1 /* Machine-dependent ELF dynamic relocation inline functions. MIPS version.
2 Copyright (C) 1996-2015 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Kazumoto Kojima <kkojima@info.kanagawa-u.ac.jp>.
6 The GNU C 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 2.1 of the License, or (at your option) any later version.
11 The GNU C 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 the GNU C Library. If not, see
18 <http://www.gnu.org/licenses/>. */
20 /* FIXME: Profiling of shared libraries is not implemented yet. */
24 #define ELF_MACHINE_NAME "MIPS"
29 #error ENTRY_POINT needs to be defined for MIPS.
37 /* The offset of gp from GOT might be system-dependent. It's set by
38 ld. The same value is also */
39 #define OFFSET_GP_GOT 0x7ff0
41 #ifndef _RTLD_PROLOGUE
42 # define _RTLD_PROLOGUE(entry) \
43 ".globl\t" __STRING(entry) "\n\t" \
44 ".ent\t" __STRING(entry) "\n\t" \
45 ".type\t" __STRING(entry) ", @function\n" \
46 __STRING(entry) ":\n\t"
49 #ifndef _RTLD_EPILOGUE
50 # define _RTLD_EPILOGUE(entry) \
51 ".end\t" __STRING(entry) "\n\t" \
52 ".size\t" __STRING(entry) ", . - " __STRING(entry) "\n\t"
55 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries.
56 This only makes sense on MIPS when using PLTs, so choose the
57 PLT relocation (not encountered when not using PLTs). */
58 #define ELF_MACHINE_JMP_SLOT R_MIPS_JUMP_SLOT
59 #define elf_machine_type_class(type) \
60 ((((type) == ELF_MACHINE_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
61 | (((type) == R_MIPS_COPY) * ELF_RTYPE_CLASS_COPY))
63 #define ELF_MACHINE_PLT_REL 1
64 #define ELF_MACHINE_NO_REL 0
65 #define ELF_MACHINE_NO_RELA 0
67 /* Translate a processor specific dynamic tag to the index
69 #define DT_MIPS(x) (DT_MIPS_##x - DT_LOPROC + DT_NUM)
71 /* If there is a DT_MIPS_RLD_MAP entry in the dynamic section, fill it in
72 with the run-time address of the r_debug structure */
73 #define ELF_MACHINE_DEBUG_SETUP(l,r) \
74 do { if ((l)->l_info[DT_MIPS (RLD_MAP)]) \
75 *(ElfW(Addr) *)((l)->l_info[DT_MIPS (RLD_MAP)]->d_un.d_ptr) = \
79 #if ((defined __mips_nan2008 && !defined HAVE_MIPS_NAN2008) \
80 || (!defined __mips_nan2008 && defined HAVE_MIPS_NAN2008))
81 # error "Configuration inconsistency: __mips_nan2008 != HAVE_MIPS_NAN2008, overridden CFLAGS?"
84 # define ELF_MACHINE_NAN2008 EF_MIPS_NAN2008
86 # define ELF_MACHINE_NAN2008 0
89 /* Return nonzero iff ELF header is compatible with the running host. */
90 static inline int __attribute_used__
91 elf_machine_matches_host (const ElfW(Ehdr
) *ehdr
)
93 #if _MIPS_SIM == _ABIO32 || _MIPS_SIM == _ABIN32
94 /* Don't link o32 and n32 together. */
95 if (((ehdr
->e_flags
& EF_MIPS_ABI2
) != 0) != (_MIPS_SIM
== _ABIN32
))
99 /* Don't link 2008-NaN and legacy-NaN objects together. */
100 if ((ehdr
->e_flags
& EF_MIPS_NAN2008
) != ELF_MACHINE_NAN2008
)
103 /* Ensure that the old O32 FP64 ABI is never loaded, it is not supported
105 if (ehdr
->e_flags
& EF_MIPS_FP64
)
108 switch (ehdr
->e_machine
)
118 static inline ElfW(Addr
) *
