1 /* Machine-dependent ELF dynamic relocation inline functions. i386 version.
2 Copyright (C) 1995-2020 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
22 #define ELF_MACHINE_NAME "i386"
24 #include <sys/param.h>
27 #include <dl-tlsdesc.h>
28 #include <cpu-features.c>
30 /* Return nonzero iff ELF header is compatible with the running host. */
31 static inline int __attribute__ ((unused
))
32 elf_machine_matches_host (const Elf32_Ehdr
*ehdr
)
34 return ehdr
->e_machine
== EM_386
;
38 /* Return the link-time address of _DYNAMIC. Conveniently, this is the
39 first element of the GOT, a special entry that is never relocated. */
40 static inline Elf32_Addr
__attribute__ ((unused
, const))
41 elf_machine_dynamic (void)
43 /* This produces a GOTOFF reloc that resolves to zero at link time, so in
44 fact just loads from the GOT register directly. By doing it without
45 an asm we can let the compiler choose any register. */
46 extern const Elf32_Addr _GLOBAL_OFFSET_TABLE_
[] attribute_hidden
;
47 return _GLOBAL_OFFSET_TABLE_
[0];
50 /* Return the run-time load address of the shared object. */
51 static inline Elf32_Addr
__attribute__ ((unused
))
52 elf_machine_load_address (void)
54 /* Compute the difference between the runtime address of _DYNAMIC as seen
55 by a GOTOFF reference, and the link-time address found in the special
56 unrelocated first GOT entry. */
57 extern Elf32_Dyn bygotoff
[] asm ("_DYNAMIC") attribute_hidden
;
58 return (Elf32_Addr
) &bygotoff
- elf_machine_dynamic ();
61 /* Set up the loaded object described by L so its unrelocated PLT
62 entries will jump to the on-demand fixup code in dl-runtime.c. */
64 static inline int __attribute__ ((unused
, always_inline
))
65 elf_machine_runtime_setup (struct link_map
*l
, int lazy
, int profile
)
68 extern void _dl_runtime_resolve (Elf32_Word
) attribute_hidden
;
69 extern void _dl_runtime_profile (Elf32_Word
) attribute_hidden
;
70 extern void _dl_runtime_resolve_shstk (Elf32_Word
) attribute_hidden
;
71 extern void _dl_runtime_profile_shstk (Elf32_Word
) attribute_hidden
;
72 /* Check if SHSTK is enabled by kernel. */
74 = (GL(dl_x86_feature_1
)[0] & GNU_PROPERTY_X86_FEATURE_1_SHSTK
) != 0;
76 if (l
->l_info
[DT_JMPREL
] && lazy
)
78 /* The GOT entries for functions in the PLT have not yet been filled
79 in. Their initial contents will arrange when called to push an
80 offset into the .rel.plt section, push _GLOBAL_OFFSET_TABLE_[1],
81 and then jump to _GLOBAL_OFFSET_TABLE[2]. */
82 got
= (Elf32_Addr
*) D_PTR (l
, l_info
[DT_PLTGOT
]);
83 /* If a library is prelinked but we have to relocate anyway,
84 we have to be able to undo the prelinking of .got.plt.
