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