Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 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 | |
Arnd Bergmann | 9fb24cc | 2009-06-27 14:50:51 +0200 | [diff] [blame] | 26 | #include <linux/moduleloader.h> |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 27 | #include <linux/module.h> |
| 28 | #include <linux/vmalloc.h> |
| 29 | |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 30 | int 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; |
Arnd Bergmann | c606747 | 2009-06-27 14:46:35 +0200 | [diff] [blame] | 43 | s32 r_offset; |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 44 | |
Arnd Bergmann | c606747 | 2009-06-27 14:46:35 +0200 | [diff] [blame] | 45 | r_offset = ELF32_R_SYM(rel->r_info); |
| 46 | if ((r_offset < 0) || |
| 47 | (r_offset > (symsec->sh_size / sizeof(Elf32_Sym)))) { |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 48 | printk(KERN_ERR "%s: bad relocation, section %d reloc %d\n", |
| 49 | me->name, relindex, i); |
| 50 | return -ENOEXEC; |
| 51 | } |
| 52 | |
Arnd Bergmann | c606747 | 2009-06-27 14:46:35 +0200 | [diff] [blame] | 53 | sym = ((Elf32_Sym *)symsec->sh_addr) + r_offset; |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 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 | |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 128 | /* Given an address, look for it in the module exception tables. */ |
| 129 | const struct exception_table_entry *search_module_dbetables(unsigned long addr) |
| 130 | { |
Arnd Bergmann | c606747 | 2009-06-27 14:46:35 +0200 | [diff] [blame] | 131 | return NULL; |
Chen Liqin | 6bc9a39 | 2009-06-12 22:01:00 +0800 | [diff] [blame] | 132 | } |