Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/arch/arm/kernel/module.c | |
3 | * | |
4 | * Copyright (C) 2002 Russell King. | |
6a570b28 | 5 | * Modified for nommu by Hyok S. Choi |
1da177e4 LT |
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 | */ | |
1da177e4 | 13 | #include <linux/module.h> |
f339ab3d | 14 | #include <linux/moduleloader.h> |
1da177e4 | 15 | #include <linux/kernel.h> |
27ac792c | 16 | #include <linux/mm.h> |
1da177e4 LT |
17 | #include <linux/elf.h> |
18 | #include <linux/vmalloc.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/string.h> | |
22 | ||
23 | #include <asm/pgtable.h> | |
37efe642 | 24 | #include <asm/sections.h> |
2e1926e7 | 25 | #include <asm/unwind.h> |
1da177e4 LT |
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. | |
ab4f2ee1 | 31 | * MODULES_VADDR is redefined here and not in asm/memory.h to avoid |
1da177e4 LT |
32 | * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. |
33 | */ | |
ab4f2ee1 | 34 | #undef MODULES_VADDR |
37efe642 | 35 | #define MODULES_VADDR (((unsigned long)_etext + ~PGDIR_MASK) & PGDIR_MASK) |
1da177e4 LT |
36 | #endif |
37 | ||
6a570b28 | 38 | #ifdef CONFIG_MMU |
1da177e4 LT |
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 | ||
ab4f2ee1 | 47 | area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END); |
1da177e4 LT |
48 | if (!area) |
49 | return NULL; | |
50 | ||
8ec53663 | 51 | return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC); |
1da177e4 | 52 | } |
6a570b28 HC |
53 | #else /* CONFIG_MMU */ |
54 | void *module_alloc(unsigned long size) | |
55 | { | |
56 | return size == 0 ? NULL : vmalloc(size); | |
57 | } | |
58 | #endif /* !CONFIG_MMU */ | |
1da177e4 LT |
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 | { | |
2e1926e7 CM |
70 | #ifdef CONFIG_ARM_UNWIND |
71 | Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum; | |
72 | ||
73 | for (s = sechdrs; s < sechdrs_end; s++) { | |
74 | if (strcmp(".ARM.exidx.init.text", secstrings + s->sh_name) == 0) | |
75 | mod->arch.unw_sec_init = s; | |
76 | else if (strcmp(".ARM.exidx.devinit.text", secstrings + s->sh_name) == 0) | |
77 | mod->arch.unw_sec_devinit = s; | |
78 | else if (strcmp(".ARM.exidx", secstrings + s->sh_name) == 0) | |
79 | mod->arch.unw_sec_core = s; | |
80 | else if (strcmp(".init.text", secstrings + s->sh_name) == 0) | |
81 | mod->arch.sec_init_text = s; | |
82 | else if (strcmp(".devinit.text", secstrings + s->sh_name) == 0) | |
83 | mod->arch.sec_devinit_text = s; | |
84 | else if (strcmp(".text", secstrings + s->sh_name) == 0) | |
85 | mod->arch.sec_core_text = s; | |
86 | } | |
87 | #endif | |
1da177e4 LT |
88 | return 0; |
89 | } | |
90 | ||
91 | int | |
92 | apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, | |
93 | unsigned int relindex, struct module *module) | |
94 | { | |
95 | Elf32_Shdr *symsec = sechdrs + symindex; | |
96 | Elf32_Shdr *relsec = sechdrs + relindex; | |
97 | Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; | |
98 | Elf32_Rel *rel = (void *)relsec->sh_addr; | |
99 | unsigned int i; | |
100 | ||
101 | for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { | |
102 | unsigned long loc; | |
103 | Elf32_Sym *sym; | |
104 | s32 offset; | |
adca6dc2 | 105 | u32 upper, lower, sign, j1, j2; |
1da177e4 LT |
106 | |
107 | offset = ELF32_R_SYM(rel->r_info); | |
108 | if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { | |
109 | printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n", | |
110 | module->name, relindex, i); | |
111 | return -ENOEXEC; | |
112 | } | |
113 | ||
114 | sym = ((Elf32_Sym *)symsec->sh_addr) + offset; | |
115 | ||
116 | if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) { | |
117 | printk(KERN_ERR "%s: out of bounds relocation, " | |
118 | "section %d reloc %d offset %d size %d\n", | |
119 | module->name, relindex, i, rel->r_offset, | |
120 | dstsec->sh_size); | |
121 | return -ENOEXEC; | |
122 | } | |
123 | ||
124 | loc = dstsec->sh_addr + rel->r_offset; | |
125 | ||
126 | switch (ELF32_R_TYPE(rel->r_info)) { | |
2e1926e7 CM |
127 | case R_ARM_NONE: |
128 | /* ignore */ | |
129 | break; | |
130 | ||
1da177e4 LT |
131 | case R_ARM_ABS32: |
132 | *(u32 *)loc += sym->st_value; | |
133 | break; | |
134 | ||
135 | case R_ARM_PC24: | |
c2e26114 DJ |
136 | case R_ARM_CALL: |
137 | case R_ARM_JUMP24: | |
1da177e4 LT |
138 | offset = (*(u32 *)loc & 0x00ffffff) << 2; |
139 | if (offset & 0x02000000) | |
140 | offset -= 0x04000000; | |
141 | ||
142 | offset += sym->st_value - loc; | |
143 | if (offset & 3 || | |
c5f12503 KW |
144 | offset <= (s32)0xfe000000 || |
145 | offset >= (s32)0x02000000) { | |
1da177e4 LT |
146 | printk(KERN_ERR |
147 | "%s: relocation out of range, section " | |
148 | "%d reloc %d sym '%s'\n", module->name, | |
149 | relindex, i, strtab + sym->st_name); | |
150 | return -ENOEXEC; | |
151 | } | |
152 | ||
153 | offset >>= 2; | |
154 | ||
155 | *(u32 *)loc &= 0xff000000; | |
156 | *(u32 *)loc |= offset & 0x00ffffff; | |
157 | break; | |
158 | ||
4731f8b6 DS |
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 &= 0xf000000f; | |
165 | *(u32 *)loc |= 0x01a0f000; | |
166 | break; | |
167 | ||
2e1926e7 CM |
168 | case R_ARM_PREL31: |
169 | offset = *(u32 *)loc + sym->st_value - loc; | |
170 | *(u32 *)loc = offset & 0x7fffffff; | |
171 | break; | |
172 | ||
ae51e609 PG |
173 | case R_ARM_MOVW_ABS_NC: |
174 | case R_ARM_MOVT_ABS: | |
175 | offset = *(u32 *)loc; | |
176 | offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff); | |
177 | offset = (offset ^ 0x8000) - 0x8000; | |
178 | ||
179 | offset += sym->st_value; | |
180 | if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS) | |
181 | offset >>= 16; | |
182 | ||
183 | *(u32 *)loc &= 0xfff0f000; | |
184 | *(u32 *)loc |= ((offset & 0xf000) << 4) | | |
185 | (offset & 0x0fff); | |
186 | break; | |
187 | ||
adca6dc2 CM |
188 | case R_ARM_THM_CALL: |
189 | case R_ARM_THM_JUMP24: | |
190 | upper = *(u16 *)loc; | |
191 | lower = *(u16 *)(loc + 2); | |
192 | ||
193 | /* | |
194 | * 25 bit signed address range (Thumb-2 BL and B.W | |
195 | * instructions): | |
196 | * S:I1:I2:imm10:imm11:0 | |
197 | * where: | |
198 | * S = upper[10] = offset[24] | |
199 | * I1 = ~(J1 ^ S) = offset[23] | |
200 | * I2 = ~(J2 ^ S) = offset[22] | |
201 | * imm10 = upper[9:0] = offset[21:12] | |
202 | * imm11 = lower[10:0] = offset[11:1] | |
203 | * J1 = lower[13] | |
204 | * J2 = lower[11] | |
205 | */ | |
206 | sign = (upper >> 10) & 1; | |
207 | j1 = (lower >> 13) & 1; | |
208 | j2 = (lower >> 11) & 1; | |
209 | offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) | | |
210 | ((~(j2 ^ sign) & 1) << 22) | | |
211 | ((upper & 0x03ff) << 12) | | |
212 | ((lower & 0x07ff) << 1); | |
213 | if (offset & 0x01000000) | |