119 elf_mips_got_from_gpreg (ElfW(Addr
) gpreg
)
121 /* FIXME: the offset of gp from GOT may be system-dependent. */
122 return (ElfW(Addr
) *) (gpreg
- OFFSET_GP_GOT
);
125 /* Return the link-time address of _DYNAMIC. Conveniently, this is the
126 first element of the GOT. This must be inlined in a function which
127 uses global data. We assume its $gp points to the primary GOT. */
128 static inline ElfW(Addr
)
129 elf_machine_dynamic (void)
131 register ElfW(Addr
) gp
__asm__ ("$28");
132 return *elf_mips_got_from_gpreg (gp
);
135 #define STRINGXP(X) __STRING(X)
136 #define STRINGXV(X) STRINGV_(X)
137 #define STRINGV_(...) # __VA_ARGS__
139 /* Return the run-time load address of the shared object. */
140 static inline ElfW(Addr
)
141 elf_machine_load_address (void)
145 asm (" .set noreorder\n"
146 " " STRINGXP (PTR_LA
) " %0, 0f\n"
147 # if __mips_isa_rev < 6
150 "0: " STRINGXP (PTR_SUBU
) " %0, $31, %0\n"
152 "0: addiupc $31, 0\n"
153 " " STRINGXP (PTR_SUBU
) " %0, $31, %0\n"
161 asm (" .set noreorder\n"
163 " lw %1,%%got(0f)(%1)\n"
164 "0: .fill 0\n" /* Clear the ISA bit on 0:. */
166 " addiu %1,%%lo(0b)\n"
169 : "=d" (addr
), "=d" (tmp
)
175 /* The MSB of got[1] of a gnu object is set to identify gnu objects. */
176 #if _MIPS_SIM == _ABI64
177 # define ELF_MIPS_GNU_GOT1_MASK 0x8000000000000000L
179 # define ELF_MIPS_GNU_GOT1_MASK 0x80000000L
182 /* We can't rely on elf_machine_got_rel because _dl_object_relocation_scope
183 fiddles with global data. */
184 #define ELF_MACHINE_BEFORE_RTLD_RELOC(dynamic_info) \
186 struct link_map *map = &bootstrap_map; \
191 got = (ElfW(Addr) *) D_PTR (map, l_info[DT_PLTGOT]); \
193 if (__builtin_expect (map->l_addr == 0, 1)) \
196 /* got[0] is reserved. got[1] is also reserved for the dynamic object \
197 generated by gnu ld. Skip these reserved entries from \
199 i = (got[1] & ELF_MIPS_GNU_GOT1_MASK)? 2 : 1; \
200 n = map->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val; \
202 /* Add the run-time displacement to all local got entries. */ \
204 got[i++] += map->l_addr; \
206 /* Handle global got entries. */ \
208 sym = (ElfW(Sym) *) D_PTR(map, l_info[DT_SYMTAB]) \
209 + map->l_info[DT_MIPS (GOTSYM)]->d_un.d_val; \
210 i = (map->l_info[DT_MIPS (SYMTABNO)]->d_un.d_val \
211 - map->l_info[DT_MIPS (GOTSYM)]->d_un.d_val); \
215 if (sym->st_shndx == SHN_UNDEF || sym->st_shndx == SHN_COMMON) \
216 *got = map->l_addr + sym->st_value; \
217 else if (ELFW(ST_TYPE) (sym->st_info) == STT_FUNC \
218 && *got != sym->st_value) \
219 *got += map->l_addr; \
220 else if (ELFW(ST_TYPE) (sym->st_info) == STT_SECTION) \
222 if (sym->st_other == 0) \
223 *got += map->l_addr; \
226 *got = map->l_addr + sym->st_value; \
234 /* Mask identifying addresses reserved for the user program,
235 where the dynamic linker should not map anything. */
236 #define ELF_MACHINE_USER_ADDRESS_MASK 0x80000000UL
239 /* Initial entry point code for the dynamic linker.
240 The C function `_dl_start' is the real entry point;
241 its return value is the user program's entry point.
