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43dbf87f | 1 | /* PLT trampoline. MIPS version. |
688903eb | 2 | Copyright (C) 1996-2018 Free Software Foundation, Inc. |
43dbf87f AJ |
3 | This file is part of the GNU C Library. |
4 | Contributed by Kazumoto Kojima <kkojima@info.kanagawa-u.ac.jp>. | |
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 | |
ab84e3ff PE |
17 | License along with the GNU C Library. If not, see |
18 | <http://www.gnu.org/licenses/>. */ | |
43dbf87f AJ |
19 | |
20 | /* FIXME: Profiling of shared libraries is not implemented yet. */ | |
21 | ||
22 | #include <sysdep.h> | |
23 | #include <link.h> | |
24 | #include <elf.h> | |
25 | #include <ldsodefs.h> | |
26 | #include <dl-machine.h> | |
7865d19c | 27 | #include <sysdep-cancel.h> |
43dbf87f AJ |
28 | |
29 | /* Get link map for callers object containing STUB_PC. */ | |
30 | static inline struct link_map * | |
31 | elf_machine_runtime_link_map (ElfW(Addr) gpreg, ElfW(Addr) stub_pc) | |
32 | { | |
33 | extern int _dl_mips_gnu_objects; | |
34 | ||
35 | /* got[1] is reserved to keep its link map address for the shared | |
36 | object generated by the gnu linker. If all are such objects, we | |
37 | can find the link map from current GPREG simply. If not so, get | |
38 | the link map for caller's object containing STUB_PC. */ | |
39 | ||
40 | if (_dl_mips_gnu_objects) | |
41 | { | |
42 | ElfW(Addr) *got = elf_mips_got_from_gpreg (gpreg); | |
43 | ElfW(Word) g1; | |
44 | ||
45 | g1 = ((ElfW(Word) *) got)[1]; | |
46 | ||
47 | if ((g1 & ELF_MIPS_GNU_GOT1_MASK) != 0) | |
48 | { | |
49 | struct link_map *l = | |
50 | (struct link_map *) (g1 & ~ELF_MIPS_GNU_GOT1_MASK); | |
51 | ElfW(Addr) base, limit; | |
52 | const ElfW(Phdr) *p = l->l_phdr; | |
53 | ElfW(Half) this, nent = l->l_phnum; | |
54 | ||
55 | /* For the common case of a stub being called from the containing | |
56 | object, STUB_PC will point to somewhere within the object that | |
57 | is described by the link map fetched via got[1]. Otherwise we | |
58 | have to scan all maps. */ | |
59 | for (this = 0; this < nent; this++) | |
60 | { | |
61 | if (p[this].p_type == PT_LOAD) | |
62 | { | |
63 | base = p[this].p_vaddr + l->l_addr; | |
64 | limit = base + p[this].p_memsz; | |
65 | if (stub_pc >= base && stub_pc < limit) | |
66 | return l; | |
67 | } | |
68 | } | |
69 | } | |
70 | } | |
71 | ||
72 | struct link_map *l; | |
73 | Lmid_t nsid; | |
74 | ||
75 | for (nsid = 0; nsid < DL_NNS; ++nsid) | |
76 | for (l = GL(dl_ns)[nsid]._ns_loaded; l != NULL; l = l->l_next) | |
77 | { | |
78 | ElfW(Addr) base, limit; | |
79 | const ElfW(Phdr) *p = l->l_phdr; | |