85 The prelinker saved us here address of .plt + 0x16. */
88 l
->l_mach
.plt
= got
[1] + l
->l_addr
;
89 l
->l_mach
.gotplt
= (Elf32_Addr
) &got
[3];
91 got
[1] = (Elf32_Addr
) l
; /* Identify this shared object. */
93 /* The got[2] entry contains the address of a function which gets
94 called to get the address of a so far unresolved function and
95 jump to it. The profiling extension of the dynamic linker allows
96 to intercept the calls to collect information. In this case we
97 don't store the address in the GOT so that all future calls also
98 end in this function. */
99 if (__glibc_unlikely (profile
))
101 got
[2] = (shstk_enabled
102 ? (Elf32_Addr
) &_dl_runtime_profile_shstk
103 : (Elf32_Addr
) &_dl_runtime_profile
);
105 if (GLRO(dl_profile
) != NULL
106 && _dl_name_match_p (GLRO(dl_profile
), l
))
107 /* This is the object we are looking for. Say that we really
108 want profiling and the timers are started. */
109 GL(dl_profile_map
) = l
;
112 /* This function will get called to fix up the GOT entry indicated by
113 the offset on the stack, and then jump to the resolved address. */
114 got
[2] = (shstk_enabled
115 ? (Elf32_Addr
) &_dl_runtime_resolve_shstk
116 : (Elf32_Addr
) &_dl_runtime_resolve
);
125 /* We add a declaration of this function here so that in dl-runtime.c
126 the ELF_MACHINE_RUNTIME_TRAMPOLINE macro really can pass the parameters
129 We cannot use this scheme for profiling because the _mcount call
130 destroys the passed register information. */
131 #define ARCH_FIXUP_ATTRIBUTE __attribute__ ((regparm (3), stdcall, unused))
133 extern ElfW(Addr
) _dl_fixup (struct link_map
*l
,
134 ElfW(Word
) reloc_offset
)
135 ARCH_FIXUP_ATTRIBUTE
;
136 extern ElfW(Addr
) _dl_profile_fixup (struct link_map
*l
,
137 ElfW(Word
) reloc_offset
,
138 ElfW(Addr
) retaddr
, void *regs
,
139 long int *framesizep
)
140 ARCH_FIXUP_ATTRIBUTE
;
145 /* Mask identifying addresses reserved for the user program,
146 where the dynamic linker should not map anything. */
147 #define ELF_MACHINE_USER_ADDRESS_MASK 0xf8000000UL
149 /* Initial entry point code for the dynamic linker.
150 The C function `_dl_start' is the real entry point;
151 its return value is the user program's entry point. */
153 #define RTLD_START asm ("\n\
156 0: movl (%esp), %ebx\n\
160 .globl _dl_start_user\n\
168 # Save the user entry point address in %edi.\n\
170 # Point %ebx at the GOT.\n\
172 addl $_GLOBAL_OFFSET_TABLE_, %ebx\n\
173 # See if we were run as a command with the executable file\n\
174 # name as an extra leading argument.\n\
175 movl _dl_skip_args@GOTOFF(%ebx), %eax\n\
176 # Pop the original argument count.\n\
178 # Adjust the stack pointer to skip _dl_skip_args words.\n\
179 leal (%esp,%eax,4), %esp\n\
180 # Subtract _dl_skip_args from argc.\n\
182 # Push argc back on the stack.\n\
184 # The special initializer gets called with the stack just\n\
185 # as the application's entry point will see it; it can\n\
186 # switch stacks if it moves these contents over.\n\
187 " RTLD_START_SPECIAL_INIT "\n\
188 # Load the parameters again.\n\
189 # (eax, edx, ecx, esi) = (_dl_loaded, argc, argv, envp)\n\
190 movl _rtld_local@GOTOFF(%ebx), %eax\n\
191 leal 8(%esp,%edx,4), %esi\n\
192 leal 4(%esp), %ecx\n\
194 # Make sure _dl_init is run with 16 byte aligned stack.\n\
198 # Arguments for _dl_init.\n\
203 # Clear %ebp, so that even constructors have terminated backchain.\n\
205 # Call the function to run the initializers.\n\
207 # Pass our finalizer function to the user in %edx, as per ELF ABI.\n\
208 leal _dl_fini@GOTOFF(%ebx), %edx\n\
209 # Restore %esp _start expects.\n\
210 movl 16(%esp), %esp\n\
211 # Jump to the user's entry point.\n\
216 #ifndef RTLD_START_SPECIAL_INIT
217 # define RTLD_START_SPECIAL_INIT /* nothing */
220 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
221 TLS variable, so undefined references should not be allowed to
223 ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one
224 of the main executable's symbols, as for a COPY reloc.
225 ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA iff TYPE describes relocation may
226 against protected data whose address be external due to copy relocation.
