT_OBJECT symbol -> add it in .bss section with suitable reloc */
1403 for_each_elem(symtab_section
, 1, sym
, ElfW(Sym
)) {
1404 if (sym
->st_shndx
== SHN_UNDEF
) {
1405 name
= (char *) symtab_section
->link
->data
+ sym
->st_name
;
1406 sym_index
= find_elf_sym(s1
->dynsymtab_section
, name
);
1408 esym
= &((ElfW(Sym
) *)s1
->dynsymtab_section
->data
)[sym_index
];
1409 type
= ELFW(ST_TYPE
)(esym
->st_info
);
1410 if ((type
== STT_FUNC
) || (type
== STT_GNU_IFUNC
)) {
1411 /* Indirect functions shall have STT_FUNC type in executable
1412 * dynsym section. Indeed, a dlsym call following a lazy
1413 * resolution would pick the symbol value from the
1414 * executable dynsym entry which would contain the address
1415 * of the function wanted by the caller of dlsym instead of
1416 * the address of the function that would return that
1419 = put_elf_sym(s1
->dynsym
, 0, esym
->st_size
,
1420 ELFW(ST_INFO
)(STB_GLOBAL
,STT_FUNC
), 0, 0,
1422 int index
= sym
- (ElfW(Sym
) *) symtab_section
->data
;
1423 get_sym_attr(s1
, index
, 1)->dyn_index
= dynindex
;
1424 } else if (type
== STT_OBJECT
) {
1425 unsigned long offset
;
1427 offset
= bss_section
->data_offset
;
1428 /* XXX: which alignment ? */
1429 offset
= (offset
+ 16 - 1) & -16;
1430 set_elf_sym (s1
->symtab
, offset
, esym
->st_size
,
1431 esym
->st_info
, 0, bss_section
->sh_num
, name
);
1432 index
= put_elf_sym(s1
->dynsym
, offset
, esym
->st_size
,
1433 esym
->st_info
, 0, bss_section
->sh_num
,
1436 /* Ensure R_COPY works for weak symbol aliases */
1437 if (ELFW(ST_BIND
)(esym
->st_info
) == STB_WEAK
) {
1438 for_each_elem(s1
->dynsymtab_section
, 1, dynsym
, ElfW(Sym
)) {
1439 if ((dynsym
->st_value
== esym
->st_value
)
1440 && (ELFW(ST_BIND
)(dynsym
->st_info
) == STB_GLOBAL
)) {
1441 char *dynname
= (char *) s1
->dynsymtab_section
->link
->data
1443 put_elf_sym(s1
->dynsym
, offset
, dynsym
->st_size
,
1445 bss_section
->sh_num
, dynname
);
1451 put_elf_reloc(s1
->dynsym
, bss_section
,
1452 offset
, R_COPY
, index
);
1453 offset
+= esym
->st_size
;
1454 bss_section
->data_offset
= offset
;
1457 /* STB_WEAK undefined symbols are accepted */
1458 /* XXX: _fp_hw seems to be part of the ABI, so we ignore it */
1459 if (ELFW(ST_BIND
)(sym
->st_info
) == STB_WEAK
||
1460 !strcmp(name
, "_fp_hw")) {
1462 tcc_error_noabort("undefined symbol '%s'", name
);
1465 } else if (s1
->rdynamic
&& ELFW(ST_BIND
)(sym
->st_info
) != STB_LOCAL
) {
1466 /* if -rdynamic option, then export all non local symbols */
1467 name
= (char *) symtab_section
->link
->data
+ sym
->st_name
;
1468 set_elf_sym(s1
->dynsym
, sym
->st_value
, sym
->st_size
, sym
->st_info
,
1469 0, sym
->st_shndx
, name
);
1474 /* Bind symbols of libraries: export all non local symbols of executable that
1475 are referenced by shared libraries. The reason is that the dynamic loader
1476 search symbol first in executable and then in libraries. Therefore a
1477 reference to a symbol already defined by a library can still be resolved by
1478 a symbol in the executable. */
1479 static void bind_libs_dynsyms(TCCState
*s1
)
1483 ElfW(Sym
) *sym
, *esym
;
1485 for_each_elem(s1
->dynsymtab_section
, 1, esym
, ElfW(Sym
)) {
1486 name
= (char *) s1
->dynsymtab_section
->link
->data
+ esym
->st_name
;
1487 sym_index
= find_elf_sym(symtab_section
, name
);
1488 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
1489 if (sym_index
&& sym
->st_shndx
!= SHN_UNDEF
1490 && ELFW(ST_BIND
)(sym
->st_info
) != STB_LOCAL
) {
1491 set_elf_sym(s1
->dynsym
, sym
->st_value
, sym
->st_size
,
1492 sym
->st_info
, 0, sym
->st_shndx
, name
);
1493 } else if (esym
->st_shndx
== SHN_UNDEF
) {
1494 /* weak symbols can stay undefined */
1495 if (ELFW(ST_BIND
)(esym
->st_info
) != STB_WEAK
)
1496 tcc_warning("undefined dynamic symbol '%s'", name
);
1501 /* Export all non local symbols. This is used by shared libraries so that the
1502 non local symbols they define can resolve a reference in another shared
1503 library or in the executable. Correspondingly, it allows undefined local
1504 symbols to be resolved by other shared libraries or by the executable. */
1505 static void export_global_syms(TCCState
*s1
)
1507 int dynindex
, index
;
1511 for_each_elem(symtab_section
, 1, sym
, ElfW(Sym
)) {
1512 if (ELFW(ST_BIND
)(sym
->st_info
) != STB_LOCAL
) {
1513 name
= (char *) symtab_section
->link
->data
+ sym
->st_name
;
1514 dynindex
= put_elf_sym(s1
->dynsym
, sym
->st_value
, sym
->st_size
,
1515 sym
->st_info
, 0, sym
->st_shndx
, name
);
1516 index
= sym
- (ElfW(Sym
) *) symtab_section
->data
;
1517 get_sym_attr(s1
, index
, 1)->dyn_index
= dynindex
;
1522 /* Allocate strings for section names and decide if an unallocated section
1524 NOTE: the strsec section comes last, so its size is also correct ! */
1525 static int alloc_sec_names(TCCState
*s1
, int file_type
, Section
*strsec
)
1531 /* Allocate strings for section names */
1532 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1533 s
= s1
->sections
[i
];
1534 /* when generating a DLL, we include relocations but we may
1536 if (file_type
== TCC_OUTPUT_DLL
&&
1537 s
->sh_type
== SHT_RELX
&&
1538 !(s
->sh_flags
& SHF_ALLOC
) &&
1539 (s1
->sections
[s
->sh_info
]->sh_flags
& SHF_ALLOC
) &&
1540 prepare_dynamic_rel(s1
, s
)) {
1541 if (s1
