Thomas Gleixner | d2912cb | 2019-06-04 10:11:33 +0200 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * linux/arch/arm/kernel/module.c |
| 4 | * |
| 5 | * Copyright (C) 2002 Russell King. |
Hyok S. Choi | 6a570b2 | 2006-09-26 17:37:07 +0900 | [diff] [blame] | 6 | * Modified for nommu by Hyok S. Choi |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * Module allocation method suggested by Andi Kleen. |
| 9 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/module.h> |
Russell King | f339ab3 | 2005-10-28 14:29:43 +0100 | [diff] [blame] | 11 | #include <linux/moduleloader.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/kernel.h> |
Andrea Righi | 27ac792 | 2008-07-23 21:28:13 -0700 | [diff] [blame] | 13 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #include <linux/elf.h> |
| 15 | #include <linux/vmalloc.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/fs.h> |
| 17 | #include <linux/string.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 18 | #include <linux/gfp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
Russell King | 37efe64 | 2008-12-01 11:53:07 +0000 | [diff] [blame] | 20 | #include <asm/sections.h> |
Russell King | 4a9cb36 | 2011-02-10 15:25:18 +0000 | [diff] [blame] | 21 | #include <asm/smp_plat.h> |
Catalin Marinas | 2e1926e | 2009-02-11 13:09:54 +0100 | [diff] [blame] | 22 | #include <asm/unwind.h> |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 23 | #include <asm/opcodes.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #ifdef CONFIG_XIP_KERNEL |
| 26 | /* |
| 27 | * The XIP kernel text is mapped in the module area for modules and |
| 28 | * some other stuff to work without any indirect relocations. |
Russell King | ab4f2ee | 2008-11-06 17:11:07 +0000 | [diff] [blame] | 29 | * MODULES_VADDR is redefined here and not in asm/memory.h to avoid |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. |
| 31 | */ |
Russell King | ab4f2ee | 2008-11-06 17:11:07 +0000 | [diff] [blame] | 32 | #undef MODULES_VADDR |
Chris Brandt | 02afa9a | 2016-02-09 19:34:43 +0100 | [diff] [blame] | 33 | #define MODULES_VADDR (((unsigned long)_exiprom + ~PMD_MASK) & PMD_MASK) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #endif |
| 35 | |
Hyok S. Choi | 6a570b2 | 2006-09-26 17:37:07 +0900 | [diff] [blame] | 36 | #ifdef CONFIG_MMU |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | void *module_alloc(unsigned long size) |
| 38 | { |
Florian Fainelli | 75d24d9 | 2017-04-27 11:19:01 -0700 | [diff] [blame] | 39 | gfp_t gfp_mask = GFP_KERNEL; |
| 40 | void *p; |
| 41 | |
| 42 | /* Silence the initial allocation */ |
| 43 | if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS)) |
| 44 | gfp_mask |= __GFP_NOWARN; |
| 45 | |
| 46 | p = __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, |
| 47 | gfp_mask, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE, |
Ard Biesheuvel | 7d485f6 | 2014-11-24 16:54:35 +0100 | [diff] [blame] | 48 | __builtin_return_address(0)); |
| 49 | if (!IS_ENABLED(CONFIG_ARM_MODULE_PLTS) || p) |
| 50 | return p; |
| 51 | return __vmalloc_node_range(size, 1, VMALLOC_START, VMALLOC_END, |
Andrey Ryabinin | cb9e3c2 | 2015-02-13 14:40:07 -0800 | [diff] [blame] | 52 | GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE, |
David Rientjes | d0a2126 | 2011-01-13 15:46:02 -0800 | [diff] [blame] | 53 | __builtin_return_address(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | } |
Jonas Bonn | 66574cc | 2011-06-30 21:22:12 +0200 | [diff] [blame] | 55 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Vincent Whitchurch | cdcb07e | 2020-05-14 11:36:42 +0100 | [diff] [blame] | 57 | bool module_init_section(const char *name) |
| 58 | { |
| 59 | return strstarts(name, ".init") || |
| 60 | strstarts(name, ".ARM.extab.init") || |
| 61 | strstarts(name, ".ARM.exidx.init"); |
| 62 | } |
| 63 | |
Matthias Schiffer | 70bac08 | 2019-06-07 12:49:12 +0200 | [diff] [blame] | 64 | bool module_exit_section(const char *name) |
| 65 | { |
| 66 | return strstarts(name, ".exit") || |
| 67 | strstarts(name, ".ARM.extab.exit") || |
| 68 | strstarts(name, ".ARM.exidx.exit"); |
| 69 | } |
| 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | int |
| 72 | apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, |
| 73 | unsigned int relindex, struct module *module) |
| 74 | { |
| 75 | Elf32_Shdr *symsec = sechdrs + symindex; |
| 76 | Elf32_Shdr *relsec = sechdrs + relindex; |
| 77 | Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; |
| 78 | Elf32_Rel *rel = (void *)relsec->sh_addr; |
| 79 | unsigned int i; |
| 80 | |
| 81 | for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { |
| 82 | unsigned long loc; |
| 83 | Elf32_Sym *sym; |
Russell King | 68e6fad | 2011-01-11 19:57:14 +0000 | [diff] [blame] | 84 | const char *symname; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | s32 offset; |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 86 | u32 tmp; |
Catalin Marinas | b749315 | 2010-06-21 15:11:38 +0100 | [diff] [blame] | 87 | #ifdef CONFIG_THUMB2_KERNEL |
Catalin Marinas | adca6dc | 2009-07-24 12:32:59 +0100 | [diff] [blame] | 88 | u32 upper, lower, sign, j1, j2; |
Catalin Marinas | b749315 | 2010-06-21 15:11:38 +0100 | [diff] [blame] | 89 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
| 91 | offset = ELF32_R_SYM(rel->r_info); |
| 92 | if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { |
Russell King | 68e6fad | 2011-01-11 19:57:14 +0000 | [diff] [blame] | 93 | pr_err("%s: section %u reloc %u: bad relocation sym offset\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | module->name, relindex, i); |
| 95 | return -ENOEXEC; |
| 96 | } |
| 97 | |
| 98 | sym = ((Elf32_Sym *)symsec->sh_addr) + offset; |
Russell King | 68e6fad | 2011-01-11 19:57:14 +0000 | [diff] [blame] | 99 | symname = strtab + sym->st_name; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | |
| 101 | if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) { |
Russell King | 68e6fad | 2011-01-11 19:57:14 +0000 | [diff] [blame] | 102 | pr_err("%s: section %u reloc %u sym '%s': out of bounds relocation, offset %d size %u\n", |
| 103 | module->name, relindex, i, symname, |
| 104 | rel->r_offset, dstsec->sh_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | return -ENOEXEC; |
| 106 | } |
| 107 | |
| 108 | loc = dstsec->sh_addr + rel->r_offset; |
| 109 | |
| 110 | switch (ELF32_R_TYPE(rel->r_info)) { |
Catalin Marinas | 2e1926e | 2009-02-11 13:09:54 +0100 | [diff] [blame] | 111 | case R_ARM_NONE: |
| 112 | /* ignore */ |
| 113 | break; |
| 114 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | case R_ARM_ABS32: |
Andrey Ryabinin | 55f0fb6 | 2014-08-08 14:12:17 +0100 | [diff] [blame] | 116 | case R_ARM_TARGET1: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 117 | *(u32 *)loc += sym->st_value; |
| 118 | break; |
| 119 | |
| 120 | case R_ARM_PC24: |
Daniel Jacobowitz | c2e2611 | 2005-12-14 22:04:22 +0000 | [diff] [blame] | 121 | case R_ARM_CALL: |
