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hugetlb: introduce generic version of hugetlb_free_pgd_range
[linux/fpc-iii.git] / arch / riscv / kernel / module.c
blob3303ed2cd4193f82c51730a992d6c875b361ff80
1 /*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * Copyright (C) 2017 Zihao Yu
13 */
14
15 #include <linux/elf.h>
16 #include <linux/err.h>
17 #include <linux/errno.h>
18 #include <linux/moduleloader.h>
19
20 static int apply_r_riscv_32_rela(struct module *me, u32 *location, Elf_Addr v)
21 {
22 if (v != (u32)v) {
23 pr_err("%s: value %016llx out of range for 32-bit field\n",
24 me->name, v);
25 return -EINVAL;
26 }
27 *location = v;
28 return 0;
29 }
30
31 static int apply_r_riscv_64_rela(struct module *me, u32 *location, Elf_Addr v)
32 {
33 *(u64 *)location = v;
34 return 0;
35 }
36
37 static int apply_r_riscv_branch_rela(struct module *me, u32 *location,
38 Elf_Addr v)
39 {
40 ptrdiff_t offset = (void *)v - (void *)location;
41 u32 imm12 = (offset & 0x1000) << (31 - 12);
42 u32 imm11 = (offset & 0x800) >> (11 - 7);
43 u32 imm10_5 = (offset & 0x7e0) << (30 - 10);
44 u32 imm4_1 = (offset & 0x1e) << (11 - 4);
45
46 *location = (*location & 0x1fff07f) | imm12 | imm11 | imm10_5 | imm4_1;
47 return 0;
48 }
49
50 static int apply_r_riscv_jal_rela(struct module *me, u32 *location,
51 Elf_Addr v)
52 {
53 ptrdiff_t offset = (void *)v - (void *)location;
54 u32 imm20 = (offset & 0x100000) << (31 - 20);
55 u32 imm19_12 = (offset & 0xff000);
56 u32 imm11 = (offset & 0x800) << (20 - 11);
57 u32 imm10_1 = (offset & 0x7fe) << (30 - 10);
58
59 *location = (*location & 0xfff) | imm20 | imm19_12 | imm11 | imm10_1;
60 return 0;
61 }
62
63 static int apply_r_riscv_rcv_branch_rela(struct module *me, u32 *location,
64 Elf_Addr v)
65 {
66 ptrdiff_t offset = (void *)v - (void *)location;
67 u16 imm8 = (offset & 0x100) << (12 - 8);
68 u16 imm7_6 = (offset & 0xc0) >> (6 - 5);
69 u16 imm5 = (offset & 0x20) >> (5 - 2);
70 u16 imm4_3 = (offset & 0x18) << (12 - 5);
71 u16 imm2_1 = (offset & 0x6) << (12 - 10);
72
73 *(u16 *)location = (*(u16 *)location & 0xe383) |
74 imm8 | imm7_6 | imm5 | imm4_3 | imm2_1;
75 return 0;
76 }
77
78 static int apply_r_riscv_rvc_jump_rela(struct module *me, u32 *location,
79 Elf_Addr v)
80 {
81 ptrdiff_t offset = (void *)v - (void *)location;
82 u16 imm11 = (offset & 0x800) << (12 - 11);
83 u16 imm10 = (offset & 0x400) >> (10 - 8);
84 u16 imm9_8 = (offset & 0x300) << (12 - 11);
85 u16 imm7 = (offset & 0x80) >> (7 - 6);
86 u16 imm6 = (offset & 0x40) << (12 - 11);
87 u16 imm5 = (offset & 0x20) >> (5 - 2);
88 u16 imm4 = (offset & 0x10) << (12 - 5);
89 u16 imm3_1 = (offset & 0xe) << (12 - 10);
90
91 *(u16 *)location = (*(u16 *)location & 0xe003) |
92 imm11 | imm10 | imm9_8 | imm7 | imm6 | imm5 | imm4 | imm3_1;
93 return 0;
94 }
95
96 static int apply_r_riscv_pcrel_hi20_rela(struct module *me, u32 *location,
97 Elf_Addr v)
98 {
99 ptrdiff_t offset = (void *)v - (void *)location;
100 s32 hi20;
101
102 if (offset != (s32)offset) {
103 pr_err(
104 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
105 me->name, v, location);
106 return -EINVAL;
107 }
108
109 hi20 = (offset + 0x800) & 0xfffff000;
110 *location = (*location & 0xfff) | hi20;
111 return 0;
112 }
113
114 static int apply_r_riscv_pcrel_lo12_i_rela(struct module *me, u32 *location,
115 Elf_Addr v)
116 {
117 /*
118 * v is the lo12 value to fill. It is calculated before calling this
119 * handler.
120 */
121 *location = (*location & 0xfffff) | ((v & 0xfff) << 20);
122 return 0;
123 }
124
125 static int apply_r_riscv_pcrel_lo12_s_rela(struct module *me, u32 *location,
126 Elf_Addr v)
127 {
128 /*
129 * v is the lo12 value to fill. It is calculated before calling this
130 * handler.
