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 int apply_relocate(Elf32_Shdr *sechdrs, 23 const char *strtab, 24 unsigned int symindex, 25 unsigned int relsec, 26 struct module *me) 27 { 28 unsigned int i; 29 Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr; 30 Elf32_Sym *sym; 31 uint32_t *location; 32 33 DEBUGP("Applying relocate section %u to %u\n", relsec, 34 sechdrs[relsec].sh_info); 35 for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 36 /* This is where to make the change */ 37 location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr 38 + rel[i].r_offset; 39 /* This is the symbol it is referring to. Note that all 40 undefined symbols have been resolved. */ 41 sym = (Elf32_Sym *)sechdrs[symindex].sh_addr 42 + ELF32_R_SYM(rel[i].r_info); 43 44 switch (ELF32_R_TYPE(rel[i].r_info)) { 45 case R_68K_32: 46 /* We add the value into the location given */ 47 *location += sym->st_value; 48 break; 49 case R_68K_PC32: 50 /* Add the value, subtract its position */ 51 *location += sym->st_value - (uint32_t)location; 52 break; 53 default: 54 printk(KERN_ERR "module %s: Unknown relocation: %u\n", 55 me->name, ELF32_R_TYPE(rel[i].r_info)); 56 return -ENOEXEC; 57 } 58 } 59 return 0; 60 } 61 62 int apply_relocate_add(Elf32_Shdr *sechdrs, 63 const char *strtab, 64 unsigned int symindex, 65 unsigned int relsec, 66 struct module *me) 67 { 68 unsigned int i; 69 Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; 70 Elf32_Sym *sym; 71 uint32_t *location; 72 73 DEBUGP("Applying relocate_add 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 84 switch (ELF32_R_TYPE(rel[i].r_info)) { 85 case R_68K_32: 86 /* We add the value into the location given */ 87 *location = rel[i].r_addend + sym->st_value; 88 break; 89 case R_68K_PC32: 90 /* Add the value, subtract its position */ 91 *location = rel[i].r_addend + sym->st_value - (uint32_t)location; 92 break; 93 default: 94 printk(KERN_ERR "module %s: Unknown relocation: %u\n", 95 me->name, ELF32_R_TYPE(rel[i].r_info)); 96 return -ENOEXEC; 97 } 98 } 99 return 0; 100 } 101 102 int module_finalize(const Elf_Ehdr *hdr, 103 const Elf_Shdr *sechdrs, 104 struct module *mod) 105 { 106 module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end); 107 return 0; 108 } 109 110 #endif /* CONFIG_MODULES */ 111 112 void module_fixup(struct module *mod, struct m68k_fixup_info *start, 113 struct m68k_fixup_info *end) 114 { 115 #ifdef CONFIG_MMU 116 struct m68k_fixup_info *fixup; 117 118 for (fixup = start; fixup < end; fixup++) { 119 switch (fixup->type) { 120 case m68k_fixup_memoffset: 121 *(u32 *)fixup->addr = m68k_memoffset; 122 break; 123 case m68k_fixup_vnode_shift: 124 *(u16 *)fixup->addr += m68k_virt_to_node_shift; 125 break; 126 } 127 } 128 #endif 129 } 130