126 lines
3 KiB
C
126 lines
3 KiB
C
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/*
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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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