1 // SPDX-License-Identifier: GPL-2.0-only !! 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* 2 /*
3 * linux/arch/arm/kernel/module.c <<
4 * 3 *
5 * Copyright (C) 2002 Russell King. !! 4 * Copyright (C) 2001 Rusty Russell.
6 * Modified for nommu by Hyok S. Choi !! 5 * Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org)
7 * !! 6 * Copyright (C) 2005 Thiemo Seufer
8 * Module allocation method suggested by Andi <<
9 */ 7 */
10 #include <linux/module.h> !! 8
>> 9 #undef DEBUG
>> 10
>> 11 #include <linux/extable.h>
11 #include <linux/moduleloader.h> 12 #include <linux/moduleloader.h>
12 #include <linux/kernel.h> <<
13 #include <linux/mm.h> <<
14 #include <linux/elf.h> 13 #include <linux/elf.h>
>> 14 #include <linux/mm.h>
>> 15 #include <linux/numa.h>
>> 16 #include <linux/slab.h>
15 #include <linux/fs.h> 17 #include <linux/fs.h>
16 #include <linux/string.h> 18 #include <linux/string.h>
>> 19 #include <linux/kernel.h>
>> 20 #include <linux/spinlock.h>
>> 21 #include <linux/jump_label.h>
>> 22 #include <asm/jump_label.h>
>> 23
>> 24 struct mips_hi16 {
>> 25 struct mips_hi16 *next;
>> 26 Elf_Addr *addr;
>> 27 Elf_Addr value;
>> 28 };
17 29
18 #include <asm/sections.h> !! 30 static LIST_HEAD(dbe_list);
19 #include <asm/smp_plat.h> !! 31 static DEFINE_SPINLOCK(dbe_lock);
20 #include <asm/unwind.h> <<
21 #include <asm/opcodes.h> <<
22 32
23 bool module_init_section(const char *name) !! 33 static void apply_r_mips_32(u32 *location, u32 base, Elf_Addr v)
24 { 34 {
25 return strstarts(name, ".init") || !! 35 *location = base + v;
26 strstarts(name, ".ARM.extab.in <<
27 strstarts(name, ".ARM.exidx.in <<
28 } 36 }
29 37
30 bool module_exit_section(const char *name) !! 38 static int apply_r_mips_26(struct module *me, u32 *location, u32 base,
>> 39 Elf_Addr v)
31 { 40 {
32 return strstarts(name, ".exit") || !! 41 if (v % 4) {
33 strstarts(name, ".ARM.extab.ex !! 42 pr_err("module %s: dangerous R_MIPS_26 relocation\n",
34 strstarts(name, ".ARM.exidx.ex !! 43 me->name);
>> 44 return -ENOEXEC;
>> 45 }
>> 46
>> 47 if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) {
>> 48 pr_err("module %s: relocation overflow\n",
>> 49 me->name);
>> 50 return -ENOEXEC;
>> 51 }
>> 52
>> 53 *location = (*location & ~0x03ffffff) |
>> 54 ((base + (v >> 2)) & 0x03ffffff);
>> 55
>> 56 return 0;
35 } 57 }
36 58
37 #ifdef CONFIG_ARM_HAS_GROUP_RELOCS !! 59 static int apply_r_mips_hi16(struct module *me, u32 *location, Elf_Addr v,
38 /* !! 60 bool rela)
39 * This implements the partitioning algorithm <<
40 * documented in the ARM AArch32 ELF psABI (IH <<
41 * <<
42 * A single PC-relative symbol reference is di <<
43 * operations, where the final one could be in <<
44 * instruction with immediate offset. E.g., <<
45 * <<
46 * ADD Rd, PC, #... or <<
47 * ADD Rd, Rd, #... <<
48 * LDR Rd, [Rd, #...] <<
49 * <<
50 * The latter has a guaranteed range of only 1 <<
51 * of limited use in the kernel. However, the <<
52 * -/+ 256 MiB, (2x8 + 12 == 28 bits), which m <<
53 * any in-kernel symbol reference (unless modu <<
54 * <<
55 * The main advantage of this approach over th <<
56 * load is that literal loads may miss in the <<
57 * lower cache efficiency for variables that a <<
58 * different places in the code. <<
59 */ <<
60 static u32 get_group_rem(u32 group, u32 *offse <<
61 { 61 {