228 # define elf_machine_type_class(type) \
229 ((((type) == R_386_JMP_SLOT || (type) == R_386_TLS_DTPMOD32 \
230 || (type) == R_386_TLS_DTPOFF32 || (type) == R_386_TLS_TPOFF32 \
231 || (type) == R_386_TLS_TPOFF || (type) == R_386_TLS_DESC) \
232 * ELF_RTYPE_CLASS_PLT) \
233 | (((type) == R_386_COPY) * ELF_RTYPE_CLASS_COPY) \
234 | (((type) == R_386_GLOB_DAT) * ELF_RTYPE_CLASS_EXTERN_PROTECTED_DATA))
236 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
237 #define ELF_MACHINE_JMP_SLOT R_386_JMP_SLOT
239 /* The i386 never uses Elf32_Rela relocations for the dynamic linker.
240 Prelinked libraries may use Elf32_Rela though. */
241 #define ELF_MACHINE_PLT_REL 1
243 /* We define an initialization functions. This is called very early in
245 #define DL_PLATFORM_INIT dl_platform_init ()
247 static inline void __attribute__ ((unused
))
248 dl_platform_init (void)
251 /* init_cpu_features has been called early from __libc_start_main in
252 static executable. */
253 init_cpu_features (&GLRO(dl_x86_cpu_features
));
255 if (GLRO(dl_platform
) != NULL
&& *GLRO(dl_platform
) == '\0')
256 /* Avoid an empty string which would disturb us. */
257 GLRO(dl_platform
) = NULL
;
261 static inline Elf32_Addr
262 elf_machine_fixup_plt (struct link_map
*map
, lookup_t t
,
263 const ElfW(Sym
) *refsym
, const ElfW(Sym
) *sym
,
264 const Elf32_Rel
*reloc
,
265 Elf32_Addr
*reloc_addr
, Elf32_Addr value
)
267 return *reloc_addr
= value
;
270 /* Return the final value of a plt relocation. */
271 static inline Elf32_Addr
272 elf_machine_plt_value (struct link_map
*map
, const Elf32_Rel
*reloc
,
279 /* Names of the architecture-specific auditing callback functions. */
280 #define ARCH_LA_PLTENTER i86_gnu_pltenter
281 #define ARCH_LA_PLTEXIT i86_gnu_pltexit
283 #endif /* !dl_machine_h */
285 /* The i386 never uses Elf32_Rela relocations for the dynamic linker.
286 Prelinked libraries may use Elf32_Rela though. */
287 #define ELF_MACHINE_NO_RELA defined RTLD_BOOTSTRAP
288 #define ELF_MACHINE_NO_REL 0
292 /* Perform the relocation specified by RELOC and SYM (which is fully resolved).
293 MAP is the object containing the reloc. */
296 __attribute ((always_inline
))
297 elf_machine_rel (struct link_map
*map
, const Elf32_Rel
*reloc
,
298 const Elf32_Sym
*sym
, const struct r_found_version
*version
,
299 void *const reloc_addr_arg
, int skip_ifunc
)
301 Elf32_Addr
*const reloc_addr
= reloc_addr_arg
;
302 const unsigned int r_type
= ELF32_R_TYPE (reloc
->r_info
);
304 # if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
305 if (__glibc_unlikely (r_type
== R_386_RELATIVE
))
307 # if !defined RTLD_BOOTSTRAP && !defined HAVE_Z_COMBRELOC
308 /* This is defined in rtld.c, but nowhere in the static libc.a;
309 make the reference weak so static programs can still link.
