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 struct vm_struct * modvmlist = NULL;
  21
  22 static void module_unmap(void * addr)
  23 {
  24         struct vm_struct **p, *tmp;
  25         int i;
  26
  27         if (!addr)
  28                 return;
  29         if ((PAGE_SIZE-1) & (unsigned long) addr) {
  30                 printk("Trying to unmap module with bad address (%p)\n", addr);
  31                 return;
  32         }
  33
  34         for (p = &modvmlist; (tmp = *p) != NULL; p = &tmp->next) {
  35                 if (tmp->addr == addr) {
  36                         *p = tmp->next;
  37                         goto found;
  38                 }
  39         }
  40         printk("Trying to unmap nonexistent module vm area (%p)\n", addr);
  41         return;
  42
  43 found:
  44         unmap_vm_area(tmp);
  45
  46         for (i = 0; i < tmp->nr_pages; i++) {
  47                 if (unlikely(!tmp->pages[i]))
  48                         BUG();
  49                 __free_page(tmp->pages[i]);
  50         }
  51
  52         kfree(tmp->pages);
  53         kfree(tmp);
  54 }
  55
  56
  57 static void *module_map(unsigned long size)
  58 {
  59         struct vm_struct **p, *tmp, *area;
  60         struct page **pages;
  61         void * addr;
  62         unsigned int nr_pages, array_size, i;
  63
  64         size = PAGE_ALIGN(size);
  65         if (!size || size > MODULES_LEN)
  66                 return NULL;
  67
  68         addr = (void *) MODULES_VADDR;
  69         for (p = &modvmlist; (tmp = *p) != NULL; p = &tmp->next) {
  70                 if (size + (unsigned long) addr < (unsigned long) tmp->addr)
  71                         break;
  72                 addr = (void *) (tmp->size + (unsigned long) tmp->addr);
  73         }
  74         if ((unsigned long) addr + size >= MODULES_END)
  75                 return NULL;
  76
  77         area = (struct vm_struct *) kmalloc(sizeof(*area), GFP_KERNEL);
  78         if (!area)
  79                 return NULL;
  80         area->size = size + PAGE_SIZE;
  81         area->addr = addr;
  82         area->next = *p;
  83         area->pages = NULL;
  84         area->nr_pages = 0;
  85         area->phys_addr = 0;
  86         *p = area;
  87
  88         nr_pages = size >> PAGE_SHIFT;
  89         array_size = (nr_pages * sizeof(struct page *));
  90
  91         area->nr_pages = nr_pages;
  92         area->pages = pages = kmalloc(array_size, GFP_KERNEL);
  93         if (!area->pages)
  94                 goto fail;
  95
  96         memset(area->pages, 0, array_size);
  97
  98         for (i = 0; i < area->nr_pages; i++) {
  99                 area->pages[i] = alloc_page(GFP_KERNEL);
 100                 if (unlikely(!area->pages[i]))
 101                         goto fail;
 102         }
 103
 104         if (map_vm_area(area, PAGE_KERNEL, &pages)) {
 105                 unmap_vm_area(area);
 106                 goto fail;
 107         }
 108
 109         return area->addr;
 110
 111 fail:
 112         if (area->pages) {
 113                 for (i = 0; i < area->nr_pages; i++) {
 114                         if (area->pages[i])
 115                                 __free_page(area->pages[i]);
 116                 }
 117                 kfree(area->pages);
 118         }
 119         kfree(area);
 120
 121         return NULL;
 122 }
 123
 124 void *module_alloc(unsigned long size)
 125 {
 126         void *ret;
 127
 128         /* We handle the zero case fine, unlike vmalloc */
 129         if (size == 0)
 130                 return NULL;
 131
 132         ret = module_map(size);
 133         if (!ret)
 134                 ret = ERR_PTR(-ENOMEM);
 135         else
 136                 memset(ret, 0, size);
 137
 138         return ret;
 139 }
 140
 141 /* Free memory returned from module_core_alloc/module_init_alloc */
 142 void module_free(struct module *mod, void *module_region)
 143 {
 144         write_lock(&vmlist_lock);
 145         module_unmap(module_region);
 146         write_unlock(&vmlist_lock);
 147         /* FIXME: If module_region == mod->init_region, trim exception
 148            table entries. */
 149 }
 150
 151 /* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
 152 int module_frob_arch_sections(Elf_Ehdr *hdr,
 153                               Elf_Shdr *sechdrs,
 154                               char *secstrings,
 155                               struct module *mod)
 156 {
 157         unsigned int symidx;
 158         Elf64_Sym *sym;
 159         const char *strtab;
 160         int i;
 161
 162         for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
 163                 if (symidx == hdr->e_shnum-1) {
 164                         printk("%s: no symtab found.\n", mod->name);
 165                         return -ENOEXEC;
 166                 }
 167         }
 168         sym = (Elf64_Sym *)sechdrs[symidx].sh_addr;
 169         strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;
 170
 171         for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
