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module.c

/*
 * Copyright 2004-2009 Analog Devices Inc.
 *
 * Licensed under the GPL-2 or later
 */

#define pr_fmt(fmt) "module %s: " fmt

#include <linux/moduleloader.h>
#include <linux/elf.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <linux/string.h>
#include <linux/kernel.h>
#include <asm/dma.h>
#include <asm/cacheflush.h>
#include <asm/uaccess.h>

void *module_alloc(unsigned long size)
{
      if (size == 0)
            return NULL;
      return vmalloc(size);
}

/* Free memory returned from module_alloc */
void module_free(struct module *mod, void *module_region)
{
      vfree(module_region);
}

/* Transfer the section to the L1 memory */
int
module_frob_arch_sections(Elf_Ehdr *hdr, Elf_Shdr *sechdrs,
                    char *secstrings, struct module *mod)
{
      /*
       * XXX: sechdrs are vmalloced in kernel/module.c
       * and would be vfreed just after module is loaded,
       * so we hack to keep the only information we needed
       * in mod->arch to correctly free L1 I/D sram later.
       * NOTE: this breaks the semantic of mod->arch structure.
       */
      Elf_Shdr *s, *sechdrs_end = sechdrs + hdr->e_shnum;
      void *dest;

      for (s = sechdrs; s < sechdrs_end; ++s) {
            const char *shname = secstrings + s->sh_name;

            if (s->sh_size == 0)
                  continue;

            if (!strcmp(".l1.text", shname) ||
                (!strcmp(".text", shname) &&
                 (hdr->e_flags & EF_BFIN_CODE_IN_L1))) {

                  dest = l1_inst_sram_alloc(s->sh_size);
                  mod->arch.text_l1 = dest;
                  if (dest == NULL) {
                        pr_err("L1 inst memory allocation failed\n",
                              mod->name);
                        return -1;
                  }
                  dma_memcpy(dest, (void *)s->sh_addr, s->sh_size);

            } else if (!strcmp(".l1.data", shname) ||
                       (!strcmp(".data", shname) &&
                        (hdr->e_flags & EF_BFIN_DATA_IN_L1))) {

                  dest = l1_data_sram_alloc(s->sh_size);
                  mod->arch.data_a_l1 = dest;
                  if (dest == NULL) {
                        pr_err("L1 data memory allocation failed\n",
                              mod->name);
                        return -1;
                  }
                  memcpy(dest, (void *)s->sh_addr, s->sh_size);

            } else if (!strcmp(".l1.bss", shname) ||
                       (!strcmp(".bss", shname) &&
                        (hdr->e_flags & EF_BFIN_DATA_IN_L1))) {

                  dest = l1_data_sram_zalloc(s->sh_size);
                  mod->arch.bss_a_l1 = dest;
                  if (dest == NULL) {
                        pr_err("L1 data memory allocation failed\n",
                              mod->name);
                        return -1;
                  }

            } else if (!strcmp(".l1.data.B", shname)) {

                  dest = l1_data_B_sram_alloc(s->sh_size);
                  mod->arch.data_b_l1 = dest;
                  if (dest == NULL) {
                        pr_err("L1 data memory allocation failed\n",
                              mod->name);
                        return -1;
                  }
                  memcpy(dest, (void *)s->sh_addr, s->sh_size);

            } else if (!strcmp(".l1.bss.B", shname)) {

                  dest = l1_data_B_sram_alloc(s->sh_size);
                  mod->arch.bss_b_l1 = dest;
                  if (dest == NULL) {
                        pr_err("L1 data memory allocation failed\n",
                              mod->name);
                        return -1;
                  }
                  memset(dest, 0, s->sh_size);

            } else if (!strcmp(".l2.text", shname) ||
                       (!strcmp(".text", shname) &&
                        (hdr->e_flags & EF_BFIN_CODE_IN_L2))) {

                  dest = l2_sram_alloc(s->sh_size);
                  mod->arch.text_l2 = dest;
                  if (dest == NULL) {
                        pr_err("L2 SRAM allocation failed\n",
                              mod->name);
                        return -1;
                  }
                  memcpy(dest, (void *)s->sh_addr, s->sh_size);

            } else if (!strcmp(".l2.data", shname) ||
                       (!strcmp(".data", shname) &&
                        (hdr->e_flags & EF_BFIN_DATA_IN_L2))) {

                  dest = l2_sram_alloc(s->sh_size);
                  mod->arch.data_l2 = dest;
                  if (dest == NULL) {
                        pr_err("L2 SRAM allocation failed\n",
                              mod->name);
                        return -1;
                  }
                  memcpy(dest, (void *)s->sh_addr, s->sh_size);

            } else if (!strcmp(".l2.bss", shname) ||
                       (!strcmp(".bss", shname) &&
                        (hdr->e_flags & EF_BFIN_DATA_IN_L2))) {

                  dest = l2_sram_zalloc(s->sh_size);
                  mod->arch.bss_l2 = dest;
                  if (dest == NULL) {
                        pr_err("L2 SRAM allocation failed\n",
                              mod->name);
                        return -1;
                  }

            } else
                  continue;

            s->sh_flags &= ~SHF_ALLOC;
            s->sh_addr = (unsigned long)dest;
      }

      return 0;
}

int
apply_relocate(Elf_Shdr * sechdrs, const char *strtab,
             unsigned int symindex, unsigned int relsec, struct module *me)
{
      pr_err(".rel unsupported\n", me->name);
      return -ENOEXEC;
}