242 Note how we have to be careful about two things:
244 1) That we allocate a minimal stack of 24 bytes for
245 every function call, the MIPS ABI states that even
246 if all arguments are passed in registers the procedure
247 called can use the 16 byte area pointed to by $sp
248 when it is called to store away the arguments passed
251 2) That under Unix the entry is named __start
252 and not just plain _start. */
255 # if __mips_isa_rev < 6
256 # define LCOFF STRINGXP(.Lcof2)
257 # define LOAD_31 STRINGXP(bltzal $8) "," STRINGXP(.Lcof2)
259 # define LCOFF STRINGXP(.Lcof1)
260 # define LOAD_31 "addiupc $31, 0"
262 # define RTLD_START asm (\
264 " _RTLD_PROLOGUE(ENTRY_POINT) "\
265 " STRINGXV(SETUP_GPX($25)) "\n\
266 " STRINGXV(SETUP_GPX64($18,$25)) "\n\
267 # i386 ABI book says that the first entry of GOT holds\n\
268 # the address of the dynamic structure. Though MIPS ABI\n\
269 # doesn't say nothing about this, I emulate this here.\n\
270 " STRINGXP(PTR_LA) " $4, _DYNAMIC\n\
271 # Subtract OFFSET_GP_GOT\n\
272 " STRINGXP(PTR_S) " $4, -0x7ff0($28)\n\
274 " STRINGXP(PTR_SUBIU) " $29, 16\n\
276 " STRINGXP(PTR_LA) " $8, " LCOFF "\n\
277 .Lcof1: " LOAD_31 "\n\
278 .Lcof2: " STRINGXP(PTR_SUBU) " $8, $31, $8\n\
280 " STRINGXP(PTR_LA) " $25, _dl_start\n\
281 " STRINGXP(PTR_ADDU) " $25, $8\n\
284 " STRINGXP(PTR_ADDIU) " $29, 16\n\
285 # Get the value of label '_dl_start_user' in t9 ($25).\n\
286 " STRINGXP(PTR_LA) " $25, _dl_start_user\n\
287 " _RTLD_EPILOGUE(ENTRY_POINT) "\
290 " _RTLD_PROLOGUE(_dl_start_user) "\
291 " STRINGXP(SETUP_GP) "\n\
292 " STRINGXV(SETUP_GP64($18,_dl_start_user)) "\n\
294 # Save the user entry point address in a saved register.\n\
296 # See if we were run as a command with the executable file\n\
297 # name as an extra leading argument.\n\
298 lw $2, _dl_skip_args\n\
300 # Load the original argument count.\n\
301 " STRINGXP(PTR_L) " $4, 0($29)\n\
302 # Subtract _dl_skip_args from it.\n\
304 # Adjust the stack pointer to skip _dl_skip_args words.\n\
305 sll $2, " STRINGXP (PTRLOG) "\n\
306 " STRINGXP(PTR_ADDU) " $29, $2\n\
307 # Save back the modified argument count.\n\
308 " STRINGXP(PTR_S) " $4, 0($29)\n\
309 1: # Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env) \n\
310 " STRINGXP(PTR_L) " $4, _rtld_local\n\
311 " STRINGXP(PTR_L) /* or lw??? fixme */ " $5, 0($29)\n\
312 " STRINGXP(PTR_LA) " $6, " STRINGXP (PTRSIZE) "($29)\n\
313 sll $7, $5, " STRINGXP (PTRLOG) "\n\
314 " STRINGXP(PTR_ADDU) " $7, $7, $6\n\
315 " STRINGXP(PTR_ADDU) " $7, $7, " STRINGXP (PTRSIZE) " \n\
316 # Make sure the stack pointer is aligned for _dl_init.\n\
317 and $2, $29, -2 * " STRINGXP(SZREG) "\n\
319 " STRINGXP(PTR_SUBIU) " $29, $2, 32\n\
320 " STRINGXP(PTR_S) " $8, (32 - " STRINGXP(SZREG) ")($29)\n\
321 " STRINGXP(SAVE_GP(16)) "\n\
322 # Call the function to run the initializers.\n\
324 # Restore the stack pointer for _start.\n\
325 " STRINGXP(PTR_L) " $29, (32 - " STRINGXP(SZREG) ")($29)\n\
326 # Pass our finalizer function to the user in $2 as per ELF ABI.\n\
327 " STRINGXP(PTR_LA) " $2, _dl_fini\n\
328 # Jump to the user entry point.\n\
331 _RTLD_EPILOGUE(_dl_start_user)\
