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1/*
2 * linux/arch/arm/kernel/module.c
3 *
4 * Copyright (C) 2002 Russell King.
5 * Modified for nommu by Hyok S. Choi
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 * Module allocation method suggested by Andi Kleen.
12 */
13#include <linux/module.h>
14#include <linux/moduleloader.h>
15#include <linux/kernel.h>
16#include <linux/mm.h>
17#include <linux/elf.h>
18#include <linux/vmalloc.h>
19#include <linux/fs.h>
20#include <linux/string.h>
21#include <linux/gfp.h>
22
23#include <asm/pgtable.h>
24#include <asm/sections.h>
25#include <asm/smp_plat.h>
26#include <asm/unwind.h>
27#include <asm/opcodes.h>
28
29#ifdef CONFIG_XIP_KERNEL
30/*
31 * The XIP kernel text is mapped in the module area for modules and
32 * some other stuff to work without any indirect relocations.
33 * MODULES_VADDR is redefined here and not in asm/memory.h to avoid
34 * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
35 */
36#undef MODULES_VADDR
37#define MODULES_VADDR (((unsigned long)_exiprom + ~PMD_MASK) & PMD_MASK)
38#endif
39
40#ifdef CONFIG_MMU
41void *module_alloc(unsigned long size)
42{
43 void *p = __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
44 GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
45 __builtin_return_address(0));
46 if (!IS_ENABLED(CONFIG_ARM_MODULE_PLTS) || p)
47 return p;
48 return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
49 GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
50 __builtin_return_address(0));
51}
52#endif
53
54int
55apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
56 unsigned int relindex, struct module *module)
57{
58 Elf32_Shdr *symsec = sechdrs + symindex;
59 Elf32_Shdr *relsec = sechdrs + relindex;
60 Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
61 Elf32_Rel *rel = (void *)relsec->sh_addr;
62 unsigned int i;
63
64 for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
65 unsigned long loc;
66 Elf32_Sym *sym;
67 const char *symname;
68 s32 offset;
69 u32 tmp;
70#ifdef CONFIG_THUMB2_KERNEL
71 u32 upper, lower, sign, j1, j2;
72#endif
73
74 offset = ELF32_R_SYM(rel->r_info);
75 if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
76 pr_err("%s: section %u reloc %u: bad relocation sym offset\n",
77 module->name, relindex, i);
78 return -ENOEXEC;
79 }
80
81 sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
82 symname = strtab + sym->st_name;
83
84 if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) {
85 pr_err("%s: section %u reloc %u sym '%s': out of bounds relocation, offset %d size %u\n",
86 module->name, relindex, i, symname,
87 rel->r_offset, dstsec->sh_size);
88 return -ENOEXEC;
89 }
90
91 loc = dstsec->sh_addr + rel->r_offset;
92
93 switch (ELF32_R_TYPE(rel->r_info)) {
94 case R_ARM_NONE:
95 /* ignore */
96 break;
97
98 case R_ARM_ABS32:
99 case R_ARM_TARGET1:
100 *(u32 *)loc += sym->st_value;
101 break;
102
103 case R_ARM_PC24:
104 case R_ARM_CALL:
105 case R_ARM_JUMP24:
106 if (sym->st_value & 3) {
107 pr_err("%s: section %u reloc %u sym '%s': unsupported interworking call (ARM -> Thumb)\n",
108 module->name, relindex, i, symname);
109 return -ENOEXEC;
110 }
111
112 offset = __mem_to_opcode_arm(*(u32 *)loc);
113 offset = (offset & 0x00ffffff) << 2;
114 if (offset & 0x02000000)
115 offset -= 0x04000000;
116
117 offset += sym->st_value - loc;
118
119 /*
120 * Route through a PLT entry if 'offset' exceeds the
121 * supported range. Note that 'offset + loc + 8'
122 * contains the absolute jump target, i.e.,
123 * @sym + addend, corrected for the +8 PC bias.