/*************************************************************************/
/* FUNCTION : apply_relocate_add                                         */
/* ABSTRACT : Blackfin specific relocation handling for the loadable     */
/*            modules. Modules are expected to be .o files.              */
/*            Arithmetic relocations are handled.                        */
/*            We do not expect LSETUP to be split and hence is not       */
/*            handled.                                                   */
/*            R_BFIN_BYTE and R_BFIN_BYTE2 are also not handled as the   */
/*            gas does not generate it.                                  */
/*************************************************************************/
int
apply_relocate_add(Elf_Shdr *sechdrs, const char *strtab,
               unsigned int symindex, unsigned int relsec,
               struct module *mod)
{
      unsigned int i;
      Elf32_Rela *rel = (void *)sechdrs[relsec].sh_addr;
      Elf32_Sym *sym;
      unsigned long location, value, size;

      pr_debug("applying relocate section %u to %u\n", mod->name,
            relsec, sechdrs[relsec].sh_info);

      for (i = 0; i < sechdrs[relsec].sh_size / sizeof(*rel); i++) {
            /* This is where to make the change */
            location = sechdrs[sechdrs[relsec].sh_info].sh_addr +
                       rel[i].r_offset;

            /* This is the symbol it is referring to. Note that all
               undefined symbols have been resolved. */
            sym = (Elf32_Sym *) sechdrs[symindex].sh_addr
                + ELF32_R_SYM(rel[i].r_info);
            value = sym->st_value;
            value += rel[i].r_addend;

#ifdef CONFIG_SMP
            if (location >= COREB_L1_DATA_A_START) {
                  pr_err("cannot relocate in L1: %u (SMP kernel)",
                        mod->name, ELF32_R_TYPE(rel[i].r_info));
                  return -ENOEXEC;
            }
#endif

            pr_debug("location is %lx, value is %lx type is %d\n",
                  mod->name, location, value, ELF32_R_TYPE(rel[i].r_info));

            switch (ELF32_R_TYPE(rel[i].r_info)) {

            case R_BFIN_HUIMM16:
                  value >>= 16;
            case R_BFIN_LUIMM16:
            case R_BFIN_RIMM16:
                  size = 2;
                  break;
            case R_BFIN_BYTE4_DATA:
                  size = 4;
                  break;

            case R_BFIN_PCREL24:
            case R_BFIN_PCREL24_JUMP_L:
            case R_BFIN_PCREL12_JUMP:
            case R_BFIN_PCREL12_JUMP_S:
            case R_BFIN_PCREL10:
                  pr_err("unsupported relocation: %u (no -mlong-calls?)\n",
                        mod->name, ELF32_R_TYPE(rel[i].r_info));
                  return -ENOEXEC;

            default:
                  pr_err("unknown relocation: %u\n", mod->name,
                        ELF32_R_TYPE(rel[i].r_info));
                  return -ENOEXEC;
            }

            switch (bfin_mem_access_type(location, size)) {
            case BFIN_MEM_ACCESS_CORE:
            case BFIN_MEM_ACCESS_CORE_ONLY:
                  memcpy((void *)location, &value, size);
                  break;
            case BFIN_MEM_ACCESS_DMA:
                  dma_memcpy((void *)location, &value, size);
                  break;
            case BFIN_MEM_ACCESS_ITEST:
                  isram_memcpy((void *)location, &value, size);
                  break;
            default:
                  pr_err("invalid relocation for %#lx\n",
                        mod->name, location);
                  return -ENOEXEC;
            }
      }

      return 0;
}

int
module_finalize(const Elf_Ehdr * hdr,
            const Elf_Shdr * sechdrs, struct module *mod)
{
      unsigned int i, strindex = 0, symindex = 0;
      char *secstrings;
      long err = 0;

      secstrings = (void *)hdr + sechdrs[hdr->e_shstrndx].sh_offset;

      for (i = 1; i < hdr->e_shnum; i++) {
            /* Internal symbols and strings. */
            if (sechdrs[i].sh_type == SHT_SYMTAB) {
                  symindex = i;
                  strindex = sechdrs[i].sh_link;
            }
      }

      for (i = 1; i < hdr->e_shnum; i++) {
            const char *strtab = (char *)sechdrs[strindex].sh_addr;
            unsigned int info = sechdrs[i].sh_info;
            const char *shname = secstrings + sechdrs[i].sh_name;

            /* Not a valid relocation section? */
            if (info >= hdr->e_shnum)
                  continue;

            /* Only support RELA relocation types */
            if (sechdrs[i].sh_type != SHT_RELA)
                  continue;

            if (!strcmp(".rela.l2.text", shname) ||
                !strcmp(".rela.l1.text", shname) ||
                (!strcmp(".rela.text", shname) &&
                   (hdr->e_flags & (EF_BFIN_CODE_IN_L1 | EF_BFIN_CODE_IN_L2)))) {

                  err = apply_relocate_add((Elf_Shdr *) sechdrs, strtab,
                                 symindex, i, mod);
                  if (err < 0)
                        return -ENOEXEC;
            }
      }

      return 0;
}

void module_arch_cleanup(struct module *mod)
{
      l1_inst_sram_free(mod->arch.text_l1);
      l1_data_A_sram_free(mod->arch.data_a_l1);
      l1_data_A_sram_free(mod->arch.bss_a_l1);
      l1_data_B_sram_free(mod->arch.data_b_l1);
      l1_data_B_sram_free(mod->arch.bss_b_l1);
      l2_sram_free(mod->arch.text_l2);
      l2_sram_free(mod->arch.data_l2);
      l2_sram_free(mod->arch.bss_l2);
}

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