| 122 | case R_ARM_JUMP24: |
Ard Biesheuvel | 2b8514d | 2014-11-24 16:45:12 +0100 | [diff] [blame] | 123 | if (sym->st_value & 3) { |
| 124 | pr_err("%s: section %u reloc %u sym '%s': unsupported interworking call (ARM -> Thumb)\n", |
| 125 | module->name, relindex, i, symname); |
| 126 | return -ENOEXEC; |
| 127 | } |
| 128 | |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 129 | offset = __mem_to_opcode_arm(*(u32 *)loc); |
| 130 | offset = (offset & 0x00ffffff) << 2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | if (offset & 0x02000000) |
| 132 | offset -= 0x04000000; |
| 133 | |
| 134 | offset += sym->st_value - loc; |
Ard Biesheuvel | 7d485f6 | 2014-11-24 16:54:35 +0100 | [diff] [blame] | 135 | |
| 136 | /* |
| 137 | * Route through a PLT entry if 'offset' exceeds the |
| 138 | * supported range. Note that 'offset + loc + 8' |
| 139 | * contains the absolute jump target, i.e., |
| 140 | * @sym + addend, corrected for the +8 PC bias. |
| 141 | */ |
| 142 | if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS) && |
| 143 | (offset <= (s32)0xfe000000 || |
| 144 | offset >= (s32)0x02000000)) |
| 145 | offset = get_module_plt(module, loc, |
| 146 | offset + loc + 8) |
| 147 | - loc - 8; |
| 148 | |
Ard Biesheuvel | 2b8514d | 2014-11-24 16:45:12 +0100 | [diff] [blame] | 149 | if (offset <= (s32)0xfe000000 || |
Kevin Welton | c5f1250 | 2007-05-08 22:05:25 +0100 | [diff] [blame] | 150 | offset >= (s32)0x02000000) { |
Russell King | 68e6fad | 2011-01-11 19:57:14 +0000 | [diff] [blame] | 151 | pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n", |
| 152 | module->name, relindex, i, symname, |
| 153 | ELF32_R_TYPE(rel->r_info), loc, |
| 154 | sym->st_value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | return -ENOEXEC; |
| 156 | } |
| 157 | |
| 158 | offset >>= 2; |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 159 | offset &= 0x00ffffff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 161 | *(u32 *)loc &= __opcode_to_mem_arm(0xff000000); |
| 162 | *(u32 *)loc |= __opcode_to_mem_arm(offset); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | break; |
| 164 | |
Daniel Silverstone | 4731f8b | 2009-03-20 11:11:43 +0100 | [diff] [blame] | 165 | case R_ARM_V4BX: |
| 166 | /* Preserve Rm and the condition code. Alter |
| 167 | * other bits to re-code instruction as |
| 168 | * MOV PC,Rm. |
| 169 | */ |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 170 | *(u32 *)loc &= __opcode_to_mem_arm(0xf000000f); |
| 171 | *(u32 *)loc |= __opcode_to_mem_arm(0x01a0f000); |
Daniel Silverstone | 4731f8b | 2009-03-20 11:11:43 +0100 | [diff] [blame] | 172 | break; |
| 173 | |
Catalin Marinas | 2e1926e | 2009-02-11 13:09:54 +0100 | [diff] [blame] | 174 | case R_ARM_PREL31: |
Ard Biesheuvel | 050d18d | 2017-01-30 18:29:28 +0100 | [diff] [blame] | 175 | offset = (*(s32 *)loc << 1) >> 1; /* sign extend */ |
| 176 | offset += sym->st_value - loc; |
| 177 | if (offset >= 0x40000000 || offset < -0x40000000) { |
| 178 | pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n", |
| 179 | module->name, relindex, i, symname, |
| 180 | ELF32_R_TYPE(rel->r_info), loc, |
| 181 | sym->st_value); |
| 182 | return -ENOEXEC; |
| 183 | } |
| 184 | *(u32 *)loc &= 0x80000000; |
| 185 | *(u32 *)loc |= offset & 0x7fffffff; |
Catalin Marinas | 2e1926e | 2009-02-11 13:09:54 +0100 | [diff] [blame] | 186 | break; |
| 187 | |
Ard Biesheuvel | 22f2d23 | 2020-09-14 11:24:37 +0300 | [diff] [blame] | 188 | case R_ARM_REL32: |
