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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/unwind.h> |
26 | |
27 | #ifdef CONFIG_XIP_KERNEL |
28 | /* |
29 | * The XIP kernel text is mapped in the module area for modules and |
30 | * some other stuff to work without any indirect relocations. |
31 | * MODULES_VADDR is redefined here and not in asm/memory.h to avoid |
32 | * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. |
33 | */ |
34 | #undef MODULES_VADDR |
35 | #define MODULES_VADDR (((unsigned long)_etext + ~PGDIR_MASK) & PGDIR_MASK) |
36 | #endif |
37 | |
38 | #ifdef CONFIG_MMU |
39 | void *module_alloc(unsigned long size) |
40 | { |
41 | struct vm_struct *area; |
42 | |
43 | size = PAGE_ALIGN(size); |
44 | if (!size) |
45 | return NULL; |
46 | |
47 | area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END); |
48 | if (!area) |
49 | return NULL; |
50 | |
51 | return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC); |
52 | } |
53 | #else /* CONFIG_MMU */ |
54 | void *module_alloc(unsigned long size) |
55 | { |
56 | return size == 0 ? NULL : vmalloc(size); |
57 | } |
58 | #endif /* !CONFIG_MMU */ |
59 | |
60 | void module_free(struct module *module, void *region) |
61 | { |
62 | vfree(region); |
63 | } |
64 | |
65 | int module_frob_arch_sections(Elf_Ehdr *hdr, |
66 | Elf_Shdr *sechdrs, |
67 | char *secstrings, |
68 | struct module *mod) |
69 | { |
70 | #ifdef CONFIG_ARM_UNWIND |
71 | Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum; |
72 | struct arm_unwind_mapping *maps = mod->arch.map; |
73 | |
74 | for (s = sechdrs; s < sechdrs_end; s++) { |
75 | char const *secname = secstrings + s->sh_name; |
76 | |
77 | if (strcmp(".ARM.exidx.init.text", secname) == 0) |
78 | maps[ARM_SEC_INIT].unw_sec = s; |
79 | else if (strcmp(".ARM.exidx.devinit.text", secname) == 0) |
80 | maps[ARM_SEC_DEVINIT].unw_sec = s; |
81 | else if (strcmp(".ARM.exidx", secname) == 0) |
82 | maps[ARM_SEC_CORE].unw_sec = s; |
83 | else if (strcmp(".ARM.exidx.exit.text", secname) == 0) |
84 | maps[ARM_SEC_EXIT].unw_sec = s; |
85 | else if (strcmp(".ARM.exidx.devexit.text", secname) == 0) |
86 | maps[ARM_SEC_DEVEXIT].unw_sec = s; |
87 | else if (strcmp(".init.text", secname) == 0) |
88 | maps[ARM_SEC_INIT].sec_text = s; |
89 | else if (strcmp(".devinit.text", secname) == 0) |
90 | maps[ARM_SEC_DEVINIT].sec_text = s; |
91 | else if (strcmp(".text", secname) == 0) |
92 | maps[ARM_SEC_CORE].sec_text = s; |
93 | else if (strcmp(".exit.text", secname) == 0) |
94 | maps[ARM_SEC_EXIT].sec_text = s; |
95 | else if (strcmp(".devexit.text", secname) == 0) |
96 | maps[ARM_SEC_DEVEXIT].sec_text = s; |
97 | } |
98 | #endif |
99 | return 0; |
100 | } |
101 | |
102 | int |
103 | apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, |
104 | unsigned int relindex, struct module *module) |
105 | { |
106 | Elf32_Shdr *symsec = sechdrs + symindex; |
107 | Elf32_Shdr *relsec = sechdrs + relindex; |
108 | Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; |
109 | Elf32_Rel *rel = (void *)relsec->sh_addr; |
110 | unsigned int i; |
111 | |
112 | for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { |
113 | unsigned long loc; |
114 | Elf32_Sym *sym; |
115 | s32 offset; |
116 | #ifdef CONFIG_THUMB2_KERNEL |
117 | u32 upper, lower, sign, j1, j2; |
118 | #endif |
119 | |
120 | offset = ELF32_R_SYM(rel->r_info); |
