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 static int new_undef_sym
= 0; /* Is there a new undefined sym since last new_undef_sym() */
25 ST_FUNC
int put_elf_str(Section
*s
, const char *sym
)
30 len
= strlen(sym
) + 1;
31 offset
= s
->data_offset
;
32 ptr
= section_ptr_add(s
, len
);
33 memcpy(ptr
, sym
, len
);
37 /* elf symbol hashing function */
38 static unsigned long elf_hash(const unsigned char *name
)
40 unsigned long h
= 0, g
;
43 h
= (h
<< 4) + *name
++;
52 /* rebuild hash table of section s */
53 /* NOTE: we do factorize the hash table code to go faster */
54 static void rebuild_hash(Section
*s
, unsigned int nb_buckets
)
57 int *ptr
, *hash
, nb_syms
, sym_index
, h
;
60 strtab
= s
->link
->data
;
61 nb_syms
= s
->data_offset
/ sizeof(ElfW(Sym
));
63 s
->hash
->data_offset
= 0;
64 ptr
= section_ptr_add(s
->hash
, (2 + nb_buckets
+ nb_syms
) * sizeof(int));
69 memset(hash
, 0, (nb_buckets
+ 1) * sizeof(int));
70 ptr
+= nb_buckets
+ 1;
72 sym
= (ElfW(Sym
) *)s
->data
+ 1;
73 for(sym_index
= 1; sym_index
< nb_syms
; sym_index
++) {
74 if (ELFW(ST_BIND
)(sym
->st_info
) != STB_LOCAL
) {
75 h
= elf_hash(strtab
+ sym
->st_name
) % nb_buckets
;
86 /* return the symbol number */
87 ST_FUNC
int put_elf_sym(Section
*s
, addr_t value
, unsigned long size
,
88 int info
, int other
, int shndx
, const char *name
)
90 int name_offset
, sym_index
;
95 sym
= section_ptr_add(s
, sizeof(ElfW(Sym
)));
97 name_offset
= put_elf_str(s
->link
, name
);
100 /* XXX: endianness */
101 sym
->st_name
= name_offset
;
102 sym
->st_value
= value
;
105 sym
->st_other
= other
;
106 sym
->st_shndx
= shndx
;
107 sym_index
= sym
- (ElfW(Sym
) *)s
->data
;
111 ptr
= section_ptr_add(hs
, sizeof(int));
112 base
= (int *)hs
->data
;
113 /* only add global or weak symbols */
114 if (ELFW(ST_BIND
)(info
) != STB_LOCAL
) {
115 /* add another hashing entry */
117 h
= elf_hash(name
) % nbuckets
;
119 base
[2 + h
] = sym_index
;
121 /* we resize the hash table */
122 hs
->nb_hashed_syms
++;
123 if (hs
->nb_hashed_syms
> 2 * nbuckets
) {
124 rebuild_hash(s
, 2 * nbuckets
);
134 /* find global ELF symbol 'name' and return its index. Return 0 if not
136 ST_FUNC
int find_elf_sym(Section
*s
, const char *name
)
140 int nbuckets
, sym_index
, h
;
146 nbuckets
= ((int *)hs
->data
)[0];
147 h
= elf_hash(name
) % nbuckets
;
148 sym_index
= ((int *)hs
->data
)[2 + h
];
149 while (sym_index
!= 0) {
150 sym
= &((ElfW(Sym
) *)s
->data
)[sym_index
];
151 name1
= s
->link
->data
+ sym
->st_name
;
152 if (!strcmp(name
, name1
))
154 sym_index
= ((int *)hs
->data
)[2 + nbuckets
+ sym_index
];
159 /* return elf symbol value, signal error if 'err' is nonzero */
160 ST_FUNC addr_t
get_elf_sym_addr(TCCState
*s
, const char *name
, int err
)
165 sym_index
= find_elf_sym(s
->symtab
, name
);
166 sym
= &((ElfW(Sym
) *)s
->symtab
->data
)[sym_index
];
167 if (!sym_index
|| sym
->st_shndx
== SHN_UNDEF
) {
169 tcc_error("%s not defined", name
);
172 return sym
->st_value
;
175 /* return elf symbol value */
176 LIBTCCAPI
void *tcc_get_symbol(TCCState
*s
, const char *name
)
178 return (void*)(uintptr_t)get_elf_sym_addr(s
, name
, 0);
181 #if defined TCC_IS_NATIVE || defined TCC_TARGET_PE
182 /* return elf symbol value or error */
183 ST_FUNC
void* tcc_get_symbol_err(TCCState
*s
, const char *name
)
185 return (void*)(uintptr_t)get_elf_sym_addr(s
, name
, 1);
189 /* add an elf symbol : check if it is already defined and patch
190 it. Return symbol index. NOTE that sh_num can be SHN_UNDEF. */
191 ST_FUNC
int add_elf_sym(Section
*s
, addr_t value
, unsigned long size
,
192 int info
, int other
, int sh_num
, const char *name
)
195 int sym_bind
, sym_index
, sym_type
, esym_bind
;
196 unsigned char sym_vis
, esym_vis
, new_vis
;
198 sym_bind
= ELFW(ST_BIND
)(info
);
199 sym_type
= ELFW(ST_TYPE
)(info
);
200 sym_vis
= ELFW(ST_VISIBILITY
)(other
);
202 if (sym_bind
!= STB_LOCAL
) {
203 /* we search global or weak symbols */
204 sym_index
= find_elf_sym(s
, name
);
207 esym
= &((ElfW(Sym
) *)s
->data
)[sym_index
];
208 if (esym
->st_shndx
!= SHN_UNDEF
) {
209 esym_bind
= ELFW(ST_BIND
)(esym
->st_info
);
210 /* propagate the most constraining visibility */
211 /* STV_DEFAULT(0)<STV_PROTECTED(3)<STV_HIDDEN(2)<STV_INTERNAL(1) */
212 esym_vis
= ELFW(ST_VISIBILITY
)(esym
->st_other
);
213 if (esym_vis
== STV_DEFAULT
) {
215 } else if (sym_vis
== STV_DEFAULT
) {
218 new_vis
= (esym_vis
< sym_vis
) ? esym_vis
: sym_vis
;
220 esym
->st_other
= (esym
->st_other
& ~ELFW(ST_VISIBILITY
)(-1))
222 other
= esym
->st_other
; /* in case we have to patch esym */
223 if (sh_num
== SHN_UNDEF
) {
224 /* ignore adding of undefined symbol if the
225 corresponding symbol is already defined */
226 } else if (sym_bind
== STB_GLOBAL
&& esym_bind
== STB_WEAK
) {
227 /* global overrides weak, so patch */
229 } else if (sym_bind
== STB_WEAK
&& esym_bind
== STB_GLOBAL
) {
230 /* weak is ignored if already global */
231 } else if (sym_bind
== STB_WEAK
&& esym_bind
== STB_WEAK
) {
232 /* keep first-found weak definition, ignore subsequents */
233 } else if (sym_vis
== STV_HIDDEN
|| sym_vis
== STV_INTERNAL
) {
234 /* ignore hidden symbols after */
235 } else if (esym
->st_shndx
== SHN_COMMON
236 && (sh_num
< SHN_LORESERVE
|| sh_num
== SHN_COMMON
)) {
237 /* gr: Happens with 'tcc ... -static tcctest.c' on e.g. Ubuntu 6.01
238 No idea if this is the correct solution ... */
240 } else if (s
== tcc_state
->dynsymtab_section
) {
241 /* we accept that two DLL define the same symbol */
244 printf("new_bind=%x new_shndx=%x new_vis=%x old_bind=%x old_shndx=%x old_vis=%x\n",
245 sym_bind
, sh_num
, new_vis
, esym_bind
, esym
->st_shndx
, esym_vis
);
247 tcc_error_noabort("'%s' defined twice", name
);
251 esym
->st_info
= ELFW(ST_INFO
)(sym_bind
, sym_type
);
252 esym
->st_shndx
= sh_num
;
254 esym
->st_value
= value
;
255 esym
->st_size
= size
;
256 esym
->st_other
= other
;
260 sym_index
= put_elf_sym(s
, value
, size
,
261 ELFW(ST_INFO
)(sym_bind
, sym_type
), other
,
268 ST_FUNC
void put_elf_reloc(Section
*symtab
, Section
*s
, unsigned long offset
,
269 int type
, int symbol
)
277 /* if no relocation section, create it */
278 snprintf(buf
, sizeof(buf
), REL_SECTION_FMT
, s
->name
);
279 /* if the symtab is allocated, then we consider the relocation
281 sr
= new_section(tcc_state
, buf
, SHT_RELX
, symtab
->sh_flags
);
282 sr
->sh_entsize
= sizeof(ElfW_Rel
);
284 sr
->sh_info
= s
->sh_num
;
287 rel
= section_ptr_add(sr
, sizeof(ElfW_Rel
));
288 rel
->r_offset
= offset
;
289 rel
->r_info
= ELFW(R_INFO
)(symbol
, type
);
290 #ifdef TCC_TARGET_X86_64
295 /* put stab debug information */
297 ST_FUNC
void put_stabs(const char *str
, int type
, int other
, int desc
,
302 sym
= section_ptr_add(stab_section
, sizeof(Stab_Sym
));
304 sym
->n_strx
= put_elf_str(stabstr_section
, str
);
309 sym
->n_other
= other
;
311 sym
->n_value
= value
;
314 ST_FUNC
void put_stabs_r(const char *str
, int type
, int other
, int desc
,
315 unsigned long value
, Section
*sec
, int sym_index
)
317 put_stabs(str
, type
, other
, desc
, value
);
318 put_elf_reloc(symtab_section
, stab_section
,
319 stab_section
->data_offset
- sizeof(unsigned int),
320 R_DATA_32
, sym_index
);
323 ST_FUNC
void put_stabn(int type
, int other
, int desc
, int value
)
325 put_stabs(NULL
, type
, other
, desc
, value
);
328 ST_FUNC
void put_stabd(int type
, int other
, int desc
)
330 put_stabs(NULL
, type
, other
, desc
, 0);
333 /* In an ELF file symbol table, the local symbols must appear below
334 the global and weak ones. Since TCC cannot sort it while generating
335 the code, we must do it after. All the relocation tables are also
336 modified to take into account the symbol table sorting */
337 static void sort_syms(TCCState
*s1
, Section
*s
)
339 int *old_to_new_syms
;
343 ElfW_Rel
*rel
, *rel_end
;
347 nb_syms
= s
->data_offset
/ sizeof(ElfW(Sym
));
348 new_syms
= tcc_malloc(nb_syms
* sizeof(ElfW(Sym
)));
349 old_to_new_syms
= tcc_malloc(nb_syms
* sizeof(int));
351 /* first pass for local symbols */
352 p
= (ElfW(Sym
) *)s
->data
;
354 for(i
= 0; i
< nb_syms
; i
++) {
355 if (ELFW(ST_BIND
)(p
->st_info
) == STB_LOCAL
) {
356 old_to_new_syms
[i
] = q
- new_syms
;
361 /* save the number of local symbols in section header */
362 s
->sh_info
= q
- new_syms
;
364 /* then second pass for non local symbols */
365 p
= (ElfW(Sym
) *)s
->data
;
366 for(i
= 0; i
< nb_syms
; i
++) {
367 if (ELFW(ST_BIND
)(p
->st_info
) != STB_LOCAL
) {
368 old_to_new_syms
[i
] = q
- new_syms
;
374 /* we copy the new symbols to the old */
375 memcpy(s
->data
, new_syms
, nb_syms
* sizeof(ElfW(Sym
)));
378 /* now we modify all the relocations */
379 for(i
= 1; i
< s1
->nb_sections
; i
++) {
380 sr
= s1
->sections
[i
];
381 if (sr
->sh_type
== SHT_RELX
&& sr
->link
== s
) {
382 rel_end
= (ElfW_Rel
*)(sr
->data
+ sr
->data_offset
);
383 for(rel
= (ElfW_Rel
*)sr
->data
;
386 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
387 type
= ELFW(R_TYPE
)(rel
->r_info
);
388 sym_index