80 | ElfW(Half) this, nent = l->l_phnum; | |
81 | ||
82 | for (this = 0; this < nent; ++this) | |
83 | { | |
84 | if (p[this].p_type == PT_LOAD) | |
85 | { | |
86 | base = p[this].p_vaddr + l->l_addr; | |
87 | limit = base + p[this].p_memsz; | |
88 | if (stub_pc >= base && stub_pc < limit) | |
89 | return l; | |
90 | } | |
91 | } | |
92 | } | |
93 | ||
94 | _dl_signal_error (0, NULL, NULL, "cannot find runtime link map"); | |
95 | return NULL; | |
96 | } | |
97 | ||
98 | /* Define mips specific runtime resolver. The function __dl_runtime_resolve | |
99 | is called from assembler function _dl_runtime_resolve which converts | |
100 | special argument registers t7 ($15) and t8 ($24): | |
101 | t7 address to return to the caller of the function | |
102 | t8 index for this function symbol in .dynsym | |
103 | to usual c arguments. | |
104 | ||
105 | Other architectures call fixup from dl-runtime.c in | |
106 | _dl_runtime_resolve. MIPS instead calls __dl_runtime_resolve. We | |
107 | have to use our own version because of the way the got section is | |
108 | treated on MIPS (we've also got ELF_MACHINE_PLT defined). */ | |
109 | ||
110 | /* The flag _dl_mips_gnu_objects is set if all dynamic objects are | |
111 | generated by the gnu linker. */ | |
112 | int _dl_mips_gnu_objects = 1; | |
113 | ||
43dbf87f AJ |
114 | /* This is called from assembly stubs below which the compiler can't see. */ |
115 | static ElfW(Addr) | |
116 | __dl_runtime_resolve (ElfW(Word), ElfW(Word), ElfW(Addr), ElfW(Addr)) | |
117 | __attribute_used__; | |
118 | ||
119 | static ElfW(Addr) | |
120 | __dl_runtime_resolve (ElfW(Word) sym_index, | |
121 | ElfW(Word) return_address, | |
122 | ElfW(Addr) old_gpreg, | |
123 | ElfW(Addr) stub_pc) | |
124 | { | |
125 | struct link_map *l = elf_machine_runtime_link_map (old_gpreg, stub_pc); | |
126 | const ElfW(Sym) *const symtab | |
127 | = (const ElfW(Sym) *) D_PTR (l, l_info[DT_SYMTAB]); | |
128 | const char *strtab = (const void *) D_PTR (l, l_info[DT_STRTAB]); | |
129 | ElfW(Addr) *got | |
130 | = (ElfW(Addr) *) D_PTR (l, l_info[DT_PLTGOT]); | |
131 | const ElfW(Word) local_gotno | |
132 | = (const ElfW(Word)) l->l_info[DT_MIPS (LOCAL_GOTNO)]->d_un.d_val; | |
133 | const ElfW(Word) gotsym | |
134 | = (const ElfW(Word)) l->l_info[DT_MIPS (GOTSYM)]->d_un.d_val; | |
135 | const ElfW(Sym) *sym = &symtab[sym_index]; | |
136 | struct link_map *sym_map; | |
137 | ElfW(Addr) value; | |
138 | ||
139 | /* FIXME: The symbol versioning stuff is not tested yet. */ | |
140 | if (__builtin_expect (ELFW(ST_VISIBILITY) (sym->st_other), 0) == 0) | |
141 | { | |
d0276e18 | 142 | switch (l->l_info[VERSYMIDX (DT_VERSYM)] != NULL ? 1 : 0) |