->sections
[s
->sh_info
]->sh_flags
& SHF_EXECINSTR
)
1543 } else if ((s1
->do_debug
&& s
->sh_type
!= SHT_RELX
) ||
1544 file_type
== TCC_OUTPUT_OBJ
||
1545 (s
->sh_flags
& SHF_ALLOC
) ||
1546 i
== (s1
->nb_sections
- 1)) {
1547 /* we output all sections if debug or object file */
1548 s
->sh_size
= s
->data_offset
;
1550 if (s
->sh_size
|| (s
->sh_flags
& SHF_ALLOC
))
1551 s
->sh_name
= put_elf_str(strsec
, s
->name
);
1553 strsec
->sh_size
= strsec
->data_offset
;
1557 /* Info to be copied in dynamic section */
1561 unsigned long data_offset
;
1564 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1570 /* Assign sections to segments and decide how are sections laid out when loaded
1571 in memory. This function also fills corresponding program headers. */
1572 static int layout_sections(TCCState
*s1
, ElfW(Phdr
) *phdr
, int phnum
,
1573 Section
*interp
, Section
* strsec
,
1574 struct dyn_inf
*dyninf
, int *sec_order
)
1576 int i
, j
, k
, file_type
, sh_order_index
, file_offset
;
1577 unsigned long s_align
;
1583 file_type
= s1
->output_type
;
1586 if (s1
->output_format
== TCC_OUTPUT_FORMAT_ELF
)
1587 file_offset
= sizeof(ElfW(Ehdr
)) + phnum
* sizeof(ElfW(Phdr
));
1588 s_align
= ELF_PAGE_SIZE
;
1589 if (s1
->section_align
)
1590 s_align
= s1
->section_align
;
1593 if (s1
->has_text_addr
) {
1594 int a_offset
, p_offset
;
1595 addr
= s1
->text_addr
;
1596 /* we ensure that (addr % ELF_PAGE_SIZE) == file_offset %
1598 a_offset
= (int) (addr
& (s_align
- 1));
1599 p_offset
= file_offset
& (s_align
- 1);
1600 if (a_offset
< p_offset
)
1601 a_offset
+= s_align
;
1602 file_offset
+= (a_offset
- p_offset
);
1604 if (file_type
== TCC_OUTPUT_DLL
)
1607 addr
= ELF_START_ADDR
;
1608 /* compute address after headers */
1609 addr
+= (file_offset
& (s_align
- 1));
1613 /* Leave one program headers for the program interpreter and one for
1614 the program header table itself if needed. These are done later as
1615 they require section layout to be done first. */
1619 /* dynamic relocation table information, for .dynamic section */
1620 dyninf
->rel_addr
= dyninf
->rel_size
= 0;
1621 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1622 dyninf
->bss_addr
= dyninf
->bss_size
= 0;
1625 for(j
= 0; j
< 2; j
++) {
1626 ph
->p_type
= PT_LOAD
;
1628 ph
->p_flags
= PF_R
| PF_X
;
1630 ph
->p_flags
= PF_R
| PF_W
;
1631 ph
->p_align
= s_align
;
1633 /* Decide the layout of sections loaded in memory. This must
1634 be done before program headers are filled since they contain
1635 info about the layout. We do the following ordering: interp,
1636 symbol tables, relocations, progbits, nobits */
1637 /* XXX: do faster and simpler sorting */
1638 for(k
= 0; k
< 5; k
++) {
1639 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1640 s
= s1
->sections
[i
];
1641 /* compute if section should be included */
1643 if ((s
->sh_flags
& (SHF_ALLOC
| SHF_WRITE
)) !=
1647 if ((s
->sh_flags
& (SHF_ALLOC
| SHF_WRITE
)) !=
1648 (SHF_ALLOC
| SHF_WRITE
))
1654 } else if (s
->sh_type
== SHT_DYNSYM
||
1655 s
->sh_type
== SHT_STRTAB
||
1656 s
->sh_type
== SHT_HASH
) {
1659 } else if (s
->sh_type
== SHT_RELX
) {
1662 } else if (s
->sh_type
== SHT_NOBITS
) {
1669 sec_order
[sh_order_index
++] = i
;
1671 /* section matches: we align it and add its size */
1673 addr
= (addr
+ s
->sh_addralign
- 1) &
1674 ~(s
->sh_addralign
- 1);
1675 file_offset
+= (int) ( addr
- tmp
);
1676 s
->sh_offset
= file_offset
;
1679 /* update program header infos */
1680 if (ph
->p_offset
== 0) {
1681 ph
->p_offset
= file_offset
;
1683 ph
->p_paddr
= ph
->p_vaddr
;
1685 /* update dynamic relocation infos */
1686 if (s
->sh_type
== SHT_RELX
) {
1687 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1688 if (!strcmp(strsec
->data
+ s
->sh_name
, ".rel.got")) {
1689 dyninf
->rel_addr
= addr
;
1690 dyninf
->rel_size
+= s
->sh_size
; /* XXX only first rel. */
1692 if (!strcmp(strsec
->data
+ s
->sh_name
, ".rel.bss")) {
1693 dyninf
->bss_addr
= addr
;
1694 dyninf
->bss_size
= s
->sh_size
; /* XXX only first rel. */
1697 if (dyninf
->rel_size
== 0)
1698 dyninf
->rel_addr
= addr
;
1699 dyninf
->rel_size
+= s
->sh_size
;
1703 if (s
->sh_type
!= SHT_NOBITS
)
1704 file_offset
+= s
->sh_size
;
1708 /* Make the first PT_LOAD segment include the program
1709 headers itself (and the ELF header as well), it'll
1710 come out with same memory use but will make various
1711 tools like binutils strip work better. */
1712 ph
->p_offset
&= ~(ph
->p_align
- 1);
1713 ph
->p_vaddr
&= ~(ph
->p_align
- 1);
1714 ph
->p_paddr
&= ~(ph
->p_align
- 1);
1716 ph
->p_filesz
= file_offset
- ph
->p_offset
;
1717 ph
->p_memsz
= addr
- ph
->p_vaddr
;
1720 if (s1
->output_format
== TCC_OUTPUT_FORMAT_ELF
) {
1721 /* if in the middle of a page, we duplicate the page in
1722 memory so that one copy is RX and the other is RW */
1723 if ((addr
& (s_align
- 1)) != 0)
1726 addr
= (addr
+ s_align
- 1) & ~(s_align
- 1);
1727 file_offset
= (file_offset
+ s_align
- 1) & ~(s_align
- 1);
1733 /* all other sections come after */
1734 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1735 s
= s1
->sections
[i
];
1736 if (phnum
> 0 && (s
->sh_flags
& SHF_ALLOC
))
1738 sec_order
[sh_order_index
++] = i
;
1740 file_offset
= (file_offset
+ s
->sh_addralign
- 1) &
1741 ~(s
->sh_addralign
- 1);