62 u32 val = *offset; !! 62 struct mips_hi16 *n;
63 u32 shift; <<
64 do { <<
65 shift = val ? (31 - __fls(val) <<
66 *offset = val; <<
67 if (!val) <<
68 break; <<
69 val &= 0xffffff >> shift; <<
70 } while (group--); <<
71 return shift; <<
72 } <<
73 #endif <<
74 <<
75 int <<
76 apply_relocate(Elf32_Shdr *sechdrs, const char <<
77 unsigned int relindex, struct m <<
78 { <<
79 Elf32_Shdr *symsec = sechdrs + syminde <<
80 Elf32_Shdr *relsec = sechdrs + relinde <<
81 Elf32_Shdr *dstsec = sechdrs + relsec- <<
82 Elf32_Rel *rel = (void *)relsec->sh_ad <<
83 unsigned int i; <<
84 <<
85 for (i = 0; i < relsec->sh_size / size <<
86 unsigned long loc; <<
87 Elf32_Sym *sym; <<
88 const char *symname; <<
89 #ifdef CONFIG_ARM_HAS_GROUP_RELOCS <<
90 u32 shift, group = 1; <<
91 #endif <<
92 s32 offset; <<
93 u32 tmp; <<
94 #ifdef CONFIG_THUMB2_KERNEL <<
95 u32 upper, lower, sign, j1, j2 <<
96 #endif <<
97 <<
98 offset = ELF32_R_SYM(rel->r_in <<
99 if (offset < 0 || offset > (sy <<
100 pr_err("%s: section %u <<
101 module->name, <<
102 return -ENOEXEC; <<
103 } <<
104 63
105 sym = ((Elf32_Sym *)symsec->sh !! 64 if (rela) {
106 symname = strtab + sym->st_nam !! 65 *location = (*location & 0xffff0000) |
>> 66 ((((long long) v + 0x8000LL) >> 16) & 0xffff);
>> 67 return 0;
>> 68 }
107 69
108 if (rel->r_offset < 0 || rel-> !! 70 /*
109 pr_err("%s: section %u !! 71 * We cannot relocate this one now because we don't know the value of
110 module->name, r !! 72 * the carry we need to add. Save the information, and let LO16 do the
111 rel->r_offset, !! 73 * actual relocation.
112 return -ENOEXEC; !! 74 */
113 } !! 75 n = kmalloc(sizeof *n, GFP_KERNEL);
>> 76 if (!n)
>> 77 return -ENOMEM;
>> 78
>> 79 n->addr = (Elf_Addr *)location;
>> 80 n->value = v;
>> 81 n->next = me->arch.r_mips_hi16_list;
>> 82 me->arch.r_mips_hi16_list = n;
114 83
115 loc = dstsec->sh_addr + rel->r !! 84 return 0;
>> 85 }
116 86
117 switch (ELF32_R_TYPE(rel->r_in !! 87 static void free_relocation_chain(struct mips_hi16 *l)
118 case R_ARM_NONE: !! 88 {
119 /* ignore */ !! 89 struct mips_hi16 *next;
120 break; <<
121 90
122 case R_ARM_ABS32: !! 91 while (l) {
123 case R_ARM_TARGET1: !! 92 next = l->next;
124 *(u32 *)loc += sym->st !! 93 kfree(l);
125 break; !! 94 l = next;
>> 95 }
>> 96 }
>> 97
>> 98 static int apply_r_mips_lo16(struct module *me, u32 *location,
>> 99 u32 base, Elf_Addr v, bool rela)
>> 100 {
>> 101 unsigned long insnlo = base;
>> 102 struct mips_hi16 *l;
>> 103 Elf_Addr val, vallo;
>> 104
>> 105 if (rela) {
>> 106 *location = (*location & 0xffff0000) | (v & 0xffff);
>> 107 return 0;
>> 108 }
126 109
127 case R_ARM_PC24: !! 110 /* Sign extend the addend we extract from the lo insn. */
128 case R_ARM_CALL: !! 111 vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000;
129 case R_ARM_JUMP24: <<
130 if (sym->st_value & 3) <<
131 pr_err("%s: se <<
132 module- <<
133 return -ENOEXE <<
134 } <<
135 <<
136 offset = __mem_to_opco <<
137 offset = (offset & 0x0 <<
138 offset = sign_extend32 <<
139 112
140 offset += sym->st_valu !! 113 if (me->arch.r_mips_hi16_list != NULL) {
>> 114 l = me->arch.r_mips_hi16_list;
>> 115 while (l != NULL) {
>> 116 struct mips_hi16 *next;
>> 117 unsigned long insn;
141 118
142 /* 119 /*
143 * Route through a PLT !! 120 * The value for the HI16 had best be the same.
