1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Author: Hanlu Li <lihanlu@loongson.cn>
4 * Huacai Chen <chenhuacai@loongson.cn>
5 *
6 * Copyright (C) 2020-2022 Loongson Technology Corporation Limited
7 */
8
9 #define pr_fmt(fmt) "kmod: " fmt
10
11 #include <linux/moduleloader.h>
12 #include <linux/elf.h>
13 #include <linux/mm.h>
14 #include <linux/numa.h>
15 #include <linux/vmalloc.h>
16 #include <linux/slab.h>
17 #include <linux/fs.h>
18 #include <linux/ftrace.h>
19 #include <linux/string.h>
20 #include <linux/kernel.h>
21 #include <asm/alternative.h>
22 #include <asm/inst.h>
23 #include <asm/unwind.h>
24
rela_stack_push(s64 stack_value,s64 * rela_stack,size_t * rela_stack_top)25 static int rela_stack_push(s64 stack_value, s64 *rela_stack, size_t *rela_stack_top)
26 {
27 if (*rela_stack_top >= RELA_STACK_DEPTH)
28 return -ENOEXEC;
29
30 rela_stack[(*rela_stack_top)++] = stack_value;
31 pr_debug("%s stack_value = 0x%llx\n", __func__, stack_value);
32
33 return 0;
34 }
35
rela_stack_pop(s64 * stack_value,s64 * rela_stack,size_t * rela_stack_top)36 static int rela_stack_pop(s64 *stack_value, s64 *rela_stack, size_t *rela_stack_top)
37 {
38 if (*rela_stack_top == 0)
39 return -ENOEXEC;
40
41 *stack_value = rela_stack[--(*rela_stack_top)];
42 pr_debug("%s stack_value = 0x%llx\n", __func__, *stack_value);
43
44 return 0;
45 }
46
apply_r_larch_none(struct module * mod,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)47 static int apply_r_larch_none(struct module *mod, u32 *location, Elf_Addr v,
48 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
49 {
50 return 0;
51 }
52
apply_r_larch_error(struct module * me,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)53 static int apply_r_larch_error(struct module *me, u32 *location, Elf_Addr v,
54 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
55 {
56 pr_err("%s: Unsupport relocation type %u, please add its support.\n", me->name, type);
57 return -EINVAL;
58 }
59
apply_r_larch_32(struct module * mod,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)60 static int apply_r_larch_32(struct module *mod, u32 *location, Elf_Addr v,
61 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
62 {
63 *location = v;
64 return 0;
65 }
66
apply_r_larch_64(struct module * mod,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)67 static int apply_r_larch_64(struct module *mod, u32 *location, Elf_Addr v,
68 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
69 {
70 *(Elf_Addr *)location = v;
71 return 0;
72 }
73
apply_r_larch_sop_push_pcrel(struct module * mod,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)74 static int apply_r_larch_sop_push_pcrel(struct module *mod, u32 *location, Elf_Addr v,
75 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
76 {
77 return rela_stack_push(v - (u64)location, rela_stack, rela_stack_top);
78 }
79
apply_r_larch_sop_push_absolute(struct module * mod,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)80 static int apply_r_larch_sop_push_absolute(struct module *mod, u32 *location, Elf_Addr v,
81 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
82 {
83 return rela_stack_push(v, rela_stack, rela_stack_top);
84 }
85
apply_r_larch_sop_push_dup(struct module * mod,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)86 static int apply_r_larch_sop_push_dup(struct module *mod, u32 *location, Elf_Addr v,
87 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
88 {
89 int err = 0;
90 s64 opr1;
91
92 err = rela_stack_pop(&opr1, rela_stack, rela_stack_top);
93 if (err)
94 return err;
95 err = rela_stack_push(opr1, rela_stack, rela_stack_top);
96 if (err)
97 return err;
98 err = rela_stack_push(opr1, rela_stack, rela_stack_top);
