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);
1106 put32(p
+ 4, 0xe59fe010);
1107 put32(p
+ 8, 0xe08fe00e);
1108 put32(p
+ 12, 0xe5bef008);
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] // offset in GOT
1119 put32(p
+4, 0xe08fc00c); // add ip, pc, ip // absolute address or offset
1120 put32(p
+8, 0xe59cf000); // ldr pc, [ip] // load absolute address or load offset
1121 put32(p
+12, s1
->got
->data_offset
);
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
);
1843 printf("section: f=%08x t=%08x i=%08x %s %s\n",
1848 s
->reloc
? s
->reloc
->name
: "n"
1851 /* when generating a DLL, we include relocations but we may
1853 if (file_type
== TCC_OUTPUT_DLL
&&
1854 s
->sh_type
== SHT_RELX
&&
1855 !(s
->sh_flags
& SHF_ALLOC
)) {
1856 /* //gr: avoid bogus relocs for empty (debug) sections */
1857 if (s1
->sections
[s
->sh_info
]->sh_flags
& SHF_ALLOC
)
1858 prepare_dynamic_rel(s1
, s
);
1859 else if (s1
->do_debug
)
1860 s
->sh_size
= s
->data_offset
;
1861 } else if (s1
->do_debug
||
1862 file_type
== TCC_OUTPUT_OBJ
||
1863 (s
->sh_flags
& SHF_ALLOC
) ||
1864 i
== (s1
->nb_sections
- 1)) {
1865 /* we output all sections if debug or object file */
1866 s
->sh_size
= s
->data_offset
;
1870 /* allocate program segment headers */
1871 phdr
= tcc_mallocz(phnum
* sizeof(ElfW(Phdr
)));
1873 if (s1
->output_format
== TCC_OUTPUT_FORMAT_ELF
) {
1874 file_offset
= sizeof(ElfW(Ehdr
)) + phnum
* sizeof(ElfW(Phdr
));
1879 /* compute section to program header mapping */
1880 if (s1
->has_text_addr
) {
1881 int a_offset
, p_offset
;
1882 addr
= s1
->text_addr
;
1883 /* we ensure that (addr % ELF_PAGE_SIZE) == file_offset %
1885 a_offset
= (int) (addr
& (s1
->section_align
- 1));
1886 p_offset
= file_offset
& (s1
->section_align
- 1);
1887 if (a_offset
< p_offset
)
1888 a_offset
+= s1
->section_align
;
1889 file_offset
+= (a_offset
- p_offset
);
1891 if (file_type
== TCC_OUTPUT_DLL
)
1894 addr
= ELF_START_ADDR
;
1895 /* compute address after headers */
1896 addr
+= (file_offset
& (s1
->section_align
- 1));
1899 /* dynamic relocation table information, for .dynamic section */
1903 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1904 bss_addr
= bss_size
= 0;
1906 /* leave one program header for the program interpreter */
1909 ph
+= 1 + HAVE_PHDR
;
1911 for(j
= 0; j
< 2; j
++) {
1912 ph
->p_type
= PT_LOAD
;
1914 ph
->p_flags
= PF_R
| PF_X
;
1916 ph
->p_flags
= PF_R
| PF_W
;
1917 ph
->p_align
= s1
->section_align
;
1919 /* we do the following ordering: interp, symbol tables,
1920 relocations, progbits, nobits */
1921 /* XXX: do faster and simpler sorting */
1922 for(k
= 0; k
< 5; k
++) {
1923 for(i
= 1; i
< s1
->nb_sections
; i
++) {
1924 s
= s1
->sections
[i
];
1925 /* compute if section should be included */
1927 if ((s
->sh_flags
& (SHF_ALLOC
| SHF_WRITE
)) !=
1931 if ((s
->sh_flags
& (SHF_ALLOC
| SHF_WRITE
)) !=
1932 (SHF_ALLOC
| SHF_WRITE
))
1938 } else if (s
->sh_type
== SHT_DYNSYM
||
1939 s
->sh_type
== SHT_STRTAB
||
1940 s
->sh_type
== SHT_HASH
) {
1943 } else if (s
->sh_type
== SHT_RELX
) {
1946 } else if (s
->sh_type
== SHT_NOBITS
) {
1953 section_order
[sh_order_index
++] = i
;
1955 /* section matches: we align it and add its size */
1957 addr
= (addr
+ s
->sh_addralign
- 1) &
1958 ~(s
->sh_addralign
- 1);
1959 file_offset
+= (int) ( addr
- tmp
);
1960 s
->sh_offset
= file_offset
;
1963 /* update program header infos */
1964 if (ph
->p_offset
== 0) {
1965 ph
->p_offset
= file_offset
;
1967 ph
->p_paddr
= ph
->p_vaddr
;
1969 /* update dynamic relocation infos */
1970 if (s
->sh_type
== SHT_RELX
) {
1971 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1972 if (!strcmp(strsec
->data
+ s
->sh_name
, ".rel.got")) { // rel_size == 0) {
1974 rel_size
+= s
->sh_size
; // XXX only first rel.
1976 if (!strcmp(strsec
->data
+ s
->sh_name
, ".rel.bss")) { // rel_size == 0) {
1978 bss_size
= s
->sh_size
; // XXX only first rel.