= old_to_new_syms
[sym_index
];
389 rel
->r_info
= ELFW(R_INFO
)(sym_index
, type
);
394 tcc_free(old_to_new_syms
);
397 /* relocate common symbols in the .bss section */
398 ST_FUNC
void relocate_common_syms(void)
400 ElfW(Sym
) *sym
, *sym_end
;
401 unsigned long offset
, align
;
403 sym_end
= (ElfW(Sym
) *)(symtab_section
->data
+ symtab_section
->data_offset
);
404 for(sym
= (ElfW(Sym
) *)symtab_section
->data
+ 1;
407 if (sym
->st_shndx
== SHN_COMMON
) {
409 align
= sym
->st_value
;
410 offset
= bss_section
->data_offset
;
411 offset
= (offset
+ align
- 1) & -align
;
412 sym
->st_value
= offset
;
413 sym
->st_shndx
= bss_section
->sh_num
;
414 offset
+= sym
->st_size
;
415 bss_section
->data_offset
= offset
;
420 /* relocate symbol table, resolve undefined symbols if do_resolve is
421 true and output error if undefined symbol. */
422 ST_FUNC
void relocate_syms(TCCState
*s1
, int do_resolve
)
424 ElfW(Sym
) *sym
, *esym
, *sym_end
;
425 int sym_bind
, sh_num
, sym_index
;
428 sym_end
= (ElfW(Sym
) *)(symtab_section
->data
+ symtab_section
->data_offset
);
429 for(sym
= (ElfW(Sym
) *)symtab_section
->data
+ 1;
432 sh_num
= sym
->st_shndx
;
433 if (sh_num
== SHN_UNDEF
) {
434 name
= strtab_section
->data
+ sym
->st_name
;
436 #if defined TCC_IS_NATIVE && !defined _WIN32
438 name
= symtab_section
->link
->data
+ sym
->st_name
;
439 addr
= resolve_sym(s1
, name
);
441 sym
->st_value
= (addr_t
)addr
;
445 } else if (s1
->dynsym
) {
446 /* if dynamic symbol exist, then use it */
447 sym_index
= find_elf_sym(s1
->dynsym
, name
);
449 esym
= &((ElfW(Sym
) *)s1
->dynsym
->data
)[sym_index
];
450 sym
->st_value
= esym
->st_value
;
454 /* XXX: _fp_hw seems to be part of the ABI, so we ignore
456 if (!strcmp(name
, "_fp_hw"))
458 /* only weak symbols are accepted to be undefined. Their
460 sym_bind
= ELFW(ST_BIND
)(sym
->st_info
);
461 if (sym_bind
== STB_WEAK
) {
464 tcc_error_noabort("undefined symbol '%s'", name
);
466 } else if (sh_num
< SHN_LORESERVE
) {
467 /* add section base */
468 sym
->st_value
+= s1
->sections
[sym
->st_shndx
]->sh_addr
;
474 #ifdef TCC_HAS_RUNTIME_PLTGOT
475 #ifdef TCC_TARGET_X86_64
476 #define JMP_TABLE_ENTRY_SIZE 14
477 static addr_t
add_jmp_table(TCCState
*s1
, addr_t val
)
479 char *p
= s1
->runtime_plt_and_got
+ s1
->runtime_plt_and_got_offset
;
480 s1
->runtime_plt_and_got_offset
+= JMP_TABLE_ENTRY_SIZE
;
485 *(addr_t
*)(p
+ 6) = val
;
489 static addr_t
add_got_table(TCCState
*s1
, addr_t val
)
491 addr_t
*p
= (addr_t
*)(s1
->runtime_plt_and_got
+ s1
->runtime_plt_and_got_offset
);
492 s1
->runtime_plt_and_got_offset
+= sizeof(addr_t
);
496 #elif defined TCC_TARGET_ARM
497 #define JMP_TABLE_ENTRY_SIZE 8
498 static addr_t
add_jmp_table(TCCState
*s1
, int val
)
500 uint32_t *p
= (uint32_t *)(s1
->runtime_plt_and_got
+ s1
->runtime_plt_and_got_offset
);
501 s1
->runtime_plt_and_got_offset
+= JMP_TABLE_ENTRY_SIZE
;
502 /* ldr pc, [pc, #-4] */
508 #endif /* def TCC_HAS_RUNTIME_PLTGOT */
510 /* relocate a given section (CPU dependent) */
511 ST_FUNC
void relocate_section(TCCState
*s1
, Section
*s
)
514 ElfW_Rel
*rel
, *rel_end
, *qrel
;
519 #if defined TCC_TARGET_I386 || defined TCC_TARGET_X86_64
524 rel_end
= (ElfW_Rel
*)(sr
->data
+ sr
->data_offset
);
525 qrel
= (ElfW_Rel
*)sr
->data
;
529 ptr
= s
->data
+ rel
->r_offset
;
531 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
532 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
534 #ifdef TCC_TARGET_X86_64
535 val
+= rel
->r_addend
;
537 type
= ELFW(R_TYPE
)(rel
->r_info
);
538 addr
= s
->sh_addr
+ rel
->r_offset
;
542 #if defined(TCC_TARGET_I386)
544 if (s1
->output_type
== TCC_OUTPUT_DLL
) {
545 esym_index
= s1
->symtab_to_dynsym
[sym_index
];
546 qrel
->r_offset
= rel
->r_offset
;
548 qrel
->r_info
= ELFW(R_INFO
)(esym_index
, R_386_32
);
552 qrel
->r_info
= ELFW(R_INFO
)(0, R_386_RELATIVE
);
559 if (s1
->output_type
== TCC_OUTPUT_DLL
) {
561 esym_index
= s1
->symtab_to_dynsym
[sym_index
];
563 qrel
->r_offset
= rel
->r_offset
;
564 qrel
->r_info
= ELFW(R_INFO
)(esym_index
, R_386_PC32
);
569 *(int *)ptr
+= val
- addr
;
572 *(int *)ptr
+= val
- addr
;
579 *(int *)ptr
+= s1
->got
->sh_addr
- addr
;
582 *(int *)ptr
+= val
- s1
->got
->sh_addr
;
585 /* we load the got offset */
586 *(int *)ptr
+= s1
->sym_attrs
[sym_index
].got_offset
;
589 if (s1
->output_format
!= TCC_OUTPUT_FORMAT_BINARY
) {
591 tcc_error("can only produce 16-bit binary files");
593 *(short *)ptr
+= val
;
596 if (s1
->output_format
!= TCC_OUTPUT_FORMAT_BINARY
)
598 *(short *)ptr
+= val
- addr
;
600 #elif defined(TCC_TARGET_ARM)
606 int x
, is_thumb
, is_call
, h
, blx_avail
, is_bl
, th_ko
;
607 x
= (*(int *) ptr
) & 0xffffff;
608 (*(int *)ptr
) &= 0xff000000;
612 blx_avail
= (TCC_ARM_VERSION
>= 5);
614 is_bl
= (*(unsigned *) ptr
) >> 24 == 0xeb;
615 is_call
= (type
== R_ARM_CALL
|| (type
== R_ARM_PC24
&& is_bl
));
618 th_ko
= (x
& 3) && (!blx_avail
|| !is_call
);
619 #ifdef TCC_HAS_RUNTIME_PLTGOT
620 if (s1
->output_type
== TCC_OUTPUT_MEMORY
) {
621 if (th_ko
|| x
>= 0x2000000 || x
< -0x2000000) {
622 x
+= add_jmp_table(s1
, val
) - val
; /* add veneer */
623 th_ko
= (x
& 3) && (!blx_avail
|| !is_call
);
624 is_thumb
= 0; /* Veneer uses ARM instructions */
628 if (th_ko
|| x
>= 0x2000000 || x
< -0x2000000)
629 tcc_error("can't relocate value at %x",addr
);
632 /* Only reached if blx is avail and it is a call */
635 (*(int *)ptr
) = 0xfa << 24; /* bl -> blx */
640 /* Since these relocations only concern Thumb-2 and blx instruction was
641 introduced before Thumb-2, we can assume blx is available and not
644 case R_ARM_THM_JUMP24
:
646 int x
, hi
, lo
, s
, j1
, j2
, i1
, i2
, imm10
, imm11
;
647 int to_thumb
, is_call
, to_plt
, blx_bit
= 1 << 12;
651 if (sym
->st_shndx
== SHN_UNDEF
&&
652 ELFW(ST_BIND
)(sym
->st_info
) == STB_WEAK
)
655 /* Get initial offset */
656 hi
= (*(uint16_t *)ptr
);
657 lo
= (*(uint16_t *)(ptr
+2));
665 x
= (s
<< 24) | (i1
<< 23) | (i2
<< 22) |
666 (imm10
<< 12) | (imm11
<< 1);
670 /* Relocation infos */
673 to_plt
= (val
>= plt
->sh_addr
) &&
674 (val
< plt
->sh_addr
+ plt
->data_offset
);
675 is_call
= (type
== R_ARM_THM_PC22
);
677 /* Compute final offset */
678 if (to_plt
&& !is_call
) /* Point to 1st instr of Thumb stub */
681 if (!to_thumb
&& is_call
) {
682 blx_bit
= 0; /* bl -> blx */
683 x
= (x
+ 3) & -4; /* Compute offset from aligned PC */
686 /* Check that relocation is possible
687 * offset must not be out of range
688 * if target is to be entered in arm mode:
690 - instruction must be a call (bl) or a jump to PLT */
691 if (!to_thumb
|| x
>= 0x1000000 || x
< -0x1000000)
692 if (to_thumb
|| (val
& 2) || (!is_call
&& !to_plt
))
693 tcc_error("can't relocate value at %x",addr
);
695 /* Compute and store final offset */
701 imm10
= (x
>> 12) & 0x3ff;
702 imm11
= (x
>> 1) & 0x7ff;
703 (*(uint16_t *)ptr
) = (uint16_t) ((hi
& 0xf800) |
705 (*(uint16_t *)(ptr
+2)) = (uint16_t) ((lo
& 0xc000) |
706 (j1
<< 13) | blx_bit
| (j2
<< 11) |
711 case R_ARM_MOVW_ABS_NC
:
714 if (type
== R_ARM_MOVT_ABS
)
717 imm4
= (val
>> 12) & 0xf;
718 x
= (imm4
<< 16) | imm12
;
719 if (type
== R_ARM_THM_MOVT_ABS
)
725 case R_ARM_THM_MOVT_ABS
:
726 case R_ARM_THM_MOVW_ABS_NC
:
728 int x
, i
, imm4
, imm3
, imm8
;
729 if (type
== R_ARM_THM_MOVT_ABS
)
732 imm3
= (val
>> 8) & 0x7;
734 imm4
= (val
>> 12) & 0xf;
735 x
= (imm3
<< 28) | (imm8
<< 16) | (i
<< 10) | imm4
;
736 if (type
== R_ARM_THM_MOVT_ABS
)
745 x
= (*(int *)ptr
) & 0x7fffffff;
746 (*(int *)ptr
) &= 0x80000000;
749 if((x
^(x
>>1))&0x40000000)
750 tcc_error("can't relocate value at %x",addr
);
751 (*(int *)ptr
) |= x
& 0x7fffffff;
757 *(int *)ptr
+= val
- addr
;
760 *(int *)ptr
+= s1
->got
->sh_addr
- addr
;
763 *(int *)ptr
+= val
- s1
->got
->sh_addr
;
766 /* we load the got offset */
767 *(int *)ptr
+= s1
->sym_attrs
[sym_index
].got_offset
;
772 /* trade Thumb support for ARMv4 support */
773 if ((0x0ffffff0 & *(int*)ptr
) == 0x012FFF10)
774 *(int*)ptr
^= 0xE12FFF10 ^ 0xE1A0F000; /* BX Rm -> MOV PC, Rm */
777 fprintf(stderr
,"FIXME: handle reloc type %x at %x [%p] to %x\n",
778 type
, (unsigned)addr
, ptr
, (unsigned)val
);
780 #elif defined(TCC_TARGET_C67)
788 /* put the low 16 bits of the absolute address
789 add to what is already there */
791 orig
= ((*(int *)(ptr
)) >> 7) & 0xffff;
792 orig
|= (((*(int *)(ptr
+4)) >> 7) & 0xffff) << 16;
794 /* patch both at once - assumes always in pairs Low - High */
796 *(int *) ptr
= (*(int *) ptr
& (~(0xffff << 7)) ) | (((val
+orig
) & 0xffff) << 7);
797 *(int *)(ptr
+4) = (*(int *)(ptr
+4) & (~(0xffff << 7)) ) | ((((val
+orig
)>>16) & 0xffff) << 7);
803 fprintf(stderr
,"FIXME: handle reloc type %x at %x [%p] to %x\n",
804 type
, (unsigned)addr
, ptr
, (unsigned)val
);
806 #elif defined(TCC_TARGET_X86_64)
808 if (s1
->output_type
== TCC_OUTPUT_DLL
) {
809 qrel
->r_info
= ELFW(R_INFO
)(0, R_X86_64_RELATIVE
);
810 qrel
->r_addend
= *(long long *)ptr
+ val
;
813 *(long long *)ptr
+= val
;
817 if (s1
->output_type
== TCC_OUTPUT_DLL
) {
