11da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 21da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * linux/arch/arm/kernel/module.c 31da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 41da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Copyright (C) 2002 Russell King. 56a570b28b5948e7bf54ea42ec3161bded0a1c460Hyok S. Choi * Modified for nommu by Hyok S. Choi 61da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 71da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * This program is free software; you can redistribute it and/or modify 81da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * it under the terms of the GNU General Public License version 2 as 91da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * published by the Free Software Foundation. 101da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * 111da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * Module allocation method suggested by Andi Kleen. 121da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 131da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/module.h> 14f339ab3d6c59f8f898c165384aa2b6a0ae5d4c1cRussell King#include <linux/moduleloader.h> 151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/kernel.h> 1627ac792ca0b0a1e7e65f20342260650516c95864Andrea Righi#include <linux/mm.h> 171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/elf.h> 181da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/vmalloc.h> 191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/fs.h> 201da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/string.h> 215a0e3ad6af8660be21ca98a971cd00f331318c05Tejun Heo#include <linux/gfp.h> 221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <asm/pgtable.h> 2437efe6427dd50e889473fb3c7fcec02dbbd098ebRussell King#include <asm/sections.h> 254a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King#include <asm/smp_plat.h> 262e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas#include <asm/unwind.h> 27f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks#include <asm/opcodes.h> 281da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 291da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#ifdef CONFIG_XIP_KERNEL 301da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * The XIP kernel text is mapped in the module area for modules and 321da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * some other stuff to work without any indirect relocations. 33ab4f2ee130d5ffcf35616e1f5c6ab75af5b463b6Russell King * MODULES_VADDR is redefined here and not in asm/memory.h to avoid 341da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds * recompiling the whole kernel when CONFIG_XIP_KERNEL is turned on/off. 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds */ 36ab4f2ee130d5ffcf35616e1f5c6ab75af5b463b6Russell King#undef MODULES_VADDR 37e73fc88e19d74fd4dd664cff45b88caab8cde45cCatalin Marinas#define MODULES_VADDR (((unsigned long)_etext + ~PMD_MASK) & PMD_MASK) 381da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#endif 391da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 406a570b28b5948e7bf54ea42ec3161bded0a1c460Hyok S. Choi#ifdef CONFIG_MMU 411da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid *module_alloc(unsigned long size) 421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 43d0a21265dfb5fa8ae54e90d0fb6d1c215b10a28aDavid Rientjes return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END, 4440c3baa7c66f1352521378ee83509fb8f4c465deJianguo Wu GFP_KERNEL, PAGE_KERNEL_EXEC, NUMA_NO_NODE, 45d0a21265dfb5fa8ae54e90d0fb6d1c215b10a28aDavid Rientjes __builtin_return_address(0)); 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 4766574cc05438dd0907029075d7e6ec5ac0036fbcJonas Bonn#endif 481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint 501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsapply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, 511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int relindex, struct module *module) 521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Elf32_Shdr *symsec = sechdrs + symindex; 541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Elf32_Shdr *relsec = sechdrs + relindex; 551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; 561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Elf32_Rel *rel = (void *)relsec->sh_addr; 571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned int i; 581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { 601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long loc; 611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds Elf32_Sym *sym; 6268e6fad488ef21335529c65ca6c88c38be50cd3aRussell King const char *symname; 631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds s32 offset; 64f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks u32 tmp; 65b749315601b44a63634d1a38fd167b8cac0e9ad4Catalin Marinas#ifdef CONFIG_THUMB2_KERNEL 66adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas u32 upper, lower, sign, j1, j2; 67b749315601b44a63634d1a38fd167b8cac0e9ad4Catalin Marinas#endif 681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offset = ELF32_R_SYM(rel->r_info); 701da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (offset < 0 || offset > (symsec->sh_size / sizeof(Elf32_Sym))) { 7168e6fad488ef21335529c65ca6c88c38be50cd3aRussell King pr_err("%s: section %u reloc %u: bad relocation sym offset\n", 721da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module->name, relindex, i); 731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOEXEC; 741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds sym = ((Elf32_Sym *)symsec->sh_addr) + offset; 7768e6fad488ef21335529c65ca6c88c38be50cd3aRussell King symname = strtab + sym->st_name; 781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (rel->r_offset < 0 || rel->r_offset > dstsec->sh_size - sizeof(u32)) { 8068e6fad488ef21335529c65ca6c88c38be50cd3aRussell King pr_err("%s: section %u reloc %u sym '%s': out of bounds relocation, offset %d size %u\n", 8168e6fad488ef21335529c65ca6c88c38be50cd3aRussell King module->name, relindex, i, symname, 8268e6fad488ef21335529c65ca6c88c38be50cd3aRussell King rel->r_offset, dstsec->sh_size); 831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOEXEC; 841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds loc = dstsec->sh_addr + rel->r_offset; 871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds switch (ELF32_R_TYPE(rel->r_info)) { 892e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas case R_ARM_NONE: 902e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas /* ignore */ 912e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas break; 922e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas 931da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case R_ARM_ABS32: 9455f0fb6adb83a5883589e945cbce37e90615ea09Andrey Ryabinin case R_ARM_TARGET1: 951da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds *(u32 *)loc += sym->st_value; 961da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 971da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 981da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds case R_ARM_PC24: 99c2e2611425a956d25d2948c5d95d3848c4db1257Daniel Jacobowitz case R_ARM_CALL: 100c2e2611425a956d25d2948c5d95d3848c4db1257Daniel Jacobowitz case R_ARM_JUMP24: 101f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks offset = __mem_to_opcode_arm(*(u32 *)loc); 102f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks offset = (offset & 0x00ffffff) << 2; 1031da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (offset & 0x02000000) 1041da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offset -= 0x04000000; 1051da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1061da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offset += sym->st_value - loc; 1071da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (offset & 3 || 108c5f125031f416ba6350e84462e9039737b6e2babKevin Welton offset <= (s32)0xfe000000 || 109c5f125031f416ba6350e84462e9039737b6e2babKevin Welton offset >= (s32)0x02000000) { 11068e6fad488ef21335529c65ca6c88c38be50cd3aRussell King pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n", 11168e6fad488ef21335529c65ca6c88c38be50cd3aRussell King module->name, relindex, i, symname, 11268e6fad488ef21335529c65ca6c88c38be50cd3aRussell King ELF32_R_TYPE(rel->r_info), loc, 11368e6fad488ef21335529c65ca6c88c38be50cd3aRussell King sym->st_value); 1141da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOEXEC; 1151da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 1161da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1171da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds offset >>= 2; 118f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks offset &= 0x00ffffff; 1191da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 120f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks *(u32 *)loc &= __opcode_to_mem_arm(0xff000000); 121f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks *(u32 *)loc |= __opcode_to_mem_arm(offset); 1221da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 1231da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 1244731f8b66dd34ebf0e67ca6ba9162b0e509bec06Daniel Silverstone case R_ARM_V4BX: 1254731f8b66dd34ebf0e67ca6ba9162b0e509bec06Daniel Silverstone /* Preserve Rm and the condition code. Alter 1264731f8b66dd34ebf0e67ca6ba9162b0e509bec06Daniel Silverstone * other bits to re-code instruction as 1274731f8b66dd34ebf0e67ca6ba9162b0e509bec06Daniel Silverstone * MOV PC,Rm. 1284731f8b66dd34ebf0e67ca6ba9162b0e509bec06Daniel Silverstone */ 129f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks *(u32 *)loc &= __opcode_to_mem_arm(0xf000000f); 130f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks *(u32 *)loc |= __opcode_to_mem_arm(0x01a0f000); 1314731f8b66dd34ebf0e67ca6ba9162b0e509bec06Daniel Silverstone break; 1324731f8b66dd34ebf0e67ca6ba9162b0e509bec06Daniel Silverstone 1332e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas case R_ARM_PREL31: 1342e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas offset = *(u32 *)loc + sym->st_value - loc; 1352e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas *(u32 *)loc = offset & 0x7fffffff; 1362e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas break; 1372e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas 138ae51e609843f7d0aaeb1c2ad9f89d252a4899885Paul Gortmaker case R_ARM_MOVW_ABS_NC: 139ae51e609843f7d0aaeb1c2ad9f89d252a4899885Paul Gortmaker case R_ARM_MOVT_ABS: 140f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks offset = tmp = __mem_to_opcode_arm(*(u32 *)loc); 141ae51e609843f7d0aaeb1c2ad9f89d252a4899885Paul Gortmaker offset = ((offset & 0xf0000) >> 4) | (offset & 0xfff); 142ae51e609843f7d0aaeb1c2ad9f89d252a4899885Paul Gortmaker offset = (offset ^ 0x8000) - 0x8000; 143ae51e609843f7d0aaeb1c2ad9f89d252a4899885Paul Gortmaker 144ae51e609843f7d0aaeb1c2ad9f89d252a4899885Paul Gortmaker offset += sym->st_value; 145ae51e609843f7d0aaeb1c2ad9f89d252a4899885Paul Gortmaker if (ELF32_R_TYPE(rel->r_info) == R_ARM_MOVT_ABS) 146ae51e609843f7d0aaeb1c2ad9f89d252a4899885Paul Gortmaker offset >>= 16; 147ae51e609843f7d0aaeb1c2ad9f89d252a4899885Paul Gortmaker 148f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks tmp &= 0xfff0f000; 149f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks tmp |= ((offset & 0xf000) << 4) | 150f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks (offset & 0x0fff); 151f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks 152f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks *(u32 *)loc = __opcode_to_mem_arm(tmp); 153ae51e609843f7d0aaeb1c2ad9f89d252a4899885Paul Gortmaker break; 154ae51e609843f7d0aaeb1c2ad9f89d252a4899885Paul Gortmaker 155b749315601b44a63634d1a38fd167b8cac0e9ad4Catalin Marinas#ifdef CONFIG_THUMB2_KERNEL 156adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas case R_ARM_THM_CALL: 157adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas case R_ARM_THM_JUMP24: 158f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks upper = __mem_to_opcode_thumb16(*(u16 *)loc); 159f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2)); 160adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas 161adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas /* 162adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas * 25 bit signed address range (Thumb-2 BL and B.W 163adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas * instructions): 164adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas * S:I1:I2:imm10:imm11:0 165adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas * where: 166adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas * S = upper[10] = offset[24] 167adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas * I1 = ~(J1 ^ S) = offset[23] 168adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas * I2 = ~(J2 ^ S) = offset[22] 169adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas * imm10 = upper[9:0] = offset[21:12] 170adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas * imm11 = lower[10:0] = offset[11:1] 171adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas * J1 = lower[13] 172adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas * J2 = lower[11] 173adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas */ 174adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas sign = (upper >> 10) & 1; 175adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas j1 = (lower >> 13) & 1; 176adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas j2 = (lower >> 11) & 1; 177adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas offset = (sign << 24) | ((~(j1 ^ sign) & 1) << 23) | 178adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas ((~(j2 ^ sign) & 1) << 22) | 179adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas ((upper & 0x03ff) << 12) | 180adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas ((lower & 0x07ff) << 1); 181adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas if (offset & 0x01000000) 182adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas offset -= 0x02000000; 183adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas offset += sym->st_value - loc; 184adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas 1859a00318eadbb43db4e9c163c262a22a3c8b5a672Dave Martin /* 1869a00318eadbb43db4e9c163c262a22a3c8b5a672Dave Martin * For function symbols, only Thumb addresses are 1879a00318eadbb43db4e9c163c262a22a3c8b5a672Dave Martin * allowed (no interworking). 1889a00318eadbb43db4e9c163c262a22a3c8b5a672Dave Martin * 1899a00318eadbb43db4e9c163c262a22a3c8b5a672Dave Martin * For non-function symbols, the destination 1909a00318eadbb43db4e9c163c262a22a3c8b5a672Dave Martin * has no specific ARM/Thumb disposition, so 1919a00318eadbb43db4e9c163c262a22a3c8b5a672Dave Martin * the branch is resolved under the assumption 1929a00318eadbb43db4e9c163c262a22a3c8b5a672Dave Martin * that interworking is not required. 1939a00318eadbb43db4e9c163c262a22a3c8b5a672Dave Martin */ 1949a00318eadbb43db4e9c163c262a22a3c8b5a672Dave Martin if ((ELF32_ST_TYPE(sym->st_info) == STT_FUNC && 1959a00318eadbb43db4e9c163c262a22a3c8b5a672Dave Martin !(offset & 1)) || 196adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas offset <= (s32)0xff000000 || 197adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas offset >= (s32)0x01000000) { 19868e6fad488ef21335529c65ca6c88c38be50cd3aRussell King pr_err("%s: section %u reloc %u sym '%s': relocation %u out of range (%#lx -> %#x)\n", 19968e6fad488ef21335529c65ca6c88c38be50cd3aRussell King module->name, relindex, i, symname, 20068e6fad488ef21335529c65ca6c88c38be50cd3aRussell King ELF32_R_TYPE(rel->r_info), loc, 20168e6fad488ef21335529c65ca6c88c38be50cd3aRussell King sym->st_value); 202adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas return -ENOEXEC; 203adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas } 204adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas 205adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas sign = (offset >> 24) & 1; 206adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas j1 = sign ^ (~(offset >> 23) & 1); 207adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas j2 = sign ^ (~(offset >> 22) & 1); 208f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks upper = (u16)((upper & 0xf800) | (sign << 10) | 209adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas ((offset >> 12) & 0x03ff)); 210f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks lower = (u16)((lower & 0xd000) | 211f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks (j1 << 13) | (j2 << 11) | 212f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks ((offset >> 1) & 0x07ff)); 213f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks 214f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks *(u16 *)loc = __opcode_to_mem_thumb16(upper); 215f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower); 216adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas break; 217adca6dc23bc620ea95392659625200a252b97be3Catalin Marinas 2188dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas case R_ARM_THM_MOVW_ABS_NC: 