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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Copyright (C) 2017 Zihao Yu
5 */
6
7#include <linux/elf.h>
8#include <linux/err.h>
9#include <linux/errno.h>
10#include <linux/moduleloader.h>
11#include <linux/vmalloc.h>
12#include <linux/sizes.h>
13#include <linux/pgtable.h>
14#include <asm/sections.h>
15
16static int apply_r_riscv_32_rela(struct module *me, u32 *location, Elf_Addr v)
17{
18 if (v != (u32)v) {
19 pr_err("%s: value %016llx out of range for 32-bit field\n",
20 me->name, (long long)v);
21 return -EINVAL;
22 }
23 *location = v;
24 return 0;
25}
26
27static int apply_r_riscv_64_rela(struct module *me, u32 *location, Elf_Addr v)
28{
29 *(u64 *)location = v;
30 return 0;
31}
32
33static int apply_r_riscv_branch_rela(struct module *me, u32 *location,
34 Elf_Addr v)
35{
36 ptrdiff_t offset = (void *)v - (void *)location;
37 u32 imm12 = (offset & 0x1000) << (31 - 12);
38 u32 imm11 = (offset & 0x800) >> (11 - 7);
39 u32 imm10_5 = (offset & 0x7e0) << (30 - 10);
40 u32 imm4_1 = (offset & 0x1e) << (11 - 4);
41
42 *location = (*location & 0x1fff07f) | imm12 | imm11 | imm10_5 | imm4_1;
43 return 0;
44}
45
46static int apply_r_riscv_jal_rela(struct module *me, u32 *location,
47 Elf_Addr v)
48{
49 ptrdiff_t offset = (void *)v - (void *)location;
50 u32 imm20 = (offset & 0x100000) << (31 - 20);
51 u32 imm19_12 = (offset & 0xff000);
52 u32 imm11 = (offset & 0x800) << (20 - 11);
53 u32 imm10_1 = (offset & 0x7fe) << (30 - 10);
54
55 *location = (*location & 0xfff) | imm20 | imm19_12 | imm11 | imm10_1;
56 return 0;
57}
58
59static int apply_r_riscv_rcv_branch_rela(struct module *me, u32 *location,
60 Elf_Addr v)
61{
62 ptrdiff_t offset = (void *)v - (void *)location;
63 u16 imm8 = (offset & 0x100) << (12 - 8);
64 u16 imm7_6 = (offset & 0xc0) >> (6 - 5);
65 u16 imm5 = (offset & 0x20) >> (5 - 2);
66 u16 imm4_3 = (offset & 0x18) << (12 - 5);
67 u16 imm2_1 = (offset & 0x6) << (12 - 10);
68
69 *(u16 *)location = (*(u16 *)location & 0xe383) |
70 imm8 | imm7_6 | imm5 | imm4_3 | imm2_1;
71 return 0;
72}
73
74static int apply_r_riscv_rvc_jump_rela(struct module *me, u32 *location,
75 Elf_Addr v)
76{
77 ptrdiff_t offset = (void *)v - (void *)location;
78 u16 imm11 = (offset & 0x800) << (12 - 11);
79 u16 imm10 = (offset & 0x400) >> (10 - 8);
80 u16 imm9_8 = (offset & 0x300) << (12 - 11);
81 u16 imm7 = (offset & 0x80) >> (7 - 6);
82 u16 imm6 = (offset & 0x40) << (12 - 11);
83 u16 imm5 = (offset & 0x20) >> (5 - 2);
84 u16 imm4 = (offset & 0x10) << (12 - 5);
85 u16 imm3_1 = (offset & 0xe) << (12 - 10);
86
87 *(u16 *)location = (*(u16 *)location & 0xe003) |
88 imm11 | imm10 | imm9_8 | imm7 | imm6 | imm5 | imm4 | imm3_1;
89 return 0;
90}
91
92static int apply_r_riscv_pcrel_hi20_rela(struct module *me, u32 *location,
93 Elf_Addr v)
94{
95 ptrdiff_t offset = (void *)v - (void *)location;
96 s32 hi20;
97
98 if (offset != (s32)offset) {
99 pr_err(
100 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
101 me->name, (long long)v, location);
102 return -EINVAL;
103 }
104
105 hi20 = (offset + 0x800) & 0xfffff000;
106 *location = (*location & 0xfff) | hi20;
107 return 0;
108}
109
110static int apply_r_riscv_pcrel_lo12_i_rela(struct module *me, u32 *location,
111 Elf_Addr v)
112{
113 /*
114 * v is the lo12 value to fill. It is calculated before calling this
115 * handler.
116 */
117 *location = (*location & 0xfffff) | ((v & 0xfff) << 20);
118 return 0;
119}
120
121static int apply_r_riscv_pcrel_lo12_s_rela(struct module *me, u32 *location,
122 Elf_Addr v)
123{
124 /*
125 * v is the lo12 value to fill. It is calculated before calling this
126 * handler.
