示例#1
0
static CORE_ADDR
ppc_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
{
  unsigned int insnbuf[POWERPC32_PLT_STUB_LEN];
  struct gdbarch *gdbarch = get_frame_arch (frame);
  struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  enum bfd_endian byte_order = gdbarch_byte_order (gdbarch);
  CORE_ADDR target = 0;

  if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub, insnbuf))
    {
      /* Insn pattern is
		lis   r11, xxxx
		lwz   r11, xxxx(r11)
	 Branch target is in r11.  */

      target = (ppc_insn_d_field (insnbuf[0]) << 16)
	| ppc_insn_d_field (insnbuf[1]);
      target = read_memory_unsigned_integer (target, 4, byte_order);
    }

  if (ppc_insns_match_pattern (frame, pc, powerpc32_plt_stub_so, insnbuf))
    {
      /* Insn pattern is
		lwz   r11, xxxx(r30)
	 Branch target is in r11.  */

      target = get_frame_register_unsigned (frame, tdep->ppc_gp0_regnum + 30)
	       + ppc_insn_d_field (insnbuf[0]);
      target = read_memory_unsigned_integer (target, 4, byte_order);
    }

  return target;
}
示例#2
0
文件: ppc64-tdep.c 项目: 5kg/gdb
CORE_ADDR
ppc64_skip_trampoline_code (struct frame_info *frame, CORE_ADDR pc)
{
#define MAX(a,b) ((a) > (b) ? (a) : (b))
  unsigned int insns[MAX (MAX (ARRAY_SIZE (ppc64_standard_linkage1),
			       ARRAY_SIZE (ppc64_standard_linkage2)),
			  ARRAY_SIZE (ppc64_standard_linkage3)) - 1];
  CORE_ADDR target;

  if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage3, insns)
      && (insns[8] != 0 || insns[9] != 0))
    pc = ppc64_standard_linkage3_target (frame, pc, insns);
  else if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage2, insns)
	   && (insns[10] != 0 || insns[11] != 0))
    pc = ppc64_standard_linkage2_target (frame, pc, insns);
  else if (ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage1, insns))
    pc = ppc64_standard_linkage1_target (frame, pc, insns);
  else
    return 0;

  /* The PLT descriptor will either point to the already resolved target
     address, or else to a glink stub.  As the latter carry synthetic @plt
     symbols, find_solib_trampoline_target should be able to resolve them.  */
  target = find_solib_trampoline_target (frame, pc);
  return target ? target : pc;
}
示例#3
0
static CORE_ADDR
ppc64_skip_trampoline_code_1 (struct frame_info *frame, CORE_ADDR pc)
{
#define MAX(a,b) ((a) > (b) ? (a) : (b))
  unsigned int insns[MAX (MAX (MAX (ARRAY_SIZE (ppc64_standard_linkage1),
				    ARRAY_SIZE (ppc64_standard_linkage2)),
			       MAX (ARRAY_SIZE (ppc64_standard_linkage3),
				    ARRAY_SIZE (ppc64_standard_linkage4))),
			  MAX (MAX (ARRAY_SIZE (ppc64_standard_linkage5),
				    ARRAY_SIZE (ppc64_standard_linkage6)),
			       MAX (ARRAY_SIZE (ppc64_standard_linkage7),
				    ARRAY_SIZE (ppc64_standard_linkage8))))
		     - 1];
  CORE_ADDR target;
  int scan_limit, i;

  scan_limit = 1;
  /* When reverse-debugging, scan backward to check whether we are
     in the middle of trampoline code.  */
  if (execution_direction == EXEC_REVERSE)
    scan_limit = ARRAY_SIZE (insns) - 1;

  for (i = 0; i < scan_limit; i++)
    {
      if (i < ARRAY_SIZE (ppc64_standard_linkage8) - 1
	  && ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage8, insns))
	pc = ppc64_standard_linkage4_target (frame, insns);
      else if (i < ARRAY_SIZE (ppc64_standard_linkage7) - 1
	       && ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage7,
					   insns))
	pc = ppc64_standard_linkage3_target (frame, insns);
      else if (i < ARRAY_SIZE (ppc64_standard_linkage6) - 1
	       && ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage6,
					   insns))
	pc = ppc64_standard_linkage4_target (frame, insns);
      else if (i < ARRAY_SIZE (ppc64_standard_linkage5) - 1
	       && ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage5,
					   insns)
	       && (insns[8] != 0 || insns[9] != 0))
	pc = ppc64_standard_linkage3_target (frame, insns);
      else if (i < ARRAY_SIZE (ppc64_standard_linkage4) - 1
	       && ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage4,
					   insns)
	       && (insns[9] != 0 || insns[10] != 0))
	pc = ppc64_standard_linkage4_target (frame, insns);
      else if (i < ARRAY_SIZE (ppc64_standard_linkage3) - 1
	       && ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage3,
					   insns)
	       && (insns[8] != 0 || insns[9] != 0))
	pc = ppc64_standard_linkage3_target (frame, insns);
      else if (i < ARRAY_SIZE (ppc64_standard_linkage2) - 1
	       && ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage2,
					   insns)
	       && (insns[10] != 0 || insns[11] != 0))
	pc = ppc64_standard_linkage2_target (frame, insns);
      else if (i < ARRAY_SIZE (ppc64_standard_linkage1) - 1
	       && ppc_insns_match_pattern (frame, pc, ppc64_standard_linkage1,
					   insns))
	pc = ppc64_standard_linkage1_target (frame, insns);
      else
	{
	  /* Scan backward one more instructions if doesn't match.  */
	  pc -= 4;
	  continue;
	}

      /* The PLT descriptor will either point to the already resolved target
         address, or else to a glink stub.  As the latter carry synthetic @plt
         symbols, find_solib_trampoline_target should be able to resolve them.  */
      target = find_solib_trampoline_target (frame, pc);
      return target ? target : pc;
  }

  return 0;
}