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
  25 void *module_alloc(unsigned long size)
  26 {
  27         return __vmalloc_node_range(size, 1, MODULES_VADDR, MODULES_END,
  28                                 GFP_KERNEL, PAGE_KERNEL_EXEC, 0, NUMA_NO_NODE,
  29                                 __builtin_return_address(0));
  30 }
  31
  32 int
  33 apply_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 }