14e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer/* 24e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * This program is free software; you can redistribute it and/or modify 34e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * it under the terms of the GNU General Public License as published by 44e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * the Free Software Foundation; either version 2 of the License, or 54e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * (at your option) any later version. 64e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * 74e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * This program is distributed in the hope that it will be useful, 84e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * but WITHOUT ANY WARRANTY; without even the implied warranty of 94e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 104e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * GNU General Public License for more details. 114e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * 124e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * You should have received a copy of the GNU General Public License 134e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * along with this program; if not, write to the Free Software 144e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 154e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * 164e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * Copyright (C) 2001 Rusty Russell. 174e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * Copyright (C) 2003, 2004 Ralf Baechle (ralf@linux-mips.org) 184e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * Copyright (C) 2005 Thiemo Seufer 194e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer */ 204e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 214e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer#undef DEBUG 224e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 234e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer#include <linux/moduleloader.h> 244e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer#include <linux/elf.h> 2527ac792ca0b0a1e7e65f20342260650516c95864Andrea Righi#include <linux/mm.h> 264e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer#include <linux/vmalloc.h> 274e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer#include <linux/slab.h> 284e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer#include <linux/fs.h> 294e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer#include <linux/string.h> 304e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer#include <linux/kernel.h> 311da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds#include <linux/spinlock.h> 3294bb0c1ab293c298a8852e4f10c4215bad6daa9bDavid Daney#include <linux/jump_label.h> 3394bb0c1ab293c298a8852e4f10c4215bad6daa9bDavid Daney 34656be92f9ae194ed62bc81310a4589a7cd765f13Atsushi Nemoto#include <asm/pgtable.h> /* MODULE_START */ 351da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 364e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstruct mips_hi16 { 374e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer struct mips_hi16 *next; 384e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Addr *addr; 394e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Addr value; 404e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer}; 414e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 424e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic struct mips_hi16 *mips_hi16_list; 434e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic LIST_HEAD(dbe_list); 451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsstatic DEFINE_SPINLOCK(dbe_lock); 461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 4766574cc05438dd0907029075d7e6ec5ac0036fbcJonas Bonn#ifdef MODULE_START 484e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufervoid *module_alloc(unsigned long size) 494e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 50d0a21265dfb5fa8ae54e90d0fb6d1c215b10a28aDavid Rientjes return __vmalloc_node_range(size, 1, MODULE_START, MODULE_END, 51d0a21265dfb5fa8ae54e90d0fb6d1c215b10a28aDavid Rientjes GFP_KERNEL, PAGE_KERNEL, -1, 52d0a21265dfb5fa8ae54e90d0fb6d1c215b10a28aDavid Rientjes __builtin_return_address(0)); 534e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 5466574cc05438dd0907029075d7e6ec5ac0036fbcJonas Bonn#endif 554e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 564e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int apply_r_mips_none(struct module *me, u32 *location, Elf_Addr v) 574e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 584e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 594e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 604e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 614e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int apply_r_mips_32_rel(struct module *me, u32 *location, Elf_Addr v) 624e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 634e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer *location += v; 644e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 654e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 664e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 674e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 684e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int apply_r_mips_32_rela(struct module *me, u32 *location, Elf_Addr v) 694e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 704e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer *location = v; 714e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 724e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 734e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 744e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 754e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int apply_r_mips_26_rel(struct module *me, u32 *location, Elf_Addr v) 764e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 774e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer if (v % 4) { 786f9fdeb6761a46ded6bf4b799993a3f235ab853dRalf Baechle pr_err("module %s: dangerous R_MIPS_26 REL relocation\n", 796f9fdeb6761a46ded6bf4b799993a3f235ab853dRalf Baechle me->name); 804e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return -ENOEXEC; 814e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer } 824e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 834e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { 844e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer printk(KERN_ERR 854e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer "module %s: relocation overflow\n", 864e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer me->name); 874e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return -ENOEXEC; 884e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer } 894e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 904e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer *location = (*location & ~0x03ffffff) | 914e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer ((*location + (v >> 2)) & 0x03ffffff); 924e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 934e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 944e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 954e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 964e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int apply_r_mips_26_rela(struct module *me, u32 *location, Elf_Addr v) 974e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 984e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer if (v % 4) { 996f9fdeb6761a46ded6bf4b799993a3f235ab853dRalf Baechle pr_err("module %s: dangerous R_MIPS_26 RELArelocation\n", 1006f9fdeb6761a46ded6bf4b799993a3f235ab853dRalf Baechle me->name); 