336 /* MIPS16 version. We currently only support O32 under MIPS16; the proper
337 assembly preprocessor abstractions will need to be added if other ABIs
338 are to be supported. */
340 # define RTLD_START asm (\
343 " _RTLD_PROLOGUE (ENTRY_POINT) "\
344 # Construct GP value in $3.\n\
345 li $3, %hi(_gp_disp)\n\
346 addiu $4, $pc, %lo(_gp_disp)\n\
350 lw $4, %got(_DYNAMIC)($3)\n\
351 sw $4, -0x7ff0($3)\n\
354 # _dl_start() is sufficiently near to use pc-relative\n\
360 " _RTLD_EPILOGUE (ENTRY_POINT) "\
363 " _RTLD_PROLOGUE (_dl_start_user) "\
364 li $16, %hi(_gp_disp)\n\
365 addiu $4, $pc, %lo(_gp_disp)\n\
370 lw $4, %got(_dl_skip_args)($16)\n\
373 # Load the original argument count.\n\
375 # Subtract _dl_skip_args from it.\n\
377 # Adjust the stack pointer to skip _dl_skip_args words.\n\
378 sll $4, " STRINGXP (PTRLOG) "\n\
382 # Save back the modified argument count.\n\
384 1: # Call _dl_init (struct link_map *main_map, int argc, char **argv, char **env) \n\
385 lw $4, %got(_rtld_local)($16)\n\
388 addiu $6, $sp, " STRINGXP (PTRSIZE) "\n\
389 sll $7, $5, " STRINGXP (PTRLOG) "\n\
391 addu $7, " STRINGXP (PTRSIZE) "\n\
392 # Make sure the stack pointer is aligned for _dl_init.\n\
393 li $2, 2 * " STRINGXP (SZREG) "\n\
397 sw $3, -" STRINGXP (SZREG) "($2)\n\
401 # Call the function to run the initializers.\n\
402 lw $2, %call16(_dl_init)($16)\n\
405 # Restore the stack pointer for _start.\n\
406 lw $2, 32-" STRINGXP (SZREG) "($sp)\n\
409 # Pass our finalizer function to the user in $2 as per ELF ABI.\n\
410 lw $2, %call16(_dl_fini)($16)\n\
411 # Jump to the user entry point.\n\
414 _RTLD_EPILOGUE (_dl_start_user)\
418 #endif /* __mips16 */
420 /* Names of the architecture-specific auditing callback functions. */
421 # if _MIPS_SIM == _ABIO32
422 # define ARCH_LA_PLTENTER mips_o32_gnu_pltenter
423 # define ARCH_LA_PLTEXIT mips_o32_gnu_pltexit
424 # elif _MIPS_SIM == _ABIN32
425 # define ARCH_LA_PLTENTER mips_n32_gnu_pltenter
426 # define ARCH_LA_PLTEXIT mips_n32_gnu_pltexit
428 # define ARCH_LA_PLTENTER mips_n64_gnu_pltenter
429 # define ARCH_LA_PLTEXIT mips_n64_gnu_pltexit
432 /* We define an initialization function. This is called very early in
434 #define DL_PLATFORM_INIT dl_platform_init ()
436 static inline void __attribute__ ((unused
))
437 dl_platform_init (void)
439 if (GLRO(dl_platform
) != NULL
&& *GLRO(dl_platform
) == '\0')
440 /* Avoid an empty string which would disturb us. */
441 GLRO(dl_platform
) = NULL
;
444 /* For a non-writable PLT, rewrite the .got.plt entry at RELOC_ADDR to
445 point at the symbol with address VALUE. For a writable PLT, rewrite
446 the corresponding PLT entry instead. */
447 static inline ElfW(Addr
)
448 elf_machine_fixup_plt (struct link_map
*map
, lookup_t t
,
449 const ElfW(Rel
) *reloc
,
450 ElfW(Addr
) *reloc_addr
, ElfW(Addr
) value
)
452 return *reloc_addr
= value
;
455 static inline ElfW(Addr
)
456 elf_machine_plt_value (struct link_map
*map
, const ElfW(Rel
) *reloc
,
462 /* The semantics of zero/non-zero values of undefined symbols differs
463 depending on whether the non-PIC ABI is in use. Under the non-PIC
464 ABI, a non-zero value indicates that there is an address reference
