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/vmalloc.h>
  15 #include <linux/mm.h>
  16
  17 #include <asm/processor.h>
  18 #include <asm/spitfire.h>
  19
  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 void *module_alloc(unsigned long size)
  36 {
  37         void *ret;
  38
  39         /* We handle the zero case fine, unlike vmalloc */
  40         if (size == 0)
  41                 return NULL;
  42
  43         ret = module_map(size);
  44         if (!ret)
  45                 ret = ERR_PTR(-ENOMEM);
  46         else
  47                 memset(ret, 0, size);
  48
  49         return ret;
  50 }
  51
  52 /* Free memory returned from module_core_alloc/module_init_alloc */
  53 void module_free(struct module *mod, void *module_region)
  54 {
  55         vfree(module_region);
  56         /* FIXME: If module_region == mod->init_region, trim exception
  57            table entries. */
  58 }
  59
  60 /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
  61 int module_frob_arch_sections(Elf_Ehdr *hdr,
  62                               Elf_Shdr *sechdrs,
  63                               char *secstrings,
  64                               struct module *mod)
  65 {
  66         unsigned int symidx;
  67         Elf64_Sym *sym;
  68         const char *strtab;
  69         int i;
  70
  71         for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
  72                 if (symidx == hdr->e_shnum-1) {
  73                         printk("%s: no symtab found.\n", mod->name);
  74                         return -ENOEXEC;
  75                 }
  76         }
  77         sym = (Elf64_Sym *)sechdrs[symidx].sh_addr;
  78         strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
  79
  80         for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
  81                 if (sym[i].st_shndx == SHN_UNDEF &&
  82                     ELF64_ST_TYPE(sym[i].st_info) == STT_REGISTER)
  83                         sym[i].st_shndx = SHN_ABS;
  84         }
  85         return 0;
  86 }
  87
  88 int apply_relocate(Elf64_Shdr *sechdrs,
  89                    const char *strtab,
  90                    unsigned int symindex,
  91                    unsigned int relsec,
  92                    struct module *me)
  93 {
  94         printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
  95                me->name);
  96         return -ENOEXEC;
  97 }
  98
  99 int apply_relocate_add(Elf64_Shdr *sechdrs,
 100                        const char *strtab,
 101                        unsigned int symindex,
 102                        unsigned int relsec,
 103                        struct module *me)
 104 {
 105         unsigned int i;
 106         Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 107         Elf64_Sym *sym;
 108         u8 *location;
 109         u32 *loc32;
 110
 111         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 112                 Elf64_Addr v;
 113
 114                 /* This is where to make the change */
 115                 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 116                         + rel[i].r_offset;
 117                 loc32 = (u32 *) location;
 118
 119                 BUG_ON(((u64)location >> (u64)32) != (u64)0);
 120
 121                 /* This is the symbol it is referring to.  Note that all
 122                    undefined symbols have been resolved.  */
 123                 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
 124                         + ELF64_R_SYM(rel[i].r_info);
 125                 v = sym->st_value + rel[i].r_addend;
 126
 127                 switch (ELF64_R_TYPE(rel[i].r_info) & 0xff) {
 128                 case R_SPARC_64:
 129                         location[0] = v >> 56;
 130                         location[1] = v >> 48;
 131                         location[2] = v >> 40;
 132                         location[3] = v >> 32;
 133                         location[4] = v >> 24;
 134                         location[5] = v >> 16;
 135                         location[6] = v >>  8;
 136                         location[7] = v >>  0;
 137                         break;
 138
 139                 case R_SPARC_32:
 140                         location[0] = v >> 24;
 141                         location[1] = v >> 16;
 142                         location[2] = v >>  8;
 143                         location[3] = v >>  0;
 144                         break;
 145
 146                 case R_SPARC_WDISP30:
 147                         v -= (Elf64_Addr) location;
 148                         *loc32 = (*loc32 & ~0x3fffffff) |
 149                                 ((v >> 2) & 0x3fffffff);
 150                         break;
 151
 152                 case R_SPARC_WDISP22:
 153                         v -= (Elf64_Addr) location;
 154                         *loc32 = (*loc32 & ~0x3fffff) |
 155                                 ((v >> 2) & 0x3fffff);
 156                         break;
 157
 158                 case R_SPARC_WDISP19:
 159                         v -= (Elf64_Addr) location;
 160                         *loc32 = (*loc32 & ~0x7ffff) |
 161                                 ((v >> 2) & 0x7ffff);
 162                         break;
 163
 164                 case R_SPARC_LO10:
 165                         *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
 166                         break;
 167
 168                 case R_SPARC_HI22:
 169                         *loc32 = (*loc32 & ~0x3fffff) |
 170                                 ((v >> 10) & 0x3fffff);
 171                         break;
 172
 173                 case R_SPARC_OLO10:
 174                         *loc32 = (*loc32 & ~0x1fff) |
 175                                 (((v & 0x3ff) +
 176                                   (ELF64_R_TYPE(rel[i].r_info) >> 8))
 177                                  & 0x1fff);
 178                         break;
 179
 180                 default:
 181                         printk(KERN_ERR "module %s: Unknown relocation: %x\n",
 182                                me->name,
 183                                (int) (ELF64_R_TYPE(rel[i].r_info) & 0xff));
 184                         return -ENOEXEC;
 185                 };
 186         }
 187         return 0;
 188 }
 189
 190 int module_finalize(const Elf_Ehdr *hdr,
 191                     const Elf_Shdr *sechdrs,
 192                     struct module *me)
 193 {
 194         /* Cheetah's I-cache is fully coherent.  */
 195         if (tlb_type == spitfire) {
 196                 unsigned long va;
 197
 198                 flushw_all();
 199                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 200                         spitfire_put_icache_tag(va, 0x0);
 201                 __asm__ __volatile__("flush %g6");
 202         }
 203
 204         return 0;
 205 }
 206
 207 void module_arch_cleanup(struct module *mod)
 208 {
 209 }