144 * supported range. No <<
145 * contains the absolu <<
146 * @sym + addend, corr <<
147 */ 121 */
148 if (IS_ENABLED(CONFIG_ !! 122 if (v != l->value)
149 (offset <= (s32)0x !! 123 goto out_danger;
150 offset >= (s32)0x <<
151 offset = get_m <<
152 <<
153 - loc <<
154 <<
155 if (offset <= (s32)0xf <<
156 offset >= (s32)0x0 <<
157 pr_err("%s: se <<
158 module- <<
159 ELF32_R <<
160 sym->st <<
161 return -ENOEXE <<
162 } <<
163 124
164 offset >>= 2; !! 125 /*
165 offset &= 0x00ffffff; !! 126 * Do the HI16 relocation. Note that we actually don't
>> 127 * need to know anything about the LO16 itself, except
>> 128 * where to find the low 16 bits of the addend needed
>> 129 * by the LO16.
>> 130 */
>> 131 insn = *l->addr;
>> 132 val = ((insn & 0xffff) << 16) + vallo;
>> 133 val += v;
166 134
167 *(u32 *)loc &= __opcod !! 135 /*
168 *(u32 *)loc |= __opcod !! 136 * Account for the sign extension that will happen in
169 break; !! 137 * the low bits.
>> 138 */
>> 139 val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff;
170 140
171 case R_ARM_V4BX: !! 141 insn = (insn & ~0xffff) | val;
172 /* Preserve Rm and the !! 142 *l->addr = insn;
173 * other bits to re-cod <<
174 * MOV PC,Rm. <<
175 */ <<
176 *(u32 *)loc &= __opcode <<
177 *(u32 *)loc |= __opcode <<
178 break; <<
179 <<
180 case R_ARM_PREL31: <<
181 offset = (*(s32 *)loc <<
182 offset += sym->st_valu <<
183 if (offset >= 0x400000 <<
184 pr_err("%s: se <<
185 module- <<
186 ELF32_R <<
187 sym->st <<
188 return -ENOEXE <<
189 } <<
190 *(u32 *)loc &= 0x80000 <<
191 *(u32 *)loc |= offset <<
192 break; <<
193 143
194 case R_ARM_REL32: !! 144 next = l->next;
195 *(u32 *)loc += sym->st !! 145 kfree(l);
196 break; !! 146 l = next;
>> 147 }
197 148
198 case R_ARM_MOVW_ABS_NC: !! 149 me->arch.r_mips_hi16_list = NULL;
199 case R_ARM_MOVT_ABS: !! 150 }
200 case R_ARM_MOVW_PREL_NC: <<
201 case R_ARM_MOVT_PREL: <<
202 offset = tmp = __mem_t <<
203 offset = ((offset & 0x <<
204 offset = sign_extend32 <<
205 <<
206 offset += sym->st_valu <<
207 if (ELF32_R_TYPE(rel-> <<
208 ELF32_R_TYPE(rel-> <<
209 offset -= loc; <<
210 if (ELF32_R_TYPE(rel-> <<
211 ELF32_R_TYPE(rel-> <<
212 offset >>= 16; <<
213 <<
214 tmp &= 0xfff0f000; <<
215 tmp |= ((offset & 0xf0 <<
216 (offset & 0x0f <<
217 151
218 *(u32 *)loc = __opcode !! 152 /*
219 break; !! 153 * Ok, we're done with the HI16 relocs. Now deal with the LO16.