124 */
125 if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS) &&
126 (offset <= (s32)0xfe000000 ||
127 offset >= (s32)0x02000000))
128 offset = get_module_plt(module, loc,
129 offset + loc + 8)
130 - loc - 8;
131
132 if (offset <= (s32)0xfe000000 ||
133 offset >= (s32)0x02000000) {
134 pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
135 module->name, relindex, i, symname,
136 ELF32_R_TYPE(rel->r_info), loc,
137 sym->st_value);
138 return -ENOEXEC;
139 }
140
141 offset >>= 2;
142 offset &= 0x00ffffff;
143
144 *(u32 *)loc &= __opcode_to_mem_arm(0xff000000);
145 *(u32 *)loc |= __opcode_to_mem_arm(offset);
146 break;
147
148 case R_ARM_V4BX:
149 /* Preserve Rm and the condition code. Alter
150 * other bits to re-code instruction as
151 * MOV PC,Rm.
152 */
153 *(u32 *)loc &= __opcode_to_mem_arm(0xf000000f);
154 *(u32 *)loc |= __opcode_to_mem_arm(0x01a0f000);
155 break;
156
157 case R_ARM_PREL31:
158 offset = *(u32 *)loc + sym->st_value - loc;
159 *(u32 *)loc = offset & 0x7fffffff;
160 break;
161
162 case R_ARM_MOVW_ABS_NC:
163 case R_ARM_MOVT_ABS:
164 offset = tmp = __mem_to_opcode_arm(*(u32 *)loc);
165 offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff);
166 offset = (offset ^ 0x8000) - 0x8000;
167
168 offset += sym->st_value;
169 if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS)
170 offset >>= 16;
171
172 tmp &= 0xfff0f000;
173 tmp |= ((offset & 0xf000) << 4) |
174 (offset & 0x0fff);
175
176 *(u32 *)loc = __opcode_to_mem_arm(tmp);
177 break;
178
179#ifdef CONFIG_THUMB2_KERNEL
180 case R_ARM_THM_CALL:
181 case R_ARM_THM_JUMP24:
182 /*
183 * For function symbols, only Thumb addresses are
184 * allowed (no interworking).
185 *
186 * For non-function symbols, the destination
187 * has no specific ARM/Thumb disposition, so
188 * the branch is resolved under the assumption
189 * that interworking is not required.
190 */
191 if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC &&
192 !(sym->st_value & 1)) {
193 pr_err("%s: section %u reloc %u sym '%s': unsupported interworking call (Thumb -> ARM)\n",
194 module->name, relindex, i, symname);
195 return -ENOEXEC;
196 }
197
198 upper = __mem_to_opcode_thumb16(*(u16 *)loc);
199 lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2));
200
201 /*
202 * 25 bit signed address range (Thumb-2 BL and B.W
203 * instructions):
204 * S:I1:I2:imm10:imm11:0
205 * where:
206 * S = upper[10] = offset[24]
207 * I1 = ~(J1 ^ S) = offset[23]
208 * I2 = ~(J2 ^ S) = offset[22]
209 * imm10 = upper[9:0] = offset[21:12]
210 * imm11 = lower[10:0] = offset[11:1]
211 * J1 = lower[13]
212 * J2 = lower[11]
213 */
214 sign = (upper >> 10) & 1;
215 j1 = (lower >> 13) & 1;
216 j2 = (lower >> 11) & 1;
217 offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) |
218 ((~(j2 ^ sign) & 1) << 22) |
219 ((upper & 0x03ff) << 12) |
220 ((lower & 0x07ff) << 1);
221 if (offset & 0x01000000)
222 offset -= 0x02000000;
223 offset += sym->st_value - loc;
224
225 /*
226 * Route through a PLT entry if 'offset' exceeds the
227 * supported range.