43dbf87f AJ |
143 | { |
144 | default: | |
145 | { | |
146 | const ElfW(Half) *vernum = | |
147 | (const void *) D_PTR (l, l_info[VERSYMIDX (DT_VERSYM)]); | |
148 | ElfW(Half) ndx = vernum[sym_index] & 0x7fff; | |
149 | const struct r_found_version *version = &l->l_versions[ndx]; | |
150 | ||
151 | if (version->hash != 0) | |
152 | { | |
7865d19c VV |
153 | /* We need to keep the scope around so do some locking. This is |
154 | not necessary for objects which cannot be unloaded or when | |
155 | we are not using any threads (yet). */ | |
156 | if (!RTLD_SINGLE_THREAD_P) | |
157 | THREAD_GSCOPE_SET_FLAG (); | |
158 | ||
7dda24b2 | 159 | sym_map = _dl_lookup_symbol_x (strtab + sym->st_name, l, |
43dbf87f AJ |
160 | &sym, l->l_scope, version, |
161 | ELF_RTYPE_CLASS_PLT, 0, 0); | |
7865d19c VV |
162 | |
163 | /* We are done with the global scope. */ | |
164 | if (!RTLD_SINGLE_THREAD_P) | |
165 | THREAD_GSCOPE_RESET_FLAG (); | |
166 | ||
43dbf87f AJ |
167 | break; |
168 | } | |
169 | /* Fall through. */ | |
170 | } | |
171 | case 0: | |
7865d19c VV |
172 | { |
173 | /* We need to keep the scope around so do some locking. This is | |
174 | not necessary for objects which cannot be unloaded or when | |
175 | we are not using any threads (yet). */ | |
176 | int flags = DL_LOOKUP_ADD_DEPENDENCY; | |
177 | if (!RTLD_SINGLE_THREAD_P) | |
178 | { | |
179 | THREAD_GSCOPE_SET_FLAG (); | |
180 | flags |= DL_LOOKUP_GSCOPE_LOCK; | |
181 | } | |
182 | ||
43dbf87f AJ |
183 | sym_map = _dl_lookup_symbol_x (strtab + sym->st_name, l, &sym, |
184 | l->l_scope, 0, ELF_RTYPE_CLASS_PLT, | |
7865d19c VV |
185 | flags, 0); |
186 | ||
187 | /* We are done with the global scope. */ | |
188 | if (!RTLD_SINGLE_THREAD_P) | |
189 | THREAD_GSCOPE_RESET_FLAG (); | |
190 | } | |
43dbf87f AJ |
191 | } |
192 | ||
193 | /* Currently value contains the base load address of the object | |
194 | that defines sym. Now add in the symbol offset. */ | |
10a446dd | 195 | value = SYMBOL_ADDRESS (sym_map, sym, true); |
43dbf87f AJ |
196 | } |
197 | else | |
198 | /* We already found the symbol. The module (and therefore its load | |
199 | address) is also known. */ | |
10a446dd | 200 | value = SYMBOL_ADDRESS (l, sym, true); |
43dbf87f AJ |
201 | |
202 | /* Apply the relocation with that value. */ | |
203 | *(got + local_gotno + sym_index - gotsym) = value; | |
204 | ||
205 | return value; | |
206 | } | |
207 | ||
208 | #if _MIPS_SIM == _ABIO32 | |
209 | #define ELF_DL_FRAME_SIZE 40 | |
210 | ||
211 | #define ELF_DL_SAVE_ARG_REGS "\ | |
212 | sw $15, 36($29)\n \ | |
213 | sw $4, 16($29)\n \ | |
214 | sw $5, 20($29)\n \ | |
