1
2
3
4
5
6
7
8
9
10
11
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
32
33
34
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
91 break;
92
93 case R_ARM_ABS32:
94 case R_ARM_TARGET1:
95 *(u32 *)loc += sym->st_value;
96 break;
97
98 case R_ARM_PC24:
99 case R_ARM_CALL:
100 case R_ARM_JUMP24:
101 offset = __mem_to_opcode_arm(*(u32 *)loc);
102 offset = (offset & 0x00ffffff) << 2;
103 if (offset & 0x02000000)
104 offset -= 0x04000000;
105
106 offset += sym->st_value - loc;
107 if (offset & 3 ||
108 offset <= (s32)0xfe000000 ||
109 offset >= (s32)0x02000000) {
110 pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
111 module->name, relindex, i, symname,
112 ELF32_R_TYPE(rel->r_info), loc,
113 sym->st_value);
114 return -ENOEXEC;
115 }
116
117 offset >>= 2;
118 offset &= 0x00ffffff;
119
120 *(u32 *)loc &= __opcode_to_mem_arm(0xff000000);
121 *(u32 *)loc |= __opcode_to_mem_arm(offset);
122 break;
123
124 case R_ARM_V4BX:
125
126
127
128
129 *(u32 *)loc &= __opcode_to_mem_arm(0xf000000f);
130 *(u32 *)loc |= __opcode_to_mem_arm(0x01a0f000);
131 break;
132
133 case R_ARM_PREL31:
134 offset = *(u32 *)loc + sym->st_value - loc;
135 *(u32 *)loc = offset & 0x7fffffff;
136 break;
137
138 case R_ARM_MOVW_ABS_NC:
139 case R_ARM_MOVT_ABS:
140 offset = tmp = __mem_to_opcode_arm(*(u32 *)loc);
141 offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff);
142 offset = (offset ^ 0x8000) - 0x8000;
143
144 offset += sym->st_value;
145 if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS)
146 offset >>= 16;
147
148 tmp &= 0xfff0f000;
149 tmp |= ((offset & 0xf000) << 4) |
150 (offset & 0x0fff);
151
152 *(u32 *)loc = __opcode_to_mem_arm(tmp);
153 break;
154
155#ifdef CONFIG_THUMB2_KERNEL
156 case R_ARM_THM_CALL:
157 case R_ARM_THM_JUMP24:
158 upper = __mem_to_opcode_thumb16(*(u16 *)loc);
159 lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2));
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174 sign = (upper >> 10) & 1;
175 j1 = (lower >> 13) & 1;
176 j2 = (lower >> 11) & 1;
177 offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) |
178 ((~(j2 ^ sign) & 1) << 22) |
179 ((upper & 0x03ff) << 12) |
180 ((lower & 0x07ff) << 1);
181 if (offset & 0x01000000)
182 offset -= 0x02000000;
183 offset += sym->st_value - loc;
184
185
186
187
188
189
190
191
192
193
194 if ((ELF32_ST_TYPE(sym->st_info) == STT_FUNC &&
195 !(offset & 1)) ||
196 offset <= (s32)0xff000000 ||
197 offset >= (s32)0x01000000) {
198 pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
199 module->name, relindex, i, symname,
200 ELF32_R_TYPE(rel->r_info), loc,
201 sym->st_value);
202 return -ENOEXEC;
203 }
204
205 sign = (offset >> 24) & 1;
206 j1 = sign ^ (~(offset >> 23) & 1);
207 j2 = sign ^ (~(offset >> 22) & 1);
208 upper = (u16)((upper & 0xf800) | (sign << 10) |
209 ((offset >> 12) & 0x03ff));
210 lower = (u16)((lower & 0xd000) |
211 (j1 << 13) | (j2 << 11) |
212 ((offset >> 1) & 0x07ff));
213
214 *(u16 *)loc = __opcode_to_mem_thumb16(upper);
215 *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower);
216 break;
217
218 case R_ARM_THM_MOVW_ABS_NC:
219 case R_ARM_THM_MOVT_ABS:
220 upper = __mem_to_opcode_thumb16(*(u16 *)loc);
221 lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2));
222
223
224
225
226
227
228
229
230
231
232
233 offset = ((upper & 0x000f) << 12) |
234 ((upper & 0x0400) << 1) |
235 ((lower & 0x7000) >> 4) | (lower & 0x00ff);
236 offset = (offset ^ 0x8000) - 0x8000;
237 offset += sym->st_value;