>> 154 */
>> 155 val = v + vallo;
>> 156 insnlo = (insnlo & ~0xffff) | (val & 0xffff);
>> 157 *location = insnlo;
220 158
221 #ifdef CONFIG_ARM_HAS_GROUP_RELOCS !! 159 return 0;
222 case R_ARM_ALU_PC_G0_NC: <<
223 group = 0; <<
224 fallthrough; <<
225 case R_ARM_ALU_PC_G1_NC: <<
226 tmp = __mem_to_opcode_ <<
227 offset = ror32(tmp & 0 <<
228 if (tmp & BIT(22)) <<
229 offset = -offs <<
230 offset += sym->st_valu <<
231 if (offset < 0) { <<
232 offset = -offs <<
233 tmp = (tmp & ~ <<
234 } else { <<
235 tmp = (tmp & ~ <<
236 } <<
237 <<
238 shift = get_group_rem( <<
239 if (shift < 24) { <<
240 offset >>= 24 <<
241 offset |= (shi <<
242 } <<
243 *(u32 *)loc = __opcode <<
244 break; <<
245 160
246 case R_ARM_LDR_PC_G2: !! 161 out_danger:
247 tmp = __mem_to_opcode_ !! 162 free_relocation_chain(l);
248 offset = tmp & 0xfff; !! 163 me->arch.r_mips_hi16_list = NULL;
249 if (~tmp & BIT(23)) <<
250 offset = -offs <<
251 offset += sym->st_valu <<
252 if (offset < 0) { <<
253 offset = -offs <<
254 tmp &= ~BIT(23 <<
255 } else { <<
256 tmp |= BIT(23) <<
257 } <<
258 get_group_rem(2, &offs <<
259 <<
260 if (offset > 0xfff) { <<
261 pr_err("%s: se <<
262 module- <<
263 ELF32_R <<
264 sym->st <<
265 return -ENOEXE <<
266 } <<
267 *(u32 *)loc = __opcode <<
268 break; <<
269 #endif <<
270 #ifdef CONFIG_THUMB2_KERNEL <<
271 case R_ARM_THM_CALL: <<
272 case R_ARM_THM_JUMP24: <<
273 /* <<
274 * For function symbol <<
275 * allowed (no interwo <<
276 * <<
277 * For non-function sy <<
278 * has no specific ARM <<
279 * the branch is resol <<
280 * that interworking i <<
281 */ <<
282 if (ELF32_ST_TYPE(sym- <<
283 !(sym->st_value & <<
284 pr_err("%s: se <<
285 module- <<
286 return -ENOEXE <<
287 } <<
288 164
289 upper = __mem_to_opcod !! 165 pr_err("module %s: dangerous R_MIPS_LO16 relocation\n", me->name);
290 lower = __mem_to_opcod <<
291 166
292 /* !! 167 return -ENOEXEC;
293 * 25 bit signed addre !! 168 }
294 * instructions): <<
295 * S:I1:I2:imm10:imm <<
296 * where: <<
297 * S = upper[10] <<
298 * I1 = ~(J1 ^ S) <<
299 * I2 = ~(J2 ^ S) <<
300 * imm10 = upper[9:0 <<
301 * imm11 = lower[10: <<
302 * J1 = lower[13] <<
303 * J2 = lower[11] <<
304 */ <<
305 sign = (upper >> 10) & <<
306 j1 = (lower >> 13) & 1 <<
307 j2 = (lower >> 11) & 1 <<
308 offset = (sign << 24) <<
309 ((~(j2 ^ sign) <<
310 ((upper & 0x03 <<
311 ((lower & 0x07 <<
312 offset = sign_extend32 <<
313 offset += sym->st_valu <<
314 169
315 /* !! 170 static int apply_r_mips_pc(struct module *me, u32 *location, u32 base,
316 * Route through a PLT !! 171 Elf_Addr v, unsigned int bits)
317 * supported range. !! 172 {
318 */ !! 173 unsigned long mask = GENMASK(bits - 1, 0);
319 if (IS_ENABLED(CONFIG_ !! 174 unsigned long se_bits;
320 (offset <= (s32)0x !! 175 long offset;
321 offset >= (s32)0x !! 176
322 offset = get_m !! 177 if (v % 4) {
323 !! 178 pr_err("module %s: dangerous R_MIPS_PC%u relocation\n",
324 - loc !! 179 me->name, bits);
325 !! 180 return -ENOEXEC;
326 if (offset <= (s32)0xf !! 181 }
