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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// 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/pgtable.h>
21#include <asm/sections.h>
22#include <asm/smp_plat.h>
23#include <asm/unwind.h>
24#include <asm/opcodes.h>
25
26#ifdef CONFIG_XIP_KERNEL
27/*
28 * The XIP kernel text is mapped in the module area for modules and
29 * some other stuff to work without any indirect relocations.
30 * MODULES_VADDR is redefined here and not in asm/memory.h to avoid
31 * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off.
32 */
33#undef MODULES_VADDR
34#define MODULES_VADDR (((unsigned long)_exiprom + ~PMD_MASK) & PMD_MASK)
35#endif
36
37#ifdef CONFIG_MMU
38void *module_alloc(unsigned long size)
39{
40 gfp_t gfp_mask = GFP_KERNEL;
41 void *p;
42
43 /* Silence the initial allocation */
44 if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS))
45 gfp_mask |= __GFP_NOWARN;
46
47 p = __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
48 gfp_mask, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
49 __builtin_return_address(0));
50 if (!IS_ENABLED(CONFIG_ARM_MODULE_PLTS) || p)
51 return p;
52 return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END,
53 GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
54 __builtin_return_address(0));
55}
56#endif
57
58bool module_exit_section(const char *name)
59{
60 return strstarts(name, ".exit") ||
61 strstarts(name, ".ARM.extab.exit") ||
62 strstarts(name, ".ARM.exidx.exit");
63}
64
65int
66apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
67 unsigned int relindex, struct module *module)
68{
69 Elf32_Shdr *symsec = sechdrs + symindex;
70 Elf32_Shdr *relsec = sechdrs + relindex;
71 Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
72 Elf32_Rel *rel = (void *)relsec->sh_addr;
73 unsigned int i;
74
75 for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
76 unsigned long loc;
77 Elf32_Sym *sym;
78 const char *symname;
79 s32 offset;
80 u32 tmp;
81#ifdef CONFIG_THUMB2_KERNEL
82 u32 upper, lower, sign, j1, j2;
83#endif
84
85 offset = ELF32_R_SYM(rel->r_info);
86 if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) {
87 pr_err("%s: section %u reloc %u: bad relocation sym offset\n",
88 module->name, relindex, i);
89 return -ENOEXEC;
90 }
91
92 sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
93 symname = strtab + sym->st_name;
94
95 if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) {
96 pr_err("%s: section %u reloc %u sym '%s': out of bounds relocation, offset %d size %u\n",
97 module->name, relindex, i, symname,
98 rel->r_offset, dstsec->sh_size);
99 return -ENOEXEC;
100 }
101
102 loc = dstsec->sh_addr + rel->r_offset;
103
104 switch (ELF32_R_TYPE(rel->r_info)) {
105 case R_ARM_NONE:
106 /* ignore */
107 break;
108
109 case R_ARM_ABS32:
110 case R_ARM_TARGET1:
111 *(u32 *)loc += sym->st_value;
112 break;
113
114 case R_ARM_PC24:
115 case R_ARM_CALL:
116 case R_ARM_JUMP24:
117 if (sym->st_value & 3) {
118 pr_err("%s: section %u reloc %u sym '%s': unsupported interworking call (ARM -> Thumb)\n",
119 module->name, relindex, i, symname);
120 return -ENOEXEC;
121 }
122
123 offset = __mem_to_opcode_arm(*(u32 *)loc);
124 offset = (offset & 0x00ffffff) << 2;
125 if (offset & 0x02000000)
126 offset -= 0x04000000;
127
128 offset += sym->st_value - loc;
129
130 /*
131 * Route through a PLT entry if 'offset' exceeds the
132 * supported range. Note that 'offset + loc + 8'
133 * contains the absolute jump target, i.e.,
134 * @sym + addend, corrected for the +8 PC bias.