310 This declaration cannot be done when compiling rtld.c
311 (i.e. #ifdef RTLD_BOOTSTRAP) because rtld.c contains the
312 common defn for _dl_rtld_map, which is incompatible with a
313 weak decl in the same file. */
315 weak_extern (_dl_rtld_map
);
317 if (map
!= &GL(dl_rtld_map
)) /* Already done in rtld itself. */
319 *reloc_addr
+= map
->l_addr
;
321 # ifndef RTLD_BOOTSTRAP
322 else if (__glibc_unlikely (r_type
== R_386_NONE
))
326 # endif /* !RTLD_BOOTSTRAP and have no -z combreloc */
328 # ifndef RTLD_BOOTSTRAP
329 const Elf32_Sym
*const refsym
= sym
;
331 struct link_map
*sym_map
= RESOLVE_MAP (&sym
, version
, r_type
);
332 Elf32_Addr value
= SYMBOL_ADDRESS (sym_map
, sym
, true);
335 && __glibc_unlikely (ELFW(ST_TYPE
) (sym
->st_info
) == STT_GNU_IFUNC
)
336 && __glibc_likely (sym
->st_shndx
!= SHN_UNDEF
)
337 && __glibc_likely (!skip_ifunc
))
339 # ifndef RTLD_BOOTSTRAP
341 && sym_map
->l_type
!= lt_executable
342 && !sym_map
->l_relocated
)
345 = (const char *) D_PTR (map
, l_info
[DT_STRTAB
]);
347 %s: Relink `%s' with `%s' for IFUNC symbol `%s'\n",
348 RTLD_PROGNAME
, map
->l_name
,
350 strtab
+ refsym
->st_name
);
353 value
= ((Elf32_Addr (*) (void)) value
) ();
358 # ifndef RTLD_BOOTSTRAP
360 /* Set to symbol size plus addend. */
361 *reloc_addr
+= sym
->st_size
;
369 case R_386_TLS_DTPMOD32
:
370 # ifdef RTLD_BOOTSTRAP
371 /* During startup the dynamic linker is always the module
373 XXX If this relocation is necessary move before RESOLVE
377 /* Get the information from the link map returned by the
380 *reloc_addr
= sym_map
->l_tls_modid
;
383 case R_386_TLS_DTPOFF32
:
384 # ifndef RTLD_BOOTSTRAP
385 /* During relocation all TLS symbols are defined and used.
386 Therefore the offset is already correct. */
388 *reloc_addr
= sym
->st_value
;
393 struct tlsdesc
volatile *td
=
394 (struct tlsdesc
volatile *)reloc_addr
;
396 # ifndef RTLD_BOOTSTRAP
398 td
->entry
= _dl_tlsdesc_undefweak
;
402 # ifndef RTLD_BOOTSTRAP
404 CHECK_STATIC_TLS (map
, sym_map
);
406 if (!TRY_STATIC_TLS (map
, sym_map
))
408 td
->arg
= _dl_make_tlsdesc_dynamic
409 (sym_map
, sym
->st_value
+ (ElfW(Word
))td
->arg
);
410 td
->entry
= _dl_tlsdesc_dynamic
;
416 td
->arg
= (void*)(sym
->st_value
- sym_map
->l_tls_offset
417 + (ElfW(Word
))td
->arg
);
418 td
->entry
= _dl_tlsdesc_return
;
423 case R_386_TLS_TPOFF32
:
424 /* The offset is positive, backward from the thread pointer. */
425 # ifdef RTLD_BOOTSTRAP
426 *reloc_addr
+= map
->l_tls_offset
- sym
->st_value
;
428 /* We know the offset of object the symbol is contained in.
429 It is a positive value which will be subtracted from the
430 thread pointer. To get the variable position in the TLS
431 block we subtract the offset from that of the TLS block. */
434 CHECK_STATIC_TLS (map
, sym_map
);
435 *reloc_addr
+= sym_map
->l_tls_offset
- sym
->st_value
;
439 case R_386_TLS_TPOFF
:
440 /* The offset is negative, forward from the thread pointer. */
441 # ifdef RTLD_BOOTSTRAP
442 *reloc_addr
+= sym
->st_value
- map
->l_tls_offset
;
444 /* We know the offset of object the symbol is contained in.
