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* elf/dynamic-link.h (elf_machine_rel, elf_machine_rela, elf_machine_rel_relative...
[glibc.git] / sysdeps / sparc / sparc64 / dl-machine.h
blob5d87b4cb678620014af7bb2064b757c829b26637
1 /* Machine-dependent ELF dynamic relocation inline functions. Sparc64 version.
2 Copyright (C) 1997,1998,1999,2000,2001,2002, 2003
3 Free Software Foundation, Inc.
4 This file is part of the GNU C Library.
5
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.
10
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.
15
16 You should have received a copy of the GNU Lesser General Public
17 License along with the GNU C Library; if not, write to the Free
18 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
19 02111-1307 USA. */
20
21 #define ELF_MACHINE_NAME "sparc64"
22
23 #include <string.h>
24 #include <sys/param.h>
25 #include <ldsodefs.h>
26 #include <sysdep.h>
27
28 #ifndef VALIDX
29 # define VALIDX(tag) (DT_NUM + DT_THISPROCNUM + DT_VERSIONTAGNUM \
30 + DT_EXTRANUM + DT_VALTAGIDX (tag))
31 #endif
32
33 #define ELF64_R_TYPE_ID(info) ((info) & 0xff)
34 #define ELF64_R_TYPE_DATA(info) ((info) >> 8)
35
36 /* Return nonzero iff ELF header is compatible with the running host. */
37 static inline int
38 elf_machine_matches_host (const Elf64_Ehdr *ehdr)
39 {
40 return ehdr->e_machine == EM_SPARCV9;
41 }
42
43 /* We have to do this because elf_machine_{dynamic,load_address} can be
44 invoked from functions that have no GOT references, and thus the compiler
45 has no obligation to load the PIC register. */
46 #define LOAD_PIC_REG(PIC_REG) \
47 do { Elf64_Addr tmp; \
48 __asm("sethi %%hi(_GLOBAL_OFFSET_TABLE_-4), %1\n\t" \
49 "rd %%pc, %0\n\t" \
50 "add %1, %%lo(_GLOBAL_OFFSET_TABLE_+4), %1\n\t" \
51 "add %0, %1, %0" \
52 : "=r" (PIC_REG), "=r" (tmp)); \
53 } while (0)
54
55 /* Return the link-time address of _DYNAMIC. Conveniently, this is the
56 first element of the GOT. This must be inlined in a function which
57 uses global data. */
58 static inline Elf64_Addr
59 elf_machine_dynamic (void)
60 {
61 register Elf64_Addr *elf_pic_register __asm__("%l7");
62
63 LOAD_PIC_REG (elf_pic_register);
64
65 return *elf_pic_register;
66 }
67
68 /* Return the run-time load address of the shared object. */
69 static inline Elf64_Addr
70 elf_machine_load_address (void)
71 {
72 register Elf32_Addr *pc __asm ("%o7");
73 register Elf64_Addr *got __asm ("%l7");
74
75 __asm ("sethi %%hi(_GLOBAL_OFFSET_TABLE_-4), %1\n\t"
76 "call 1f\n\t"
77 " add %1, %%lo(_GLOBAL_OFFSET_TABLE_+4), %1\n\t"
78 "call _DYNAMIC\n\t"
79 "call _GLOBAL_OFFSET_TABLE_\n"
80 "1:\tadd %1, %0, %1\n\t" : "=r" (pc), "=r" (got));
81
82 /* got is now l_addr + _GLOBAL_OFFSET_TABLE_
83 *got is _DYNAMIC
84 pc[2]*4 is l_addr + _DYNAMIC - (long)pc - 8
85 pc[3]*4 is l_addr + _GLOBAL_OFFSET_TABLE_ - (long)pc - 12 */
86 return (Elf64_Addr) got - *got + (Elf32_Sword) ((pc[2] - pc[3]) * 4) - 4;
87 }
88
89 /* We have 4 cases to handle. And we code different code sequences
90 for each one. I love V9 code models... */
91 static inline void
92 sparc64_fixup_plt (struct link_map *map, const Elf64_Rela *reloc,
93 Elf64_Addr *reloc_addr, Elf64_Addr value,
94 Elf64_Addr high, int t)
95 {
96 unsigned int *insns = (unsigned int *) reloc_addr;
97 Elf64_Addr plt_vaddr = (Elf64_Addr) reloc_addr;
98 Elf64_Sxword disp = value - plt_vaddr;
99
100 /* Now move plt_vaddr up to the call instruction. */
101 plt_vaddr += ((t + 1) * 4);
102
103 /* PLT entries .PLT32768 and above look always the same. */
104 if (__builtin_expect (high, 0) != 0)
105 {
106 *reloc_addr = value - map->l_addr;
107 }
108 /* Near destination. */
109 else if (disp >= -0x800000 && disp < 0x800000)
110 {
111 /* As this is just one instruction, it is thread safe and so
112 we can avoid the unnecessary sethi FOO, %g1.