1983 rel_size
+= s
->sh_size
;
1987 if (s
->sh_type
!= SHT_NOBITS
)
1988 file_offset
+= s
->sh_size
;
1991 ph
->p_filesz
= file_offset
- ph
->p_offset
;
1992 ph
->p_memsz
= addr
- ph
->p_vaddr
;
1995 if (s1
->output_format
== TCC_OUTPUT_FORMAT_ELF
) {
1996 /* if in the middle of a page, we duplicate the page in
1997 memory so that one copy is RX and the other is RW */
1998 if ((addr
& (s1
->section_align
- 1)) != 0)
1999 addr
+= s1
->section_align
;
2001 addr
= (addr
+ s1
->section_align
- 1) & ~(s1
->section_align
- 1);
2002 file_offset
= (file_offset
+ s1
->section_align
- 1) &
2003 ~(s1
->section_align
- 1);
2008 /* if interpreter, then add corresponing program header */
2012 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2014 int len
= phnum
* sizeof(ElfW(Phdr
));
2016 ph
->p_type
= PT_PHDR
;
2017 ph
->p_offset
= sizeof(ElfW(Ehdr
));
2018 ph
->p_vaddr
= interp
->sh_addr
- len
;
2019 ph
->p_paddr
= ph
->p_vaddr
;
2020 ph
->p_filesz
= ph
->p_memsz
= len
;
2021 ph
->p_flags
= PF_R
| PF_X
;
2022 ph
->p_align
= 4; // interp->sh_addralign;
2027 ph
->p_type
= PT_INTERP
;
2028 ph
->p_offset
= interp
->sh_offset
;
2029 ph
->p_vaddr
= interp
->sh_addr
;
2030 ph
->p_paddr
= ph
->p_vaddr
;
2031 ph
->p_filesz
= interp
->sh_size
;
2032 ph
->p_memsz
= interp
->sh_size
;
2034 ph
->p_align
= interp
->sh_addralign
;
2037 /* if dynamic section, then add corresponing program header */
2041 ph
= &phdr
[phnum
- 1];
2043 ph
->p_type
= PT_DYNAMIC
;
2044 ph
->p_offset
= dynamic
->sh_offset
;
2045 ph
->p_vaddr
= dynamic
->sh_addr
;
2046 ph
->p_paddr
= ph
->p_vaddr
;
2047 ph
->p_filesz
= dynamic
->sh_size
;
2048 ph
->p_memsz
= dynamic
->sh_size
;
2049 ph
->p_flags
= PF_R
| PF_W
;
2050 ph
->p_align
= dynamic
->sh_addralign
;
2052 /* put GOT dynamic section address */
2053 put32(s1
->got
->data
, dynamic
->sh_addr
);
2055 /* relocate the PLT */
2056 if (file_type
== TCC_OUTPUT_EXE
2057 #if defined(TCC_OUTPUT_DLL_WITH_PLT)
2058 || file_type
== TCC_OUTPUT_DLL
2064 p_end
= p
+ s1
->plt
->data_offset
;
2066 #if defined(TCC_TARGET_I386)
2067 put32(p
+ 2, get32(p
+ 2) + s1
->got
->sh_addr
);
2068 put32(p
+ 8, get32(p
+ 8) + s1
->got
->sh_addr
);
2071 put32(p
+ 2, get32(p
+ 2) + s1
->got
->sh_addr
);
2074 #elif defined(TCC_TARGET_X86_64)
2075 int x
= s1
->got
->sh_addr
- s1
->plt
->sh_addr
- 6;
2076 put32(p
+ 2, get32(p
+ 2) + x
);
2077 put32(p
+ 8, get32(p
+ 8) + x
- 6);
2080 put32(p
+ 2, get32(p
+ 2) + x
+ s1
->plt
->data
- p
);
2083 #elif defined(TCC_TARGET_ARM)
2085 x
=s1
->got
->sh_addr
- s1
->plt
->sh_addr
- 12;
2088 if (get32(p
) == 0x46c04778) /* PLT Thumb stub present */
2090 put32(p
+ 12, x
+ get32(p
+ 12) + s1
->plt
->data
- p
);
2093 #elif defined(TCC_TARGET_C67)
2096 #error unsupported CPU
2101 /* relocate symbols in .dynsym */
2102 sym_end
= (ElfW(Sym
) *)(s1
->dynsym
->data
+ s1
->dynsym
->data_offset
);
2103 for(sym
= (ElfW(Sym
) *)s1
->dynsym
->data
+ 1;
2106 if (sym
->st_shndx
== SHN_UNDEF
) {
2107 /* relocate to the PLT if the symbol corresponds
2110 sym
->st_value
+= s1
->plt
->sh_addr
;
2111 } else if (sym
->st_shndx
< SHN_LORESERVE
) {
2112 /* do symbol relocation */
2113 sym
->st_value
+= s1
->sections
[sym
->st_shndx
]->sh_addr
;
2117 /* put dynamic section entries */
2118 dynamic
->data_offset
= saved_dynamic_data_offset
;
2119 put_dt(dynamic
, DT_HASH
, s1
->dynsym
->hash
->sh_addr
);
2120 put_dt(dynamic
, DT_STRTAB
, dynstr
->sh_addr
);
2121 put_dt(dynamic
, DT_SYMTAB
, s1
->dynsym
->sh_addr
);
2122 put_dt(dynamic
, DT_STRSZ
, dynstr
->data_offset
);
2123 put_dt(dynamic
, DT_SYMENT
, sizeof(ElfW(Sym
)));
2124 #ifdef TCC_TARGET_X86_64
2125 put_dt(dynamic
, DT_RELA
, rel_addr
);
2126 put_dt(dynamic