465 to the symbol and thus it must always be resolved (except when
466 resolving a jump slot relocation) to the PLT entry whose address is
467 provided as the symbol's value; a zero value indicates that this
468 canonical-address behaviour is not required. Yet under the classic
469 MIPS psABI, a zero value indicates that there is an address
470 reference to the function and the dynamic linker must resolve the
471 symbol immediately upon loading. To avoid conflict, symbols for
472 which the dynamic linker must assume the non-PIC ABI semantics are
473 marked with the STO_MIPS_PLT flag. */
474 #define ELF_MACHINE_SYM_NO_MATCH(sym) \
475 ((sym)->st_shndx == SHN_UNDEF && !((sym)->st_other & STO_MIPS_PLT))
477 #endif /* !dl_machine_h */
481 /* Perform a relocation described by R_INFO at the location pointed to
482 by RELOC_ADDR. SYM is the relocation symbol specified by R_INFO and
483 MAP is the object containing the reloc. */
486 __attribute__ ((always_inline
))
487 elf_machine_reloc (struct link_map
*map
, ElfW(Addr
) r_info
,
488 const ElfW(Sym
) *sym
, const struct r_found_version
*version
,
489 void *reloc_addr
, ElfW(Addr
) r_addend
, int inplace_p
)
491 const unsigned long int r_type
= ELFW(R_TYPE
) (r_info
);
492 ElfW(Addr
) *addr_field
= (ElfW(Addr
) *) reloc_addr
;
494 #if !defined RTLD_BOOTSTRAP && !defined SHARED
495 /* This is defined in rtld.c, but nowhere in the static libc.a;
496 make the reference weak so static programs can still link. This
497 declaration cannot be done when compiling rtld.c (i.e. #ifdef
498 RTLD_BOOTSTRAP) because rtld.c contains the common defn for
499 _dl_rtld_map, which is incompatible with a weak decl in the same
501 weak_extern (GL(dl_rtld_map
));
506 #if !defined (RTLD_BOOTSTRAP)
507 # if _MIPS_SIM == _ABI64
508 case R_MIPS_TLS_DTPMOD64
:
509 case R_MIPS_TLS_DTPREL64
:
510 case R_MIPS_TLS_TPREL64
:
512 case R_MIPS_TLS_DTPMOD32
:
513 case R_MIPS_TLS_DTPREL32
:
514 case R_MIPS_TLS_TPREL32
:
517 struct link_map
*sym_map
= RESOLVE_MAP (&sym
, version
, r_type
);
521 case R_MIPS_TLS_DTPMOD64
:
522 case R_MIPS_TLS_DTPMOD32
:
524 *addr_field
= sym_map
->l_tls_modid
;
527 case R_MIPS_TLS_DTPREL64
:
528 case R_MIPS_TLS_DTPREL32
:
532 r_addend
= *addr_field
;
533 *addr_field
= r_addend
+ TLS_DTPREL_VALUE (sym
);
537 case R_MIPS_TLS_TPREL32
:
538 case R_MIPS_TLS_TPREL64
:
541 CHECK_STATIC_TLS (map
, sym_map
);
543 r_addend
= *addr_field
;
544 *addr_field
= r_addend
+ TLS_TPREL_VALUE (sym_map
, sym
);
553 #if _MIPS_SIM == _ABI64
554 case (R_MIPS_64
<< 8) | R_MIPS_REL32
:
559 int symidx
= ELFW(R_SYM
) (r_info
);
560 ElfW(Addr
) reloc_value
;
563 /* Support relocations on mis-aligned offsets. */
564 __builtin_memcpy (&reloc_value
, reloc_addr
, sizeof (reloc_value
));
566 reloc_value
= r_addend
;
570 const ElfW(Word
) gotsym
571 = (const ElfW(Word
)) map
->l_info
[DT_MIPS (GOTSYM
)]->d_un
.d_val
;
573 if ((ElfW(Word
))symidx
< gotsym
)
575 /* This wouldn't work for a symbol imported from other
576 libraries for which there's no GOT entry, but MIPS
577 requires every symbol referenced in a dynamic
578 relocation to have a GOT entry in the primary GOT,
579 so we only get here for locally-defined symbols.