327 offset >= (s32)0x0 <<
328 pr_err("%s: se <<
329 module- <<
330 ELF32_R <<
331 sym->st <<
332 return -ENOEXE <<
333 } <<
334 <<
335 sign = (offset >> 24) <<
336 j1 = sign ^ (~(offset <<
337 j2 = sign ^ (~(offset <<
338 upper = (u16)((upper & <<
339 (( <<
340 lower = (u16)((lower & <<
341 (j1 << 1 <<
342 ((offset <<
343 182
344 *(u16 *)loc = __opcode !! 183 /* retrieve & sign extend implicit addend if any */
345 *(u16 *)(loc + 2) = __ !! 184 offset = base & mask;
346 break; !! 185 offset |= (offset & BIT(bits - 1)) ? ~mask : 0;
>> 186
>> 187 offset += ((long)v - (long)location) >> 2;
>> 188
>> 189 /* check the sign bit onwards are identical - ie. we didn't overflow */
>> 190 se_bits = (offset & BIT(bits - 1)) ? ~0ul : 0;
>> 191 if ((offset & ~mask) != (se_bits & ~mask)) {
>> 192 pr_err("module %s: relocation overflow\n", me->name);
>> 193 return -ENOEXEC;
>> 194 }
347 195
348 case R_ARM_THM_MOVW_ABS_NC: !! 196 *location = (*location & ~mask) | (offset & mask);
349 case R_ARM_THM_MOVT_ABS: <<
350 case R_ARM_THM_MOVW_PREL_NC: <<
351 case R_ARM_THM_MOVT_PREL: <<
352 upper = __mem_to_opcod <<
353 lower = __mem_to_opcod <<
354 197
355 /* !! 198 return 0;
356 * MOVT/MOVW instructi !! 199 }
357 * !! 200
358 * i = upper[10] !! 201 static int apply_r_mips_pc16(struct module *me, u32 *location, u32 base,
359 * imm4 = upper[3:0] !! 202 Elf_Addr v)
360 * imm3 = lower[14:12] !! 203 {
361 * imm8 = lower[7:0] !! 204 return apply_r_mips_pc(me, location, base, v, 16);
362 * !! 205 }
363 * imm16 = imm4:i:imm3 !! 206
364 */ !! 207 static int apply_r_mips_pc21(struct module *me, u32 *location, u32 base,
365 offset = ((upper & 0x0 !! 208 Elf_Addr v)
366 ((upper & 0x04 !! 209 {
367 ((lower & 0x70 !! 210 return apply_r_mips_pc(me, location, base, v, 21);
368 offset = sign_extend32 !! 211 }
369 offset += sym->st_valu !! 212
370 !! 213 static int apply_r_mips_pc26(struct module *me, u32 *location, u32 base,
371 if (ELF32_R_TYPE(rel-> !! 214 Elf_Addr v)
372 ELF32_R_TYPE(rel-> !! 215 {
373 offset -= loc; !! 216 return apply_r_mips_pc(me, location, base, v, 26);
374 if (ELF32_R_TYPE(rel-> !! 217 }
375 ELF32_R_TYPE(rel-> !! 218
376 offset >>= 16; !! 219 static int apply_r_mips_64(u32 *location, Elf_Addr v, bool rela)
377 !! 220 {
378 upper = (u16)((upper & !! 221 if (WARN_ON(!rela))
379 ((offset !! 222 return -EINVAL;
380 ((offset !! 223
381 lower = (u16)((lower & !! 224 *(Elf_Addr *)location = v;
382 ((offset <<
383 (offset <<
384 *(u16 *)loc = __opcode <<
385 *(u16 *)(loc + 2) = __ <<
386 break; <<
387 #endif <<
388 225
389 default: <<
390 pr_err("%s: unknown re <<
391 module->name, E <<
392 return -ENOEXEC; <<
393 } <<
394 } <<
395 return 0; 226 return 0;
396 } 227 }
397 228
398 static const Elf_Shdr *find_mod_section(const !! 229 static int apply_r_mips_higher(u32 *location, Elf_Addr v, bool rela)
399 const Elf_Shdr *sechdrs, const char *n <<
400 { 230 {
401 const Elf_Shdr *s, *se; !! 231 if (WARN_ON(!rela))
402 const char *secstrs = (void *)hdr + se !! 232 return -EINVAL;
