1 /* Kernel module help for SH. 2 3 SHcompact version by Kaz Kojima and Paul Mundt. 4 5 SHmedia bits: 6 7 Copyright 2004 SuperH (UK) Ltd 8 Author: Richard Curnow 9 10 Based on the sh version, and on code from the sh64-specific parts of 11 modutils, originally written by Richard Curnow and Ben Gaster. 12 13 This program is free software; you can redistribute it and/or modify 14 it under the terms of the GNU General Public License as published by 15 the Free Software Foundation; either version 2 of the License, or 16 (at your option) any later version. 17 18 This program is distributed in the hope that it will be useful, 19 but WITHOUT ANY WARRANTY; without even the implied warranty of 20 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 21 GNU General Public License for more details. 22 23 You should have received a copy of the GNU General Public License 24 along with this program; if not, write to the Free Software 25 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 26 */ 27 #include <linux/moduleloader.h> 28 #include <linux/elf.h> 29 #include <linux/vmalloc.h> 30 #include <linux/fs.h> 31 #include <linux/string.h> 32 #include <linux/kernel.h> 33 #include <asm/unaligned.h> 34 35 void *module_alloc(unsigned long size) 36 { 37 if (size == 0) 38 return NULL; 39 return vmalloc(size); 40 } 41 42 43 /* Free memory returned from module_alloc */ 44 void module_free(struct module *mod, void *module_region) 45 { 46 vfree(module_region); 47 /* FIXME: If module_region == mod->init_region, trim exception 48 table entries. */ 49 } 50 51 /* We don't need anything special. */ 52 int module_frob_arch_sections(Elf_Ehdr *hdr, 53 Elf_Shdr *sechdrs, 54 char *secstrings, 55 struct module *mod) 56 { 57 return 0; 58 } 59 60 int apply_relocate_add(Elf32_Shdr *sechdrs, 61 const char *strtab, 62 unsigned int symindex, 63 unsigned int relsec, 64 struct module *me) 65 { 66 unsigned int i; 67 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; 68 Elf32_Sym *sym; 69 Elf32_Addr relocation; 70 uint32_t *location; 71 uint32_t value; 72 73 pr_debug("Applying relocate section %u to %u\n", relsec, 74 sechdrs[relsec].sh_info); 75 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 76 /* This is where to make the change */ 77 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr 78 + rel[i].r_offset; 79 /* This is the symbol it is referring to. Note that all 80 undefined symbols have been resolved. */ 81 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr 82 + ELF32_R_SYM(rel[i].r_info); 83 relocation = sym->st_value + rel[i].r_addend; 84 85 #ifdef CONFIG_SUPERH64 86 /* For text addresses, bit2 of the st_other field indicates 87 * whether the symbol is SHmedia (1) or SHcompact (0). If 88 * SHmedia, the LSB of the symbol needs to be asserted 89 * for the CPU to be in SHmedia mode when it starts executing 90 * the branch target. */ 91 relocation |= (sym->st_other & 4); 92 #endif 93 94 switch (ELF32_R_TYPE(rel[i].r_info)) { 95 case R_SH_DIR32: 96 value = get_unaligned(location); 97 value += relocation; 98 put_unaligned(value, location); 99 break; 100 case R_SH_REL32: 101 relocation = (relocation - (Elf32_Addr) location); 102 value = get_unaligned(location); 103 value += relocation; 104 put_unaligned(value, location); 105 break; 106 case R_SH_IMM_LOW16: 107 *location = (*location & ~0x3fffc00) | 108 ((relocation & 0xffff) << 10); 109 break; 110 case R_SH_IMM_MEDLOW16: 111 *location = (*location & ~0x3fffc00) | 112 (((relocation >> 16) & 0xffff) << 10); 113 break; 114 case R_SH_IMM_LOW16_PCREL: 115 relocation -= (Elf32_Addr) location; 116 *location = (*location & ~0x3fffc00) | 117 ((relocation & 0xffff) << 10); 118 break; 119 case R_SH_IMM_MEDLOW16_PCREL: 120 relocation -= (Elf32_Addr) location; 121 *location = (*location & ~0x3fffc00) | 122 (((relocation >> 16) & 0xffff) << 10); 123 break; 124 default: 125 printk(KERN_ERR "module %s: Unknown relocation: %u\n", 126 me->name, ELF32_R_TYPE(rel[i].r_info)); 127 return -ENOEXEC; 128 } 129 } 130 return 0; 131 } 132 133 int apply_relocate(Elf32_Shdr *sechdrs, 134 const char *strtab, 135 unsigned int symindex, 136 unsigned int relsec, 137 struct module *me) 138 { 139 printk(KERN_ERR "module %s: REL RELOCATION unsupported\n", 140 me->name); 141 return -ENOEXEC; 142 } 143 144 int module_finalize(const Elf_Ehdr *hdr, 145 const Elf_Shdr *sechdrs, 146 struct module *me) 147 { 148 return 0; 149 } 150 151 void module_arch_cleanup(struct module *mod) 152 { 153 } 154