127 */
128 u32 imm11_5 = (v & 0xfe0) << (31 - 11);
129 u32 imm4_0 = (v & 0x1f) << (11 - 4);
130
131 *location = (*location & 0x1fff07f) | imm11_5 | imm4_0;
132 return 0;
133}
134
135static int apply_r_riscv_hi20_rela(struct module *me, u32 *location,
136 Elf_Addr v)
137{
138 s32 hi20;
139
140 if (IS_ENABLED(CONFIG_CMODEL_MEDLOW)) {
141 pr_err(
142 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
143 me->name, (long long)v, location);
144 return -EINVAL;
145 }
146
147 hi20 = ((s32)v + 0x800) & 0xfffff000;
148 *location = (*location & 0xfff) | hi20;
149 return 0;
150}
151
152static int apply_r_riscv_lo12_i_rela(struct module *me, u32 *location,
153 Elf_Addr v)
154{
155 /* Skip medlow checking because of filtering by HI20 already */
156 s32 hi20 = ((s32)v + 0x800) & 0xfffff000;
157 s32 lo12 = ((s32)v - hi20);
158 *location = (*location & 0xfffff) | ((lo12 & 0xfff) << 20);
159 return 0;
160}
161
162static int apply_r_riscv_lo12_s_rela(struct module *me, u32 *location,
163 Elf_Addr v)
164{
165 /* Skip medlow checking because of filtering by HI20 already */
166 s32 hi20 = ((s32)v + 0x800) & 0xfffff000;
167 s32 lo12 = ((s32)v - hi20);
168 u32 imm11_5 = (lo12 & 0xfe0) << (31 - 11);
169 u32 imm4_0 = (lo12 & 0x1f) << (11 - 4);
170 *location = (*location & 0x1fff07f) | imm11_5 | imm4_0;
171 return 0;
172}
173
174static int apply_r_riscv_got_hi20_rela(struct module *me, u32 *location,
175 Elf_Addr v)
176{
177 ptrdiff_t offset = (void *)v - (void *)location;
178 s32 hi20;
179
180 /* Always emit the got entry */
181 if (IS_ENABLED(CONFIG_MODULE_SECTIONS)) {
182 offset = module_emit_got_entry(me, v);
183 offset = (void *)offset - (void *)location;
184 } else {
185 pr_err(
186 "%s: can not generate the GOT entry for symbol = %016llx from PC = %p\n",
187 me->name, (long long)v, location);
188 return -EINVAL;
189 }
190
191 hi20 = (offset + 0x800) & 0xfffff000;
192 *location = (*location & 0xfff) | hi20;
193 return 0;
194}
195
196static int apply_r_riscv_call_plt_rela(struct module *me, u32 *location,
197 Elf_Addr v)
198{
199 ptrdiff_t offset = (void *)v - (void *)location;
200 s32 fill_v = offset;
201 u32 hi20, lo12;
202
203 if (offset != fill_v) {
204 /* Only emit the plt entry if offset over 32-bit range */
205 if (IS_ENABLED(CONFIG_MODULE_SECTIONS)) {
206 offset = module_emit_plt_entry(me, v);
207 offset = (void *)offset - (void *)location;
208 } else {
209 pr_err(
210 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
211 me->name, (long long)v, location);
212 return -EINVAL;
213 }
214 }
215
216 hi20 = (offset + 0x800) & 0xfffff000;
217 lo12 = (offset - hi20) & 0xfff;
218 *location = (*location & 0xfff) | hi20;
219 *(location + 1) = (*(location + 1) & 0xfffff) | (lo12 << 20);
220 return 0;
221}
222
223static int apply_r_riscv_call_rela(struct module *me, u32 *location,
224 Elf_Addr v)
225{
226 ptrdiff_t offset = (void *)v - (void *)location;
227 s32 fill_v = offset;
228 u32 hi20, lo12;
229
230 if (offset != fill_v) {
231 pr_err(
232 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
233 me->name, (long long)v, location);
234 return -EINVAL;
235 }
236
237 hi20 = (offset + 0x800) & 0xfffff000;
238 lo12 = (offset - hi20) & 0xfff;
239 *location = (*location & 0xfff) | hi20;
240 *(location + 1) = (*(location + 1) & 0xfffff) | (lo12 << 20);
241 return 0;
242}
243
244static int apply_r_riscv_relax_rela(struct module *me, u32 *location,
245 Elf_Addr v)
246{
247 return 0;
248}
249
250static int apply_r_riscv_align_rela(struct module *me, u32 *location,
251 Elf_Addr v)
252{
253 pr_err(
254 "%s: The unexpected relocation type 'R_RISCV_ALIGN' from PC = %p\n",
255 me->name, location);
256 return -EINVAL;
257}
258
259static int apply_r_riscv_add32_rela(struct module *me, u32 *location,
260 Elf_Addr v)
261{
262 *(u32 *)location += (u32)v;
263 return 0;
264}
265
266static int apply_r_riscv_add64_rela(struct module *me, u32 *location,
267 Elf_Addr v)
268{
269 *(u64 *)location += (u64)v;
270 return 0;
271}
272
273static int apply_r_riscv_sub32_rela(struct module *me, u32 *location,
274 Elf_Addr v)
275{
276 *(u32 *)location -= (u32)v;
277 return 0;
278}
279
280static int apply_r_riscv_sub64_rela(struct module *me, u32 *location,
281 Elf_Addr v)
282{
283 *(u64 *)location -= (u64)v;
284 return 0;
285}
286
287static int (*reloc_handlers_rela[]) (struct module *me, u32 *location,
288 Elf_Addr v) = {
289 [R_RISCV_32] = apply_r_riscv_32_rela,
290 [R_RISCV_64] = apply_r_riscv_64_rela,
291 [R_RISCV_BRANCH] = apply_r_riscv_branch_rela,
292 [R_RISCV_JAL] = apply_r_riscv_jal_rela,
293 [R_RISCV_RVC_BRANCH] = apply_r_riscv_rcv_branch_rela,
294 [R_RISCV_RVC_JUMP] = apply_r_riscv_rvc_jump_rela,
295 [R_RISCV_PCREL_HI20] = apply_r_riscv_pcrel_hi20_rela,
296 [R_RISCV_PCREL_LO12_I] = apply_r_riscv_pcrel_lo12_i_rela,
297 [R_RISCV_PCREL_LO12_S] = apply_r_riscv_pcrel_lo12_s_rela,
298 [R_RISCV_HI20] = apply_r_riscv_hi20_rela,
299 [R_RISCV_LO12_I] = apply_r_riscv_lo12_i_rela,
300 [R_RISCV_LO12_S] = apply_r_riscv_lo12_s_rela,
301 [R_RISCV_GOT_HI20] = apply_r_riscv_got_hi20_rela,
302 [R_RISCV_CALL_PLT] = apply_r_riscv_call_plt_rela,
303 [R_RISCV_CALL] = apply_r_riscv_call_rela,
304 [R_RISCV_RELAX] = apply_r_riscv_relax_rela,
305 [R_RISCV_ALIGN] = apply_r_riscv_align_rela,
306 [R_RISCV_ADD32] = apply_r_riscv_add32_rela,
307 [R_RISCV_ADD64] = apply_r_riscv_add64_rela,
308 [R_RISCV_SUB32] = apply_r_riscv_sub32_rela,
309 [R_RISCV_SUB64] = apply_r_riscv_sub64_rela,
310};
311
312int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
313 unsigned int symindex, unsigned int relsec,