445 It is a negative value which will be added to the
449 CHECK_STATIC_TLS (map
, sym_map
);
450 *reloc_addr
+= sym
->st_value
- sym_map
->l_tls_offset
;
455 # ifndef RTLD_BOOTSTRAP
457 *reloc_addr
+= value
;
460 *reloc_addr
+= (value
- (Elf32_Addr
) reloc_addr
);
464 /* This can happen in trace mode if an object could not be
467 if (__glibc_unlikely (sym
->st_size
> refsym
->st_size
)
468 || (__glibc_unlikely(sym
->st_size
< refsym
->st_size
)
469 && GLRO(dl_verbose
)))
473 strtab
= (const char *) D_PTR (map
, l_info
[DT_STRTAB
]);
475 %s: Symbol `%s' has different size in shared object, consider re-linking\n",
476 RTLD_PROGNAME
, strtab
+ refsym
->st_name
);
478 memcpy (reloc_addr_arg
, (void *) value
,
479 MIN (sym
->st_size
, refsym
->st_size
));
481 case R_386_IRELATIVE
:
482 value
= map
->l_addr
+ *reloc_addr
;
483 if (__glibc_likely (!skip_ifunc
))
484 value
= ((Elf32_Addr (*) (void)) value
) ();
488 _dl_reloc_bad_type (map
, r_type
, 0);
490 # endif /* !RTLD_BOOTSTRAP */
495 # ifndef RTLD_BOOTSTRAP
497 __attribute__ ((always_inline
))
498 elf_machine_rela (struct link_map
*map
, const Elf32_Rela
*reloc
,
499 const Elf32_Sym
*sym
, const struct r_found_version
*version
,
500 void *const reloc_addr_arg
, int skip_ifunc
)
502 Elf32_Addr
*const reloc_addr
= reloc_addr_arg
;
503 const unsigned int r_type
= ELF32_R_TYPE (reloc
->r_info
);
505 if (ELF32_R_TYPE (reloc
->r_info
) == R_386_RELATIVE
)
506 *reloc_addr
= map
->l_addr
+ reloc
->r_addend
;
507 else if (r_type
!= R_386_NONE
)
509 # ifndef RESOLVE_CONFLICT_FIND_MAP
510 const Elf32_Sym
*const refsym
= sym
;
512 struct link_map
*sym_map
= RESOLVE_MAP (&sym
, version
, r_type
);
513 Elf32_Addr value
= SYMBOL_ADDRESS (sym_map
, sym
, true);
516 && __glibc_likely (sym
->st_shndx
!= SHN_UNDEF
)
517 && __glibc_unlikely (ELFW(ST_TYPE
) (sym
->st_info
) == STT_GNU_IFUNC
)
518 && __glibc_likely (!skip_ifunc
))
519 value
= ((Elf32_Addr (*) (void)) value
) ();
521 switch (ELF32_R_TYPE (reloc
->r_info
))
524 /* Set to symbol size plus addend. */
525 value
= sym
->st_size
;
530 *reloc_addr
= value
+ reloc
->r_addend
;
532 # ifndef RESOLVE_CONFLICT_FIND_MAP
533 /* Not needed for dl-conflict.c. */
535 *reloc_addr
= (value
+ reloc
->r_addend
- (Elf32_Addr
) reloc_addr
);
538 case R_386_TLS_DTPMOD32
:
539 /* Get the information from the link map returned by the
542 *reloc_addr
= sym_map
->l_tls_modid
;
544 case R_386_TLS_DTPOFF32
:
545 /* During relocation all TLS symbols are defined and used.
546 Therefore the offset is already correct. */
547 *reloc_addr
= (sym
== NULL
? 0 : sym
->st_value
) + reloc
->r_addend
;
551 struct tlsdesc
volatile *td
=
552 (struct tlsdesc
volatile *)reloc_addr
;
554 # ifndef RTLD_BOOTSTRAP
557 td
->arg
= (void*)reloc
->r_addend
;
558 td
->entry
= _dl_tlsdesc_undefweak
;
563 # ifndef RTLD_BOOTSTRAP
565 CHECK_STATIC_TLS (map
, sym_map
);
567 if (!TRY_STATIC_TLS (map
, sym_map
))
569 td
->arg
= _dl_make_tlsdesc_dynamic
570 (sym_map
, sym
->st_value
+ reloc
->r_addend
);
571 td
->entry
= _dl_tlsdesc_dynamic
;
577 td
->arg
= (void*)(sym
->st_value
- sym_map
->l_tls_offset
579 td
->entry
= _dl_tlsdesc_return
;
584 case R_386_TLS_TPOFF32
:
585 /* The offset is positive, backward from the thread pointer. */
586 /* We know the offset of object the symbol is contained in.