403 233
404 for (s = sechdrs, se = sechdrs + hdr-> !! 234 *location = (*location & 0xffff0000) |
405 if (strcmp(name, secstrs + s-> !! 235 ((((long long)v + 0x80008000LL) >> 32) & 0xffff);
406 return s; <<
407 236
408 return NULL; !! 237 return 0;
409 } 238 }
410 239
411 extern void fixup_pv_table(const void *, unsig !! 240 static int apply_r_mips_highest(u32 *location, Elf_Addr v, bool rela)
412 extern void fixup_smp(const void *, unsigned l !! 241 {
>> 242 if (WARN_ON(!rela))
>> 243 return -EINVAL;
413 244
414 int module_finalize(const Elf32_Ehdr *hdr, con !! 245 *location = (*location & 0xffff0000) |
415 struct module *mod) !! 246 ((((long long)v + 0x800080008000LL) >> 48) & 0xffff);
>> 247
>> 248 return 0;
>> 249 }
>> 250
>> 251 /**
>> 252 * reloc_handler() - Apply a particular relocation to a module
>> 253 * @type: type of the relocation to apply
>> 254 * @me: the module to apply the reloc to
>> 255 * @location: the address at which the reloc is to be applied
>> 256 * @base: the existing value at location for REL-style; 0 for RELA-style
>> 257 * @v: the value of the reloc, with addend for RELA-style
>> 258 * @rela: indication of is this a RELA (true) or REL (false) relocation
>> 259 *
>> 260 * Each implemented relocation function applies a particular type of
>> 261 * relocation to the module @me. Relocs that may be found in either REL or RELA
>> 262 * variants can be handled by making use of the @base & @v parameters which are
>> 263 * set to values which abstract the difference away from the particular reloc
>> 264 * implementations.
>> 265 *
>> 266 * Return: 0 upon success, else -ERRNO
>> 267 */
>> 268 static int reloc_handler(u32 type, struct module *me, u32 *location, u32 base,
>> 269 Elf_Addr v, bool rela)
416 { 270 {
417 const Elf_Shdr *s = NULL; !! 271 switch (type) {
418 #ifdef CONFIG_ARM_UNWIND !! 272 case R_MIPS_NONE:
419 const char *secstrs = (void *)hdr + se !! 273 break;
420 const Elf_Shdr *sechdrs_end = sechdrs !! 274 case R_MIPS_32:
421 struct list_head *unwind_list = &mod-> !! 275 apply_r_mips_32(location, base, v);
>> 276 break;
>> 277 case R_MIPS_26:
>> 278 return apply_r_mips_26(me, location, base, v);
>> 279 case R_MIPS_HI16:
>> 280 return apply_r_mips_hi16(me, location, v, rela);
>> 281 case R_MIPS_LO16:
>> 282 return apply_r_mips_lo16(me, location, base, v, rela);
>> 283 case R_MIPS_PC16:
>> 284 return apply_r_mips_pc16(me, location, base, v);
>> 285 case R_MIPS_PC21_S2:
>> 286 return apply_r_mips_pc21(me, location, base, v);
>> 287 case R_MIPS_PC26_S2:
>> 288 return apply_r_mips_pc26(me, location, base, v);
>> 289 case R_MIPS_64:
>> 290 return apply_r_mips_64(location, v, rela);
>> 291 case R_MIPS_HIGHER:
>> 292 return apply_r_mips_higher(location, v, rela);
>> 293 case R_MIPS_HIGHEST:
>> 294 return apply_r_mips_highest(location, v, rela);
>> 295 default:
>> 296 pr_err("%s: Unknown relocation type %u\n", me->name, type);
>> 297 return -EINVAL;
>> 298 }
422 299
