1 /* Machine-dependent ELF dynamic relocation inline functions. SH version.
2 Copyright (C) 1999-2015 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 <http://www.gnu.org/licenses/>. */
22 #define ELF_MACHINE_NAME "SH"
24 #include <sys/param.h>
28 /* Return nonzero iff ELF header is compatible with the running host. */
29 static inline int __attribute__ ((unused
))
30 elf_machine_matches_host (const Elf32_Ehdr
*ehdr
)
32 return ehdr
->e_machine
== EM_SH
;
36 /* Return the link-time address of _DYNAMIC. Conveniently, this is the
37 first element of the GOT. This must be inlined in a function which
39 static inline Elf32_Addr
__attribute__ ((unused
))
40 elf_machine_dynamic (void)
42 register Elf32_Addr
*got
;
43 asm ("mov r12,%0" :"=r" (got
));
48 /* Return the run-time load address of the shared object. */
49 static inline Elf32_Addr
__attribute__ ((unused
))
50 elf_machine_load_address (void)
60 1: .long _dl_start@GOT\n\
61 3: .long _dl_start@GOTOFF\n\
63 : "=r" (addr
) : : "r0", "r1", "r2");
68 /* Set up the loaded object described by L so its unrelocated PLT
69 entries will jump to the on-demand fixup code in dl-runtime.c. */
71 static inline int __attribute__ ((unused
, always_inline
))
72 elf_machine_runtime_setup (struct link_map
*l
, int lazy
, int profile
)
75 extern void _dl_runtime_resolve (Elf32_Word
);
76 extern void _dl_runtime_profile (Elf32_Word
);
78 if (l
->l_info
[DT_JMPREL
] && lazy
)
80 /* The GOT entries for functions in the PLT have not yet been filled
81 in. Their initial contents will arrange when called to load an
82 offset into the .rela.plt section and _GLOBAL_OFFSET_TABLE_[1],
83 and then jump to _GLOBAL_OFFSET_TABLE[2]. */
84 got
= (Elf32_Addr
*) D_PTR (l
, l_info
[DT_PLTGOT
]);
85 /* If a library is prelinked but we have to relocate anyway,
86 we have to be able to undo the prelinking of .got.plt.
87 The prelinker saved us here address of .plt + 36. */
90 l
->l_mach
.plt
= got
[1] + l
->l_addr
;
91 l
->l_mach
.gotplt
= (Elf32_Addr
) &got
[3];
93 got
[1] = (Elf32_Addr
) l
; /* Identify this shared object. */
95 /* The got[2] entry contains the address of a function which gets
96 called to get the address of a so far unresolved function and
97 jump to it. The profiling extension of the dynamic linker allows
98 to intercept the calls to collect information. In this case we
99 don't store the address in the GOT so that all future calls also
100 end in this function. */
103 got
[2] = (Elf32_Addr
) &_dl_runtime_profile
;
104 /* Say that we really want profiling and the timers are started. */
105 if (GLRO(dl_profile
) != NULL
106 && _dl_name_match_p (GLRO(dl_profile
), l
))
107 GL(dl_profile_map
) = l
;
110 /* This function will get called to fix up the GOT entry indicated by
111 the offset on the stack, and then jump to the resolved address. */
112 got
[2] = (Elf32_Addr
) &_dl_runtime_resolve
;
117 #define ELF_MACHINE_RUNTIME_FIXUP_ARGS int plt_type
118 #define ELF_MACHINE_RUNTIME_FIXUP_PARAMS plt_type
120 /* Mask identifying addresses reserved for the user program,
121 where the dynamic linker should not map anything. */
122 #define ELF_MACHINE_USER_ADDRESS_MASK 0x80000000UL
124 /* Initial entry point code for the dynamic linker.