, DT_RELASZ
, rel_size
);
2127 put_dt(dynamic
, DT_RELAENT
, sizeof(ElfW_Rel
));
2129 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2130 put_dt(dynamic
, DT_PLTGOT
, s1
->got
->sh_addr
);
2131 put_dt(dynamic
, DT_PLTRELSZ
, rel_size
);
2132 put_dt(dynamic
, DT_JMPREL
, rel_addr
);
2133 put_dt(dynamic
, DT_PLTREL
, DT_REL
);
2134 put_dt(dynamic
, DT_REL
, bss_addr
);
2135 put_dt(dynamic
, DT_RELSZ
, bss_size
);
2137 put_dt(dynamic
, DT_REL
, rel_addr
);
2138 put_dt(dynamic
, DT_RELSZ
, rel_size
);
2139 put_dt(dynamic
, DT_RELENT
, sizeof(ElfW_Rel
));
2143 put_dt(dynamic
, DT_DEBUG
, 0);
2144 put_dt(dynamic
, DT_NULL
, 0);
2147 ehdr
.e_phentsize
= sizeof(ElfW(Phdr
));
2148 ehdr
.e_phnum
= phnum
;
2149 ehdr
.e_phoff
= sizeof(ElfW(Ehdr
));
2152 /* all other sections come after */
2153 for(i
= 1; i
< s1
->nb_sections
; i
++) {
2154 s
= s1
->sections
[i
];
2155 if (phnum
> 0 && (s
->sh_flags
& SHF_ALLOC
))
2157 section_order
[sh_order_index
++] = i
;
2159 file_offset
= (file_offset
+ s
->sh_addralign
- 1) &
2160 ~(s
->sh_addralign
- 1);
2161 s
->sh_offset
= file_offset
;
2162 if (s
->sh_type
!= SHT_NOBITS
)
2163 file_offset
+= s
->sh_size
;
2166 /* if building executable or DLL, then relocate each section
2167 except the GOT which is already relocated */
2168 if (file_type
!= TCC_OUTPUT_OBJ
) {
2169 relocate_syms(s1
, 0);
2171 if (s1
->nb_errors
!= 0) {
2177 /* relocate sections */
2178 /* XXX: ignore sections with allocated relocations ? */
2179 for(i
= 1; i
< s1
->nb_sections
; i
++) {
2180 s
= s1
->sections
[i
];
2181 if (s
->reloc
&& s
!= s1
->got
)
2182 relocate_section(s1
, s
);
2185 /* relocate relocation entries if the relocation tables are
2186 allocated in the executable */
2187 for(i
= 1; i
< s1
->nb_sections
; i
++) {
2188 s
= s1
->sections
[i
];
2189 if ((s
->sh_flags
& SHF_ALLOC
) &&
2190 s
->sh_type
== SHT_RELX
) {
2191 relocate_rel(s1
, s
);
2195 /* get entry point address */
2196 if (file_type
== TCC_OUTPUT_EXE
)
2197 ehdr
.e_entry
= get_elf_sym_addr(s1
, "_start", 1);
2199 ehdr
.e_entry
= text_section
->sh_addr
; /* XXX: is it correct ? */
2201 if (file_type
== TCC_OUTPUT_EXE
&& s1
->static_link
)
2204 /* write elf file */
2205 if (file_type
== TCC_OUTPUT_OBJ
)
2210 fd
= open(filename
, O_WRONLY
| O_CREAT
| O_TRUNC
| O_BINARY
, mode
);
2212 tcc_error_noabort("could not write '%s'", filename
);
2215 f
= fdopen(fd
, "wb");
2217 printf("<- %s\n", filename
);
2219 #ifdef TCC_TARGET_COFF
2220 if (s1
->output_format
== TCC_OUTPUT_FORMAT_COFF
) {
2221 tcc_output_coff(s1
, f
);
2224 if (s1
->output_format
== TCC_OUTPUT_FORMAT_ELF
) {
2225 sort_syms(s1
, symtab_section
);
2228 file_offset
= (file_offset
+ 3) & -4;
2231 ehdr
.e_ident
[0] = ELFMAG0
;
2232 ehdr
.e_ident
[1] = ELFMAG1
;
2233 ehdr
.e_ident
[2] = ELFMAG2
;
2234 ehdr
.e_ident
[3] = ELFMAG3
;
2235 ehdr
.e_ident
[4] = ELFCLASSW
;
2236 ehdr
.e_ident
[5] = ELFDATA2LSB
;
2237 ehdr
.e_ident
[6] = EV_CURRENT
;
2238 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
2239 ehdr
.e_ident
[EI_OSABI
] = ELFOSABI_FREEBSD
;
2241 #ifdef TCC_TARGET_ARM
2243 ehdr
.e_ident
[EI_OSABI
] = 0;
2244 ehdr
.e_flags
= EF_ARM_EABI_VER4
;
2245 if (file_type
== TCC_OUTPUT_EXE
|| file_type
== TCC_OUTPUT_DLL
)
2246 ehdr
.e_flags
|= EF_ARM_HASENTRY
;
2247 if (s1
->float_abi
== ARM_HARD_FLOAT
)
2248 ehdr
.e_flags
|= EF_ARM_VFP_FLOAT
;
2250 ehdr
.e_flags
|= EF_ARM_SOFT_FLOAT
;
2252 ehdr
.e_ident
[EI_OSABI
] = ELFOSABI_ARM
;
2257 case TCC_OUTPUT_EXE
:
2258 ehdr
.e_type
= ET_EXEC
;
2260 case TCC_OUTPUT_DLL
:
2261 ehdr
.e_type
= ET_DYN
;
2263 case TCC_OUTPUT_OBJ
:
2264 ehdr
.e_type
= ET_REL
;
2267 ehdr
.e_machine
= EM_TCC_TARGET
;
2268 ehdr
.e_version
