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1 /* Machine-dependent ELF dynamic relocation inline functions. SH version.
2 Copyright (C) 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
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.
9
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.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
18 02111-1307 USA. */
19
20 #ifndef dl_machine_h
21 #define dl_machine_h
22
23 /* Only dummy. This doesn't work. */
24
25 #define ELF_MACHINE_NAME "SH"
26
27 #include <sys/param.h>
28
29 #include <assert.h>
30
31 /* Return nonzero iff ELF header is compatible with the running host. */
32 static inline int __attribute__ ((unused))
33 elf_machine_matches_host (const Elf32_Ehdr *ehdr)
34 {
35 return ehdr->e_machine == EM_SH;
36 }
37
38
39 /* Return the link-time address of _DYNAMIC. Conveniently, this is the
40 first element of the GOT. This must be inlined in a function which
41 uses global data. */
42 static inline Elf32_Addr __attribute__ ((unused))
43 elf_machine_dynamic (void)
44 {
45 register Elf32_Addr *got;
46 asm ("mov r12,%0" :"=r" (got));
47 return *got;
48 }
49
50
51 /* Return the run-time load address of the shared object. */
52 static inline Elf32_Addr __attribute__ ((unused))
53 elf_machine_load_address (void)
54 {
55 Elf32_Addr addr;
56 asm ("mov.l .L1,r0\n\
57 mov.l .L3,r2\n\
58 add r12,r2\n\
59 mov.l @(r0,r12),r0\n\
60 bra .L2\n\
61 sub r0,r2\n\
62 .align 2\n\
63 .L1: .long _dl_start@GOT\n\
64 .L3: .long _dl_start@GOTOFF\n\
65 .L2: mov r2,%0"
66 : "=r" (addr) : : "r0", "r1", "r2");
67 return addr;
68 }
69
70
71 /* Set up the loaded object described by L so its unrelocated PLT
72 entries will jump to the on-demand fixup code in dl-runtime.c. */
73
74 static inline int __attribute__ ((unused))
75 elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
76 {
77 Elf32_Addr *got;
78 extern void _dl_runtime_resolve (Elf32_Word);
79 extern void _dl_runtime_profile (Elf32_Word);
80
81 if (l->l_info[DT_JMPREL] && lazy)
82 {
83 /* The GOT entries for functions in the PLT have not yet been filled
84 in. Their initial contents will arrange when called to load an
85 offset into the .rela.plt section and _GLOBAL_OFFSET_TABLE_[1],
86 and then jump to _GLOBAL_OFFSET_TABLE[2]. */
87 got = (Elf32_Addr *) D_PTR (l, l_info[DT_PLTGOT]);
88 /* If a library is prelinked but we have to relocate anyway,
89 we have to be able to undo the prelinking of .got.plt.
