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         struct vm_struct *area;
  27
  28         size = PAGE_ALIGN(size);
  29         if (!size || size > MODULES_LEN)
  30                 return NULL;
  31
  32         area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
  33         if (!area)
  34                 return NULL;
  35
  36         return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
  37 }
  38
  39 static char *dot2underscore(char *name)
  40 {
  41         return name;
  42 }
  43 #else
  44 static void *module_map(unsigned long size)
  45 {
  46         return vmalloc(size);
  47 }
  48
  49 /* Replace references to .func with _Func */
  50 static char *dot2underscore(char *name)
  51 {
  52         if (name[0] == '.') {
  53                 name[0] = '_';
  54                 name[1] = toupper(name[1]);
  55         }
  56         return name;
  57 }
  58 #endif /* CONFIG_SPARC64 */
  59
  60 void *module_alloc(unsigned long size)
  61 {
  62         void *ret;
  63
  64         /* We handle the zero case fine, unlike vmalloc */
  65         if (size == 0)
  66                 return NULL;
  67
  68         ret = module_map(size);
  69         if (!ret)
  70                 ret = ERR_PTR(-ENOMEM);
  71         else
  72                 memset(ret, 0, size);
  73
  74         return ret;
  75 }
  76
  77 /* Free memory returned from module_core_alloc/module_init_alloc */
  78 void module_free(struct module *mod, void *module_region)
  79 {
  80         vfree(module_region);
  81 }
  82
  83 /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
  84 int module_frob_arch_sections(Elf_Ehdr *hdr,
  85                               Elf_Shdr *sechdrs,
  86                               char *secstrings,
  87                               struct module *mod)
  88 {
  89         unsigned int symidx;
  90         Elf_Sym *sym;
  91         char *strtab;
  92         int i;
  93
  94         for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
  95                 if (symidx == hdr->e_shnum-1) {
  96                         printk("%s: no symtab found.\n", mod->name);
  97                         return -ENOEXEC;
  98                 }
  99         }
 100         sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
 101         strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
 102
 103         for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
 104                 if (sym[i].st_shndx == SHN_UNDEF) {
 105                         if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) {
 106                                 sym[i].st_shndx = SHN_ABS;
 107                         } else {
 108                                 char *name = strtab + sym[i].st_name;
 109                                 dot2underscore(name);
 110                         }
 111                 }
 112         }
 113         return 0;
 114 }
 115
 116 int apply_relocate(Elf_Shdr *sechdrs,
 117                    const char *strtab,
 118                    unsigned int symindex,
 119                    unsigned int relsec,
 120                    struct module *me)
 121 {
 122         printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
 123                me->name);
 124         return -ENOEXEC;
 125 }
 126
 127 int apply_relocate_add(Elf_Shdr *sechdrs,
 128                        const char *strtab,
 129                        unsigned int symindex,
 130                        unsigned int relsec,
 131                        struct module *me)
 132 {
 133         unsigned int i;
 134         Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 135         Elf_Sym *sym;
 136         u8 *location;
 137         u32 *loc32;
 138
 139         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 140                 Elf_Addr v;
 141
 142                 /* This is where to make the change */
 143                 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 144                         + rel[i].r_offset;
 145                 loc32 = (u32 *) location;
 146
 147 #ifdef CONFIG_SPARC64
 148                 BUG_ON(((u64)location >> (u64)32) != (u64)0);
 149 #endif /* CONFIG_SPARC64 */
 150
 151                 /* This is the symbol it is referring to.  Note that all
 152                    undefined symbols have been resolved.  */
 153                 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
 154                         + ELF_R_SYM(rel[i].r_info);
 155                 v = sym->st_value + rel[i].r_addend;
 156
 157                 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
 158 #ifdef CONFIG_SPARC64
 159                 case R_SPARC_64:
 160                         location[0] = v >> 56;
 161                         location[1] = v >> 48;
 162                         location[2] = v >> 40;
 163                         location[3] = v >> 32;
 164                         location[4] = v >> 24;
 165                         location[5] = v >> 16;
 166                         location[6] = v >>  8;
 167                         location[7] = v >>  0;
 168                         break;
 169
 170                 case R_SPARC_DISP32:
 171                         v -= (Elf_Addr) location;
 172                         *loc32 = v;
 173                         break;
 174
 175                 case R_SPARC_WDISP19:
 176                         v -= (Elf_Addr) location;
 177                         *loc32 = (*loc32 & ~0x7ffff) |
 178                                 ((v >> 2) & 0x7ffff);
 179                         break;
 180
 181                 case R_SPARC_OLO10:
 182                         *loc32 = (*loc32 & ~0x1fff) |
 183                                 (((v & 0x3ff) +
 184                                   (ELF_R_TYPE(rel[i].r_info) >> 8))
 185                                  & 0x1fff);
 186                         break;
 187 #endif /* CONFIG_SPARC64 */
 188
 189                 case R_SPARC_32:
 190                 case R_SPARC_UA32:
 191                         location[0] = v >> 24;
 192                         location[1] = v >> 16;
 193                         location[2] = v >>  8;
 194                         location[3] = v >>  0;
 195                         break;
 196
 197                 case R_SPARC_WDISP30:
 198                         v -= (Elf_Addr) location;
 199                         *loc32 = (*loc32 & ~0x3fffffff) |
 200                                 ((v >> 2) & 0x3fffffff);
 201                         break;
 202
 203                 case R_SPARC_WDISP22:
 204                         v -= (Elf_Addr) location;
 205                         *loc32 = (*loc32 & ~0x3fffff) |
 206                                 ((v >> 2) & 0x3fffff);
 207                         break;
 208
 209                 case R_SPARC_LO10:
 210                         *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
 211                         break;
 212
 213                 case R_SPARC_HI22:
 214                         *loc32 = (*loc32 & ~0x3fffff) |
 215                                 ((v >> 10) & 0x3fffff);
 216                         break;
 217
 218                 default:
 219                         printk(KERN_ERR "module %s: Unknown relocation: %x\n",
 220                                me->name,
 221                                (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
 222                         return -ENOEXEC;
 223                 };
 224         }
 225         return 0;
 226 }
 227
 228 #ifdef CONFIG_SPARC64
 229 int module_finalize(const Elf_Ehdr *hdr,
 230                     const Elf_Shdr *sechdrs,
 231                     struct module *me)
 232 {
 233         /* make jump label nops */
 234         jump_label_apply_nops(me);
 235
 236         /* Cheetah's I-cache is fully coherent.  */
 237         if (tlb_type == spitfire) {
 238                 unsigned long va;
 239
 240                 flushw_all();
 241                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 242                         spitfire_put_icache_tag(va, 0x0);
 243                 __asm__ __volatile__("flush %g6");
 244         }
 245
 246         return 0;
 247 }
 248 #else
 249 int module_finalize(const Elf_Ehdr *hdr,
 250                     const Elf_Shdr *sechdrs,
 251                     struct module *me)
 252 {
 253         return 0;
 254 }
 255 #endif /* CONFIG_SPARC64 */
 256
 257 void module_arch_cleanup(struct module *mod)
 258 {
 259 }