121 | if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { |
122 | printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n", |
123 | module->name, relindex, i); |
124 | return -ENOEXEC; |
125 | } |
126 | |
127 | sym = ((Elf32_Sym *)symsec->sh_addr) + offset; |
128 | |
129 | if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) { |
130 | printk(KERN_ERR "%s: out of bounds relocation, " |
131 | "section %d reloc %d offset %d size %d\n", |
132 | module->name, relindex, i, rel->r_offset, |
133 | dstsec->sh_size); |
134 | return -ENOEXEC; |
135 | } |
136 | |
137 | loc = dstsec->sh_addr + rel->r_offset; |
138 | |
139 | switch (ELF32_R_TYPE(rel->r_info)) { |
140 | case R_ARM_NONE: |
141 | /* ignore */ |
142 | break; |
143 | |
144 | case R_ARM_ABS32: |
145 | *(u32 *)loc += sym->st_value; |
146 | break; |
147 | |
148 | case R_ARM_PC24: |
149 | case R_ARM_CALL: |
150 | case R_ARM_JUMP24: |
151 | offset = (*(u32 *)loc & 0x00ffffff) << 2; |
152 | if (offset & 0x02000000) |
153 | offset -= 0x04000000; |
154 | |
155 | offset += sym->st_value - loc; |
156 | if (offset & 3 || |
157 | offset <= (s32)0xfe000000 || |
158 | offset >= (s32)0x02000000) { |
159 | printk(KERN_ERR |
160 | "%s: relocation out of range, section " |
161 | "%d reloc %d sym '%s'\n", module->name, |
162 | relindex, i, strtab + sym->st_name); |
163 | return -ENOEXEC; |
164 | } |
165 | |
166 | offset >>= 2; |
167 | |
168 | *(u32 *)loc &= 0xff000000; |
169 | *(u32 *)loc |= offset & 0x00ffffff; |
170 | break; |
171 | |
172 | case R_ARM_V4BX: |
173 | /* Preserve Rm and the condition code. Alter |
174 | * other bits to re-code instruction as |
175 | * MOV PC,Rm. |
176 | */ |
177 | *(u32 *)loc &= 0xf000000f; |
178 | *(u32 *)loc |= 0x01a0f000; |
179 | break; |
180 | |
181 | case R_ARM_PREL31: |
182 | offset = *(u32 *)loc + sym->st_value - loc; |
183 | *(u32 *)loc = offset & 0x7fffffff; |
184 | break; |
185 | |
186 | case R_ARM_MOVW_ABS_NC: |
187 | case R_ARM_MOVT_ABS: |
188 | offset = *(u32 *)loc; |
189 | offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff); |
190 | offset = (offset ^ 0x8000) - 0x8000; |
191 | |
192 | offset += sym->st_value; |
193 | if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS) |
194 | offset >>= 16; |
195 | |
196 | *(u32 *)loc &= 0xfff0f000; |
197 | *(u32 *)loc |= ((offset & 0xf000) << 4) | |
198 | (offset & 0x0fff); |
199 | break; |
200 | |
201 | #ifdef CONFIG_THUMB2_KERNEL |
202 | case R_ARM_THM_CALL: |
203 | case R_ARM_THM_JUMP24: |
204 | upper = *(u16 *)loc; |
205 | lower = *(u16 *)(loc + 2); |
206 | |
207 | /* |
208 | * 25 bit signed address range (Thumb-2 BL and B.W |
209 | * instructions): |
210 | * S:I1:I2:imm10:imm11:0 |
211 | * where: |
212 | * S = upper[10] = offset[24] |
213 | * I1 = ~(J1 ^ S) = offset[23] |
214 | * I2 = ~(J2 ^ S) = offset[22] |
215 | * imm10 = upper[9:0] = offset[21:12] |
216 | * imm11 = lower[10:0] = offset[11:1] |
217 | * J1 = lower[13] |
218 | * J2 = lower[11] |
219 | */ |
220 | sign = (upper >> 10) & 1; |
221 | j1 = (lower >> 13) & 1; |
222 | j2 = (lower >> 11) & 1; |
223 | offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) | |
224 | ((~(j2 ^ sign) & 1) << 22) | |
225 | ((upper & 0x03ff) << 12) | |
226 | ((lower & 0x07ff) << 1); |
227 | if (offset & 0x01000000) |
228 | offset -= 0x02000000; |
229 | offset += sym->st_value - loc; |
230 | |
231 | /* only Thumb addresses allowed (no interworking) */ |