423 INIT_LIST_HEAD(unwind_list); !! 300 return 0;
424 mod->arch.init_table = NULL; !! 301 }
425 302
426 for (s = sechdrs; s < sechdrs_end; s++ !! 303 static int __apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
427 const char *secname = secstrs !! 304 unsigned int symindex, unsigned int relsec,
428 const char *txtname; !! 305 struct module *me, bool rela)
429 const Elf_Shdr *txt_sec; !! 306 {
>> 307 union {
>> 308 Elf_Mips_Rel *rel;
>> 309 Elf_Mips_Rela *rela;
>> 310 } r;
>> 311 Elf_Sym *sym;
>> 312 u32 *location, base;
>> 313 unsigned int i, type;
>> 314 Elf_Addr v;
>> 315 int err = 0;
>> 316 size_t reloc_sz;
>> 317
>> 318 pr_debug("Applying relocate section %u to %u\n", relsec,
>> 319 sechdrs[relsec].sh_info);
>> 320
>> 321 r.rel = (void *)sechdrs[relsec].sh_addr;
>> 322 reloc_sz = rela ? sizeof(*r.rela) : sizeof(*r.rel);
>> 323 me->arch.r_mips_hi16_list = NULL;
>> 324 for (i = 0; i < sechdrs[relsec].sh_size / reloc_sz; i++) {
>> 325 /* This is where to make the change */
>> 326 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
>> 327 + r.rel->r_offset;
>> 328 /* This is the symbol it is referring to */
>> 329 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
>> 330 + ELF_MIPS_R_SYM(*r.rel);
>> 331 if (sym->st_value >= -MAX_ERRNO) {
>> 332 /* Ignore unresolved weak symbol */
>> 333 if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
>> 334 continue;
>> 335 pr_warn("%s: Unknown symbol %s\n",
>> 336 me->name, strtab + sym->st_name);
>> 337 err = -ENOENT;
>> 338 goto out;
>> 339 }
430 340
431 if (!(s->sh_flags & SHF_ALLOC) !! 341 type = ELF_MIPS_R_TYPE(*r.rel);
432 s->sh_type != ELF_SECTION_ <<
433 continue; <<
434 342
435 if (!strcmp(".ARM.exidx", secn !! 343 if (rela) {
436 txtname = ".text"; !! 344 v = sym->st_value + r.rela->r_addend;
437 else !! 345 base = 0;
438 txtname = secname + st !! 346 r.rela = &r.rela[1];
439 txt_sec = find_mod_section(hdr !! 347 } else {
440 !! 348 v = sym->st_value;
441 if (txt_sec) { !! 349 base = *location;
442 struct unwind_table *t !! 350 r.rel = &r.rel[1];
443 unwind_table_a <<
444 <<
445 <<
446 <<
447 <<
448 list_add(&table->mod_l <<
449 <<
450 /* save init table for <<
451 if (strcmp(".ARM.exidx <<
452 mod->arch.init <<
453 } 351 }
>> 352
>> 353 err = reloc_handler(type, me, location, base, v, rela);
>> 354 if (err)
>> 355 goto out;
454 } 356 }
455 #endif !! 357
456 #ifdef CONFIG_ARM_PATCH_PHYS_VIRT !! 358 out:
457 s = find_mod_section(hdr, sechdrs, ".p !! 359 /*
458 if (s) !! 360 * Normally the hi16 list should be deallocated at this point. A
459 fixup_pv_table((void *)s->sh_a !! 361 * malformed binary however could contain a series of R_MIPS_HI16
460 #endif !! 362 * relocations not followed by a R_MIPS_LO16 relocation, or if we hit
461 s = find_mod_section(hdr, sechdrs, ".a !! 363 * an error processing a reloc we might have gotten here before
462 if (s && !is_smp()) !! 364 * reaching the R_MIPS_LO16. In either case, free up the list and
463 #ifdef CONFIG_SMP_ON_UP !! 365 * return an error.