1014e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return -ENOEXEC; 1024e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer } 1034e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1044e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer if ((v & 0xf0000000) != (((unsigned long)location + 4) & 0xf0000000)) { 1054e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer printk(KERN_ERR 1064e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer "module %s: relocation overflow\n", 1074e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer me->name); 1084e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return -ENOEXEC; 1094e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer } 1104e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1114e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer *location = (*location & ~0x03ffffff) | ((v >> 2) & 0x03ffffff); 1124e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1134e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 1144e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 1154e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1164e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int apply_r_mips_hi16_rel(struct module *me, u32 *location, Elf_Addr v) 1174e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 1184e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer struct mips_hi16 *n; 1194e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1204e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer /* 1214e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * We cannot relocate this one now because we don't know the value of 1224e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * the carry we need to add. Save the information, and let LO16 do the 1234e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * actual relocation. 1244e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer */ 1254e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer n = kmalloc(sizeof *n, GFP_KERNEL); 1264e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer if (!n) 1274e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return -ENOMEM; 1284e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1294e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer n->addr = (Elf_Addr *)location; 1304e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer n->value = v; 1314e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer n->next = mips_hi16_list; 1324e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer mips_hi16_list = n; 1334e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1344e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 1354e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 1364e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1374e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int apply_r_mips_hi16_rela(struct module *me, u32 *location, Elf_Addr v) 1384e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 1394e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer *location = (*location & 0xffff0000) | 1404e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer ((((long long) v + 0x8000LL) >> 16) & 0xffff); 1414e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1424e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 1434e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 1444e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1454e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int apply_r_mips_lo16_rel(struct module *me, u32 *location, Elf_Addr v) 1464e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 1474e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer unsigned long insnlo = *location; 1484e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Addr val, vallo; 1494e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1504e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer /* Sign extend the addend we extract from the lo insn. */ 1514e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer vallo = ((insnlo & 0xffff) ^ 0x8000) - 0x8000; 1524e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1534e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer if (mips_hi16_list != NULL) { 1544e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer struct mips_hi16 *l; 1554e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1564e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer l = mips_hi16_list; 1574e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer while (l != NULL) { 1584e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer struct mips_hi16 *next; 1594e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer unsigned long insn; 1604e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1614e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer /* 1624e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * The value for the HI16 had best be the same. 1634e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer */ 1644e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer if (v != l->value) 1654e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer goto out_danger; 1664e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1674e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer /* 1684e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * Do the HI16 relocation. Note that we actually don't 1694e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * need to know anything about the LO16 itself, except 1704e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * where to find the low 16 bits of the addend needed 1714e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * by the LO16. 1724e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer */ 1734e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer insn = *l->addr; 1744e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer val = ((insn & 0xffff) << 16) + vallo; 1754e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer val += v; 1764e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1774e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer /* 1784e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * Account for the sign extension that will happen in 1794e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * the low bits. 1804e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer */ 1814e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer val = ((val >> 16) + ((val & 0x8000) != 0)) & 0xffff; 1824e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1834e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer insn = (insn & ~0xffff) | val; 1844e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer *l->addr = insn; 1854e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1864e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer next = l->next; 1874e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer kfree(l); 1884e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer l = next; 1894e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer } 1904e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1914e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer mips_hi16_list = NULL; 1924e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer } 1934e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 1944e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer /* 1954e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer * Ok, we're done with the HI16 relocs. Now deal with the LO16. 