| 189 | *(u32 *)loc += sym->st_value - loc; |
| 190 | break; |
| 191 | |
Paul Gortmaker | ae51e609 | 2009-05-07 16:18:40 +0100 | [diff] [blame] | 192 | case R_ARM_MOVW_ABS_NC: |
| 193 | case R_ARM_MOVT_ABS: |
Ard Biesheuvel | 22f2d23 | 2020-09-14 11:24:37 +0300 | [diff] [blame] | 194 | case R_ARM_MOVW_PREL_NC: |
| 195 | case R_ARM_MOVT_PREL: |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 196 | offset = tmp = __mem_to_opcode_arm(*(u32 *)loc); |
Paul Gortmaker | ae51e609 | 2009-05-07 16:18:40 +0100 | [diff] [blame] | 197 | offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff); |
| 198 | offset = (offset ^ 0x8000) - 0x8000; |
| 199 | |
| 200 | offset += sym->st_value; |
Ard Biesheuvel | 22f2d23 | 2020-09-14 11:24:37 +0300 | [diff] [blame] | 201 | if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_PREL || |
| 202 | ELF32_R_TYPE(rel->r_info) == R_ARM_MOVW_PREL_NC) |
| 203 | offset -= loc; |
| 204 | if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS || |
| 205 | ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_PREL) |
Paul Gortmaker | ae51e609 | 2009-05-07 16:18:40 +0100 | [diff] [blame] | 206 | offset >>= 16; |
| 207 | |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 208 | tmp &= 0xfff0f000; |
| 209 | tmp |= ((offset & 0xf000) << 4) | |
| 210 | (offset & 0x0fff); |
| 211 | |
| 212 | *(u32 *)loc = __opcode_to_mem_arm(tmp); |
Paul Gortmaker | ae51e609 | 2009-05-07 16:18:40 +0100 | [diff] [blame] | 213 | break; |
| 214 | |
Catalin Marinas | b749315 | 2010-06-21 15:11:38 +0100 | [diff] [blame] | 215 | #ifdef CONFIG_THUMB2_KERNEL |
Catalin Marinas | adca6dc | 2009-07-24 12:32:59 +0100 | [diff] [blame] | 216 | case R_ARM_THM_CALL: |
| 217 | case R_ARM_THM_JUMP24: |
Ard Biesheuvel | 2b8514d | 2014-11-24 16:45:12 +0100 | [diff] [blame] | 218 | /* |
| 219 | * For function symbols, only Thumb addresses are |
| 220 | * allowed (no interworking). |
| 221 | * |
| 222 | * For non-function symbols, the destination |
| 223 | * has no specific ARM/Thumb disposition, so |
| 224 | * the branch is resolved under the assumption |
| 225 | * that interworking is not required. |
| 226 | */ |
| 227 | if (ELF32_ST_TYPE(sym->st_info) == STT_FUNC && |
| 228 | !(sym->st_value & 1)) { |
| 229 | pr_err("%s: section %u reloc %u sym '%s': unsupported interworking call (Thumb -> ARM)\n", |
| 230 | module->name, relindex, i, symname); |
| 231 | return -ENOEXEC; |
| 232 | } |
| 233 | |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 234 | upper = __mem_to_opcode_thumb16(*(u16 *)loc); |
| 235 | lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2)); |
Catalin Marinas | adca6dc | 2009-07-24 12:32:59 +0100 | [diff] [blame] | 236 | |
| 237 | /* |
| 238 | * 25 bit signed address range (Thumb-2 BL and B.W |
| 239 | * instructions): |
| 240 | * S:I1:I2:imm10:imm11:0 |
| 241 | * where: |
| 242 | * S = upper[10] = offset[24] |
| 243 | * I1 = ~(J1 ^ S) = offset[23] |
| 244 | * I2 = ~(J2 ^ S) = offset[22] |
| 245 | * imm10 = upper[9:0] = offset[21:12] |
| 246 | * imm11 = lower[10:0] = offset[11:1] |
| 247 | * J1 = lower[13] |
| 248 | * J2 = lower[11] |
| 249 | */ |
| 250 | sign = (upper >> 10) & 1; |
| 251 | j1 = (lower >> 13) & 1; |
| 252 | j2 = (lower >> 11) & 1; |
| 253 | offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) | |
| 254 | ((~(j2 ^ sign) & 1) << 22) | |
| 255 | ((upper & 0x03ff) << 12) | |
| 256 | ((lower & 0x07ff) << 1); |
| 257 | if (offset & 0x01000000) |