= EV_CURRENT
;
2269 ehdr
.e_shoff
= file_offset
;
2270 ehdr
.e_ehsize
= sizeof(ElfW(Ehdr
));
2271 ehdr
.e_shentsize
= sizeof(ElfW(Shdr
));
2272 ehdr
.e_shnum
= shnum
;
2273 ehdr
.e_shstrndx
= shnum
- 1;
2275 fwrite(&ehdr
, 1, sizeof(ElfW(Ehdr
)), f
);
2276 fwrite(phdr
, 1, phnum
* sizeof(ElfW(Phdr
)), f
);
2277 offset
= sizeof(ElfW(Ehdr
)) + phnum
* sizeof(ElfW(Phdr
));
2279 for(i
=1;i
<s1
->nb_sections
;i
++) {
2280 s
= s1
->sections
[section_order
[i
]];
2281 if (s
->sh_type
!= SHT_NOBITS
) {
2282 if (s
->sh_type
== SHT_DYNSYM
)
2283 patch_dynsym_undef(s1
, s
);
2284 while (offset
< s
->sh_offset
) {
2289 fwrite(s
->data
, 1, size
, f
);
2294 /* output section headers */
2295 while (offset
< ehdr
.e_shoff
) {
2300 for(i
=0;i
<s1
->nb_sections
;i
++) {
2302 memset(sh
, 0, sizeof(ElfW(Shdr
)));
2303 s
= s1
->sections
[i
];
2305 sh
->sh_name
= s
->sh_name
;
2306 sh
->sh_type
= s
->sh_type
;
2307 sh
->sh_flags
= s
->sh_flags
;
2308 sh
->sh_entsize
= s
->sh_entsize
;
2309 sh
->sh_info
= s
->sh_info
;
2311 sh
->sh_link
= s
->link
->sh_num
;
2312 sh
->sh_addralign
= s
->sh_addralign
;
2313 sh
->sh_addr
= s
->sh_addr
;
2314 sh
->sh_offset
= s
->sh_offset
;
2315 sh
->sh_size
= s
->sh_size
;
2317 fwrite(sh
, 1, sizeof(ElfW(Shdr
)), f
);
2320 tcc_output_binary(s1
, f
, section_order
);
2326 tcc_free(s1
->symtab_to_dynsym
);
2327 tcc_free(section_order
);
2329 tcc_free(s1
->sym_attrs
);
2333 LIBTCCAPI
int tcc_output_file(TCCState
*s
, const char *filename
)
2336 #ifdef TCC_TARGET_PE
2337 if (s
->output_type
!= TCC_OUTPUT_OBJ
) {
2338 ret
= pe_output_file(s
, filename
);
2342 ret
= elf_output_file(s
, filename
);
2347 static void *load_data(int fd
, unsigned long file_offset
, unsigned long size
)
2351 data
= tcc_malloc(size
);
2352 lseek(fd
, file_offset
, SEEK_SET
);
2353 read(fd
, data
, size
);
2357 typedef struct SectionMergeInfo
{
2358 Section
*s
; /* corresponding existing section */
2359 unsigned long offset
; /* offset of the new section in the existing section */
2360 uint8_t new_section
; /* true if section 's' was added */
2361 uint8_t link_once
; /* true if link once section */
2364 /* load an object file and merge it with current files */
2365 /* XXX: handle correctly stab (debug) info */
2366 ST_FUNC
int tcc_load_object_file(TCCState
*s1
,
2367 int fd
, unsigned long file_offset
)
2370 ElfW(Shdr
) *shdr
, *sh
;
2371 int size
, i
, j
, offset
, offseti
, nb_syms
, sym_index
, ret
;
2372 unsigned char *strsec
, *strtab
;
2373 int *old_to_new_syms
;
2374 char *sh_name
, *name
;
2375 SectionMergeInfo
*sm_table
, *sm
;
2376 ElfW(Sym
) *sym
, *symtab
;
2377 ElfW_Rel
*rel
, *rel_end
;
2383 stab_index
= stabstr_index
= 0;
2385 if (read(fd
, &ehdr
, sizeof(ehdr
)) != sizeof(ehdr
))
2387 if (ehdr
.e_ident
[0] != ELFMAG0
||
2388 ehdr
.e_ident
[1] != ELFMAG1
||
2389 ehdr
.e_ident
[2] != ELFMAG2
||
2390 ehdr
.e_ident
[3] != ELFMAG3
)
2392 /* test if object file */
2393 if (ehdr
.e_type
!= ET_REL
)
2395 /* test CPU specific stuff */
2396 if (ehdr
.e_ident
[5] != ELFDATA2LSB
||
2397 ehdr
.e_machine
!= EM_TCC_TARGET
) {
2399 tcc_error_noabort("invalid object file");
2403 shdr
= load_data(fd
, file_offset
+ ehdr
.e_shoff
,
2404 sizeof(ElfW(Shdr
)) * ehdr
.e_shnum
);
2405 sm_table
= tcc_mallocz(sizeof(SectionMergeInfo
) * ehdr
.e_shnum
);
2407 /* load section names */
2408 sh
= &shdr
[ehdr
.e_shstrndx
];
2409 strsec
= load_data(fd
, file_offset
+ sh
->sh_offset
, sh
->sh_size
);
2411 /* load symtab and strtab */
2412 old_to_new_syms
= NULL
;
2416 for(i
= 1; i
< ehdr
.e_shnum
; i
++) {
2418 if (sh
->sh_type
== SHT_SYMTAB
) {
2420 tcc_error_noabort("object must contain only one symtab");
2425 nb_syms
= sh
->sh_size