314 struct module *me)
315{
316 Elf_Rela *rel = (void *) sechdrs[relsec].sh_addr;
317 int (*handler)(struct module *me, u32 *location, Elf_Addr v);
318 Elf_Sym *sym;
319 u32 *location;
320 unsigned int i, type;
321 Elf_Addr v;
322 int res;
323
324 pr_debug("Applying relocate section %u to %u\n", relsec,
325 sechdrs[relsec].sh_info);
326
327 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
328 /* This is where to make the change */
329 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
330 + rel[i].r_offset;
331 /* This is the symbol it is referring to */
332 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
333 + ELF_RISCV_R_SYM(rel[i].r_info);
334 if (IS_ERR_VALUE(sym->st_value)) {
335 /* Ignore unresolved weak symbol */
336 if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
337 continue;
338 pr_warn("%s: Unknown symbol %s\n",
339 me->name, strtab + sym->st_name);
340 return -ENOENT;
341 }
342
343 type = ELF_RISCV_R_TYPE(rel[i].r_info);
344
345 if (type < ARRAY_SIZE(reloc_handlers_rela))
346 handler = reloc_handlers_rela[type];
347 else
348 handler = NULL;
349
350 if (!handler) {
351 pr_err("%s: Unknown relocation type %u\n",
352 me->name, type);
353 return -EINVAL;
354 }
355
356 v = sym->st_value + rel[i].r_addend;
357
358 if (type == R_RISCV_PCREL_LO12_I || type == R_RISCV_PCREL_LO12_S) {
359 unsigned int j;
360
361 for (j = 0; j < sechdrs[relsec].sh_size / sizeof(*rel); j++) {
362 unsigned long hi20_loc =
363 sechdrs[sechdrs[relsec].sh_info].sh_addr
364 + rel[j].r_offset;
365 u32 hi20_type = ELF_RISCV_R_TYPE(rel[j].r_info);
366
367 /* Find the corresponding HI20 relocation entry */
368 if (hi20_loc == sym->st_value
369 && (hi20_type == R_RISCV_PCREL_HI20
370 || hi20_type == R_RISCV_GOT_HI20)) {
371 s32 hi20, lo12;
372 Elf_Sym *hi20_sym =
373 (Elf_Sym *)sechdrs[symindex].sh_addr
374 + ELF_RISCV_R_SYM(rel[j].r_info);
375 unsigned long hi20_sym_val =
376 hi20_sym->st_value
377 + rel[j].r_addend;
378
379 /* Calculate lo12 */
380 size_t offset = hi20_sym_val - hi20_loc;
381 if (IS_ENABLED(CONFIG_MODULE_SECTIONS)
382 && hi20_type == R_RISCV_GOT_HI20) {
383 offset = module_emit_got_entry(
384 me, hi20_sym_val);
385 offset = offset - hi20_loc;
386 }
387 hi20 = (offset + 0x800) & 0xfffff000;
388 lo12 = offset - hi20;
389 v = lo12;
390
391 break;
392 }
393 }
394 if (j == sechdrs[relsec].sh_size / sizeof(*rel)) {
395 pr_err(
396 "%s: Can not find HI20 relocation information\n",
397 me->name);
398 return -EINVAL;
399 }
400 }
401
402 res = handler(me, location, v);
403 if (res)
404 return res;
405 }
406
407 return 0;
408}
409
410#if defined(CONFIG_MMU) && defined(CONFIG_64BIT)
411#define VMALLOC_MODULE_START \
412 max(PFN_ALIGN((unsigned long)&_end - SZ_2G), VMALLOC_START)
413void *module_alloc(unsigned long size)
414{
415 return __vmalloc_node_range(size, 1, VMALLOC_MODULE_START,
416 VMALLOC_END, GFP_KERNEL,
417 PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
418 __builtin_return_address(0));
419}
420#endif
1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 *
4 * Copyright (C) 2017 Zihao Yu
5 */
6
7#include <linux/elf.h>
8#include <linux/err.h>
9#include <linux/errno.h>
10#include <linux/hashtable.h>
11#include <linux/kernel.h>
12#include <linux/log2.h>
13#include <linux/moduleloader.h>
14#include <linux/vmalloc.h>
15#include <linux/sizes.h>
16#include <linux/pgtable.h>
17#include <asm/alternative.h>
18#include <asm/sections.h>
19
20struct used_bucket {
21 struct list_head head;
22 struct hlist_head *bucket;
23};
24
25struct relocation_head {
26 struct hlist_node node;
27 struct list_head *rel_entry;
28 void *location;
29};
30
31struct relocation_entry {
32 struct list_head head;
33 Elf_Addr value;
34 unsigned int type;
35};
36
37struct relocation_handlers {
38 int (*reloc_handler)(struct module *me, void *location, Elf_Addr v);
39 int (*accumulate_handler)(struct module *me, void *location,
40 long buffer);
41};
42
43/*
44 * The auipc+jalr instruction pair can reach any PC-relative offset
45 * in the range [-2^31 - 2^11, 2^31 - 2^11)
46 */
47static bool riscv_insn_valid_32bit_offset(ptrdiff_t val)
48{
49#ifdef CONFIG_32BIT
50 return true;
51#else
52 return (-(1L << 31) - (1L << 11)) <= val && val < ((1L << 31) - (1L << 11));
53#endif
54}
55
56static int riscv_insn_rmw(void *location, u32 keep, u32 set)
57{
58 __le16 *parcel = location;
59 u32 insn = (u32)le16_to_cpu(parcel[0]) | (u32)le16_to_cpu(parcel[1]) << 16;
60
61 insn &= keep;
62 insn |= set;
63
64 parcel[0] = cpu_to_le16(insn);
65 parcel[1] = cpu_to_le16(insn >> 16);
66 return 0;
67}
68
69static int riscv_insn_rvc_rmw(void *location, u16 keep, u16 set)
70{
71 __le16 *parcel = location;
72 u16 insn = le16_to_cpu(*parcel);
73
74 insn &= keep;
75 insn |= set;
76
77 *parcel = cpu_to_le16(insn);
78 return 0;
79}
80
81static int apply_r_riscv_32_rela(struct module *me, void *location, Elf_Addr v)
82{
83 if (v != (u32)v) {
84 pr_err("%s: value %016llx out of range for 32-bit field\n",
85 me->name, (long long)v);
86 return -EINVAL;
87 }
88 *(u32 *)location = v;
89 return 0;
90}
91
92static int apply_r_riscv_64_rela(struct module *me, void *location, Elf_Addr v)
93{
94 *(u64 *)location = v;
95 return 0;
96}
97
98static int apply_r_riscv_branch_rela(struct module *me, void *location,
99 Elf_Addr v)
100{
101 ptrdiff_t offset = (void *)v - location;
102 u32 imm12 = (offset & 0x1000) << (31 - 12);
103 u32 imm11 = (offset & 0x800) >> (11 - 7);
104 u32 imm10_5 = (offset & 0x7e0) << (30 - 10);
105 u32 imm4_1 = (offset & 0x1e) << (11 - 4);
106