1742 s
->sh_offset
= file_offset
;
1743 if (s
->sh_type
!= SHT_NOBITS
)
1744 file_offset
+= s
->sh_size
;
1750 static void fill_unloadable_phdr(ElfW(Phdr
) *phdr
, int phnum
, Section
*interp
,
1755 /* if interpreter, then add corresponding program header */
1759 ph
->p_type
= PT_PHDR
;
1760 ph
->p_offset
= sizeof(ElfW(Ehdr
));
1761 ph
->p_filesz
= ph
->p_memsz
= phnum
* sizeof(ElfW(Phdr
));
1762 ph
->p_vaddr
= interp
->sh_addr
- ph
->p_filesz
;
1763 ph
->p_paddr
= ph
->p_vaddr
;
1764 ph
->p_flags
= PF_R
| PF_X
;
1765 ph
->p_align
= 4; /* interp->sh_addralign; */
1768 ph
->p_type
= PT_INTERP
;
1769 ph
->p_offset
= interp
->sh_offset
;
1770 ph
->p_vaddr
= interp
->sh_addr
;
1771 ph
->p_paddr
= ph
->p_vaddr
;
1772 ph
->p_filesz
= interp
->sh_size
;
1773 ph
->p_memsz
= interp
->sh_size
;
1775 ph
->p_align
= interp
->sh_addralign
;
1778 /* if dynamic section, then add corresponding program header */
1780 ph
= &phdr
[phnum
- 1];
1782 ph
->p_type
= PT_DYNAMIC
;
1783 ph
->p_offset
= dynamic
->sh_offset
;
1784 ph
->p_vaddr
= dynamic
->sh_addr
;
1785 ph
->p_paddr
= ph
->p_vaddr
;
1786 ph
->p_filesz
= dynamic
->sh_size
;
1787 ph
->p_memsz
= dynamic
->sh_size
;
1788 ph
->p_flags
= PF_R
| PF_W
;
1789 ph
->p_align
= dynamic
->sh_addralign
;
1793 /* Fill the dynamic section with tags describing the address and size of
1795 static void fill_dynamic(TCCState
*s1
, struct dyn_inf
*dyninf
)
1797 Section
*dynamic
= dyninf
->dynamic
;
1799 /* put dynamic section entries */
1800 put_dt(dynamic
, DT_HASH
, s1
->dynsym
->hash
->sh_addr
);
1801 put_dt(dynamic
, DT_STRTAB
, dyninf
->dynstr
->sh_addr
);
1802 put_dt(dynamic
, DT_SYMTAB
, s1
->dynsym
->sh_addr
);
1803 put_dt(dynamic
, DT_STRSZ
, dyninf
->dynstr
->data_offset
);
1804 put_dt(dynamic
, DT_SYMENT
, sizeof(ElfW(Sym
)));
1806 put_dt(dynamic
, DT_RELA
, dyninf
->rel_addr
);
1807 put_dt(dynamic
, DT_RELASZ
, dyninf
->rel_size
);
1808 put_dt(dynamic
, DT_RELAENT
, sizeof(ElfW_Rel
));
1810 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1811 put_dt(dynamic
, DT_PLTGOT
, s1
->got
->sh_addr
);
1812 put_dt(dynamic
, DT_PLTRELSZ
, dyninf
->rel_size
);
1813 put_dt(dynamic
, DT_JMPREL
, dyninf
->rel_addr
);
1814 put_dt(dynamic
, DT_PLTREL
, DT_REL
);
1815 put_dt(dynamic
, DT_REL
, dyninf
->bss_addr
);
1816 put_dt(dynamic
, DT_RELSZ
, dyninf
->bss_size
);
1818 put_dt(dynamic
, DT_REL
, dyninf
->rel_addr
);
1819 put_dt(dynamic
, DT_RELSZ
, dyninf
->rel_size
);
1820 put_dt(dynamic
, DT_RELENT
, sizeof(ElfW_Rel
));
1824 put_dt(dynamic
, DT_DEBUG
, 0);
1825 put_dt(dynamic
, DT_NULL
, 0);
1828 /* Relocate remaining sections and symbols (that is those not related to
1830 static int final_sections_reloc(TCCState
*s1
)
1835 relocate_syms(s1
, s1
->symtab
, 0);
1837 if (s1
->nb_errors
!= 0)
1840 /* relocate sections */
1841 /* XXX: ignore sections with allocated relocations ? */
1842 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1843 s
= s1
->sections
[i
];
1844 if (s
->reloc
&& s
!= s1
->got
)
1845 relocate_section(s1
, s
);
1848 /* relocate relocation entries if the relocation tables are
1849 allocated in the executable */
1850 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1851 s
= s1
->sections
[i
];
1852 if ((s
->sh_flags
& SHF_ALLOC
) &&
1853 s
->sh_type
== SHT_RELX
) {
1854 relocate_rel(s1
, s
);
1860 /* Create an ELF file on disk.
1861 This function handle ELF specific layout requirements */
1862 static void tcc_output_elf(TCCState
*s1
, FILE *f
, int phnum
, ElfW(Phdr
) *phdr
,
1863 int file_offset
, int *sec_order
)
1865 int i
, shnum
, offset
, size
, file_type
;
1868 ElfW(Shdr
) shdr
, *sh
;
1870 file_type
= s1
->output_type
;
1871 shnum
= s1
->nb_sections
;
1873 memset(&ehdr
, 0, sizeof(ehdr
));
1876 ehdr
.e_phentsize
= sizeof(ElfW(Phdr
));
1877 ehdr
.e_phnum
= phnum
;
1878 ehdr
.e_phoff
= sizeof(ElfW(Ehdr
));
1882 file_offset
= (file_offset
+ 3) & -4;
1885 ehdr
.e_ident
[0] = ELFMAG0
;
1886 ehdr
.e_ident
[1] = ELFMAG1
;
1887 ehdr
.e_ident
[2] = ELFMAG2
;
1888 ehdr
.e_ident
[3] = ELFMAG3
;
1889 ehdr
.e_ident
[4] = ELFCLASSW
;
1890 ehdr
.e_ident
[5] = ELFDATA2LSB
;
1891 ehdr
.e_ident
[6] = EV_CURRENT
;
1892 #if !defined(TCC_TARGET_PE) && (defined(__FreeBSD__) || defined(__FreeBSD_kernel__))
1893 /* FIXME: should set only for freebsd _target_, but we exclude only PE target */
1894 ehdr
.e_ident
[EI_OSABI
] = ELFOSABI_FREEBSD
;
1896 #ifdef TCC_TARGET_ARM
1898 ehdr
.e_ident
[EI_OSABI
] = 0;
1899 ehdr
.e_flags
= EF_ARM_EABI_VER4
;
1900 if (file_type
== TCC_OUTPUT_EXE
|| file_type
== TCC_OUTPUT_DLL
)
1901 ehdr
.e_flags
|= EF_ARM_HASENTRY
;
1902 if (s1
->float_abi
== ARM_HARD_FLOAT
)
1903 ehdr
.e_flags
|= EF_ARM_VFP_FLOAT
;
1905 ehdr
.e_flags
|= EF_ARM_SOFT_FLOAT
;
1907 ehdr
.e_ident
[EI_OSABI
] = ELFOSABI_ARM
;
1912 case TCC_OUTPUT_EXE
:
1913 ehdr
.e_type
= ET_EXEC
;
1914 ehdr
.e_entry
= get_elf_sym_addr(s1
, "_start", 1);
1916 case TCC_OUTPUT_DLL
:
1917 ehdr
.e_type
= ET_DYN
;
1918 ehdr
.e_entry
= text_section
->sh_addr
; /* XXX: is it correct ? */
1920 case TCC_OUTPUT_OBJ
:
1921 ehdr
.e_type
= ET_REL
;
1924 ehdr
.e_machine
= EM_TCC_TARGET
;
1925 ehdr
.e_version
= EV_CURRENT
;
1926 ehdr
.e_shoff
= file_offset
;
1927 ehdr
.e_ehsize
= sizeof(ElfW(Ehdr
));
1928 ehdr
.e_shentsize
= sizeof(ElfW(Shdr
));
1929 ehdr
.e_shnum
= shnum
;
1930 ehdr
