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