818 /* XXX: this logic may depend on TCC's codegen
819 now TCC uses R_X86_64_32 even for a 64bit pointer */
820 qrel
->r_info
= ELFW(R_INFO
)(0, R_X86_64_RELATIVE
);
821 qrel
->r_addend
= *(int *)ptr
+ val
;
828 if (s1
->output_type
== TCC_OUTPUT_DLL
) {
830 esym_index
= s1
->symtab_to_dynsym
[sym_index
];
832 qrel
->r_offset
= rel
->r_offset
;
833 qrel
->r_info
= ELFW(R_INFO
)(esym_index
, R_X86_64_PC32
);
834 qrel
->r_addend
= *(int *)ptr
;
840 case R_X86_64_PLT32
: {
842 diff
= (long long)val
- addr
;
843 if (diff
<= -2147483647 || diff
> 2147483647) {
844 #ifdef TCC_HAS_RUNTIME_PLTGOT
845 /* XXX: naive support for over 32bit jump */
846 if (s1
->output_type
== TCC_OUTPUT_MEMORY
) {
847 val
= (add_jmp_table(s1
, val
- rel
->r_addend
) +
852 if (diff
<= -2147483647 || diff
> 2147483647) {
853 tcc_error("internal error: relocation failed");
859 case R_X86_64_GLOB_DAT
:
860 case R_X86_64_JUMP_SLOT
:
861 /* They don't need addend */
862 *(int *)ptr
= val
- rel
->r_addend
;
864 case R_X86_64_GOTPCREL
:
865 #ifdef TCC_HAS_RUNTIME_PLTGOT
866 if (s1
->output_type
== TCC_OUTPUT_MEMORY
) {
867 val
= add_got_table(s1
, val
- rel
->r_addend
) + rel
->r_addend
;
868 *(int *)ptr
+= val
- addr
;
872 *(int *)ptr
+= (s1
->got
->sh_addr
- addr
+
873 s1
->sym_attrs
[sym_index
].got_offset
- 4);
875 case R_X86_64_GOTTPOFF
:
876 *(int *)ptr
+= val
- s1
->got
->sh_addr
;
879 /* we load the got offset */
880 *(int *)ptr
+= s1
->sym_attrs
[sym_index
].got_offset
;
883 #error unsupported processor
887 /* if the relocation is allocated, we change its symbol table */
888 if (sr
->sh_flags
& SHF_ALLOC
)
889 sr
->link
= s1
->dynsym
;
892 /* relocate relocation table in 'sr' */
893 static void relocate_rel(TCCState
*s1
, Section
*sr
)
896 ElfW_Rel
*rel
, *rel_end
;
898 s
= s1
->sections
[sr
->sh_info
];
899 rel_end
= (ElfW_Rel
*)(sr
->data
+ sr
->data_offset
);
900 for(rel
= (ElfW_Rel
*)sr
->data
;
903 rel
->r_offset
+= s
->sh_addr
;
907 /* count the number of dynamic relocations so that we can reserve
909 static int prepare_dynamic_rel(TCCState
*s1
, Section
*sr
)
911 ElfW_Rel
*rel
, *rel_end
;
912 int sym_index
, esym_index
, type
, count
;
915 rel_end
= (ElfW_Rel
*)(sr
->data
+ sr
->data_offset
);
916 for(rel
= (ElfW_Rel
*)sr
->data
; rel
< rel_end
; rel
++) {
917 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
918 type
= ELFW(R_TYPE
)(rel
->r_info
);
920 #if defined(TCC_TARGET_I386)
922 #elif defined(TCC_TARGET_X86_64)
929 #if defined(TCC_TARGET_I386)
931 #elif defined(TCC_TARGET_X86_64)
934 esym_index
= s1
->symtab_to_dynsym
[sym_index
];
943 /* allocate the section */
944 sr
->sh_flags
|= SHF_ALLOC
;
945 sr
->sh_size
= count
* sizeof(ElfW_Rel
);
950 static struct sym_attr
*alloc_sym_attr(TCCState
*s1
, int index
)
953 struct sym_attr
*tab
;
955 if (index
>= s1
->nb_sym_attrs
) {
956 /* find immediately bigger power of 2 and reallocate array */
960 tab
= tcc_realloc(s1
->sym_attrs
, n
* sizeof(*s1
->sym_attrs
));
962 memset(s1
->sym_attrs
+ s1
->nb_sym_attrs
, 0,
963 (n
- s1
->nb_sym_attrs
) * sizeof(*s1
->sym_attrs
));
964 s1
->nb_sym_attrs
= n
;
966 return &s1
->sym_attrs
[index
];
969 /* XXX: suppress that */
970 static void put32(unsigned char *p
, uint32_t val
)
978 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_ARM) || \
979 defined(TCC_TARGET_X86_64)
980 static uint32_t get32(unsigned char *p
)
982 return p
[0] | (p
[1] << 8) | (p
[2] << 16) | (p
[3] << 24);
986 static void build_got(TCCState
*s1
)
990 /* if no got, then create it */
991 s1
->got
= new_section(s1
, ".got", SHT_PROGBITS
, SHF_ALLOC
| SHF_WRITE
);
992 s1
->got
->sh_entsize
= 4;
993 add_elf_sym(symtab_section
, 0, 4, ELFW(ST_INFO
)(STB_GLOBAL
, STT_OBJECT
),
994 0, s1
->got
->sh_num
, "_GLOBAL_OFFSET_TABLE_");
995 ptr
= section_ptr_add(s1
->got
, 3 * PTR_SIZE
);
997 /* keep space for _DYNAMIC pointer, if present */
999 /* two dummy got entries */
1003 /* keep space for _DYNAMIC pointer, if present */
1006 /* two dummy got entries */
1014 /* put a got entry corresponding to a symbol in symtab_section. 'size'
1015 and 'info' can be modifed if more precise info comes from the DLL */
1016 static void put_got_entry(TCCState
*s1
,
1017 int reloc_type
, unsigned long size
, int info
,
1023 unsigned long offset
;
1029 /* if a got entry already exists for that symbol, no need to add one */
1030 if (sym_index
< s1
->nb_sym_attrs
&&
1031 s1
->sym_attrs
[sym_index
].got_offset
)
1034 alloc_sym_attr(s1
, sym_index
)->got_offset
= s1
->got
->data_offset
;
1037 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
1038 name
= symtab_section
->link
->data
+ sym
->st_name
;
1039 offset
= sym
->st_value
;
1040 #if defined(TCC_TARGET_I386) || defined(TCC_TARGET_X86_64)
1042 #ifdef TCC_TARGET_X86_64
1052 #if defined(TCC_OUTPUT_DLL_WITH_PLT)
1055 /* if we build a DLL, we add a %ebx offset */
1056 if (s1
->output_type
== TCC_OUTPUT_DLL
)
1062 /* add a PLT entry */
1064 if (plt
->data_offset
== 0) {
1065 /* first plt entry */
1066 p
= section_ptr_add(plt
, 16);
1067 p
[0] = 0xff; /* pushl got + PTR_SIZE */
1068 p
[1] = modrm
+ 0x10;
1069 put32(p
+ 2, PTR_SIZE
);
1070 p
[6] = 0xff; /* jmp *(got + PTR_SIZE * 2) */
1072 put32(p
+ 8, PTR_SIZE
* 2);
1075 p
= section_ptr_add(plt
, 16);
1076 p
[0] = 0xff; /* jmp *(got + x) */
1078 put32(p
+ 2, s1
->got
->data_offset
);
1079 p
[6] = 0x68; /* push $xxx */
1080 put32(p
+ 7, (plt
->data_offset
- 32) >> 1);
1081 p
[11] = 0xe9; /* jmp plt_start */
1082 put32(p
+ 12, -(plt
->data_offset
));
1084 /* the symbol is modified so that it will be relocated to
1086 #if !defined(TCC_OUTPUT_DLL_WITH_PLT)
1087 if (s1
->output_type
== TCC_OUTPUT_EXE
)
1089 offset
= plt
->data_offset
- 16;
1091 #elif defined(TCC_TARGET_ARM)
1092 if (reloc_type
== R_ARM_JUMP_SLOT
) {
1096 /* if we build a DLL, we add a %ebx offset */
1097 if (s1
->output_type
== TCC_OUTPUT_DLL
)
1098 tcc_error("DLLs unimplemented!");
1100 /* add a PLT entry */
1102 if (plt
->data_offset
== 0) {
1103 /* first plt entry */
1104 p
= section_ptr_add(plt
, 16);
1105 put32(p
, 0xe52de004); /* push {lr} */
1106 put32(p
+4, 0xe59fe010); /* ldr lr, [pc, #16] */
1107 put32(p
+8, 0xe08fe00e); /* add lr, pc, lr */
1108 put32(p
+12, 0xe5bef008); /* ldr pc, [lr, #8]! */
1111 if (s1
->sym_attrs
[sym_index
].plt_thumb_stub
) {
1112 p
= section_ptr_add(plt
, 20);
1113 put32(p
, 0x4778); /* bx pc */
1114 put32(p
+2, 0x46c0); /* nop */
1117 p
= section_ptr_add(plt
, 16);
1118 put32(p
, 0xe59fc004); /* ldr ip, [pc, #4] ; GOT entry offset */
1119 put32(p
+4, 0xe08fc00c); /* add ip, pc, ip ; addr of GOT entry */
1120 put32(p
+8, 0xe59cf000); /* ldr pc, [ip] ; jump to GOT entry */
1121 put32(p
+12, s1
->got
->data_offset
); /* GOT entry off once patched */
1123 /* the symbol is modified so that it will be relocated to
1125 if (s1
->output_type
== TCC_OUTPUT_EXE
)
1126 offset
= plt
->data_offset
- 16;
1128 #elif defined(TCC_TARGET_C67)
1129 tcc_error("C67 got not implemented");
1131 #error unsupported CPU
1133 index
= put_elf_sym(s1
->dynsym
, offset
,
1134 size
, info
, 0, sym
->st_shndx
, name
);
1135 /* put a got entry */
1136 put_elf_reloc(s1
->dynsym
, s1
->got
,
1137 s1
->got
->data_offset
,
1140 ptr
= section_ptr_add(s1
->got
, PTR_SIZE
);
1144 /* build GOT and PLT entries */
1145 ST_FUNC
void build_got_entries(TCCState
*s1
)
1148 ElfW_Rel
*rel
, *rel_end
;
1150 int i
, type
, reloc_type
, sym_index
;
1152 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1153 s
= s1
->sections
[i
];
1154 if (s
->sh_type
!= SHT_RELX
)
1156 /* no need to handle got relocations */
1157 if (s
->link
!= symtab_section
)
1159 rel_end
= (ElfW_Rel
*)(s
->data
+ s
->data_offset
);
1160 for(rel
= (ElfW_Rel
*)s
->data
;
1163 type
= ELFW(R_TYPE
)(rel
->r_info
);
1165 #if defined(TCC_TARGET_I386)
1172 if (type
== R_386_GOT32
|| type
== R_386_PLT32
) {
1173 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
1174 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
1175 /* look at the symbol got offset. If none, then add one */
1176 if (type
== R_386_GOT32
)
1177 reloc_type
= R_386_GLOB_DAT
;
1179 reloc_type
= R_386_JMP_SLOT
;
1180 put_got_entry(s1
, reloc_type
, sym
->st_size
, sym
->st_info
,
1184 #elif defined(TCC_TARGET_ARM)
1191 if (type
== R_ARM_GOT32
|| type
== R_ARM_PLT32
) {
1192 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
1193 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
1194 /* look at the symbol got offset. If none, then add one */
1195 if (type
== R_ARM_GOT32
)
1196 reloc_type
= R_ARM_GLOB_DAT
;
1198 reloc_type
= R_ARM_JUMP_SLOT
;
1199 put_got_entry(s1
, reloc_type
, sym
->st_size
, sym
->st_info
,
1203 #elif defined(TCC_TARGET_C67)
1210 if (type
== R_C60_GOT32
|| type
== R_C60_PLT32
) {
1211 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
1212 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
1213 /* look at the symbol got offset. If none, then add one */
1214 if (type
== R_C60_GOT32
)
1215 reloc_type
= R_C60_GLOB_DAT
;
1217 reloc_type
= R_C60_JMP_SLOT
;
1218 put_got_entry(s1
, reloc_type
