11da177e4SLinus Torvalds #include <linux/moduleloader.h> 21da177e4SLinus Torvalds #include <linux/elf.h> 31da177e4SLinus Torvalds #include <linux/vmalloc.h> 41da177e4SLinus Torvalds #include <linux/fs.h> 51da177e4SLinus Torvalds #include <linux/string.h> 61da177e4SLinus Torvalds #include <linux/kernel.h> 71da177e4SLinus Torvalds 81da177e4SLinus Torvalds #if 0 91da177e4SLinus Torvalds #define DEBUGP printk 101da177e4SLinus Torvalds #else 111da177e4SLinus Torvalds #define DEBUGP(fmt...) 121da177e4SLinus Torvalds #endif 131da177e4SLinus Torvalds 141da177e4SLinus Torvalds void *module_alloc(unsigned long size) 151da177e4SLinus Torvalds { 161da177e4SLinus Torvalds if (size == 0) 171da177e4SLinus Torvalds return NULL; 181da177e4SLinus Torvalds return vmalloc(size); 191da177e4SLinus Torvalds } 201da177e4SLinus Torvalds 211da177e4SLinus Torvalds 221da177e4SLinus Torvalds /* Free memory returned from module_alloc */ 231da177e4SLinus Torvalds void module_free(struct module *mod, void *module_region) 241da177e4SLinus Torvalds { 251da177e4SLinus Torvalds vfree(module_region); 261da177e4SLinus Torvalds /* FIXME: If module_region == mod->init_region, trim exception 271da177e4SLinus Torvalds table entries. */ 281da177e4SLinus Torvalds } 291da177e4SLinus Torvalds 301da177e4SLinus Torvalds /* We don't need anything special. */ 311da177e4SLinus Torvalds int module_frob_arch_sections(Elf_Ehdr *hdr, 321da177e4SLinus Torvalds Elf_Shdr *sechdrs, 331da177e4SLinus Torvalds char *secstrings, 341da177e4SLinus Torvalds struct module *mod) 351da177e4SLinus Torvalds { 361da177e4SLinus Torvalds return 0; 371da177e4SLinus Torvalds } 381da177e4SLinus Torvalds 391da177e4SLinus Torvalds int apply_relocate(Elf32_Shdr *sechdrs, 401da177e4SLinus Torvalds const char *strtab, 411da177e4SLinus Torvalds unsigned int symindex, 421da177e4SLinus Torvalds unsigned int relsec, 431da177e4SLinus Torvalds struct module *me) 441da177e4SLinus Torvalds { 451da177e4SLinus Torvalds unsigned int i; 461da177e4SLinus Torvalds Elf32_Rel *rel = (void *)sechdrs[relsec].sh_addr; 471da177e4SLinus Torvalds Elf32_Sym *sym; 481da177e4SLinus Torvalds uint32_t *location; 491da177e4SLinus Torvalds 501da177e4SLinus Torvalds DEBUGP("Applying relocate section %u to %u\n", relsec, 511da177e4SLinus Torvalds sechdrs[relsec].sh_info); 521da177e4SLinus Torvalds for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 531da177e4SLinus Torvalds /* This is where to make the change */ 541da177e4SLinus Torvalds location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr 551da177e4SLinus Torvalds + rel[i].r_offset; 561da177e4SLinus Torvalds /* This is the symbol it is referring to. Note that all 571da177e4SLinus Torvalds undefined symbols have been resolved. */ 581da177e4SLinus Torvalds sym = (Elf32_Sym *)sechdrs[symindex].sh_addr 591da177e4SLinus Torvalds + ELF32_R_SYM(rel[i].r_info); 601da177e4SLinus Torvalds 611da177e4SLinus Torvalds switch (ELF32_R_TYPE(rel[i].r_info)) { 621da177e4SLinus Torvalds case R_68K_32: 631da177e4SLinus Torvalds /* We add the value into the location given */ 641da177e4SLinus Torvalds *location += sym->st_value; 651da177e4SLinus Torvalds