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module.c

/* Kernel module help for sparc64.
 *
 * Copyright (C) 2001 Rusty Russell.
 * Copyright (C) 2002 David S. Miller.
 */

#include <linux/moduleloader.h>
#include <linux/kernel.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/slab.h>
#include <linux/mm.h>

#include <asm/processor.h>
#include <asm/spitfire.h>

static void *module_map(unsigned long size)
{
      struct vm_struct *area;

      size = PAGE_ALIGN(size);
      if (!size || size > MODULES_LEN)
            return NULL;

      area = __get_vm_area(size, VM_ALLOC, MODULES_VADDR, MODULES_END);
      if (!area)
            return NULL;

      return __vmalloc_area(area, GFP_KERNEL, PAGE_KERNEL);
}

void *module_alloc(unsigned long size)
{
      void *ret;

      /* We handle the zero case fine, unlike vmalloc */
      if (size == 0)
            return NULL;

      ret = module_map(size);
      if (!ret)
            ret = ERR_PTR(-ENOMEM);
      else
            memset(ret, 0, size);

      return ret;
}

/* Free memory returned from module_core_alloc/module_init_alloc */
void module_free(struct module *mod, void *module_region)
{
      vfree(module_region);
      /* FIXME: If module_region == mod->init_region, trim exception
           table entries. */
}

/* Make generic code ignore STT_REGISTER dummy undefined symbols.  */
int module_frob_arch_sections(Elf_Ehdr *hdr,
                        Elf_Shdr *sechdrs,
                        char *secstrings,
                        struct module *mod)
{
      unsigned int symidx;
      Elf64_Sym *sym;
      const char *strtab;
      int i;

      for (symidx = 0; sechdrs[symidx].sh_type != SHT_SYMTAB; symidx++) {
            if (symidx == hdr->e_shnum-1) {
                  printk("%s: no symtab found.\n", mod->name);
                  return -ENOEXEC;
            }
      }
      sym = (Elf64_Sym *)sechdrs[symidx].sh_addr;
      strtab = (char *)sechdrs[sechdrs[symidx].sh_link].sh_addr;

      for (i = 1; i < sechdrs[symidx].sh_size / sizeof(Elf_Sym); i++) {
            if (sym[i].st_shndx == SHN_UNDEF &&
                ELF64_ST_TYPE(sym[i].st_info) == STT_REGISTER)
                  sym[i].st_shndx = SHN_ABS;
      }
      return 0;
}

int apply_relocate(Elf64_Shdr *sechdrs,
               const char *strtab,
               unsigned int symindex,
               unsigned int relsec,
               struct module *me)
{
      printk(KERN_ERR "module %s: non-ADD RELOCATION unsupported\n",
             me->name);
      return -ENOEXEC;
}

int apply_relocate_add(Elf64_Shdr *sechdrs,
                   const char *strtab,
                   unsigned int symindex,
                   unsigned int relsec,
                   struct module *me)
{
      unsigned int i;
      Elf64_Rela *rel = (void *)sechdrs[relsec].sh_addr;
      Elf64_Sym *sym;
      u8 *location;
      u32 *loc32;

      for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
            Elf64_Addr v;

            /* This is where to make the change */
            location = (u8 *)sechdrs[sechdrs[relsec].sh_info].sh_addr
                  + rel[i].r_offset;
            loc32 = (u32 *) location;

            BUG_ON(((u64)location >> (u64)32) != (u64)0);

            /* This is the symbol it is referring to.  Note that all
               undefined symbols have been resolved.  */
            sym = (Elf64_Sym *)sechdrs[symindex].sh_addr
                  + ELF64_R_SYM(rel[i].r_info);
            v = sym->st_value + rel[i].r_addend;

            switch (ELF64_R_TYPE(rel[i].r_info) & 0xff) {
            case R_SPARC_64:
                  location[0] = v >> 56;
                  location[1] = v >> 48;
                  location[2] = v >> 40;
                  location[3] = v >> 32;
                  location[4] = v >> 24;
                  location[5] = v >> 16;
                  location[6] = v >>  8;
                  location[7] = v >>  0;
                  break;

            case R_SPARC_32:
                  location[0] = v >> 24;
                  location[1] = v >> 16;
                  location[2] = v >>  8;
                  location[3] = v >>  0;
                  break;

            case R_SPARC_DISP32:
                  v -= (Elf64_Addr) location;
                  *loc32 = v;
                  break;

            case R_SPARC_WDISP30:
                  v -= (Elf64_Addr) location;
                  *loc32 = (*loc32 & ~0x3fffffff) |
                        ((v >> 2) & 0x3fffffff);
                  break;

            case R_SPARC_WDISP22:
                  v -= (Elf64_Addr) location;
                  *loc32 = (*loc32 & ~0x3fffff) |
                        ((v >> 2) & 0x3fffff);
                  break;

            case R_SPARC_WDISP19:
                  v -= (Elf64_Addr) location;
                  *loc32 = (*loc32 & ~0x7ffff) |
                        ((v >> 2) & 0x7ffff);
                  break;

            case R_SPARC_LO10:
                  *loc32 = (*loc32 & ~0x3ff) | (v & 0x3ff);
                  break;

            case R_SPARC_HI22:
                  *loc32 = (*loc32 & ~0x3fffff) |
                        ((v >> 10) & 0x3fffff);
                  break;

            case R_SPARC_OLO10:
                  *loc32 = (*loc32 & ~0x1fff) |
                        (((v & 0x3ff) +
                          (ELF64_R_TYPE(rel[i].r_info) >> 8))
                         & 0x1fff);
                  break;

            default:
                  printk(KERN_ERR "module %s: Unknown relocation: %x\n",
                         me->name,
                         (int) (ELF64_R_TYPE(rel[i].r_info) & 0xff));
                  return -ENOEXEC;
            };
      }
      return 0;
}

int module_finalize(const Elf_Ehdr *hdr,
                const Elf_Shdr *sechdrs,
                struct module *me)
{
      /* Cheetah's I-cache is fully coherent.  */
      if (tlb_type == spitfire) {
            unsigned long va;

            flushw_all();
            for (va =  0; va < (PAGE_SIZE << 1); va += 32)
                  spitfire_put_icache_tag(va, 0x0);
            __asm__ __volatile__("flush %g6");
      }

      return 0;
}

void module_arch_cleanup(struct module *mod)
{
}

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