LXR linux/arch/microblaze/kernel/module.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2007-2009 Michal Simek <monstr@monstr.eu>
   4 * Copyright (C) 2007-2009 PetaLogix
   5 */
   6
   7#include <linux/export.h>
   8#include <linux/moduleloader.h>
   9#include <linux/kernel.h>
  10#include <linux/elf.h>
  11#include <linux/vmalloc.h>
  12#include <linux/fs.h>
  13#include <linux/string.h>
  14#include <linux/pgtable.h>
  15
  16#include <asm/cacheflush.h>
  17
  18int apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
  19        unsigned int symindex, unsigned int relsec, struct module *module)
  20{
  21
  22        unsigned int i;
  23        Elf32_Rela *rela = (void *)sechdrs[relsec].sh_addr;
  24        Elf32_Sym *sym;
  25        unsigned long int *location;
  26        unsigned long int value;
  27
  28        pr_debug("Applying add relocation section %u to %u\n",
  29                relsec, sechdrs[relsec].sh_info);
  30
  31        for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rela); i++) {
  32
  33                location = (void *)sechdrs[sechdrs[relsec].sh_info].sh_addr +
  34                                rela[i].r_offset;
  35                sym = (Elf32_Sym *)sechdrs[symindex].sh_addr +
  36                        ELF32_R_SYM(rela[i].r_info);
  37                value = sym->st_value + rela[i].r_addend;
  38
  39                switch (ELF32_R_TYPE(rela[i].r_info)) {
  40
  41                /*
  42                 * Be careful! mb-gcc / mb-ld splits the relocs between the
  43                 * text and the reloc table. In general this means we must
  44                 * read the current contents of (*location), add any offset
  45                 * then store the result back in
  46                 */
  47
  48                case R_MICROBLAZE_32:
  49                        *location = value;
  50                        break;
  51
  52                case R_MICROBLAZE_64:
  53                        location[0] = (location[0] & 0xFFFF0000) |
  54                                        (value >> 16);
  55                        location[1] = (location[1] & 0xFFFF0000) |
  56                                        (value & 0xFFFF);
  57                        break;
  58
  59                case R_MICROBLAZE_64_PCREL:
  60                        value -= (unsigned long int)(location) + 4;
  61                        location[0] = (location[0] & 0xFFFF0000) |
  62                                        (value >> 16);
  63                        location[1] = (location[1] & 0xFFFF0000) |
  64                                        (value & 0xFFFF);
  65                        pr_debug("R_MICROBLAZE_64_PCREL (%08lx)\n",
  66                                value);
  67                        break;
  68
  69                case R_MICROBLAZE_32_PCREL_LO:
  70                        pr_debug("R_MICROBLAZE_32_PCREL_LO\n");
  71                        break;
  72
  73                case R_MICROBLAZE_64_NONE:
  74                        pr_debug("R_MICROBLAZE_64_NONE\n");
  75                        break;
  76
  77                case R_MICROBLAZE_NONE:
  78                        pr_debug("R_MICROBLAZE_NONE\n");
  79                        break;
  80
  81                default:
  82                        pr_err("module %s: Unknown relocation: %u\n",
  83                                module->name,
  84                                ELF32_R_TYPE(rela[i].r_info));
  85                        return -ENOEXEC;
  86                }
  87        }
  88        return 0;
  89}
  90
  91int module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
  92                struct module *module)
  93{
  94        flush_dcache();
  95        return 0;
  96}
  97