.e_shstrndx
= shnum
- 1;
1932 fwrite(&ehdr
, 1, sizeof(ElfW(Ehdr
)), f
);
1933 fwrite(phdr
, 1, phnum
* sizeof(ElfW(Phdr
)), f
);
1934 offset
= sizeof(ElfW(Ehdr
)) + phnum
* sizeof(ElfW(Phdr
));
1936 sort_syms(s1
, symtab_section
);
1937 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1938 s
= s1
->sections
[sec_order
[i
]];
1939 if (s
->sh_type
!= SHT_NOBITS
) {
1940 while (offset
< s
->sh_offset
) {
1946 fwrite(s
->data
, 1, size
, f
);
1951 /* output section headers */
1952 while (offset
< ehdr
.e_shoff
) {
1957 for(i
= 0; i
< s1
->nb_sections
; i
++) {
1959 memset(sh
, 0, sizeof(ElfW(Shdr
)));
1960 s
= s1
->sections
[i
];
1962 sh
->sh_name
= s
->sh_name
;
1963 sh
->sh_type
= s
->sh_type
;
1964 sh
->sh_flags
= s
->sh_flags
;
1965 sh
->sh_entsize
= s
->sh_entsize
;
1966 sh
->sh_info
= s
->sh_info
;
1968 sh
->sh_link
= s
->link
->sh_num
;
1969 sh
->sh_addralign
= s
->sh_addralign
;
1970 sh
->sh_addr
= s
->sh_addr
;
1971 sh
->sh_offset
= s
->sh_offset
;
1972 sh
->sh_size
= s
->sh_size
;
1974 fwrite(sh
, 1, sizeof(ElfW(Shdr
)), f
);
1978 /* Write an elf, coff or "binary" file */
1979 static int tcc_write_elf_file(TCCState
*s1
, const char *filename
, int phnum
,
1980 ElfW(Phdr
) *phdr
, int file_offset
, int *sec_order
)
1982 int fd
, mode
, file_type
;
1985 file_type
= s1
->output_type
;
1986 if (file_type
== TCC_OUTPUT_OBJ
)
1991 fd
= open(filename
, O_WRONLY
| O_CREAT
| O_TRUNC
| O_BINARY
, mode
);
1993 tcc_error_noabort("could not write '%s'", filename
);
1996 f
= fdopen(fd
, "wb");
1998 printf("<- %s\n", filename
);
2000 #ifdef TCC_TARGET_COFF
2001 if (s1
->output_format
== TCC_OUTPUT_FORMAT_COFF
)
2002 tcc_output_coff(s1
, f
);
2005 if (s1
->output_format
== TCC_OUTPUT_FORMAT_ELF
)
2006 tcc_output_elf(s1
, f
, phnum
, phdr
, file_offset
, sec_order
);
2008 tcc_output_binary(s1
, f
, sec_order
);
2014 /* Sort section headers by assigned sh_addr, remove sections
2015 that we aren't going to output. */
2016 static void tidy_section_headers(TCCState
*s1
, int *sec_order
)
2018 int i
, nnew
, l
, *backmap
;
2022 snew
= tcc_malloc(s1
->nb_sections
* sizeof(snew
[0]));
2023 backmap
= tcc_malloc(s1
->nb_sections
* sizeof(backmap
[0]));
2024 for (i
= 0, nnew
= 0, l
= s1
->nb_sections
; i
< s1
->nb_sections
; i
++) {
2025 s
= s1
->sections
[sec_order
[i
]];
2026 if (!i
|| s
->sh_name
) {
2027 backmap
[sec_order
[i
]] = nnew
;
2031 backmap
[sec_order
[i
]] = 0;
2035 for (i
= 0; i
< nnew
; i
++) {
2039 if (s
->sh_type
== SHT_RELX
)
2040 s
->sh_info
= backmap
[s
->sh_info
];
2044 for_each_elem(symtab_section
, 1, sym
, ElfW(Sym
))
2045 if (sym
->st_shndx
!= SHN_UNDEF
&& sym
->st_shndx
< SHN_LORESERVE
)
2046 sym
->st_shndx
= backmap
[sym
->st_shndx
];
2047 if( !s1
->static_link
) {
2048 for_each_elem(s1
->dynsym
, 1, sym
, ElfW(Sym
))
2049 if (sym
->st_shndx
!= SHN_UNDEF
&& sym
->st_shndx
< SHN_LORESERVE
)
2050 sym
->st_shndx
= backmap
[sym
->st_shndx
];
2052 for (i
= 0; i
< s1
->nb_sections
; i
++)
2054 tcc_free(s1
->sections
);
2055 s1
->sections
= snew
;
2056 s1
->nb_sections
= nnew
;
2060 /* Output an elf, coff or binary file */
2061 /* XXX: suppress unneeded sections */
2062 static int elf_output_file(TCCState
*s1
, const char *filename
)
2064 int i
, ret
, phnum
, shnum
, file_type
, file_offset
, *sec_order
;
2065 struct dyn_inf dyninf
= {0};
2068 Section
*strsec
, *interp
, *dynamic
, *dynstr
;
2071 file_type
= s1
->output_type
;
2076 interp
= dynamic
= dynstr
= NULL
; /* avoid warning */
2079 if (file_type
!= TCC_OUTPUT_OBJ
) {
2080 /* if linking, also link in runtime libraries (libc, libgcc, etc.) */
2081 tcc_add_runtime(s1
);
2082 resolve_common_syms(s1
);
2084 if (!s1
->static_link
) {
2085 if (file_type
== TCC_OUTPUT_EXE
) {
2087 /* allow override the dynamic loader */
2088 const char *elfint
= getenv("LD_SO");
2090 elfint
= DEFAULT_ELFINTERP(s1
);
2091 /* add interpreter section only if executable */
2092 interp
= new_section(s1
, ".interp", SHT_PROGBITS
, SHF_ALLOC
);
2093 interp
->sh_addralign
= 1;
2094 ptr
= section_ptr_add(interp
, 1 + strlen(elfint
));
2095 strcpy(ptr
, elfint
);
2098 /* add dynamic symbol table */
2099 s1
->dynsym
= new_symtab(s1
, ".dynsym", SHT_DYNSYM
, SHF_ALLOC
,
2101 ".hash", SHF_ALLOC
);
2102 dynstr
= s1
->dynsym
->link
;
2104 /* add dynamic section */
2105 dynamic
= new_section(s1
, ".dynamic", SHT_DYNAMIC
,
2106 SHF_ALLOC
| SHF_WRITE
);
2107 dynamic
->link
= dynstr
;
2108 dynamic
->sh_entsize
= sizeof(ElfW(Dyn
));
2112 if (file_type
== TCC_OUTPUT_EXE
) {
2113 bind_exe_dynsyms(s1
);
2116 bind_libs_dynsyms(s1
);
2118 /* shared library case: simply export all global symbols */
2119 export_global_syms(s1
);
2122 build_got_entries(s1
);
2125 /* we add a section for symbols */
2126 strsec
= new_section(s1
, ".shstrtab", SHT_STRTAB
, 0);
2127 put_elf_str(strsec
, "");
2129 /* Allocate strings for section names */
2130 textrel
= alloc_sec_names(s1
, file_type
, strsec
);
2133 /* add a list of needed dlls */
2134 for(i
= 0; i
< s1
->nb_loaded_dlls
; i
++) {
2135 DLLReference
*dllref
= s1
->loaded_dlls
[i
];
2136 if (dllref
->level
== 0)
2137 put_dt(dynamic
, DT_NEEDED
, put_elf_str(dynstr
, dllref
->name
));
2141 put_dt(dynamic
, s1
->enable_new_dtags
? DT_RUNPATH
: DT_RPATH
,
2142 put_elf_str(dynstr
, s1
->rpath
));
2144 if (file_type