, sym
->st_size
, sym
->st_info
,
1222 #elif defined(TCC_TARGET_X86_64)
1223 case R_X86_64_GOT32
:
1224 case R_X86_64_GOTTPOFF
:
1225 case R_X86_64_GOTPCREL
:
1226 case R_X86_64_PLT32
:
1229 if (type
== R_X86_64_GOT32
|| type
== R_X86_64_GOTPCREL
||
1230 type
== R_X86_64_PLT32
) {
1231 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
1232 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
1233 /* look at the symbol got offset. If none, then add one */
1234 if (type
== R_X86_64_GOT32
|| type
== R_X86_64_GOTPCREL
)
1235 reloc_type
= R_X86_64_GLOB_DAT
;
1237 reloc_type
= R_X86_64_JUMP_SLOT
;
1238 put_got_entry(s1
, reloc_type
, sym
->st_size
, sym
->st_info
,
1243 #error unsupported CPU
1252 ST_FUNC Section
*new_symtab(TCCState
*s1
,
1253 const char *symtab_name
, int sh_type
, int sh_flags
,
1254 const char *strtab_name
,
1255 const char *hash_name
, int hash_sh_flags
)
1257 Section
*symtab
, *strtab
, *hash
;
1258 int *ptr
, nb_buckets
;
1260 symtab
= new_section(s1
, symtab_name
, sh_type
, sh_flags
);
1261 symtab
->sh_entsize
= sizeof(ElfW(Sym
));
1262 strtab
= new_section(s1
, strtab_name
, SHT_STRTAB
, sh_flags
);
1263 put_elf_str(strtab
, "");
1264 symtab
->link
= strtab
;
1265 put_elf_sym(symtab
, 0, 0, 0, 0, 0, NULL
);
1269 hash
= new_section(s1
, hash_name
, SHT_HASH
, hash_sh_flags
);
1270 hash
->sh_entsize
= sizeof(int);
1271 symtab
->hash
= hash
;
1272 hash
->link
= symtab
;
1274 ptr
= section_ptr_add(hash
, (2 + nb_buckets
+ 1) * sizeof(int));
1275 ptr
[0] = nb_buckets
;
1277 memset(ptr
+ 2, 0, (nb_buckets
+ 1) * sizeof(int));
1281 /* put dynamic tag */
1282 static void put_dt(Section
*dynamic
, int dt
, addr_t val
)
1285 dyn
= section_ptr_add(dynamic
, sizeof(ElfW(Dyn
)));
1287 dyn
->d_un
.d_val
= val
;
1290 static void add_init_array_defines(TCCState
*s1
, const char *section_name
)
1294 char sym_start
[1024];
1297 snprintf(sym_start
, sizeof(sym_start
), "__%s_start", section_name
+ 1);
1298 snprintf(sym_end
, sizeof(sym_end
), "__%s_end", section_name
+ 1);
1300 s
= find_section(s1
, section_name
);
1305 end_offset
= s
->data_offset
;
1308 add_elf_sym(symtab_section
,
1310 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1311 s
->sh_num
, sym_start
);
1312 add_elf_sym(symtab_section
,
1314 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1315 s
->sh_num
, sym_end
);
1318 ST_FUNC
void tcc_add_bcheck(TCCState
*s1
)
1320 #ifdef CONFIG_TCC_BCHECK
1322 Section
*init_section
;
1323 unsigned char *pinit
;
1326 if (0 == s1
->do_bounds_check
)
1329 /* XXX: add an object file to do that */
1330 ptr
= section_ptr_add(bounds_section
, sizeof(unsigned long));
1332 add_elf_sym(symtab_section
, 0, 0,
1333 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1334 bounds_section
->sh_num
, "__bounds_start");
1335 #ifdef TCC_TARGET_I386
1336 if (s1
->output_type
!= TCC_OUTPUT_MEMORY
) {
1337 /* add 'call __bound_init()' in .init section */
1338 init_section
= find_section(s1
, ".init");
1339 pinit
= section_ptr_add(init_section
, 5);
1341 put32(pinit
+ 1, -4);
1342 sym_index
= find_elf_sym(symtab_section
, "__bound_init");
1343 put_elf_reloc(symtab_section
, init_section
,
1344 init_section
->data_offset
- 4, R_386_PC32
, sym_index
);
1350 static inline int tcc_add_support(TCCState
*s1
, const char *filename
)
1353 snprintf(buf
, sizeof(buf
), "%s/%s", s1
->tcc_lib_path
, filename
);
1354 return tcc_add_file(s1
, buf
);
1357 /* add tcc runtime libraries */
1358 ST_FUNC
void tcc_add_runtime(TCCState
*s1
)
1363 if (!s1
->nostdlib
) {
1364 tcc_add_library(s1
, "c");
1365 #ifdef CONFIG_USE_LIBGCC
1366 if (!s1
->static_link
)
1367 tcc_add_file(s1
, TCC_LIBGCC
);
1369 tcc_add_support(s1
, "libtcc1.a");
1371 tcc_add_support(s1
, "libtcc1.a");
1373 /* add crt end if not memory output */
1374 if (s1
->output_type
!= TCC_OUTPUT_MEMORY
)
1375 tcc_add_crt(s1
, "crtn.o");
1379 /* add various standard linker symbols (must be done after the
1380 sections are filled (for example after allocating common
1382 ST_FUNC
void tcc_add_linker_symbols(TCCState
*s1
)
1388 add_elf_sym(symtab_section
,
1389 text_section
->data_offset
, 0,
1390 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1391 text_section
->sh_num
, "_etext");
1392 add_elf_sym(symtab_section
,
1393 data_section
->data_offset
, 0,
1394 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1395 data_section
->sh_num
, "_edata");
1396 add_elf_sym(symtab_section
,
1397 bss_section
->data_offset
, 0,
1398 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1399 bss_section
->sh_num
, "_end");
1400 /* horrible new standard ldscript defines */
1401 add_init_array_defines(s1
, ".preinit_array");
1402 add_init_array_defines(s1
, ".init_array");
1403 add_init_array_defines(s1
, ".fini_array");
1405 /* add start and stop symbols for sections whose name can be
1407 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1408 s
= s1
->sections
[i
];
1409 if (s
->sh_type
== SHT_PROGBITS
&&
1410 (s
->sh_flags
& SHF_ALLOC
)) {
1414 /* check if section name can be expressed in C */
1420 if (!isid(ch
) && !isnum(ch
))
1424 snprintf(buf
, sizeof(buf
), "__start_%s", s
->name
);
1425 add_elf_sym(symtab_section
,
1427 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1429 snprintf(buf
, sizeof(buf
), "__stop_%s", s
->name
);
1430 add_elf_sym(symtab_section
,
1432 ELFW(ST_INFO
)(STB_GLOBAL
, STT_NOTYPE
), 0,
1439 static void tcc_output_binary(TCCState
*s1
, FILE *f
,
1440 const int *section_order
)
1443 int i
, offset
, size
;
1446 for(i
=1;i
<s1
->nb_sections
;i
++) {
1447 s
= s1
->sections
[section_order
[i
]];
1448 if (s
->sh_type
!= SHT_NOBITS
&&
1449 (s
->sh_flags
& SHF_ALLOC
)) {
1450 while (offset
< s
->sh_offset
) {
1455 fwrite(s
->data
, 1, size
, f
);
1461 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1463 #define EXTRA_RELITEMS 14
1465 /* move the relocation value from .dynsym to .got */
1466 void patch_dynsym_undef(TCCState
*s1
, Section
*s
)
1468 uint32_t *gotd
= (void *)s1
->got
->data
;
1469 ElfW(Sym
) *sym
, *sym_end
;
1471 gotd
+= 3; /* dummy entries in .got */
1472 /* relocate symbols in .dynsym */
1473 sym_end
= (ElfW(Sym
) *)(s
->data
+ s
->data_offset
);
1474 for (sym
= (ElfW(Sym
) *)s
->data
+ 1; sym
< sym_end
; sym
++) {
1475 if (sym
->st_shndx
== SHN_UNDEF
) {
1476 *gotd
++ = sym
->st_value
+ 6; /* XXX 6 is magic ? */
1483 #define EXTRA_RELITEMS 9
1485 /* zero plt offsets of weak symbols in .dynsym */
1486 void patch_dynsym_undef(TCCState
*s1
, Section
*s
)
1488 ElfW(Sym
) *sym
, *sym_end
;
1490 sym_end
= (ElfW(Sym
) *)(s
->data
+ s
->data_offset
);
1491 for (sym
= (ElfW(Sym
) *)s
->data
+ 1; sym
< sym_end
; sym
++)
1492 if (sym
->st_shndx
== SHN_UNDEF
&& ELFW(ST_BIND
)(sym
->st_info
) == STB_WEAK
)
1497 ST_FUNC
void fill_got_entry(TCCState
*s1
, ElfW_Rel
*rel
)
1499 int sym_index
= ELFW(R_SYM
) (rel
->r_info
);
1500 ElfW(Sym
) *sym
= &((ElfW(Sym
) *) symtab_section
->data
)[sym_index
];
1501 unsigned long offset
;
1503 if (sym_index
>= s1
->nb_sym_attrs
)
1505 offset
= s1
->sym_attrs
[sym_index
].got_offset
;
1506 section_reserve(s1
->got
, offset
+ PTR_SIZE
);
1507 #ifdef TCC_TARGET_X86_64
1508 /* only works for x86-64 */
1509 put32(s1
->got
->data
+ offset
+ 4, sym
->st_value
>> 32);
1511 put32(s1
->got
->data
+ offset
, sym
->st_value
& 0xffffffff);
1514 ST_FUNC
void fill_got(TCCState
*s1
)
1517 ElfW_Rel
*rel
, *rel_end
;
1520 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1521 s
= s1
->sections
[i
];
1522 if (s
->sh_type
!= SHT_RELX
)
1524 /* no need to handle got relocations */
1525 if (s
->link
!= symtab_section
)
1527 rel_end
= (ElfW_Rel
*) (s
->data
+ s
->data_offset
);
1528 for(rel
= (ElfW_Rel
*) s
->data
; rel
< rel_end
; rel
++) {
1529 switch (ELFW(R_TYPE
) (rel
->r_info
)) {
1530 case R_X86_64_GOT32
:
1531 case R_X86_64_GOTPCREL
:
1532 case R_X86_64_PLT32
:
1533 fill_got_entry(s1
, rel
);
1541 /* output an ELF file */
1542 /* XXX: suppress unneeded sections */
1543 static int elf_output_file(TCCState
*s1
, const char *filename
)
1549 int shnum
, i
, phnum
, file_offset
, offset
, size
, j
, sh_order_index
, k
;
1552 Section
*strsec
, *s
;
1553 ElfW(Shdr
) shdr
, *sh
;
1554 ElfW(Phdr
) *phdr
, *ph
;
1555 Section
*interp
, *dynamic
, *dynstr
;
1556 unsigned long saved_dynamic_data_offset
;
1558 int type
, file_type
;
1559 addr_t rel_addr
, rel_size
;
1560 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1561 addr_t bss_addr
, bss_size
;
1564 file_type
= s1
->output_type
;
1567 if (file_type
!= TCC_OUTPUT_OBJ
) {
1568 tcc_add_runtime(s1
);
1572 section_order
= NULL
;
1575 dynstr
= NULL
; /* avoid warning */
1576 saved_dynamic_data_offset
= 0; /* avoid warning */
1578 if (file_type
!= TCC_OUTPUT_OBJ
) {
1579 relocate_common_syms();
1581 tcc_add_linker_symbols(s1
);
1583 if (!s1
->static_link
) {
1585 int sym_index
, index
;
1586 ElfW(Sym
) *esym
, *sym_end
;
1588 if (file_type
== TCC_OUTPUT_EXE
) {
1590 /* allow override the dynamic loader */
1591 const char *elfint
= getenv("LD_SO");
1593 elfint
= DEFAULT_ELFINTERP(s1
