| /* |
| * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu> |
| * Copyright (C) 2007-2009 PetaLogix |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #include <linux/module.h> |
| #include <linux/moduleloader.h> |
| #include <linux/kernel.h> |
| #include <linux/elf.h> |
| #include <linux/vmalloc.h> |
| #include <linux/fs.h> |
| #include <linux/string.h> |
| |
| #include <asm/pgtable.h> |
| #include <asm/cacheflush.h> |
| |
| int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab, |
| unsigned int symindex, unsigned int relsec, struct module *module) |
| { |
| |
| unsigned int i; |
| Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr; |
| Elf32_Sym *sym; |
| unsigned long int *location; |
| unsigned long int value; |
| #if __GNUC__ < 4 |
| unsigned long int old_value; |
| #endif |
| |
| pr_debug("Applying add relocation section %u to %u\n", |
| relsec, sechdrs[relsec].sh_info); |
| |
| for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) { |
| |
| location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr + |
| rela[i].r_offset; |
| sym = (Elf32_Sym *)sechdrs[symindex].sh_addr + |
| ELF32_R_SYM(rela[i].r_info); |
| value = sym->st_value + rela[i].r_addend; |
| |
| switch (ELF32_R_TYPE(rela[i].r_info)) { |
| |
| /* |
| * Be careful! mb-gcc / mb-ld splits the relocs between the |
| * text and the reloc table. In general this means we must |
| * read the current contents of (*location), add any offset |
| * then store the result back in |
| */ |
| |
| case R_MICROBLAZE_32: |
| #if __GNUC__ < 4 |
| old_value = *location; |
| *location = value + old_value; |
| |
| pr_debug("R_MICROBLAZE_32 (%08lx->%08lx)\n", |
| old_value, value); |
| #else |
| *location = value; |
| #endif |
| break; |
| |
| case R_MICROBLAZE_64: |
| #if __GNUC__ < 4 |
| /* Split relocs only required/used pre gcc4.1.1 */ |
| old_value = ((location[0] & 0x0000FFFF) << 16) | |
| (location[1] & 0x0000FFFF); |
| value += old_value; |
| #endif |
| location[0] = (location[0] & 0xFFFF0000) | |
| (value >> 16); |
| location[1] = (location[1] & 0xFFFF0000) | |
| (value & 0xFFFF); |
| #if __GNUC__ < 4 |
| pr_debug("R_MICROBLAZE_64 (%08lx->%08lx)\n", |
| old_value, value); |
| #endif |
| break; |
| |
| case R_MICROBLAZE_64_PCREL: |
| #if __GNUC__ < 4 |
| old_value = (location[0] & 0xFFFF) << 16 | |
| (location[1] & 0xFFFF); |
| value -= old_value; |
| #endif |
| value -= (unsigned long int)(location) + 4; |
| location[0] = (location[0] & 0xFFFF0000) | |
| (value >> 16); |
| location[1] = (location[1] & 0xFFFF0000) | |
| (value & 0xFFFF); |
| pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n", |
| value); |
| break; |
| |
| case R_MICROBLAZE_32_PCREL_LO: |
| pr_debug("R_MICROBLAZE_32_PCREL_LO\n"); |
| break; |
| |
| case R_MICROBLAZE_64_NONE: |
| pr_debug("R_MICROBLAZE_64_NONE\n"); |
| break; |
| |
| case R_MICROBLAZE_NONE: |
| pr_debug("R_MICROBLAZE_NONE\n"); |
| break; |
| |
| default: |
| pr_err("module %s: Unknown relocation: %u\n", |
| module->name, |
| ELF32_R_TYPE(rela[i].r_info)); |
| return -ENOEXEC; |
| } |
| } |
| return 0; |
| } |
| |
| int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs, |
| struct module *module) |
| { |
| flush_dcache(); |
| return 0; |
| } |