135 */
136 if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS) &&
137 (offset <= (s32)0xfe000000 ||
138 offset >= (s32)0x02000000))
139 offset = get_module_plt(module, loc,
140 offset + loc + 8)
141 - loc - 8;
142
143 if (offset <= (s32)0xfe000000 ||
144 offset >= (s32)0x02000000) {
145 pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
146 module->name, relindex, i, symname,
147 ELF32_R_TYPE(rel->r_info), loc,
148 sym->st_value);
149 return -ENOEXEC;
150 }
151
152 offset >>= 2;
153 offset &= 0x00ffffff;
154
155 *(u32 *)loc &= __opcode_to_mem_arm(0xff000000);
156 *(u32 *)loc |= __opcode_to_mem_arm(offset);
157 break;
158
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 &= __opcode_to_mem_arm(0xf000000f);
165 *(u32 *)loc |= __opcode_to_mem_arm(0x01a0f000);
166 break;
167
168 case R_ARM_PREL31:
169 offset = (*(s32 *)loc << 1) >> 1; /* sign extend */
170 offset += sym->st_value - loc;
171 if (offset >= 0x40000000 || offset < -0x40000000) {
172 pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
173 module->name, relindex, i, symname,
174 ELF32_R_TYPE(rel->r_info), loc,
175 sym->st_value);
176 return -ENOEXEC;
177 }
178 *(u32 *)loc &= 0x80000000;
179 *(u32 *)loc |= offset & 0x7fffffff;
180 break;
181
182 case R_ARM_MOVW_ABS_NC:
183 case R_ARM_MOVT_ABS:
184 offset = tmp = __mem_to_opcode_arm(*(u32 *)loc);
185 offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff);
186 offset = (offset ^ 0x8000) - 0x8000;
187
188 offset += sym->st_value;
189 if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS)
190 offset >>= 16;
191
192 tmp &= 0xfff0f000;
193 tmp |= ((offset & 0xf000) << 4) |
194 (offset & 0x0fff);
195
196 *(u32 *)loc = __opcode_to_mem_arm(tmp);
197 break;
198
199#ifdef CONFIG_THUMB2_KERNEL
200 case R_ARM_THM_CALL:
201 case R_ARM_THM_JUMP24:
202 /*
203 * For function symbols, only Thumb addresses are
204 * allowed (no interworking).
205 *
206 * For non-function symbols, the destination
207 * has no specific ARM/Thumb disposition, so
208 * the branch is resolved under the assumption
209 * that interworking is not required.
210 */
211 if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC &&
212 !(sym->st_value & 1)) {
213 pr_err("%s: section %u reloc %u sym '%s': unsupported interworking call (Thumb -> ARM)\n",
214 module->name, relindex, i, symname);
215 return -ENOEXEC;
216 }
217
218 upper = __mem_to_opcode_thumb16(*(u16 *)loc);
219 lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2));
220
221 /*
222 * 25 bit signed address range (Thumb-2 BL and B.W
223 * instructions):
224 * S:I1:I2:imm10:imm11:0
225 * where:
226 * S = upper[10] = offset[24]
227 * I1 = ~(J1 ^ S) = offset[23]
228 * I2 = ~(J2 ^ S) = offset[22]
229 * imm10 = upper[9:0] = offset[21:12]
230 * imm11 = lower[10:0] = offset[11:1]
231 * J1 = lower[13]
232 * J2 = lower[11]
233 */
234 sign = (upper >> 10) & 1;
235 j1 = (lower >> 13) & 1;
236 j2 = (lower >> 11) & 1;
237 offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) |
238 ((~(j2 ^ sign) & 1) << 22) |
239 ((upper & 0x03ff) << 12) |
240 ((lower & 0x07ff) << 1);
241 if (offset & 0x01000000)
242 offset -= 0x02000000;
243 offset += sym->st_value - loc;
244
245 /*
246 * Route through a PLT entry if 'offset' exceeds the
247 * supported range.
248 */
249 if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS) &&
250 (offset <= (s32)0xff000000 ||
251 offset >= (s32)0x01000000))
252 offset = get_module_plt(module, loc,
253 offset + loc + 4)
254 - loc - 4;
255
256 if (offset <= (s32)0xff000000 ||
257 offset >= (s32)0x01000000) {
258 pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n",
259 module->name, relindex, i, symname,
260 ELF32_R_TYPE(rel->r_info), loc,
261 sym->st_value);
262 return -ENOEXEC;
263 }
264
265 sign = (offset >> 24) & 1;
266 j1 = sign ^ (~(offset >> 23) & 1);
267 j2 = sign ^ (~(offset >> 22) & 1);
268 upper = (u16)((upper & 0xf800) | (sign << 10) |
269 ((offset >> 12) & 0x03ff));
270 lower = (u16)((lower & 0xd000) |
271 (j1 << 13) | (j2 << 11) |
272 ((offset >> 1) & 0x07ff));
273
274 *(u16 *)loc = __opcode_to_mem_thumb16(upper);
