arch/sparc64/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/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 static void *module_map(unsigned long size)
  20 {
  21         struct vm_struct *area;
  22
  23         size = PAGE_ALIGN(size);
  24         if (!size || size > MODULES_LEN)
  25                 return NULL;
  26
  27         area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
  28         if (!area)
  29                 return NULL;
  30
  31         return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
  32 }
  33
  34 void *module_alloc(unsigned long size)
  35 {
  36         void *ret;
  37
  38         /* We handle the zero case fine, unlike vmalloc */
  39         if (size == 0)
  40                 return NULL;
  41
  42         ret = module_map(size);
  43         if (!ret)
  44                 ret = ERR_PTR(-ENOMEM);
  45         else
  46                 memset(ret, 0, size);
  47
  48         return ret;
  49 }
  50
  51 /* Free memory returned from module_core_alloc/module_init_alloc */
  52 void module_free(struct module *mod, void *module_region)
  53 {
  54         vfree(module_region);
  55         /* FIXME: If module_region == mod->init_region, trim exception
  56            table entries. */
  57 }
  58
  59 /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
  60 int module_frob_arch_sections(Elf_Ehdr *hdr,
  61                               Elf_Shdr *sechdrs,
  62                               char *secstrings,
  63                               struct module *mod)
  64 {
  65         unsigned int symidx;
  66         Elf64_Sym *sym;
  67         const char *strtab;
  68         int i;
  69
  70         for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
  71                 if (symidx == hdr->e_shnum-1) {
  72                         printk("%s: no symtab found.\n", mod->name);
  73                         return -ENOEXEC;
  74                 }
  75         }
  76         sym = (Elf64_Sym *)sechdrs[symidx].sh_addr;
  77         strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
  78
  79         for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
  80                 if (sym[i].st_shndx == SHN_UNDEF &&
  81                     ELF64_ST_TYPE(sym[i].st_info) == STT_REGISTER)
  82                         sym[i].st_shndx = SHN_ABS;
  83         }
  84         return 0;
  85 }
  86
  87 int apply_relocate(Elf64_Shdr *sechdrs,
  88                    const char *strtab,
  89                    unsigned int symindex,
  90                    unsigned int relsec,
  91                    struct module *me)
  92 {
  93         printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
  94                me->name);
  95         return -ENOEXEC;
  96 }
  97
  98 int apply_relocate_add(Elf64_Shdr *sechdrs,
  99                        const char *strtab,
 100                        unsigned int symindex,
 101                        unsigned int relsec,
 102                        struct module *me)
 103 {
 104         unsigned int i;
 105         Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 106         Elf64_Sym *sym;
 107         u8 *location;
 108         u32 *loc32;
 109
 110         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 111                 Elf64_Addr v;
 112
 113                 /* This is where to make the change */
 114                 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 115                         + rel[i].r_offset;
 116                 loc32 = (u32 *) location;
 117
 118                 BUG_ON(((u64)location >> (u64)32) != (u64)0);
 119
 120                 /* This is the symbol it is referring to.  Note that all
 121                    undefined symbols have been resolved.  */
 122                 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
 123                         + ELF64_R_SYM(rel[i].r_info);
 124                 v = sym->st_value + rel[i].r_addend;
 125
 126                 switch (ELF64_R_TYPE(rel[i].r_info) & 0xff) {
 127                 case R_SPARC_64:
 128                         location[0] = v >> 56;
 129                         location[1] = v >> 48;
 130                         location[2] = v >> 40;
 131                         location[3] = v >> 32;
 132                         location[4] = v >> 24;
 133                         location[5] = v >> 16;
 134                         location[6] = v >>  8;
 135                         location[7] = v >>  0;
 136                         break;
 137
 138                 case R_SPARC_32:
 139                         location[0] = v >> 24;
 140                         location[1] = v >> 16;
 141                         location[2] = v >>  8;
 142                         location[3] = v >>  0;
 143                         break;
 144
 145                 case R_SPARC_DISP32:
 146                         v -= (Elf64_Addr) location;
 147                         *loc32 = v;
 148                         break;
 149
 150                 case R_SPARC_WDISP30:
 151                         v -= (Elf64_Addr) location;
 152                         *loc32 = (*loc32 & ~0x3fffffff) |
 153                                 ((v >> 2) & 0x3fffffff);
 154                         break;
 155
 156                 case R_SPARC_WDISP22:
 157                         v -= (Elf64_Addr) location;
 158                         *loc32 = (*loc32 & ~0x3fffff) |
 159                                 ((v >> 2) & 0x3fffff);
 160                         break;
 161
 162                 case R_SPARC_WDISP19:
 163                         v -= (Elf64_Addr) location;
 164                         *loc32 = (*loc32 & ~0x7ffff) |
 165                                 ((v >> 2) & 0x7ffff);
 166                         break;
 167
 168                 case R_SPARC_LO10:
 169                         *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
 170                         break;
 171
 172                 case R_SPARC_HI22:
 173                         *loc32 = (*loc32 & ~0x3fffff) |
 174                                 ((v >> 10) & 0x3fffff);
 175                         break;
 176
 177                 case R_SPARC_OLO10:
 178                         *loc32 = (*loc32 & ~0x1fff) |
 179                                 (((v & 0x3ff) +
 180                                   (ELF64_R_TYPE(rel[i].r_info) >> 8))
 181                                  & 0x1fff);
 182                         break;
 183
 184                 default:
 185                         printk(KERN_ERR "module %s: Unknown relocation: %x\n",
 186                                me->name,
 187                                (int) (ELF64_R_TYPE(rel[i].r_info) & 0xff));
 188                         return -ENOEXEC;
 189                 };
 190         }
 191         return 0;
 192 }
 193
 194 int module_finalize(const Elf_Ehdr *hdr,
 195                     const Elf_Shdr *sechdrs,
 196                     struct module *me)
 197 {
 198         /* Cheetah's I-cache is fully coherent.  */
 199         if (tlb_type == spitfire) {
 200                 unsigned long va;
 201
 202                 flushw_all();
 203                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 204                         spitfire_put_icache_tag(va, 0x0);
 205                 __asm__ __volatile__("flush %g6");
 206         }
 207
 208         return 0;
 209 }
 210
 211 void module_arch_cleanup(struct module *mod)
 212 {
 213 }