228 */
229 if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS) &&
230 (offset <= (s32)0xff000000 ||
231 offset >= (s32)0x01000000))
232 offset = get_module_plt(module, loc,
233 offset + loc + 4)
234 - loc - 4;
235
236 if (offset <= (s32)0xff000000 ||
237 offset >= (s32)0x01000000) {
238 pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
239 module->name, relindex, i, symname,
240 ELF32_R_TYPE(rel->r_info), loc,
241 sym->st_value);
242 return -ENOEXEC;
243 }
244
245 sign = (offset >> 24) & 1;
246 j1 = sign ^ (~(offset >> 23) & 1);
247 j2 = sign ^ (~(offset >> 22) & 1);
248 upper = (u16)((upper & 0xf800) | (sign << 10) |
249 ((offset >> 12) & 0x03ff));
250 lower = (u16)((lower & 0xd000) |
251 (j1 << 13) | (j2 << 11) |
252 ((offset >> 1) & 0x07ff));
253
254 *(u16 *)loc = __opcode_to_mem_thumb16(upper);
255 *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower);
256 break;
257
258 case R_ARM_THM_MOVW_ABS_NC:
259 case R_ARM_THM_MOVT_ABS:
260 upper = __mem_to_opcode_thumb16(*(u16 *)loc);
261 lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2));
262
263 /*
264 * MOVT/MOVW instructions encoding in Thumb-2:
265 *
266 * i = upper[10]
267 * imm4 = upper[3:0]
268 * imm3 = lower[14:12]
269 * imm8 = lower[7:0]
270 *
271 * imm16 = imm4:i:imm3:imm8
272 */
273 offset = ((upper & 0x000f) << 12) |
274 ((upper & 0x0400) << 1) |
275 ((lower & 0x7000) >> 4) | (lower & 0x00ff);
276 offset = (offset ^ 0x8000) - 0x8000;
277 offset += sym->st_value;
278
279 if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS)
280 offset >>= 16;
281
282 upper = (u16)((upper & 0xfbf0) |
283 ((offset & 0xf000) >> 12) |
284 ((offset & 0x0800) >> 1));
285 lower = (u16)((lower & 0x8f00) |
286 ((offset & 0x0700) << 4) |
287 (offset & 0x00ff));
288 *(u16 *)loc = __opcode_to_mem_thumb16(upper);
289 *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower);
290 break;
291#endif
292
293 default:
294 pr_err("%s: unknown relocation: %u\n",
295 module->name, ELF32_R_TYPE(rel->r_info));
296 return -ENOEXEC;
297 }
298 }
299 return 0;
300}
301
302struct mod_unwind_map {
303 const Elf_Shdr *unw_sec;
304 const Elf_Shdr *txt_sec;
305};
306
307static const Elf_Shdr *find_mod_section(const Elf32_Ehdr *hdr,
308 const Elf_Shdr *sechdrs, const char *name)
309{
310 const Elf_Shdr *s, *se;
311 const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
312
313 for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++)
314 if (strcmp(name, secstrs + s->sh_name) == 0)
315 return s;
316
317 return NULL;
318}
319
320extern void fixup_pv_table(const void *, unsigned long);
321extern void fixup_smp(const void *, unsigned long);
322
323int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
324 struct module *mod)
325{
326 const Elf_Shdr *s = NULL;
327#ifdef CONFIG_ARM_UNWIND
328 const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
329 const Elf_Shdr *sechdrs_end = sechdrs + hdr->e_shnum;
330 struct mod_unwind_map maps[ARM_SEC_MAX];
331 int i;
332
333 memset(maps, 0, sizeof(maps));
334
335 for (s = sechdrs; s < sechdrs_end; s++) {
336 const char *secname = secstrs + s->sh_name;
337
338 if (!(s->sh_flags & SHF_ALLOC))
339 continue;
340
341 if (strcmp(".ARM.exidx.init.text", secname) == 0)
342 maps[ARM_SEC_INIT].unw_sec = s;
343 else if (strcmp(".ARM.exidx", secname) == 0)
344 maps[ARM_SEC_CORE].unw_sec = s;
345 else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
346 maps[ARM_SEC_EXIT].unw_sec = s;
347 else if (strcmp(".ARM.exidx.text.unlikely", secname) == 0)
348 maps[ARM_SEC_UNLIKELY].unw_sec = s;
349 else if (strcmp(".ARM.exidx.text.hot", secname) == 0)
350 maps[ARM_SEC_HOT].unw_sec = s;
