Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* Kernel module help for sparc32. |
| 2 | * |
| 3 | * Copyright (C) 2001 Rusty Russell. |
| 4 | * Copyright (C) 2002 David S. Miller. |
| 5 | */ |
| 6 | |
| 7 | #include <linux/moduleloader.h> |
| 8 | #include <linux/kernel.h> |
| 9 | #include <linux/elf.h> |
| 10 | #include <linux/vmalloc.h> |
| 11 | #include <linux/fs.h> |
| 12 | #include <linux/string.h> |
| 13 | |
| 14 | void *module_alloc(unsigned long size) |
| 15 | { |
| 16 | void *ret; |
| 17 | |
| 18 | /* We handle the zero case fine, unlike vmalloc */ |
| 19 | if (size == 0) |
| 20 | return NULL; |
| 21 | |
| 22 | ret = vmalloc(size); |
| 23 | if (!ret) |
| 24 | ret = ERR_PTR(-ENOMEM); |
| 25 | else |
| 26 | memset(ret, 0, size); |
| 27 | |
| 28 | return ret; |
| 29 | } |
| 30 | |
| 31 | /* Free memory returned from module_core_alloc/module_init_alloc */ |
| 32 | void module_free(struct module *mod, void *module_region) |
| 33 | { |
| 34 | vfree(module_region); |
| 35 | /* FIXME: If module_region == mod->init_region, trim exception |
| 36 | table entries. */ |
| 37 | } |
| 38 | |
| 39 | /* Make generic code ignore STT_REGISTER dummy undefined symbols, |
| 40 | * and replace references to .func with func as in ppc64's dedotify. |
| 41 | */ |
| 42 | int module_frob_arch_sections(Elf_Ehdr *hdr, |
| 43 | Elf_Shdr *sechdrs, |
| 44 | char *secstrings, |
| 45 | struct module *mod) |
| 46 | { |
| 47 | unsigned int symidx; |
| 48 | Elf32_Sym *sym; |
| 49 | char *strtab; |
| 50 | int i; |
| 51 | |
| 52 | for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) { |
| 53 | if (symidx == hdr->e_shnum-1) { |
| 54 | printk("%s: no symtab found.\n", mod->name); |
| 55 | return -ENOEXEC; |
| 56 | } |
| 57 | } |
| 58 | sym = (Elf32_Sym *)sechdrs[symidx].sh_addr; |
| 59 | strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr; |
| 60 | |
| 61 | for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) { |
| 62 | if (sym[i].st_shndx == SHN_UNDEF) { |
| 63 | if (ELF32_ST_TYPE(sym[i].st_info) == STT_REGISTER) |
| 64 | sym[i].st_shndx = SHN_ABS; |
| 65 | else { |
| 66 | char *name = strtab + sym[i].st_name; |
| 67 | if (name[0] == '.') |
| 68 | memmove(name, name+1, strlen(name)); |
| 69 | } |
| 70 | } |
| 71 | } |
| 72 | return 0; |
| 73 | } |
| 74 | |
| 75 | int apply_relocate(Elf32_Shdr *sechdrs, |
| 76 | const char *strtab, |
| 77 | unsigned int symindex, |
| 78 | unsigned int relsec, |
| 79 | struct module *me) |
| 80 | { |
| 81 | printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n", |
| 82 | me->name); |
| 83 | return -ENOEXEC; |
| 84 | } |
| 85 | |
| 86 | int apply_relocate_add(Elf32_Shdr *sechdrs, |
| 87 | const char *strtab, |
| 88 | unsigned int symindex, |
| 89 | unsigned int relsec, |
| 90 | struct module *me) |
| 91 | { |
| 92 | unsigned int i; |
| 93 | Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; |
| 94 | Elf32_Sym *sym; |
| 95 | u8 *location; |
| 96 | u32 *loc32; |
| 97 | |
| 98 | for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { |
| 99 | Elf32_Addr v; |
| 100 | |
| 101 | /* This is where to make the change */ |
| 102 | location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr |
| 103 | + rel[i].r_offset; |
| 104 | loc32 = (u32 *) location; |
| 105 | /* This is the symbol it is referring to. Note that all |
| 106 | undefined symbols have been resolved. */ |
| 107 | sym = (Elf32_Sym *)sechdrs[symindex].sh_addr |
| 108 | + ELF32_R_SYM(rel[i].r_info); |
| 109 | v = sym->st_value + rel[i].r_addend; |
| 110 | |
| 111 | switch (ELF32_R_TYPE(rel[i].r_info)) { |
| 112 | case R_SPARC_32: |
| 113 | location[0] = v >> 24; |
| 114 | location[1] = v >> 16; |
| 115 | location[2] = v >> 8; |
| 116 | location[3] = v >> 0; |
| 117 | break; |
| 118 | |
| 119 | case R_SPARC_WDISP30: |
| 120 | v -= (Elf32_Addr) location; |
| 121 | *loc32 = (*loc32 & ~0x3fffffff) | |
| 122 | ((v >> 2) & 0x3fffffff); |
| 123 | break; |
| 124 | |
| 125 | case R_SPARC_WDISP22: |
| 126 | v -= (Elf32_Addr) location; |
| 127 | *loc32 = (*loc32 & ~0x3fffff) | |
| 128 | ((v >> 2) & 0x3fffff); |
| 129 | break; |
| 130 | |
| 131 | case R_SPARC_LO10: |
| 132 | *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff); |
| 133 | break; |
| 134 | |
| 135 | case R_SPARC_HI22: |
| 136 | *loc32 = (*loc32 & ~0x3fffff) | |
| 137 | ((v >> 10) & 0x3fffff); |
| 138 | break; |
| 139 | |
| 140 | default: |
| 141 | printk(KERN_ERR "module %s: Unknown relocation: %x\n", |
| 142 | me->name, |
| 143 | (int) (ELF32_R_TYPE(rel[i].r_info) & 0xff)); |
| 144 | return -ENOEXEC; |
| 145 | }; |
| 146 | } |
| 147 | return 0; |
| 148 | } |
| 149 | |
| 150 | int module_finalize(const Elf_Ehdr *hdr, |
| 151 | const Elf_Shdr *sechdrs, |
| 152 | struct module *me) |
| 153 | { |
| 154 | return 0; |
| 155 | } |
| 156 | |
| 157 | void module_arch_cleanup(struct module *mod) |
| 158 | { |
| 159 | } |