/ sizeof(ElfW(Sym
));
2426 symtab
= load_data(fd
, file_offset
+ sh
->sh_offset
, sh
->sh_size
);
2427 sm_table
[i
].s
= symtab_section
;
2429 /* now load strtab */
2430 sh
= &shdr
[sh
->sh_link
];
2431 strtab
= load_data(fd
, file_offset
+ sh
->sh_offset
, sh
->sh_size
);
2435 /* now examine each section and try to merge its content with the
2437 for(i
= 1; i
< ehdr
.e_shnum
; i
++) {
2438 /* no need to examine section name strtab */
2439 if (i
== ehdr
.e_shstrndx
)
2442 sh_name
= strsec
+ sh
->sh_name
;
2443 /* ignore sections types we do not handle */
2444 if (sh
->sh_type
!= SHT_PROGBITS
&&
2445 sh
->sh_type
!= SHT_RELX
&&
2447 sh
->sh_type
!= SHT_ARM_EXIDX
&&
2449 sh
->sh_type
!= SHT_NOBITS
&&
2450 sh
->sh_type
!= SHT_PREINIT_ARRAY
&&
2451 sh
->sh_type
!= SHT_INIT_ARRAY
&&
2452 sh
->sh_type
!= SHT_FINI_ARRAY
&&
2453 strcmp(sh_name
, ".stabstr")
2456 if (sh
->sh_addralign
< 1)
2457 sh
->sh_addralign
= 1;
2458 /* find corresponding section, if any */
2459 for(j
= 1; j
< s1
->nb_sections
;j
++) {
2460 s
= s1
->sections
[j
];
2461 if (!strcmp(s
->name
, sh_name
)) {
2462 if (!strncmp(sh_name
, ".gnu.linkonce",
2463 sizeof(".gnu.linkonce") - 1)) {
2464 /* if a 'linkonce' section is already present, we
2465 do not add it again. It is a little tricky as
2466 symbols can still be defined in
2468 sm_table
[i
].link_once
= 1;
2475 /* not found: create new section */
2476 s
= new_section(s1
, sh_name
, sh
->sh_type
, sh
->sh_flags
);
2477 /* take as much info as possible from the section. sh_link and
2478 sh_info will be updated later */
2479 s
->sh_addralign
= sh
->sh_addralign
;
2480 s
->sh_entsize
= sh
->sh_entsize
;
2481 sm_table
[i
].new_section
= 1;
2483 if (sh
->sh_type
!= s
->sh_type
) {
2484 tcc_error_noabort("invalid section type");
2488 /* align start of section */
2489 offset
= s
->data_offset
;
2491 if (0 == strcmp(sh_name
, ".stab")) {
2495 if (0 == strcmp(sh_name
, ".stabstr")) {
2500 size
= sh
->sh_addralign
- 1;
2501 offset
= (offset
+ size
) & ~size
;
2502 if (sh
->sh_addralign
> s
->sh_addralign
)
2503 s
->sh_addralign
= sh
->sh_addralign
;
2504 s
->data_offset
= offset
;
2506 sm_table
[i
].offset
= offset
;
2508 /* concatenate sections */
2510 if (sh
->sh_type
!= SHT_NOBITS
) {
2512 lseek(fd
, file_offset
+ sh
->sh_offset
, SEEK_SET
);
2513 ptr
= section_ptr_add(s
, size
);
2514 read(fd
, ptr
, size
);
2516 s
->data_offset
+= size
;
2521 /* //gr relocate stab strings */
2522 if (stab_index
&& stabstr_index
) {
2525 s
= sm_table
[stab_index
].s
;
2526 a
= (Stab_Sym
*)(s
->data
+ sm_table
[stab_index
].offset
);
2527 b
= (Stab_Sym
*)(s
->data
+ s
->data_offset
);
2528 o
= sm_table
[stabstr_index
].offset
;
2530 a
->n_strx
+= o
, a
++;
2533 /* second short pass to update sh_link and sh_info fields of new
2535 for(i
= 1; i
< ehdr
.e_shnum
; i
++) {
2537 if (!s
|| !sm_table
[i
].new_section
)
2540 if (sh
->sh_link
> 0)
2541 s
->link
= sm_table
[sh
->sh_link
].s
;
2542 if (sh
->sh_type
== SHT_RELX
) {
2543 s
->sh_info
= sm_table
[sh
->sh_info
].s
->sh_num
;
2544 /* update backward link */
2545 s1
->sections
[s
->sh_info
]->reloc
= s
;
2550 /* resolve symbols */
2551 old_to_new_syms
= tcc_mallocz(nb_syms
* sizeof(int));
2554 for(i
= 1; i
< nb_syms
; i
++, sym
++) {
2555 if (sym
->st_shndx
!= SHN_UNDEF
&&
2556 sym
->st_shndx
< SHN_LORESERVE
) {
2557 sm
= &sm_table
[sym
->st_shndx
];
2558 if (sm
->link_once
) {
2559 /* if a symbol is in a link once section, we use the
2560 already defined symbol. It is very important to get
2561 correct relocations */
2562 if (ELFW(ST_BIND
)(sym
->st_info
) != STB_LOCAL
) {
2563 name
= strtab
+ sym
->st_name
;
2564 sym_index
= find_elf_sym(symtab_section