587 It is a positive value which will be subtracted from the
588 thread pointer. To get the variable position in the TLS
589 block we subtract the offset from that of the TLS block. */
592 CHECK_STATIC_TLS (map
, sym_map
);
593 *reloc_addr
= sym_map
->l_tls_offset
- sym
->st_value
597 case R_386_TLS_TPOFF
:
598 /* The offset is negative, forward from the thread pointer. */
599 /* We know the offset of object the symbol is contained in.
600 It is a negative value which will be added to the
604 CHECK_STATIC_TLS (map
, sym_map
);
605 *reloc_addr
= sym
->st_value
- sym_map
->l_tls_offset
611 /* This can happen in trace mode if an object could not be
614 if (__glibc_unlikely (sym
->st_size
> refsym
->st_size
)
615 || (__glibc_unlikely (sym
->st_size
< refsym
->st_size
)
616 && GLRO(dl_verbose
)))
620 strtab
= (const char *) D_PTR (map
, l_info
[DT_STRTAB
]);
622 %s: Symbol `%s' has different size in shared object, consider re-linking\n",
623 RTLD_PROGNAME
, strtab
+ refsym
->st_name
);
625 memcpy (reloc_addr_arg
, (void *) value
,
626 MIN (sym
->st_size
, refsym
->st_size
));
628 # endif /* !RESOLVE_CONFLICT_FIND_MAP */
629 case R_386_IRELATIVE
:
630 value
= map
->l_addr
+ reloc
->r_addend
;
631 if (__glibc_likely (!skip_ifunc
))
632 value
= ((Elf32_Addr (*) (void)) value
) ();
636 /* We add these checks in the version to relocate ld.so only
637 if we are still debugging. */
638 _dl_reloc_bad_type (map
, r_type
, 0);
643 # endif /* !RTLD_BOOTSTRAP */
646 __attribute ((always_inline
))
647 elf_machine_rel_relative (Elf32_Addr l_addr
, const Elf32_Rel
*reloc
,
648 void *const reloc_addr_arg
)
650 Elf32_Addr
*const reloc_addr
= reloc_addr_arg
;
651 assert (ELF32_R_TYPE (reloc
->r_info
) == R_386_RELATIVE
);
652 *reloc_addr
+= l_addr
;
655 # ifndef RTLD_BOOTSTRAP
657 __attribute__ ((always_inline
))
658 elf_machine_rela_relative (Elf32_Addr l_addr
, const Elf32_Rela
*reloc
,
659 void *const reloc_addr_arg
)
661 Elf32_Addr
*const reloc_addr
= reloc_addr_arg
;
662 *reloc_addr
= l_addr
+ reloc
->r_addend
;
664 # endif /* !RTLD_BOOTSTRAP */
667 __attribute__ ((always_inline
))
668 elf_machine_lazy_rel (struct link_map
*map
,
669 Elf32_Addr l_addr
, const Elf32_Rel
*reloc
,
672 Elf32_Addr
*const reloc_addr
= (void *) (l_addr
+ reloc
->r_offset
);
673 const unsigned int r_type
= ELF32_R_TYPE (reloc
->r_info
);
674 /* Check for unexpected PLT reloc type. */
675 if (__glibc_likely (r_type
== R_386_JMP_SLOT
))
677 /* Prelink has been deprecated. */
678 if (__glibc_likely (map
->l_mach
.plt
== 0))
679 *reloc_addr
+= l_addr
;
681 *reloc_addr
= (map
->l_mach
.plt
682 + (((Elf32_Addr
) reloc_addr
) - map
->l_mach
.gotplt
) * 4);
684 else if (__glibc_likely (r_type
== R_386_TLS_DESC