107 return riscv_insn_rmw(location, 0x1fff07f, imm12 | imm11 | imm10_5 | imm4_1);
108}
109
110static int apply_r_riscv_jal_rela(struct module *me, void *location,
111 Elf_Addr v)
112{
113 ptrdiff_t offset = (void *)v - location;
114 u32 imm20 = (offset & 0x100000) << (31 - 20);
115 u32 imm19_12 = (offset & 0xff000);
116 u32 imm11 = (offset & 0x800) << (20 - 11);
117 u32 imm10_1 = (offset & 0x7fe) << (30 - 10);
118
119 return riscv_insn_rmw(location, 0xfff, imm20 | imm19_12 | imm11 | imm10_1);
120}
121
122static int apply_r_riscv_rvc_branch_rela(struct module *me, void *location,
123 Elf_Addr v)
124{
125 ptrdiff_t offset = (void *)v - location;
126 u16 imm8 = (offset & 0x100) << (12 - 8);
127 u16 imm7_6 = (offset & 0xc0) >> (6 - 5);
128 u16 imm5 = (offset & 0x20) >> (5 - 2);
129 u16 imm4_3 = (offset & 0x18) << (12 - 5);
130 u16 imm2_1 = (offset & 0x6) << (12 - 10);
131
132 return riscv_insn_rvc_rmw(location, 0xe383,
133 imm8 | imm7_6 | imm5 | imm4_3 | imm2_1);
134}
135
136static int apply_r_riscv_rvc_jump_rela(struct module *me, void *location,
137 Elf_Addr v)
138{
139 ptrdiff_t offset = (void *)v - location;
140 u16 imm11 = (offset & 0x800) << (12 - 11);
141 u16 imm10 = (offset & 0x400) >> (10 - 8);
142 u16 imm9_8 = (offset & 0x300) << (12 - 11);
143 u16 imm7 = (offset & 0x80) >> (7 - 6);
144 u16 imm6 = (offset & 0x40) << (12 - 11);
145 u16 imm5 = (offset & 0x20) >> (5 - 2);
146 u16 imm4 = (offset & 0x10) << (12 - 5);
147 u16 imm3_1 = (offset & 0xe) << (12 - 10);
148
149 return riscv_insn_rvc_rmw(location, 0xe003,
150 imm11 | imm10 | imm9_8 | imm7 | imm6 | imm5 | imm4 | imm3_1);
151}
152
153static int apply_r_riscv_pcrel_hi20_rela(struct module *me, void *location,
154 Elf_Addr v)
155{
156 ptrdiff_t offset = (void *)v - location;
157
158 if (!riscv_insn_valid_32bit_offset(offset)) {
159 pr_err(
160 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
161 me->name, (long long)v, location);
162 return -EINVAL;
163 }
164
165 return riscv_insn_rmw(location, 0xfff, (offset + 0x800) & 0xfffff000);
166}
167
168static int apply_r_riscv_pcrel_lo12_i_rela(struct module *me, void *location,
169 Elf_Addr v)
170{
171 /*
172 * v is the lo12 value to fill. It is calculated before calling this
173 * handler.
174 */
175 return riscv_insn_rmw(location, 0xfffff, (v & 0xfff) << 20);
176}
177
178static int apply_r_riscv_pcrel_lo12_s_rela(struct module *me, void *location,
179 Elf_Addr v)
180{
181 /*
182 * v is the lo12 value to fill. It is calculated before calling this
183 * handler.
184 */
185 u32 imm11_5 = (v & 0xfe0) << (31 - 11);
186 u32 imm4_0 = (v & 0x1f) << (11 - 4);
187
188 return riscv_insn_rmw(location, 0x1fff07f, imm11_5 | imm4_0);
189}
190
191static int apply_r_riscv_hi20_rela(struct module *me, void *location,
192 Elf_Addr v)
193{
194 if (IS_ENABLED(CONFIG_CMODEL_MEDLOW)) {
195 pr_err(
196 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
197 me->name, (long long)v, location);
198 return -EINVAL;
199 }
200
201 return riscv_insn_rmw(location, 0xfff, ((s32)v + 0x800) & 0xfffff000);
202}
203
204static int apply_r_riscv_lo12_i_rela(struct module *me, void *location,
205 Elf_Addr v)
206{
207 /* Skip medlow checking because of filtering by HI20 already */
208 s32 hi20 = ((s32)v + 0x800) & 0xfffff000;
209 s32 lo12 = ((s32)v - hi20);
210
211 return riscv_insn_rmw(location, 0xfffff, (lo12 & 0xfff) << 20);
212}
213
214static int apply_r_riscv_lo12_s_rela(struct module *me, void *location,
215 Elf_Addr v)
216{
217 /* Skip medlow checking because of filtering by HI20 already */
218 s32 hi20 = ((s32)v + 0x800) & 0xfffff000;
219 s32 lo12 = ((s32)v - hi20);
220 u32 imm11_5 = (lo12 & 0xfe0) << (31 - 11);
221 u32 imm4_0 = (lo12 & 0x1f) << (11 - 4);
222
223 return riscv_insn_rmw(location, 0x1fff07f, imm11_5 | imm4_0);
224}
225
226static int apply_r_riscv_got_hi20_rela(struct module *me, void *location,
227 Elf_Addr v)
228{
229 ptrdiff_t offset = (void *)v - location;
230
231 /* Always emit the got entry */
232 if (IS_ENABLED(CONFIG_MODULE_SECTIONS)) {
233 offset = (void *)module_emit_got_entry(me, v) - location;
234 } else {
235 pr_err(
236 "%s: can not generate the GOT entry for symbol = %016llx from PC = %p\n",
237 me->name, (long long)v, location);
238 return -EINVAL;
239 }
240
241 return riscv_insn_rmw(location, 0xfff, (offset + 0x800) & 0xfffff000);
242}
243
244static int apply_r_riscv_call_plt_rela(struct module *me, void *location,
245 Elf_Addr v)
246{
247 ptrdiff_t offset = (void *)v - location;
248 u32 hi20, lo12;
249
250 if (!riscv_insn_valid_32bit_offset(offset)) {
251 /* Only emit the plt entry if offset over 32-bit range */
252 if (IS_ENABLED(CONFIG_MODULE_SECTIONS)) {
253 offset = (void *)module_emit_plt_entry(me, v) - location;
254 } else {
255 pr_err(
256 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
257 me->name, (long long)v, location);
258 return -EINVAL;
259 }
260 }
261
262 hi20 = (offset + 0x800) & 0xfffff000;
263 lo12 = (offset - hi20) & 0xfff;
264 riscv_insn_rmw(location, 0xfff, hi20);
265 return riscv_insn_rmw(location + 4, 0xfffff, lo12 << 20);
266}
267
268static int apply_r_riscv_call_rela(struct module *me, void *location,
269 Elf_Addr v)
270{
271 ptrdiff_t offset = (void *)v - location;
272 u32 hi20, lo12;
273
274 if (!riscv_insn_valid_32bit_offset(offset)) {
275 pr_err(
276 "%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
277 me->name, (long long)v, location);
278 return -EINVAL;
279 }
280
281 hi20 = (offset + 0x800) & 0xfffff000;
282 lo12 = (offset - hi20) & 0xfff;
283 riscv_insn_rmw(location, 0xfff, hi20);