99 if (err)
100 return err;
101
102 return 0;
103 }
104
apply_r_larch_sop_push_plt_pcrel(struct module * mod,Elf_Shdr * sechdrs,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)105 static int apply_r_larch_sop_push_plt_pcrel(struct module *mod,
106 Elf_Shdr *sechdrs, u32 *location, Elf_Addr v,
107 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
108 {
109 ptrdiff_t offset = (void *)v - (void *)location;
110
111 if (offset >= SZ_128M)
112 v = module_emit_plt_entry(mod, sechdrs, v);
113
114 if (offset < -SZ_128M)
115 v = module_emit_plt_entry(mod, sechdrs, v);
116
117 return apply_r_larch_sop_push_pcrel(mod, location, v, rela_stack, rela_stack_top, type);
118 }
119
apply_r_larch_sop(struct module * mod,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)120 static int apply_r_larch_sop(struct module *mod, u32 *location, Elf_Addr v,
121 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
122 {
123 int err = 0;
124 s64 opr1, opr2, opr3;
125
126 if (type == R_LARCH_SOP_IF_ELSE) {
127 err = rela_stack_pop(&opr3, rela_stack, rela_stack_top);
128 if (err)
129 return err;
130 }
131
132 err = rela_stack_pop(&opr2, rela_stack, rela_stack_top);
133 if (err)
134 return err;
135 err = rela_stack_pop(&opr1, rela_stack, rela_stack_top);
136 if (err)
137 return err;
138
139 switch (type) {
140 case R_LARCH_SOP_AND:
141 err = rela_stack_push(opr1 & opr2, rela_stack, rela_stack_top);
142 break;
143 case R_LARCH_SOP_ADD:
144 err = rela_stack_push(opr1 + opr2, rela_stack, rela_stack_top);
145 break;
146 case R_LARCH_SOP_SUB:
147 err = rela_stack_push(opr1 - opr2, rela_stack, rela_stack_top);
148 break;
149 case R_LARCH_SOP_SL:
150 err = rela_stack_push(opr1 << opr2, rela_stack, rela_stack_top);
151 break;
152 case R_LARCH_SOP_SR:
153 err = rela_stack_push(opr1 >> opr2, rela_stack, rela_stack_top);
154 break;
155 case R_LARCH_SOP_IF_ELSE:
156 err = rela_stack_push(opr1 ? opr2 : opr3, rela_stack, rela_stack_top);
157 break;
158 default:
159 pr_err("%s: Unsupport relocation type %u\n", mod->name, type);
160 return -EINVAL;
161 }
162
163 return err;
164 }
165
apply_r_larch_sop_imm_field(struct module * mod,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)166 static int apply_r_larch_sop_imm_field(struct module *mod, u32 *location, Elf_Addr v,
167 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
168 {
169 int err = 0;
170 s64 opr1;
171 union loongarch_instruction *insn = (union loongarch_instruction *)location;
172
173 err = rela_stack_pop(&opr1, rela_stack, rela_stack_top);
174 if (err)
175 return err;
176
177 switch (type) {
178 case R_LARCH_SOP_POP_32_U_10_12:
179 if (!unsigned_imm_check(opr1, 12))
180 goto overflow;
181
182 /* (*(uint32_t *) PC) [21 ... 10] = opr [11 ... 0] */
183 insn->reg2i12_format.immediate = opr1 & 0xfff;
184 return 0;
185 case R_LARCH_SOP_POP_32_S_10_12:
186 if (!signed_imm_check(opr1, 12))
187 goto overflow;
188
189 insn->reg2i12_format.immediate = opr1 & 0xfff;
190 return 0;
191 case R_LARCH_SOP_POP_32_S_10_16:
192 if (!signed_imm_check(opr1, 16))
193 goto overflow;
194
195 insn->reg2i16_format.immediate = opr1 & 0xffff;
196 return 0;
197 case R_LARCH_SOP_POP_32_S_10_16_S2:
198 if (opr1 % 4)
199 goto unaligned;
200
201 if (!signed_imm_check(opr1, 18))
202 goto overflow;
203
204 insn->reg2i16_format.immediate = (opr1 >> 2) & 0xffff;
205 return 0;
206 case R_LARCH_SOP_POP_32_S_5_20:
207 if (!signed_imm_check(opr1, 20))
208 goto overflow;
209
210 insn->reg1i20_format.immediate = (opr1) & 0xfffff;
211 return 0;
212 case R_LARCH_SOP_POP_32_S_0_5_10_16_S2:
213 if (opr1 % 4)
214 goto unaligned;
215
216 if (!signed_imm_check(opr1, 23))
217 goto overflow;
218
219 opr1 >>= 2;
