arch/sparc/kernel/module.c

   1 /* Kernel module help for sparc64.
   2  *
   3  * Copyright (C) 2001 Rusty Russell.
   4  * Copyright (C) 2002 David S. Miller.
   5  */
   6
   7 #include <linux/moduleloader.h>
   8 #include <linux/kernel.h>
   9 #include <linux/elf.h>
  10 #include <linux/vmalloc.h>
  11 #include <linux/fs.h>
  12 #include <linux/string.h>
  13 #include <linux/ctype.h>
  14 #include <linux/slab.h>
  15 #include <linux/mm.h>
  16
  17 #include <asm/processor.h>
  18 #include <asm/spitfire.h>
  19
  20 #ifdef CONFIG_SPARC64
  21 static void *module_map(unsigned long size)
  22 {
  23         struct vm_struct *area;
  24
  25         size = PAGE_ALIGN(size);
  26         if (!size || size > MODULES_LEN)
  27                 return NULL;
  28
  29         area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
  30         if (!area)
  31                 return NULL;
  32
  33         return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
  34 }
  35
  36 static char *dot2underscore(char *name)
  37 {
  38         return name;
  39 }
  40 #else
  41 static void *module_map(unsigned long size)
  42 {
  43         return vmalloc(size);
  44 }
  45
  46 /* Replace references to .func with _Func */
  47 static char *dot2underscore(char *name)
  48 {
  49         if (name[0] == '.') {
  50                 name[0] = '_';
  51                 name[1] = toupper(name[1]);
  52         }
  53         return name;
  54 }
  55 #endif /* CONFIG_SPARC64 */
  56
  57 void *module_alloc(unsigned long size)
  58 {
  59         void *ret;
  60
  61         /* We handle the zero case fine, unlike vmalloc */
  62         if (size == 0)
  63                 return NULL;
  64
  65         ret = module_map(size);
  66         if (!ret)
  67                 ret = ERR_PTR(-ENOMEM);
  68         else
  69                 memset(ret, 0, size);
  70
  71         return ret;
  72 }
  73
  74 /* Free memory returned from module_core_alloc/module_init_alloc */
  75 void module_free(struct module *mod, void *module_region)
  76 {
  77         vfree(module_region);
  78         /* FIXME: If module_region == mod->init_region, trim exception
  79            table entries. */
  80 }
  81
  82 /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
  83 int module_frob_arch_sections(Elf_Ehdr *hdr,
  84                               Elf_Shdr *sechdrs,
  85                               char *secstrings,
  86                               struct module *mod)
  87 {
  88         unsigned int symidx;
  89         Elf_Sym *sym;
  90         char *strtab;
  91         int i;
  92
  93         for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
  94                 if (symidx == hdr->e_shnum-1) {
  95                         printk("%s: no symtab found.\n", mod->name);
  96                         return -ENOEXEC;
  97                 }
  98         }
  99         sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
 100         strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
 101
 102         for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
 103                 if (sym[i].st_shndx == SHN_UNDEF) {
 104                         if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) {
 105                                 sym[i].st_shndx = SHN_ABS;
 106                         } else {
 107                                 char *name = strtab + sym[i].st_name;
 108                                 dot2underscore(name);
 109                         }
 110                 }
 111         }
 112         return 0;
 113 }
 114
 115 int apply_relocate(Elf_Shdr *sechdrs,
 116                    const char *strtab,
 117                    unsigned int symindex,
 118                    unsigned int relsec,
 119                    struct module *me)
 120 {
 121         printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
 122                me->name);
 123         return -ENOEXEC;
 124 }
 125
 126 int apply_relocate_add(Elf_Shdr *sechdrs,
 127                        const char *strtab,
 128                        unsigned int symindex,
 129                        unsigned int relsec,
 130                        struct module *me)
 131 {
 132         unsigned int i;
 133         Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 134         Elf_Sym *sym;
 135         u8 *location;
 136         u32 *loc32;
 137
 138         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 139                 Elf_Addr v;
 140
 141                 /* This is where to make the change */