284 return riscv_insn_rmw(location + 4, 0xfffff, lo12 << 20);
285}
286
287static int apply_r_riscv_relax_rela(struct module *me, void *location,
288 Elf_Addr v)
289{
290 return 0;
291}
292
293static int apply_r_riscv_align_rela(struct module *me, void *location,
294 Elf_Addr v)
295{
296 pr_err(
297 "%s: The unexpected relocation type 'R_RISCV_ALIGN' from PC = %p\n",
298 me->name, location);
299 return -EINVAL;
300}
301
302static int apply_r_riscv_add8_rela(struct module *me, void *location, Elf_Addr v)
303{
304 *(u8 *)location += (u8)v;
305 return 0;
306}
307
308static int apply_r_riscv_add16_rela(struct module *me, void *location,
309 Elf_Addr v)
310{
311 *(u16 *)location += (u16)v;
312 return 0;
313}
314
315static int apply_r_riscv_add32_rela(struct module *me, void *location,
316 Elf_Addr v)
317{
318 *(u32 *)location += (u32)v;
319 return 0;
320}
321
322static int apply_r_riscv_add64_rela(struct module *me, void *location,
323 Elf_Addr v)
324{
325 *(u64 *)location += (u64)v;
326 return 0;
327}
328
329static int apply_r_riscv_sub8_rela(struct module *me, void *location, Elf_Addr v)
330{
331 *(u8 *)location -= (u8)v;
332 return 0;
333}
334
335static int apply_r_riscv_sub16_rela(struct module *me, void *location,
336 Elf_Addr v)
337{
338 *(u16 *)location -= (u16)v;
339 return 0;
340}
341
342static int apply_r_riscv_sub32_rela(struct module *me, void *location,
343 Elf_Addr v)
344{
345 *(u32 *)location -= (u32)v;
346 return 0;
347}
348
349static int apply_r_riscv_sub64_rela(struct module *me, void *location,
350 Elf_Addr v)
351{
352 *(u64 *)location -= (u64)v;
353 return 0;
354}
355
356static int dynamic_linking_not_supported(struct module *me, void *location,
357 Elf_Addr v)
358{
359 pr_err("%s: Dynamic linking not supported in kernel modules PC = %p\n",
360 me->name, location);
361 return -EINVAL;
362}
363
364static int tls_not_supported(struct module *me, void *location, Elf_Addr v)
365{
366 pr_err("%s: Thread local storage not supported in kernel modules PC = %p\n",
367 me->name, location);
368 return -EINVAL;
369}
370
371static int apply_r_riscv_sub6_rela(struct module *me, void *location, Elf_Addr v)
372{
373 u8 *byte = location;
374 u8 value = v;
375
376 *byte = (*byte - (value & 0x3f)) & 0x3f;
377 return 0;
378}
379
380static int apply_r_riscv_set6_rela(struct module *me, void *location, Elf_Addr v)
381{
382 u8 *byte = location;
383 u8 value = v;
384
385 *byte = (*byte & 0xc0) | (value & 0x3f);
386 return 0;
387}
388
389static int apply_r_riscv_set8_rela(struct module *me, void *location, Elf_Addr v)
390{
391 *(u8 *)location = (u8)v;
392 return 0;
393}
394
395static int apply_r_riscv_set16_rela(struct module *me, void *location,
396 Elf_Addr v)
397{
398 *(u16 *)location = (u16)v;
399 return 0;
400}
401
402static int apply_r_riscv_set32_rela(struct module *me, void *location,
403 Elf_Addr v)
404{
405 *(u32 *)location = (u32)v;
406 return 0;
407}
408
409static int apply_r_riscv_32_pcrel_rela(struct module *me, void *location,
410 Elf_Addr v)
411{
412 *(u32 *)location = v - (uintptr_t)location;
413 return 0;
414}
415
416static int apply_r_riscv_plt32_rela(struct module *me, void *location,
417 Elf_Addr v)
418{
419 ptrdiff_t offset = (void *)v - location;
420
421 if (!riscv_insn_valid_32bit_offset(offset)) {
422 /* Only emit the plt entry if offset over 32-bit range */
423 if (IS_ENABLED(CONFIG_MODULE_SECTIONS)) {
424 offset = (void *)module_emit_plt_entry(me, v) - location;
425 } else {
426 pr_err("%s: target %016llx can not be addressed by the 32-bit offset from PC = %p\n",
427 me->name, (long long)v, location);
428 return -EINVAL;
429 }
430 }
431
432 *(u32 *)location = (u32)offset;
433 return 0;
434}
435
436static int apply_r_riscv_set_uleb128(struct module *me, void *location, Elf_Addr v)
437{
438 *(long *)location = v;
439 return 0;
440}
441
442static int apply_r_riscv_sub_uleb128(struct module *me, void *location, Elf_Addr v)
443{
444 *(long *)location -= v;
445 return 0;
446}
447
448static int apply_6_bit_accumulation(struct module *me, void *location, long buffer)
449{
450 u8 *byte = location;
451 u8 value = buffer;
452
453 if (buffer > 0x3f) {
454 pr_err("%s: value %ld out of range for 6-bit relocation.\n",
455 me->name, buffer);
456 return -EINVAL;
457 }
458
459 *byte = (*byte & 0xc0) | (value & 0x3f);
460 return 0;
461}
462
463static int apply_8_bit_accumulation(struct module *me, void *location, long buffer)
464{
465 if (buffer > U8_MAX) {
466 pr_err("%s: value %ld out of range for 8-bit relocation.\n",
467 me->name, buffer);
468 return -EINVAL;
469 }
470 *(u8 *)location = (u8)buffer;
471 return 0;
472}
473
474static int apply_16_bit_accumulation(struct module *me, void *location, long buffer)
475{
476 if (buffer > U16_MAX) {
477 pr_err("%s: value %ld out of range for 16-bit relocation.\n",
478 me->name, buffer);
479 return -EINVAL;
480 }
481 *(u16 *)location = (u16)buffer;
482 return 0;
483}
484
485static int apply_32_bit_accumulation(struct module *me, void *location, long buffer)
486{
487 if (buffer > U32_MAX) {
488 pr_err("%s: value %ld out of range for 32-bit relocation.\n",
489 me->name, buffer);
490 return -EINVAL;
491 }
492 *(u32 *)location = (u32)buffer;
493 return 0;
494}
495
496static int apply_64_bit_accumulation(struct module *me, void *location, long buffer)
497{
498 *(u64 *)location = (u64)buffer;
499 return 0;
500}
501
502static int apply_uleb128_accumulation(struct module *me, void *location, long buffer)
503{
504 /*
505 * ULEB128 is a variable length encoding. Encode the buffer into
506 * the ULEB128 data format.