220 insn->reg1i21_format.immediate_l = opr1 & 0xffff;
221 insn->reg1i21_format.immediate_h = (opr1 >> 16) & 0x1f;
222 return 0;
223 case R_LARCH_SOP_POP_32_S_0_10_10_16_S2:
224 if (opr1 % 4)
225 goto unaligned;
226
227 if (!signed_imm_check(opr1, 28))
228 goto overflow;
229
230 opr1 >>= 2;
231 insn->reg0i26_format.immediate_l = opr1 & 0xffff;
232 insn->reg0i26_format.immediate_h = (opr1 >> 16) & 0x3ff;
233 return 0;
234 case R_LARCH_SOP_POP_32_U:
235 if (!unsigned_imm_check(opr1, 32))
236 goto overflow;
237
238 /* (*(uint32_t *) PC) = opr */
239 *location = (u32)opr1;
240 return 0;
241 default:
242 pr_err("%s: Unsupport relocation type %u\n", mod->name, type);
243 return -EINVAL;
244 }
245
246 overflow:
247 pr_err("module %s: opr1 = 0x%llx overflow! dangerous %s (%u) relocation\n",
248 mod->name, opr1, __func__, type);
249 return -ENOEXEC;
250
251 unaligned:
252 pr_err("module %s: opr1 = 0x%llx unaligned! dangerous %s (%u) relocation\n",
253 mod->name, opr1, __func__, type);
254 return -ENOEXEC;
255 }
256
apply_r_larch_add_sub(struct module * mod,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)257 static int apply_r_larch_add_sub(struct module *mod, u32 *location, Elf_Addr v,
258 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
259 {
260 switch (type) {
261 case R_LARCH_ADD32:
262 *(s32 *)location += v;
263 return 0;
264 case R_LARCH_ADD64:
265 *(s64 *)location += v;
266 return 0;
267 case R_LARCH_SUB32:
268 *(s32 *)location -= v;
269 return 0;
270 case R_LARCH_SUB64:
271 *(s64 *)location -= v;
272 return 0;
273 default:
274 pr_err("%s: Unsupport relocation type %u\n", mod->name, type);
275 return -EINVAL;
276 }
277 }
278
apply_r_larch_b26(struct module * mod,Elf_Shdr * sechdrs,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)279 static int apply_r_larch_b26(struct module *mod,
280 Elf_Shdr *sechdrs, u32 *location, Elf_Addr v,
281 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
282 {
283 ptrdiff_t offset = (void *)v - (void *)location;
284 union loongarch_instruction *insn = (union loongarch_instruction *)location;
285
286 if (offset >= SZ_128M)
287 v = module_emit_plt_entry(mod, sechdrs, v);
288
289 if (offset < -SZ_128M)
290 v = module_emit_plt_entry(mod, sechdrs, v);
291
292 offset = (void *)v - (void *)location;
293
294 if (offset & 3) {
295 pr_err("module %s: jump offset = 0x%llx unaligned! dangerous R_LARCH_B26 (%u) relocation\n",
296 mod->name, (long long)offset, type);
297 return -ENOEXEC;
298 }
299
300 if (!signed_imm_check(offset, 28)) {
301 pr_err("module %s: jump offset = 0x%llx overflow! dangerous R_LARCH_B26 (%u) relocation\n",
302 mod->name, (long long)offset, type);
303 return -ENOEXEC;
304 }
305
306 offset >>= 2;
307 insn->reg0i26_format.immediate_l = offset & 0xffff;
308 insn->reg0i26_format.immediate_h = (offset >> 16) & 0x3ff;
309
310 return 0;
311 }
312
apply_r_larch_pcala(struct module * mod,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)313 static int apply_r_larch_pcala(struct module *mod, u32 *location, Elf_Addr v,
314 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
315 {
316 union loongarch_instruction *insn = (union loongarch_instruction *)location;
317 /* Use s32 for a sign-extension deliberately. */
318 s32 offset_hi20 = (void *)((v + 0x800) & ~0xfff) -
319 (void *)((Elf_Addr)location & ~0xfff);
320 Elf_Addr anchor = (((Elf_Addr)location) & ~0xfff) + offset_hi20;
321 ptrdiff_t offset_rem = (void *)v - (void *)anchor;
322
323 switch (type) {
324 case R_LARCH_PCALA_LO12:
325 insn->reg2i12_format.immediate = v & 0xfff;
326 break;
327 case R_LARCH_PCALA_HI20:
328 v = offset_hi20 >> 12;
329 insn->reg1i20_format.immediate = v & 0xfffff;