== TCC_OUTPUT_DLL
) {
2146 put_dt(dynamic
, DT_SONAME
, put_elf_str(dynstr
, s1
->soname
));
2147 /* XXX: currently, since we do not handle PIC code, we
2148 must relocate the readonly segments */
2150 put_dt(dynamic
, DT_TEXTREL
, 0);
2154 put_dt(dynamic
, DT_SYMBOLIC
, 0);
2156 dyninf
.dynamic
= dynamic
;
2157 dyninf
.dynstr
= dynstr
;
2158 /* remember offset and reserve space for 2nd call below */
2159 dyninf
.data_offset
= dynamic
->data_offset
;
2160 fill_dynamic(s1
, &dyninf
);
2161 dynamic
->sh_size
= dynamic
->data_offset
;
2162 dynstr
->sh_size
= dynstr
->data_offset
;
2165 /* compute number of program headers */
2166 if (file_type
== TCC_OUTPUT_OBJ
)
2168 else if (file_type
== TCC_OUTPUT_DLL
)
2170 else if (s1
->static_link
)
2175 /* allocate program segment headers */
2176 phdr
= tcc_mallocz(phnum
* sizeof(ElfW(Phdr
)));
2178 /* compute number of sections */
2179 shnum
= s1
->nb_sections
;
2181 /* this array is used to reorder sections in the output file */
2182 sec_order
= tcc_malloc(sizeof(int) * shnum
);
2185 /* compute section to program header mapping */
2186 file_offset
= layout_sections(s1
, phdr
, phnum
, interp
, strsec
, &dyninf
,
2189 /* Fill remaining program header and finalize relocation related to dynamic
2191 if (file_type
!= TCC_OUTPUT_OBJ
) {
2192 fill_unloadable_phdr(phdr
, phnum
, interp
, dynamic
);
2194 dynamic
->data_offset
= dyninf
.data_offset
;
2195 fill_dynamic(s1
, &dyninf
);
2197 /* put in GOT the dynamic section address and relocate PLT */
2198 write32le(s1
->got
->data
, dynamic
->sh_addr
);
2199 if (file_type
== TCC_OUTPUT_EXE
2200 || (RELOCATE_DLLPLT
&& file_type
== TCC_OUTPUT_DLL
))
2203 /* relocate symbols in .dynsym now that final addresses are known */
2204 for_each_elem(s1
->dynsym
, 1, sym
, ElfW(Sym
)) {
2205 if (sym
->st_shndx
!= SHN_UNDEF
&& sym
->st_shndx
< SHN_LORESERVE
) {
2206 /* do symbol relocation */
2207 sym
->st_value
+= s1
->sections
[sym
->st_shndx
]->sh_addr
;
2212 /* if building executable or DLL, then relocate each section
2213 except the GOT which is already relocated */
2214 ret
= final_sections_reloc(s1
);
2217 tidy_section_headers(s1
, sec_order
);
2219 /* Perform relocation to GOT or PLT entries */
2220 if (file_type
== TCC_OUTPUT_EXE
&& s1
->static_link
)
2223 fill_local_got_entries(s1
);
2226 /* Create the ELF file with name 'filename' */
2227 ret
= tcc_write_elf_file(s1
, filename
, phnum
, phdr
, file_offset
, sec_order
);
2228 s1
->nb_sections
= shnum
;
2230 tcc_free(sec_order
);
2235 LIBTCCAPI
int tcc_output_file(TCCState
*s
, const char *filename
)
2238 #ifdef TCC_TARGET_PE
2239 if (s
->output_type
!= TCC_OUTPUT_OBJ
) {
2240 ret
= pe_output_file(s
, filename
);
2243 ret
= elf_output_file(s
, filename
);
2247 static void *load_data(int fd
, unsigned long file_offset
, unsigned long size
)
2251 data
= tcc_malloc(size
);
2252 lseek(fd
, file_offset
, SEEK_SET
);
2253 read(fd
, data
, size
);
2257 typedef struct SectionMergeInfo
{
2258 Section
*s
; /* corresponding existing section */
2259 unsigned long offset
; /* offset of the new section in the existing section */
2260 uint8_t new_section
; /* true if section 's' was added */
2261 uint8_t link_once
; /* true if link once section */
2264 ST_FUNC
int tcc_object_type(int fd
, ElfW(Ehdr
) *h
)
2266 int size
= read(fd
, h
, sizeof *h
);
2267 if (size
== sizeof *h
&& 0 == memcmp(h
, ELFMAG
, 4)) {
2268 if (h
->e_type
== ET_REL
)
2269 return AFF_BINTYPE_REL
;
2270 if (h
->e_type
== ET_DYN
)
2271 return AFF_BINTYPE_DYN
;
2272 } else if (size
>= 8) {
2273 if (0 == memcmp(h
, ARMAG
, 8))
2274 return AFF_BINTYPE_AR
;
2275 #ifdef TCC_TARGET_COFF
2276 if (((struct filehdr
*)h
)->f_magic
== COFF_C67_MAGIC
)
2277 return AFF_BINTYPE_C67
;
2283 /* load an object file and merge it with current files */
2284 /* XXX: handle correctly stab (debug) info */
2285 ST_FUNC
int tcc_load_object_file(TCCState
*s1
,
2286 int fd
, unsigned long file_offset
)
2289 ElfW(Shdr
) *shdr
, *sh
;
2290 int size
, i
, j
, offset
, offseti
, nb_syms
, sym_index
, ret
, seencompressed
;
2291 unsigned char *strsec
, *strtab
;
2292 int *old_to_new_syms
;
2293 char *sh_name
, *name
;
2294 SectionMergeInfo
*sm_table
, *sm
;
2295 ElfW(Sym
) *sym
, *symtab
;
2302 stab_index
= stabstr_index
= 0;
2304 lseek(fd
, file_offset
, SEEK_SET
);
2305 if (tcc_object_type(fd
, &ehdr
) != AFF_BINTYPE_REL
)
2307 /* test CPU specific stuff */
2308 if (ehdr
.e_ident
[5] != ELFDATA2LSB
||
2309 ehdr
.e_machine
!= EM_TCC_TARGET
) {
2311 tcc_error_noabort("invalid object file");
2315 shdr
= load_data(fd
, file_offset
+ ehdr
.e_shoff
,
2316 sizeof(ElfW(Shdr
)) * ehdr
.e_shnum
);
2317 sm_table
= tcc_mallocz(sizeof(SectionMergeInfo
) * ehdr
.e_shnum
);
2319 /* load section names */
2320 sh
= &shdr
[ehdr
.e_shstrndx
];
2321 strsec
= load_data(fd
, file_offset
+ sh
->sh_offset
, sh
->sh_size
);
2323 /* load symtab and strtab */
2324 old_to_new_syms
= NULL
;
2329 for(i
= 1; i
< ehdr
.e_shnum
; i
++) {
2331 if (sh
->sh_type
== SHT_SYMTAB
) {
2333 tcc_error_noabort("object must contain only one symtab");
2338 nb_syms
= sh
->sh_size
/ sizeof(ElfW(Sym
));
2339 symtab
= load_data(fd
, file_offset
+ sh
->sh_offset
, sh
->sh_size
);
2340 sm_table
[i
].s
= symtab_section
;
2342 /* now load strtab */
2343 sh
= &shdr
[sh
->sh_link
