1/* 2 * arch/score/kernel/module.c 3 * 4 * Score Processor version. 5 * 6 * Copyright (C) 2009 Sunplus Core Technology Co., Ltd. 7 * Chen Liqin <liqin.chen@sunplusct.com> 8 * Lennox Wu <lennox.wu@sunplusct.com> 9 * 10 * This program is free software; you can redistribute it and/or modify 11 * it under the terms of the GNU General Public License as published by 12 * the Free Software Foundation; either version 2 of the License, or 13 * (at your option) any later version. 14 * 15 * This program is distributed in the hope that it will be useful, 16 * but WITHOUT ANY WARRANTY; without even the implied warranty of 17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 18 * GNU General Public License for more details. 19 * 20 * You should have received a copy of the GNU General Public License 21 * along with this program; if not, see the file COPYING, or write 22 * to the Free Software Foundation, Inc., 23 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA 24 */ 25 26#include <linux/moduleloader.h> 27#include <linux/module.h> 28#include <linux/vmalloc.h> 29 30int apply_relocate(Elf_Shdr *sechdrs, const char *strtab, 31 unsigned int symindex, unsigned int relindex, 32 struct module *me) 33{ 34 Elf32_Shdr *symsec = sechdrs + symindex; 35 Elf32_Shdr *relsec = sechdrs + relindex; 36 Elf32_Shdr *dstsec = sechdrs + relsec->sh_info; 37 Elf32_Rel *rel = (void *)relsec->sh_addr; 38 unsigned int i; 39 40 for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) { 41 unsigned long loc; 42 Elf32_Sym *sym; 43 s32 r_offset; 44 45 r_offset = ELF32_R_SYM(rel->r_info); 46 if ((r_offset < 0) || 47 (r_offset > (symsec->sh_size / sizeof(Elf32_Sym)))) { 48 printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n", 49 me->name, relindex, i); 50 return -ENOEXEC; 51 } 52 53 sym = ((Elf32_Sym *)symsec->sh_addr) + r_offset; 54 55 if ((rel->r_offset < 0) || 56 (rel->r_offset > dstsec->sh_size - sizeof(u32))) { 57 printk(KERN_ERR "%s: out of bounds relocation, " 58 "section %d reloc %d offset %d size %d\n", 59 me->name, relindex, i, rel->r_offset, 60 dstsec->sh_size); 61 return -ENOEXEC; 62 } 63 64 loc = dstsec->sh_addr + rel->r_offset; 65 switch (ELF32_R_TYPE(rel->r_info)) { 66 case R_SCORE_NONE: 67 break; 68 case R_SCORE_ABS32: 69 *(unsigned long *)loc += sym->st_value; 70 break; 71 case R_SCORE_HI16: 72 break; 73 case R_SCORE_LO16: { 74 unsigned long hi16_offset, offset; 75 unsigned long uvalue; 76 unsigned long temp, temp_hi; 77 temp_hi = *((unsigned long *)loc - 1); 78 temp = *(unsigned long *)loc; 79 80 hi16_offset = (((((temp_hi) >> 16) & 0x3) << 15) | 81 ((temp_hi) & 0x7fff)) >> 1; 82 offset = ((temp >> 16 & 0x03) << 15) | 83 ((temp & 0x7fff) >> 1); 84 offset = (hi16_offset << 16) | (offset & 0xffff); 85 uvalue = sym->st_value + offset; 86 hi16_offset = (uvalue >> 16) << 1; 87 88 temp_hi = ((temp_hi) & (~(0x37fff))) | 89 (hi16_offset & 0x7fff) | 90 ((hi16_offset << 1) & 0x30000); 91 *((unsigned long *)loc - 1) = temp_hi; 92 93 offset = (uvalue & 0xffff) << 1; 94 temp = (temp & (~(0x37fff))) | (offset & 0x7fff) | 95 ((offset << 1) & 0x30000); 96 *(unsigned long *)loc = temp; 97 break; 98 } 99 case R_SCORE_24: { 100 unsigned long hi16_offset, offset; 101 unsigned long uvalue; 102 unsigned long temp; 103 104 temp = *(unsigned long *)loc; 105 offset = (temp & 0x03FF7FFE); 106 hi16_offset = (offset & 0xFFFF0000); 107 offset = (hi16_offset | ((offset & 0xFFFF) << 1)) >> 2; 108 109 uvalue = (sym->st_value + offset) >> 1; 110 uvalue = uvalue & 0x00ffffff; 111 112 temp = (temp & 0xfc008001) | 113 ((uvalue << 2) & 0x3ff0000) | 114 ((uvalue & 0x3fff) << 1); 115 *(unsigned long *)loc = temp; 116 break; 117 } 118 default: 119 printk(KERN_ERR "%s: unknown relocation: %u\n", 120 me->name, ELF32_R_TYPE(rel->r_info)); 121 return -ENOEXEC; 122 } 123 } 124 125 return 0; 126} 127 128/* Given an address, look for it in the module exception tables. */ 129const struct exception_table_entry *search_module_dbetables(unsigned long addr) 130{ 131 return NULL; 132} 133