, name
);
2566 old_to_new_syms
[i
] = sym_index
;
2570 /* if no corresponding section added, no need to add symbol */
2573 /* convert section number */
2574 sym
->st_shndx
= sm
->s
->sh_num
;
2576 sym
->st_value
+= sm
->offset
;
2579 name
= strtab
+ sym
->st_name
;
2580 sym_index
= add_elf_sym(symtab_section
, sym
->st_value
, sym
->st_size
,
2581 sym
->st_info
, sym
->st_other
,
2582 sym
->st_shndx
, name
);
2583 old_to_new_syms
[i
] = sym_index
;
2586 /* third pass to patch relocation entries */
2587 for(i
= 1; i
< ehdr
.e_shnum
; i
++) {
2592 offset
= sm_table
[i
].offset
;
2593 switch(s
->sh_type
) {
2595 /* take relocation offset information */
2596 offseti
= sm_table
[sh
->sh_info
].offset
;
2597 rel_end
= (ElfW_Rel
*)(s
->data
+ s
->data_offset
);
2598 for(rel
= (ElfW_Rel
*)(s
->data
+ offset
);
2603 /* convert symbol index */
2604 type
= ELFW(R_TYPE
)(rel
->r_info
);
2605 sym_index
= ELFW(R_SYM
)(rel
->r_info
);
2606 /* NOTE: only one symtab assumed */
2607 if (sym_index
>= nb_syms
)
2609 sym_index
= old_to_new_syms
[sym_index
];
2610 /* ignore link_once in rel section. */
2611 if (!sym_index
&& !sm
->link_once
2612 #ifdef TCC_TARGET_ARM
2613 && type
!= R_ARM_V4BX
2617 tcc_error_noabort("Invalid relocation entry [%2d] '%s' @ %.8x",
2618 i
, strsec
+ sh
->sh_name
, rel
->r_offset
);
2621 rel
->r_info
= ELFW(R_INFO
)(sym_index
, type
);
2622 /* offset the relocation offset */
2623 rel
->r_offset
+= offseti
;
2624 #ifdef TCC_TARGET_ARM
2625 /* Jumps and branches from a Thumb code to a PLT entry need
2626 special handling since PLT entries are ARM code.
2627 Unconditional bl instructions referencing PLT entries are
2628 handled by converting these instructions into blx
2629 instructions. Other case of instructions referencing a PLT
2630 entry require to add a Thumb stub before the PLT entry to
2631 switch to ARM mode. We set bit 0 of the got offset of a
2632 symbol to indicate such a case. */
2633 if (type
== R_ARM_THM_JUMP24
)
2634 alloc_sym_attr(s1
, sym_index
)->plt_thumb_stub
= 1;
2647 tcc_free(old_to_new_syms
);
2654 typedef struct ArchiveHeader
{
2655 char ar_name
[16]; /* name of this member */
2656 char ar_date
[12]; /* file mtime */
2657 char ar_uid
[6]; /* owner uid; printed as decimal */
2658 char ar_gid
[6]; /* owner gid; printed as decimal */
2659 char ar_mode
[8]; /* file mode, printed as octal */
2660 char ar_size
[10]; /* file size, printed as decimal */
2661 char ar_fmag
[2]; /* should contain ARFMAG */
2664 static int get_be32(const uint8_t *b
)
2666 return b
[3] | (b
[2] << 8) | (b
[1] << 16) | (b
[0] << 24);
2669 /* load only the objects which resolve undefined symbols */
2670 static int tcc_load_alacarte(TCCState
*s1
, int fd
, int size
)
2672 int i
, bound
, nsyms
, sym_index
, off
, ret
;
2674 const char *ar_names
, *p
;
2675 const uint8_t *ar_index
;
2678 data
= tcc_malloc(size
);
2679 if (read(fd
, data
, size
) != size
)
2681 nsyms
= get_be32(data
);
2682 ar_index
= data
+ 4;
2683 ar_names
= ar_index
+ nsyms
* 4;
2687 for(p
= ar_names
, i
= 0; i
< nsyms
; i
++, p
+= strlen(p
)+1) {
2688 sym_index
= find_elf_sym(symtab_section
, p
);
2690 sym
= &((ElfW(Sym
) *)symtab_section
->data
)[sym_index
];
2691 if(sym
->st_shndx
== SHN_UNDEF
) {
2692 off
= get_be32(ar_index
+ i
* 4) + sizeof(ArchiveHeader
);
2694 printf("%5d\t%s\t%08x\n", i
, p
, sym
->st_shndx
);
2697 lseek(fd
, off
, SEEK_SET
);
2698 if(tcc_load_object_file(s1
, fd
, off
) < 0) {
2713 /* load a '.a' file */
2714 ST_FUNC
int tcc_load_archive(TCCState
*s1
, int fd
)
2721 unsigned long file_offset
;
2723 /* skip magic which was already checked */
2724 read(fd
, magic
, sizeof(magic
));
2727 len
= read(fd
