/* Kernel module help for i386. Copyright (C) 2001 Rusty Russell. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #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 #ifdef CONFIG_ETRAX_KMALLOCED_MODULES #define MALLOC_MODULE(size) kmalloc(size, GFP_KERNEL) #define FREE_MODULE(region) kfree(region) #else #define MALLOC_MODULE(size) vmalloc_exec(size) #define FREE_MODULE(region) vfree(region) #endif void *module_alloc(unsigned long size) { if (size == 0) return NULL; return MALLOC_MODULE(size); } /* Free memory returned from module_alloc */ void module_free(struct module *mod, void *module_region) { FREE_MODULE(module_region); /* FIXME: If module_region == mod->init_region, trim exception table entries. */ } /* 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: REL 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 add 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 = ((void *)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)); switch (ELF32_R_TYPE(rela[i].r_info)) { case R_CRIS_32: *loc = sym->st_value + rela[i].r_addend; break; case R_CRIS_32_PCREL: *loc = sym->st_value - (unsigned)loc + rela[i].r_addend - 4; break; default: printk(KERN_ERR "module %s: Unknown relocation: %u\n", me->name, ELF32_R_TYPE(rela[i].r_info)); return -ENOEXEC; } } return 0; } int module_finalize(const Elf_Ehdr *hdr, const Elf_Shdr *sechdrs, struct module *me) { return 0; } void module_arch_cleanup(struct module *mod) { }