214 | offset -= 0x02000000; | |
215 | offset += sym->st_value - loc; | |
216 | ||
217 | /* only Thumb addresses allowed (no interworking) */ | |
218 | if (!(offset & 1) || | |
219 | offset <= (s32)0xff000000 || | |
220 | offset >= (s32)0x01000000) { | |
221 | printk(KERN_ERR | |
222 | "%s: relocation out of range, section " | |
223 | "%d reloc %d sym '%s'\n", module->name, | |
224 | relindex, i, strtab + sym->st_name); | |
225 | return -ENOEXEC; | |
226 | } | |
227 | ||
228 | sign = (offset >> 24) & 1; | |
229 | j1 = sign ^ (~(offset >> 23) & 1); | |
230 | j2 = sign ^ (~(offset >> 22) & 1); | |
231 | *(u16 *)loc = (u16)((upper & 0xf800) | (sign << 10) | | |
232 | ((offset >> 12) & 0x03ff)); | |
233 | *(u16 *)(loc + 2) = (u16)((lower & 0xd000) | | |
234 | (j1 << 13) | (j2 << 11) | | |
235 | ((offset >> 1) & 0x07ff)); | |
236 | upper = *(u16 *)loc; | |
237 | lower = *(u16 *)(loc + 2); | |
238 | break; | |
239 | ||
1da177e4 LT |
240 | default: |
241 | printk(KERN_ERR "%s: unknown relocation: %u\n", | |
242 | module->name, ELF32_R_TYPE(rel->r_info)); | |
243 | return -ENOEXEC; | |
244 | } | |
245 | } | |
246 | return 0; | |
247 | } | |
248 | ||
249 | int | |
250 | apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, | |
251 | unsigned int symindex, unsigned int relsec, struct module *module) | |
252 | { | |
253 | printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n", | |
254 | module->name); | |
255 | return -ENOEXEC; | |
256 | } | |
257 | ||
2e1926e7 CM |
258 | #ifdef CONFIG_ARM_UNWIND |
259 | static void register_unwind_tables(struct module *mod) | |
260 | { | |
261 | if (mod->arch.unw_sec_init && mod->arch.sec_init_text) | |
262 | mod->arch.unwind_init = | |
263 | unwind_table_add(mod->arch.unw_sec_init->sh_addr, | |
264 | mod->arch.unw_sec_init->sh_size, | |
265 | mod->arch.sec_init_text->sh_addr, | |
266 | mod->arch.sec_init_text->sh_size); | |
267 | if (mod->arch.unw_sec_devinit && mod->arch.sec_devinit_text) | |
268 | mod->arch.unwind_devinit = | |
269 | unwind_table_add(mod->arch.unw_sec_devinit->sh_addr, | |
270 | mod->arch.unw_sec_devinit->sh_size, | |
271 | mod->arch.sec_devinit_text->sh_addr, | |
272 | mod->arch.sec_devinit_text->sh_size); | |
273 | if (mod->arch.unw_sec_core && mod->arch.sec_core_text) | |
274 | mod->arch.unwind_core = | |
275 | unwind_table_add(mod->arch.unw_sec_core->sh_addr, | |
276 | mod->arch.unw_sec_core->sh_size, | |
277 | mod->arch.sec_core_text->sh_addr, | |
278 | mod->arch.sec_core_text->sh_size); | |
279 | } | |
280 | ||
281 | static void unregister_unwind_tables(struct module *mod) | |
282 | { | |
283 | unwind_table_del(mod->arch.unwind_init); | |
284 | unwind_table_del(mod->arch.unwind_devinit); | |
285 | unwind_table_del(mod->arch.unwind_core); | |
286 | } | |
287 | #else | |
288 | static inline void register_unwind_tables(struct module *mod) { } | |
289 | static inline void unregister_unwind_tables(struct module *mod) { } | |
290 | #endif | |
291 | ||
1da177e4 LT |
292 | int |
293 | module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, | |
294 | struct module *module) | |
295 | { | |
2e1926e7 | 296 | register_unwind_tables(module); |
1da177e4 LT |
297 | return 0; |
298 | } | |
299 | ||
300 | void | |
301 | module_arch_cleanup(struct module *mod) | |
302 | { | |
2e1926e7 | 303 | unregister_unwind_tables(mod); |
1da177e4 | 304 | } |