);
1594 /* add interpreter section only if executable */
1595 interp
= new_section(s1
, ".interp", SHT_PROGBITS
, SHF_ALLOC
);
1596 interp
->sh_addralign
= 1;
1597 ptr
= section_ptr_add(interp
, 1+strlen(elfint
));
1598 strcpy(ptr
, elfint
);
1601 /* add dynamic symbol table */
1602 s1
->dynsym
= new_symtab(s1
, ".dynsym", SHT_DYNSYM
, SHF_ALLOC
,
1604 ".hash", SHF_ALLOC
);
1605 dynstr
= s1
->dynsym
->link
;
1607 /* add dynamic section */
1608 dynamic
= new_section(s1
, ".dynamic", SHT_DYNAMIC
,
1609 SHF_ALLOC
| SHF_WRITE
);
1610 dynamic
->link
= dynstr
;
1611 dynamic
->sh_entsize
= sizeof(ElfW(Dyn
));
1614 s1
->plt
= new_section(s1
, ".plt", SHT_PROGBITS
,
1615 SHF_ALLOC
| SHF_EXECINSTR
);
1616 s1
->plt
->sh_entsize
= 4;
1620 /* scan for undefined symbols and see if they are in the
1621 dynamic symbols. If a symbol STT_FUNC or STT_GNU_IFUNC
1622 is found, then we add it in the PLT. If a symbol
1623 STT_OBJECT is found, we add it in the .bss section with
1624 a suitable relocation */
1625 sym_end
= (ElfW(Sym
) *)(symtab_section
->data
+
1626 symtab_section
->data_offset
);
1627 if (file_type
== TCC_OUTPUT_EXE
) {
1628 for(sym
= (ElfW(Sym
) *)symtab_section
->data
+ 1;
1631 if (sym
->st_shndx
== SHN_UNDEF
) {
1632 name
= symtab_section
->link
->data
+ sym
->st_name
;
1633 sym_index
= find_elf_sym(s1
->dynsymtab_section
, name
);
1635 esym
= &((ElfW(Sym
) *)s1
->dynsymtab_section
->data
)[sym_index
];
1636 type
= ELFW(ST_TYPE
)(esym
->st_info
);
1637 if ((type
== STT_FUNC
) || (type
== STT_GNU_IFUNC
)) {
1638 /* Indirect functions shall have STT_FUNC type
1639 * in executable dynsym section. Indeed, a dlsym
1640 * call following a lazy resolution would pick
1641 * the symbol value from the executable dynsym
1642 * entry which would contain the address of the
1643 * function wanted by the caller of dlsym
1644 * instead of the address of the function that
1645 * would return that address */
1646 put_got_entry(s1
, R_JMP_SLOT
, esym
->st_size
,
1647 ELFW(ST_INFO
)(STB_GLOBAL
,STT_FUNC
),
1648 sym
- (ElfW(Sym
) *)symtab_section
->data
);
1649 } else if (type
== STT_OBJECT
) {
1650 unsigned long offset
;
1651 ElfW(Sym
) *dynsym
, *dynsym_end
;
1652 offset
= bss_section
->data_offset
;
1653 /* XXX: which alignment ? */
1654 offset
= (offset
+ 16 - 1) & -16;
1655 index
= put_elf_sym(s1
->dynsym
, offset
, esym
->st_size
,
1657 bss_section
->sh_num
, name
);
1658 /* Ensure R_COPY works for weak symbol aliases */
1659 if (ELFW(ST_BIND
)(esym
->st_info
) == STB_WEAK
) {
1660 dynsym_end
= (ElfW(Sym
) *)
1661 (s1
->dynsymtab_section
->data
+
1662 s1
->dynsymtab_section
->data_offset
);
1663 for(dynsym
= (ElfW(Sym
) *)s1
->dynsymtab_section
->data
+ 1;
1664 dynsym
< dynsym_end
; dynsym
++) {
1665 if ((dynsym
->st_value
== esym
->st_value
)
1666 && (ELFW(ST_BIND
)(dynsym
->st_info
) == STB_GLOBAL
)) {
1668 dynname
= s1
->dynsymtab_section
->link
->data
1670 put_elf_sym(s1
->dynsym
, offset
,
1673 bss_section
->sh_num
,
1679 put_elf_reloc(s1
->dynsym
, bss_section
,
1680 offset
, R_COPY
, index
);
1681 offset
+= esym
->st_size
;
1682 bss_section
->data_offset
= offset
;
1685 /* STB_WEAK undefined symbols are accepted */
1686 /* XXX: _fp_hw seems to be part of the ABI, so we ignore
1688 if (ELFW(ST_BIND
)(sym
->st_info
) == STB_WEAK
||
1689 !strcmp(name
, "_fp_hw")) {
1691 tcc_error_noabort("undefined symbol '%s'", name
);
1694 } else if (s1
->rdynamic
&&
1695 ELFW(ST_BIND
)(sym
->st_info
) != STB_LOCAL
) {
1696 /* if -rdynamic option, then export all non
1698 name
= symtab_section
->link
->data
+ sym
->st_name
;
1699 put_elf_sym(s1
->dynsym
, sym
->st_value
, sym
->st_size
,
1701 sym
->st_shndx
, name
);
1708 /* now look at unresolved dynamic symbols and export
1709 corresponding symbol */
1710 sym_end
= (ElfW(Sym
) *)(s1
->dynsymtab_section
->data
+
1711 s1
->dynsymtab_section
->data_offset
);
1712 for(esym
= (ElfW(Sym
) *)s1
->dynsymtab_section
->data
+ 1;
1715 if (esym
->st_shndx
== SHN_UNDEF
) {
1716 name
= s1
->dynsymtab_section
->link
->data
+ esym
->st_name
;
1717 sym_index
= find_elf_sym(symtab_section
, name
);
1719 /* XXX: avoid adding a symbol if already
1720 present because of -rdynamic ? */
1721 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
1722 put_elf_sym(s1
->dynsym
, sym
->st_value
, sym
->st_size
,
1724 sym
->st_shndx
, name
);
1726 if (ELFW(ST_BIND
)(esym
->st_info
) == STB_WEAK
) {
1727 /* weak symbols can stay undefined */
1729 tcc_warning("undefined dynamic symbol '%s'", name
);
1736 /* shared library case : we simply export all the global symbols */
1737 nb_syms
= symtab_section
->data_offset
/ sizeof(ElfW(Sym
));
1738 s1
->symtab_to_dynsym
= tcc_mallocz(sizeof(int) * nb_syms
);
1739 for(sym
= (ElfW(Sym
) *)symtab_section
->data
+ 1;
1742 if (ELFW(ST_BIND
)(sym
->st_info
) != STB_LOCAL
) {
1743 #if defined(TCC_OUTPUT_DLL_WITH_PLT)
1744 if ((ELFW(ST_TYPE
)(sym
->st_info
) == STT_FUNC
||
1745 ELFW(ST_TYPE
)(sym
->st_info
) == STT_GNU_IFUNC
)
1746 && sym
->st_shndx
== SHN_UNDEF
) {
1747 int visibility
= ELFW(ST_BIND
)(sym
->st_info
);
1748 put_got_entry(s1
, R_JMP_SLOT
, sym
->st_size
,
1749 ELFW(ST_INFO
)(visibility
,STT_FUNC
),
1750 sym
- (ElfW(Sym
) *)symtab_section
->data
);
1752 else if (ELFW(ST_TYPE
)(sym
->st_info
) == STT_OBJECT
) {
1753 put_got_entry(s1
, R_X86_64_GLOB_DAT
, sym
->st_size
,
1755 sym
- (ElfW(Sym
) *)symtab_section
->data
);
1760 name
= symtab_section
->link
->data
+ sym
->st_name
;
1761 index
= put_elf_sym(s1
->dynsym
, sym
->st_value
, sym
->st_size
,
1763 sym
->st_shndx
, name
);
1764 s1
->symtab_to_dynsym
[sym
-
1765 (ElfW(Sym
) *)symtab_section
->data
] =
1772 build_got_entries(s1
);
1774 /* add a list of needed dlls */
1775 for(i
= 0; i
< s1
->nb_loaded_dlls
; i
++) {
1776 DLLReference
*dllref
= s1
->loaded_dlls
[i
];
1777 if (dllref
->level
== 0)
1778 put_dt(dynamic
, DT_NEEDED
, put_elf_str(dynstr
, dllref
->name
));
1782 put_dt(dynamic
, DT_RPATH
, put_elf_str(dynstr
, s1
->rpath
));
1784 /* XXX: currently, since we do not handle PIC code, we
1785 must relocate the readonly segments */
1786 if (file_type
== TCC_OUTPUT_DLL
) {
1788 put_dt(dynamic
, DT_SONAME
, put_elf_str(dynstr
, s1
->soname
));
1789 put_dt(dynamic
, DT_TEXTREL
, 0);
1793 put_dt(dynamic
, DT_SYMBOLIC
, 0);
1795 /* add necessary space for other entries */
1796 saved_dynamic_data_offset
= dynamic
->data_offset
;
1797 dynamic
->data_offset
+= sizeof(ElfW(Dyn
)) * EXTRA_RELITEMS
;
1799 /* still need to build got entries in case of static link */
1800 build_got_entries(s1
);
1804 memset(&ehdr
, 0, sizeof(ehdr
));
1806 /* we add a section for symbols */
1807 strsec
= new_section(s1
, ".shstrtab", SHT_STRTAB
, 0);
1808 put_elf_str(strsec
, "");
1810 /* compute number of sections */
1811 shnum
= s1
->nb_sections
;
1813 /* this array is used to reorder sections in the output file */
1814 section_order
= tcc_malloc(sizeof(int) * shnum
);
1815 section_order
[0] = 0;
1818 /* compute number of program headers */
1821 case TCC_OUTPUT_OBJ
:
1824 case TCC_OUTPUT_EXE
:
1825 if (!s1
->static_link
)
1826 phnum
= 4 + HAVE_PHDR
;
1830 case TCC_OUTPUT_DLL
:
1835 /* allocate strings for section names and decide if an unallocated
1836 section should be output */
1837 /* NOTE: the strsec section comes last, so its size is also
1839 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1840 s
= s1
->sections
[i
];
1841 s
->sh_name
= put_elf_str(strsec
, s
->name
);
1842 /* when generating a DLL, we include relocations but we may
1844 if (file_type
== TCC_OUTPUT_DLL
&&
1845 s
->sh_type
== SHT_RELX
&&
1846 !(s
->sh_flags
& SHF_ALLOC
)) {
1847 /* gr: avoid bogus relocs for empty (debug) sections */
1848 if (s1
->sections
[s
->sh_info
]->sh_flags
& SHF_ALLOC
)
1849 prepare_dynamic_rel(s1
, s
);
1850 else if (s1
->do_debug
)
1851 s
->sh_size
= s
->data_offset
;
1852 } else if (s1
->do_debug
||
1853 file_type
== TCC_OUTPUT_OBJ
||
1854 (s
->sh_flags
& SHF_ALLOC
) ||
1855 i
== (s1
->nb_sections
- 1)) {
1856 /* we output all sections if debug or object file */
1857 s
->sh_size
= s
->data_offset
;
1861 /* allocate program segment headers */
1862 phdr
= tcc_mallocz(phnum
* sizeof(ElfW(Phdr
)));
1864 if (s1
->output_format
== TCC_OUTPUT_FORMAT_ELF
) {
1865 file_offset
= sizeof(ElfW(Ehdr
)) + phnum
* sizeof(ElfW(Phdr
));
1870 /* compute section to program header mapping */
1871 if (s1
->has_text_addr
) {
1872 int a_offset
, p_offset
;
1873 addr
= s1
->text_addr
;
1874 /* we ensure that (addr % ELF_PAGE_SIZE) == file_offset %
1876 a_offset
= (int) (addr
& (s1
->section_align
- 1));
1877 p_offset
= file_offset
& (s1
->section_align
- 1);
1878 if (a_offset
< p_offset
)
1879 a_offset
+= s1
->section_align
;
1880 file_offset
+= (a_offset
- p_offset
);
1882 if (file_type
== TCC_OUTPUT_DLL
)
1885 addr
= ELF_START_ADDR
;
1886 /* compute address after headers */
1887 addr
+= (file_offset
& (s1
->section_align
- 1));
1890 /* dynamic relocation table information, for .dynamic section */
1894 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1895 bss_addr
