source: rtems/cpukit/libdl/rtl-mdreloc-i386.c

/*
 * Taken from NetBSD and stripped of the relocations not needed on RTEMS.
 */

/*  $NetBSD: mdreloc.c,v 1.31 2010/01/14 11:58:32 skrll Exp $  */

#include <sys/cdefs.h>

#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>

#include <rtems/rtl/rtl.h>
#include "rtl-elf.h"
#include "rtl-error.h"
#include <rtems/rtl/rtl-trace.h>
#include "rtl-unwind.h"
#include "rtl-unwind-dw2.h"

uint32_t
rtems_rtl_elf_section_flags (const rtems_rtl_obj* obj,
                             const Elf_Shdr*      shdr)
{
  return 0;
}

uint32_t
rtems_rtl_elf_arch_parse_section (const rtems_rtl_obj* obj,
                                  int                  section,
                                  const char*          name,
                                  const Elf_Shdr*      shdr,
                                  const uint32_t       flags)
{
  (void) obj;
  (void) section;
  (void) name;
  (void) shdr;
  return flags;
}

bool
rtems_rtl_elf_arch_section_alloc (const rtems_rtl_obj* obj,
                                  rtems_rtl_obj_sect*  sect)
{
  (void) obj;
  (void) sect;
  return false;
}

bool
rtems_rtl_elf_arch_section_free (const rtems_rtl_obj* obj,
                                  rtems_rtl_obj_sect*  sect)
{
  (void) obj;
  (void) sect;
  return false;
}

bool
rtems_rtl_elf_rel_resolve_sym (Elf_Word type)
{
  return true;
}

uint32_t rtems_rtl_obj_tramp_alignment (const rtems_rtl_obj* obj)
{
  (void) obj;
  return sizeof(uint32_t);
}

size_t
rtems_rtl_elf_relocate_tramp_max_size (void)
{
  /*
   * Disable by returning 0.
   */
  return 0;
}

rtems_rtl_elf_rel_status
rtems_rtl_elf_relocate_rela_tramp (rtems_rtl_obj*            obj,
                                   const Elf_Rela*           rela,
                                   const rtems_rtl_obj_sect* sect,
                                   const char*               symname,
                                   const Elf_Byte            syminfo,
                                   const Elf_Word            symvalue)
{
  (void) obj;
  (void) rela;
  (void) sect;
  (void) symname;
  (void) syminfo;
  (void) symvalue;
  rtems_rtl_set_error (EINVAL, "rela type record not supported");
  return rtems_rtl_elf_rel_failure;
}

rtems_rtl_elf_rel_status
rtems_rtl_elf_relocate_rela (rtems_rtl_obj*            obj,
                             const Elf_Rela*           rel,
                             const rtems_rtl_obj_sect* sect,
                             const char*               symname,
                             const Elf_Byte            syminfo,
                             const Elf_Word            symvalue)
{
  (void) obj;
  (void) rel;
  (void) sect;
  (void) symname;
  (void) syminfo;
  (void) symvalue;
  rtems_rtl_set_error (EINVAL, "rela type record not supported");
  return rtems_rtl_elf_rel_failure;
}

rtems_rtl_elf_rel_status
rtems_rtl_elf_relocate_rel_tramp (rtems_rtl_obj*            obj,
                                  const Elf_Rel*            rel,
                                  const rtems_rtl_obj_sect* sect,
                                  const char*               symname,
                                  const Elf_Byte            syminfo,
                                  const Elf_Word            symvalue)
{
  (void) obj;
  (void) rel;
  (void) sect;
  (void) symname;
  (void) syminfo;
  (void) symvalue;
  return rtems_rtl_elf_rel_no_error;
}

rtems_rtl_elf_rel_status
rtems_rtl_elf_relocate_rel (rtems_rtl_obj*            obj,
                            const Elf_Rel*            rel,
                            const rtems_rtl_obj_sect* sect,
                            const char*               symname,
                            const Elf_Byte            syminfo,
                            const Elf_Word            symvalue)
{
  Elf_Addr  target = 0;
  Elf_Addr* where;
  Elf_Addr  tmp;

  where = (Elf_Addr *)(sect->base + rel->r_offset);

  switch (ELF_R_TYPE(rel->r_info)) {
    case R_TYPE(NONE):
      break;

    case R_TYPE(PC32):
      target = (Elf_Addr) symvalue;
      *where += target - (Elf_Addr)where;

      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
        printf ("rtl: reloc PC32 in %s --> %p (%p @ %p) in %s\n",
                sect->name, (void*) symvalue,
                (void *)*where, where, rtems_rtl_obj_oname (obj));
      break;

    case R_TYPE(GOT32):
    case R_TYPE(32):
    case R_TYPE(GLOB_DAT):
      target = (Elf_Addr) symvalue;

      tmp = target + *where;
      if (*where != tmp)
        *where = tmp;
      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
        printf ("rtl: reloc 32/GLOB_DAT in %s --> %p @ %p in %s\n",
                sect->name, (void *)*where, where,
                rtems_rtl_obj_oname (obj));
      break;

    case R_TYPE(RELATIVE):
      *where += (Elf_Addr)sect->base;
      if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC))
        printf ("rtl: reloc RELATIVE in %s --> %p @ %p\n",
                rtems_rtl_obj_oname (obj), (void *)*where, where);
      break;

    case R_TYPE(COPY):
      printf ("rtl: reloc COPY (please report)\n");
      break;

    default:
      printf ("rtl: reloc unknown: sym = %i, type = %" PRIu32 ", offset = %p, "
              "contents = %p\n",
              (int) ELF_R_SYM(rel->r_info), (uint32_t) ELF_R_TYPE(rel->r_info),
              (void *)rel->r_offset, (void *)*where);
      rtems_rtl_set_error (EINVAL,
                           "%s: Unsupported relocation type %" PRIu32 " "
                           "in non-PLT relocations",
                           sect->name, (uint32_t) ELF_R_TYPE(rel->r_info));
      return rtems_rtl_elf_rel_failure;
  }

  return rtems_rtl_elf_rel_no_error;
}

bool
rtems_rtl_elf_unwind_parse (const rtems_rtl_obj* obj,
                            const char*          name,
                            uint32_t             flags)
{
  return rtems_rtl_elf_unwind_dw2_parse (obj, name, flags);
}

bool
rtems_rtl_elf_unwind_register (rtems_rtl_obj* obj)
{
  return rtems_rtl_elf_unwind_dw2_register (obj);
}

bool
rtems_rtl_elf_unwind_deregister (rtems_rtl_obj* obj)
{
  return rtems_rtl_elf_unwind_dw2_deregister (obj);
}