507 */
508 u8 *p = location;
509
510 while (buffer != 0) {
511 u8 value = buffer & 0x7f;
512
513 buffer >>= 7;
514 value |= (!!buffer) << 7;
515
516 *p++ = value;
517 }
518 return 0;
519}
520
521/*
522 * Relocations defined in the riscv-elf-psabi-doc.
523 * This handles static linking only.
524 */
525static const struct relocation_handlers reloc_handlers[] = {
526 [R_RISCV_32] = { .reloc_handler = apply_r_riscv_32_rela },
527 [R_RISCV_64] = { .reloc_handler = apply_r_riscv_64_rela },
528 [R_RISCV_RELATIVE] = { .reloc_handler = dynamic_linking_not_supported },
529 [R_RISCV_COPY] = { .reloc_handler = dynamic_linking_not_supported },
530 [R_RISCV_JUMP_SLOT] = { .reloc_handler = dynamic_linking_not_supported },
531 [R_RISCV_TLS_DTPMOD32] = { .reloc_handler = dynamic_linking_not_supported },
532 [R_RISCV_TLS_DTPMOD64] = { .reloc_handler = dynamic_linking_not_supported },
533 [R_RISCV_TLS_DTPREL32] = { .reloc_handler = dynamic_linking_not_supported },
534 [R_RISCV_TLS_DTPREL64] = { .reloc_handler = dynamic_linking_not_supported },
535 [R_RISCV_TLS_TPREL32] = { .reloc_handler = dynamic_linking_not_supported },
536 [R_RISCV_TLS_TPREL64] = { .reloc_handler = dynamic_linking_not_supported },
537 /* 12-15 undefined */
538 [R_RISCV_BRANCH] = { .reloc_handler = apply_r_riscv_branch_rela },
539 [R_RISCV_JAL] = { .reloc_handler = apply_r_riscv_jal_rela },
540 [R_RISCV_CALL] = { .reloc_handler = apply_r_riscv_call_rela },
541 [R_RISCV_CALL_PLT] = { .reloc_handler = apply_r_riscv_call_plt_rela },
542 [R_RISCV_GOT_HI20] = { .reloc_handler = apply_r_riscv_got_hi20_rela },
543 [R_RISCV_TLS_GOT_HI20] = { .reloc_handler = tls_not_supported },
544 [R_RISCV_TLS_GD_HI20] = { .reloc_handler = tls_not_supported },
545 [R_RISCV_PCREL_HI20] = { .reloc_handler = apply_r_riscv_pcrel_hi20_rela },
546 [R_RISCV_PCREL_LO12_I] = { .reloc_handler = apply_r_riscv_pcrel_lo12_i_rela },
547 [R_RISCV_PCREL_LO12_S] = { .reloc_handler = apply_r_riscv_pcrel_lo12_s_rela },
548 [R_RISCV_HI20] = { .reloc_handler = apply_r_riscv_hi20_rela },
549 [R_RISCV_LO12_I] = { .reloc_handler = apply_r_riscv_lo12_i_rela },
550 [R_RISCV_LO12_S] = { .reloc_handler = apply_r_riscv_lo12_s_rela },
551 [R_RISCV_TPREL_HI20] = { .reloc_handler = tls_not_supported },
552 [R_RISCV_TPREL_LO12_I] = { .reloc_handler = tls_not_supported },
553 [R_RISCV_TPREL_LO12_S] = { .reloc_handler = tls_not_supported },
554 [R_RISCV_TPREL_ADD] = { .reloc_handler = tls_not_supported },
555 [R_RISCV_ADD8] = { .reloc_handler = apply_r_riscv_add8_rela,
556 .accumulate_handler = apply_8_bit_accumulation },
557 [R_RISCV_ADD16] = { .reloc_handler = apply_r_riscv_add16_rela,
558 .accumulate_handler = apply_16_bit_accumulation },
559 [R_RISCV_ADD32] = { .reloc_handler = apply_r_riscv_add32_rela,
560 .accumulate_handler = apply_32_bit_accumulation },
561 [R_RISCV_ADD64] = { .reloc_handler = apply_r_riscv_add64_rela,
562 .accumulate_handler = apply_64_bit_accumulation },
563 [R_RISCV_SUB8] = { .reloc_handler = apply_r_riscv_sub8_rela,
564 .accumulate_handler = apply_8_bit_accumulation },
565 [R_RISCV_SUB16] = { .reloc_handler = apply_r_riscv_sub16_rela,
566 .accumulate_handler = apply_16_bit_accumulation },
567 [R_RISCV_SUB32] = { .reloc_handler = apply_r_riscv_sub32_rela,
568 .accumulate_handler = apply_32_bit_accumulation },
569 [R_RISCV_SUB64] = { .reloc_handler = apply_r_riscv_sub64_rela,
570 .accumulate_handler = apply_64_bit_accumulation },
571 /* 41-42 reserved for future standard use */
572 [R_RISCV_ALIGN] = { .reloc_handler = apply_r_riscv_align_rela },
573 [R_RISCV_RVC_BRANCH] = { .reloc_handler = apply_r_riscv_rvc_branch_rela },
574 [R_RISCV_RVC_JUMP] = { .reloc_handler = apply_r_riscv_rvc_jump_rela },
575 /* 46-50 reserved for future standard use */
576 [R_RISCV_RELAX] = { .reloc_handler = apply_r_riscv_relax_rela },
577 [R_RISCV_SUB6] = { .reloc_handler = apply_r_riscv_sub6_rela,
578 .accumulate_handler = apply_6_bit_accumulation },
579 [R_RISCV_SET6] = { .reloc_handler = apply_r_riscv_set6_rela,
580 .accumulate_handler = apply_6_bit_accumulation },
581 [R_RISCV_SET8] = { .reloc_handler = apply_r_riscv_set8_rela,
582 .accumulate_handler = apply_8_bit_accumulation },
583 [R_RISCV_SET16] = { .reloc_handler = apply_r_riscv_set16_rela,
584 .accumulate_handler = apply_16_bit_accumulation },
585 [R_RISCV_SET32] = { .reloc_handler = apply_r_riscv_set32_rela,
586 .accumulate_handler = apply_32_bit_accumulation },
587 [R_RISCV_32_PCREL] = { .reloc_handler = apply_r_riscv_32_pcrel_rela },
588 [R_RISCV_IRELATIVE] = { .reloc_handler = dynamic_linking_not_supported },
589 [R_RISCV_PLT32] = { .reloc_handler = apply_r_riscv_plt32_rela },
590 [R_RISCV_SET_ULEB128] = { .reloc_handler = apply_r_riscv_set_uleb128,
591 .accumulate_handler = apply_uleb128_accumulation },