2198dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas case R_ARM_THM_MOVT_ABS: 220f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks upper = __mem_to_opcode_thumb16(*(u16 *)loc); 221f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks lower = __mem_to_opcode_thumb16(*(u16 *)(loc + 2)); 2228dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas 2238dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas /* 2248dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas * MOVT/MOVW instructions encoding in Thumb-2: 2258dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas * 2268dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas * i = upper[10] 2278dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas * imm4 = upper[3:0] 2288dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas * imm3 = lower[14:12] 2298dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas * imm8 = lower[7:0] 2308dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas * 2318dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas * imm16 = imm4:i:imm3:imm8 2328dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas */ 2338dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas offset = ((upper & 0x000f) << 12) | 2348dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas ((upper & 0x0400) << 1) | 2358dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas ((lower & 0x7000) >> 4) | (lower & 0x00ff); 2368dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas offset = (offset ^ 0x8000) - 0x8000; 2378dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas offset += sym->st_value; 2388dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas 2398dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas if (ELF32_R_TYPE(rel->r_info) == R_ARM_THM_MOVT_ABS) 2408dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas offset >>= 16; 2418dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas 242f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks upper = (u16)((upper & 0xfbf0) | 243f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks ((offset & 0xf000) >> 12) | 244f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks ((offset & 0x0800) >> 1)); 245f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks lower = (u16)((lower & 0x8f00) | 246f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks ((offset & 0x0700) << 4) | 247f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks (offset & 0x00ff)); 248f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks *(u16 *)loc = __opcode_to_mem_thumb16(upper); 249f592d323bc2353db871d1e840f05b27e0730fb10Ben Dooks *(u16 *)(loc + 2) = __opcode_to_mem_thumb16(lower); 2508dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas break; 251b749315601b44a63634d1a38fd167b8cac0e9ad4Catalin Marinas#endif 2528dd47741d191400c46173ed9fba9d14b4033ce23Catalin Marinas 2531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds default: 2541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds printk(KERN_ERR "%s: unknown relocation: %u\n", 2551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds module->name, ELF32_R_TYPE(rel->r_info)); 2561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return -ENOEXEC; 2571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 2591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 2601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 2611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 2628931360eb9c6ec8bd30efef579cef81917a2fcf3Russell Kingstruct mod_unwind_map { 2638931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King const Elf_Shdr *unw_sec; 2648931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King const Elf_Shdr *txt_sec; 2658931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King}; 2668931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King 2674a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell Kingstatic const Elf_Shdr *find_mod_section(const Elf32_Ehdr *hdr, 2684a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King const Elf_Shdr *sechdrs, const char *name) 2694a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King{ 2704a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King const Elf_Shdr *s, *se; 2714a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 2724a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King 2734a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King for (s = sechdrs, se = sechdrs + hdr->e_shnum; s < se; s++) 2744a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King if (strcmp(name, secstrs + s->sh_name) == 0) 2754a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King return s; 2764a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King 2774a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King return NULL; 2784a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King} 2794a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King 280dc21af99fadcfa0ae65b52fd0895f85824f0c288Russell Kingextern void fixup_pv_table(const void *, unsigned long); 2814a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell Kingextern void fixup_smp(const void *, unsigned long); 2824a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King 2838931360eb9c6ec8bd30efef579cef81917a2fcf3Russell Kingint module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, 2848931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King struct module *mod) 2852e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas{ 286dc21af99fadcfa0ae65b52fd0895f85824f0c288Russell King const Elf_Shdr *s = NULL; 2878931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King#ifdef CONFIG_ARM_UNWIND 2888931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King const char *secstrs = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 