 142                 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 143                         + rel[i].r_offset;
 144                 loc32 = (u32 *) location;
 145
 146 #ifdef CONFIG_SPARC64
 147                 BUG_ON(((u64)location >> (u64)32) != (u64)0);
 148 #endif /* CONFIG_SPARC64 */
 149
 150                 /* This is the symbol it is referring to.  Note that all
 151                    undefined symbols have been resolved.  */
 152                 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
 153                         + ELF_R_SYM(rel[i].r_info);
 154                 v = sym->st_value + rel[i].r_addend;
 155
 156                 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
 157 #ifdef CONFIG_SPARC64
 158                 case R_SPARC_64:
 159                         location[0] = v >> 56;
 160                         location[1] = v >> 48;
 161                         location[2] = v >> 40;
 162                         location[3] = v >> 32;
 163                         location[4] = v >> 24;
 164                         location[5] = v >> 16;
 165                         location[6] = v >>  8;
 166                         location[7] = v >>  0;
 167                         break;
 168
 169                 case R_SPARC_DISP32:
 170                         v -= (Elf_Addr) location;
 171                         *loc32 = v;
 172                         break;
 173
 174                 case R_SPARC_WDISP19:
 175                         v -= (Elf_Addr) location;
 176                         *loc32 = (*loc32 & ~0x7ffff) |
 177                                 ((v >> 2) & 0x7ffff);
 178                         break;
 179
 180                 case R_SPARC_OLO10:
 181                         *loc32 = (*loc32 & ~0x1fff) |
 182                                 (((v & 0x3ff) +
 183                                   (ELF_R_TYPE(rel[i].r_info) >> 8))
 184                                  & 0x1fff);
 185                         break;
 186 #endif /* CONFIG_SPARC64 */
 187
 188                 case R_SPARC_32:
 189                 case R_SPARC_UA32:
 190                         location[0] = v >> 24;
 191                         location[1] = v >> 16;
 192                         location[2] = v >>  8;
 193                         location[3] = v >>  0;
 194                         break;
 195
 196                 case R_SPARC_WDISP30:
 197                         v -= (Elf_Addr) location;
 198                         *loc32 = (*loc32 & ~0x3fffffff) |
 199                                 ((v >> 2) & 0x3fffffff);
 200                         break;
 201
 202                 case R_SPARC_WDISP22:
 203                         v -= (Elf_Addr) location;
 204                         *loc32 = (*loc32 & ~0x3fffff) |
 205                                 ((v >> 2) & 0x3fffff);
 206                         break;
 207
 208                 case R_SPARC_LO10:
 209                         *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
 210                         break;
 211
 212                 case R_SPARC_HI22:
 213                         *loc32 = (*loc32 & ~0x3fffff) |
 214                                 ((v >> 10) & 0x3fffff);
 215                         break;
 216
 217                 default:
 218                         printk(KERN_ERR "module %s: Unknown relocation: %x\n",
 219                                me->name,
 220                                (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
 221                         return -ENOEXEC;
 222                 };
 223         }
 224         return 0;
 225 }
 226
 227 #ifdef CONFIG_SPARC64
 228 int module_finalize(const Elf_Ehdr *hdr,
 229                     const Elf_Shdr *sechdrs,
 230                     struct module *me)
 231 {
 232         /* Cheetah's I-cache is fully coherent.  */
 233         if (tlb_type == spitfire) {
 234                 unsigned long va;
 235
 236                 flushw_all();
 237                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 238                         spitfire_put_icache_tag(va, 0x0);
 239                 __asm__ __volatile__("flush %g6");
 240         }
 241
 242         return 0;
 243 }
 244 #else
 245 int module_finalize(const Elf_Ehdr *hdr,
 246                     const Elf_Shdr *sechdrs,
 247                     struct module *me)
 248 {
 249         return 0;
 250 }
 251 #endif /* CONFIG_SPARC64 */
 252
 253 void module_arch_cleanup(struct module *mod)
 254 {
 255 }