LXR linux/arch/unicore32/kernel/module.c

   1/*
   2 * linux/arch/unicore32/kernel/module.c
   3 *
   4 * Code specific to PKUnity SoC and UniCore ISA
   5 *
   6 * Copyright (C) 2001-2010 GUAN Xue-tao
   7 *
   8 * This program is free software; you can redistribute it and/or modify
   9 * it under the terms of the GNU General Public License version 2 as
  10 * published by the Free Software Foundation.
  11 */
  12#include <linux/module.h>
  13#include <linux/moduleloader.h>
  14#include <linux/kernel.h>
  15#include <linux/mm.h>
  16#include <linux/elf.h>
  17#include <linux/vmalloc.h>
  18#include <linux/fs.h>
  19#include <linux/string.h>
  20#include <linux/gfp.h>
  21
  22#include <asm/pgtable.h>
  23#include <asm/sections.h>
  24
  25void *module_alloc(unsigned long size)
  26{
  27        return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
  28                                GFP_KERNEL, PAGE_KERNEL_EXEC, NUMA_NO_NODE,
  29                                __builtin_return_address(0));
  30}
  31
  32int
  33apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
  34               unsigned int relindex, struct module *module)
  35{
  36        Elf32_Shdr *symsec = sechdrs + symindex;
  37        Elf32_Shdr *relsec = sechdrs + relindex;
  38        Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
  39        Elf32_Rel *rel = (void *)relsec->sh_addr;
  40        unsigned int i;
  41
  42        for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
  43                unsigned long loc;
  44                Elf32_Sym *sym;
  45                s32 offset;
  46
  47                offset = ELF32_R_SYM(rel->r_info);
  48                if (offset < 0 || offset >
  49                                (symsec->sh_size / sizeof(Elf32_Sym))) {
  50                        printk(KERN_ERR "%s: bad relocation, "
  51                                        "section %d reloc %d\n",
  52                                        module->name, relindex, i);
  53                        return -ENOEXEC;
  54                }
  55
  56                sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
  57
  58                if (rel->r_offset < 0 || rel->r_offset >
  59                                dstsec->sh_size - sizeof(u32)) {
  60                        printk(KERN_ERR "%s: out of bounds relocation, "
  61                                "section %d reloc %d offset %d size %d\n",
  62                                module->name, relindex, i, rel->r_offset,
  63                                dstsec->sh_size);
  64                        return -ENOEXEC;
  65                }
  66
  67                loc = dstsec->sh_addr + rel->r_offset;
  68
  69                switch (ELF32_R_TYPE(rel->r_info)) {
  70                case R_UNICORE_NONE:
  71                        /* ignore */
  72                        break;
  73
  74                case R_UNICORE_ABS32:
  75                        *(u32 *)loc += sym->st_value;
  76                        break;
  77
  78                case R_UNICORE_PC24:
  79                case R_UNICORE_CALL:
  80                case R_UNICORE_JUMP24:
  81                        offset = (*(u32 *)loc & 0x00ffffff) << 2;
  82                        if (offset & 0x02000000)
  83                                offset -= 0x04000000;
  84
  85                        offset += sym->st_value - loc;
  86                        if (offset & 3 ||
  87                            offset <= (s32)0xfe000000 ||
  88                            offset >= (s32)0x02000000) {
  89                                printk(KERN_ERR
  90                                       "%s: relocation out of range, section "
  91                                       "%d reloc %d sym '%s'\n", module->name,
  92                                       relindex, i, strtab + sym->st_name);
  93                                return -ENOEXEC;
  94                        }
  95
  96                        offset >>= 2;
  97
  98                        *(u32 *)loc &= 0xff000000;
  99                        *(u32 *)loc |= offset & 0x00ffffff;
 100                        break;
 101
 102                default:
 103                        printk(KERN_ERR "%s: unknown relocation: %u\n",
 104                               module->name, ELF32_R_TYPE(rel->r_info));
 105                        return -ENOEXEC;
 106                }
 107        }
 108        return 0;
 109}
 110