113 b,a target */
114 insns[0] = 0x30800000 | ((disp >> 2) & 0x3fffff);
115 __asm __volatile ("flush %0" : : "r" (insns));
116 }
117 /* 32-bit Sparc style, the target is in the lower 32-bits of
118 address space. */
119 else if (insns += t, (value >> 32) == 0)
120 {
121 /* sethi %hi(target), %g1
122 jmpl %g1 + %lo(target), %g0 */
123
124 insns[1] = 0x81c06000 | (value & 0x3ff);
125 __asm __volatile ("flush %0 + 4" : : "r" (insns));
126
127 insns[0] = 0x03000000 | ((unsigned int)(value >> 10));
128 __asm __volatile ("flush %0" : : "r" (insns));
129 }
130 /* We can also get somewhat simple sequences if the distance between
131 the target and the PLT entry is within +/- 2GB. */
132 else if ((plt_vaddr > value
133 && ((plt_vaddr - value) >> 31) == 0)
134 || (value > plt_vaddr
135 && ((value - plt_vaddr) >> 31) == 0))
136 {
137 unsigned int displacement;
138
139 if (plt_vaddr > value)
140 displacement = (0 - (plt_vaddr - value));
141 else
142 displacement = value - plt_vaddr;
143
144 /* mov %o7, %g1
145 call displacement
146 mov %g1, %o7 */
147
148 insns[2] = 0x9e100001;
149 __asm __volatile ("flush %0 + 8" : : "r" (insns));
150
151 insns[1] = 0x40000000 | (displacement >> 2);
152 __asm __volatile ("flush %0 + 4" : : "r" (insns));
153
154 insns[0] = 0x8210000f;
155 __asm __volatile ("flush %0" : : "r" (insns));
156 }
157 /* Worst case, ho hum... */
158 else
159 {
160 unsigned int high32 = (value >> 32);
161 unsigned int low32 = (unsigned int) value;
162
163 /* ??? Some tricks can be stolen from the sparc64 egcs backend
164 constant formation code I wrote. -DaveM */
165
166 if (__builtin_expect (high32 & 0x3ff, 0))
167 {
168 /* sethi %hh(value), %g1
169 sethi %lm(value), %g5
170 or %g1, %hm(value), %g1
171 or %g5, %lo(value), %g5
172 sllx %g1, 32, %g1
173 jmpl %g1 + %g5, %g0
174 nop */
175
176 insns[5] = 0x81c04005;
177 __asm __volatile ("flush %0 + 20" : : "r" (insns));
178
179 insns[4] = 0x83287020;
180 __asm __volatile ("flush %0 + 16" : : "r" (insns));
181
182 insns[3] = 0x8a116000 | (low32 & 0x3ff);
183 __asm __volatile ("flush %0 + 12" : : "r" (insns));
184
185 insns[2] = 0x82106000 | (high32 & 0x3ff);
186 }
187 else
188 {
189 /* sethi %hh(value), %g1
190 sethi %lm(value), %g5
191 sllx %g1, 32, %g1
192 or %g5, %lo(value), %g5
193 jmpl %g1 + %g5, %g0
194 nop */
195
196 insns[4] = 0x81c04005;
197 __asm __volatile ("flush %0 + 16" : : "r" (insns));
198
199 insns[3] = 0x8a116000 | (low32 & 0x3ff);
200 __asm __volatile ("flush %0 + 12" : : "r" (insns));
201
202 insns[2] = 0x83287020;
203 }
204
205 __asm __volatile ("flush %0 + 8" : : "r" (insns));
206
207 insns[1] = 0x0b000000 | (low32 >> 10);
208 __asm __volatile ("flush %0 + 4" : : "r" (insns));
209
210 insns[0] = 0x03000000 | (high32 >> 10);
211 __asm __volatile ("flush %0" : : "r" (insns));
212 }
213 }
214
215 static inline Elf64_Addr
216 elf_machine_fixup_plt (struct link_map *map, lookup_t t,
217 const Elf64_Rela *reloc,
218 Elf64_Addr *reloc_addr, Elf64_Addr value)
219 {
220 sparc64_fixup_plt (map, reloc, reloc_addr, value + reloc->r_addend,
221 reloc->r_addend, 1);
222 return value;
223 }
224
225 /* Return the final value of a plt relocation. */
226 static inline Elf64_Addr
227 elf_machine_plt_value (struct link_map *map, const Elf64_Rela *reloc,
228 Elf64_Addr value)
229 {
230 /* Don't add addend here, but in elf_machine_fixup_plt instead.