215 | sw $6, 24($29)\n \ | |
216 | sw $7, 28($29)\n \ | |
217 | " | |
218 | ||
219 | #define ELF_DL_RESTORE_ARG_REGS "\ | |
220 | lw $31, 36($29)\n \ | |
221 | lw $4, 16($29)\n \ | |
222 | lw $5, 20($29)\n \ | |
223 | lw $6, 24($29)\n \ | |
224 | lw $7, 28($29)\n \ | |
225 | " | |
226 | ||
63fb881a DJ |
227 | /* The PLT resolver should also save and restore $2 and $3, which are used |
228 | as arguments to MIPS16 stub functions. */ | |
229 | #define ELF_DL_PLT_FRAME_SIZE 48 | |
230 | ||
231 | #define ELF_DL_PLT_SAVE_ARG_REGS \ | |
232 | ELF_DL_SAVE_ARG_REGS "\ | |
233 | sw $2, 40($29)\n \ | |
234 | sw $3, 44($29)\n \ | |
235 | " | |
236 | ||
237 | #define ELF_DL_PLT_RESTORE_ARG_REGS \ | |
238 | ELF_DL_RESTORE_ARG_REGS "\ | |
239 | lw $2, 40($29)\n \ | |
240 | lw $3, 44($29)\n \ | |
241 | " | |
242 | ||
43dbf87f | 243 | #define IFABIO32(X) X |
63fb881a | 244 | #define IFNEWABI(X) |
43dbf87f AJ |
245 | |
246 | #else /* _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64 */ | |
247 | ||
248 | #define ELF_DL_FRAME_SIZE 80 | |
249 | ||
250 | #define ELF_DL_SAVE_ARG_REGS "\ | |
251 | sd $15, 72($29)\n \ | |
252 | sd $4, 8($29)\n \ | |
253 | sd $5, 16($29)\n \ | |
254 | sd $6, 24($29)\n \ | |
255 | sd $7, 32($29)\n \ | |
256 | sd $8, 40($29)\n \ | |
257 | sd $9, 48($29)\n \ | |
258 | sd $10, 56($29)\n \ | |
259 | sd $11, 64($29)\n \ | |
260 | " | |
261 | ||
262 | #define ELF_DL_RESTORE_ARG_REGS "\ | |
263 | ld $31, 72($29)\n \ | |
264 | ld $4, 8($29)\n \ | |
265 | ld $5, 16($29)\n \ | |
266 | ld $6, 24($29)\n \ | |
267 | ld $7, 32($29)\n \ | |
268 | ld $8, 40($29)\n \ | |
269 | ld $9, 48($29)\n \ | |
270 | ld $10, 56($29)\n \ | |
271 | ld $11, 64($29)\n \ | |
272 | " | |
273 | ||
63fb881a DJ |
274 | /* The PLT resolver should also save and restore $2 and $3, which are used |
275 | as arguments to MIPS16 stub functions. */ | |
276 | #define ELF_DL_PLT_FRAME_SIZE 96 | |
277 | ||
278 | #define ELF_DL_PLT_SAVE_ARG_REGS \ | |
279 | ELF_DL_SAVE_ARG_REGS "\ | |
280 | sd $2, 80($29)\n \ | |
281 | sd $3, 88($29)\n \ | |
282 | " | |
283 | ||
284 | #define ELF_DL_PLT_RESTORE_ARG_REGS \ | |
285 | ELF_DL_RESTORE_ARG_REGS "\ | |
286 | ld $2, 80($29)\n \ | |
287 | ld $3, 88($29)\n \ | |
288 | " | |
289 | ||
43dbf87f | 290 | #define IFABIO32(X) |
63fb881a | 291 | #define IFNEWABI(X) X |
43dbf87f AJ |
292 | |
293 | #endif | |
294 | ||
43301bd3 | 295 | #ifndef __mips16 |
43dbf87f AJ |
296 | asm ("\n\ |
297 | .text\n\ | |
298 | .align 2\n\ | |
43301bd3 | 299 | .set nomips16\n\ |
43dbf87f AJ |
300 | .globl _dl_runtime_resolve\n\ |
301 | .type _dl_runtime_resolve,@function\n\ | |
302 | .ent _dl_runtime_resolve\n\ | |
