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         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
  40 void module_free(struct module *module, void *region)
  41 {
  42         vfree(region);
  43 }
  44
  45 int module_frob_arch_sections(Elf_Ehdr *hdr,
  46                               Elf_Shdr *sechdrs,
  47                               char *secstrings,
  48                               struct module *mod)
  49 {
  50         return 0;
  51 }
  52
  53 int
  54 apply_relocate(Elf32_Shdr *sechdrs, const char *strtab, unsigned int symindex,
  55                unsigned int relindex, struct module *module)
  56 {
  57         Elf32_Shdr *symsec = sechdrs + symindex;
  58         Elf32_Shdr *relsec = sechdrs + relindex;
  59         Elf32_Shdr *dstsec = sechdrs + relsec->sh_info;
  60         Elf32_Rel *rel = (void *)relsec->sh_addr;
  61         unsigned int i;
  62
  63         for (i = 0; i < relsec->sh_size / sizeof(Elf32_Rel); i++, rel++) {
  64                 unsigned long loc;
  65                 Elf32_Sym *sym;
  66                 s32 offset;
  67
  68                 offset = ELF32_R_SYM(rel->r_info);
  69                 if (offset < 0 || offset >
  70                                 (symsec->sh_size / sizeof(Elf32_Sym))) {
  71                         printk(KERN_ERR "%s: bad relocation, "
  72                                         "section %d reloc %d\n",
  73                                         module->name, relindex, i);
  74                         return -ENOEXEC;
  75                 }
  76
  77                 sym = ((Elf32_Sym *)symsec->sh_addr) + offset;
  78
  79                 if (rel->r_offset < 0 || rel->r_offset >
  80                                 dstsec->sh_size - sizeof(u32)) {
  81                         printk(KERN_ERR "%s: out of bounds relocation, "
  82                                 "section %d reloc %d offset %d size %d\n",
  83                                 module->name, relindex, i, rel->r_offset,
  84                                 dstsec->sh_size);
  85                         return -ENOEXEC;
  86                 }
  87
  88                 loc = dstsec->sh_addr + rel->r_offset;
  89
  90                 switch (ELF32_R_TYPE(rel->r_info)) {
  91                 case R_UNICORE_NONE:
  92                         /* ignore */
  93                         break;
  94
  95                 case R_UNICORE_ABS32:
  96                         *(u32 *)loc += sym->st_value;
  97                         break;
  98
  99                 case R_UNICORE_PC24:
 100                 case R_UNICORE_CALL:
 101                 case R_UNICORE_JUMP24:
 102                         offset = (*(u32 *)loc & 0x00ffffff) << 2;
 103                         if (offset & 0x02000000)
 104                                 offset -= 0x04000000;
 105
 106                         offset += sym->st_value - loc;
 107                         if (offset & 3 ||
 108                             offset <= (s32)0xfe000000 ||
 109                             offset >= (s32)0x02000000) {
 110                                 printk(KERN_ERR
 111                                        "%s: relocation out of range, section "
 112                                        "%d reloc %d sym '%s'\n", module->name,
 113                                        relindex, i, strtab + sym->st_name);
 114                                 return -ENOEXEC;
 115                         }
 116
 117                         offset >>= 2;
 118
 119                         *(u32 *)loc &= 0xff000000;
 120                         *(u32 *)loc |= offset & 0x00ffffff;
 121                         break;
 122
 123                 default:
 124                         printk(KERN_ERR "%s: unknown relocation: %u\n",
 125                                module->name, ELF32_R_TYPE(rel->r_info));
 126                         return -ENOEXEC;
 127                 }
 128         }
 129         return 0;
 130 }
 131
 132 int
 133 apply_relocate_add(Elf32_Shdr *sechdrs, const char *strtab,
 134                    unsigned int symindex, unsigned int relsec,
 135                    struct module *module)
 136 {
 137         printk(KERN_ERR "module %s: ADD RELOCATION unsupported\n",
 138                module->name);
 139         return -ENOEXEC;
 140 }
 141
 142 int
 143 module_finalize(const Elf32_Ehdr *hdr, const Elf_Shdr *sechdrs,
 144                 struct module *module)
 145 {
 146         return 0;
 147 }
 148
 149 void
 150 module_arch_cleanup(struct module *mod)
 151 {
 152 }