| 258 | offset -= 0x02000000; |
| 259 | offset += sym->st_value - loc; |
| 260 | |
Ard Biesheuvel | 7d485f6 | 2014-11-24 16:54:35 +0100 | [diff] [blame] | 261 | /* |
| 262 | * Route through a PLT entry if 'offset' exceeds the |
| 263 | * supported range. |
| 264 | */ |
| 265 | if (IS_ENABLED(CONFIG_ARM_MODULE_PLTS) && |
| 266 | (offset <= (s32)0xff000000 || |
| 267 | offset >= (s32)0x01000000)) |
| 268 | offset = get_module_plt(module, loc, |
| 269 | offset + loc + 4) |
| 270 | - loc - 4; |
| 271 | |
Ard Biesheuvel | 2b8514d | 2014-11-24 16:45:12 +0100 | [diff] [blame] | 272 | if (offset <= (s32)0xff000000 || |
Catalin Marinas | adca6dc | 2009-07-24 12:32:59 +0100 | [diff] [blame] | 273 | offset >= (s32)0x01000000) { |
Russell King | 68e6fad | 2011-01-11 19:57:14 +0000 | [diff] [blame] | 274 | pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n", |
| 275 | module->name, relindex, i, symname, |
| 276 | ELF32_R_TYPE(rel->r_info), loc, |
| 277 | sym->st_value); |
Catalin Marinas | adca6dc | 2009-07-24 12:32:59 +0100 | [diff] [blame] | 278 | return -ENOEXEC; |
| 279 | } |
| 280 | |
| 281 | sign = (offset >> 24) & 1; |
| 282 | j1 = sign ^ (~(offset >> 23) & 1); |
| 283 | j2 = sign ^ (~(offset >> 22) & 1); |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 284 | upper = (u16)((upper & 0xf800) | (sign << 10) | |
Catalin Marinas | adca6dc | 2009-07-24 12:32:59 +0100 | [diff] [blame] | 285 | ((offset >> 12) & 0x03ff)); |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 286 | lower = (u16)((lower & 0xd000) | |
| 287 | (j1 << 13) | (j2 << 11) | |
| 288 | ((offset >> 1) & 0x07ff)); |
| 289 | |
| 290 | *(u16 *)loc = __opcode_to_mem_thumb16(upper); |
| 291 | *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower); |
Catalin Marinas | adca6dc | 2009-07-24 12:32:59 +0100 | [diff] [blame] | 292 | break; |
| 293 | |
Catalin Marinas | 8dd4774 | 2010-06-21 15:10:37 +0100 | [diff] [blame] | 294 | case R_ARM_THM_MOVW_ABS_NC: |
| 295 | case R_ARM_THM_MOVT_ABS: |
Ard Biesheuvel | 22f2d23 | 2020-09-14 11:24:37 +0300 | [diff] [blame] | 296 | case R_ARM_THM_MOVW_PREL_NC: |
| 297 | case R_ARM_THM_MOVT_PREL: |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 298 | upper = __mem_to_opcode_thumb16(*(u16 *)loc); |
| 299 | lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2)); |
Catalin Marinas | 8dd4774 | 2010-06-21 15:10:37 +0100 | [diff] [blame] | 300 | |
| 301 | /* |
| 302 | * MOVT/MOVW instructions encoding in Thumb-2: |
| 303 | * |
| 304 | * i = upper[10] |
| 305 | * imm4 = upper[3:0] |
| 306 | * imm3 = lower[14:12] |
| 307 | * imm8 = lower[7:0] |
| 308 | * |
| 309 | * imm16 = imm4:i:imm3:imm8 |
| 310 | */ |
| 311 | offset = ((upper & 0x000f) << 12) | |
| 312 | ((upper & 0x0400) << 1) | |
| 313 | ((lower & 0x7000) >> 4) | (lower & 0x00ff); |
| 314 | offset = (offset ^ 0x8000) - 0x8000; |
| 315 | offset += sym->st_value; |
| 316 | |
Ard Biesheuvel | 22f2d23 | 2020-09-14 11:24:37 +0300 | [diff] [blame] | 317 | if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_PREL || |
| 318 | ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVW_PREL_NC) |
| 319 | offset -= loc; |
| 320 | if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS || |
| 321 | ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_PREL) |
Catalin Marinas | 8dd4774 | 2010-06-21 15:10:37 +0100 | [diff] [blame] | 322 | offset >>= 16; |
| 323 | |
Ben Dooks | f592d32 | 2013-07-19 18:27:23 +0100 | [diff] [blame] | 324 | upper = (u16)((upper & 0xfbf0) | |
