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 /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
  72 int module_frob_arch_sections(Elf_Ehdr *hdr,
  73                               Elf_Shdr *sechdrs,
  74                               char *secstrings,
  75                               struct module *mod)
  76 {
  77         unsigned int symidx;
  78         Elf_Sym *sym;
  79         char *strtab;
  80         int i;
  81
  82         for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
  83                 if (symidx == hdr->e_shnum-1) {
  84                         printk("%s: no symtab found.\n", mod->name);
  85                         return -ENOEXEC;
  86                 }
  87         }
  88         sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
  89         strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
  90
  91         for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
  92                 if (sym[i].st_shndx == SHN_UNDEF) {
  93                         if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) {
  94                                 sym[i].st_shndx = SHN_ABS;
  95                         } else {
  96                                 char *name = strtab + sym[i].st_name;
  97                                 dot2underscore(name);
  98                         }
  99                 }
 100         }
 101         return 0;
 102 }
 103
 104 int apply_relocate_add(Elf_Shdr *sechdrs,
 105                        const char *strtab,
 106                        unsigned int symindex,
 107                        unsigned int relsec,
 108                        struct module *me)
 109 {
 110         unsigned int i;
 111         Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 112         Elf_Sym *sym;
 113         u8 *location;
 114         u32 *loc32;
 115
 116         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 117                 Elf_Addr v;
 118
 119                 /* This is where to make the change */
 120                 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 121                         + rel[i].r_offset;
 122                 loc32 = (u32 *) location;
 123
 124 #ifdef CONFIG_SPARC64
 125                 BUG_ON(((u64)location >> (u64)32) != (u64)0);
 126 #endif /* CONFIG_SPARC64 */
 127
 128                 /* This is the symbol it is referring to.  Note that all
 129                    undefined symbols have been resolved.  */
 130                 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
 131                         + ELF_R_SYM(rel[i].r_info);
 132                 v = sym->st_value + rel[i].r_addend;
 133
 134                 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
 135 #ifdef CONFIG_SPARC64
 136                 case R_SPARC_64:
 137                         location[0] = v >> 56;
 138                         location[1] = v >> 48;
 139                         location[2] = v >> 40;
 140                         location[3] = v >> 32;
 141                         location[4] = v >> 24;
 142                         location[5] = v >> 16;
 143                         location[6] = v >>  8;
 144                         location[7] = v >>  0;
 145                         break;
 146
 147                 case R_SPARC_DISP32:
 148                         v -= (Elf_Addr) location;
 149                         *loc32 = v;
 150                         break;
 151
 152                 case R_SPARC_WDISP19:
 153                         v -= (Elf_Addr) location;
 154                         *loc32 = (*loc32 & ~0x7ffff) |
 155                                 ((v >> 2) & 0x7ffff);
 156                         break;
 157
 158                 case R_SPARC_OLO10:
 159                         *loc32 = (*loc32 & ~0x1fff) |
 160                                 (((v & 0x3ff) +
 161                                   (ELF_R_TYPE(rel[i].r_info) >> 8))
 162                                  & 0x1fff);
 163                         break;
 164 #endif /* CONFIG_SPARC64 */
 165
 166                 case R_SPARC_32:
 167                 case R_SPARC_UA32:
 168                         location[0] = v >> 24;
 169                         location[1] = v >> 16;
 170                         location[2] = v >>  8;
 171                         location[3] = v >>  0;
 172                         break;
 173
 174                 case R_SPARC_WDISP30:
 175                         v -= (Elf_Addr) location;
 176                         *loc32 = (*loc32 & ~0x3fffffff) |
 177                                 ((v >> 2) & 0x3fffffff);
 178                         break;
 179
 180                 case R_SPARC_WDISP22:
 181                         v -= (Elf_Addr) location;
 182                         *loc32 = (*loc32 & ~0x3fffff) |
 183                                 ((v >> 2) & 0x3fffff);
 184                         break;
 185
 186                 case R_SPARC_LO10:
 187                         *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
 188                         break;
 189
 190                 case R_SPARC_HI22:
 191                         *loc32 = (*loc32 & ~0x3fffff) |
 192                                 ((v >> 10) & 0x3fffff);
 193                         break;
 194
 195                 default:
 196                         printk(KERN_ERR "module %s: Unknown relocation: %x\n",
 197                                me->name,
 198                                (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
 199                         return -ENOEXEC;
 200                 }
 201         }
 202         return 0;
 203 }
 204
 205 #ifdef CONFIG_SPARC64
 206 int module_finalize(const Elf_Ehdr *hdr,
 207                     const Elf_Shdr *sechdrs,
 208                     struct module *me)
 209 {
 210         /* make jump label nops */
 211         jump_label_apply_nops(me);
 212
 213         /* Cheetah's I-cache is fully coherent.  */
 214         if (tlb_type == spitfire) {
 215                 unsigned long va;
 216
 217                 flushw_all();
 218                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 219                         spitfire_put_icache_tag(va, 0x0);
 220                 __asm__ __volatile__("flush %g6");
 221         }
 222
 223         return 0;
 224 }
 225 #endif /* CONFIG_SPARC64 */