464 fixup_smp((void *)s->sh_addr, !! 366 */
465 #else !! 367 if (me->arch.r_mips_hi16_list) {
466 return -EINVAL; !! 368 free_relocation_chain(me->arch.r_mips_hi16_list);
467 #endif !! 369 me->arch.r_mips_hi16_list = NULL;
468 return 0; !! 370 err = err ?: -ENOEXEC;
>> 371 }
>> 372
>> 373 return err;
469 } 374 }
470 375
471 void !! 376 int apply_relocate(Elf_Shdr *sechdrs, const char *strtab,
472 module_arch_cleanup(struct module *mod) !! 377 unsigned int symindex, unsigned int relsec,
>> 378 struct module *me)
473 { 379 {
474 #ifdef CONFIG_ARM_UNWIND !! 380 return __apply_relocate(sechdrs, strtab, symindex, relsec, me, false);
475 struct unwind_table *tmp; !! 381 }
476 struct unwind_table *n; <<
477 382
478 list_for_each_entry_safe(tmp, n, !! 383 #ifdef CONFIG_MODULES_USE_ELF_RELA
479 &mod->arch.unwind_list !! 384 int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
480 list_del(&tmp->mod_list); !! 385 unsigned int symindex, unsigned int relsec,
481 unwind_table_del(tmp); !! 386 struct module *me)
>> 387 {
>> 388 return __apply_relocate(sechdrs, strtab, symindex, relsec, me, true);
>> 389 }
>> 390 #endif /* CONFIG_MODULES_USE_ELF_RELA */
>> 391
>> 392 /* Given an address, look for it in the module exception tables. */
>> 393 const struct exception_table_entry *search_module_dbetables(unsigned long addr)
>> 394 {
>> 395 unsigned long flags;
>> 396 const struct exception_table_entry *e = NULL;
>> 397 struct mod_arch_specific *dbe;
>> 398
>> 399 spin_lock_irqsave(&dbe_lock, flags);
>> 400 list_for_each_entry(dbe, &dbe_list, dbe_list) {
>> 401 e = search_extable(dbe->dbe_start,
>> 402 dbe->dbe_end - dbe->dbe_start, addr);
>> 403 if (e)
>> 404 break;
482 } 405 }
483 mod->arch.init_table = NULL; !! 406 spin_unlock_irqrestore(&dbe_lock, flags);
484 #endif !! 407
>> 408 /* Now, if we found one, we are running inside it now, hence
>> 409 we cannot unload the module, hence no refcnt needed. */
>> 410 return e;
485 } 411 }
486 412
487 void __weak module_arch_freeing_init(struct mo !! 413 /* Put in dbe list if necessary. */
>> 414 int module_finalize(const Elf_Ehdr *hdr,
>> 415 const Elf_Shdr *sechdrs,
>> 416 struct module *me)
488 { 417 {
489 #ifdef CONFIG_ARM_UNWIND !! 418 const Elf_Shdr *s;
490 struct unwind_table *init = mod->arch. !! 419 char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
>> 420
>> 421 if (IS_ENABLED(CONFIG_JUMP_LABEL))
>> 422 jump_label_apply_nops(me);
491 423
492 if (init) { !! 424 INIT_LIST_HEAD(&me->arch.dbe_list);
493 mod->arch.init_table = NULL; !! 425 for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) {
494 list_del(&init->mod_list); !! 426 if (strcmp("__dbe_table", secstrings + s->sh_name) != 0)
495 unwind_table_del(init); !! 427 continue;
>> 428 me->arch.dbe_start = (void *)s->sh_addr;
>> 429 me->arch.dbe_end = (void *)s->sh_addr + s->sh_size;
>> 430 spin_lock_irq(&dbe_lock);
>> 431 list_add(&me->arch.dbe_list, &dbe_list);
>> 432 spin_unlock_irq(&dbe_lock);
496 } 433 }
497 #endif !! 434 return 0;
>> 435 }
>> 436
>> 437 void module_arch_cleanup(struct module *mod)
>> 438 {
>> 439 spin_lock_irq(&dbe_lock);
>> 440 list_del(&mod->arch.dbe_list);
>> 441 spin_unlock_irq(&dbe_lock);
498 } 442 }
499 443
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