125 The C function `_dl_start' is the real entry point;
126 its return value is the user program's entry point. */
128 #define RTLD_START asm ("\
131 .globl _dl_start_user\n\
134 mov.l .L_dl_start,r1\n\
135 mova .L_dl_start,r0\n\
140 ! Save the user entry point address in r8.\n\
142 ! Point r12 at the GOT.\n\
148 1: .long _GLOBAL_OFFSET_TABLE_\n\
149 2: ! See if we were run as a command with the executable file\n\
150 ! name as an extra leading argument.\n\
151 mov.l .L_dl_skip_args,r0\n\
152 mov.l @(r0,r12),r0\n\
154 ! Get the original argument count.\n\
156 ! Subtract _dl_skip_args from it.\n\
158 ! Adjust the stack pointer to skip _dl_skip_args words.\n\
161 ! Store back the modified argument count.\n\
163 ! Compute argv address and envp.\n\
170 mov.l .L_dl_loaded,r0\n\
171 mov.l @(r0,r12),r0\n\
174 mov.l .L_dl_init,r1\n\
175 mova .L_dl_init,r0\n\
179 1: ! Pass our finalizer function to the user in r4, as per ELF ABI.\n\
180 mov.l .L_dl_fini,r0\n\
181 mov.l @(r0,r12),r4\n\
182 ! Jump to the user's entry point.\n\
187 .long _dl_start@PLT\n\
189 .long _dl_skip_args@GOT\n\
191 .long _dl_init@PLT\n\
193 .long _rtld_local@GOT\n\
195 .long _dl_fini@GOT\n\
196 .type __fpscr_values,@object\n\
197 .global __fpscr_values\n\
201 .weak __fpscr_values\n\
205 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry or
206 TLS variable, so undefined references should not be allowed to
208 ELF_RTYPE_CLASS_COPY iff TYPE should not be allowed to resolve to one
209 of the main executable's symbols, as for a COPY reloc. */
210 #define elf_machine_type_class(type) \
211 ((((type) == R_SH_JMP_SLOT || (type) == R_SH_TLS_DTPMOD32 \
212 || (type) == R_SH_TLS_DTPOFF32 || (type) == R_SH_TLS_TPOFF32) \
213 * ELF_RTYPE_CLASS_PLT) \
214 | (((type) == R_SH_COPY) * ELF_RTYPE_CLASS_COPY))
216 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
217 #define ELF_MACHINE_JMP_SLOT R_SH_JMP_SLOT
219 /* We define an initialization functions. This is called very early in
221 #define DL_PLATFORM_INIT dl_platform_init ()
223 static inline void __attribute__ ((unused
))
224 dl_platform_init (void)
226 if (GLRO(dl_platform
) != NULL
&& *GLRO(dl_platform
) == '\0')
227 /* Avoid an empty string which would disturb us. */
228 GLRO(dl_platform
) = NULL
;
231 static inline Elf32_Addr
232 elf_machine_fixup_plt (struct link_map
*map
, lookup_t t
,
233 const Elf32_Rela
*reloc
,
234 Elf32_Addr
*reloc_addr
, Elf32_Addr value
)
236 return *reloc_addr
= value
;
239 /* Return the final value of a plt relocation. */
240 static inline Elf32_Addr
241 elf_machine_plt_value (struct link_map
*map
, const Elf32_Rela
*reloc
,
244 return value
+ reloc
->r_addend
;
247 #define ARCH_LA_PLTENTER sh_gnu_pltenter
248 #define ARCH_LA_PLTEXIT sh_gnu_pltexit
250 #endif /* !dl_machine_h */
252 /* SH never uses Elf32_Rel relocations. */
253 #define ELF_MACHINE_NO_REL 1
254 #define ELF_MACHINE_NO_RELA 0
258 /* Perform the relocation specified by RELOC and SYM (which is fully resolved).
259 MAP is the object containing the reloc. */
262 __attribute ((always_inline
))
263 elf_machine_rela (struct link_map
*map
, const Elf32_Rela
*reloc
,
264 const Elf32_Sym
*sym
, const struct r_found_version
*version
,
265 void *const reloc_addr_arg
, int skip_ifunc
)
267 Elf32_Addr
*const reloc_addr
= reloc_addr_arg
;
268 const unsigned int r_type
= ELF32_R_TYPE (reloc
->r_info
);
271 #define COPY_UNALIGNED_WORD(swp, twp, align) \
273 void *__s = (swp), *__t = (twp); \
274 unsigned char *__s1 = __s, *__t1 = __t; \
275 unsigned short *__s2 = __s, *__t2 = __t; \
276 unsigned long *__s4 = __s, *__t4 = __t; \
295 if (__glibc_unlikely (r_type
== R_SH_RELATIVE
))
297 #ifndef RTLD_BOOTSTRAP
298 if (map
!= &GL(dl_rtld_map
)) /* Already done in rtld itself. */
302 value
= map
->l_addr
+ reloc
->r_addend
;
305 COPY_UNALIGNED_WORD (reloc_addr_arg
, &value
,
306 (int) reloc_addr_arg
& 3);
307 value
+= map
->l_addr
;
309 COPY_UNALIGNED_WORD (&value
, reloc_addr_arg
,
310 (int) reloc_addr_arg
& 3);
313 #ifndef RTLD_BOOTSTRAP
314 else if (__glibc_unlikely (r_type
== R_SH_NONE
))
319 const Elf32_Sym
*const refsym
= sym
;
320 struct link_map
*sym_map
= RESOLVE_MAP (&sym
, version
, r_type
);
322 value
= sym_map
== NULL
? 0 : sym_map
->l_addr
+ sym
->st_value
;
323 value
+= reloc
->r_addend
;
329 /* This can happen in trace mode if an object could not be
332 if (sym
->st_size
> refsym
->st_size
333 || (sym
->st_size
< refsym
->st_size
&& GLRO(dl_verbose
)))
337 strtab
= (const char *) D_PTR (map
, l_info
[DT_STRTAB
]);
339 %s: Symbol `%s' has different size in shared object, consider re-linking\n",
340 RTLD_PROGNAME
, strtab
+ refsym
->st_name
);
342 memcpy (reloc_addr_arg
, (void *) value
,
343 MIN (sym
->st_size
, refsym
->st_size
));
347 /* These addresses are always aligned. */
350 /* XXX Remove TLS relocations which are not needed. */
351 case R_SH_TLS_DTPMOD32
:
352 #ifdef RTLD_BOOTSTRAP
353 /* During startup the dynamic linker is always the module
355 XXX If this relocation is necessary move before RESOLVE
359 /* Get the information from the link map returned by the
362 *reloc_addr
= sym_map
->l_tls_modid
;
365 case R_SH_TLS_DTPOFF32
:
366 #ifndef RTLD_BOOTSTRAP
367 /* During relocation all TLS symbols are defined and used.
