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