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