= bss_size
= 0;
1897 /* leave one program header for the program interpreter */
1900 ph
+= 1 + HAVE_PHDR
;
1902 for(j
= 0; j
< 2; j
++) {
1903 ph
->p_type
= PT_LOAD
;
1905 ph
->p_flags
= PF_R
| PF_X
;
1907 ph
->p_flags
= PF_R
| PF_W
;
1908 ph
->p_align
= s1
->section_align
;
1910 /* we do the following ordering: interp, symbol tables,
1911 relocations, progbits, nobits */
1912 /* XXX: do faster and simpler sorting */
1913 for(k
= 0; k
< 5; k
++) {
1914 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1915 s
= s1
->sections
[i
];
1916 /* compute if section should be included */
1918 if ((s
->sh_flags
& (SHF_ALLOC
| SHF_WRITE
)) !=
1922 if ((s
->sh_flags
& (SHF_ALLOC
| SHF_WRITE
)) !=
1923 (SHF_ALLOC
| SHF_WRITE
))
1929 } else if (s
->sh_type
== SHT_DYNSYM
||
1930 s
->sh_type
== SHT_STRTAB
||
1931 s
->sh_type
== SHT_HASH
) {
1934 } else if (s
->sh_type
== SHT_RELX
) {
1937 } else if (s
->sh_type
== SHT_NOBITS
) {
1944 section_order
[sh_order_index
++] = i
;
1946 /* section matches: we align it and add its size */
1948 addr
= (addr
+ s
->sh_addralign
- 1) &
1949 ~(s
->sh_addralign
- 1);
1950 file_offset
+= (int) ( addr
- tmp
);
1951 s
->sh_offset
= file_offset
;
1954 /* update program header infos */
1955 if (ph
->p_offset
== 0) {
1956 ph
->p_offset
= file_offset
;
1958 ph
->p_paddr
= ph
->p_vaddr
;
1960 /* update dynamic relocation infos */
1961 if (s
->sh_type
== SHT_RELX
) {
1962 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1963 if (!strcmp(strsec
->data
+ s
->sh_name
, ".rel.got")) {
1965 rel_size
+= s
->sh_size
; /* XXX only first rel. */
1967 if (!strcmp(strsec
->data
+ s
->sh_name
, ".rel.bss")) {
1969 bss_size
= s
->sh_size
; /* XXX only first rel. */
1974 rel_size
+= s
->sh_size
;
1978 if (s
->sh_type
!= SHT_NOBITS
)
1979 file_offset
+= s
->sh_size
;
1982 ph
->p_filesz
= file_offset
- ph
->p_offset
;
1983 ph
->p_memsz
= addr
- ph
->p_vaddr
;
1986 if (s1
->output_format
== TCC_OUTPUT_FORMAT_ELF
) {
1987 /* if in the middle of a page, we duplicate the page in
1988 memory so that one copy is RX and the other is RW */
1989 if ((addr
& (s1
->section_align
- 1)) != 0)
1990 addr
+= s1
->section_align
;
1992 addr
= (addr
+ s1
->section_align
- 1) & ~(s1
->section_align
- 1);
1993 file_offset
= (file_offset
+ s1
->section_align
- 1) &
1994 ~(s1
->section_align
- 1);
1999 /* if interpreter, then add corresponing program header */
2003 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2005 int len
= phnum
* sizeof(ElfW(Phdr
));
2007 ph
->p_type
= PT_PHDR
;
2008 ph
->p_offset
= sizeof(ElfW(Ehdr
));
2009 ph
->p_vaddr
= interp
->sh_addr
- len
;
2010 ph
->p_paddr
= ph
->p_vaddr
;
2011 ph
->p_filesz
= ph
->p_memsz
= len
;
2012 ph
->p_flags
= PF_R
| PF_X
;
2013 ph
->p_align
= 4; /* interp->sh_addralign; */
2018 ph
->p_type
= PT_INTERP
;
2019 ph
->p_offset
= interp
->sh_offset
;
2020 ph
->p_vaddr
= interp
->sh_addr
;
2021 ph
->p_paddr
= ph
->p_vaddr
;
2022 ph
->p_filesz
= interp
->sh_size
;
2023 ph
->p_memsz
= interp
->sh_size
;
2025 ph
->p_align
= interp
->sh_addralign
;
2028 /* if dynamic section, then add corresponing program header */
2032 ph
= &phdr
[phnum
- 1];
2034 ph
->p_type
= PT_DYNAMIC
;
2035 ph
->p_offset
= dynamic
->sh_offset
;
2036 ph
->p_vaddr
= dynamic
->sh_addr
;
2037 ph
->p_paddr
= ph
->p_vaddr
;
2038 ph
->p_filesz
= dynamic
->sh_size
;
2039 ph
->p_memsz
= dynamic
->sh_size
;
2040 ph
->p_flags
= PF_R
| PF_W
;
2041 ph
->p_align
= dynamic
->sh_addralign
;
2043 /* put GOT dynamic section address */
2044 put32(s1
->got
->data
, dynamic
->sh_addr
);
2046 /* relocate the PLT */
2047 if (file_type
== TCC_OUTPUT_EXE
2048 #if defined(TCC_OUTPUT_DLL_WITH_PLT)
2049 || file_type
== TCC_OUTPUT_DLL
2055 p_end
= p
+ s1
->plt
->data_offset
;
2057 #if defined(TCC_TARGET_I386)
2058 put32(p
+ 2, get32(p
+ 2) + s1
->got
->sh_addr
);
2059 put32(p
+ 8, get32(p
+ 8) + s1
->got
->sh_addr
);
2062 put32(p
+ 2, get32(p
+ 2) + s1
->got
->sh_addr
);
2065 #elif defined(TCC_TARGET_X86_64)
2066 int x
= s1
->got
->sh_addr
- s1
->plt
->sh_addr
- 6;
2067 put32(p
+ 2, get32(p
+ 2) + x
);
2068 put32(p
+ 8, get32(p
+ 8) + x
- 6);
2071 put32(p
+ 2, get32(p
+ 2) + x
+ s1
->plt
->data
- p
);
2074 #elif defined(TCC_TARGET_ARM)
2076 x
=s1
->got
->sh_addr
- s1
->plt
->sh_addr
- 12;
2079 if (get32(p
) == 0x46c04778) /* PLT Thumb stub present */
2081 put32(p
+ 12, x
+ get32(p
+ 12) + s1
->plt
->data
- p
);
2084 #elif defined(TCC_TARGET_C67)
2087 #error unsupported CPU
2092 /* relocate symbols in .dynsym */
2093 sym_end
= (ElfW(Sym
) *)(s1
->dynsym
->data
+ s1
->dynsym
->data_offset
);
2094 for(sym
= (ElfW(Sym
) *)s1
->dynsym
->data
+ 1;
2097 if (sym
->st_shndx
== SHN_UNDEF
) {
2098 /* relocate to the PLT if the symbol corresponds
2101 sym
->st_value
+= s1
->plt
->sh_addr
;
2102 } else if (sym
->st_shndx
< SHN_LORESERVE
) {
2103 /* do symbol relocation */
2104 sym
->st_value
+= s1
->sections
[sym
->st_shndx
]->sh_addr
;
2108 /* put dynamic section entries */
2109 dynamic
->data_offset
= saved_dynamic_data_offset
;
2110 put_dt(dynamic
, DT_HASH
, s1
->dynsym
->hash
->sh_addr
);
2111 put_dt(dynamic
, DT_STRTAB
, dynstr
->sh_addr
);
2112 put_dt(dynamic
, DT_SYMTAB
, s1
->dynsym
->sh_addr
);
2113 put_dt(dynamic
, DT_STRSZ
, dynstr
->data_offset
);
2114 put_dt(dynamic
, DT_SYMENT
, sizeof(ElfW(Sym
)));
2115 #ifdef TCC_TARGET_X86_64
2116 put_dt(dynamic
, DT_RELA
, rel_addr
);
2117 put_dt(dynamic
, DT_RELASZ
, rel_size
);
2118 put_dt(dynamic
, DT_RELAENT
, sizeof(ElfW_Rel
));
2120 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2121 put_dt(dynamic
, DT_PLTGOT
, s1
->got
->sh_addr
);
2122 put_dt(dynamic
, DT_PLTRELSZ
, rel_size
);
2123 put_dt(dynamic
, DT_JMPREL
, rel_addr
);
2124 put_dt(dynamic
, DT_PLTREL
, DT_REL
);
2125 put_dt(dynamic
, DT_REL
, bss_addr
);
2126 put_dt(dynamic
, DT_RELSZ
, bss_size
);
2128 put_dt(dynamic
, DT_REL
, rel_addr
);
2129 put_dt(dynamic
, DT_RELSZ
, rel_size
);
2130 put_dt(dynamic
, DT_RELENT
, sizeof(ElfW_Rel
));
2134 put_dt(dynamic
, DT_DEBUG
, 0);
2135 put_dt(dynamic
, DT_NULL
, 0);
2138 ehdr
.e_phentsize
= sizeof(ElfW(Phdr
));
2139 ehdr
.e_phnum
= phnum
;
2140 ehdr
.e_phoff
= sizeof(ElfW(Ehdr
));
2143 /* all other sections come after */
2144 for(i
= 1; i
< s1
->nb_sections
; i
++) {
2145 s
= s1
->sections
[i
];
2146 if (phnum
> 0 && (s
->sh_flags
& SHF_ALLOC
))
2148 section_order
[sh_order_index
++] = i
;
2150 file_offset
= (file_offset
+ s
->sh_addralign
- 1) &
2151 ~(s
->sh_addralign
- 1);
2152 s
->sh_offset
= file_offset
;
2153 if (s
->sh_type
!= SHT_NOBITS
)
2154 file_offset
+= s
->sh_size
;
2157 /* if building executable or DLL, then relocate each section
2158 except the GOT which is already relocated */
2159 if (file_type
!= TCC_OUTPUT_OBJ
) {
2160 relocate_syms(s1
, 0);
2162 if (s1
->nb_errors
!= 0) {
2168 /* relocate sections */
2169 /* XXX: ignore sections with allocated relocations ? */
2170 for(i
= 1; i
< s1
->nb_sections
; i
++) {
2171 s
= s1
->sections
[i
];
2172 if (s
->reloc
&& s
!= s1
->got
)
2173 relocate_section(s1
, s
);
2176 /* relocate relocation entries if the relocation tables are
2177 allocated in the executable */
2178 for(i
= 1; i
< s1
->nb_sections
; i
++) {
2179 s
= s1
->sections
[i
];
2180 if ((s
->sh_flags
& SHF_ALLOC
) &&
2181 s
->sh_type
== SHT_RELX
) {
2182 relocate_rel(s1
, s
);
2186 /* get entry point address */
2187 if (file_type
== TCC_OUTPUT_EXE
)
2188 ehdr
.e_entry
= get_elf_sym_addr(s1
, "_start", 1);
2190 ehdr
.e_entry
= text_section
->sh_addr
; /* XXX: is it correct ? */
2192 if (file_type
== TCC_OUTPUT_EXE
&& s1
->static_link
)
2195 /* write elf file */
2196 if (file_type
== TCC_OUTPUT_OBJ
)
2201 fd
= open(filename
, O_WRONLY
| O_CREAT
| O_TRUNC
| O_BINARY
, mode
);
2203 tcc_error_noabort("could not write '%s'", filename
);
2206 f
= fdopen(fd
, "wb");
2208 printf("<- %s\n", filename
);
2210 #ifdef TCC_TARGET_COFF
2211 if (s1
->output_format
== TCC_OUTPUT_FORMAT_COFF
) {
2212 tcc_output_coff(s1
, f
);
2215 if (s1
->output_format
== TCC_OUTPUT_FORMAT_ELF
) {
2216 sort_syms(s1
, symtab_section
);
2219 file_offset
= (file_offset
+ 3) & -4;
2222 ehdr
.e_ident
[0] = ELFMAG0
;
2223 ehdr
.e_ident
[1] = ELFMAG1
;
2224 ehdr
.e_ident
[2] = ELFMAG2
;
2225 ehdr
.e_ident
[3] = ELFMAG3
;
2226 ehdr
.e_ident
[4] = ELFCLASSW
;
2227 ehdr
.e_ident
[5] = ELFDATA2LSB
;
2228 ehdr
.e_ident
[6] = EV_CURRENT
;
2229 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2230 ehdr
.e_ident
[EI_OSABI
] = ELFOSABI_FREEBSD
;
2232 #ifdef TCC_TARGET_ARM
2234 ehdr
.e_ident
[EI_OSABI
] = 0;
2235 ehdr
.e_flags
= EF_ARM_EABI_VER4
;
2236 if (file_type
== TCC_OUTPUT_EXE
|| file_type
== TCC_OUTPUT_DLL
)
2237 ehdr
.e_flags
|= EF_ARM_HASENTRY
;
2238 if (s1
->float_abi
== ARM_HARD_FLOAT
)
2239 ehdr
.e_flags
|= EF_ARM_VFP_FLOAT
;
2241 ehdr
.e_flags
|= EF_ARM_SOFT_FLOAT
;
2243 ehdr
.e_ident
[EI_OSABI
] = ELFOSABI_ARM
;
2248 case TCC_OUTPUT_EXE
:
2249 ehdr
.e_type
= ET_EXEC
;
2251 case TCC_OUTPUT_DLL
:
2252 ehdr
.e_type
= ET_DYN
;
2254 case TCC_OUTPUT_OBJ
:
2255 ehdr
.e_type
= ET_REL
;