| 325 | ((offset & 0xf000) >> 12) | |
| 326 | ((offset & 0x0800) >> 1)); |
| 327 | lower = (u16)((lower & 0x8f00) | |
| 328 | ((offset & 0x0700) << 4) | |
| 329 | (offset & 0x00ff)); |
| 330 | *(u16 *)loc = __opcode_to_mem_thumb16(upper); |
| 331 | *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower); |
Catalin Marinas | 8dd4774 | 2010-06-21 15:10:37 +0100 | [diff] [blame] | 332 | break; |
Catalin Marinas | b749315 | 2010-06-21 15:11:38 +0100 | [diff] [blame] | 333 | #endif |
Catalin Marinas | 8dd4774 | 2010-06-21 15:10:37 +0100 | [diff] [blame] | 334 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | default: |
Russell King | 4ed89f2228 | 2014-10-28 11:26:42 +0000 | [diff] [blame] | 336 | pr_err("%s: unknown relocation: %u\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | module->name, ELF32_R_TYPE(rel->r_info)); |
| 338 | return -ENOEXEC; |
| 339 | } |
| 340 | } |
| 341 | return 0; |
| 342 | } |
| 343 | |
Russell King | 8931360 | 2010-11-12 13:02:46 +0000 | [diff] [blame] | 344 | struct mod_unwind_map { |
| 345 | const Elf_Shdr *unw_sec; |
| 346 | const Elf_Shdr *txt_sec; |
| 347 | }; |
| 348 | |
Russell King | 4a9cb36 | 2011-02-10 15:25:18 +0000 | [diff] [blame] | 349 | static const Elf_Shdr *find_mod_section(const Elf32_Ehdr *hdr, |
| 350 | const Elf_Shdr *sechdrs, const char *name) |
| 351 | { |
| 352 | const Elf_Shdr *s, *se; |
| 353 | const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
| 354 | |
| 355 | for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++) |
| 356 | if (strcmp(name, secstrs + s->sh_name) == 0) |
| 357 | return s; |
| 358 | |
| 359 | return NULL; |
| 360 | } |
| 361 | |
Russell King | dc21af9 | 2011-01-04 19:09:43 +0000 | [diff] [blame] | 362 | extern void fixup_pv_table(const void *, unsigned long); |
Russell King | 4a9cb36 | 2011-02-10 15:25:18 +0000 | [diff] [blame] | 363 | extern void fixup_smp(const void *, unsigned long); |
| 364 | |
Russell King | 8931360 | 2010-11-12 13:02:46 +0000 | [diff] [blame] | 365 | int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, |
| 366 | struct module *mod) |
| 367 | { |
Russell King | dc21af9 | 2011-01-04 19:09:43 +0000 | [diff] [blame] | 368 | const Elf_Shdr *s = NULL; |
Catalin Marinas | 2e1926e | 2009-02-11 13:09:54 +0100 | [diff] [blame] | 369 | #ifdef CONFIG_ARM_UNWIND |
Russell King | 8931360 | 2010-11-12 13:02:46 +0000 | [diff] [blame] | 370 | const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; |
Russell King | 4a9cb36 | 2011-02-10 15:25:18 +0000 | [diff] [blame] | 371 | const Elf_Shdr *sechdrs_end = sechdrs + hdr->e_shnum; |
Russell King | 8931360 | 2010-11-12 13:02:46 +0000 | [diff] [blame] | 372 | struct mod_unwind_map maps[ARM_SEC_MAX]; |
Phil Carmody | e5f7772 | 2010-08-19 15:16:37 +0100 | [diff] [blame] | 373 | int i; |
Russell King | 8931360 | 2010-11-12 13:02:46 +0000 | [diff] [blame] | 374 | |
| 375 | memset(maps, 0, sizeof(maps)); |
| 376 | |
| 377 | for (s = sechdrs; s < sechdrs_end; s++) { |
| 378 | const char *secname = secstrs + s->sh_name; |
| 379 | |
Russell King | 50005a8 | 2010-11-12 13:04:16 +0000 | [diff] [blame] | 380 | if (!(s->sh_flags & SHF_ALLOC)) |
| 381 | continue; |
| 382 | |
Russell King | 8931360 | 2010-11-12 13:02:46 +0000 | [diff] [blame] | 383 | if (strcmp(".ARM.exidx.init.text", secname) == 0) |
| 384 | maps[ARM_SEC_INIT].unw_sec = s; |
Russell King | 8931360 | 2010-11-12 13:02:46 +0000 | [diff] [blame] | 385 | else if (strcmp(".ARM.exidx", secname) == 0) |