303 | _dl_runtime_resolve:\n\ | |
304 | .frame $29, " STRINGXP(ELF_DL_FRAME_SIZE) ", $31\n\ | |
305 | .set noreorder\n\ | |
306 | # Save GP.\n\ | |
54b7103a | 307 | 1: move $3, $28\n\ |
43dbf87f AJ |
308 | # Save arguments and sp value in stack.\n\ |
309 | " STRINGXP(PTR_SUBIU) " $29, " STRINGXP(ELF_DL_FRAME_SIZE) "\n\ | |
310 | # Modify t9 ($25) so as to point .cpload instruction.\n\ | |
54b7103a | 311 | " IFABIO32(STRINGXP(PTR_ADDIU) " $25, (2f-1b)\n") "\ |
43dbf87f | 312 | # Compute GP.\n\ |
54b7103a | 313 | 2: " STRINGXP(SETUP_GP) "\n\ |
43dbf87f AJ |
314 | " STRINGXV(SETUP_GP64 (0, _dl_runtime_resolve)) "\n\ |
315 | .set reorder\n\ | |
316 | # Save slot call pc.\n\ | |
317 | move $2, $31\n\ | |
318 | " IFABIO32(STRINGXP(CPRESTORE(32))) "\n\ | |
319 | " ELF_DL_SAVE_ARG_REGS "\ | |
320 | move $4, $24\n\ | |
321 | move $5, $15\n\ | |
322 | move $6, $3\n\ | |
323 | move $7, $2\n\ | |
324 | jal __dl_runtime_resolve\n\ | |
325 | " ELF_DL_RESTORE_ARG_REGS "\ | |
326 | " STRINGXP(RESTORE_GP64) "\n\ | |
327 | " STRINGXP(PTR_ADDIU) " $29, " STRINGXP(ELF_DL_FRAME_SIZE) "\n\ | |
328 | move $25, $2\n\ | |
329 | jr $25\n\ | |
330 | .end _dl_runtime_resolve\n\ | |
331 | .previous\n\ | |
332 | "); | |
63fb881a DJ |
333 | |
334 | /* Assembler veneer called from the PLT header code when using PLTs. | |
335 | ||
336 | Code in each PLT entry and the PLT header fills in the arguments to | |
337 | this function: | |
338 | ||
339 | - $15 (o32 t7, n32/n64 t3) - caller's return address | |
340 | - $24 (t8) - PLT entry index | |
341 | - $25 (t9) - address of _dl_runtime_pltresolve | |
342 | - o32 $28 (gp), n32/n64 $14 (t2) - address of .got.plt | |
343 | ||
344 | Different registers are used for .got.plt because the ABI was | |
345 | originally designed for o32, where gp was available (call | |
346 | clobbered). On n32/n64 gp is call saved. | |
347 | ||
348 | _dl_fixup needs: | |
349 | ||
350 | - $4 (a0) - link map address | |
351 | - $5 (a1) - .rel.plt offset (== PLT entry index * 8) */ | |
352 | ||
353 | asm ("\n\ | |
354 | .text\n\ | |
355 | .align 2\n\ | |
43301bd3 | 356 | .set nomips16\n\ |
63fb881a DJ |
357 | .globl _dl_runtime_pltresolve\n\ |
358 | .type _dl_runtime_pltresolve,@function\n\ | |
359 | .ent _dl_runtime_pltresolve\n\ | |
360 | _dl_runtime_pltresolve:\n\ | |
361 | .frame $29, " STRINGXP(ELF_DL_PLT_FRAME_SIZE) ", $31\n\ | |
362 | .set noreorder\n\ | |
363 | # Save arguments and sp value in stack.\n\ | |
54b7103a | 364 | 1: " STRINGXP(PTR_SUBIU) " $29, " STRINGXP(ELF_DL_PLT_FRAME_SIZE) "\n\ |
63fb881a DJ |
365 | " IFABIO32(STRINGXP(PTR_L) " $13, " STRINGXP(PTRSIZE) "($28)") "\n\ |