2258 ehdr
.e_machine
= EM_TCC_TARGET
;
2259 ehdr
.e_version
= EV_CURRENT
;
2260 ehdr
.e_shoff
= file_offset
;
2261 ehdr
.e_ehsize
= sizeof(ElfW(Ehdr
));
2262 ehdr
.e_shentsize
= sizeof(ElfW(Shdr
));
2263 ehdr
.e_shnum
= shnum
;
2264 ehdr
.e_shstrndx
= shnum
- 1;
2266 fwrite(&ehdr
, 1, sizeof(ElfW(Ehdr
)), f
);
2267 fwrite(phdr
, 1, phnum
* sizeof(ElfW(Phdr
)), f
);
2268 offset
= sizeof(ElfW(Ehdr
)) + phnum
* sizeof(ElfW(Phdr
));
2270 for(i
=1;i
<s1
->nb_sections
;i
++) {
2271 s
= s1
->sections
[section_order
[i
]];
2272 if (s
->sh_type
!= SHT_NOBITS
) {
2273 if (s
->sh_type
== SHT_DYNSYM
)
2274 patch_dynsym_undef(s1
, s
);
2275 while (offset
< s
->sh_offset
) {
2280 fwrite(s
->data
, 1, size
, f
);
2285 /* output section headers */
2286 while (offset
< ehdr
.e_shoff
) {
2291 for(i
=0;i
<s1
->nb_sections
;i
++) {
2293 memset(sh
, 0, sizeof(ElfW(Shdr
)));
2294 s
= s1
->sections
[i
];
2296 sh
->sh_name
= s
->sh_name
;
2297 sh
->sh_type
= s
->sh_type
;
2298 sh
->sh_flags
= s
->sh_flags
;
2299 sh
->sh_entsize
= s
->sh_entsize
;
2300 sh
->sh_info
= s
->sh_info
;
2302 sh
->sh_link
= s
->link
->sh_num
;
2303 sh
->sh_addralign
= s
->sh_addralign
;
2304 sh
->sh_addr
= s
->sh_addr
;
2305 sh
->sh_offset
= s
->sh_offset
;
2306 sh
->sh_size
= s
->sh_size
;
2308 fwrite(sh
, 1, sizeof(ElfW(Shdr
)), f
);
2311 tcc_output_binary(s1
, f
, section_order
);
2317 tcc_free(s1
->symtab_to_dynsym
);
2318 tcc_free(section_order
);
2320 tcc_free(s1
->sym_attrs
);
2324 LIBTCCAPI
int tcc_output_file(TCCState
*s
, const char *filename
)
2327 #ifdef TCC_TARGET_PE
2328 if (s
->output_type
!= TCC_OUTPUT_OBJ
) {
2329 ret
= pe_output_file(s
, filename
);
2333 ret
= elf_output_file(s
, filename
);
2338 static void *load_data(int fd
, unsigned long file_offset
, unsigned long size
)
2342 data
= tcc_malloc(size
);
2343 lseek(fd
, file_offset
, SEEK_SET
);
2344 read(fd
, data
, size
);
2348 typedef struct SectionMergeInfo
{
2349 Section
*s
; /* corresponding existing section */
2350 unsigned long offset
; /* offset of the new section in the existing section */
2351 uint8_t new_section
; /* true if section 's' was added */
2352 uint8_t link_once
; /* true if link once section */
2355 /* load an object file and merge it with current files */
2356 /* XXX: handle correctly stab (debug) info */
2357 ST_FUNC
int tcc_load_object_file(TCCState
*s1
,
2358 int fd
, unsigned long file_offset
)
2361 ElfW(Shdr
) *shdr
, *sh
;
2362 int size
, i
, j
, offset
, offseti
, nb_syms
, sym_index
, ret
;
2363 unsigned char *strsec
, *strtab
;
2364 int *old_to_new_syms
;
2365 char *sh_name
, *name
;
2366 SectionMergeInfo
*sm_table
, *sm
;
2367 ElfW(Sym
) *sym
, *symtab
;
2368 ElfW_Rel
*rel
, *rel_end
;
2374 stab_index
= stabstr_index
= 0;
2376 if (read(fd
, &ehdr
, sizeof(ehdr
)) != sizeof(ehdr
))
2378 if (ehdr
.e_ident
[0] != ELFMAG0
||
2379 ehdr
.e_ident
[1] != ELFMAG1
||
2380 ehdr
.e_ident
[2] != ELFMAG2
||
2381 ehdr
.e_ident
[3] != ELFMAG3
)
2383 /* test if object file */
2384 if (ehdr
.e_type
!= ET_REL
)
2386 /* test CPU specific stuff */
2387 if (ehdr
.e_ident
[5] != ELFDATA2LSB
||
2388 ehdr
.e_machine
!= EM_TCC_TARGET
) {
2390 tcc_error_noabort("invalid object file");
2394 shdr
= load_data(fd
, file_offset
+ ehdr
.e_shoff
,
2395 sizeof(ElfW(Shdr
)) * ehdr
.e_shnum
);
2396 sm_table
= tcc_mallocz(sizeof(SectionMergeInfo
) * ehdr
.e_shnum
);
2398 /* load section names */
2399 sh
= &shdr
[ehdr
.e_shstrndx
];
2400 strsec
= load_data(fd
, file_offset
+ sh
->sh_offset
, sh
->sh_size
);
2402 /* load symtab and strtab */
2403 old_to_new_syms
= NULL
;
2407 for(i
= 1; i
< ehdr
.e_shnum
; i
++) {
2409 if (sh
->sh_type
== SHT_SYMTAB
) {
2411 tcc_error_noabort("object must contain only one symtab");
2416 nb_syms
= sh
->sh_size
/ sizeof(ElfW(Sym
));
2417 symtab
= load_data(fd
, file_offset
+ sh
->sh_offset
, sh
->sh_size
);
2418 sm_table
[i
].s
= symtab_section
;
2420 /* now load strtab */
2421 sh
= &shdr
[sh
->sh_link
];
2422 strtab
= load_data(fd
, file_offset
+ sh
->sh_offset
, sh
->sh_size
);
2426 /* now examine each section and try to merge its content with the
2428 for(i
= 1; i
< ehdr
.e_shnum
; i
++) {
2429 /* no need to examine section name strtab */
2430 if (i
== ehdr
.e_shstrndx
)
2433 sh_name
= strsec
+ sh
->sh_name
;
2434 /* ignore sections types we do not handle */
2435 if (sh
->sh_type
!= SHT_PROGBITS
&&
2436 sh
->sh_type
!= SHT_RELX
&&
2438 sh
->sh_type
!= SHT_ARM_EXIDX
&&
2440 sh
->sh_type
!= SHT_NOBITS
&&
2441 sh
->sh_type
!= SHT_PREINIT_ARRAY
&&
2442 sh
->sh_type
!= SHT_INIT_ARRAY
&&
2443 sh
->sh_type
!= SHT_FINI_ARRAY
&&
2444 strcmp(sh_name
, ".stabstr")
2447 if (sh
->sh_addralign
< 1)
2448 sh
->sh_addralign
= 1;
2449 /* find corresponding section, if any */
2450 for(j
= 1; j
< s1
->nb_sections
;j
++) {
2451 s
= s1
->sections
[j
];
2452 if (!strcmp(s
->name
, sh_name
)) {
2453 if (!strncmp(sh_name
, ".gnu.linkonce",
2454 sizeof(".gnu.linkonce") - 1)) {
2455 /* if a 'linkonce' section is already present, we
2456 do not add it again. It is a little tricky as
2457 symbols can still be defined in
2459 sm_table
[i
].link_once
= 1;
2466 /* not found: create new section */
2467 s
= new_section(s1
, sh_name
, sh
->sh_type
, sh
->sh_flags
);
2468 /* take as much info as possible from the section. sh_link and
2469 sh_info will be updated later */
2470 s
->sh_addralign
= sh
->sh_addralign
;
2471 s
->sh_entsize
= sh
->sh_entsize
;
2472 sm_table
[i
].new_section
= 1;
2474 if (sh
->sh_type
!= s
->sh_type
) {
2475 tcc_error_noabort("invalid section type");
2479 /* align start of section */
2480 offset
= s
->data_offset
;
2482 if (0 == strcmp(sh_name
, ".stab")) {
2486 if (0 == strcmp(sh_name
, ".stabstr")) {
2491 size
= sh
->sh_addralign
- 1;
2492 offset
= (offset
+ size
) & ~size
;
2493 if (sh
->sh_addralign
> s
->sh_addralign
)
2494 s
->sh_addralign
= sh
->sh_addralign
;
2495 s
->data_offset
= offset
;
2497 sm_table
[i
].offset
= offset
;
2499 /* concatenate sections */
2501 if (sh
->sh_type
!= SHT_NOBITS
) {
2503 lseek(fd
, file_offset
+ sh
->sh_offset
, SEEK_SET
);
2504 ptr
= section_ptr_add(s
, size
);
2505 read(fd
, ptr
, size
);
2507 s
->data_offset
+= size
;
2512 /* gr relocate stab strings */
2513 if (stab_index
&& stabstr_index
) {
2516 s
= sm_table
[stab_index
].s
;
2517 a
= (Stab_Sym
*)(s
->data
+ sm_table
[stab_index
].offset
);
2518 b
= (Stab_Sym
*)(s
->data
+ s
->data_offset
);
2519 o
= sm_table
[stabstr_index
].offset
;
2521 a
->n_strx
+= o
, a
++;
2524 /* second short pass to update sh_link and sh_info fields of new
2526 for(i
= 1; i
< ehdr
.e_shnum
; i
++) {
2528 if (!s
|| !sm_table
[i
].new_section
)
2531 if (sh
->sh_link
> 0)
2532 s
->link
= sm_table
[sh
->sh_link
].s
;
2533 if (sh
->sh_type
== SHT_RELX
) {
2534 s
->sh_info
= sm_table
[sh
->sh_info
].s
->sh_num
;
2535 /* update backward link */
2536 s1
->sections
[s
->sh_info
]->reloc
= s
;
2541 /* resolve symbols */
2542 old_to_new_syms
= tcc_mallocz(nb_syms
* sizeof(int));
2545 for(i
= 1; i
< nb_syms
; i
++, sym
++) {
2546 if (sym
->st_shndx
!= SHN_UNDEF
&&
2547 sym
->st_shndx
< SHN_LORESERVE
) {
2548 sm
= &sm_table
[sym
->st_shndx
];
2549 if (sm
->link_once
) {
2550 /* if a symbol is in a link once section, we use the
2551 already defined symbol. It is very important to get
2552 correct relocations */
2553 if (ELFW(ST_BIND
)(sym
->st_info
) != STB_LOCAL
) {
2554 name
= strtab
+ sym
->st_name
;
2555 sym_index
= find_elf_sym(symtab_section
, name
);
2557 old_to_new_syms
[i
] = sym_index
;
2561 /* if no corresponding section added, no need to add symbol */
2564 /* convert section number */
2565 sym
->st_shndx
= sm
->s
->sh_num
;
2567 sym
->st_value
+= sm
->offset
;
2570 name
= strtab
+ sym
->st_name
;
2571 sym_index
= add_elf_sym(symtab_section
, sym
->st_value
, sym
->st_size
,
2572 sym
->st_info
, sym
->st_other
,
2573 sym
->st_shndx
, name
);
2574 old_to_new_syms
[i
] = sym_index
;
2577 /* third pass to patch relocation entries */
2578 for(i
= 1; i
< ehdr
.e_shnum
; i
++) {
2583 offset
= sm_table
[i
].offset
;
2584 switch(s
->sh_type
) {
2586 /* take relocation offset information */
2587 offseti
= sm_table
[sh
->sh_info
].offset
;
2588 rel_end
= (ElfW_Rel
*)(s
->data
+ s
->data_offset
);
2589 for(rel
= (ElfW_Rel
*)(s
->data
+ offset
);
2594 /* convert symbol index */
2595 type
= ELFW(R_TYPE
)(rel
->r_info
);
2596 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
2597 /* NOTE: only one symtab assumed */
2598 if (sym_index
>= nb_syms
)
2600 sym_index
= old_to_new_syms
[sym_index
];
2601 /* ignore link_once in rel section. */
2602 if (!sym_index
&& !sm
->link_once
2603 #ifdef TCC_TARGET_ARM
2604 && type
!= R_ARM_V4BX
2608 tcc_error_noabort("Invalid relocation entry [%2d] '%s' @ %.8x",
2609 i
, strsec
+ sh
->sh_name
, rel
->r_offset
);
2612 rel
->r_info
= ELFW(R_INFO
)(sym_index
, type
);
2613 /* offset the relocation offset */
2614 rel
->r_offset
+= offseti
;
2615 #ifdef TCC_TARGET_ARM
2616 /* Jumps and branches from a Thumb code to a PLT entry need
2617 special handling since PLT entries are ARM code.
