1 /* 2 * This file is subject to the terms and conditions of the GNU General Public 3 * License. See the file COPYING in the main directory of this archive 4 * for more details. 5 */ 6 7 #include <linux/moduleloader.h> 8 #include <linux/elf.h> 9 #include <linux/vmalloc.h> 10 #include <linux/fs.h> 11 #include <linux/string.h> 12 #include <linux/kernel.h> 13 14 #if 0 15 #define DEBUGP printk 16 #else 17 #define DEBUGP(fmt...) 18 #endif 19 20 #ifdef CONFIG_MODULES 21 22 void *module_alloc(unsigned long size) 23 { 24 if (size == 0) 25 return NULL; 26 return vmalloc(size); 27 } 28 29 30 /* Free memory returned from module_alloc */ 31 void module_free(struct module *mod, void *module_region) 32 { 33 vfree(module_region); 34 /* FIXME: If module_region == mod->init_region, trim exception 35 table entries. */ 36 } 37 38 /* We don't need anything special. */ 39 int module_frob_arch_sections(Elf_Ehdr *hdr, 40 Elf_Shdr *sechdrs, 41 char *secstrings, 42 struct module *mod) 43 { 44 return 0; 45 } 46 47 int apply_relocate(Elf32_Shdr *sechdrs, 48 const char *strtab, 49 unsigned int symindex, 50 unsigned int relsec, 51 struct module *me) 52 { 53 unsigned int i; 54 Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr; 55 Elf32_Sym *sym; 56 uint32_t *location; 57 58 DEBUGP("Applying relocate section %u to %u\n", relsec, 59 sechdrs[relsec].sh_info); 60 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 61 /* This is where to make the change */ 62 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr 63 + rel[i].r_offset; 64 /* This is the symbol it is referring to. Note that all 65 undefined symbols have been resolved. */ 66 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr 67 + ELF32_R_SYM(rel[i].r_info); 68 69 switch (ELF32_R_TYPE(rel[i].r_info)) { 70 case R_68K_32: 71 /* We add the value into the location given */ 72 *location += sym->st_value; 73 break; 74 case R_68K_PC32: 75 /* Add the value, subtract its postition */ 76 *location += sym->st_value - (uint32_t)location; 77 break; 78 default: 79 printk(KERN_ERR "module %s: Unknown relocation: %u\n", 80 me->name, ELF32_R_TYPE(rel[i].r_info)); 81 return -ENOEXEC; 82 } 83 } 84 return 0; 85 } 86 87 int apply_relocate_add(Elf32_Shdr *sechdrs, 88 const char *strtab, 89 unsigned int symindex, 90 unsigned int relsec, 91 struct module *me) 92 { 93 unsigned int i; 94 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; 95 Elf32_Sym *sym; 96 uint32_t *location; 97 98 DEBUGP("Applying relocate_add section %u to %u\n", relsec, 99 sechdrs[relsec].sh_info); 100 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 101 /* This is where to make the change */ 102 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr 103 + rel[i].r_offset; 104 /* This is the symbol it is referring to. Note that all 105 undefined symbols have been resolved. */ 106 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr 107 + ELF32_R_SYM(rel[i].r_info); 108 109 switch (ELF32_R_TYPE(rel[i].r_info)) { 110 case R_68K_32: 111 /* We add the value into the location given */ 112 *location = rel[i].r_addend + sym->st_value; 113 break; 114 case R_68K_PC32: 115 /* Add the value, subtract its postition */ 116 *location = rel[i].r_addend + sym->st_value - (uint32_t)location; 117 break; 118 default: 119 printk(KERN_ERR "module %s: Unknown relocation: %u\n", 120 me->name, ELF32_R_TYPE(rel[i].r_info)); 121 return -ENOEXEC; 122 } 123 } 124 return 0; 125 } 126 127 int module_finalize(const Elf_Ehdr *hdr, 128 const Elf_Shdr *sechdrs, 129 struct module *mod) 130 { 131 module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end); 132 133 return 0; 134 } 135 136 void module_arch_cleanup(struct module *mod) 137 { 138 } 139 140 #endif /* CONFIG_MODULES */ 141 142 void module_fixup(struct module *mod, struct m68k_fixup_info *start, 143 struct m68k_fixup_info *end) 144 { 145 struct m68k_fixup_info *fixup; 146 147 for (fixup = start; fixup < end; fixup++) { 148 switch (fixup->type) { 149 case m68k_fixup_memoffset: 150 *(u32 *)fixup->addr = m68k_memoffset; 151 break; 152 case m68k_fixup_vnode_shift: 153 *(u16 *)fixup->addr += m68k_virt_to_node_shift; 154 break; 155 } 156 } 157 } 158