90 The prelinker saved us here address of .plt + 36. */
91 if (got[1])
92 {
93 l->l_mach.plt = got[1] + l->l_addr;
94 l->l_mach.gotplt = (Elf32_Addr) &got[3];
95 }
96 got[1] = (Elf32_Addr) l; /* Identify this shared object. */
97
98 /* The got[2] entry contains the address of a function which gets
99 called to get the address of a so far unresolved function and
100 jump to it. The profiling extension of the dynamic linker allows
101 to intercept the calls to collect information. In this case we
102 don't store the address in the GOT so that all future calls also
103 end in this function. */
104 if (profile)
105 {
106 got[2] = (Elf32_Addr) &_dl_runtime_profile;
107 /* Say that we really want profiling and the timers are started. */
108 GL(dl_profile_map) = l;
109 }
110 else
111 /* This function will get called to fix up the GOT entry indicated by
112 the offset on the stack, and then jump to the resolved address. */
113 got[2] = (Elf32_Addr) &_dl_runtime_resolve;
114 }
115 return lazy;
116 }
117
118 /* This code is used in dl-runtime.c to call the `fixup' function
119 and then redirect to the address it returns. */
120
121 #define ELF_MACHINE_RUNTIME_FIXUP_ARGS int plt_type
122
123 #ifdef SHARED
124 #define FUN_ADDR "\
125 mov.l 1f,r2\n\
126 mova 1f,r0\n\
127 bra 2f\n\
128 add r0,r2 ! Get GOT address in r2\n\
129 0: .align 2\n\
130 1: .long _GLOBAL_OFFSET_TABLE_\n\
131 2: mov.l 3f,r0\n\
132 add r2,r0"
133 #define GOTJMP(x) #x "@GOTOFF"
134 #else
135 #define FUN_ADDR "\
136 mov.l 3f,r0"
137 #define GOTJMP(x) #x
138 #endif
139
140 #ifdef HAVE_FPU
141 #define FGR_SAVE "\
142 sts.l fpscr, @-r15\n\
143 mov #8,r3\n\
144 swap.w r3, r3\n\
145 lds r3, fpscr\n\
146 fmov.s fr11, @-r15\n\
147 fmov.s fr10, @-r15\n\
148 fmov.s fr9, @-r15\n\
149 fmov.s fr8, @-r15\n\
150 fmov.s fr7, @-r15\n\
151 fmov.s fr6, @-r15\n\
152 fmov.s fr5, @-r15\n\
153 fmov.s fr4, @-r15"
154 #define FGR_LOAD "\
155 fmov.s @r15+, fr4\n\
156 fmov.s @r15+, fr5\n\
157 fmov.s @r15+, fr6\n\
158 fmov.s @r15+, fr7\n\
159 fmov.s @r15+, fr8\n\
160 fmov.s @r15+, fr9\n\
161 fmov.s @r15+, fr10\n\
162 fmov.s @r15+, fr11\n\
163 lds.l @r15+, fpscr"
164 #else
165 #define FGR_SAVE ""
166 #define FGR_LOAD ""
167 #endif
168
169 #ifndef PROF
170 # define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
171 .text\n\
172 .globl _dl_runtime_resolve\n\
173 .type _dl_runtime_resolve, @function\n\
174 .align 5\n\
175 _dl_runtime_resolve:\n\
176 mov.l r2,@-r15\n\
177 mov.l r3,@-r15\n\
178 mov.l r4,@-r15\n\
179 mov.l r5,@-r15\n\
180 mov.l r6,@-r15\n\
181 mov.l r7,@-r15\n\
182 mov.l r12,@-r15\n\
183 movt r3 ! Save T flag.\n\
184 mov.l r3,@-r15\n\
185 " FGR_SAVE "\n\
186 sts.l pr,@-r15\n\
187 tst r0,r0\n\
188 bt 1f\n\
189 mov r0,r2\n\
190 1:\n\
191 mov r0,r4 ! PLT type\n\
192 mov r2,r5 ! link map address\n\
193 " FUN_ADDR "\n\
194 jsr @r0 ! Call resolver.\n\
195 mov r1,r6 ! reloc offset\n\
196 lds.l @r15+,pr ! Get register content back.\n\
197 " FGR_LOAD "\n\
198 mov.l @r15+,r3\n\