580 For section symbols, we should *NOT* be adding
581 sym->st_value (per the definition of the meaning of
582 S in reloc expressions in the ELF64 MIPS ABI),
583 since it should have already been added to
584 reloc_value by the linker, but older versions of
585 GNU ld didn't add it, and newer versions don't emit
586 useless relocations to section symbols any more, so
587 it is safe to keep on adding sym->st_value, even
588 though it's not ABI compliant. Some day we should
589 bite the bullet and stop doing this. */
590 #ifndef RTLD_BOOTSTRAP
591 if (map
!= &GL(dl_rtld_map
))
593 reloc_value
+= sym
->st_value
+ map
->l_addr
;
597 #ifndef RTLD_BOOTSTRAP
598 const ElfW(Addr
) *got
599 = (const ElfW(Addr
) *) D_PTR (map
, l_info
[DT_PLTGOT
]);
600 const ElfW(Word
) local_gotno
602 map
->l_info
[DT_MIPS (LOCAL_GOTNO
)]->d_un
.d_val
;
604 reloc_value
+= got
[symidx
+ local_gotno
- gotsym
];
609 #ifndef RTLD_BOOTSTRAP
610 if (map
!= &GL(dl_rtld_map
))
612 reloc_value
+= map
->l_addr
;
614 __builtin_memcpy (reloc_addr
, &reloc_value
, sizeof (reloc_value
));
617 #ifndef RTLD_BOOTSTRAP
618 #if _MIPS_SIM == _ABI64
619 case (R_MIPS_64
<< 8) | R_MIPS_GLOB_DAT
:
621 case R_MIPS_GLOB_DAT
:
624 int symidx
= ELFW(R_SYM
) (r_info
);
625 const ElfW(Word
) gotsym
626 = (const ElfW(Word
)) map
->l_info
[DT_MIPS (GOTSYM
)]->d_un
.d_val
;
628 if (__builtin_expect ((ElfW(Word
)) symidx
>= gotsym
, 1))
630 const ElfW(Addr
) *got
631 = (const ElfW(Addr
) *) D_PTR (map
, l_info
[DT_PLTGOT
]);
632 const ElfW(Word
) local_gotno
633 = ((const ElfW(Word
))
634 map
->l_info
[DT_MIPS (LOCAL_GOTNO
)]->d_un
.d_val
);
636 ElfW(Addr
) reloc_value
= got
[symidx
+ local_gotno
- gotsym
];
637 __builtin_memcpy (reloc_addr
, &reloc_value
, sizeof (reloc_value
));
642 case R_MIPS_NONE
: /* Alright, Wilbur. */
645 case R_MIPS_JUMP_SLOT
:
647 struct link_map
*sym_map
;
650 /* The addend for a jump slot relocation must always be zero:
651 calls via the PLT always branch to the symbol's address and
652 not to the address plus a non-zero offset. */
654 _dl_signal_error (0, map
->l_name
, NULL
,
655 "found jump slot relocation with non-zero addend");
657 sym_map
= RESOLVE_MAP (&sym
, version
, r_type
);
658 value
= sym_map
== NULL
? 0 : sym_map
->l_addr
+ sym
->st_value
;
666 const ElfW(Sym
) *const refsym
= sym
;
667 struct link_map
*sym_map
;
670 /* Calculate the address of the symbol. */
671 sym_map
= RESOLVE_MAP (&sym
, version
, r_type
);
672 value
= sym_map
== NULL
? 0 : sym_map
->l_addr
+ sym
->st_value
;
674 if (__builtin_expect (sym
== NULL
, 0))
675 /* This can happen in trace mode if an object could not be
678 if (__builtin_expect (sym
->st_size
> refsym
->st_size
, 0)
679 || (__builtin_expect (sym
->st_size
< refsym
->st_size
, 0)
680 && GLRO(dl_verbose
)))
684 strtab
= (const void *) D_PTR (map
, l_info
[DT_STRTAB
]);
686 %s: Symbol `%s' has different size in shared object, consider re-linking\n",
687 RTLD_PROGNAME
, strtab
+ refsym
->st_name
);
689 memcpy (reloc_addr
, (void *) value
,
690 MIN (sym
->st_size
, refsym
->st_size
));
694 #if _MIPS_SIM == _ABI64
696 /* For full compliance with the ELF64 ABI, one must precede the
697 _REL32/_64 pair of relocations with a _64 relocation, such
698 that the in-place addend is read as a 64-bit value. IRIX
699 didn't pick up on this requirement, so we treat the
700 _REL32/_64 relocation as a 64-bit relocation even if it's by
701 itself. For ABI compliance, we ignore such _64 dummy
702 relocations. For RELA, this may be simply removed, since
703 it's totally unnecessary. */
704 if (ELFW(R_SYM
) (r_info
) == 0)
709 _dl_reloc_bad_type (map
, r_type
, 0);
714 /* Perform the relocation specified by RELOC and SYM (which is fully resolved).