 172                 if (sym[i].st_shndx == SHN_UNDEF &&
 173                     ELF64_ST_TYPE(sym[i].st_info) == STT_REGISTER)
 174                         sym[i].st_shndx = SHN_ABS;
 175         }
 176         return 0;
 177 }
 178
 179 int apply_relocate(Elf64_Shdr *sechdrs,
 180                    const char *strtab,
 181                    unsigned int symindex,
 182                    unsigned int relsec,
 183                    struct module *me)
 184 {
 185         printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
 186                me->name);
 187         return -ENOEXEC;
 188 }
 189
 190 int apply_relocate_add(Elf64_Shdr *sechdrs,
 191                        const char *strtab,
 192                        unsigned int symindex,
 193                        unsigned int relsec,
 194                        struct module *me)
 195 {
 196         unsigned int i;
 197         Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
 198         Elf64_Sym *sym;
 199         u8 *location;
 200         u32 *loc32;
 201
 202         for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
 203                 Elf64_Addr v;
 204
 205                 /* This is where to make the change */
 206                 location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
 207                         + rel[i].r_offset;
 208                 loc32 = (u32 *) location;
 209
 210                 BUG_ON(((u64)location >> (u64)32) != (u64)0);
 211
 212                 /* This is the symbol it is referring to.  Note that all
 213                    undefined symbols have been resolved.  */
 214                 sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
 215                         + ELF64_R_SYM(rel[i].r_info);
 216                 v = sym->st_value + rel[i].r_addend;
 217
 218                 switch (ELF64_R_TYPE(rel[i].r_info) & 0xff) {
 219                 case R_SPARC_64:
 220                         location[0] = v >> 56;
 221                         location[1] = v >> 48;
 222                         location[2] = v >> 40;
 223                         location[3] = v >> 32;
 224                         location[4] = v >> 24;
 225                         location[5] = v >> 16;
 226                         location[6] = v >>  8;
 227                         location[7] = v >>  0;
 228                         break;
 229
 230                 case R_SPARC_32:
 231                         location[0] = v >> 24;
 232                         location[1] = v >> 16;
 233                         location[2] = v >>  8;
 234                         location[3] = v >>  0;
 235                         break;
 236
 237                 case R_SPARC_WDISP30:
 238                         v -= (Elf64_Addr) location;
 239                         *loc32 = (*loc32 & ~0x3fffffff) |
 240                                 ((v >> 2) & 0x3fffffff);
 241                         break;
 242
 243                 case R_SPARC_WDISP22:
 244                         v -= (Elf64_Addr) location;
 245                         *loc32 = (*loc32 & ~0x3fffff) |
 246                                 ((v >> 2) & 0x3fffff);
 247                         break;
 248
 249                 case R_SPARC_WDISP19:
 250                         v -= (Elf64_Addr) location;
 251                         *loc32 = (*loc32 & ~0x7ffff) |
 252                                 ((v >> 2) & 0x7ffff);
 253                         break;
 254
 255                 case R_SPARC_LO10:
 256                         *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
 257                         break;
 258
 259                 case R_SPARC_HI22:
 260                         *loc32 = (*loc32 & ~0x3fffff) |
 261                                 ((v >> 10) & 0x3fffff);
 262                         break;
 263
 264                 case R_SPARC_OLO10:
 265                         *loc32 = (*loc32 & ~0x1fff) |
 266                                 (((v & 0x3ff) +
 267                                   (ELF64_R_TYPE(rel[i].r_info) >> 8))
 268                                  & 0x1fff);
 269                         break;
 270
 271                 default:
 272                         printk(KERN_ERR "module %s: Unknown relocation: %x\n",
 273                                me->name,
 274                                (int) (ELF64_R_TYPE(rel[i].r_info) & 0xff));
 275                         return -ENOEXEC;
 276                 };
 277         }
 278         return 0;
 279 }
 280
 281 int module_finalize(const Elf_Ehdr *hdr,
 282                     const Elf_Shdr *sechdrs,
 283                     struct module *me)
 284 {
 285         /* Cheetah's I-cache is fully coherent.  */
 286         if (tlb_type == spitfire) {
 287                 unsigned long va;
 288
 289                 flushw_all();
 290                 for (va =  0; va < (PAGE_SIZE << 1); va += 32)
 291                         spitfire_put_icache_tag(va, 0x0);
 292                 __asm__ __volatile__("flush %g6");
 293         }
 294
 295         return 0;
 296 }
 297
 298 void module_arch_cleanup(struct module *mod)
 299 {
 300 }