, &hdr
, sizeof(hdr
));
2730 if (len
!= sizeof(hdr
)) {
2731 tcc_error_noabort("invalid archive");
2734 memcpy(ar_size
, hdr
.ar_size
, sizeof(hdr
.ar_size
));
2735 ar_size
[sizeof(hdr
.ar_size
)] = '\0';
2736 size
= strtol(ar_size
, NULL
, 0);
2737 memcpy(ar_name
, hdr
.ar_name
, sizeof(hdr
.ar_name
));
2738 for(i
= sizeof(hdr
.ar_name
) - 1; i
>= 0; i
--) {
2739 if (ar_name
[i
] != ' ')
2742 ar_name
[i
+ 1] = '\0';
2743 // printf("name='%s' size=%d %s\n", ar_name, size, ar_size);
2744 file_offset
= lseek(fd
, 0, SEEK_CUR
);
2746 size
= (size
+ 1) & ~1;
2747 if (!strcmp(ar_name
, "/")) {
2748 /* coff symbol table : we handle it */
2749 if(s1
->alacarte_link
)
2750 return tcc_load_alacarte(s1
, fd
, size
);
2751 } else if (!strcmp(ar_name
, "//") ||
2752 !strcmp(ar_name
, "__.SYMDEF") ||
2753 !strcmp(ar_name
, "__.SYMDEF/") ||
2754 !strcmp(ar_name
, "ARFILENAMES/")) {
2755 /* skip symbol table or archive names */
2757 if (tcc_load_object_file(s1
, fd
, file_offset
) < 0)
2760 lseek(fd
, file_offset
+ size
, SEEK_SET
);
2765 #ifndef TCC_TARGET_PE
2766 /* load a DLL and all referenced DLLs. 'level = 0' means that the DLL
2767 is referenced by the user (so it should be added as DT_NEEDED in
2768 the generated ELF file) */
2769 ST_FUNC
int tcc_load_dll(TCCState
*s1
, int fd
, const char *filename
, int level
)
2772 ElfW(Shdr
) *shdr
, *sh
, *sh1
;
2773 int i
, j
, nb_syms
, nb_dts
, sym_bind
, ret
;
2774 ElfW(Sym
) *sym
, *dynsym
;
2775 ElfW(Dyn
) *dt
, *dynamic
;
2776 unsigned char *dynstr
;
2777 const char *name
, *soname
;
2778 DLLReference
*dllref
;
2780 read(fd
, &ehdr
, sizeof(ehdr
));
2782 /* test CPU specific stuff */
2783 if (ehdr
.e_ident
[5] != ELFDATA2LSB
||
2784 ehdr
.e_machine
!= EM_TCC_TARGET
) {
2785 tcc_error_noabort("bad architecture");
2790 shdr
= load_data(fd
, ehdr
.e_shoff
, sizeof(ElfW(Shdr
)) * ehdr
.e_shnum
);
2792 /* load dynamic section and dynamic symbols */
2796 dynsym
= NULL
; /* avoid warning */
2797 dynstr
= NULL
; /* avoid warning */
2798 for(i
= 0, sh
= shdr
; i
< ehdr
.e_shnum
; i
++, sh
++) {
2799 switch(sh
->sh_type
) {
2801 nb_dts
= sh
->sh_size
/ sizeof(ElfW(Dyn
));
2802 dynamic
= load_data(fd
, sh
->sh_offset
, sh
->sh_size
);
2805 nb_syms
= sh
->sh_size
/ sizeof(ElfW(Sym
));
2806 dynsym
= load_data(fd
, sh
->sh_offset
, sh
->sh_size
);
2807 sh1
= &shdr
[sh
->sh_link
];
2808 dynstr
= load_data(fd
, sh1
->sh_offset
, sh1
->sh_size
);
2815 /* compute the real library name */
2816 soname
= tcc_basename(filename
);
2818 for(i
= 0, dt
= dynamic
; i
< nb_dts
; i
++, dt
++) {
2819 if (dt
->d_tag
== DT_SONAME
) {
2820 soname
= dynstr
+ dt
->d_un
.d_val
;
2824 /* if the dll is already loaded, do not load it */
2825 for(i
= 0; i
< s1
->nb_loaded_dlls
; i
++) {
2826 dllref
= s1
->loaded_dlls
[i
];
2827 if (!strcmp(soname
, dllref
->name
)) {
2828 /* but update level if needed */
2829 if (level
< dllref
->level
)
2830 dllref
->level
= level
;
2836 // printf("loading dll '%s'\n", soname);
2838 /* add the dll and its level */
2839 dllref
= tcc_mallocz(sizeof(DLLReference
) + strlen(soname
));
2840 dllref
->level
= level
;
2841 strcpy(dllref
->name
, soname
);
2842 dynarray_add((void ***)&s1
->loaded_dlls
, &s1
->nb_loaded_dlls
, dllref
);
2844 /* add dynamic symbols in dynsym_section */
2845 for(i
= 1, sym
= dynsym
+ 1; i
< nb_syms
; i
++, sym
++) {
2846 sym_bind
= ELFW(ST_BIND
)(sym
->st_info
);
2847 if (sym_bind
== STB_LOCAL
)
2849 name
= dynstr
+ sym
->st_name
;
2850 add_elf_sym(s1
->dynsymtab_section
, sym
->st_value
, sym
->st_size
,
2851 sym
->st_info
, sym
->st_other
, sym
->st_shndx
, name
);
2854 /* load all referenced DLLs */
2855 for(i
= 0, dt
= dynamic
; i
< nb_dts