351 else if (strcmp(".init.text", secname) == 0)
352 maps[ARM_SEC_INIT].txt_sec = s;
353 else if (strcmp(".text", secname) == 0)
354 maps[ARM_SEC_CORE].txt_sec = s;
355 else if (strcmp(".exit.text", secname) == 0)
356 maps[ARM_SEC_EXIT].txt_sec = s;
357 else if (strcmp(".text.unlikely", secname) == 0)
358 maps[ARM_SEC_UNLIKELY].txt_sec = s;
359 else if (strcmp(".text.hot", secname) == 0)
360 maps[ARM_SEC_HOT].txt_sec = s;
361 }
362
363 for (i = 0; i < ARM_SEC_MAX; i++)
364 if (maps[i].unw_sec && maps[i].txt_sec)
365 mod->arch.unwind[i] =
366 unwind_table_add(maps[i].unw_sec->sh_addr,
367 maps[i].unw_sec->sh_size,
368 maps[i].txt_sec->sh_addr,
369 maps[i].txt_sec->sh_size);
370#endif
371#ifdef CONFIG_ARM_PATCH_PHYS_VIRT
372 s = find_mod_section(hdr, sechdrs, ".pv_table");
373 if (s)
374 fixup_pv_table((void *)s->sh_addr, s->sh_size);
375#endif
376 s = find_mod_section(hdr, sechdrs, ".alt.smp.init");
377 if (s && !is_smp())
378#ifdef CONFIG_SMP_ON_UP
379 fixup_smp((void *)s->sh_addr, s->sh_size);
380#else
381 return -EINVAL;
382#endif
383 return 0;
384}
385
386void
387module_arch_cleanup(struct module *mod)
388{
389#ifdef CONFIG_ARM_UNWIND
390 int i;
391
392 for (i = 0; i < ARM_SEC_MAX; i++)
393 if (mod->arch.unwind[i])
394 unwind_table_del(mod->arch.unwind[i]);
395#endif
396}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * linux/arch/arm/kernel/module.c
4 *
5 * Copyright (C) 2002 Russell King.
6 * Modified for nommu by Hyok S. Choi
7 *
8 * Module allocation method suggested by Andi Kleen.
9 */
10#include <linux/module.h>
11#include <linux/moduleloader.h>
12#include <linux/kernel.h>
13#include <linux/mm.h>
14#include <linux/elf.h>
15#include <linux/vmalloc.h>
16#include <linux/fs.h>
17#include <linux/string.h>
18#include <linux/gfp.h>
19
20#include <asm/sections.h>
21#include <asm/smp_plat.h>
22#include <asm/unwind.h>
23#include <asm/opcodes.h>
24
25#ifdef CONFIG_XIP_KERNEL
26/*
27 * The XIP kernel text is mapped in the module area for modules and
28 * some other stuff to work without any indirect relocations.
29 * MODULES_VADDR is redefined here and not in asm/memory.h to avoid
30 * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
31 */
32#undef MODULES_VADDR
33#define MODULES_VADDR (((unsigned long)_exiprom + ~PMD_MASK) & PMD_MASK)
34#endif
35
36#ifdef CONFIG_MMU
37void *module_alloc(unsigned long size)
38{
39 gfp_t gfp_mask = GFP_KERNEL;
40 void *p;
41
42 /* Silence the initial allocation */
43 if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS))
44 gfp_mask |= __GFP_NOWARN;
45
46 p = __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
47 gfp_mask, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
48 __builtin_return_address(0));
49 if (!IS_ENABLED(CONFIG_ARM_MODULE_PLTS) || p)
50 return p;
51 return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
52 GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
53 __builtin_return_address(0));
54}
55#endif
56
57bool module_init_section(const char *name)
58{
59 return strstarts(name, ".init") ||
60 strstarts(name, ".ARM.extab.init") ||
61 strstarts(name, ".ARM.exidx.init");
62}
63
64bool module_exit_section(const char *name)
65{
66 return strstarts(name, ".exit") ||
67 strstarts(name, ".ARM.extab.exit") ||
68 strstarts(name, ".ARM.exidx.exit");
69}
70
71int
72apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
73 unsigned int relindex, struct module *module)
74{
75 Elf32_Shdr *symsec = sechdrs + symindex;
76 Elf32_Shdr *relsec = sechdrs + relindex;
77 Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
78 Elf32_Rel *rel = (void *)relsec->sh_addr;
79 unsigned int i;
80
81 for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
82 unsigned long loc;
83 Elf32_Sym *sym;
84 const char *symname;
85 s32 offset;
86 u32 tmp;
87#ifdef CONFIG_THUMB2_KERNEL
88 u32 upper, lower, sign, j1, j2;
89#endif
90
91 offset = ELF32_R_SYM(rel->r_info);
92 if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
93 pr_err("%s: section %u reloc %u: bad relocation sym offset\n",
94 module->name, relindex, i);
95 return -ENOEXEC;
96 }
97
98 sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
99 symname = strtab + sym->st_name;
100
101 if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) {
102 pr_err("%s: section %u reloc %u sym '%s': out of bounds relocation, offset %d size %u\n",
103 module->name, relindex, i, symname,
104 rel->r_offset, dstsec->sh_size);
105 return -ENOEXEC;
106 }
107
108 loc = dstsec->sh_addr + rel->r_offset;
109
110 switch (ELF32_R_TYPE(rel->r_info)) {
111 case R_ARM_NONE:
112 /* ignore */
113 break;
114
115 case R_ARM_ABS32:
116 case R_ARM_TARGET1:
117 *(u32 *)loc += sym->st_value;
118 break;
119
120 case R_ARM_PC24:
121 case R_ARM_CALL:
122 case R_ARM_JUMP24:
123 if (sym->st_value & 3) {
124 pr_err("%s: section %u reloc %u sym '%s': unsupported interworking call (ARM -> Thumb)\n",
125 module->name, relindex, i, symname);
126 return -ENOEXEC;
127 }
128
129 offset = __mem_to_opcode_arm(*(u32 *)loc);
130 offset = (offset & 0x00ffffff) << 2;
131 if (offset & 0x02000000)
132 offset -= 0x04000000;
133
134 offset += sym->st_value - loc;
135
136 /*
137 * Route through a PLT entry if 'offset' exceeds the
138 * supported range. Note that 'offset + loc + 8'
139 * contains the absolute jump target, i.e.,
140 * @sym + addend, corrected for the +8 PC bias.
141 */
142 if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS) &&
143 (offset <= (s32)0xfe000000 ||
144 offset >= (s32)0x02000000))
145 offset = get_module_plt(module, loc,
146 offset + loc + 8)
147 - loc - 8;
148
149 if (offset <= (s32)0xfe000000 ||
150 offset >= (s32)0x02000000) {
151 pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
152 module->name, relindex, i, symname,
153 ELF32_R_TYPE(rel->r_info), loc,
154 sym->st_value);
155 return -ENOEXEC;
156 }
157
158 offset >>= 2;
159 offset &= 0x00ffffff;
160
161 *(u32 *)loc &= __opcode_to_mem_arm(0xff000000);
162 *(u32 *)loc |= __opcode_to_mem_arm(offset);
163 break;
164
165 case R_ARM_V4BX:
166 /* Preserve Rm and the condition code. Alter
167 * other bits to re-code instruction as
168 * MOV PC,Rm.
169 */
170 *(u32 *)loc &= __opcode_to_mem_arm(0xf000000f);
171 *(u32 *)loc |= __opcode_to_mem_arm(0x01a0f000);
172 break;
173
174 case R_ARM_PREL31:
175 offset = (*(s32 *)loc << 1) >> 1; /* sign extend */
176 offset += sym->st_value - loc;
177 if (offset >= 0x40000000 || offset < -0x40000000) {
178 pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
179 module->name, relindex, i, symname,
180 ELF32_R_TYPE(rel->r_info), loc,
181 sym->st_value);
182 return -ENOEXEC;
183 }
184 *(u32 *)loc &= 0x80000000;
185 *(u32 *)loc |= offset & 0x7fffffff;
186 break;
187
188 case R_ARM_MOVW_ABS_NC:
189 case R_ARM_MOVT_ABS:
190 offset = tmp = __mem_to_opcode_arm(*(u32 *)loc);
191 offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff);
192 offset = (offset ^ 0x8000) - 0x8000;
193
194 offset += sym->st_value;
195 if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS)
196 offset >>= 16;
197
198 tmp &= 0xfff0f000;
199 tmp |= ((offset & 0xf000) << 4) |
200 (offset & 0x0fff);
201
202 *(u32 *)loc = __opcode_to_mem_arm(tmp);
203 break;
204
205#ifdef CONFIG_THUMB2_KERNEL
206 case R_ARM_THM_CALL:
207 case R_ARM_THM_JUMP24:
208 /*
209 * For function symbols, only Thumb addresses are
210 * allowed (no interworking).