715 MAP is the object containing the reloc. */
718 __attribute__ ((always_inline
))
719 elf_machine_rel (struct link_map
*map
, const ElfW(Rel
) *reloc
,
720 const ElfW(Sym
) *sym
, const struct r_found_version
*version
,
721 void *const reloc_addr
, int skip_ifunc
)
723 elf_machine_reloc (map
, reloc
->r_info
, sym
, version
, reloc_addr
, 0, 1);
727 __attribute__((always_inline
))
728 elf_machine_rel_relative (ElfW(Addr
) l_addr
, const ElfW(Rel
) *reloc
,
729 void *const reloc_addr
)
731 /* XXX Nothing to do. There is no relative relocation, right? */
735 __attribute__((always_inline
))
736 elf_machine_lazy_rel (struct link_map
*map
,
737 ElfW(Addr
) l_addr
, const ElfW(Rel
) *reloc
,
740 ElfW(Addr
) *const reloc_addr
= (void *) (l_addr
+ reloc
->r_offset
);
741 const unsigned int r_type
= ELFW(R_TYPE
) (reloc
->r_info
);
742 /* Check for unexpected PLT reloc type. */
743 if (__builtin_expect (r_type
== R_MIPS_JUMP_SLOT
, 1))
745 if (__builtin_expect (map
->l_mach
.plt
, 0) == 0)
747 /* Nothing is required here since we only support lazy
748 relocation in executables. */
751 *reloc_addr
= map
->l_mach
.plt
;
754 _dl_reloc_bad_type (map
, r_type
, 1);
758 __attribute__ ((always_inline
))
759 elf_machine_rela (struct link_map
*map
, const ElfW(Rela
) *reloc
,
760 const ElfW(Sym
) *sym
, const struct r_found_version
*version
,
761 void *const reloc_addr
, int skip_ifunc
)
763 elf_machine_reloc (map
, reloc
->r_info
, sym
, version
, reloc_addr
,
768 __attribute__((always_inline
))
769 elf_machine_rela_relative (ElfW(Addr
) l_addr
, const ElfW(Rela
) *reloc
,
770 void *const reloc_addr
)
774 #ifndef RTLD_BOOTSTRAP
777 __attribute__((always_inline
))
778 elf_machine_got_rel (struct link_map
*map
, int lazy
)
782 const ElfW(Half
) *vernum
;
785 #define RESOLVE_GOTSYM(sym,vernum,sym_index,reloc) \
787 const ElfW(Sym) *ref = sym; \
788 const struct r_found_version *version __attribute__ ((unused)) \
789 = vernum ? &map->l_versions[vernum[sym_index] & 0x7fff] : NULL; \
790 struct link_map *sym_map; \
791 sym_map = RESOLVE_MAP (&ref, version, reloc); \
792 ref ? sym_map->l_addr + ref->st_value : 0; \
795 if (map
->l_info
[VERSYMIDX (DT_VERSYM
)] != NULL
)
796 vernum
= (const void *) D_PTR (map
, l_info
[VERSYMIDX (DT_VERSYM
)]);
800 got
= (ElfW(Addr
) *) D_PTR (map
, l_info
[DT_PLTGOT
]);
802 n
= map
->l_info
[DT_MIPS (LOCAL_GOTNO
)]->d_un
.d_val
;
803 /* The dynamic linker's local got entries have already been relocated. */
804 if (map
!= &GL(dl_rtld_map
))
806 /* got[0] is reserved. got[1] is also reserved for the dynamic object
807 generated by gnu ld. Skip these reserved entries from relocation. */
808 i
= (got
[1] & ELF_MIPS_GNU_GOT1_MASK
)? 2 : 1;
810 /* Add the run-time displacement to all local got entries if
812 if (__builtin_expect (map
->l_addr
!= 0, 0))
815 got
[i
++] += map
->l_addr
;
819 /* Handle global got entries. */
821 /* Keep track of the symbol index. */
822 symidx
= map
->l_info
[DT_MIPS (GOTSYM
)]->d_un
.d_val
;
823 sym