330 break;
331 case R_LARCH_PCALA64_LO20:
332 v = offset_rem >> 32;
333 insn->reg1i20_format.immediate = v & 0xfffff;
334 break;
335 case R_LARCH_PCALA64_HI12:
336 v = offset_rem >> 52;
337 insn->reg2i12_format.immediate = v & 0xfff;
338 break;
339 default:
340 pr_err("%s: Unsupport relocation type %u\n", mod->name, type);
341 return -EINVAL;
342 }
343
344 return 0;
345 }
346
apply_r_larch_got_pc(struct module * mod,Elf_Shdr * sechdrs,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)347 static int apply_r_larch_got_pc(struct module *mod,
348 Elf_Shdr *sechdrs, u32 *location, Elf_Addr v,
349 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
350 {
351 Elf_Addr got = module_emit_got_entry(mod, sechdrs, v);
352
353 if (!got)
354 return -EINVAL;
355
356 switch (type) {
357 case R_LARCH_GOT_PC_LO12:
358 type = R_LARCH_PCALA_LO12;
359 break;
360 case R_LARCH_GOT_PC_HI20:
361 type = R_LARCH_PCALA_HI20;
362 break;
363 default:
364 pr_err("%s: Unsupport relocation type %u\n", mod->name, type);
365 return -EINVAL;
366 }
367
368 return apply_r_larch_pcala(mod, location, got, rela_stack, rela_stack_top, type);
369 }
370
apply_r_larch_32_pcrel(struct module * mod,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)371 static int apply_r_larch_32_pcrel(struct module *mod, u32 *location, Elf_Addr v,
372 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
373 {
374 ptrdiff_t offset = (void *)v - (void *)location;
375
376 *(u32 *)location = offset;
377 return 0;
378 }
379
apply_r_larch_64_pcrel(struct module * mod,u32 * location,Elf_Addr v,s64 * rela_stack,size_t * rela_stack_top,unsigned int type)380 static int apply_r_larch_64_pcrel(struct module *mod, u32 *location, Elf_Addr v,
381 s64 *rela_stack, size_t *rela_stack_top, unsigned int type)
382 {
383 ptrdiff_t offset = (void *)v - (void *)location;
384
385 *(u64 *)location = offset;
386 return 0;
387 }
388
389 /*
390 * reloc_handlers_rela() - Apply a particular relocation to a module
391 * @mod: the module to apply the reloc to
392 * @location: the address at which the reloc is to be applied
393 * @v: the value of the reloc, with addend for RELA-style
394 * @rela_stack: the stack used for store relocation info, LOCAL to THIS module
395 * @rela_stac_top: where the stack operation(pop/push) applies to
396 *
397 * Return: 0 upon success, else -ERRNO
398 */
399 typedef int (*reloc_rela_handler)(struct module *mod, u32 *location, Elf_Addr v,
400 s64 *rela_stack, size_t *rela_stack_top, unsigned int type);
401
402 /* The handlers for known reloc types */
403 static reloc_rela_handler reloc_rela_handlers[] = {
404 [R_LARCH_NONE ... R_LARCH_64_PCREL] = apply_r_larch_error,
405
406 [R_LARCH_NONE] = apply_r_larch_none,
407 [R_LARCH_32] = apply_r_larch_32,
408 [R_LARCH_64] = apply_r_larch_64,
409 [R_LARCH_MARK_LA] = apply_r_larch_none,
410 [R_LARCH_MARK_PCREL] = apply_r_larch_none,
411 [R_LARCH_SOP_PUSH_PCREL] = apply_r_larch_sop_push_pcrel,
412 [R_LARCH_SOP_PUSH_ABSOLUTE] = apply_r_larch_sop_push_absolute,
413 [R_LARCH_SOP_PUSH_DUP] = apply_r_larch_sop_push_dup,
414 [R_LARCH_SOP_SUB ... R_LARCH_SOP_IF_ELSE] = apply_r_larch_sop,
415 [R_LARCH_SOP_POP_32_S_10_5 ... R_LARCH_SOP_POP_32_U] = apply_r_larch_sop_imm_field,
416 [R_LARCH_ADD32 ... R_LARCH_SUB64] = apply_r_larch_add_sub,
417 [R_LARCH_PCALA_HI20...R_LARCH_PCALA64_HI12] = apply_r_larch_pcala,
418 [R_LARCH_32_PCREL] = apply_r_larch_32_pcrel,
419 [R_LARCH_64_PCREL] = apply_r_larch_64_pcrel,
420 };
421
apply_relocate_add(Elf_Shdr * sechdrs,const char * strtab,unsigned int symindex,unsigned int relsec,struct module * mod)422 int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
423 unsigned int symindex, unsigned int relsec,