592 [R_RISCV_SUB_ULEB128] = { .reloc_handler = apply_r_riscv_sub_uleb128,
593 .accumulate_handler = apply_uleb128_accumulation },
594 /* 62-191 reserved for future standard use */
595 /* 192-255 nonstandard ABI extensions */
596};
597
598static void
599process_accumulated_relocations(struct module *me,
600 struct hlist_head **relocation_hashtable,
601 struct list_head *used_buckets_list)
602{
603 /*
604 * Only ADD/SUB/SET/ULEB128 should end up here.
605 *
606 * Each bucket may have more than one relocation location. All
607 * relocations for a location are stored in a list in a bucket.
608 *
609 * Relocations are applied to a temp variable before being stored to the
610 * provided location to check for overflow. This also allows ULEB128 to
611 * properly decide how many entries are needed before storing to
612 * location. The final value is stored into location using the handler
613 * for the last relocation to an address.
614 *
615 * Three layers of indexing:
616 * - Each of the buckets in use
617 * - Groups of relocations in each bucket by location address
618 * - Each relocation entry for a location address
619 */
620 struct used_bucket *bucket_iter;
621 struct used_bucket *bucket_iter_tmp;
622 struct relocation_head *rel_head_iter;
623 struct hlist_node *rel_head_iter_tmp;
624 struct relocation_entry *rel_entry_iter;
625 struct relocation_entry *rel_entry_iter_tmp;
626 int curr_type;
627 void *location;
628 long buffer;
629
630 list_for_each_entry_safe(bucket_iter, bucket_iter_tmp,
631 used_buckets_list, head) {
632 hlist_for_each_entry_safe(rel_head_iter, rel_head_iter_tmp,
633 bucket_iter->bucket, node) {
634 buffer = 0;
635 location = rel_head_iter->location;
636 list_for_each_entry_safe(rel_entry_iter,
637 rel_entry_iter_tmp,
638 rel_head_iter->rel_entry,
639 head) {
640 curr_type = rel_entry_iter->type;
641 reloc_handlers[curr_type].reloc_handler(
642 me, &buffer, rel_entry_iter->value);
643 kfree(rel_entry_iter);
644 }
645 reloc_handlers[curr_type].accumulate_handler(
646 me, location, buffer);
647 kfree(rel_head_iter);
648 }
649 kfree(bucket_iter);
650 }
651
652 kfree(*relocation_hashtable);
653}
654
655static int add_relocation_to_accumulate(struct module *me, int type,
656 void *location,
657 unsigned int hashtable_bits, Elf_Addr v,
658 struct hlist_head *relocation_hashtable,
659 struct list_head *used_buckets_list)
660{
661 struct relocation_entry *entry;
662 struct relocation_head *rel_head;
663 struct hlist_head *current_head;
664 struct used_bucket *bucket;
665 unsigned long hash;
666
667 entry = kmalloc(sizeof(*entry), GFP_KERNEL);
668
669 if (!entry)
670 return -ENOMEM;
671
672 INIT_LIST_HEAD(&entry->head);
673 entry->type = type;
674 entry->value = v;
675
676 hash = hash_min((uintptr_t)location, hashtable_bits);
677
678 current_head = &relocation_hashtable[hash];
679
680 /*
681 * Search for the relocation_head for the relocations that happen at the
682 * provided location
683 */
684 bool found = false;
685 struct relocation_head *rel_head_iter;
686
687 hlist_for_each_entry(rel_head_iter, current_head, node) {
688 if (rel_head_iter->location == location) {
689 found = true;
690 rel_head = rel_head_iter;
691 break;
692 }
693 }
694
695 /*
696 * If there has not yet been any relocations at the provided location,
697 * create a relocation_head for that location and populate it with this
698 * relocation_entry.
699 */
700 if (!found) {
701 rel_head = kmalloc(sizeof(*rel_head), GFP_KERNEL);
702
703 if (!rel_head) {
704 kfree(entry);
705 return -ENOMEM;
706 }
707
708 rel_head->rel_entry =
709 kmalloc(sizeof(struct list_head), GFP_KERNEL);
710
711 if (!rel_head->rel_entry) {
712 kfree(entry);
713 kfree(rel_head);
714 return -ENOMEM;
715 }
716
717 INIT_LIST_HEAD(rel_head->rel_entry);
718 rel_head->location = location;
719 INIT_HLIST_NODE(&rel_head->node);
720 if (!current_head->first) {
721 bucket =
722 kmalloc(sizeof(struct used_bucket), GFP_KERNEL);
723
724 if (!bucket) {
725 kfree(entry);
726 kfree(rel_head->rel_entry);
727 kfree(rel_head);
728 return -ENOMEM;
729 }
730
731 INIT_LIST_HEAD(&bucket->head);
732 bucket->bucket = current_head;
733 list_add(&bucket->head, used_buckets_list);
734 }
735 hlist_add_head(&rel_head->node, current_head);
736 }
737
738 /* Add relocation to head of discovered rel_head */
739 list_add_tail(&entry->head, rel_head->rel_entry);
740
741 return 0;
742}
743
744static unsigned int
745initialize_relocation_hashtable(unsigned int num_relocations,
746 struct hlist_head **relocation_hashtable)
747{
748 /* Can safely assume that bits is not greater than sizeof(long) */
749 unsigned long hashtable_size = roundup_pow_of_two(num_relocations);
750 /*
751 * When hashtable_size == 1, hashtable_bits == 0.