238
239 if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS)
240 offset >>= 16;
241
242 upper = (u16)((upper & 0xfbf0) |
243 ((offset & 0xf000) >> 12) |
244 ((offset & 0x0800) >> 1));
245 lower = (u16)((lower & 0x8f00) |
246 ((offset & 0x0700) << 4) |
247 (offset & 0x00ff));
248 *(u16 *)loc = __opcode_to_mem_thumb16(upper);
249 *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower);
250 break;
251#endif
252
253 default:
254 printk(KERN_ERR "%s: unknown relocation: %u\n",
255 module->name, ELF32_R_TYPE(rel->r_info));
256 return -ENOEXEC;
257 }
258 }
259 return 0;
260}
261
262struct mod_unwind_map {
263 const Elf_Shdr *unw_sec;
264 const Elf_Shdr *txt_sec;
265};
266
267static const Elf_Shdr *find_mod_section(const Elf32_Ehdr *hdr,
268 const Elf_Shdr *sechdrs, const char *name)
269{
270 const Elf_Shdr *s, *se;
271 const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
272
273 for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++)
274 if (strcmp(name, secstrs + s->sh_name) == 0)
275 return s;
276
277 return NULL;
278}
279
280extern void fixup_pv_table(const void *, unsigned long);
281extern void fixup_smp(const void *, unsigned long);
282
283int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
284 struct module *mod)
285{
286 const Elf_Shdr *s = NULL;
287#ifdef CONFIG_ARM_UNWIND
288 const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
289 const Elf_Shdr *sechdrs_end = sechdrs + hdr->e_shnum;
290 struct mod_unwind_map maps[ARM_SEC_MAX];
291 int i;
292
293 memset(maps, 0, sizeof(maps));
294
295 for (s = sechdrs; s < sechdrs_end; s++) {
296 const char *secname = secstrs + s->sh_name;
297
298 if (!(s->sh_flags & SHF_ALLOC))
299 continue;
300
301 if (strcmp(".ARM.exidx.init.text", secname) == 0)
302 maps[ARM_SEC_INIT].unw_sec = s;
303 else if (strcmp(".ARM.exidx", secname) == 0)
304 maps[ARM_SEC_CORE].unw_sec = s;
305 else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
306 maps[ARM_SEC_EXIT].unw_sec = s;
307 else if (strcmp(".ARM.exidx.text.unlikely", secname) == 0)
308 maps[ARM_SEC_UNLIKELY].unw_sec = s;
309 else if (strcmp(".ARM.exidx.text.hot", secname) == 0)
310 maps[ARM_SEC_HOT].unw_sec = s;
311 else if (strcmp(".init.text", secname) == 0)
312 maps[ARM_SEC_INIT].txt_sec = s;
313 else if (strcmp(".text", secname) == 0)
314 maps[ARM_SEC_CORE].txt_sec = s;
315 else if (strcmp(".exit.text", secname) == 0)
316 maps[ARM_SEC_EXIT].txt_sec = s;
317 else if (strcmp(".text.unlikely", secname) == 0)
318 maps[ARM_SEC_UNLIKELY].txt_sec = s;
319 else if (strcmp(".text.hot", secname) == 0)
320 maps[ARM_SEC_HOT].txt_sec = s;
321 }
322
323 for (i = 0; i < ARM_SEC_MAX; i++)
324 if (maps[i].unw_sec && maps[i].txt_sec)
325 mod->arch.unwind[i] =
326 unwind_table_add(maps[i].unw_sec->sh_addr,
327 maps[i].unw_sec->sh_size,
328 maps[i].txt_sec->sh_addr,
329 maps[i].txt_sec->sh_size);
330#endif
331#ifdef CONFIG_ARM_PATCH_PHYS_VIRT
332 s = find_mod_section(hdr, sechdrs, ".pv_table");
333 if (s)
334 fixup_pv_table((void *)s->sh_addr, s->sh_size);
335#endif
336 s = find_mod_section(hdr, sechdrs, ".alt.smp.init");
337 if (s && !is_smp())
338#ifdef CONFIG_SMP_ON_UP
339 fixup_smp((void *)s->sh_addr, s->sh_size);
340#else
341 return -EINVAL;
342#endif
343 return 0;
344}
345
346void
347module_arch_cleanup(struct module *mod)
348{
349#ifdef CONFIG_ARM_UNWIND
350 int i;
351
352 for (i = 0; i < ARM_SEC_MAX; i++)
353 if (mod->arch.unwind[i])
354 unwind_table_del(mod->arch.unwind[i]);
355#endif
356}
357