424 struct module *mod)
425 {
426 int i, err;
427 unsigned int type;
428 s64 rela_stack[RELA_STACK_DEPTH];
429 size_t rela_stack_top = 0;
430 reloc_rela_handler handler;
431 void *location;
432 Elf_Addr v;
433 Elf_Sym *sym;
434 Elf_Rela *rel = (void *) sechdrs[relsec].sh_addr;
435
436 pr_debug("%s: Applying relocate section %u to %u\n", __func__, relsec,
437 sechdrs[relsec].sh_info);
438
439 rela_stack_top = 0;
440 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
441 /* This is where to make the change */
442 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + rel[i].r_offset;
443 /* This is the symbol it is referring to */
444 sym = (Elf_Sym *)sechdrs[symindex].sh_addr + ELF_R_SYM(rel[i].r_info);
445 if (IS_ERR_VALUE(sym->st_value)) {
446 /* Ignore unresolved weak symbol */
447 if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
448 continue;
449 pr_warn("%s: Unknown symbol %s\n", mod->name, strtab + sym->st_name);
450 return -ENOENT;
451 }
452
453 type = ELF_R_TYPE(rel[i].r_info);
454
455 if (type < ARRAY_SIZE(reloc_rela_handlers))
456 handler = reloc_rela_handlers[type];
457 else
458 handler = NULL;
459
460 if (!handler) {
461 pr_err("%s: Unknown relocation type %u\n", mod->name, type);
462 return -EINVAL;
463 }
464
465 pr_debug("type %d st_value %llx r_addend %llx loc %llx\n",
466 (int)ELF_R_TYPE(rel[i].r_info),
467 sym->st_value, rel[i].r_addend, (u64)location);
468
469 v = sym->st_value + rel[i].r_addend;
470 switch (type) {
471 case R_LARCH_B26:
472 err = apply_r_larch_b26(mod, sechdrs, location,
473 v, rela_stack, &rela_stack_top, type);
474 break;
475 case R_LARCH_GOT_PC_HI20...R_LARCH_GOT_PC_LO12:
476 err = apply_r_larch_got_pc(mod, sechdrs, location,
477 v, rela_stack, &rela_stack_top, type);
478 break;
479 case R_LARCH_SOP_PUSH_PLT_PCREL:
480 err = apply_r_larch_sop_push_plt_pcrel(mod, sechdrs, location,
481 v, rela_stack, &rela_stack_top, type);
482 break;
483 default:
484 err = handler(mod, location, v, rela_stack, &rela_stack_top, type);
485 }
486 if (err)
487 return err;
488 }
489
490 return 0;
491 }
492
module_init_ftrace_plt(const Elf_Ehdr * hdr,const Elf_Shdr * sechdrs,struct module * mod)493 static void module_init_ftrace_plt(const Elf_Ehdr *hdr,
494 const Elf_Shdr *sechdrs, struct module *mod)
495 {
496 #ifdef CONFIG_DYNAMIC_FTRACE
497 struct plt_entry *ftrace_plts;
498
499 ftrace_plts = (void *)sechdrs->sh_addr;
500
501 ftrace_plts[FTRACE_PLT_IDX] = emit_plt_entry(FTRACE_ADDR);
502
503 if (IS_ENABLED(CONFIG_DYNAMIC_FTRACE_WITH_REGS))
504 ftrace_plts[FTRACE_REGS_PLT_IDX] = emit_plt_entry(FTRACE_REGS_ADDR);
505
506 mod->arch.ftrace_trampolines = ftrace_plts;
507 #endif
508 }
509
module_finalize(const Elf_Ehdr * hdr,const Elf_Shdr * sechdrs,struct module * mod)510 int module_finalize(const Elf_Ehdr *hdr,
511 const Elf_Shdr *sechdrs, struct module *mod)
512 {
513 const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
514 const Elf_Shdr *s, *alt = NULL, *orc = NULL, *orc_ip = NULL, *ftrace = NULL;
515
516 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
517 if (!strcmp(".altinstructions", secstrs + s->sh_name))
518 alt = s;
519 if (!strcmp(".orc_unwind", secstrs + s->sh_name))
520 orc = s;
521 if (!strcmp(".orc_unwind_ip", secstrs + s->sh_name))
522 orc_ip = s;
523 if (!strcmp(".ftrace_trampoline", secstrs + s->sh_name))
524 ftrace = s;
525 }
526
527 if (alt)
528 apply_alternatives((void *)alt->sh_addr, (void *)alt->sh_addr + alt->sh_size);
529
530 if (orc && orc_ip)
531 unwind_module_init(mod, (void *)orc_ip->sh_addr, orc_ip->sh_size, (void *)orc->sh_addr, orc->sh_size);
532
533 if (ftrace)
534 module_init_ftrace_plt(hdr, ftrace, mod);
535
536 return 0;
537 }
538