199 shal r3 ! Lode T flag.\n\
200 mov.l @r15+,r12\n\
201 mov.l @r15+,r7\n\
202 mov.l @r15+,r6\n\
203 mov.l @r15+,r5\n\
204 mov.l @r15+,r4\n\
205 mov.l @r15+,r3\n\
206 jmp @r0 ! Jump to function address.\n\
207 mov.l @r15+,r2\n\
208 .align 2\n\
209 3:\n\
210 .long " GOTJMP (fixup) "\n\
211 .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
212 \n\
213 .globl _dl_runtime_profile\n\
214 .type _dl_runtime_profile, @function\n\
215 .align 5\n\
216 _dl_runtime_profile:\n\
217 mov.l r2,@-r15\n\
218 mov.l r3,@-r15\n\
219 mov.l r4,@-r15\n\
220 mov.l r5,@-r15\n\
221 mov.l r6,@-r15\n\
222 mov.l r7,@-r15\n\
223 mov.l r12,@-r15\n\
224 movt r3 ! Save T flag.\n\
225 mov.l r3,@-r15\n\
226 " FGR_SAVE "\n\
227 sts.l pr,@-r15\n\
228 tst r0,r0\n\
229 bt 1f\n\
230 mov r0,r2\n\
231 1:\n\
232 mov r0,r4 ! PLT type\n\
233 mov r2,r5 ! link map address\n\
234 sts pr,r7 ! return address\n\
235 " FUN_ADDR "\n\
236 jsr @r0 ! Call resolver.\n\
237 mov r1,r6 ! reloc offset\n\
238 lds.l @r15+,pr ! Get register content back.\n\
239 " FGR_LOAD "\n\
240 mov.l @r15+,r3\n\
241 shal r3 ! Lode T flag.\n\
242 mov.l @r15+,r12\n\
243 mov.l @r15+,r7\n\
244 mov.l @r15+,r6\n\
245 mov.l @r15+,r5\n\
246 mov.l @r15+,r4\n\
247 mov.l @r15+,r3\n\
248 jmp @r0 ! Jump to function address.\n\
249 mov.l @r15+,r2\n\
250 .align 2\n\
251 3:\n\
252 .long " GOTJMP (profile_fixup) "\n\
253 .size _dl_runtime_profile, .-_dl_runtime_profile\n\
254 .previous\n\
255 ");
256 #else
257 # define ELF_MACHINE_RUNTIME_TRAMPOLINE asm ("\
258 .text\n\
259 .globl _dl_runtime_resolve\n\
260 .globl _dl_runtime_profile\n\
261 .type _dl_runtime_resolve, @function\n\
262 .type _dl_runtime_profile, @function\n\
263 .align 5\n\
264 _dl_runtime_resolve:\n\
265 _dl_runtime_profile:\n\
266 mov.l r2,@-r15\n\
267 mov.l r3,@-r15\n\
268 mov.l r4,@-r15\n\
269 mov.l r5,@-r15\n\
270 mov.l r6,@-r15\n\
271 mov.l r7,@-r15\n\
272 mov.l r12,@-r15\n\
273 movt r3 ! Save T flag.\n\
274 mov.l r3,@-r15\n\
275 " FGR_SAVE "\n\
276 sts.l pr,@-r15\n\
277 tst r0,r0\n\
278 bt 1f\n\
279 mov r0,r2\n\
280 1:\n\
281 mov r0,r4 ! PLT type\n\
282 mov r2,r5 ! link map address\n\
283 sts pr,r7 ! return address\n\
284 " FUN_ADDR "\n\
285 jsr @r0 ! Call resolver.\n\
286 mov r1,r6 ! reloc offset\n\
287 lds.l @r15+,pr ! Get register content back.\n\
288 " FGR_LOAD "\n\
289 mov.l @r15+,r3\n\
290 shal r3 ! Lode T flag.\n\
291 mov.l @r15+,r12\n\
292 mov.l @r15+,r7\n\
293 mov.l @r15+,r6\n\
294 mov.l @r15+,r5\n\
295 mov.l @r15+,r4\n\
296 mov.l @r15+,r3\n\
297 jmp @r0 ! Jump to function address.\n\
298 mov.l @r15+,r2\n\
299 .align 2\n\
300 3:\n\
301 .long " GOTJMP (fixup) "\n\
302 .size _dl_runtime_resolve, .-_dl_runtime_resolve\n\
303 .size _dl_runtime_profile, .-_dl_runtime_profile\n\
304 .previous\n\
305 ");
306 #endif
307
308 /* Mask identifying addresses reserved for the user program,
309 where the dynamic linker should not map anything. */
310 #define ELF_MACHINE_USER_ADDRESS_MASK 0x80000000UL
311
312 /* Initial entry point code for the dynamic linker.