2894a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King const Elf_Shdr *sechdrs_end = sechdrs + hdr->e_shnum; 2908931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King struct mod_unwind_map maps[ARM_SEC_MAX]; 291e5f7772eec3ec342ecfe686ab8330ef538af134bPhil Carmody int i; 2928931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King 2938931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King memset(maps, 0, sizeof(maps)); 2948931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King 2958931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King for (s = sechdrs; s < sechdrs_end; s++) { 2968931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King const char *secname = secstrs + s->sh_name; 2978931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King 29850005a8deb38e5e6456ebd94e57adb321d4589deRussell King if (!(s->sh_flags & SHF_ALLOC)) 29950005a8deb38e5e6456ebd94e57adb321d4589deRussell King continue; 30050005a8deb38e5e6456ebd94e57adb321d4589deRussell King 3018931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King if (strcmp(".ARM.exidx.init.text", secname) == 0) 3028931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King maps[ARM_SEC_INIT].unw_sec = s; 3038931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King else if (strcmp(".ARM.exidx", secname) == 0) 3048931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King maps[ARM_SEC_CORE].unw_sec = s; 3058931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King else if (strcmp(".ARM.exidx.exit.text", secname) == 0) 3068931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King maps[ARM_SEC_EXIT].unw_sec = s; 307849b882b52df0f276d9ffded01d85654aa0da422Douglas Anderson else if (strcmp(".ARM.exidx.text.unlikely", secname) == 0) 308849b882b52df0f276d9ffded01d85654aa0da422Douglas Anderson maps[ARM_SEC_UNLIKELY].unw_sec = s; 309849b882b52df0f276d9ffded01d85654aa0da422Douglas Anderson else if (strcmp(".ARM.exidx.text.hot", secname) == 0) 310849b882b52df0f276d9ffded01d85654aa0da422Douglas Anderson maps[ARM_SEC_HOT].unw_sec = s; 3118931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King else if (strcmp(".init.text", secname) == 0) 3128931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King maps[ARM_SEC_INIT].txt_sec = s; 3138931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King else if (strcmp(".text", secname) == 0) 3148931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King maps[ARM_SEC_CORE].txt_sec = s; 3158931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King else if (strcmp(".exit.text", secname) == 0) 3168931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King maps[ARM_SEC_EXIT].txt_sec = s; 317849b882b52df0f276d9ffded01d85654aa0da422Douglas Anderson else if (strcmp(".text.unlikely", secname) == 0) 318849b882b52df0f276d9ffded01d85654aa0da422Douglas Anderson maps[ARM_SEC_UNLIKELY].txt_sec = s; 319849b882b52df0f276d9ffded01d85654aa0da422Douglas Anderson else if (strcmp(".text.hot", secname) == 0) 320849b882b52df0f276d9ffded01d85654aa0da422Douglas Anderson maps[ARM_SEC_HOT].txt_sec = s; 321e5f7772eec3ec342ecfe686ab8330ef538af134bPhil Carmody } 3222e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas 3238931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King for (i = 0; i < ARM_SEC_MAX; i++) 3248931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King if (maps[i].unw_sec && maps[i].txt_sec) 3258931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King mod->arch.unwind[i] = 3268931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King unwind_table_add(maps[i].unw_sec->sh_addr, 3278931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King maps[i].unw_sec->sh_size, 3288931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King maps[i].txt_sec->sh_addr, 3298931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King maps[i].txt_sec->sh_size); 3302e1926e7b5d39eb31880152d636e8d8d011888cbCatalin Marinas#endif 331dc21af99fadcfa0ae65b52fd0895f85824f0c288Russell King#ifdef CONFIG_ARM_PATCH_PHYS_VIRT 332dc21af99fadcfa0ae65b52fd0895f85824f0c288Russell King s = find_mod_section(hdr, sechdrs, ".pv_table"); 333dc21af99fadcfa0ae65b52fd0895f85824f0c288Russell King if (s) 334dc21af99fadcfa0ae65b52fd0895f85824f0c288Russell King fixup_pv_table((void *)s->sh_addr, s->sh_size); 335dc21af99fadcfa0ae65b52fd0895f85824f0c288Russell King#endif 3364a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King s = find_mod_section(hdr, sechdrs, ".alt.smp.init"); 3374a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King if (s && !is_smp()) 33820feaab0323cc062b298c12e77869424df05f31fRussell King#ifdef CONFIG_SMP_ON_UP 3394a9cb360197684a861bc06f06d33d5fcc8ffcbf5Russell King fixup_smp((void *)s->sh_addr, s->sh_size); 34020feaab0323cc062b298c12e77869424df05f31fRussell King#else 34120feaab0323cc062b298c12e77869424df05f31fRussell King return -EINVAL; 34220feaab0323cc062b298c12e77869424df05f31fRussell King#endif 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsmodule_arch_cleanup(struct module *mod) 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3498931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King#ifdef CONFIG_ARM_UNWIND 3508931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King int i; 3518931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King 3528931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King for (i = 0; i < ARM_SEC_MAX; i++) 3538931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King if (mod->arch.unwind[i]) 3548931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King unwind_table_del(mod->arch.unwind[i]); 3558931360eb9c6ec8bd30efef579cef81917a2fcf3Russell King#endif 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 357