275 *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower);
276 break;
277
278 case R_ARM_THM_MOVW_ABS_NC:
279 case R_ARM_THM_MOVT_ABS:
280 upper = __mem_to_opcode_thumb16(*(u16 *)loc);
281 lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2));
282
283 /*
284 * MOVT/MOVW instructions encoding in Thumb-2:
285 *
286 * i = upper[10]
287 * imm4 = upper[3:0]
288 * imm3 = lower[14:12]
289 * imm8 = lower[7:0]
290 *
291 * imm16 = imm4:i:imm3:imm8
292 */
293 offset = ((upper & 0x000f) << 12) |
294 ((upper & 0x0400) << 1) |
295 ((lower & 0x7000) >> 4) | (lower & 0x00ff);
296 offset = (offset ^ 0x8000) - 0x8000;
297 offset += sym->st_value;
298
299 if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS)
300 offset >>= 16;
301
302 upper = (u16)((upper & 0xfbf0) |
303 ((offset & 0xf000) >> 12) |
304 ((offset & 0x0800) >> 1));
305 lower = (u16)((lower & 0x8f00) |
306 ((offset & 0x0700) << 4) |
307 (offset & 0x00ff));
308 *(u16 *)loc = __opcode_to_mem_thumb16(upper);
309 *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower);
310 break;
311#endif
312
313 default:
314 pr_err("%s: unknown relocation: %u\n",
315 module->name, ELF32_R_TYPE(rel->r_info));
316 return -ENOEXEC;
317 }
318 }
319 return 0;
320}
321
322struct mod_unwind_map {
323 const Elf_Shdr *unw_sec;
324 const Elf_Shdr *txt_sec;
325};
326
327static const Elf_Shdr *find_mod_section(const Elf32_Ehdr *hdr,
328 const Elf_Shdr *sechdrs, const char *name)
329{
330 const Elf_Shdr *s, *se;
331 const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
332
333 for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++)
334 if (strcmp(name, secstrs + s->sh_name) == 0)
335 return s;
336
337 return NULL;
338}
339
340extern void fixup_pv_table(const void *, unsigned long);
341extern void fixup_smp(const void *, unsigned long);
342
343int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
344 struct module *mod)
345{
346 const Elf_Shdr *s = NULL;
347#ifdef CONFIG_ARM_UNWIND
348 const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;
349 const Elf_Shdr *sechdrs_end = sechdrs + hdr->e_shnum;
350 struct mod_unwind_map maps[ARM_SEC_MAX];
351 int i;
352
353 memset(maps, 0, sizeof(maps));
354
355 for (s = sechdrs; s < sechdrs_end; s++) {
356 const char *secname = secstrs + s->sh_name;
357
358 if (!(s->sh_flags & SHF_ALLOC))
359 continue;
360
361 if (strcmp(".ARM.exidx.init.text", secname) == 0)
362 maps[ARM_SEC_INIT].unw_sec = s;
363 else if (strcmp(".ARM.exidx", secname) == 0)
364 maps[ARM_SEC_CORE].unw_sec = s;
365 else if (strcmp(".ARM.exidx.exit.text", secname) == 0)
366 maps[ARM_SEC_EXIT].unw_sec = s;
367 else if (strcmp(".ARM.exidx.text.unlikely", secname) == 0)
368 maps[ARM_SEC_UNLIKELY].unw_sec = s;
369 else if (strcmp(".ARM.exidx.text.hot", secname) == 0)
370 maps[ARM_SEC_HOT].unw_sec = s;
371 else if (strcmp(".init.text", secname) == 0)
372 maps[ARM_SEC_INIT].txt_sec = s;
373 else if (strcmp(".text", secname) == 0)
374 maps[ARM_SEC_CORE].txt_sec = s;
375 else if (strcmp(".exit.text", secname) == 0)
376 maps[ARM_SEC_EXIT].txt_sec = s;
377 else if (strcmp(".text.unlikely", secname) == 0)
378 maps[ARM_SEC_UNLIKELY].txt_sec = s;
379 else if (strcmp(".text.hot", secname) == 0)
380 maps[ARM_SEC_HOT].txt_sec = s;
381 }
382
383 for (i = 0; i < ARM_SEC_MAX; i++)
384 if (maps[i].unw_sec && maps[i].txt_sec)
385 mod->arch.unwind[i] =
386 unwind_table_add(maps[i].unw_sec->sh_addr,
387 maps[i].unw_sec->sh_size,
388 maps[i].txt_sec->sh_addr,
389 maps[i].txt_sec->sh_size);
390#endif
391#ifdef CONFIG_ARM_PATCH_PHYS_VIRT
392 s = find_mod_section(hdr, sechdrs, ".pv_table");
393 if (s)
394 fixup_pv_table((void *)s->sh_addr, s->sh_size);
395#endif
396 s = find_mod_section(hdr, sechdrs, ".alt.smp.init");
397 if (s && !is_smp())
398#ifdef CONFIG_SMP_ON_UP
399 fixup_smp((void *)s->sh_addr, s->sh_size);
400#else
401 return -EINVAL;
402#endif
403 return 0;
404}
405
406void
407module_arch_cleanup(struct module *mod)
408{
409#ifdef CONFIG_ARM_UNWIND
410 int i;
411
412 for (i = 0; i < ARM_SEC_MAX; i++)
413 if (mod->arch.unwind[i])
414 unwind_table_del(mod->arch.unwind[i]);
415#endif
416}