Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #include <linux/moduleloader.h> |
| 2 | #include <linux/elf.h> |
| 3 | #include <linux/vmalloc.h> |
| 4 | #include <linux/fs.h> |
| 5 | #include <linux/string.h> |
| 6 | #include <linux/kernel.h> |
| 7 | |
| 8 | #if 0 |
| 9 | #define DEBUGP printk |
| 10 | #else |
| 11 | #define DEBUGP(fmt...) |
| 12 | #endif |
| 13 | |
| 14 | void *module_alloc(unsigned long size) |
| 15 | { |
| 16 | if (size == 0) |
| 17 | return NULL; |
| 18 | return vmalloc(size); |
| 19 | } |
| 20 | |
| 21 | |
| 22 | /* Free memory returned from module_alloc */ |
| 23 | void module_free(struct module *mod, void *module_region) |
| 24 | { |
| 25 | vfree(module_region); |
| 26 | /* FIXME: If module_region == mod->init_region, trim exception |
| 27 | table entries. */ |
| 28 | } |
| 29 | |
| 30 | /* We don't need anything special. */ |
| 31 | int module_frob_arch_sections(Elf_Ehdr *hdr, |
| 32 | Elf_Shdr *sechdrs, |
| 33 | char *secstrings, |
| 34 | struct module *mod) |
| 35 | { |
| 36 | return 0; |
| 37 | } |
| 38 | |
| 39 | int apply_relocate(Elf32_Shdr *sechdrs, |
| 40 | const char *strtab, |
| 41 | unsigned int symindex, |
| 42 | unsigned int relsec, |
| 43 | struct module *me) |
| 44 | { |
| 45 | unsigned int i; |
| 46 | Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr; |
| 47 | Elf32_Sym *sym; |
| 48 | uint32_t *location; |
| 49 | |
| 50 | DEBUGP("Applying relocate section %u to %u\n", relsec, |
| 51 | sechdrs[relsec].sh_info); |
| 52 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
| 53 | /* This is where to make the change */ |
| 54 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
| 55 | + rel[i].r_offset; |
| 56 | /* This is the symbol it is referring to. Note that all |
| 57 | undefined symbols have been resolved. */ |
| 58 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr |
| 59 | + ELF32_R_SYM(rel[i].r_info); |
| 60 | |
| 61 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
| 62 | case R_68K_32: |
| 63 | /* We add the value into the location given */ |
| 64 | *location += sym->st_value; |
| 65 | break; |
| 66 | case R_68K_PC32: |
| 67 | /* Add the value, subtract its postition */ |
| 68 | *location += sym->st_value - (uint32_t)location; |
| 69 | break; |
| 70 | default: |
| 71 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", |
| 72 | me->name, ELF32_R_TYPE(rel[i].r_info)); |
| 73 | return -ENOEXEC; |
| 74 | } |
| 75 | } |
| 76 | return 0; |
| 77 | } |
| 78 | |
| 79 | int apply_relocate_add(Elf32_Shdr *sechdrs, |
| 80 | const char *strtab, |
| 81 | unsigned int symindex, |
| 82 | unsigned int relsec, |
| 83 | struct module *me) |
| 84 | { |
| 85 | unsigned int i; |
| 86 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; |
| 87 | Elf32_Sym *sym; |
| 88 | uint32_t *location; |
| 89 | |
| 90 | DEBUGP("Applying relocate_add section %u to %u\n", relsec, |
| 91 | sechdrs[relsec].sh_info); |
| 92 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
| 93 | /* This is where to make the change */ |
| 94 | location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
| 95 | + rel[i].r_offset; |
| 96 | /* This is the symbol it is referring to. Note that all |
| 97 | undefined symbols have been resolved. */ |
| 98 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr |
| 99 | + ELF32_R_SYM(rel[i].r_info); |
| 100 | |
| 101 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
| 102 | case R_68K_32: |
| 103 | /* We add the value into the location given */ |
| 104 | *location = rel[i].r_addend + sym->st_value; |
| 105 | break; |
| 106 | case R_68K_PC32: |
| 107 | /* Add the value, subtract its postition */ |
| 108 | *location = rel[i].r_addend + sym->st_value - (uint32_t)location; |
| 109 | break; |
| 110 | default: |
| 111 | printk(KERN_ERR "module %s: Unknown relocation: %u\n", |
| 112 | me->name, ELF32_R_TYPE(rel[i].r_info)); |
| 113 | return -ENOEXEC; |
| 114 | } |
| 115 | } |
| 116 | return 0; |
| 117 | } |
| 118 | |
| 119 | int module_finalize(const Elf_Ehdr *hdr, |
| 120 | const Elf_Shdr *sechdrs, |
| 121 | struct module *me) |
| 122 | { |
| 123 | return 0; |
| 124 | } |
| 125 | |
| 126 | void module_arch_cleanup(struct module *mod) |
| 127 | { |
| 128 | } |