| 386 | maps[ARM_SEC_CORE].unw_sec = s; |
| 387 | else if (strcmp(".ARM.exidx.exit.text", secname) == 0) |
| 388 | maps[ARM_SEC_EXIT].unw_sec = s; |
Douglas Anderson | 849b882 | 2013-08-29 00:08:01 +0100 | [diff] [blame] | 389 | else if (strcmp(".ARM.exidx.text.unlikely", secname) == 0) |
| 390 | maps[ARM_SEC_UNLIKELY].unw_sec = s; |
| 391 | else if (strcmp(".ARM.exidx.text.hot", secname) == 0) |
| 392 | maps[ARM_SEC_HOT].unw_sec = s; |
Russell King | 8931360 | 2010-11-12 13:02:46 +0000 | [diff] [blame] | 393 | else if (strcmp(".init.text", secname) == 0) |
| 394 | maps[ARM_SEC_INIT].txt_sec = s; |
Russell King | 8931360 | 2010-11-12 13:02:46 +0000 | [diff] [blame] | 395 | else if (strcmp(".text", secname) == 0) |
| 396 | maps[ARM_SEC_CORE].txt_sec = s; |
| 397 | else if (strcmp(".exit.text", secname) == 0) |
| 398 | maps[ARM_SEC_EXIT].txt_sec = s; |
Douglas Anderson | 849b882 | 2013-08-29 00:08:01 +0100 | [diff] [blame] | 399 | else if (strcmp(".text.unlikely", secname) == 0) |
| 400 | maps[ARM_SEC_UNLIKELY].txt_sec = s; |
| 401 | else if (strcmp(".text.hot", secname) == 0) |
| 402 | maps[ARM_SEC_HOT].txt_sec = s; |
Phil Carmody | e5f7772 | 2010-08-19 15:16:37 +0100 | [diff] [blame] | 403 | } |
Catalin Marinas | 2e1926e | 2009-02-11 13:09:54 +0100 | [diff] [blame] | 404 | |
Russell King | 8931360 | 2010-11-12 13:02:46 +0000 | [diff] [blame] | 405 | for (i = 0; i < ARM_SEC_MAX; i++) |
| 406 | if (maps[i].unw_sec && maps[i].txt_sec) |
| 407 | mod->arch.unwind[i] = |
| 408 | unwind_table_add(maps[i].unw_sec->sh_addr, |
| 409 | maps[i].unw_sec->sh_size, |
| 410 | maps[i].txt_sec->sh_addr, |
| 411 | maps[i].txt_sec->sh_size); |
Catalin Marinas | 2e1926e | 2009-02-11 13:09:54 +0100 | [diff] [blame] | 412 | #endif |
Russell King | dc21af9 | 2011-01-04 19:09:43 +0000 | [diff] [blame] | 413 | #ifdef CONFIG_ARM_PATCH_PHYS_VIRT |
| 414 | s = find_mod_section(hdr, sechdrs, ".pv_table"); |
| 415 | if (s) |
| 416 | fixup_pv_table((void *)s->sh_addr, s->sh_size); |
| 417 | #endif |
Russell King | 4a9cb36 | 2011-02-10 15:25:18 +0000 | [diff] [blame] | 418 | s = find_mod_section(hdr, sechdrs, ".alt.smp.init"); |
| 419 | if (s && !is_smp()) |
Russell King | 20feaab | 2011-08-04 00:01:00 +0100 | [diff] [blame] | 420 | #ifdef CONFIG_SMP_ON_UP |
Russell King | 4a9cb36 | 2011-02-10 15:25:18 +0000 | [diff] [blame] | 421 | fixup_smp((void *)s->sh_addr, s->sh_size); |
Russell King | 20feaab | 2011-08-04 00:01:00 +0100 | [diff] [blame] | 422 | #else |
| 423 | return -EINVAL; |
| 424 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | return 0; |
| 426 | } |
| 427 | |
| 428 | void |
| 429 | module_arch_cleanup(struct module *mod) |
| 430 | { |
Russell King | 8931360 | 2010-11-12 13:02:46 +0000 | [diff] [blame] | 431 | #ifdef CONFIG_ARM_UNWIND |
| 432 | int i; |
| 433 | |
Vincent Whitchurch | cdcb07e | 2020-05-14 11:36:42 +0100 | [diff] [blame] | 434 | for (i = 0; i < ARM_SEC_MAX; i++) { |
| 435 | unwind_table_del(mod->arch.unwind[i]); |
| 436 | mod->arch.unwind[i] = NULL; |
| 437 | } |
| 438 | #endif |
| 439 | } |
| 440 | |
| 441 | void __weak module_arch_freeing_init(struct module *mod) |
| 442 | { |
| 443 | #ifdef CONFIG_ARM_UNWIND |
| 444 | unwind_table_del(mod->arch.unwind[ARM_SEC_INIT]); |
| 445 | mod->arch.unwind[ARM_SEC_INIT] = NULL; |
Russell King | 8931360 | 2010-11-12 13:02:46 +0000 | [diff] [blame] | 446 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | } |