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- /* MN10300 Kernel module helper routines
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by Mark Salter (msalter@redhat.com)
- * - Derived from arch/i386/kernel/module.c
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public Licence as published by
- * the Free Software Foundation; either version 2 of the Licence, 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 Licence for more details.
- *
- * You should have received a copy of the GNU General Public Licence
- * 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>
- #include <linux/bug.h>
- #if 0
- #define DEBUGP printk
- #else
- #define DEBUGP(fmt, ...)
- #endif
- /*
- * allocate storage for a module
- */
- void *module_alloc(unsigned long size)
- {
- if (size == 0)
- return NULL;
- return vmalloc_exec(size);
- }
- /*
- * free memory returned from module_alloc()
- */
- void module_free(struct module *mod, void *module_region)
- {
- vfree(module_region);
- /* FIXME: If module_region == mod->init_region, trim exception
- * table entries. */
- }
- /*
- * allow the arch to fix up the section table
- * - we don't need anything special
- */
- int module_frob_arch_sections(Elf_Ehdr *hdr,
- Elf_Shdr *sechdrs,
- char *secstrings,
- struct module *mod)
- {
- return 0;
- }
- static uint32_t reloc_get16(uint8_t *p)
- {
- return p[0] | (p[1] << 8);
- }
- static uint32_t reloc_get24(uint8_t *p)
- {
- return reloc_get16(p) | (p[2] << 16);
- }
- static uint32_t reloc_get32(uint8_t *p)
- {
- return reloc_get16(p) | (reloc_get16(p+2) << 16);
- }
- static void reloc_put16(uint8_t *p, uint32_t val)
- {
- p[0] = val & 0xff;
- p[1] = (val >> 8) & 0xff;
- }
- static void reloc_put24(uint8_t *p, uint32_t val)
- {
- reloc_put16(p, val);
- p[2] = (val >> 16) & 0xff;
- }
- static void reloc_put32(uint8_t *p, uint32_t val)
- {
- reloc_put16(p, val);
- reloc_put16(p+2, val >> 16);
- }
- /*
- * apply a REL relocation
- */
- 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;
- }
- /*
- * apply a RELA relocation
- */
- 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;
- Elf32_Addr relocation;
- uint8_t *location;
- uint32_t value;
- 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 the relocation is referring to (note that
- * all undefined symbols have been resolved by the caller) */
- sym = (Elf32_Sym *)sechdrs[symindex].sh_addr
- + ELF32_R_SYM(rel[i].r_info);
- /* this is the adjustment to be made */
- relocation = sym->st_value + rel[i].r_addend;
- switch (ELF32_R_TYPE(rel[i].r_info)) {
- /* for the first four relocation types, we add the
- * adjustment into the value at the location given */
- case R_MN10300_32:
- value = reloc_get32(location);
- value += relocation;
- reloc_put32(location, value);
- break;
- case R_MN10300_24:
- value = reloc_get24(location);
- value += relocation;
- reloc_put24(location, value);
- break;
- case R_MN10300_16:
- value = reloc_get16(location);
- value += relocation;
- reloc_put16(location, value);
- break;
- case R_MN10300_8:
- *location += relocation;
- break;
- /* for the next three relocation types, we write the
- * adjustment with the address subtracted over the
- * value at the location given */
- case R_MN10300_PCREL32:
- value = relocation - (uint32_t) location;
- reloc_put32(location, value);
- break;
- case R_MN10300_PCREL16:
- value = relocation - (uint32_t) location;
- reloc_put16(location, value);
- break;
- case R_MN10300_PCREL8:
- *location = relocation - (uint32_t) location;
- break;
- default:
- printk(KERN_ERR "module %s: Unknown relocation: %u\n",
- me->name, ELF32_R_TYPE(rel[i].r_info));
- return -ENOEXEC;
- }
- }
- return 0;
- }
- /*
- * finish loading the module
- */
- int module_finalize(const Elf_Ehdr *hdr,
- const Elf_Shdr *sechdrs,
- struct module *me)
- {
- return module_bug_finalize(hdr, sechdrs, me);
- }
- /*
- * finish clearing the module
- */
- void module_arch_cleanup(struct module *mod)
- {
- module_bug_cleanup(mod);
- }
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