arch/sparc/kernel/module_64.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/slab.h>
  14 #include <linux/mm.h>
  15
  16 #include <asm/processor.h>
  17 #include <asm/spitfire.h>
  18
  19 #ifdef CONFIG_SPARC64
  20 static void *module_map(unsigned long size)
  21 {
  22         struct vm_struct *area;
  23
  24         size = PAGE_ALIGN(size);
  25         if (!size || size > MODULES_LEN)
  26                 return NULL;
  27
  28         area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
  29         if (!area)
  30                 return NULL;
  31
  32         return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
  33 }
  34
  35 static char *dot2underscore(char *name)
  36 {
  37         return name;
  38 }
  39 #endif /* CONFIG_SPARC64 */
  40
  41 void *module_alloc(unsigned long size)
  42 {
  43         void *ret;
  44
  45         /* We handle the zero case fine, unlike vmalloc */
  46         if (size == 0)
  47                 return NULL;
  48
  49         ret = module_map(size);
  50         if (!ret)
  51                 ret = ERR_PTR(-ENOMEM);
  52         else
  53                 memset(ret, 0, size);
  54
  55         return ret;
  56 }
  57
  58 /* Free memory returned from module_core_alloc/module_init_alloc */
  59 void module_free(struct module *mod, void *module_region)
  60 {
  61         vfree(module_region);
  62         /* FIXME: If module_region == mod->init_region, trim exception
  63            table entries. */
  64 }
  65
  66 /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
  67 int module_frob_arch_sections(Elf_Ehdr *hdr,
  68                               Elf_Shdr *sechdrs,
  69                               char *secstrings,
  70                               struct module *mod)
  71 {
  72         unsigned int symidx;
  73         Elf_Sym *sym;
  74         char *strtab;
  75         int i;
  76
  77         for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
  78                 if (symidx == hdr->e_shnum-1) {
  79                         printk("%s: no symtab found.\n", mod->name);
  80                         return -ENOEXEC;
  81                 }
  82         }
  83         sym = (Elf_Sym *)sechdrs[symidx].sh_addr;
  84         strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
  85
  86         for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
  87                 if (sym[i].st_shndx == SHN_UNDEF) {
  88                         if (ELF_ST_TYPE(sym[i].st_info) == STT_REGISTER) {
  89                                 sym[i].st_shndx = SHN_ABS;
  90                         } else {
  91                                 char *name = strtab + sym[i].st_name;
  92                                 dot2underscore(name);
  93                         }
  94                 }
  95         }
  96         return 0;
  97 }
  98
  99 int apply_relocate(Elf_Shdr *sechdrs,
 100                    const char *strtab,
 101                    unsigned int symindex,
 102                    unsigned int relsec,
 103                    struct module *me)
 104 {
 105         printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
 106                me->name);
 107         return -ENOEXEC;
 108 }
 109
 110 int apply_relocate_add(Elf_Shdr *sechdrs,
 111                        const char *strtab,
 112                        unsigned int symindex,
 113                        unsigned int relsec,
 114                        struct module *me)
 115 {
 116         unsigned int i;
 117         Elf_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 118         Elf_Sym *sym;
 119         u8 *location;
 120         u32 *loc32;
 121
 122         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 123                 Elf_Addr v;
 124
 125                 /* This is where to make the change */
 126                 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 127                         + rel[i].r_offset;
 128                 loc32 = (u32 *) location;
 129
 130 #ifdef CONFIG_SPARC64
 131                 BUG_ON(((u64)location >> (u64)32) != (u64)0);
 132 #endif /* CONFIG_SPARC64 */
 133
 134                 /* This is the symbol it is referring to.  Note that all
 135                    undefined symbols have been resolved.  */
 136                 sym = (Elf_Sym *)sechdrs[symindex].sh_addr
 137                         + ELF_R_SYM(rel[i].r_info);
 138                 v = sym->st_value + rel[i].r_addend;
 139
 140                 switch (ELF_R_TYPE(rel[i].r_info) & 0xff) {
 141 #ifdef CONFIG_SPARC64
 142                 case R_SPARC_64:
 143                         location[0] = v >> 56;
 144                         location[1] = v >> 48;
 145                         location[2] = v >> 40;
 146                         location[3] = v >> 32;
 147                         location[4] = v >> 24;
 148                         location[5] = v >> 16;
 149                         location[6] = v >>  8;
 150                         location[7] = v >>  0;
 151                         break;
 152
 153                 case R_SPARC_DISP32:
 154                         v -= (Elf_Addr) location;
 155                         *loc32 = v;
 156                         break;
 157
 158                 case R_SPARC_WDISP19:
 159                         v -= (Elf_Addr) location;
 160                         *loc32 = (*loc32 & ~0x7ffff) |
 161                                 ((v >> 2) & 0x7ffff);
 162                         break;
 163
 164                 case R_SPARC_OLO10:
 165                         *loc32 = (*loc32 & ~0x1fff) |
 166                                 (((v & 0x3ff) +
 167                                   (ELF_R_TYPE(rel[i].r_info) >> 8))
 168                                  & 0x1fff);
 169                         break;
 170 #endif /* CONFIG_SPARC64 */
 171
 172                 case R_SPARC_32:
 173                         location[0] = v >> 24;
 174                         location[1] = v >> 16;
 175                         location[2] = v >>  8;
 176                         location[3] = v >>  0;
 177                         break;
 178
 179                 case R_SPARC_WDISP30:
 180                         v -= (Elf_Addr) location;
 181                         *loc32 = (*loc32 & ~0x3fffffff) |
 182                                 ((v >> 2) & 0x3fffffff);
 183                         break;
 184
 185                 case R_SPARC_WDISP22:
 186                         v -= (Elf_Addr) location;
 187                         *loc32 = (*loc32 & ~0x3fffff) |
 188                                 ((v >> 2) & 0x3fffff);
 189                         break;
 190
 191                 case R_SPARC_LO10:
 192                         *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
 193                         break;
 194
 195                 case R_SPARC_HI22:
 196                         *loc32 = (*loc32 & ~0x3fffff) |
 197                                 ((v >> 10) & 0x3fffff);
 198                         break;
 199
 200                 default:
 201                         printk(KERN_ERR "module %s: Unknown relocation: %x\n",
 202                                me->name,
 203                                (int) (ELF_R_TYPE(rel[i].r_info) & 0xff));
 204                         return -ENOEXEC;
 205                 };
 206         }
 207         return 0;
 208 }
 209
 210 #ifdef CONFIG_SPARC64
 211 int module_finalize(const Elf_Ehdr *hdr,
 212                     const Elf_Shdr *sechdrs,
 213                     struct module *me)
 214 {
 215         /* Cheetah's I-cache is fully coherent.  */
 216         if (tlb_type == spitfire) {
 217                 unsigned long va;
 218
 219                 flushw_all();
 220                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 221                         spitfire_put_icache_tag(va, 0x0);
 222                 __asm__ __volatile__("flush %g6");
 223         }
 224
 225         return 0;
 226 }
 227 #endif /* CONFIG_SPARC64 */
 228
 229 void module_arch_cleanup(struct module *mod)
 230 {
 231 }