366 | " IFNEWABI(STRINGXP(PTR_L) " $13, " STRINGXP(PTRSIZE) "($14)") "\n\ | |
367 | # Modify t9 ($25) so as to point .cpload instruction.\n\ | |
54b7103a | 368 | " IFABIO32(STRINGXP(PTR_ADDIU) " $25, (2f-1b)\n") "\ |
63fb881a | 369 | # Compute GP.\n\ |
54b7103a | 370 | 2: " STRINGXP(SETUP_GP) "\n\ |
63fb881a DJ |
371 | " STRINGXV(SETUP_GP64 (0, _dl_runtime_pltresolve)) "\n\ |
372 | .set reorder\n\ | |
373 | " IFABIO32(STRINGXP(CPRESTORE(32))) "\n\ | |
374 | " ELF_DL_PLT_SAVE_ARG_REGS "\ | |
375 | move $4, $13\n\ | |
376 | sll $5, $24, " STRINGXP(PTRLOG) " + 1\n\ | |
377 | jal _dl_fixup\n\ | |
378 | move $25, $2\n\ | |
379 | " ELF_DL_PLT_RESTORE_ARG_REGS "\ | |
380 | " STRINGXP(RESTORE_GP64) "\n\ | |
381 | " STRINGXP(PTR_ADDIU) " $29, " STRINGXP(ELF_DL_PLT_FRAME_SIZE) "\n\ | |
382 | jr $25\n\ | |
383 | .end _dl_runtime_pltresolve\n\ | |
384 | .previous\n\ | |
385 | "); | |
386 | ||
43301bd3 MR |
387 | #elif _MIPS_SIM == _ABIO32 /* __mips16 */ |
388 | /* MIPS16 version, O32 only. */ | |
389 | asm ("\n\ | |
390 | .text\n\ | |
391 | .align 2\n\ | |
392 | .set mips16\n\ | |
393 | .globl _dl_runtime_resolve\n\ | |
394 | .type _dl_runtime_resolve,@function\n\ | |
395 | .ent _dl_runtime_resolve\n\ | |
396 | _dl_runtime_resolve:\n\ | |
397 | .frame $29, " STRINGXP (ELF_DL_FRAME_SIZE) ", $31\n\ | |
398 | # Save arguments and sp value in stack.\n\t" | |
399 | # if _MIPS_ISA >= _MIPS_ISA_MIPS32 | |
400 | "save " STRINGXP (ELF_DL_FRAME_SIZE) ", $4-$7, $ra\n\t" | |
401 | # else | |
402 | "addiu $sp, -" STRINGXP (ELF_DL_FRAME_SIZE) "\n\ | |
403 | sw $7, 32($sp)\n\ | |
404 | sw $6, 28($sp)\n\ | |
405 | sw $5, 24($sp)\n\ | |
406 | sw $4, 20($sp)\n\t" | |
407 | # endif | |
408 | "# Preserve caller's $ra, for RESTORE instruction below.\n\ | |
409 | move $5, $15\n\ | |
410 | sw $5, 36($sp)\n\ | |
411 | # Compute GP into $2.\n\ | |
412 | li $2, %hi(_gp_disp)\n\ | |
413 | addiu $3, $pc, %lo(_gp_disp)\n\ | |
414 | sll $2, 16\n\ | |
415 | addu $2, $3\n\ | |
416 | lw $3, %got(__dl_runtime_resolve)($2)\n\ | |
417 | move $4, $24\n\ | |
418 | addiu $3, %lo(__dl_runtime_resolve)\n\ | |
419 | move $7, $ra\n\ | |
420 | move $6, $28\n\ | |
421 | move $25, $3\n\ | |
422 | jalr $3\n\t" | |
423 | # if _MIPS_ISA >= _MIPS_ISA_MIPS32 | |
424 | "restore " STRINGXP(ELF_DL_FRAME_SIZE) ", $4-$7, $ra\n\t" | |
425 | # else | |
426 | "# Restore $ra, move placed further down to hide latency.\n\ | |
427 | lw $4, 36($sp)\n\ | |
428 | lw $5, 24($sp)\n\ | |
429 | lw $6, 28($sp)\n\ | |
430 | lw $7, 32($sp)\n\ | |
431 | move $ra, $4\n\ | |
432 | lw $4, 20($sp)\n\ | |
433 | addiu $sp, " STRINGXP(ELF_DL_FRAME_SIZE) "\n\t" | |
434 | # endif | |