313 The C function `_dl_start' is the real entry point;
314 its return value is the user program's entry point. */
315
316 #define RTLD_START asm ("\
317 .text\n\
318 .globl _start\n\
319 .globl _dl_start_user\n\
320 _start:\n\
321 mov r15,r4\n\
322 mov.l .L_dl_start,r1\n\
323 mova .L_dl_start,r0\n\
324 add r1,r0\n\
325 jsr @r0\n\
326 nop\n\
327 _dl_start_user:\n\
328 ! Save the user entry point address in r8.\n\
329 mov r0,r8\n\
330 ! Point r12 at the GOT.\n\
331 mov.l 1f,r12\n\
332 mova 1f,r0\n\
333 bra 2f\n\
334 add r0,r12\n\
335 .align 2\n\
336 1: .long _GLOBAL_OFFSET_TABLE_\n\
337 2: ! Store the highest stack address\n\
338 mov.l .L_stack_end,r0\n\
339 mov.l @(r0,r12),r0\n\
340 mov.l r15,@r0\n\
341 ! See if we were run as a command with the executable file\n\
342 ! name as an extra leading argument.\n\
343 mov.l .L_dl_skip_args,r0\n\
344 mov.l @(r0,r12),r0\n\
345 mov.l @r0,r0\n\
346 ! Get the original argument count.\n\
347 mov.l @r15,r5\n\
348 ! Subtract _dl_skip_args from it.\n\
349 sub r0,r5\n\
350 ! Adjust the stack pointer to skip _dl_skip_args words.\n\
351 shll2 r0\n\
352 add r0,r15\n\
353 ! Store back the modified argument count.\n\
354 mov.l r5,@r15\n\
355 ! Compute argv address and envp.\n\
356 mov r15,r6\n\
357 add #4,r6\n\
358 mov r5,r7\n\
359 shll2 r7\n\
360 add r15,r7\n\
361 mov.l .L_dl_loaded,r0\n\
362 mov.l @(r0,r12),r0\n\
363 mov.l @r0,r4\n\
364 ! Call _dl_init.\n\
365 mov.l .L_dl_init,r1\n\
366 mova .L_dl_init,r0\n\
367 add r1,r0\n\
368 jsr @r0\n\
369 nop\n\
370 1: ! Clear the startup flag.\n\
371 mov.l .L_dl_starting_up,r0\n\
372 mov.l @(r0,r12),r0\n\
373 mov #0,r2\n\
374 mov.l r2,@r0\n\
375 ! Pass our finalizer function to the user in r4, as per ELF ABI.\n\
376 mov.l .L_dl_fini,r0\n\
377 mov.l @(r0,r12),r4\n\
378 ! Jump to the user's entry point.\n\
379 jmp @r8\n\
380 nop\n\
381 .align 2\n\
382 .L_dl_start:\n\
383 .long _dl_start@PLT\n\
384 .L_stack_end:\n\
385 .long __libc_stack_end@GOT\n\
386 .L_dl_skip_args:\n\
387 .long _dl_skip_args@GOT\n\
388 .L_dl_init:\n\
389 .long _dl_init@PLT\n\
390 .L_dl_loaded:\n\
391 .long _rtld_global@GOT\n\
392 .L_dl_starting_up:\n\
393 .long _dl_starting_up@GOT\n\
394 .L_dl_fini:\n\
395 .long _dl_fini@GOT\n\
396 .previous\n\
397 ");
398
399 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
400 PLT entries should not be allowed to define the value.
401 ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
402 of the main executable's symbols, as for a COPY reloc. */
403 #define elf_machine_type_class(type) \
404 ((((type) == R_SH_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
405 | (((type) == R_SH_COPY) * ELF_RTYPE_CLASS_COPY))
406
407 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
408 #define ELF_MACHINE_JMP_SLOT R_SH_JMP_SLOT
409
410 /* We define an initialization functions. This is called very early in
411 _dl_sysdep_start. */
412 #define DL_PLATFORM_INIT dl_platform_init ()
413
414 static inline void __attribute__ ((unused))
415 dl_platform_init (void)
416 {
417 if (GL(dl_platform) != NULL && *GL(dl_platform) == '\0')
418 /* Avoid an empty string which would disturb us. */
419 GL(dl_platform) = NULL;
420 }
421
422 static inline Elf32_Addr
423 elf_machine_fixup_plt (struct link_map *map, lookup_t t,
424 const Elf32_Rela *reloc,
425 Elf32_Addr *reloc_addr, Elf32_Addr value)
426 {
427 return *reloc_addr = value;
428 }
429
430 /* Return the final value of a plt relocation. */
431 static inline Elf32_Addr
432 elf_machine_plt_value (struct link_map *map, const Elf32_Rela *reloc,
433 Elf32_Addr value)
434 {
435 return value + reloc->r_addend;
436 }
437
438 #endif /* !dl_machine_h */
439
440 #ifdef RESOLVE
441
442 /* SH never uses Elf32_Rel relocations. */
443 #define ELF_MACHINE_NO_REL 1
444
445 extern char **_dl_argv;
446
447 /* Perform the relocation specified by RELOC and SYM (which is fully resolved).
448 MAP is the object containing the reloc. */
449
450 static inline void
451 elf_machine_rela (struct link_map *map, const Elf32_Rela *reloc,
452 const Elf32_Sym *sym, const struct r_found_version *version,
453 Elf32_Addr *const reloc_addr)
454 {
455 const unsigned int r_type = ELF32_R_TYPE (reloc->r_info);
456 Elf32_Addr value;
457
458 #define COPY_UNALIGNED_WORD(sw, tw, align) \
459 { \
460 void *__s = &(sw), *__t = &(tw); \
461 switch ((align)) \
462 { \
463 case 0: \
464 *(unsigned long *) __t = *(unsigned long *) __s; \
465 break; \
466 case 2: \
467 *((unsigned short *) __t)++ = *((unsigned short *) __s)++; \
468 *((unsigned short *) __t) = *((unsigned short *) __s); \
469 break; \
470 default: \
471 *((unsigned char *) __t)++ = *((unsigned char *) __s)++; \
472 *((unsigned char *) __t)++ = *((unsigned char *) __s)++; \
473 *((unsigned char *) __t)++ = *((unsigned char *) __s)++; \
474 *((unsigned char *) __t) = *((unsigned char *) __s); \
475 break; \
476 } \
477 }
478
479 if (__builtin_expect (r_type == R_SH_RELATIVE, 0))
480 {
481 #ifndef RTLD_BOOTSTRAP
482 if (map != &GL(dl_rtld_map)) /* Already done in rtld itself. */
483 #endif
484 {
485 if (reloc->r_addend)
486 value = map->l_addr + reloc->r_addend;
487 else
488 {
489 COPY_UNALIGNED_WORD (*reloc_addr, value, (int) reloc_addr & 3);
490 value += map->l_addr;
491 }
492 COPY_UNALIGNED_WORD (value, *reloc_addr, (int) reloc_addr & 3);
493 }
494 }
495 #ifndef RTLD_BOOTSTRAP
496 else if (__builtin_expect (r_type == R_SH_NONE, 0))
497 return;
498 #endif
499 else
500 {
501 const Elf32_Sym *const refsym = sym;
502
