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 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 }
  79
  80 /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
  81 int module_frob_arch_sections(Elf_Ehdr *hdr,
  82                               Elf_Shdr *sechdrs,
  83                               char *secstrings,
  84                               struct module *mod)
  85 {
  86         unsigned int symidx;
  87         Elf_Sym *sym;
  88         char *strtab;
  89         int i;
  90
  91         for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
  92                 if (symidx == hdr->e_shnum-1) {
  93                         printk("%s: no symtab found.\n", mod->name);
  94                         return -ENOEXEC;
  95                 }
  96         }
  97         sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
  98         strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
  99
 100         for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
 101                 if (sym[i].st_shndx == SHN_UNDEF) {
 102                         if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) {
 103                                 sym[i].st_shndx = SHN_ABS;
 104                         } else {
 105                                 char *name = strtab + sym[i].st_name;
 106                                 dot2underscore(name);
 107                         }
 108                 }
 109         }
 110         return 0;
 111 }
 112
 113 int apply_relocate(Elf_Shdr *sechdrs,
 114                    const char *strtab,
 115                    unsigned int symindex,
 116                    unsigned int relsec,
 117                    struct module *me)
 118 {
 119         printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
 120                me->name);
 121         return -ENOEXEC;
 122 }
 123
 124 int apply_relocate_add(Elf_Shdr *sechdrs,
 125                        const char *strtab,
 126                        unsigned int symindex,
 127                        unsigned int relsec,
 128                        struct module *me)
 129 {
 130         unsigned int i;
 131         Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 132         Elf_Sym *sym;
 133         u8 *location;
 134         u32 *loc32;
 135
 136         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 137                 Elf_Addr v;
 138
 139                 /* This is where to make the change */
 140                 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 141                         + rel[i].r_offset;
 142                 loc32 = (u32 *) location;
 143
 144 #ifdef CONFIG_SPARC64
 145                 BUG_ON(((u64)location >> (u64)32) != (u64)0);
 146 #endif /* CONFIG_SPARC64 */
 147
 148                 /* This is the symbol it is referring to.  Note that all
 149                    undefined symbols have been resolved.  */
 150                 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
 151                         + ELF_R_SYM(rel[i].r_info);
 152                 v = sym->st_value + rel[i].r_addend;
 153
 154                 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
 155 #ifdef CONFIG_SPARC64
 156                 case R_SPARC_64:
 157                         location[0] = v >> 56;
 158                         location[1] = v >> 48;
 159                         location[2] = v >> 40;
 160                         location[3] = v >> 32;
 161                         location[4] = v >> 24;
 162                         location[5] = v >> 16;
 163                         location[6] = v >>  8;
 164                         location[7] = v >>  0;
 165                         break;
 166
 167                 case R_SPARC_DISP32:
 168                         v -= (Elf_Addr) location;
 169                         *loc32 = v;
 170                         break;
 171
 172                 case R_SPARC_WDISP19:
 173                         v -= (Elf_Addr) location;
 174                         *loc32 = (*loc32 & ~0x7ffff) |
 175                                 ((v >> 2) & 0x7ffff);
 176                         break;
 177
 178                 case R_SPARC_OLO10:
 179                         *loc32 = (*loc32 & ~0x1fff) |
 180                                 (((v & 0x3ff) +
 181                                   (ELF_R_TYPE(rel[i].r_info) >> 8))
 182                                  & 0x1fff);
 183                         break;
 184 #endif /* CONFIG_SPARC64 */
 185
 186                 case R_SPARC_32:
 187                 case R_SPARC_UA32:
 188                         location[0] = v >> 24;
 189                         location[1] = v >> 16;
 190                         location[2] = v >>  8;
 191                         location[3] = v >>  0;
 192                         break;
 193
 194                 case R_SPARC_WDISP30:
 195                         v -= (Elf_Addr) location;
 196                         *loc32 = (*loc32 & ~0x3fffffff) |
 197                                 ((v >> 2) & 0x3fffffff);
 198                         break;
 199
 200                 case R_SPARC_WDISP22:
 201                         v -= (Elf_Addr) location;
 202                         *loc32 = (*loc32 & ~0x3fffff) |
 203                                 ((v >> 2) & 0x3fffff);
 204                         break;
 205
 206                 case R_SPARC_LO10:
 207                         *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
 208                         break;
 209
 210                 case R_SPARC_HI22:
 211                         *loc32 = (*loc32 & ~0x3fffff) |
 212                                 ((v >> 10) & 0x3fffff);
 213                         break;
 214
 215                 default:
 216                         printk(KERN_ERR "module %s: Unknown relocation: %x\n",
 217                                me->name,
 218                                (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
 219                         return -ENOEXEC;
 220                 };
 221         }
 222         return 0;
 223 }
 224
 225 #ifdef CONFIG_SPARC64
 226 int module_finalize(const Elf_Ehdr *hdr,
 227                     const Elf_Shdr *sechdrs,
 228                     struct module *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 }