source: rtems/cpukit/libdl/rtl-mdreloc-bfin.c @ 3feb372

#include <sys/cdefs.h>

#include <stdio.h>
#include <rtems/rtl/rtl.h>
#include <errno.h>
#include "rtl-elf.h"
#include "rtl-error.h"
#include "rtl-trace.h"

bool
rtems_rtl_elf_rel_resolve_sym (Elf_Word type)
{
  return true;
}

static inline Elf_Addr
load_ptr(void *where)
{
        Elf_Addr res;

        memcpy(&res, where, sizeof(res));

        return (res);
}

bool
rtems_rtl_elf_relocate_rela (const rtems_rtl_obj_t*      obj,
                             const Elf_Rela*             rela,
                             const rtems_rtl_obj_sect_t* sect,
                             const char*                 symname,
                             const Elf_Byte              syminfo,
                             const Elf_Word              symvalue)
{
  Elf_Addr      target = 0;
  Elf_Addr      *where;
  Elf_Word      tmp;
  Elf_Word      size; //byte

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

  if (rtems_rtl_trace (RTEMS_RTL_TRACE_RELOC)) {
      printf("rela relocation type is %d relocated address 0x%08x",
              ELF_R_TYPE(rela->r_info), where);
  }

  tmp = symvalue;
  switch (ELF_R_TYPE(rela->r_info)) {
    case R_TYPE(UNUSED0):
      break;

    case R_TYPE(HUIMM16):
      tmp = symvalue >> 16;
    case R_TYPE(LUIMM16):
    case R_TYPE(RIMM16):
      size = 2;
      break;

    case R_TYPE(BYTE4_DATA):
      size = 4;
      break;

    case R_TYPE(PCREL24):
    case R_TYPE(PCREL24_JU):
      where = (Elf_Addr*)((Elf_Addr)where - 2); /* Back 2 bytes */
      tmp = symvalue - (Elf_Addr)where;
      tmp >>= 1;
      if ((tmp & 0x20000000) == 0x20000000)
        tmp |= 0xc0000000;

      if ((tmp & 0xff000000) && (~tmp & 0xff800000)) {
        printf("PCREL24/PCREL24_JU Overflow\n");
        return false;
      }

      tmp = (load_ptr(where) & 0x0000ff00) | ((tmp & 0x0000ffff) << 16) |
             ((tmp & 0x00ff0000) >> 16);
      size = 4;
      break;

    case R_TYPE(PCREL12_JUMP_S):
      tmp = symvalue - (Elf_Addr)where;
      tmp >>= 1;
      if ((tmp & 0x20000000) == 0x20000000)
        tmp |= 0xc0000000;

      if ((tmp & 0xfffff000) && (~tmp & 0xfffff800)) {
        printf("PCREL12_JUMP_S Overflow\n");
        return false;
      }

      tmp = ((*(uint16_t *)where) & 0xf000) | (tmp & 0xfff);
      size = 2;
      break;

    default:
      printf("Unspported rela type\n");
      return false;
  }

  memcpy((void*)where, &tmp, size);

  return true;
}

bool
rtems_rtl_elf_relocate_rel (const rtems_rtl_obj_t*      obj,
                            const Elf_Rel*              rel,
                            const rtems_rtl_obj_sect_t* sect,
                            const char*                 symname,
                            const Elf_Byte              syminfo,
                            const Elf_Word              symvalue)
{
  rtems_rtl_set_error (EINVAL, "rel type record not supported");
  return false;
}