231 value + reloc->r_addend is the value which should actually be
232 stored into .plt data slot. */
233 return value;
234 }
235
236 #ifdef RESOLVE
237
238 /* Perform the relocation specified by RELOC and SYM (which is fully resolved).
239 MAP is the object containing the reloc. */
240
241 static inline void
242 elf_machine_rela (struct link_map *map, const Elf64_Rela *reloc,
243 const Elf64_Sym *sym, const struct r_found_version *version,
244 void *const reloc_addr_arg)
245 {
246 Elf64_Addr *const reloc_addr = reloc_addr_arg;
247 const unsigned long int r_type = ELF64_R_TYPE_ID (reloc->r_info);
248
249 #if !defined RTLD_BOOTSTRAP || !defined HAVE_Z_COMBRELOC
250 if (__builtin_expect (r_type == R_SPARC_RELATIVE, 0))
251 *reloc_addr = map->l_addr + reloc->r_addend;
252 # ifndef RTLD_BOOTSTRAP
253 else if (r_type == R_SPARC_NONE) /* Who is Wilbur? */
254 return;
255 # endif
256 else
257 #endif
258 {
259 #if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP
260 const Elf64_Sym *const refsym = sym;
261 #endif
262 Elf64_Addr value;
263 #ifndef RESOLVE_CONFLICT_FIND_MAP
264 if (sym->st_shndx != SHN_UNDEF &&
265 ELF64_ST_BIND (sym->st_info) == STB_LOCAL)
266 value = map->l_addr;
267 else
268 {
269 value = RESOLVE (&sym, version, r_type);
270 if (sym)
271 value += sym->st_value;
272 }
273 #else
274 value = 0;
275 #endif
276 value += reloc->r_addend; /* Assume copy relocs have zero addend. */
277
278 switch (r_type)
279 {
280 #if !defined RTLD_BOOTSTRAP && !defined RESOLVE_CONFLICT_FIND_MAP
281 case R_SPARC_COPY:
282 if (sym == NULL)
283 /* This can happen in trace mode if an object could not be
284 found. */
285 break;
286 if (sym->st_size > refsym->st_size
287 || (GL(dl_verbose) && sym->st_size < refsym->st_size))
288 {
289 const char *strtab;
290
291 strtab = (const void *) D_PTR (map, l_info[DT_STRTAB]);
292 _dl_error_printf ("\
293 %s: Symbol `%s' has different size in shared object, consider re-linking\n",
294 rtld_progname ?: "<program name unknown>",
295 strtab + refsym->st_name);
296 }
297 memcpy (reloc_addr_arg, (void *) value,
298 MIN (sym->st_size, refsym->st_size));
299 break;
300 #endif
301 case R_SPARC_64:
302 case R_SPARC_GLOB_DAT:
303 *reloc_addr = value;
304 break;
305 #ifndef RTLD_BOOTSTRAP
306 case R_SPARC_8:
307 *(char *) reloc_addr = value;
308 break;
309 case R_SPARC_16:
310 *(short *) reloc_addr = value;
311 break;
312 case R_SPARC_32:
313 *(unsigned int *) reloc_addr = value;
314 break;
315 case R_SPARC_DISP8:
316 *(char *) reloc_addr = (value - (Elf64_Addr) reloc_addr);
317 break;
318 case R_SPARC_DISP16:
319 *(short *) reloc_addr = (value - (Elf64_Addr) reloc_addr);
320 break;
321 case R_SPARC_DISP32:
322 *(unsigned int *) reloc_addr = (value - (Elf64_Addr) reloc_addr);
323 break;
324 case R_SPARC_WDISP30:
325 *(unsigned int *) reloc_addr =
326 ((*(unsigned int *)reloc_addr & 0xc0000000) |
327 ((value - (Elf64_Addr) reloc_addr) >> 2));
328 break;
329
330 /* MEDLOW code model relocs */
331 case R_SPARC_LO10:
332 *(unsigned int *) reloc_addr =
333 ((*(unsigned int *)reloc_addr & ~0x3ff) |
334 (value & 0x3ff));
335 break;
336 case R_SPARC_HI22:
337 *(unsigned int *) reloc_addr =
338 ((*(unsigned int *)reloc_addr & 0xffc00000) |
339 (value >> 10));
340 break;
341 case R_SPARC_OLO10:
342 *(unsigned int *) reloc_addr =
343 ((*(unsigned int *)reloc_addr & ~0x1fff) |
344 (((value & 0x3ff) + ELF64_R_TYPE_DATA (reloc->r_info)) & 0x1fff));
345 break;
346
347 /* MEDMID code model relocs */
348 case R_SPARC_H44:
349 *(unsigned int *) reloc_addr =
350 ((*(unsigned int *)reloc_addr & 0xffc00000) |
351 (value >> 22));
352 break;
353 case R_SPARC_M44:
354 *(unsigned int *) reloc_addr =
355 ((*(unsigned int *)reloc_addr & ~0x3ff) |
356 ((value >> 12) & 0x3ff));
357 break;
358 case R_SPARC_L44:
359 *(unsigned int *) reloc_addr =
360 ((*(unsigned int *)reloc_addr & ~0xfff) |
361 (value & 0xfff));
362 break;
363
364 /* MEDANY code model relocs */
365 case R_SPARC_HH22:
366 *(unsigned int *) reloc_addr =
367 ((*(unsigned int *)reloc_addr & 0xffc00000) |
368 (value >> 42));
369 break;
370 case R_SPARC_HM10:
371 *(unsigned int *) reloc_addr =
372 ((*(unsigned int *)reloc_addr & ~0x3ff) |
373 ((value >> 32) & 0x3ff));
374 break;
375 case R_SPARC_LM22:
376 *(unsigned int *) reloc_addr =
377 ((*(unsigned int *)reloc_addr & 0xffc00000) |
378 ((value >> 10) & 0x003fffff));
379 break;
380 #endif
381 case R_SPARC_JMP_SLOT:
382 #ifdef RESOLVE_CONFLICT_FIND_MAP
383 /* R_SPARC_JMP_SLOT conflicts against .plt[32768+]
384 relocs should be turned into R_SPARC_64 relocs
385 in .gnu.conflict section.
386 r_addend non-zero does not mean it is a .plt[32768+]
387 reloc, instead it is the actual address of the function
388 to call. */
389 sparc64_fixup_plt (NULL, reloc, reloc_addr, value, 0, 0);
390 #else
391 sparc64_fixup_plt (map, reloc, reloc_addr, value,
392 reloc->r_addend, 0);
393 #endif
394 break;
395 #ifndef RTLD_BOOTSTRAP
396 case R_SPARC_UA16:
397 ((unsigned char *) reloc_addr_arg) [0] = value >> 8;
398 ((unsigned char *) reloc_addr_arg) [1] = value;
399 break;
400 case R_SPARC_UA32:
401 ((unsigned char *) reloc_addr_arg) [0] = value >> 24;
402 ((unsigned char *) reloc_addr_arg) [1] = value >> 16;
403 ((unsigned char *) reloc_addr_arg) [2] = value >> 8;
404 ((unsigned char *) reloc_addr_arg) [3] = value;
405 break;
406 case R_SPARC_UA64:
407 if (! ((long) reloc_addr_arg & 3))
408 {
409 /* Common in .eh_frame */
410 ((unsigned int *) reloc_addr_arg) [0] = value >> 32;
411 ((unsigned int *) reloc_addr_arg) [1] = value;
412 break;
413 }
414 ((unsigned char *) reloc_addr_arg) [0] = value >> 56;
415 ((unsigned char *) reloc_addr_arg) [1] = value >> 48;
416 ((unsigned char *) reloc_addr_arg) [2] = value >> 40;
417 ((unsigned char *) reloc_addr_arg) [3] = value >> 32;
418 ((unsigned char *) reloc_addr_arg) [4] = value >> 24;
419 ((unsigned char *) reloc_addr_arg) [5] = value >> 16;
420 ((unsigned char *) reloc_addr_arg) [6] = value >> 8;
421 ((unsigned char *) reloc_addr_arg) [7] = value;
422 break;
423 #endif
424 #if !defined RTLD_BOOTSTRAP || defined _NDEBUG
425 default:
426 _dl_reloc_bad_type (map, r_type, 0);
427 break;
428 #endif
429 }
430 }
431 }
432
433 static inline void
434 elf_machine_rela_relative (Elf64_Addr l_addr, const Elf64_Rela *reloc,
435 void *const reloc_addr_arg)
436 {
437 Elf64_Addr *const reloc_addr = reloc_addr_arg;
438 *reloc_addr = l_addr + reloc->r_addend;
439 }
440
441 static inline void
442 elf_machine_lazy_rel (struct link_map *map,
443 Elf64_Addr l_addr, const Elf64_Rela *reloc)
444 {
445 switch (ELF64_R_TYPE (reloc->r_info))
446 {
447 case R_SPARC_NONE:
448 break;
449 case R_SPARC_JMP_SLOT:
450 break;
451 default:
452 _dl_reloc_bad_type (map, ELFW(R_TYPE) (reloc->r_info), 1);
453 break;
454 }
455 }
456
457 #endif /* RESOLVE */
458
459 /* ELF_RTYPE_CLASS_PLT iff TYPE describes relocation of a PLT entry, so
460 PLT entries should not be allowed to define the value.
461 ELF_RTYPE_CLASS_NOCOPY iff TYPE should not be allowed to resolve to one
462 of the main executable's symbols, as for a COPY reloc. */
463 #define elf_machine_type_class(type) \
464 ((((type) == R_SPARC_JMP_SLOT) * ELF_RTYPE_CLASS_PLT) \
465 | (((type) == R_SPARC_COPY) * ELF_RTYPE_CLASS_COPY))
466
467 /* A reloc type used for ld.so cmdline arg lookups to reject PLT entries. */
468 #define ELF_MACHINE_JMP_SLOT R_SPARC_JMP_SLOT
469
470 /* The SPARC never uses Elf64_Rel relocations. */
471 #define ELF_MACHINE_NO_REL 1
472
473 /* The SPARC overlaps DT_RELA and DT_PLTREL. */
474 #define ELF_MACHINE_PLTREL_OVERLAP 1
475
476 /* Set up the loaded object described by L so its unrelocated PLT
477 entries will jump to the on-demand fixup code in dl-runtime.c. */
478
479 static inline int
480 elf_machine_runtime_setup (struct link_map *l, int lazy, int profile)
481 {
482 if (l->l_info[DT_JMPREL] && lazy)
483 {
484 extern void _dl_runtime_resolve_0 (void);
485 extern void _dl_runtime_resolve_1 (void);
486 extern void _dl_runtime_profile_0 (void);
487 extern void _dl_runtime_profile_1 (void);
488 Elf64_Addr res0_addr, res1_addr;
489 unsigned int *plt = (void *) D_PTR (l, l_info[DT_PLTGOT]);
490 int i = 0;
491
492 if (! profile)
493 {
494 res0_addr = (Elf64_Addr) &_dl_runtime_resolve_0;
495 res1_addr = (Elf64_Addr) &_dl_runtime_resolve_1;
496 }
497 else
498 {
499 res0_addr = (Elf64_Addr) &_dl_runtime_profile_0;
500 res1_addr = (Elf64_Addr) &_dl_runtime_profile_1;
501 if (_dl_name_match_p (GL(dl_profile), l))
502 GL(dl_profile_map) = l;
503 }
504
505 /* PLT0 looks like:
506
507 save %sp, -192, %sp
508 sethi %hh(_dl_runtime_{resolve,profile}_0), %l0
509 sethi %lm(_dl_runtime_{resolve,profile}_0), %l1
510 or %l0, %hm(_dl_runtime_{resolve,profile}_0), %l0
511 or %l1, %lo(_dl_runtime_{resolve,profile}_0), %l1
512 sllx %l0, 32, %l0
513 jmpl %l0 + %l1, %l6
514 sethi %hi(0xffc00), %l2
515 */
516
517 plt[0] = 0x9de3bf40;
518 plt[1] = 0x21000000 | (res0_addr >> (64 - 22));
519 plt[2] = 0x23000000 | ((res0_addr >> 10) & 0x003fffff);
520 plt[3] = 0xa0142000 | ((res0_addr >> 32) & 0x3ff);
521 plt[4] = 0xa2146000 | (res0_addr & 0x3ff);
522 plt[5] = 0xa12c3020;
523 plt[6] = 0xadc40011;
524 plt[7] = 0x250003ff;
525
526 /* PLT1 looks like:
527
528 save %sp, -192, %sp
529 sethi %hh(_dl_runtime_{resolve,profile}_1), %l0
530 sethi %lm(_dl_runtime_{resolve,profile}_1), %l1
531 or %l0, %hm(_dl_runtime_{resolve,profile}_1), %l0
532 or %l1, %lo(_dl_runtime_{resolve,profile}_1), %l1
533 sllx %l0, 32, %l0
534 jmpl %l0 + %l1, %l6
535 srlx %g1, 12, %o1
536 */
537
538 plt[8 + 0] = 0x9de3bf40;
539 if (__builtin_expect (((res1_addr + 4) >> 32) & 0x3ff, 0))
540 i = 1;
541 else
542 res1_addr += 4;
543 plt[8 + 1] = 0x21000000 | (res1_addr >> (64 - 22));
544 plt[8 + 2] = 0x23000000 | ((res1_addr >> 10) & 0x003fffff);
545 if (__builtin_expect (i, 0))
546 plt[8 + 3] = 0xa0142000 | ((res1_addr >> 32) & 0x3ff);
547 else
548 plt[8 + 3] = 0xa12c3020;
549 plt[8 + 4] = 0xa2146000 | (res1_addr & 0x3ff);
550 if (__builtin_expect (i, 0))
551 plt[8 + 5] = 0xa12c3020;
552 plt[8 + 5 + i] = 0xadc40011;
553 plt[8 + 6 + i] = 0x9330700c;
554
555 /* Now put the magic cookie at the beginning of .PLT2
556 Entry .PLT3 is unused by this implementation. */
557 *((struct link_map **)(&plt[16 + 0])) = l;
558
559 if (__builtin_expect (l->l_info[VALIDX(DT_GNU_PRELINKED)] != NULL, 0)
560 || __builtin_expect (l->l_info [VALIDX (DT_GNU_LIBLISTSZ)] != NULL, 0))
561 {
562 /* Need to reinitialize .plt to undo prelinking. */
563 Elf64_Rela *rela = (Elf64_Rela *) D_PTR (l, l_info[DT_JMPREL]);
564 Elf64_Rela *relaend
565 = (Elf64_Rela *) ((char *) rela
566 + l->l_info[DT_PLTRELSZ]->d_un.d_val);
567
568 /* prelink must ensure there are no R_SPARC_NONE relocs left
569 in .rela.plt. */
570 while (rela < relaend)
571 {
572 if (__builtin_expect (rela->r_addend, 0) != 0)
573 {
574 Elf64_Addr slot = ((rela->r_offset + 0x400
575 - (Elf64_Addr) plt)
576 / 0x1400) * 0x1400
577 + (Elf64_Addr) plt - 0x400;
578 /* ldx [%o7 + X], %g1 */
579 unsigned int first_ldx = *(unsigned int *)(slot + 12);
580 Elf64_Addr ptr = slot + (first_ldx & 0xfff) + 4;
581
582 *(Elf64_Addr *) rela->r_offset
583 = (Elf64_Addr) plt
584 - (slot + ((rela->r_offset - ptr) / 8) * 24 + 4);
585 ++rela;
586 continue;
587 }
588
589 *(unsigned int *) rela->r_offset
590 = 0x03000000 | (rela->r_offset - (Elf64_Addr) plt);
591 *(unsigned int *) (rela->r_offset + 4)
592 = 0x30680000 | ((((Elf64_Addr) plt + 32
593 - rela->r_offset - 4) >> 2) & 0x7ffff);
594 __asm __volatile ("flush %0" : : "r" (rela->r_offset));
595 __asm __volatile ("flush %0+4" : : "r" (rela->r_offset));
596 ++rela;
597 }
598 }
599 }
600
601 return lazy;
602 }
603
604 /* This code is used in dl-runtime.c to call the `fixup' function
605 and then redirect to the address it returns. */
606 #define TRAMPOLINE_TEMPLATE(tramp_name, fixup_name) \
607 asm ("\n" \
608 " .text\n" \
609 " .globl " #tramp_name "_0\n" \
610 " .type " #tramp_name "_0, @function\n" \
611 " .align 32\n" \
612 "\t" #tramp_name "_0:\n" \
613 " ! sethi %hi(1047552), %l2 - Done in .PLT0\n" \
614 " ldx [%l6 + 32 + 8], %o0\n" \
615 " sub %g1, %l6, %l0\n" \
616 " xor %l2, -1016, %l2\n" \
617 " sethi %hi(5120), %l3 ! 160 * 32\n" \
618 " add %l0, %l2, %l0\n" \
619 " sethi %hi(32768), %l4\n" \
620 " udivx %l0, %l3, %l3\n" \
621 " sllx %l3, 2, %l1\n" \
622 " add %l1, %l3, %l1\n" \
623 " sllx %l1, 10, %l2\n" \
624 " sub %l4, 4, %l4 ! No thanks to Sun for not obeying their own ABI\n" \
625 " sllx %l1, 5, %l1\n" \
626 " sub %l0, %l2, %l0\n" \
627 " udivx %l0, 24, %l0\n" \
628 " add %l0, %l4, %l0\n" \
629 " add %l1, %l0, %l1\n" \
630 " add %l1, %l1, %l0\n" \
631 " add %l0, %l1, %l0\n" \
632 " mov %i7, %o2\n" \
633 " call " #fixup_name "\n" \
634 " sllx %l0, 3, %o1\n" \
635 " jmp %o0\n" \
636 " restore\n" \
637 " .size " #tramp_name "_0, . - " #tramp_name "_0\n" \
638 "\n" \
639 " .globl " #tramp_name "_1\n" \
640 " .type " #tramp_name "_1, @function\n" \
641 " ! tramp_name_1 + 4 needs to be .align 32\n" \
642 "\t" #tramp_name "_1:\n" \
643 " sub %l6, 4, %l6\n" \
644 " ! srlx %g1, 12, %o1 - Done in .PLT1\n" \
645 " ldx [%l6 + 12], %o0\n" \
646 " add %o1, %o1, %o3\n" \
647 " sub %o1, 96, %o1 ! No thanks to Sun for not obeying their own ABI\n" \
648 " mov %i7, %o2\n" \
649 " call " #fixup_name "\n" \
650 " add %o1, %o3, %o1\n" \
651 " jmp %o0\n" \
652 " restore\n" \
653 " .size " #tramp_name "_1, . - " #tramp_name "_1\n" \
654 " .previous\n");
655
656 #ifndef PROF
657 #define ELF_MACHINE_RUNTIME_TRAMPOLINE \
658 TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup); \
659 TRAMPOLINE_TEMPLATE (_dl_runtime_profile, profile_fixup);
660 #else
661 #define ELF_MACHINE_RUNTIME_TRAMPOLINE \
662 TRAMPOLINE_TEMPLATE (_dl_runtime_resolve, fixup); \
663 TRAMPOLINE_TEMPLATE (_dl_runtime_profile, fixup);
664 #endif
665
666 /* The PLT uses Elf64_Rela relocs. */
667 #define elf_machine_relplt elf_machine_rela
668
669 /* Initial entry point code for the dynamic linker.