; i
++, dt
++) {
2858 name
= dynstr
+ dt
->d_un
.d_val
;
2859 for(j
= 0; j
< s1
->nb_loaded_dlls
; j
++) {
2860 dllref
= s1
->loaded_dlls
[j
];
2861 if (!strcmp(name
, dllref
->name
))
2862 goto already_loaded
;
2864 if (tcc_add_dll(s1
, name
, AFF_REFERENCED_DLL
) < 0) {
2865 tcc_error_noabort("referenced dll '%s' not found", name
);
2882 #define LD_TOK_NAME 256
2883 #define LD_TOK_EOF (-1)
2885 /* return next ld script token */
2886 static int ld_next(TCCState
*s1
, char *name
, int name_size
)
2904 file
->buf_ptr
= parse_comment(file
->buf_ptr
);
2905 ch
= file
->buf_ptr
[0];
2913 /* case 'a' ... 'z': */
2940 /* case 'A' ... 'z': */
2975 if (!((ch
>= 'a' && ch
<= 'z') ||
2976 (ch
>= 'A' && ch
<= 'Z') ||
2977 (ch
>= '0' && ch
<= '9') ||
2978 strchr("/.-_+=$:\\,~", ch
)))
2980 if ((q
- name
) < name_size
- 1) {
2997 printf("tok=%c %d\n", c
, c
);
2998 if (c
== LD_TOK_NAME
)
2999 printf(" name=%s\n", name
);
3004 static int ld_add_file(TCCState
*s1
, const char filename
[])
3008 ret
= tcc_add_file_internal(s1
, filename
, 0);
3010 ret
= tcc_add_dll(s1
, filename
, 0);
3014 static inline int new_undef_syms(void)
3017 ret
= new_undef_sym
;
3022 static int ld_add_file_list(TCCState
*s1
, const char *cmd
, int as_needed
)
3024 char filename
[1024], libname
[1024];
3025 int t
, group
, nblibs
= 0, ret
= 0;
3028 group
= !strcmp(cmd
, "GROUP");
3031 t
= ld_next(s1
, filename
, sizeof(filename
));
3034 t
= ld_next(s1
, filename
, sizeof(filename
));
3037 if (t
== LD_TOK_EOF
) {
3038 tcc_error_noabort("unexpected end of file");
3040 goto lib_parse_error
;
3041 } else if (t
== ')') {
3043 } else if (t
== '-') {
3044 t
= ld_next(s1
, filename
, sizeof(filename
));
3045 if ((t
!= LD_TOK_NAME
) || (filename
[0] != 'l')) {
3046 tcc_error_noabort("library name expected");
3048 goto lib_parse_error
;
3050 pstrcpy(libname
, sizeof libname
, &filename
[1]);
3051 if (s1
->static_link
) {
3052 snprintf(filename
, sizeof filename
, "lib%s.a", libname
);
3054 snprintf(filename
, sizeof filename
, "lib%s.so", libname
);
3056 } else if (t
!= LD_TOK_NAME
) {
3057 tcc_error_noabort("filename expected");
3059 goto lib_parse_error
;
3061 if (!strcmp(filename
, "AS_NEEDED")) {
3062 ret
= ld_add_file_list(s1
, cmd
, 1);
3064 goto lib_parse_error
;
3066 /* TODO: Implement AS_NEEDED support. Ignore it for now */
3068 ret
= ld_add_file(s1
, filename
);
3070 goto lib_parse_error
;
3072 /* Add the filename *and* the libname to avoid future conversions */
3073 dynarray_add((void ***) &libs
, &nblibs
, tcc_strdup(filename
));
3074 if (libname
[0] != '\0')
3075 dynarray_add((void ***) &libs
, &nblibs
, tcc_strdup(libname
));
3079 t
= ld_next(s1
, filename
, sizeof(filename
));
3081 t
= ld_next(s1
, filename
, sizeof(filename
));
3084 if (group
&& !as_needed
) {
3085 while (new_undef_syms()) {
3088 for (i
= 0; i
< nblibs
; i
++)
3089 ld_add_file(s1
, libs
[i
]);
3093 dynarray_reset(&libs
, &nblibs
);
3097 /* interpret a subset of GNU ldscripts to handle the dummy libc.so
3099 ST_FUNC
int tcc_load_ldscript(TCCState
*s1
)
3102 char filename
[1024];
3105 ch
= file
->buf_ptr
[0];
3108 t
= ld_next(s1
, cmd
, sizeof(cmd
));
3109 if (t
== LD_TOK_EOF
)
3111 else if (t
!= LD_TOK_NAME
)
3113 if (!strcmp(cmd
, "INPUT") ||
3114 !strcmp(cmd
, "GROUP")) {
3115 ret
= ld_add_file_list(s1
, cmd
, 0);
3118 } else if (!strcmp(cmd
, "OUTPUT_FORMAT") ||
3119 !strcmp(cmd
, "TARGET")) {
3120 /* ignore some commands */
3121 t
= ld_next(s1
, cmd
, sizeof(cmd
));
3125 t
= ld_next(s1
, filename
, sizeof(filename
));
3126 if (t
== LD_TOK_EOF
) {
3127 tcc_error_noabort("unexpected end of file");
3129 } else if (t
== ')') {
3139 #endif /* ndef TCC_TARGET_PE */