];
2344 strtab
= load_data(fd
, file_offset
+ sh
->sh_offset
, sh
->sh_size
);
2346 if (sh
->sh_flags
& SHF_COMPRESSED
)
2350 /* now examine each section and try to merge its content with the
2352 for(i
= 1; i
< ehdr
.e_shnum
; i
++) {
2353 /* no need to examine section name strtab */
2354 if (i
== ehdr
.e_shstrndx
)
2357 sh_name
= (char *) strsec
+ sh
->sh_name
;
2358 /* ignore sections types we do not handle */
2359 if (sh
->sh_type
!= SHT_PROGBITS
&&
2360 sh
->sh_type
!= SHT_RELX
&&
2362 sh
->sh_type
!= SHT_ARM_EXIDX
&&
2364 sh
->sh_type
!= SHT_NOBITS
&&
2365 sh
->sh_type
!= SHT_PREINIT_ARRAY
&&
2366 sh
->sh_type
!= SHT_INIT_ARRAY
&&
2367 sh
->sh_type
!= SHT_FINI_ARRAY
&&
2368 strcmp(sh_name
, ".stabstr")
2372 && (!strncmp(sh_name
, ".debug_", sizeof(".debug_")-1)
2373 || (sh
->sh_type
== SHT_RELX
2374 && !strncmp((char*)strsec
+ shdr
[sh
->sh_info
].sh_name
,
2375 ".debug_", sizeof(".debug_")-1))))
2377 if (sh
->sh_addralign
< 1)
2378 sh
->sh_addralign
= 1;
2379 /* find corresponding section, if any */
2380 for(j
= 1; j
< s1
->nb_sections
;j
++) {
2381 s
= s1
->sections
[j
];
2382 if (!strcmp(s
->name
, sh_name
)) {
2383 if (!strncmp(sh_name
, ".gnu.linkonce",
2384 sizeof(".gnu.linkonce") - 1)) {
2385 /* if a 'linkonce' section is already present, we
2386 do not add it again. It is a little tricky as
2387 symbols can still be defined in
2389 sm_table
[i
].link_once
= 1;
2396 /* not found: create new section */
2397 s
= new_section(s1
, sh_name
, sh
->sh_type
, sh
->sh_flags
& ~SHF_GROUP
);
2398 /* take as much info as possible from the section. sh_link and
2399 sh_info will be updated later */
2400 s
->sh_addralign
= sh
->sh_addralign
;
2401 s
->sh_entsize
= sh
->sh_entsize
;
2402 sm_table
[i
].new_section
= 1;
2404 if (sh
->sh_type
!= s
->sh_type
) {
2405 tcc_error_noabort("invalid section type");
2409 /* align start of section */
2410 offset
= s
->data_offset
;
2412 if (0 == strcmp(sh_name
, ".stab")) {
2416 if (0 == strcmp(sh_name
, ".stabstr")) {
2421 size
= sh
->sh_addralign
- 1;
2422 offset
= (offset
+ size
) & ~size
;
2423 if (sh
->sh_addralign
> s
->sh_addralign
)
2424 s
->sh_addralign
= sh
->sh_addralign
;
2425 s
->data_offset
= offset
;
2427 sm_table
[i
].offset
= offset
;
2429 /* concatenate sections */
2431 if (sh
->sh_type
!= SHT_NOBITS
) {
2433 lseek(fd
, file_offset
+ sh
->sh_offset
, SEEK_SET
);
2434 ptr
= section_ptr_add(s
, size
);
2435 read(fd
, ptr
, size
);
2437 s
->data_offset
+= size
;
2442 /* gr relocate stab strings */
2443 if (stab_index
&& stabstr_index
) {
2446 s
= sm_table
[stab_index
].s
;
2447 a
= (Stab_Sym
*)(s
->data
+ sm_table
[stab_index
].offset
);
2448 b
= (Stab_Sym
*)(s
->data
+ s
->data_offset
);
2449 o
= sm_table
[stabstr_index
].offset
;
2457 /* second short pass to update sh_link and sh_info fields of new
2459 for(i
= 1; i
< ehdr
.e_shnum
; i
++) {
2461 if (!s
|| !sm_table
[i
].new_section
)
2464 if (sh
->sh_link
> 0)
2465 s
->link
= sm_table
[sh
->sh_link
].s
;
2466 if (sh
->sh_type
== SHT_RELX
) {
2467 s
->sh_info
= sm_table
[sh
->sh_info
].s
->sh_num
;
2468 /* update backward link */
2469 s1
->sections
[s
->sh_info
]->reloc
= s
;
2474 /* resolve symbols */
2475 old_to_new_syms
= tcc_mallocz(nb_syms
* sizeof(int));
2478 for(i
= 1; i
< nb_syms
; i
++, sym
++) {
2479 if (sym
->st_shndx
!= SHN_UNDEF
&&
2480 sym
->st_shndx
< SHN_LORESERVE
) {
2481 sm
= &sm_table
[sym
->st_shndx
];
2482 if (sm
->link_once
) {
2483 /* if a symbol is in a link once section, we use the
2484 already defined symbol. It is very important to get
2485 correct relocations */
2486 if (ELFW(ST_BIND
)(sym
->st_info
) != STB_LOCAL
) {
2487 name
= (char *) strtab
+ sym
->st_name
;
2488 sym_index
= find_elf_sym(symtab_section
, name
);
2490 old_to_new_syms
[i
] = sym_index
;
2494 /* if no corresponding section added, no need to add symbol */
2497 /* convert section number */
2498 sym
->st_shndx
= sm
->s
->sh_num
;
2500 sym
->st_value
+= sm
->offset
;
2503 name
= (char *) strtab
+ sym
->st_name
;
2504 sym_index
= set_elf_sym(symtab_section
, sym
->st_value
, sym
->st_size
,
2505 sym
->st_info
, sym
->st_other
,
2506 sym
->st_shndx
, name
);
2507 old_to_new_syms
[i
] = sym_index
;
2510 /* third pass to patch relocation entries */
2511 for(i
= 1; i
< ehdr
.e_shnum
; i
++) {
2516 offset
= sm_table
[i
].offset
;
2517 switch(s
->sh_type
) {
2519 /* take relocation offset information */
2520 offseti
= sm_table
[sh
->sh_info
].offset
;
2521 for_each_elem(s
, (offset
/ sizeof(*rel
)), rel
, ElfW_Rel
) {
2524 /* convert symbol index */
2525 type
= ELFW(R_TYPE
)(rel
->r_info
);
2526 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
2527 /* NOTE: only one symtab assumed */
2528 if (sym_index
>= nb_syms
)
2530 sym_index
= old_to_new_syms
[sym_index
];
2531 /* ignore link_once in rel section. */
2532 if (!sym_index
&& !sm
->link_once
2533 #ifdef TCC_TARGET_ARM
2534 && type
!= R_ARM_V4BX
2538 tcc_error_noabort("Invalid relocation entry [%2d] '%s' @ %.8x",
2539 i
, strsec
+ sh
->sh_name
, rel
->r_offset
);
2542 rel
->r_info
= ELFW(R_INFO
)(sym_index
, type
);
2543 /* offset the relocation offset */
2544 rel
->r_offset
+= offseti
;
2545 #ifdef TCC_TARGET_ARM
2546 /* Jumps and branches from a Thumb code to a PLT entry need
2547 special handling since PLT entries are ARM code.