232 | if (!(offset & 1) || |
233 | offset <= (s32)0xff000000 || |
234 | offset >= (s32)0x01000000) { |
235 | printk(KERN_ERR |
236 | "%s: relocation out of range, section " |
237 | "%d reloc %d sym '%s'\n", module->name, |
238 | relindex, i, strtab + sym->st_name); |
239 | return -ENOEXEC; |
240 | } |
241 | |
242 | sign = (offset >> 24) & 1; |
243 | j1 = sign ^ (~(offset >> 23) & 1); |
244 | j2 = sign ^ (~(offset >> 22) & 1); |
245 | *(u16 *)loc = (u16)((upper & 0xf800) | (sign << 10) | |
246 | ((offset >> 12) & 0x03ff)); |
247 | *(u16 *)(loc + 2) = (u16)((lower & 0xd000) | |
248 | (j1 << 13) | (j2 << 11) | |
249 | ((offset >> 1) & 0x07ff)); |
250 | break; |
251 | |
252 | case R_ARM_THM_MOVW_ABS_NC: |
253 | case R_ARM_THM_MOVT_ABS: |
254 | upper = *(u16 *)loc; |
255 | lower = *(u16 *)(loc + 2); |
256 | |
257 | /* |
258 | * MOVT/MOVW instructions encoding in Thumb-2: |
259 | * |
260 | * i = upper[10] |
261 | * imm4 = upper[3:0] |
262 | * imm3 = lower[14:12] |
263 | * imm8 = lower[7:0] |
264 | * |
265 | * imm16 = imm4:i:imm3:imm8 |
266 | */ |
267 | offset = ((upper & 0x000f) << 12) | |
268 | ((upper & 0x0400) << 1) | |
269 | ((lower & 0x7000) >> 4) | (lower & 0x00ff); |
270 | offset = (offset ^ 0x8000) - 0x8000; |
271 | offset += sym->st_value; |
272 | |
273 | if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS) |
274 | offset >>= 16; |
275 | |
276 | *(u16 *)loc = (u16)((upper & 0xfbf0) | |
277 | ((offset & 0xf000) >> 12) | |
278 | ((offset & 0x0800) >> 1)); |
279 | *(u16 *)(loc + 2) = (u16)((lower & 0x8f00) | |
280 | ((offset & 0x0700) << 4) | |
281 | (offset & 0x00ff)); |
282 | break; |
283 | #endif |
284 | |
285 | default: |
286 | printk(KERN_ERR "%s: unknown relocation: %u\n", |
287 | module->name, ELF32_R_TYPE(rel->r_info)); |
288 | return -ENOEXEC; |
289 | } |
290 | } |
291 | return 0; |
292 | } |
293 | |
294 | int |
295 | apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, |
296 | unsigned int symindex, unsigned int relsec, struct module *module) |
297 | { |
298 | printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n", |
299 | module->name); |
300 | return -ENOEXEC; |
301 | } |
302 | |
303 | #ifdef CONFIG_ARM_UNWIND |
304 | static void register_unwind_tables(struct module *mod) |
305 | { |
306 | int i; |
307 | for (i = 0; i < ARM_SEC_MAX; ++i) { |
308 | struct arm_unwind_mapping *map = &mod->arch.map[i]; |
309 | if (map->unw_sec && map->sec_text) |
310 | map->unwind = unwind_table_add(map->unw_sec->sh_addr, |
311 | map->unw_sec->sh_size, |
312 | map->sec_text->sh_addr, |
313 | map->sec_text->sh_size); |
314 | } |
315 | } |
316 | |
317 | static void unregister_unwind_tables(struct module *mod) |
318 | { |
319 | int i = ARM_SEC_MAX; |
320 | while (--i >= 0) |
321 | unwind_table_del(mod->arch.map[i].unwind); |
322 | } |
323 | #else |
324 | static inline void register_unwind_tables(struct module *mod) { } |
325 | static inline void unregister_unwind_tables(struct module *mod) { } |
326 | #endif |
327 | |
328 | int |
329 | module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, |
330 | struct module *module) |
331 | { |
332 | register_unwind_tables(module); |
333 | return 0; |
334 | } |
335 | |
336 | void |
337 | module_arch_cleanup(struct module *mod) |
338 | { |
339 | unregister_unwind_tables(mod); |
340 | } |
341 |
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