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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 | /* * This file is subject to the terms and conditions of the GNU General Public * License. See the file COPYING in the main directory of this archive * for more details. */ #include <linux/moduleloader.h> #include <linux/elf.h> #include <linux/vmalloc.h> #include <linux/fs.h> #include <linux/string.h> #include <linux/kernel.h> #if 0 #define DEBUGP(fmt, ...) printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) #else #define DEBUGP(fmt, ...) no_printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__) #endif #ifdef CONFIG_MODULES int apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relsec, struct module *me) { unsigned int i; Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr; Elf32_Sym *sym; uint32_t *location; DEBUGP("Applying relocate section %u to %u\n", relsec, sechdrs[relsec].sh_info); for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { /* This is where to make the change */ location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + rel[i].r_offset; /* This is the symbol it is referring to. Note that all undefined symbols have been resolved. */ sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + ELF32_R_SYM(rel[i].r_info); switch (ELF32_R_TYPE(rel[i].r_info)) { case R_68K_32: /* We add the value into the location given */ *location += sym->st_value; break; case R_68K_PC32: /* Add the value, subtract its position */ *location += sym->st_value - (uint32_t)location; break; default: pr_err("module %s: Unknown relocation: %u\n", me->name, ELF32_R_TYPE(rel[i].r_info)); return -ENOEXEC; } } return 0; } int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relsec, struct module *me) { unsigned int i; Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; Elf32_Sym *sym; uint32_t *location; DEBUGP("Applying relocate_add section %u to %u\n", relsec, sechdrs[relsec].sh_info); for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { /* This is where to make the change */ location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + rel[i].r_offset; /* This is the symbol it is referring to. Note that all undefined symbols have been resolved. */ sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + ELF32_R_SYM(rel[i].r_info); switch (ELF32_R_TYPE(rel[i].r_info)) { case R_68K_32: /* We add the value into the location given */ *location = rel[i].r_addend + sym->st_value; break; case R_68K_PC32: /* Add the value, subtract its position */ *location = rel[i].r_addend + sym->st_value - (uint32_t)location; break; default: pr_err("module %s: Unknown relocation: %u\n", me->name, ELF32_R_TYPE(rel[i].r_info)); return -ENOEXEC; } } return 0; } int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *mod) { module_fixup(mod, mod->arch.fixup_start, mod->arch.fixup_end); return 0; } #endif /* CONFIG_MODULES */ void module_fixup(struct module *mod, struct m68k_fixup_info *start, struct m68k_fixup_info *end) { #ifdef CONFIG_MMU struct m68k_fixup_info *fixup; for (fixup = start; fixup < end; fixup++) { switch (fixup->type) { case m68k_fixup_memoffset: *(u32 *)fixup->addr = m68k_memoffset; break; case m68k_fixup_vnode_shift: *(u16 *)fixup->addr += m68k_virt_to_node_shift; break; } } #endif } |