Fix potential illegal memory access when disassembling corrupt RX binaries.

[deliverable/binutils-gdb.git] / bfd / cpu-powerpc.c

/* BFD PowerPC CPU definition
   Copyright (C) 1994-2019 Free Software Foundation, Inc.
   Contributed by Ian Lance Taylor, Cygnus Support.

   This file is part of BFD, the Binary File Descriptor library.

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
   MA 02110-1301, USA.  */

#include "sysdep.h"
#include "bfd.h"
#include "libbfd.h"

/* The common PowerPC architecture is compatible with the RS/6000.  */

static const bfd_arch_info_type *
powerpc_compatible (const bfd_arch_info_type *a,
		    const bfd_arch_info_type *b)
{
  BFD_ASSERT (a->arch == bfd_arch_powerpc);
  switch (b->arch)
    {
    default:
      return NULL;
    case bfd_arch_powerpc:
      if (a->mach == bfd_mach_ppc_vle && b->bits_per_word == 32)
	return a;
      if (b->mach == bfd_mach_ppc_vle && a->bits_per_word == 32)
	return b;
      return bfd_default_compatible (a, b);
    case bfd_arch_rs6000:
      if (b->mach == bfd_mach_rs6k)
	return a;
      return NULL;
    }
  /*NOTREACHED*/
}

#define N(BITS, NUMBER, PRINT, DEFAULT, NEXT)		\
  {							\
    BITS,      /* Bits in a word.  */			\
    BITS,      /* Bits in an address.  */		\
    8,	       /* Bits in a byte.  */			\
    bfd_arch_powerpc,					\
    NUMBER,						\
    "powerpc",						\
    PRINT,						\
    3,		/* Section alignment power.  */		\
    DEFAULT,						\
    powerpc_compatible,					\
    bfd_default_scan,					\
    bfd_arch_default_fill,				\
    NEXT,						\
    0 /* Maximum offset of a reloc from the start of an insn.  */ \
  }

const bfd_arch_info_type bfd_powerpc_archs[] =
{
#if BFD_DEFAULT_TARGET_SIZE == 64
  /* Default for 64 bit target.  */
  N (64, bfd_mach_ppc64, "powerpc:common64", TRUE, bfd_powerpc_archs + 1),
  /* elf32-ppc:ppc_elf_object_p relies on the default 32 bit arch
     being immediately after the 64 bit default.  */
  N (32, bfd_mach_ppc, "powerpc:common", FALSE, bfd_powerpc_archs + 2),
#else
  /* Default arch must come first.  */
  N (32, bfd_mach_ppc, "powerpc:common", TRUE, bfd_powerpc_archs + 1),
  /* elf64-ppc:ppc64_elf_object_p relies on the default 64 bit arch
     being immediately after the 32 bit default.  */
  N (64, bfd_mach_ppc64, "powerpc:common64", FALSE, bfd_powerpc_archs + 2),
#endif
  N (32, bfd_mach_ppc_603,      "powerpc:603",     FALSE, bfd_powerpc_archs + 3),
  N (32, bfd_mach_ppc_ec603e,   "powerpc:EC603e",  FALSE, bfd_powerpc_archs + 4),
  N (32, bfd_mach_ppc_604,      "powerpc:604",     FALSE, bfd_powerpc_archs + 5),
  N (32, bfd_mach_ppc_403,      "powerpc:403",     FALSE, bfd_powerpc_archs + 6),
  N (32, bfd_mach_ppc_601,      "powerpc:601",     FALSE, bfd_powerpc_archs + 7),
  N (64, bfd_mach_ppc_620,      "powerpc:620",     FALSE, bfd_powerpc_archs + 8),
  N (64, bfd_mach_ppc_630,      "powerpc:630",     FALSE, bfd_powerpc_archs + 9),
  N (64, bfd_mach_ppc_a35,      "powerpc:a35",     FALSE, bfd_powerpc_archs + 10),
  N (64, bfd_mach_ppc_rs64ii,   "powerpc:rs64ii",  FALSE, bfd_powerpc_archs + 11),
  N (64, bfd_mach_ppc_rs64iii,  "powerpc:rs64iii", FALSE, bfd_powerpc_archs + 12),
  N (32, bfd_mach_ppc_7400,     "powerpc:7400",    FALSE, bfd_powerpc_archs + 13),
  N (32, bfd_mach_ppc_e500,     "powerpc:e500",    FALSE, bfd_powerpc_archs + 14),
  N (32, bfd_mach_ppc_e500mc,   "powerpc:e500mc",  FALSE, bfd_powerpc_archs + 15),
  N (64, bfd_mach_ppc_e500mc64, "powerpc:e500mc64",FALSE, bfd_powerpc_archs + 16),
  N (32, bfd_mach_ppc_860,      "powerpc:MPC8XX",  FALSE, bfd_powerpc_archs + 17),
  N (32, bfd_mach_ppc_750,      "powerpc:750",     FALSE, bfd_powerpc_archs + 18),
  N (32, bfd_mach_ppc_titan,    "powerpc:titan",   FALSE, bfd_powerpc_archs + 19),

  {
    16,	/* Bits in a word.  */
    32,	/* Bits in an address.  */
    8,	/* Bits in a byte.  */
    bfd_arch_powerpc,
    bfd_mach_ppc_vle,
    "powerpc",
    "powerpc:vle",
    3,
    FALSE, /* Not the default.  */
    powerpc_compatible,
    bfd_default_scan,
    bfd_arch_default_fill,
    bfd_powerpc_archs + 20,
    0 /* Maximum offset of a reloc from the start of an insn.  */
  },

  N (64, bfd_mach_ppc_e5500, "powerpc:e5500", FALSE, bfd_powerpc_archs + 21),
  N (64, bfd_mach_ppc_e6500, "powerpc:e6500", FALSE, NULL)
};