2548 Unconditional bl instructions referencing PLT entries are
2549 handled by converting these instructions into blx
2550 instructions. Other case of instructions referencing a PLT
2551 entry require to add a Thumb stub before the PLT entry to
2552 switch to ARM mode. We set bit plt_thumb_stub of the
2553 attribute of a symbol to indicate such a case. */
2554 if (type
== R_ARM_THM_JUMP24
)
2555 get_sym_attr(s1
, sym_index
, 1)->plt_thumb_stub
= 1;
2568 tcc_free(old_to_new_syms
);
2575 typedef struct ArchiveHeader
{
2576 char ar_name
[16]; /* name of this member */
2577 char ar_date
[12]; /* file mtime */
2578 char ar_uid
[6]; /* owner uid; printed as decimal */
2579 char ar_gid
[6]; /* owner gid; printed as decimal */
2580 char ar_mode
[8]; /* file mode, printed as octal */
2581 char ar_size
[10]; /* file size, printed as decimal */
2582 char ar_fmag
[2]; /* should contain ARFMAG */
2585 static int get_be32(const uint8_t *b
)
2587 return b
[3] | (b
[2] << 8) | (b
[1] << 16) | (b
[0] << 24);
2590 static long get_be64(const uint8_t *b
)
2592 long long ret
= get_be32(b
);
2593 ret
= (ret
<< 32) | (unsigned)get_be32(b
+4);
2597 /* load only the objects which resolve undefined symbols */
2598 static int tcc_load_alacarte(TCCState
*s1
, int fd
, int size
, int entrysize
)
2600 long i
, bound
, nsyms
, sym_index
, off
, ret
;
2602 const char *ar_names
, *p
;
2603 const uint8_t *ar_index
;
2606 data
= tcc_malloc(size
);
2607 if (read(fd
, data
, size
) != size
)
2609 nsyms
= entrysize
== 4 ? get_be32(data
) : get_be64(data
);
2610 ar_index
= data
+ entrysize
;
2611 ar_names
= (char *) ar_index
+ nsyms
* entrysize
;
2615 for(p
= ar_names
, i
= 0; i
< nsyms
; i
++, p
+= strlen(p
)+1) {
2616 sym_index
= find_elf_sym(symtab_section
, p
);
2618 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
2619 if(sym
->st_shndx
== SHN_UNDEF
) {
2620 off
= (entrysize
== 4
2621 ? get_be32(ar_index
+ i
* 4)
2622 : get_be64(ar_index
+ i
* 8))
2623 + sizeof(ArchiveHeader
);
2625 if(tcc_load_object_file(s1
, fd
, off
) < 0) {
2640 /* load a '.a' file */
2641 ST_FUNC
int tcc_load_archive(TCCState
*s1
, int fd
, int alacarte
)
2648 unsigned long file_offset
;
2650 /* skip magic which was already checked */
2651 read(fd
, magic
, sizeof(magic
));
2654 len
= read(fd
, &hdr
, sizeof(hdr
));
2657 if (len
!= sizeof(hdr
)) {
2658 tcc_error_noabort("invalid archive");
2661 memcpy(ar_size
, hdr
.ar_size
, sizeof(hdr
.ar_size
));
2662 ar_size
[sizeof(hdr
.ar_size
)] = '\0';
2663 size
= strtol(ar_size
, NULL
, 0);
2664 memcpy(ar_name
, hdr
.ar_name
, sizeof(hdr
.ar_name
));
2665 for(i
= sizeof(hdr
.ar_name
) - 1; i
>= 0; i
--) {
2666 if (ar_name
[i
] != ' ')
2669 ar_name
[i
+ 1] = '\0';
2670 file_offset
= lseek(fd
, 0, SEEK_CUR
);
2672 size
= (size
+ 1) & ~1;
2673 if (!strcmp(ar_name
, "/")) {
2674 /* coff symbol table : we handle it */
2676 return tcc_load_alacarte(s1
, fd
, size
, 4);
2677 } else if (!strcmp(ar_name
, "/SYM64/")) {
2679 return tcc_load_alacarte(s1
, fd
, size
, 8);
2682 if (tcc_object_type(fd
, &ehdr
) == AFF_BINTYPE_REL
) {
2683 if (tcc_load_object_file(s1
, fd
, file_offset
) < 0)
2687 lseek(fd
, file_offset
+ size
, SEEK_SET
);
2692 #ifndef TCC_TARGET_PE
2693 /* load a DLL and all referenced DLLs. 'level = 0' means that the DLL
2694 is referenced by the user (so it should be added as DT_NEEDED in
2695 the generated ELF file) */
2696 ST_FUNC
int tcc_load_dll(TCCState
*s1
, int fd
, const char *filename
, int level
)
2699 ElfW(Shdr
) *shdr
, *sh
, *sh1
;
2700 int i
, j
, nb_syms
, nb_dts
, sym_bind
, ret
;
2701 ElfW(Sym
) *sym
, *dynsym
;
2702 ElfW(Dyn
) *dt
, *dynamic
;
2703 unsigned char *dynstr
;
2704 const char *name
, *soname
;
2705 DLLReference
*dllref
;
2707 read(fd
, &ehdr
, sizeof(ehdr
));
2709 /* test CPU specific stuff */
2710 if (ehdr
.e_ident
[5] != ELFDATA2LSB
||
2711 ehdr
.e_machine
!= EM_TCC_TARGET
) {
2712 tcc_error_noabort("bad architecture");
2717 shdr
= load_data(fd
, ehdr
.e_shoff
, sizeof(ElfW(Shdr
)) * ehdr
.e_shnum
);
2719 /* load dynamic section and dynamic symbols */
2723 dynsym
= NULL
; /* avoid warning */
2724 dynstr
= NULL
; /* avoid warning */
2725 for(i
= 0, sh
= shdr
; i
< ehdr
.e_shnum
; i
++, sh
++) {
2726 switch(sh
->sh_type
) {
2728 nb_dts
= sh
->sh_size
/ sizeof(ElfW(Dyn
));
2729 dynamic
= load_data(fd
, sh
->sh_offset
, sh
->sh_size
);
2732 nb_syms
= sh
->sh_size
/ sizeof(ElfW(Sym
));
2733 dynsym
= load_data(fd
, sh
->sh_offset
, sh
->sh_size
);
2734 sh1
= &shdr
[sh
->sh_link
];
2735 dynstr
= load_data(fd
, sh1
->sh_offset
, sh1
->sh_size
);
2742 /* compute the real library name */
2743 soname
= tcc_basename(filename
);
2745 for(i
= 0, dt
= dynamic
; i
< nb_dts
; i
++, dt
++) {
2746 if (dt