752 * This is valid because the hashing algorithm returns 0 in this case.
753 */
754 unsigned int hashtable_bits = ilog2(hashtable_size);
755
756 /*
757 * Double size of hashtable if num_relocations * 1.25 is greater than
758 * hashtable_size.
759 */
760 int should_double_size = ((num_relocations + (num_relocations >> 2)) > (hashtable_size));
761
762 hashtable_bits += should_double_size;
763
764 hashtable_size <<= should_double_size;
765
766 *relocation_hashtable = kmalloc_array(hashtable_size,
767 sizeof(**relocation_hashtable),
768 GFP_KERNEL);
769 if (!*relocation_hashtable)
770 return 0;
771
772 __hash_init(*relocation_hashtable, hashtable_size);
773
774 return hashtable_bits;
775}
776
777int apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
778 unsigned int symindex, unsigned int relsec,
779 struct module *me)
780{
781 Elf_Rela *rel = (void *) sechdrs[relsec].sh_addr;
782 int (*handler)(struct module *me, void *location, Elf_Addr v);
783 Elf_Sym *sym;
784 void *location;
785 unsigned int i, type;
786 unsigned int j_idx = 0;
787 Elf_Addr v;
788 int res;
789 unsigned int num_relocations = sechdrs[relsec].sh_size / sizeof(*rel);
790 struct hlist_head *relocation_hashtable;
791 struct list_head used_buckets_list;
792 unsigned int hashtable_bits;
793
794 hashtable_bits = initialize_relocation_hashtable(num_relocations,
795 &relocation_hashtable);
796
797 if (!relocation_hashtable)
798 return -ENOMEM;
799
800 INIT_LIST_HEAD(&used_buckets_list);
801
802 pr_debug("Applying relocate section %u to %u\n", relsec,
803 sechdrs[relsec].sh_info);
804
805 for (i = 0; i < num_relocations; i++) {
806 /* This is where to make the change */
807 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr
808 + rel[i].r_offset;
809 /* This is the symbol it is referring to */
810 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
811 + ELF_RISCV_R_SYM(rel[i].r_info);
812 if (IS_ERR_VALUE(sym->st_value)) {
813 /* Ignore unresolved weak symbol */
814 if (ELF_ST_BIND(sym->st_info) == STB_WEAK)
815 continue;
816 pr_warn("%s: Unknown symbol %s\n",
817 me->name, strtab + sym->st_name);
818 return -ENOENT;
819 }
820
821 type = ELF_RISCV_R_TYPE(rel[i].r_info);
822
823 if (type < ARRAY_SIZE(reloc_handlers))
824 handler = reloc_handlers[type].reloc_handler;
825 else
826 handler = NULL;
827
828 if (!handler) {
829 pr_err("%s: Unknown relocation type %u\n",
830 me->name, type);
831 return -EINVAL;
832 }
833
834 v = sym->st_value + rel[i].r_addend;
835
836 if (type == R_RISCV_PCREL_LO12_I || type == R_RISCV_PCREL_LO12_S) {
837 unsigned int j = j_idx;
838 bool found = false;
839
840 do {
841 unsigned long hi20_loc =
842 sechdrs[sechdrs[relsec].sh_info].sh_addr
843 + rel[j].r_offset;
844 u32 hi20_type = ELF_RISCV_R_TYPE(rel[j].r_info);
845
846 /* Find the corresponding HI20 relocation entry */
847 if (hi20_loc == sym->st_value
848 && (hi20_type == R_RISCV_PCREL_HI20
849 || hi20_type == R_RISCV_GOT_HI20)) {
850 s32 hi20, lo12;
851 Elf_Sym *hi20_sym =
852 (Elf_Sym *)sechdrs[symindex].sh_addr
853 + ELF_RISCV_R_SYM(rel[j].r_info);
854 unsigned long hi20_sym_val =
855 hi20_sym->st_value
856 + rel[j].r_addend;
857
858 /* Calculate lo12 */
859 size_t offset = hi20_sym_val - hi20_loc;
860 if (IS_ENABLED(CONFIG_MODULE_SECTIONS)
861 && hi20_type == R_RISCV_GOT_HI20) {
862 offset = module_emit_got_entry(
863 me, hi20_sym_val);
864 offset = offset - hi20_loc;
865 }
866 hi20 = (offset + 0x800) & 0xfffff000;
867 lo12 = offset - hi20;
868 v = lo12;
869 found = true;
870
871 break;
872 }
873
874 j++;
875 if (j > sechdrs[relsec].sh_size / sizeof(*rel))
876 j = 0;
877
878 } while (j_idx != j);
879
880 if (!found) {
881 pr_err(
882 "%s: Can not find HI20 relocation information\n",
883 me->name);
884 return -EINVAL;
885 }
886
887 /* Record the previous j-loop end index */
888 j_idx = j;
889 }
890
891 if (reloc_handlers[type].accumulate_handler)
892 res = add_relocation_to_accumulate(me, type, location,
893 hashtable_bits, v,
894 relocation_hashtable,
895 &used_buckets_list);
896 else
897 res = handler(me, location, v);
898 if (res)
899 return res;
900 }
901
902 process_accumulated_relocations(me, &relocation_hashtable,
903 &used_buckets_list);
904
905 return 0;
906}
907
908#if defined(CONFIG_MMU) && defined(CONFIG_64BIT)
909void *module_alloc(unsigned long size)
910{
911 return __vmalloc_node_range(size, 1, MODULES_VADDR,
912 MODULES_END, GFP_KERNEL,
913 PAGE_KERNEL, VM_FLUSH_RESET_PERMS,
914 NUMA_NO_NODE,
915 __builtin_return_address(0));
916}
917#endif
918
919int module_finalize(const Elf_Ehdr *hdr,
920 const Elf_Shdr *sechdrs,
921 struct module *me)
922{
923 const Elf_Shdr *s;
924
925 s = find_section(hdr, sechdrs, ".alternative");
926 if (s)
927 apply_module_alternatives((void *)s->sh_addr, s->sh_size);
928
929 return 0;
930}