break; 661da177e4SLinus Torvalds case R_68K_PC32: 671da177e4SLinus Torvalds /* Add the value, subtract its postition */ 681da177e4SLinus Torvalds *location += sym->st_value - (uint32_t)location; 691da177e4SLinus Torvalds break; 701da177e4SLinus Torvalds default: 711da177e4SLinus Torvalds printk(KERN_ERR "module %s: Unknown relocation: %u\n", 721da177e4SLinus Torvalds me->name, ELF32_R_TYPE(rel[i].r_info)); 731da177e4SLinus Torvalds return -ENOEXEC; 741da177e4SLinus Torvalds } 751da177e4SLinus Torvalds } 761da177e4SLinus Torvalds return 0; 771da177e4SLinus Torvalds } 781da177e4SLinus Torvalds 791da177e4SLinus Torvalds int apply_relocate_add(Elf32_Shdr *sechdrs, 801da177e4SLinus Torvalds const char *strtab, 811da177e4SLinus Torvalds unsigned int symindex, 821da177e4SLinus Torvalds unsigned int relsec, 831da177e4SLinus Torvalds struct module *me) 841da177e4SLinus Torvalds { 851da177e4SLinus Torvalds unsigned int i; 861da177e4SLinus Torvalds Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr; 871da177e4SLinus Torvalds Elf32_Sym *sym; 881da177e4SLinus Torvalds uint32_t *location; 891da177e4SLinus Torvalds 901da177e4SLinus Torvalds DEBUGP("Applying relocate_add section %u to %u\n", relsec, 911da177e4SLinus Torvalds sechdrs[relsec].sh_info); 921da177e4SLinus Torvalds for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) { 931da177e4SLinus Torvalds /* This is where to make the change */ 941da177e4SLinus Torvalds location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr 951da177e4SLinus Torvalds + rel[i].r_offset; 961da177e4SLinus Torvalds /* This is the symbol it is referring to. Note that all 971da177e4SLinus Torvalds undefined symbols have been resolved. */ 981da177e4SLinus Torvalds sym = (Elf32_Sym *)sechdrs[symindex].sh_addr 991da177e4SLinus Torvalds + ELF32_R_SYM(rel[i].r_info); 1001da177e4SLinus Torvalds 1011da177e4SLinus Torvalds switch (ELF32_R_TYPE(rel[i].r_info)) { 1021da177e4SLinus Torvalds case R_68K_32: 1031da177e4SLinus Torvalds /* We add the value into the location given */ 1041da177e4SLinus Torvalds *location = rel[i].r_addend + sym->st_value; 1051da177e4SLinus Torvalds break; 1061da177e4SLinus Torvalds case R_68K_PC32: 1071da177e4SLinus Torvalds /* Add the value, subtract its postition */ 1081da177e4SLinus Torvalds *location = rel[i].r_addend + sym->st_value - (uint32_t)location; 1091da177e4SLinus Torvalds break; 1101da177e4SLinus Torvalds default: 1111da177e4SLinus Torvalds printk(KERN_ERR "module %s: Unknown relocation: %u\n", 1121da177e4SLinus Torvalds me->name, ELF32_R_TYPE(rel[i].r_info)); 1131da177e4SLinus Torvalds return -ENOEXEC; 1141da177e4SLinus Torvalds } 1151da177e4SLinus Torvalds } 1161da177e4SLinus Torvalds return 0; 1171da177e4SLinus Torvalds } 1181da177e4SLinus Torvalds 1191da177e4SLinus Torvalds int module_finalize(const Elf_Ehdr *hdr, 1201da177e4SLinus Torvalds const Elf_Shdr *sechdrs, 1211da177e4SLinus Torvalds struct module *me) 1221da177e4SLinus Torvalds { 1231da177e4SLinus Torvalds return 0; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds void module_arch_cleanup(struct module *mod) 1271da177e4SLinus Torvalds { 1281da177e4SLinus Torvalds } 129