1964e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer */ 1974e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer val = v + vallo; 1984e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer insnlo = (insnlo & ~0xffff) | (val & 0xffff); 1994e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer *location = insnlo; 2004e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2014e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 2024e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2034e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferout_danger: 2046f9fdeb6761a46ded6bf4b799993a3f235ab853dRalf Baechle pr_err("module %s: dangerous R_MIPS_LO16 REL relocation\n", me->name); 2054e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2064e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return -ENOEXEC; 2074e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 2084e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2094e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int apply_r_mips_lo16_rela(struct module *me, u32 *location, Elf_Addr v) 2104e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 2114e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer *location = (*location & 0xffff0000) | (v & 0xffff); 2124e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2134e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 2144e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 2154e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2164e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int apply_r_mips_64_rela(struct module *me, u32 *location, Elf_Addr v) 2174e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 2184e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer *(Elf_Addr *)location = v; 2194e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2204e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 2214e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 2224e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2234e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int apply_r_mips_higher_rela(struct module *me, u32 *location, 2244e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Addr v) 2254e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 2264e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer *location = (*location & 0xffff0000) | 2274e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer ((((long long) v + 0x80008000LL) >> 32) & 0xffff); 2284e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2294e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 2304e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 2314e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2324e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int apply_r_mips_highest_rela(struct module *me, u32 *location, 2334e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Addr v) 2344e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 2354e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer *location = (*location & 0xffff0000) | 2364e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer ((((long long) v + 0x800080008000LL) >> 48) & 0xffff); 2374e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2384e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 2394e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 2404e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2414e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int (*reloc_handlers_rel[]) (struct module *me, u32 *location, 2424e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Addr v) = { 2434e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_NONE] = apply_r_mips_none, 2444e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_32] = apply_r_mips_32_rel, 2454e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_26] = apply_r_mips_26_rel, 2464e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_HI16] = apply_r_mips_hi16_rel, 2474e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_LO16] = apply_r_mips_lo16_rel 2484e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer}; 2494e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2504e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferstatic int (*reloc_handlers_rela[]) (struct module *me, u32 *location, 2514e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Addr v) = { 2524e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_NONE] = apply_r_mips_none, 2534e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_32] = apply_r_mips_32_rela, 2544e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_26] = apply_r_mips_26_rela, 2554e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_HI16] = apply_r_mips_hi16_rela, 2564e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_LO16] = apply_r_mips_lo16_rela, 2574e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_64] = apply_r_mips_64_rela, 2584e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_HIGHER] = apply_r_mips_higher_rela, 2594e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer [R_MIPS_HIGHEST] = apply_r_mips_highest_rela 2604e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer}; 2614e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2624e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferint apply_relocate(Elf_Shdr *sechdrs, const char *strtab, 2634e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer unsigned int symindex, unsigned int relsec, 2644e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer struct module *me) 2654e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 2664e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Mips_Rel *rel = (void *) sechdrs[relsec].sh_addr; 2674e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Sym *sym; 2684e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer u32 *location; 2694e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer unsigned int i; 2704e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Addr v; 2714e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer int res; 2724e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2734e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer pr_debug("Applying relocate section %u to %u\n", relsec, 2744e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer sechdrs[relsec].sh_info); 2754e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2764e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 2774e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer /* This is where to make the change */ 2784e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr 2794e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer + rel[i].r_offset; 2804e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer /* This is the symbol it is referring to */ 2814e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer sym = (Elf_Sym *)sechdrs[symindex].sh_addr 2824e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer + ELF_MIPS_R_SYM(rel[i]); 2830e66fff883ef1b6e4c5031e8add8827cd0e2a195Gabor Juhos if (IS_ERR_VALUE(sym->st_value)) { 284f3bf07b9a367c342bcbc9f47d525d3cf5e8b4f3bAtsushi Nemoto /* Ignore unresolved weak symbol */ 285f3bf07b9a367c342bcbc9f47d525d3cf5e8b4f3bAtsushi Nemoto if (ELF_ST_BIND(sym->st_info) == STB_WEAK) 286f3bf07b9a367c342bcbc9f47d525d3cf5e8b4f3bAtsushi Nemoto continue; 2874e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer printk(KERN_WARNING "%s: Unknown symbol %s\n", 2884e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer me->name, strtab + sym->st_name); 2894e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return -ENOENT; 2904e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer } 2914e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2924e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer v = sym->st_value; 2934e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2944e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer res = reloc_handlers_rel[ELF_MIPS_R_TYPE(rel[i])](me, location, v); 2954e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer if (res) 2964e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return res; 2974e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer } 2984e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 2994e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 3004e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 3014e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 3024e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seuferint apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab, 3034e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer unsigned int symindex, unsigned int relsec, 3044e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer struct module *me) 3054e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer{ 3064e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Mips_Rela *rel = (void *) sechdrs[relsec].sh_addr; 3074e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Sym *sym; 3084e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer u32 *location; 3094e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer unsigned int i; 3104e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer Elf_Addr v; 3114e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer int res; 3124e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 3134e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer pr_debug("Applying relocate section %u to %u\n", relsec, 3144e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer sechdrs[relsec].sh_info); 3154e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 3164e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 3174e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer /* This is where to make the change */ 3184e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr 3194e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer + rel[i].r_offset; 3204e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer /* This is the symbol it is referring to */ 3214e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer sym = (Elf_Sym *)sechdrs[symindex].sh_addr 3224e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer + ELF_MIPS_R_SYM(rel[i]); 3230e66fff883ef1b6e4c5031e8add8827cd0e2a195Gabor Juhos if (IS_ERR_VALUE(sym->st_value)) { 324f3bf07b9a367c342bcbc9f47d525d3cf5e8b4f3bAtsushi Nemoto /* Ignore unresolved weak symbol */ 325f3bf07b9a367c342bcbc9f47d525d3cf5e8b4f3bAtsushi Nemoto if (ELF_ST_BIND(sym->st_info) == STB_WEAK) 326f3bf07b9a367c342bcbc9f47d525d3cf5e8b4f3bAtsushi Nemoto continue; 3274e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer printk(KERN_WARNING "%s: Unknown symbol %s\n", 3284e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer me->name, strtab + sym->st_name); 3294e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return -ENOENT; 3304e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer } 3314e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 3324e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer v = sym->st_value + rel[i].r_addend; 3334e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 3344e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer res = reloc_handlers_rela[ELF_MIPS_R_TYPE(rel[i])](me, location, v); 3354e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer if (res) 3364e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return res; 3374e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer } 3384e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 3394e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer return 0; 3404e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer} 3414e6a05fe5f87efd58da16fbf61e1f6329575fcfdThiemo Seufer 3421da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds/* Given an address, look for it in the module exception tables. */ 3431da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsconst struct exception_table_entry *search_module_dbetables(unsigned long addr) 3441da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3451da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds unsigned long flags; 3461da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds const struct exception_table_entry *e = NULL; 3471da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct mod_arch_specific *dbe; 3481da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3491da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irqsave(&dbe_lock, flags); 3501da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds list_for_each_entry(dbe, &dbe_list, dbe_list) { 3511da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds e = search_extable(dbe->dbe_start, dbe->dbe_end - 1, addr); 3521da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (e) 3531da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds break; 3541da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3551da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irqrestore(&dbe_lock, flags); 3561da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3571da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds /* Now, if we found one, we are running inside it now, hence 3581da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds we cannot unload the module, hence no refcnt needed. */ 3591da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return e; 3601da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3611da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3623a4fa0a25da81600ea0bcd75692ae8ca6050d165Robert P. J. Day/* Put in dbe list if necessary. */ 3631da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsint module_finalize(const Elf_Ehdr *hdr, 3641da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds const Elf_Shdr *sechdrs, 3651da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds struct module *me) 3661da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3671da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds const Elf_Shdr *s; 3681da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds char *secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset; 3691da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 37094bb0c1ab293c298a8852e4f10c4215bad6daa9bDavid Daney /* Make jump label nops. */ 37194bb0c1ab293c298a8852e4f10c4215bad6daa9bDavid Daney jump_label_apply_nops(me); 37294bb0c1ab293c298a8852e4f10c4215bad6daa9bDavid Daney 3731da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds INIT_LIST_HEAD(&me->arch.dbe_list); 3741da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds for (s = sechdrs; s < sechdrs + hdr->e_shnum; s++) { 3751da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds if (strcmp("__dbe_table", secstrings + s->sh_name) != 0) 3761da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds continue; 3771da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds me->arch.dbe_start = (void *)s->sh_addr; 3781da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds me->arch.dbe_end = (void *)s->sh_addr + s->sh_size; 3791da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&dbe_lock); 3801da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds list_add(&me->arch.dbe_list, &dbe_list); 3811da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&dbe_lock); 3821da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds } 3831da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds return 0; 3841da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 3851da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds 3861da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvaldsvoid module_arch_cleanup(struct module *mod) 3871da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds{ 3881da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_lock_irq(&dbe_lock); 3891da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds list_del(&mod->arch.dbe_list); 3901da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds spin_unlock_irq(&dbe_lock); 3911da177e4c3f41524e886b7f1b8a0c1fc7321cacLinus Torvalds} 392