670 The C function `_dl_start' is the real entry point;
671 its return value is the user program's entry point. */
672
673 #define __S1(x) #x
674 #define __S(x) __S1(x)
675
676 #define RTLD_START __asm__ ( "\n" \
677 " .text\n" \
678 " .global _start\n" \
679 " .type _start, @function\n" \
680 " .align 32\n" \
681 "_start:\n" \
682 " /* Make room for functions to drop their arguments on the stack. */\n" \
683 " sub %sp, 6*8, %sp\n" \
684 " /* Pass pointer to argument block to _dl_start. */\n" \
685 " call _dl_start\n" \
686 " add %sp," __S(STACK_BIAS) "+22*8,%o0\n" \
687 " /* FALLTHRU */\n" \
688 " .size _start, .-_start\n" \
689 "\n" \
690 " .global _dl_start_user\n" \
691 " .type _dl_start_user, @function\n" \
692 "_dl_start_user:\n" \
693 " /* Load the GOT register. */\n" \
694 "1: call 11f\n" \
695 " sethi %hi(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7\n" \
696 "11: or %l7, %lo(_GLOBAL_OFFSET_TABLE_-(1b-.)), %l7\n" \
697 " /* Store the highest stack address. */\n" \
698 " sethi %hi(__libc_stack_end), %g5\n" \
699 " add %l7, %o7, %l7\n" \
700 " or %g5, %lo(__libc_stack_end), %g5\n" \
701 " /* Save the user entry point address in %l0. */\n" \
702 " mov %o0, %l0\n" \
703 " ldx [%l7 + %g5], %l1\n" \
704 " sethi %hi(_dl_skip_args), %g5\n" \
705 " add %sp, 6*8, %l2\n" \
706 " /* See if we were run as a command with the executable file name as an\n" \
707 " extra leading argument. If so, we must shift things around since we\n" \
708 " must keep the stack doubleword aligned. */\n" \
709 " or %g5, %lo(_dl_skip_args), %g5\n" \
710 " stx %l2, [%l1]\n" \
711 " ldx [%l7 + %g5], %i0\n" \
712 " ld [%i0], %i0\n" \
713 " brz,pt %i0, 2f\n" \
714 " ldx [%sp + " __S(STACK_BIAS) " + 22*8], %i5\n" \
715 " /* Find out how far to shift. */\n" \
716 " sethi %hi(_dl_argv), %l4\n" \
717 " sub %i5, %i0, %i5\n" \
718 " or %l4, %lo(_dl_argv), %l4\n" \
719 " sllx %i0, 3, %l6\n" \
720 " ldx [%l7 + %l4], %l4\n" \
721 " stx %i5, [%sp + " __S(STACK_BIAS) " + 22*8]\n" \
722 " add %sp, " __S(STACK_BIAS) " + 23*8, %i1\n" \
723 " add %i1, %l6, %i2\n" \
724 " ldx [%l4], %l5\n" \
725 " /* Copy down argv. */\n" \
726 "12: ldx [%i2], %i3\n" \
727 " add %i2, 8, %i2\n" \
728 " stx %i3, [%i1]\n" \
729 " brnz,pt %i3, 12b\n" \
730 " add %i1, 8, %i1\n" \
731 " sub %l5, %l6, %l5\n" \
732 " /* Copy down envp. */\n" \
733 "13: ldx [%i2], %i3\n" \
734 " add %i2, 8, %i2\n" \
735 " stx %i3, [%i1]\n" \
736 " brnz,pt %i3, 13b\n" \
737 " add %i1, 8, %i1\n" \
738 " /* Copy down auxiliary table. */\n" \
739 "14: ldx [%i2], %i3\n" \
740 " ldx [%i2 + 8], %i4\n" \
741 " add %i2, 16, %i2\n" \
742 " stx %i3, [%i1]\n" \
743 " stx %i4, [%i1 + 8]\n" \
744 " brnz,pt %i3, 14b\n" \
745 " add %i1, 16, %i1\n" \
746 " stx %l5, [%l4]\n" \
747 " /* %o0 = _dl_loaded, %o1 = argc, %o2 = argv, %o3 = envp. */\n" \
748 "2: sethi %hi(_rtld_local), %o0\n" \
749 " add %sp, " __S(STACK_BIAS) " + 23*8, %o2\n" \
750 " orcc %o0, %lo(_rtld_local), %o0\n" \
751 " sllx %i5, 3, %o3\n" \
752 " ldx [%l7 + %o0], %o0\n" \
753 " add %o3, 8, %o3\n" \
754 " mov %i5, %o1\n" \
755 " add %o2, %o3, %o3\n" \
756 " call _dl_init_internal\n" \
757 " ldx [%o0], %o0\n" \
758 " /* Pass our finalizer function to the user in %g1. */\n" \
759 " sethi %hi(_dl_fini), %g1\n" \
760 " or %g1, %lo(_dl_fini), %g1\n" \
761 " ldx [%l7 + %g1], %g1\n" \
762 " /* Jump to the user's entry point and deallocate the extra stack we got. */\n" \
763 " jmp %l0\n" \
764 " add %sp, 6*8, %sp\n" \
765 " .size _dl_start_user, . - _dl_start_user\n" \
766 " .previous\n");
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