= (ElfW(Sym
) *) D_PTR (map
, l_info
[DT_SYMTAB
]) + symidx
;
824 i
= (map
->l_info
[DT_MIPS (SYMTABNO
)]->d_un
.d_val
825 - map
->l_info
[DT_MIPS (GOTSYM
)]->d_un
.d_val
);
827 /* This loop doesn't handle Quickstart. */
830 if (sym
->st_shndx
== SHN_UNDEF
)
832 if (ELFW(ST_TYPE
) (sym
->st_info
) == STT_FUNC
&& sym
->st_value
833 && !(sym
->st_other
& STO_MIPS_PLT
))
836 *got
= sym
->st_value
+ map
->l_addr
;
838 /* This is a lazy-binding stub, so we don't need the
839 canonical address. */
840 *got
= RESOLVE_GOTSYM (sym
, vernum
, symidx
, R_MIPS_JUMP_SLOT
);
843 *got
= RESOLVE_GOTSYM (sym
, vernum
, symidx
, R_MIPS_32
);
845 else if (sym
->st_shndx
== SHN_COMMON
)
846 *got
= RESOLVE_GOTSYM (sym
, vernum
, symidx
, R_MIPS_32
);
847 else if (ELFW(ST_TYPE
) (sym
->st_info
) == STT_FUNC
848 && *got
!= sym
->st_value
)
853 /* This is a lazy-binding stub, so we don't need the
854 canonical address. */
855 *got
= RESOLVE_GOTSYM (sym
, vernum
, symidx
, R_MIPS_JUMP_SLOT
);
857 else if (ELFW(ST_TYPE
) (sym
->st_info
) == STT_SECTION
)
859 if (sym
->st_other
== 0)
863 *got
= RESOLVE_GOTSYM (sym
, vernum
, symidx
, R_MIPS_32
);
870 #undef RESOLVE_GOTSYM
874 /* Set up the loaded object described by L so its stub function
875 will jump to the on-demand fixup code __dl_runtime_resolve. */
878 __attribute__((always_inline
))
879 elf_machine_runtime_setup (struct link_map
*l
, int lazy
, int profile
)
881 # ifndef RTLD_BOOTSTRAP
883 extern void _dl_runtime_resolve (ElfW(Word
));
884 extern void _dl_runtime_pltresolve (void);
885 extern int _dl_mips_gnu_objects
;
889 /* The GOT entries for functions have not yet been filled in.
890 Their initial contents will arrange when called to put an
891 offset into the .dynsym section in t8, the return address
892 in t7 and then jump to _GLOBAL_OFFSET_TABLE[0]. */
893 got
= (ElfW(Addr
) *) D_PTR (l
, l_info
[DT_PLTGOT
]);
895 /* This function will get called to fix up the GOT entry indicated by
896 the register t8, and then jump to the resolved address. */
897 got
[0] = (ElfW(Addr
)) &_dl_runtime_resolve
;
899 /* Store l to _GLOBAL_OFFSET_TABLE[1] for gnu object. The MSB
900 of got[1] of a gnu object is set to identify gnu objects.
901 Where we can store l for non gnu objects? XXX */
902 if ((got
[1] & ELF_MIPS_GNU_GOT1_MASK
) != 0)
903 got
[1] = ((ElfW(Addr
)) l
| ELF_MIPS_GNU_GOT1_MASK
);
905 _dl_mips_gnu_objects
= 0;
908 /* Relocate global offset table. */
909 elf_machine_got_rel (l
, lazy
);
911 /* If using PLTs, fill in the first two entries of .got.plt. */
912 if (l
->l_info
[DT_JMPREL
] && lazy
)
915 gotplt
= (ElfW(Addr
) *) D_PTR (l
, l_info
[DT_MIPS (PLTGOT
)]);
916 /* If a library is prelinked but we have to relocate anyway,
917 we have to be able to undo the prelinking of .got.plt.
918 The prelinker saved the address of .plt for us here. */
920 l
->l_mach
.plt
= gotplt
[1] + l
->l_addr
;
921 gotplt
[0] = (ElfW(Addr
)) &_dl_runtime_pltresolve
;
922 gotplt
[1] = (ElfW(Addr
)) l
;
929 #endif /* RESOLVE_MAP */