435 | "move $25, $2\n\ | |
436 | jr $2\n\ | |
437 | .end _dl_runtime_resolve\n\ | |
438 | .previous\n\ | |
439 | "); | |
440 | ||
441 | asm ("\n\ | |
442 | .text\n\ | |
443 | .align 2\n\ | |
444 | .set mips16\n\ | |
445 | .globl _dl_runtime_pltresolve\n\ | |
446 | .type _dl_runtime_pltresolve,@function\n\ | |
447 | .ent _dl_runtime_pltresolve\n\ | |
448 | _dl_runtime_pltresolve:\n\ | |
449 | .frame $29, " STRINGXP(ELF_DL_PLT_FRAME_SIZE) ", $31\n\ | |
450 | # Save arguments and sp value in stack.\n\t" | |
451 | # if _MIPS_ISA >= _MIPS_ISA_MIPS32 | |
452 | "save " STRINGXP(ELF_DL_PLT_FRAME_SIZE) ", $4-$7, $ra\n\t" | |
453 | # else | |
454 | "addiu $sp, -" STRINGXP(ELF_DL_PLT_FRAME_SIZE) "\n\ | |
455 | sw $7, 40($sp)\n\ | |
456 | sw $6, 36($sp)\n\ | |
457 | sw $5, 32($sp)\n\ | |
458 | sw $4, 28($sp)\n\t" | |
459 | # endif | |
460 | "# Preserve MIPS16 stub function arguments.\n\ | |
461 | sw $3, 20($sp)\n\ | |
462 | sw $2, 16($sp)\n\ | |
463 | # Preserve caller's $ra, for RESTORE instruction below.\n\ | |
464 | move $3, $15\n\ | |
465 | sw $3, 44($sp)\n\ | |
466 | # Compute GP into $2.\n\ | |
467 | li $2, %hi(_gp_disp)\n\ | |
468 | addiu $3, $pc, %lo(_gp_disp)\n\ | |
469 | sll $2, 16\n\ | |
470 | addu $2, $3\n\ | |
471 | # Save GP value in slot.\n\ | |
472 | sw $2, 24($sp)\n\ | |
473 | # Load _dl_fixup address.\n\ | |
474 | lw $6, %call16(_dl_fixup)($2)\n\ | |
475 | # Load link map address.\n\ | |
476 | move $3, $28\n\ | |
477 | lw $4, " STRINGXP (PTRSIZE) "($3)\n\ | |
478 | move $5, $24\n\ | |
479 | sll $5, " STRINGXP (PTRLOG) " + 1\n\ | |
480 | # Call _dl_fixup.\n\ | |
481 | move $25, $6\n\ | |
482 | jalr $6\n\ | |
483 | move $25, $2\n\ | |
484 | # Reload GP value into $28.\n\ | |
485 | lw $3, 24($sp)\n\ | |
486 | move $28, $3\n\ | |
487 | lw $3, 16($sp)\n\ | |
488 | move $15, $3\n\ | |
489 | lw $3, 20($sp)\n\t" | |
490 | # if _MIPS_ISA >= _MIPS_ISA_MIPS32 | |
491 | "restore " STRINGXP (ELF_DL_PLT_FRAME_SIZE) ", $4-$7, $ra\n\t" | |
492 | # else | |
493 | "# Restore $ra, move placed further down to hide latency.\n\ | |
494 | lw $4, 44($sp)\n\ | |
495 | lw $5, 32($sp)\n\ | |
496 | lw $6, 36($sp)\n\ | |
497 | lw $7, 40($sp)\n\ | |
498 | move $ra, $4\n\ | |
499 | lw $4, 28($sp)\n\ | |
500 | addiu $sp, " STRINGXP (ELF_DL_PLT_FRAME_SIZE) "\n\t" | |
501 | # endif | |
502 | ".set noreorder\n\ | |
503 | jr $2\n\ | |
504 | move $2, $15\n\ | |
505 | .set reorder\n\ | |
506 | .end _dl_runtime_pltresolve\n\ | |
507 | .previous\n\ | |
508 | "); | |
509 | ||
510 | #else /* __mips16 && _MIPS_SIM != _ABIO32 */ | |
511 | # error "MIPS16 support for N32/N64 not implemented" | |
512 | ||
513 | #endif /* __mips16 */ |