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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 | #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 printk #else #define DEBUGP(fmt...) #endif void *module_alloc(unsigned long size) { if (size == 0) return NULL; return vmalloc(size); } /* Free memory returned from module_alloc */ void module_free(struct module *mod, void *module_region) { vfree(module_region); } /* We don't need anything special. */ int module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs, char *secstrings, struct module *mod) { return 0; } int apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relsec, struct module *me) { printk(KERN_ERR "module %s: RELOCATION unsupported\n", me->name); return -ENOEXEC; } int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex, unsigned int relsec, struct module *me) { unsigned int i; Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; DEBUGP("Applying relocate section %u to %u\n", relsec, sechdrs[relsec].sh_info); for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { /* This is where to make the change */ uint32_t *loc = (uint32_t *)(sechdrs[sechdrs[relsec].sh_info].sh_addr + rela[i].r_offset); /* This is the symbol it is referring to. Note that all undefined symbols have been resolved. */ Elf32_Sym *sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + ELF32_R_SYM(rela[i].r_info); uint32_t v = sym->st_value + rela[i].r_addend; switch (ELF32_R_TYPE(rela[i].r_info)) { case R_H8_DIR24R8: loc = (uint32_t *)((uint32_t)loc - 1); *loc = (*loc & 0xff000000) | ((*loc & 0xffffff) + v); break; case R_H8_DIR24A8: if (ELF32_R_SYM(rela[i].r_info)) *loc += v; break; case R_H8_DIR32: case R_H8_DIR32A16: *loc += v; break; case R_H8_PCREL16: v -= (unsigned long)loc + 2; if ((Elf32_Sword)v > 0x7fff || (Elf32_Sword)v < -(Elf32_Sword)0x8000) goto overflow; else *(unsigned short *)loc = v; break; case R_H8_PCREL8: v -= (unsigned long)loc + 1; if ((Elf32_Sword)v > 0x7f || (Elf32_Sword)v < -(Elf32_Sword)0x80) goto overflow; else *(unsigned char *)loc = v; break; default: printk(KERN_ERR "module %s: Unknown relocation: %u\n", me->name, ELF32_R_TYPE(rela[i].r_info)); return -ENOEXEC; } } return 0; overflow: printk(KERN_ERR "module %s: relocation offset overflow: %08x\n", me->name, rela[i].r_offset); return -ENOEXEC; } int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *me) { return 0; } void module_arch_cleanup(struct module *mod) { } |