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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}
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)_etext + ~PMD_MASK) & PMD_MASK)
38#endif
39
40#ifdef CONFIG_MMU
41void *module_alloc(unsigned long size)
42{
43 return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
44 GFP_KERNEL, PAGE_KERNEL_EXEC, NUMA_NO_NODE,
45 __builtin_return_address(0));
46}
47#endif
48
49int
50apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
51 unsigned int relindex, struct module *module)
52{
53 Elf32_Shdr *symsec = sechdrs + symindex;
54 Elf32_Shdr *relsec = sechdrs + relindex;
55 Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
56 Elf32_Rel *rel = (void *)relsec->sh_addr;
57 unsigned int i;
58
59 for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
60 unsigned long loc;
61 Elf32_Sym *sym;
62 const char *symname;
63 s32 offset;
64 u32 tmp;
65#ifdef CONFIG_THUMB2_KERNEL
66 u32 upper, lower, sign, j1, j2;
67#endif
68
69 offset = ELF32_R_SYM(rel->r_info);
70 if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
71 pr_err("%s: section %u reloc %u: bad relocation sym offset\n",
72 module->name, relindex, i);
73 return -ENOEXEC;
74 }
75
76 sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
77 symname = strtab + sym->st_name;
78
79 if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) {
80 pr_err("%s: section %u reloc %u sym '%s': out of bounds relocation, offset %d size %u\n",
81 module->name, relindex, i, symname,
82 rel->r_offset, dstsec->sh_size);
83 return -ENOEXEC;
84 }
85
86 loc = dstsec->sh_addr + rel->r_offset;
87
88 switch (ELF32_R_TYPE(rel->r_info)) {
89 case R_ARM_NONE:
90 /* ignore */
91 break;
92
93 case R_ARM_ABS32:
94 *(u32 *)loc += sym->st_value;
95 break;
96
97 case R_ARM_PC24:
98 case R_ARM_CALL:
99 case R_ARM_JUMP24:
100 offset = __mem_to_opcode_arm(*(u32 *)loc);
101 offset = (offset & 0x00ffffff) << 2;
102 if (offset & 0x02000000)
103 offset -= 0x04000000;
104
105 offset += sym->st_value - loc;
106 if (offset & 3 ||
107 offset <= (s32)0xfe000000 ||
108 offset >= (s32)0x02000000) {
109 pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
110 module->name, relindex, i, symname,
111 ELF32_R_TYPE(rel->r_info), loc,
112 sym->st_value);
113 return -ENOEXEC;
114 }
115
116 offset >>= 2;
117 offset &= 0x00ffffff;
118
119 *(u32 *)loc &= __opcode_to_mem_arm(0xff000000);
120 *(u32 *)loc |= __opcode_to_mem_arm(offset);
121 break;
122
123 case R_ARM_V4BX:
124 /* Preserve Rm and the condition code. Alter
125 * other bits to re-code instruction as
126 * MOV PC,Rm.
127 */
128 *(u32 *)loc &= __opcode_to_mem_arm(0xf000000f);
129 *(u32 *)loc |= __opcode_to_mem_arm(0x01a0f000);
130 break;
131
132 case R_ARM_PREL31:
133 offset = *(u32 *)loc + sym->st_value - loc;
134 *(u32 *)loc = offset & 0x7fffffff;
135 break;
136
137 case R_ARM_MOVW_ABS_NC:
138 case R_ARM_MOVT_ABS:
139 offset = tmp = __mem_to_opcode_arm(*(u32 *)loc);
140 offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff);
141 offset = (offset ^ 0x8000) - 0x8000;
142
143 offset += sym->st_value;
144 if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS)
145 offset >>= 16;
146
147 tmp &= 0xfff0f000;
148 tmp |= ((offset & 0xf000) << 4) |
149 (offset & 0x0fff);
150
151 *(u32 *)loc = __opcode_to_mem_arm(tmp);
152 break;
153
154#ifdef CONFIG_THUMB2_KERNEL
155 case R_ARM_THM_CALL:
156 case R_ARM_THM_JUMP24:
157 upper = __mem_to_opcode_thumb16(*(u16 *)loc);
158 lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2));
159
160 /*
161 * 25 bit signed address range (Thumb-2 BL and B.W
162 * instructions):
163 * S:I1:I2:imm10:imm11:0
164 * where:
165 * S = upper[10] = offset[24]
166 * I1 = ~(J1 ^ S) = offset[23]
167 * I2 = ~(J2 ^ S) = offset[22]
168 * imm10 = upper[9:0] = offset[21:12]
169 * imm11 = lower[10:0] = offset[11:1]
170 * J1 = lower[13]
171 * J2 = lower[11]
172 */
173 sign = (upper >> 10) & 1;
174 j1 = (lower >> 13) & 1;
175 j2 = (lower >> 11) & 1;
176 offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) |
177 ((~(j2 ^ sign) & 1) << 22) |
178 ((upper & 0x03ff) << 12) |
179 ((lower & 0x07ff) << 1);
180 if (offset & 0x01000000)
181 offset -= 0x02000000;
182 offset += sym->st_value - loc;
183
184 /*
185 * For function symbols, only Thumb addresses are
186 * allowed (no interworking).
187 *
188 * For non-function symbols, the destination
189 * has no specific ARM/Thumb disposition, so
190 * the branch is resolved under the assumption
191 * that interworking is not required.
192 */
193 if ((ELF32_ST_TYPE(sym->st_info) == STT_FUNC &&
194 !(offset & 1)) ||
195 offset <= (s32)0xff000000 ||
196 offset >= (s32)0x01000000) {
197 pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
198 module->name, relindex, i, symname,
199 ELF32_R_TYPE(rel->r_info), loc,
200 sym->st_value);
201 return -ENOEXEC;
202 }
203
204 sign = (offset >> 24) & 1;
205 j1 = sign ^ (~(offset >> 23) & 1);
206 j2 = sign ^ (~(offset >> 22) & 1);
207 upper = (u16)((upper & 0xf800) | (sign << 10) |
208 ((offset >> 12) & 0x03ff));
209 lower = (u16)((lower & 0xd000) |
210 (j1 << 13) | (j2 << 11) |
211 ((offset >> 1) & 0x07ff));
212
213 *(u16 *)loc = __opcode_to_mem_thumb16(upper);
214 *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower);
215 break;
216
217 case R_ARM_THM_MOVW_ABS_NC:
218 case R_ARM_THM_MOVT_ABS:
219 upper = __mem_to_opcode_thumb16(*(u16 *)loc);
220 lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2));
221
222 /*
223 * MOVT/MOVW instructions encoding in Thumb-2:
224 *
225 * i = upper[10]
226 * imm4 = upper[3:0]
227 * imm3 = lower[14:12]
228 * imm8 = lower[7:0]
229 *
230 * imm16 = imm4:i:imm3:imm8
231 */
232 offset = ((upper & 0x000f) << 12) |
233 ((upper & 0x0400) << 1) |
234 ((lower & 0x7000) >> 4) | (lower & 0x00ff);
235 offset = (offset ^ 0x8000) - 0x8000;
236 offset += sym->st_value;
237
238 if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS)
239 offset >>= 16;
240
241 upper = (u16)((upper & 0xfbf0) |
242 ((offset & 0xf000) >> 12) |
243 ((offset & 0x0800) >> 1));
244 lower = (u16)((lower & 0x8f00) |
245 ((offset & 0x0700) << 4) |
246 (offset & 0x00ff));
247 *(u16 *)loc = __opcode_to_mem_thumb16(upper);
248 *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower);
249 break;
250#endif
251
252 default:
253 printk(KERN_ERR "%s: unknown relocation: %u\n",
254 module->name, ELF32_R_TYPE(rel->r_info));
255 return -ENOEXEC;
256 }
257 }
258 return 0;
259}
260
261struct mod_unwind_map {
262 const Elf_Shdr *unw_sec;
263 const Elf_Shdr *txt_sec;
264};
265
266static const Elf_Shdr *find_mod_section(const Elf32_Ehdr *hdr,
267 const Elf_Shdr *sechdrs, const char *name)
268{
269 const Elf_Shdr *s, *se;
270 const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
271
272 for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++)
273 if (strcmp(name, secstrs + s->sh_name) == 0)
274 return s;
275
276 return NULL;
277}
278
279extern void fixup_pv_table(const void *, unsigned long);
280extern void fixup_smp(const void *, unsigned long);
281
282int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
283 struct module *mod)
284{
285 const Elf_Shdr *s = NULL;
286#ifdef CONFIG_ARM_UNWIND
287 const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
288 const Elf_Shdr *sechdrs_end = sechdrs + hdr->e_shnum;
289 struct mod_unwind_map maps[ARM_SEC_MAX];
290 int i;
291
292 memset(maps, 0, sizeof(maps));
293
294 for (s = sechdrs; s < sechdrs_end; s++) {
295 const char *secname = secstrs + s->sh_name;
296
297 if (!(s->sh_flags & SHF_ALLOC))
298 continue;
299
300 if (strcmp(".ARM.exidx.init.text", secname) == 0)
301 maps[ARM_SEC_INIT].unw_sec = s;
302 else if (strcmp(".ARM.exidx", secname) == 0)
303 maps[ARM_SEC_CORE].unw_sec = s;
304 else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
305 maps[ARM_SEC_EXIT].unw_sec = s;
306 else if (strcmp(".ARM.exidx.text.unlikely", secname) == 0)
307 maps[ARM_SEC_UNLIKELY].unw_sec = s;
308 else if (strcmp(".ARM.exidx.text.hot", secname) == 0)
309 maps[ARM_SEC_HOT].unw_sec = s;
310 else if (strcmp(".init.text", secname) == 0)
311 maps[ARM_SEC_INIT].txt_sec = s;
312 else if (strcmp(".text", secname) == 0)
313 maps[ARM_SEC_CORE].txt_sec = s;
314 else if (strcmp(".exit.text", secname) == 0)
315 maps[ARM_SEC_EXIT].txt_sec = s;
316 else if (strcmp(".text.unlikely", secname) == 0)
317 maps[ARM_SEC_UNLIKELY].txt_sec = s;
318 else if (strcmp(".text.hot", secname) == 0)
319 maps[ARM_SEC_HOT].txt_sec = s;
320 }
321
322 for (i = 0; i < ARM_SEC_MAX; i++)
323 if (maps[i].unw_sec && maps[i].txt_sec)
324 mod->arch.unwind[i] =
325 unwind_table_add(maps[i].unw_sec->sh_addr,
326 maps[i].unw_sec->sh_size,
327 maps[i].txt_sec->sh_addr,
328 maps[i].txt_sec->sh_size);
329#endif
330#ifdef CONFIG_ARM_PATCH_PHYS_VIRT
331 s = find_mod_section(hdr, sechdrs, ".pv_table");
332 if (s)
333 fixup_pv_table((void *)s->sh_addr, s->sh_size);
334#endif
335 s = find_mod_section(hdr, sechdrs, ".alt.smp.init");
336 if (s && !is_smp())
337#ifdef CONFIG_SMP_ON_UP
338 fixup_smp((void *)s->sh_addr, s->sh_size);
339#else
340 return -EINVAL;
341#endif
342 return 0;
343}
344
345void
346module_arch_cleanup(struct module *mod)
347{
348#ifdef CONFIG_ARM_UNWIND
349 int i;
350
351 for (i = 0; i < ARM_SEC_MAX; i++)
352 if (mod->arch.unwind[i])
353 unwind_table_del(mod->arch.unwind[i]);
354#endif
355}