503 value = RESOLVE (&sym, version, ELF32_R_TYPE (reloc->r_info));
504 if (sym)
505 value += sym->st_value;
506 value += reloc->r_addend;
507
508 switch (ELF32_R_TYPE (reloc->r_info))
509 {
510 case R_SH_COPY:
511 if (sym == NULL)
512 /* This can happen in trace mode if an object could not be
513 found. */
514 break;
515 if (sym->st_size > refsym->st_size
516 || (sym->st_size < erefsym->st_size && GL(dl_verbose)))
517 {
518 const char *strtab;
519
520 strtab = (const char *) D_PTR (map, l_info[DT_STRTAB]);
521 _dl_error_printf ("\
522 %s: Symbol `%s' has different size in shared object, consider re-linking\n",
523 _dl_argv[0] ?: "<program name unknown>",
524 strtab + refsym->st_name);
525 }
526 memcpy (reloc_addr, (void *) value, MIN (sym->st_size,
527 refsym->st_size));
528 break;
529 case R_SH_GLOB_DAT:
530 case R_SH_JMP_SLOT:
531 /* These addresses are always aligned. */
532 *reloc_addr = value;
533 break;
534 case R_SH_DIR32:
535 {
536 #ifndef RTLD_BOOTSTRAP
537 /* This is defined in rtld.c, but nowhere in the static
538 libc.a; make the reference weak so static programs can
539 still link. This declaration cannot be done when
540 compiling rtld.c (i.e. #ifdef RTLD_BOOTSTRAP) because
541 rtld.c contains the common defn for _dl_rtld_map, which
542 is incompatible with a weak decl in the same file. */
543 # ifndef SHARED
544 weak_extern (GL(dl_rtld_map));
545 # endif
546 if (map == &GL(dl_rtld_map))
547 /* Undo the relocation done here during bootstrapping.
548 Now we will relocate it anew, possibly using a
549 binding found in the user program or a loaded library
550 rather than the dynamic linker's built-in definitions
551 used while loading those libraries. */
552 value -= map->l_addr + refsym->st_value + reloc->r_addend;
553 #endif
554 COPY_UNALIGNED_WORD (value, *reloc_addr, (int) reloc_addr & 3);
555 break;
556 }
557 case R_SH_REL32:
558 value = (value - (Elf32_Addr) reloc_addr);
559 COPY_UNALIGNED_WORD (value, *reloc_addr, (int) reloc_addr & 3);
560 break;
561 default:
562 _dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 0);
563 break;
564 }
565 }
566 }
567
568 static inline void
569 elf_machine_rela_relative (Elf32_Addr l_addr, const Elf32_Rela *reloc,
570 Elf32_Addr *const reloc_addr)
571 {
572 Elf32_Addr value;
573
574 if (reloc->r_addend)
575 value = l_addr + reloc->r_addend;
576 else
577 {
578 COPY_UNALIGNED_WORD (*reloc_addr, value, (int) reloc_addr & 3);
579 value += l_addr;
580 }
581 COPY_UNALIGNED_WORD (value, *reloc_addr, (int) reloc_addr & 3);
582
583 #undef COPY_UNALIGNED_WORD
584 }
585
586 static inline void
587 elf_machine_lazy_rel (struct link_map *map,
588 Elf32_Addr l_addr, const Elf32_Rela *reloc)
589 {
590 Elf32_Addr *const reloc_addr = (void *) (l_addr + reloc->r_offset);
591 /* Check for unexpected PLT reloc type. */
592 if (ELF32_R_TYPE (reloc->r_info) == R_SH_JMP_SLOT)
593 {
594 if (__builtin_expect (map->l_mach.plt, 0) == 0)
595 *reloc_addr += l_addr;
596 else
597 *reloc_addr =
598 map->l_mach.plt
599 + (((Elf32_Addr) reloc_addr) - map->l_mach.gotplt) * 7;
600 }
601 else
602 _dl_reloc_bad_type (map, ELF32_R_TYPE (reloc->r_info), 1);
603 }
604
605 #endif /* RESOLVE */
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