2618 Unconditional bl instructions referencing PLT entries are
2619 handled by converting these instructions into blx
2620 instructions. Other case of instructions referencing a PLT
2621 entry require to add a Thumb stub before the PLT entry to
2622 switch to ARM mode. We set bit 0 of the got offset of a
2623 symbol to indicate such a case. */
2624 if (type
== R_ARM_THM_JUMP24
)
2625 alloc_sym_attr(s1
, sym_index
)->plt_thumb_stub
= 1;
2638 tcc_free(old_to_new_syms
);
2645 typedef struct ArchiveHeader
{
2646 char ar_name
[16]; /* name of this member */
2647 char ar_date
[12]; /* file mtime */
2648 char ar_uid
[6]; /* owner uid; printed as decimal */
2649 char ar_gid
[6]; /* owner gid; printed as decimal */
2650 char ar_mode
[8]; /* file mode, printed as octal */
2651 char ar_size
[10]; /* file size, printed as decimal */
2652 char ar_fmag
[2]; /* should contain ARFMAG */
2655 static int get_be32(const uint8_t *b
)
2657 return b
[3] | (b
[2] << 8) | (b
[1] << 16) | (b
[0] << 24);
2660 /* load only the objects which resolve undefined symbols */
2661 static int tcc_load_alacarte(TCCState
*s1
, int fd
, int size
)
2663 int i
, bound
, nsyms
, sym_index
, off
, ret
;
2665 const char *ar_names
, *p
;
2666 const uint8_t *ar_index
;
2669 data
= tcc_malloc(size
);
2670 if (read(fd
, data
, size
) != size
)
2672 nsyms
= get_be32(data
);
2673 ar_index
= data
+ 4;
2674 ar_names
= ar_index
+ nsyms
* 4;
2678 for(p
= ar_names
, i
= 0; i
< nsyms
; i
++, p
+= strlen(p
)+1) {
2679 sym_index
= find_elf_sym(symtab_section
, p
);
2681 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
2682 if(sym
->st_shndx
== SHN_UNDEF
) {
2683 off
= get_be32(ar_index
+ i
* 4) + sizeof(ArchiveHeader
);
2685 lseek(fd
, off
, SEEK_SET
);
2686 if(tcc_load_object_file(s1
, fd
, off
) < 0) {
2701 /* load a '.a' file */
2702 ST_FUNC
int tcc_load_archive(TCCState
*s1
, int fd
)
2709 unsigned long file_offset
;
2711 /* skip magic which was already checked */
2712 read(fd
, magic
, sizeof(magic
));
2715 len
= read(fd
, &hdr
, sizeof(hdr
));
2718 if (len
!= sizeof(hdr
)) {
2719 tcc_error_noabort("invalid archive");
2722 memcpy(ar_size
, hdr
.ar_size
, sizeof(hdr
.ar_size
));
2723 ar_size
[sizeof(hdr
.ar_size
)] = '\0';
2724 size
= strtol(ar_size
, NULL
, 0);
2725 memcpy(ar_name
, hdr
.ar_name
, sizeof(hdr
.ar_name
));
2726 for(i
= sizeof(hdr
.ar_name
) - 1; i
>= 0; i
--) {
2727 if (ar_name
[i
] != ' ')
2730 ar_name
[i
+ 1] = '\0';
2731 file_offset
= lseek(fd
, 0, SEEK_CUR
);
2733 size
= (size
+ 1) & ~1;
2734 if (!strcmp(ar_name
, "/")) {
2735 /* coff symbol table : we handle it */
2736 if(s1
->alacarte_link
)
2737 return tcc_load_alacarte(s1
, fd
, size
);
2738 } else if (!strcmp(ar_name
, "//") ||
2739 !strcmp(ar_name
, "__.SYMDEF") ||
2740 !strcmp(ar_name
, "__.SYMDEF/") ||
2741 !strcmp(ar_name
, "ARFILENAMES/")) {
2742 /* skip symbol table or archive names */
2744 if (tcc_load_object_file(s1
, fd
, file_offset
) < 0)
2747 lseek(fd
, file_offset
+ size
, SEEK_SET
);
2752 #ifndef TCC_TARGET_PE
2753 /* load a DLL and all referenced DLLs. 'level = 0' means that the DLL
2754 is referenced by the user (so it should be added as DT_NEEDED in
2755 the generated ELF file) */
2756 ST_FUNC
int tcc_load_dll(TCCState
*s1
, int fd
, const char *filename
, int level
)
2759 ElfW(Shdr
) *shdr
, *sh
, *sh1
;
2760 int i
, j
, nb_syms
, nb_dts
, sym_bind
, ret
;
2761 ElfW(Sym
) *sym
, *dynsym
;
2762 ElfW(Dyn
) *dt
, *dynamic
;
2763 unsigned char *dynstr
;
2764 const char *name
, *soname
;
2765 DLLReference
*dllref
;
2767 read(fd
, &ehdr
, sizeof(ehdr
));
2769 /* test CPU specific stuff */
2770 if (ehdr
.e_ident
[5] != ELFDATA2LSB
||
2771 ehdr
.e_machine
!= EM_TCC_TARGET
) {
2772 tcc_error_noabort("bad architecture");
2777 shdr
= load_data(fd
, ehdr
.e_shoff
, sizeof(ElfW(Shdr
)) * ehdr
.e_shnum
);
2779 /* load dynamic section and dynamic symbols */
2783 dynsym
= NULL
; /* avoid warning */
2784 dynstr
= NULL
; /* avoid warning */
2785 for(i
= 0, sh
= shdr
; i
< ehdr
.e_shnum
; i
++, sh
++) {
2786 switch(sh
->sh_type
) {
2788 nb_dts
= sh
->sh_size
/ sizeof(ElfW(Dyn
));
2789 dynamic
= load_data(fd
, sh
->sh_offset
, sh
->sh_size
);
2792 nb_syms
= sh
->sh_size
/ sizeof(ElfW(Sym
));
2793 dynsym
= load_data(fd
, sh
->sh_offset
, sh
->sh_size
);
2794 sh1
= &shdr
[sh
->sh_link
];
2795 dynstr
= load_data(fd
, sh1
->sh_offset
, sh1
->sh_size
);
2802 /* compute the real library name */
2803 soname
= tcc_basename(filename
);
2805 for(i
= 0, dt
= dynamic
; i
< nb_dts
; i
++, dt
++) {
2806 if (dt
->d_tag
== DT_SONAME
) {
2807 soname
= dynstr
+ dt
->d_un
.d_val
;
2811 /* if the dll is already loaded, do not load it */
2812 for(i
= 0; i
< s1
->nb_loaded_dlls
; i
++) {
2813 dllref
= s1
->loaded_dlls
[i
];
2814 if (!strcmp(soname
, dllref
->name
)) {
2815 /* but update level if needed */
2816 if (level
< dllref
->level
)
2817 dllref
->level
= level
;
2823 /* add the dll and its level */
2824 dllref
= tcc_mallocz(sizeof(DLLReference
) + strlen(soname
));
2825 dllref
->level
= level
;
2826 strcpy(dllref
->name
, soname
);
2827 dynarray_add((void ***)&s1
->loaded_dlls
, &s1
->nb_loaded_dlls
, dllref
);
2829 /* add dynamic symbols in dynsym_section */
2830 for(i
= 1, sym
= dynsym
+ 1; i
< nb_syms
; i
++, sym
++) {
2831 sym_bind
= ELFW(ST_BIND
)(sym
->st_info
);
2832 if (sym_bind
== STB_LOCAL
)
2834 name
= dynstr
+ sym
->st_name
;
2835 add_elf_sym(s1
->dynsymtab_section
, sym
->st_value
, sym
->st_size
,
2836 sym
->st_info
, sym
->st_other
, sym
->st_shndx
, name
);
2839 /* load all referenced DLLs */
2840 for(i
= 0, dt
= dynamic
; i
< nb_dts
; i
++, dt
++) {
2843 name
= dynstr
+ dt
->d_un
.d_val
;
2844 for(j
= 0; j
< s1
->nb_loaded_dlls
; j
++) {
2845 dllref
= s1
->loaded_dlls
[j
];
2846 if (!strcmp(name
, dllref
->name
))
2847 goto already_loaded
;
2849 if (tcc_add_dll(s1
, name
, AFF_REFERENCED_DLL
) < 0) {
2850 tcc_error_noabort("referenced dll '%s' not found", name
);
2867 #define LD_TOK_NAME 256
2868 #define LD_TOK_EOF (-1)
2870 /* return next ld script token */
2871 static int ld_next(TCCState
*s1
, char *name
, int name_size
)
2889 file
->buf_ptr
= parse_comment(file
->buf_ptr
);
2890 ch
= file
->buf_ptr
[0];
2898 /* case 'a' ... 'z': */
2925 /* case 'A' ... 'z': */
2960 if (!((ch
>= 'a' && ch
<= 'z') ||
2961 (ch
>= 'A' && ch
<= 'Z') ||
2962 (ch
>= '0' && ch
<= '9') ||
2963 strchr("/.-_+=$:\\,~", ch
)))
2965 if ((q
- name
) < name_size
- 1) {
2984 static int ld_add_file(TCCState
*s1
, const char filename
[])
2988 ret
= tcc_add_file_internal(s1
, filename
, 0);
2990 ret
= tcc_add_dll(s1
, filename
, 0);
2994 static inline int new_undef_syms(void)
2997 ret
= new_undef_sym
;
3002 static int ld_add_file_list(TCCState
*s1
, const char *cmd
, int as_needed
)
3004 char filename
[1024], libname
[1024];
3005 int t
, group
, nblibs
= 0, ret
= 0;
3008 group
= !strcmp(cmd
, "GROUP");
3011 t
= ld_next(s1
, filename
, sizeof(filename
));
3014 t
= ld_next(s1
, filename
, sizeof(filename
));
3017 if (t
== LD_TOK_EOF
) {
3018 tcc_error_noabort("unexpected end of file");
3020 goto lib_parse_error
;
3021 } else if (t
== ')') {
3023 } else if (t
== '-') {
3024 t
= ld_next(s1
, filename
, sizeof(filename
));
3025 if ((t
!= LD_TOK_NAME
) || (filename
[0] != 'l')) {
3026 tcc_error_noabort("library name expected");
3028 goto lib_parse_error
;
3030 pstrcpy(libname
, sizeof libname
, &filename
[1]);
3031 if (s1
->static_link
) {
3032 snprintf(filename
, sizeof filename
, "lib%s.a", libname
);
3034 snprintf(filename
, sizeof filename
, "lib%s.so", libname
);
3036 } else if (t
!= LD_TOK_NAME
) {
3037 tcc_error_noabort("filename expected");
3039 goto lib_parse_error
;
3041 if (!strcmp(filename
, "AS_NEEDED")) {
3042 ret
= ld_add_file_list(s1
, cmd
, 1);
3044 goto lib_parse_error
;
3046 /* TODO: Implement AS_NEEDED support. Ignore it for now */
3048 ret
= ld_add_file(s1
, filename
);
3050 goto lib_parse_error
;
3052 /* Add the filename *and* the libname to avoid future conversions */
3053 dynarray_add((void ***) &libs
, &nblibs
, tcc_strdup(filename
));
3054 if (libname
[0] != '\0')
3055 dynarray_add((void ***) &libs
, &nblibs
, tcc_strdup(libname
));
3059 t
= ld_next(s1
, filename
, sizeof(filename
));
3061 t
= ld_next(s1
, filename
, sizeof(filename
));
3064 if (group
&& !as_needed
) {
3065 while (new_undef_syms()) {
3068 for (i
= 0; i
< nblibs
; i
++)
3069 ld_add_file(s1
, libs
[i
]);
3073 dynarray_reset(&libs
, &nblibs
);
3077 /* interpret a subset of GNU ldscripts to handle the dummy libc.so
3079 ST_FUNC
int tcc_load_ldscript(TCCState
*s1
)
3082 char filename
[1024];
3085 ch
= file
->buf_ptr
[0];
3088 t
= ld_next(s1
, cmd
, sizeof(cmd
));
3089 if (t
== LD_TOK_EOF
)
3091 else if (t
!= LD_TOK_NAME
)
3093 if (!strcmp(cmd
, "INPUT") ||
3094 !strcmp(cmd
, "GROUP")) {
3095 ret
= ld_add_file_list(s1
, cmd
, 0);
3098 } else if (!strcmp(cmd
, "OUTPUT_FORMAT") ||
3099 !strcmp(cmd
, "TARGET")) {
3100 /* ignore some commands */
3101 t
= ld_next(s1
, cmd
, sizeof(cmd
));
3105 t
= ld_next(s1
, filename
, sizeof(filename
));
3106 if (t
== LD_TOK_EOF
) {
3107 tcc_error_noabort("unexpected end of file");
3109 } else if (t
== ')') {
3119 #endif /* !TCC_TARGET_PE */