131 */
132 u32 imm11_5 = (v & 0xfe0) << (31 - 11);
133 u32 imm4_0 = (v & 0x1f) << (11 - 4);
134
135 *location = (*location & 0x1fff07f) | imm11_5 | imm4_0;
136 return 0;
137 }
138
139 static int apply_r_riscv_hi20_rela(struct module *me, u32 *location,
140 Elf_Addr v)
141 {
142 s32 hi20;
143
144 if (IS_ENABLED(CMODEL_MEDLOW)) {
145 pr_err(
146 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
147 me->name, v, location);
148 return -EINVAL;
149 }
150
151 hi20 = ((s32)v + 0x800) & 0xfffff000;
152 *location = (*location & 0xfff) | hi20;
153 return 0;
154 }
155
156 static int apply_r_riscv_lo12_i_rela(struct module *me, u32 *location,
157 Elf_Addr v)
158 {
159 /* Skip medlow checking because of filtering by HI20 already */
160 s32 hi20 = ((s32)v + 0x800) & 0xfffff000;
161 s32 lo12 = ((s32)v - hi20);
162 *location = (*location & 0xfffff) | ((lo12 & 0xfff) << 20);
163 return 0;
164 }
165
166 static int apply_r_riscv_lo12_s_rela(struct module *me, u32 *location,
167 Elf_Addr v)
168 {
169 /* Skip medlow checking because of filtering by HI20 already */
170 s32 hi20 = ((s32)v + 0x800) & 0xfffff000;
171 s32 lo12 = ((s32)v - hi20);
172 u32 imm11_5 = (lo12 & 0xfe0) << (31 - 11);
173 u32 imm4_0 = (lo12 & 0x1f) << (11 - 4);
174 *location = (*location & 0x1fff07f) | imm11_5 | imm4_0;
175 return 0;
176 }
177
178 static int apply_r_riscv_got_hi20_rela(struct module *me, u32 *location,
179 Elf_Addr v)
180 {
181 ptrdiff_t offset = (void *)v - (void *)location;
182 s32 hi20;
183
184 /* Always emit the got entry */
185 if (IS_ENABLED(CONFIG_MODULE_SECTIONS)) {
186 offset = module_emit_got_entry(me, v);
187 offset = (void *)offset - (void *)location;
188 } else {
189 pr_err(
190 "%s: can not generate the GOT entry for symbol = %016llx from PC = %p\n",
191 me->name, v, location);
192 return -EINVAL;
193 }
194
195 hi20 = (offset + 0x800) & 0xfffff000;
196 *location = (*location & 0xfff) | hi20;
197 return 0;
198 }
199
200 static int apply_r_riscv_call_plt_rela(struct module *me, u32 *location,
201 Elf_Addr v)
202 {
203 ptrdiff_t offset = (void *)v - (void *)location;
204 s32 fill_v = offset;
205 u32 hi20, lo12;
206
207 if (offset != fill_v) {
208 /* Only emit the plt entry if offset over 32-bit range */
209 if (IS_ENABLED(CONFIG_MODULE_SECTIONS)) {
210 offset = module_emit_plt_entry(me, v);
211 offset = (void *)offset - (void *)location;
212 } else {
213 pr_err(
214 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
215 me->name, v, location);
216 return -EINVAL;
217 }
218 }
219
220 hi20 = (offset + 0x800) & 0xfffff000;
221 lo12 = (offset - hi20) & 0xfff;
222 *location = (*location & 0xfff) | hi20;
223 *(location + 1) = (*(location + 1) & 0xfffff) | (lo12 << 20);
224 return 0;
225 }
226
227 static int apply_r_riscv_call_rela(struct module *me, u32 *location,
228 Elf_Addr v)
229 {
230 ptrdiff_t offset = (void *)v - (void *)location;
231 s32 fill_v = offset;
232 u32 hi20, lo12;
233
234 if (offset != fill_v) {
235 pr_err(
236 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
237 me->name, v, location);
238 return -EINVAL;
239 }
240
241 hi20 = (offset + 0x800) & 0xfffff000;
242 lo12 = (offset - hi20) & 0xfff;
243 *location = (*location & 0xfff) | hi20;
244 *(location + 1) = (*(location + 1) & 0xfffff) | (lo12 << 20);
245 return 0;
246 }
247
248 static int apply_r_riscv_relax_rela(struct module *me, u32 *location,
249 Elf_Addr v)
250 {
251 return 0;
252 }
253
254 static int apply_r_riscv_align_rela(struct module *me, u32 *location,
255 Elf_Addr v)
256 {
257 pr_err(
258 "%s: The unexpected relocation type 'R_RISCV_ALIGN' from PC = %p\n",
259 me->name, location);
260 return -EINVAL;
261 }
262
263 static int apply_r_riscv_add32_rela(struct module *me, u32 *location,
264 Elf_Addr v)
265 {
266 *(u32 *)location += (u32)v;
267 return 0;
268 }
269
270 static int apply_r_riscv_sub32_rela(struct module *me, u32 *location,