->d_tag
== DT_SONAME
) {
2747 soname
= (char *) dynstr
+ dt
->d_un
.d_val
;
2751 /* if the dll is already loaded, do not load it */
2752 for(i
= 0; i
< s1
->nb_loaded_dlls
; i
++) {
2753 dllref
= s1
->loaded_dlls
[i
];
2754 if (!strcmp(soname
, dllref
->name
)) {
2755 /* but update level if needed */
2756 if (level
< dllref
->level
)
2757 dllref
->level
= level
;
2763 /* add the dll and its level */
2764 dllref
= tcc_mallocz(sizeof(DLLReference
) + strlen(soname
));
2765 dllref
->level
= level
;
2766 strcpy(dllref
->name
, soname
);
2767 dynarray_add(&s1
->loaded_dlls
, &s1
->nb_loaded_dlls
, dllref
);
2769 /* add dynamic symbols in dynsym_section */
2770 for(i
= 1, sym
= dynsym
+ 1; i
< nb_syms
; i
++, sym
++) {
2771 sym_bind
= ELFW(ST_BIND
)(sym
->st_info
);
2772 if (sym_bind
== STB_LOCAL
)
2774 name
= (char *) dynstr
+ sym
->st_name
;
2775 set_elf_sym(s1
->dynsymtab_section
, sym
->st_value
, sym
->st_size
,
2776 sym
->st_info
, sym
->st_other
, sym
->st_shndx
, name
);
2779 /* load all referenced DLLs */
2780 for(i
= 0, dt
= dynamic
; i
< nb_dts
; i
++, dt
++) {
2783 name
= (char *) dynstr
+ dt
->d_un
.d_val
;
2784 for(j
= 0; j
< s1
->nb_loaded_dlls
; j
++) {
2785 dllref
= s1
->loaded_dlls
[j
];
2786 if (!strcmp(name
, dllref
->name
))
2787 goto already_loaded
;
2789 if (tcc_add_dll(s1
, name
, AFF_REFERENCED_DLL
) < 0) {
2790 tcc_error_noabort("referenced dll '%s' not found", name
);
2807 #define LD_TOK_NAME 256
2808 #define LD_TOK_EOF (-1)
2810 /* return next ld script token */
2811 static int ld_next(TCCState
*s1
, char *name
, int name_size
)
2829 file
->buf_ptr
= parse_comment(file
->buf_ptr
);
2830 ch
= file
->buf_ptr
[0];
2843 /* case 'a' ... 'z': */
2870 /* case 'A' ... 'z': */
2904 if (!((ch
>= 'a' && ch
<= 'z') ||
2905 (ch
>= 'A' && ch
<= 'Z') ||
2906 (ch
>= '0' && ch
<= '9') ||
2907 strchr("/.-_+=$:\\,~", ch
)))
2909 if ((q
- name
) < name_size
- 1) {
2928 static int ld_add_file(TCCState
*s1
, const char filename
[])
2930 if (filename
[0] == '/') {
2931 if (CONFIG_SYSROOT
[0] == '\0'
2932 && tcc_add_file_internal(s1
, filename
, AFF_TYPE_BIN
) == 0)
2934 filename
= tcc_basename(filename
);
2936 return tcc_add_dll(s1
, filename
, 0);
2939 static inline int new_undef_syms(void)
2942 ret
= new_undef_sym
;
2947 static int ld_add_file_list(TCCState
*s1
, const char *cmd
, int as_needed
)
2949 char filename
[1024], libname
[1024];
2950 int t
, group
, nblibs
= 0, ret
= 0;
2953 group
= !strcmp(cmd
, "GROUP");
2956 t
= ld_next(s1
, filename
, sizeof(filename
));
2959 t
= ld_next(s1
, filename
, sizeof(filename
));
2962 if (t
== LD_TOK_EOF
) {
2963 tcc_error_noabort("unexpected end of file");
2965 goto lib_parse_error
;
2966 } else if (t
== ')') {
2968 } else if (t
== '-') {
2969 t
= ld_next(s1
, filename
, sizeof(filename
));
2970 if ((t
!= LD_TOK_NAME
) || (filename
[0] != 'l')) {
2971 tcc_error_noabort("library name expected");
2973 goto lib_parse_error
;
2975 pstrcpy(libname
, sizeof libname
, &filename
[1]);
2976 if (s1
->static_link
) {
2977 snprintf(filename
, sizeof filename
, "lib%s.a", libname
);
2979 snprintf(filename
, sizeof filename
, "lib%s.so", libname
);
2981 } else if (t
!= LD_TOK_NAME
) {
2982 tcc_error_noabort("filename expected");
2984 goto lib_parse_error
;
2986 if (!strcmp(filename
, "AS_NEEDED")) {
2987 ret
= ld_add_file_list(s1
, cmd
, 1);
2989 goto lib_parse_error
;
2991 /* TODO: Implement AS_NEEDED support. Ignore it for now */
2993 ret
= ld_add_file(s1
, filename
);
2995 goto lib_parse_error
;
2997 /* Add the filename *and* the libname to avoid future conversions */
2998 dynarray_add(&libs
, &nblibs
, tcc_strdup(filename
));
2999 if (libname
[0] != '\0')
3000 dynarray_add(&libs
, &nblibs
, tcc_strdup(libname
));
3004 t
= ld_next(s1
, filename
, sizeof(filename
));
3006 t
= ld_next(s1
, filename
, sizeof(filename
));
3009 if (group
&& !as_needed
) {
3010 while (new_undef_syms()) {
3013 for (i
= 0; i
< nblibs
; i
++)
3014 ld_add_file(s1
, libs
[i
]);
3018 dynarray_reset(&libs
, &nblibs
);
3022 /* interpret a subset of GNU ldscripts to handle the dummy libc.so
3024 ST_FUNC
int tcc_load_ldscript(TCCState
*s1
)
3027 char filename
[1024];
3032 t
= ld_next(s1
, cmd
, sizeof(cmd
));
3033 if (t
== LD_TOK_EOF
)
3035 else if (t
!= LD_TOK_NAME
)
3037 if (!strcmp(cmd
, "INPUT") ||
3038 !strcmp(cmd
, "GROUP")) {
3039 ret
= ld_add_file_list(s1
, cmd
, 0);
3042 } else if (!strcmp(cmd
, "OUTPUT_FORMAT") ||
3043 !strcmp(cmd
, "TARGET")) {
3044 /* ignore some commands */
3045 t
= ld_next(s1
, cmd
, sizeof(cmd
));
3049 t
= ld_next(s1
, filename
, sizeof(filename
));
3050 if (t
== LD_TOK_EOF
) {
3051 tcc_error_noabort("unexpected end of file");
3053 } else if (t
== ')') {
3063 #endif /* !TCC_TARGET_PE */