211 *
212 * For non-function symbols, the destination
213 * has no specific ARM/Thumb disposition, so
214 * the branch is resolved under the assumption
215 * that interworking is not required.
216 */
217 if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC &&
218 !(sym->st_value & 1)) {
219 pr_err("%s: section %u reloc %u sym '%s': unsupported interworking call (Thumb -> ARM)\n",
220 module->name, relindex, i, symname);
221 return -ENOEXEC;
222 }
223
224 upper = __mem_to_opcode_thumb16(*(u16 *)loc);
225 lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2));
226
227 /*
228 * 25 bit signed address range (Thumb-2 BL and B.W
229 * instructions):
230 * S:I1:I2:imm10:imm11:0
231 * where:
232 * S = upper[10] = offset[24]
233 * I1 = ~(J1 ^ S) = offset[23]
234 * I2 = ~(J2 ^ S) = offset[22]
235 * imm10 = upper[9:0] = offset[21:12]
236 * imm11 = lower[10:0] = offset[11:1]
237 * J1 = lower[13]
238 * J2 = lower[11]
239 */
240 sign = (upper >> 10) & 1;
241 j1 = (lower >> 13) & 1;
242 j2 = (lower >> 11) & 1;
243 offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) |
244 ((~(j2 ^ sign) & 1) << 22) |
245 ((upper & 0x03ff) << 12) |
246 ((lower & 0x07ff) << 1);
247 if (offset & 0x01000000)
248 offset -= 0x02000000;
249 offset += sym->st_value - loc;
250
251 /*
252 * Route through a PLT entry if 'offset' exceeds the
253 * supported range.
254 */
255 if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS) &&
256 (offset <= (s32)0xff000000 ||
257 offset >= (s32)0x01000000))
258 offset = get_module_plt(module, loc,
259 offset + loc + 4)
260 - loc - 4;
261
262 if (offset <= (s32)0xff000000 ||
263 offset >= (s32)0x01000000) {
264 pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
265 module->name, relindex, i, symname,
266 ELF32_R_TYPE(rel->r_info), loc,
267 sym->st_value);
268 return -ENOEXEC;
269 }
270
271 sign = (offset >> 24) & 1;
272 j1 = sign ^ (~(offset >> 23) & 1);
273 j2 = sign ^ (~(offset >> 22) & 1);
274 upper = (u16)((upper & 0xf800) | (sign << 10) |
275 ((offset >> 12) & 0x03ff));
276 lower = (u16)((lower & 0xd000) |
277 (j1 << 13) | (j2 << 11) |
278 ((offset >> 1) & 0x07ff));
279
280 *(u16 *)loc = __opcode_to_mem_thumb16(upper);
281 *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower);
282 break;
283
284 case R_ARM_THM_MOVW_ABS_NC:
285 case R_ARM_THM_MOVT_ABS:
286 upper = __mem_to_opcode_thumb16(*(u16 *)loc);
287 lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2));
288
289 /*
290 * MOVT/MOVW instructions encoding in Thumb-2:
291 *
292 * i = upper[10]
293 * imm4 = upper[3:0]
294 * imm3 = lower[14:12]
295 * imm8 = lower[7:0]
296 *
297 * imm16 = imm4:i:imm3:imm8
298 */
299 offset = ((upper & 0x000f) << 12) |
300 ((upper & 0x0400) << 1) |
301 ((lower & 0x7000) >> 4) | (lower & 0x00ff);
302 offset = (offset ^ 0x8000) - 0x8000;
303 offset += sym->st_value;
304
305 if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS)
306 offset >>= 16;
307
308 upper = (u16)((upper & 0xfbf0) |
309 ((offset & 0xf000) >> 12) |
310 ((offset & 0x0800) >> 1));
311 lower = (u16)((lower & 0x8f00) |
312 ((offset & 0x0700) << 4) |
313 (offset & 0x00ff));
314 *(u16 *)loc = __opcode_to_mem_thumb16(upper);
315 *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower);
316 break;
317#endif
318