271 Elf_Addr v)
272 {
273 *(u32 *)location -= (u32)v;
274 return 0;
275 }
276
277 static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
278 Elf_Addr v) = {
279 [R_RISCV_32] = apply_r_riscv_32_rela,
280 [R_RISCV_64] = apply_r_riscv_64_rela,
281 [R_RISCV_BRANCH] = apply_r_riscv_branch_rela,
282 [R_RISCV_JAL] = apply_r_riscv_jal_rela,
283 [R_RISCV_RVC_BRANCH] = apply_r_riscv_rcv_branch_rela,
284 [R_RISCV_RVC_JUMP] = apply_r_riscv_rvc_jump_rela,
285 [R_RISCV_PCREL_HI20] = apply_r_riscv_pcrel_hi20_rela,
286 [R_RISCV_PCREL_LO12_I] = apply_r_riscv_pcrel_lo12_i_rela,
287 [R_RISCV_PCREL_LO12_S] = apply_r_riscv_pcrel_lo12_s_rela,
288 [R_RISCV_HI20] = apply_r_riscv_hi20_rela,
289 [R_RISCV_LO12_I] = apply_r_riscv_lo12_i_rela,
290 [R_RISCV_LO12_S] = apply_r_riscv_lo12_s_rela,
291 [R_RISCV_GOT_HI20] = apply_r_riscv_got_hi20_rela,
292 [R_RISCV_CALL_PLT] = apply_r_riscv_call_plt_rela,
293 [R_RISCV_CALL] = apply_r_riscv_call_rela,
294 [R_RISCV_RELAX] = apply_r_riscv_relax_rela,
295 [R_RISCV_ALIGN] = apply_r_riscv_align_rela,
296 [R_RISCV_ADD32] = apply_r_riscv_add32_rela,
297 [R_RISCV_SUB32] = apply_r_riscv_sub32_rela,
298 };
299
300 int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
301 unsigned int symindex, unsigned int relsec,
302 struct module *me)
303 {
304 Elf_Rela *rel = (void *) sechdrs[relsec].sh_addr;
305 int (*handler)(struct module *me, u32 *location, Elf_Addr v);
306 Elf_Sym *sym;
307 u32 *location;
308 unsigned int i, type;
309 Elf_Addr v;
310 int res;
311
312 pr_debug("Applying relocate section %u to %u\n", relsec,
313 sechdrs[relsec].sh_info);
314
315 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
316 /* This is where to make the change */
317 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
318 + rel[i].r_offset;
319 /* This is the symbol it is referring to */
320 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
321 + ELF_RISCV_R_SYM(rel[i].r_info);
322 if (IS_ERR_VALUE(sym->st_value)) {
323 /* Ignore unresolved weak symbol */
324 if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
325 continue;
326 pr_warning("%s: Unknown symbol %s\n",
327 me->name, strtab + sym->st_name);
328 return -ENOENT;
329 }
330
331 type = ELF_RISCV_R_TYPE(rel[i].r_info);
332
333 if (type < ARRAY_SIZE(reloc_handlers_rela))
334 handler = reloc_handlers_rela[type];
335 else
336 handler = NULL;
337
338 if (!handler) {
339 pr_err("%s: Unknown relocation type %u\n",
340 me->name, type);
341 return -EINVAL;
342 }
343
344 v = sym->st_value + rel[i].r_addend;
345
346 if (type == R_RISCV_PCREL_LO12_I || type == R_RISCV_PCREL_LO12_S) {
347 unsigned int j;
348
349 for (j = 0; j < sechdrs[relsec].sh_size / sizeof(*rel); j++) {
350 unsigned long hi20_loc =
351 sechdrs[sechdrs[relsec].sh_info].sh_addr
352 + rel[j].r_offset;
353 u32 hi20_type = ELF_RISCV_R_TYPE(rel[j].r_info);
354
355 /* Find the corresponding HI20 relocation entry */
356 if (hi20_loc == sym->st_value
357 && (hi20_type == R_RISCV_PCREL_HI20
358 || hi20_type == R_RISCV_GOT_HI20)) {
359 s32 hi20, lo12;
360 Elf_Sym *hi20_sym =
361 (Elf_Sym *)sechdrs[symindex].sh_addr
362 + ELF_RISCV_R_SYM(rel[j].r_info);
363 unsigned long hi20_sym_val =
364 hi20_sym->st_value
365 + rel[j].r_addend;
366
367 /* Calculate lo12 */
368 size_t offset = hi20_sym_val - hi20_loc;
369 if (IS_ENABLED(CONFIG_MODULE_SECTIONS)
370 && hi20_type == R_RISCV_GOT_HI20) {
371 offset = module_emit_got_entry(
372 me, hi20_sym_val);
373 offset = offset - hi20_loc;
374 }
375 hi20 = (offset + 0x800) & 0xfffff000;
376 lo12 = offset - hi20;
377 v = lo12;
378
379 break;
380 }
381 }
382 if (j == sechdrs[relsec].sh_size / sizeof(*rel)) {
383 pr_err(
384 "%s: Can not find HI20 relocation information\n",
385 me->name);
386 return -EINVAL;
387 }
388 }
389
390 res = handler(me, location, v);
391 if (res)
392 return res;
393 }
394
395 return 0;
396 }
Linux with added FPC-III support