368 Therefore the offset is already correct. */
370 *reloc_addr
= sym
->st_value
;
373 case R_SH_TLS_TPOFF32
:
374 /* The offset is positive, afterward from the thread pointer. */
375 #ifdef RTLD_BOOTSTRAP
376 *reloc_addr
= map
->l_tls_offset
+ sym
->st_value
+ reloc
->r_addend
;
378 /* We know the offset of object the symbol is contained in.
379 It is a positive value which will be added to the thread
380 pointer. To get the variable position in the TLS block
381 we add the offset from that of the TLS block. */
384 CHECK_STATIC_TLS (map
, sym_map
);
385 *reloc_addr
= sym_map
->l_tls_offset
+ sym
->st_value
392 #ifndef RTLD_BOOTSTRAP
393 /* This is defined in rtld.c, but nowhere in the static
394 libc.a; make the reference weak so static programs can
395 still link. This declaration cannot be done when
396 compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP) because
397 rtld.c contains the common defn for _dl_rtld_map, which
398 is incompatible with a weak decl in the same file. */
400 weak_extern (_dl_rtld_map
);
402 if (map
== &GL(dl_rtld_map
))
403 /* Undo the relocation done here during bootstrapping.
404 Now we will relocate it anew, possibly using a
405 binding found in the user program or a loaded library
406 rather than the dynamic linker's built-in definitions
407 used while loading those libraries. */
408 value
-= map
->l_addr
+ refsym
->st_value
+ reloc
->r_addend
;
410 COPY_UNALIGNED_WORD (&value
, reloc_addr_arg
,
411 (int) reloc_addr_arg
& 3);
415 value
= (value
- (Elf32_Addr
) reloc_addr
);
416 COPY_UNALIGNED_WORD (&value
, reloc_addr_arg
,
417 (int) reloc_addr_arg
& 3);
420 _dl_reloc_bad_type (map
, r_type
, 0);
427 __attribute__ ((always_inline
))
428 elf_machine_rela_relative (Elf32_Addr l_addr
, const Elf32_Rela
*reloc
,
429 void *const reloc_addr_arg
)
434 value
= l_addr
+ reloc
->r_addend
;
437 COPY_UNALIGNED_WORD (reloc_addr_arg
, &value
, (int) reloc_addr_arg
& 3);
440 COPY_UNALIGNED_WORD (&value
, reloc_addr_arg
, (int) reloc_addr_arg
& 3);
442 #undef COPY_UNALIGNED_WORD
446 __attribute__ ((always_inline
))
447 elf_machine_lazy_rel (struct link_map
*map
,
448 Elf32_Addr l_addr
, const Elf32_Rela
*reloc
,
451 Elf32_Addr
*const reloc_addr
= (void *) (l_addr
+ reloc
->r_offset
);
452 /* Check for unexpected PLT reloc type. */
453 if (ELF32_R_TYPE (reloc
->r_info
) == R_SH_JMP_SLOT
)
455 if (__builtin_expect (map
->l_mach
.plt
, 0) == 0)
456 *reloc_addr
+= l_addr
;
460 + (((Elf32_Addr
) reloc_addr
) - map
->l_mach
.gotplt
) * 7;
463 _dl_reloc_bad_type (map
, ELF32_R_TYPE (reloc
->r_info
), 1);
466 #endif /* RESOLVE_MAP */