))
686 struct tlsdesc
volatile * __attribute__((__unused__
)) td
=
687 (struct tlsdesc
volatile *)reloc_addr
;
689 /* Handle relocations that reference the local *ABS* in a simple
690 way, so as to preserve a potential addend. */
691 if (ELF32_R_SYM (reloc
->r_info
) == 0)
692 td
->entry
= _dl_tlsdesc_resolve_abs_plus_addend
;
693 /* Given a known-zero addend, we can store a pointer to the
694 reloc in the arg position. */
695 else if (td
->arg
== 0)
697 td
->arg
= (void*)reloc
;
698 td
->entry
= _dl_tlsdesc_resolve_rel
;
702 /* We could handle non-*ABS* relocations with non-zero addends
703 by allocating dynamically an arg to hold a pointer to the
704 reloc, but that sounds pointless. */
705 const Elf32_Rel
*const r
= reloc
;
706 /* The code below was borrowed from elf_dynamic_do_rel(). */
707 const ElfW(Sym
) *const symtab
=
708 (const void *) D_PTR (map
, l_info
[DT_SYMTAB
]);
710 # ifdef RTLD_BOOTSTRAP
711 /* The dynamic linker always uses versioning. */
712 assert (map
->l_info
[VERSYMIDX (DT_VERSYM
)] != NULL
);
714 if (map
->l_info
[VERSYMIDX (DT_VERSYM
)])
717 const ElfW(Half
) *const version
=
718 (const void *) D_PTR (map
, l_info
[VERSYMIDX (DT_VERSYM
)]);
719 ElfW(Half
) ndx
= version
[ELFW(R_SYM
) (r
->r_info
)] & 0x7fff;
720 elf_machine_rel (map
, r
, &symtab
[ELFW(R_SYM
) (r
->r_info
)],
721 &map
->l_versions
[ndx
],
722 (void *) (l_addr
+ r
->r_offset
), skip_ifunc
);
724 # ifndef RTLD_BOOTSTRAP
726 elf_machine_rel (map
, r
, &symtab
[ELFW(R_SYM
) (r
->r_info
)], NULL
,
727 (void *) (l_addr
+ r
->r_offset
), skip_ifunc
);
731 else if (__glibc_unlikely (r_type
== R_386_IRELATIVE
))
733 Elf32_Addr value
= map
->l_addr
+ *reloc_addr
;
734 if (__glibc_likely (!skip_ifunc
))
735 value
= ((Elf32_Addr (*) (void)) value
) ();
739 _dl_reloc_bad_type (map
, r_type
, 1);
742 # ifndef RTLD_BOOTSTRAP
745 __attribute__ ((always_inline
))
746 elf_machine_lazy_rela (struct link_map
*map
,
747 Elf32_Addr l_addr
, const Elf32_Rela
*reloc
,
750 Elf32_Addr
*const reloc_addr
= (void *) (l_addr
+ reloc
->r_offset
);
751 const unsigned int r_type
= ELF32_R_TYPE (reloc
->r_info
);
752 if (__glibc_likely (r_type
== R_386_JMP_SLOT
))
754 else if (__glibc_likely (r_type
== R_386_TLS_DESC
))
756 struct tlsdesc
volatile * __attribute__((__unused__
)) td
=
757 (struct tlsdesc
volatile *)reloc_addr
;
759 td
->arg
= (void*)reloc
;
760 td
->entry
= _dl_tlsdesc_resolve_rela
;
762 else if (__glibc_unlikely (r_type
== R_386_IRELATIVE
))
764 Elf32_Addr value
= map
->l_addr
+ reloc
->r_addend
;
765 if (__glibc_likely (!skip_ifunc
))
766 value
= ((Elf32_Addr (*) (void)) value
) ();
770 _dl_reloc_bad_type (map
, r_type
, 1);
773 # endif /* !RTLD_BOOTSTRAP */
775 #endif /* RESOLVE_MAP */