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        struct vm_struct *area;
  28
  29        size = PAGE_ALIGN(size);
  30        if (!size)
  31                return NULL;
  32
  33        area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
  34        if (!area)
  35                return NULL;
  36
  37        return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL_EXEC);
  38}
  39
  40int
  41apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
  42               unsigned int relindex, struct module *module)
  43{
  44        Elf32_Shdr *symsec = sechdrs + symindex;
  45        Elf32_Shdr *relsec = sechdrs + relindex;
  46        Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
  47        Elf32_Rel *rel = (void *)relsec->sh_addr;
  48        unsigned int i;
  49
  50        for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
  51                unsigned long loc;
  52                Elf32_Sym *sym;
  53                s32 offset;
  54
  55                offset = ELF32_R_SYM(rel->r_info);
  56                if (offset < 0 || offset >
  57                                (symsec->sh_size / sizeof(Elf32_Sym))) {
  58                        printk(KERN_ERR "%s: bad relocation, "
  59                                        "section %d reloc %d\n",
  60                                        module->name, relindex, i);
  61                        return -ENOEXEC;
  62                }
  63
  64                sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
  65
  66                if (rel->r_offset < 0 || rel->r_offset >
  67                                dstsec->sh_size - sizeof(u32)) {
  68                        printk(KERN_ERR "%s: out of bounds relocation, "
  69                                "section %d reloc %d offset %d size %d\n",
  70                                module->name, relindex, i, rel->r_offset,
  71                                dstsec->sh_size);
  72                        return -ENOEXEC;
  73                }
  74
  75                loc = dstsec->sh_addr + rel->r_offset;
  76
  77                switch (ELF32_R_TYPE(rel->r_info)) {
  78                case R_UNICORE_NONE:
  79                        /* ignore */
  80                        break;
  81
  82                case R_UNICORE_ABS32:
  83                        *(u32 *)loc += sym->st_value;
  84                        break;
  85
  86                case R_UNICORE_PC24:
  87                case R_UNICORE_CALL:
  88                case R_UNICORE_JUMP24:
  89                        offset = (*(u32 *)loc & 0x00ffffff) << 2;
  90                        if (offset & 0x02000000)
  91                                offset -= 0x04000000;
  92
  93                        offset += sym->st_value - loc;
  94                        if (offset & 3 ||
  95                            offset <= (s32)0xfe000000 ||
  96                            offset >= (s32)0x02000000) {
  97                                printk(KERN_ERR
  98                                       "%s: relocation out of range, section "
  99                                       "%d reloc %d sym '%s'\n", module->name,
 100                                       relindex, i, strtab + sym->st_name);
 101                                return -ENOEXEC;
 102                        }
 103
 104                        offset >>= 2;
 105
 106                        *(u32 *)loc &= 0xff000000;
 107                        *(u32 *)loc |= offset & 0x00ffffff;
 108                        break;
 109
 110                default:
 111                        printk(KERN_ERR "%s: unknown relocation: %u\n",
 112                               module->name, ELF32_R_TYPE(rel->r_info));
 113                        return -ENOEXEC;
 114                }
 115        }
 116        return 0;
 117}
 118