319 default:
320 pr_err("%s: unknown relocation: %u\n",
321 module->name, ELF32_R_TYPE(rel->r_info));
322 return -ENOEXEC;
323 }
324 }
325 return 0;
326}
327
328struct mod_unwind_map {
329 const Elf_Shdr *unw_sec;
330 const Elf_Shdr *txt_sec;
331};
332
333static const Elf_Shdr *find_mod_section(const Elf32_Ehdr *hdr,
334 const Elf_Shdr *sechdrs, const char *name)
335{
336 const Elf_Shdr *s, *se;
337 const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
338
339 for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++)
340 if (strcmp(name, secstrs + s->sh_name) == 0)
341 return s;
342
343 return NULL;
344}
345
346extern void fixup_pv_table(const void *, unsigned long);
347extern void fixup_smp(const void *, unsigned long);
348
349int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
350 struct module *mod)
351{
352 const Elf_Shdr *s = NULL;
353#ifdef CONFIG_ARM_UNWIND
354 const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
355 const Elf_Shdr *sechdrs_end = sechdrs + hdr->e_shnum;
356 struct mod_unwind_map maps[ARM_SEC_MAX];
357 int i;
358
359 memset(maps, 0, sizeof(maps));
360
361 for (s = sechdrs; s < sechdrs_end; s++) {
362 const char *secname = secstrs + s->sh_name;
363
364 if (!(s->sh_flags & SHF_ALLOC))
365 continue;
366
367 if (strcmp(".ARM.exidx.init.text", secname) == 0)
368 maps[ARM_SEC_INIT].unw_sec = s;
369 else if (strcmp(".ARM.exidx", secname) == 0)
370 maps[ARM_SEC_CORE].unw_sec = s;
371 else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
372 maps[ARM_SEC_EXIT].unw_sec = s;
373 else if (strcmp(".ARM.exidx.text.unlikely", secname) == 0)
374 maps[ARM_SEC_UNLIKELY].unw_sec = s;
375 else if (strcmp(".ARM.exidx.text.hot", secname) == 0)
376 maps[ARM_SEC_HOT].unw_sec = s;
377 else if (strcmp(".init.text", secname) == 0)
378 maps[ARM_SEC_INIT].txt_sec = s;
379 else if (strcmp(".text", secname) == 0)
380 maps[ARM_SEC_CORE].txt_sec = s;
381 else if (strcmp(".exit.text", secname) == 0)
382 maps[ARM_SEC_EXIT].txt_sec = s;
383 else if (strcmp(".text.unlikely", secname) == 0)
384 maps[ARM_SEC_UNLIKELY].txt_sec = s;
385 else if (strcmp(".text.hot", secname) == 0)
386 maps[ARM_SEC_HOT].txt_sec = s;
387 }
388
389 for (i = 0; i < ARM_SEC_MAX; i++)
390 if (maps[i].unw_sec && maps[i].txt_sec)
391 mod->arch.unwind[i] =
392 unwind_table_add(maps[i].unw_sec->sh_addr,
393 maps[i].unw_sec->sh_size,
394 maps[i].txt_sec->sh_addr,
395 maps[i].txt_sec->sh_size);
396#endif
397#ifdef CONFIG_ARM_PATCH_PHYS_VIRT
398 s = find_mod_section(hdr, sechdrs, ".pv_table");
399 if (s)
400 fixup_pv_table((void *)s->sh_addr, s->sh_size);
401#endif
402 s = find_mod_section(hdr, sechdrs, ".alt.smp.init");
403 if (s && !is_smp())
404#ifdef CONFIG_SMP_ON_UP
405 fixup_smp((void *)s->sh_addr, s->sh_size);
406#else
407 return -EINVAL;
408#endif
409 return 0;
410}
411
412void
413module_arch_cleanup(struct module *mod)
414{
415#ifdef CONFIG_ARM_UNWIND
416 int i;
417
418 for (i = 0; i < ARM_SEC_MAX; i++) {
419 unwind_table_del(mod->arch.unwind[i]);
420 mod->arch.unwind[i] = NULL;
421 }
422#endif
423}
424
425void __weak module_arch_freeing_init(struct module *mod)
426{
427#ifdef CONFIG_ARM_UNWIND
428 unwind_table_del(mod->arch.unwind[ARM_SEC_INIT]);
429 mod->arch.unwind[ARM_SEC_INIT] = NULL;
430#endif
431}