[deliverable/binutils-gdb.git] / bfd / elf32-s12z.c

/* Freescale S12Z-specific support for 32-bit ELF
   Copyright (C) 1999-2018 Free Software Foundation, Inc.
   (Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com))

   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 "bfdlink.h"
#include "libbfd.h"
#include "elf-bfd.h"

#include "elf/s12z.h"

/* Relocation functions.  */
static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
  (bfd *, bfd_reloc_code_real_type);
static bfd_boolean s12z_info_to_howto_rel
  (bfd *, arelent *, Elf_Internal_Rela *);

static bfd_reloc_status_type
opru18_reloc (bfd *abfd, arelent *reloc_entry, struct bfd_symbol *symbol,
		    void *data, asection *input_section ATTRIBUTE_UNUSED,
		    bfd *output ATTRIBUTE_UNUSED, char **msg ATTRIBUTE_UNUSED)
{
  /* This reloc is used for 18 bit General Operand Addressing Postbyte in the
     INST opru18 form.  This is an 18 bit reloc, but the most significant bit
     is shifted one place to the left of where it would normally be.  See
     Appendix A.4 of the S12Z reference manual.  */

  bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
  bfd_vma result = bfd_get_24 (abfd, (unsigned char *) data + octets);
  bfd_vma val = bfd_asymbol_value (symbol);

  /* Keep the wanted bits and discard the rest.  */
  result &= 0xFA0000;

  val += symbol->section->output_section->vma;
  val += symbol->section->output_offset;

  /* The lowest 17 bits are copied verbatim.  */
  result |= val & 0x1FFFF;

  /* The 18th bit is put into the 19th position.  */
  result |= (val & 0x020000) << 1;

  bfd_put_24 (abfd, result, (unsigned char *) data + octets);

  return bfd_reloc_ok;
}


static bfd_reloc_status_type
shift_addend_reloc (bfd *abfd, arelent *reloc_entry, struct bfd_symbol *symbol ATTRIBUTE_UNUSED,
		    void *data ATTRIBUTE_UNUSED, asection *input_section ATTRIBUTE_UNUSED,
		    bfd *output ATTRIBUTE_UNUSED, char **msg ATTRIBUTE_UNUSED)
{
  /* This is a really peculiar reloc, which is done for compatibility
     with the Freescale toolchain.

     That toolchain appears to (ab)use the lowest 15 bits of the addend for
     the purpose of holding flags.  The purpose of these flags are unknown.
     So in this function, when writing the bfd we left shift the addend by
     15, and when reading we right shift it by 15 (discarding the lower bits).

     This allows the linker to work with object files generated by Freescale,
     as well as by Gas.  */

  if (abfd->is_linker_input)
    reloc_entry->addend >>= 15;
  else
    reloc_entry->addend <<= 15;

  return bfd_reloc_continue;
}

#define USE_REL	0

static reloc_howto_type elf_s12z_howto_table[] =
{
  /* This reloc does nothing.  */
  HOWTO (R_S12Z_NONE,	/* type */
	 0,			/* rightshift */
	 3,			/* size (0 = byte, 1 = short, 2 = long) */
	 0,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_S12Z_NONE",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 24 bit absolute relocation emitted by the OPR mode operands  */
  HOWTO (R_S12Z_OPR,        /* type */
	 0,			/* rightshift */
	 5,			/* size (0 = byte, 1 = short, 2 = long) */
	 24,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,	/* complain_on_overflow */
	 shift_addend_reloc,
	 "R_S12Z_OPR",	/* name */
	 FALSE,			/* partial_inplace */
	 0x00000000,            /* src_mask */
	 0x00ffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* The purpose of this reloc is not known */
  HOWTO (R_S12Z_UKNWN_2,	/* type */
	 0,			/* rightshift */
	 3,			/* size (0 = byte, 1 = short, 2 = long) */
	 0,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_dont,/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_S12Z_UKNWN_2",	/* name */
	 FALSE,			/* partial_inplace */
	 0,			/* src_mask */
	 0,			/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 15 bit PC-rel relocation */
  HOWTO (R_S12Z_PCREL_7_15,	/* type */
	 0,			/* rightshift */
	 1,			/* size (0 = byte, 1 = short, 2 = long) */
	 15,			/* bitsize */
	 TRUE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,	/* complain_on_overflow */
	 shift_addend_reloc,
	 "R_S12Z_PCREL_7_15",	/* name */
	 FALSE,			/* partial_inplace */
	 0x00,                  /* src_mask */
	 0x007fff,		/* dst_mask */
	 TRUE),		/* pcrel_offset */

  /* A 24 bit absolute relocation emitted by EXT24 mode operands */
  HOWTO (R_S12Z_EXT24,        /* type */
	 0,			/* rightshift */
	 5,			/* size (0 = byte, 1 = short, 2 = long) */
	 24,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_S12Z_EXT24",	/* name */
	 FALSE,			/* partial_inplace */
	 0x00000000,            /* src_mask */
	 0x00ffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* An 18 bit absolute relocation */
  HOWTO (R_S12Z_EXT18,        /* type */
	 0,			/* rightshift */
	 5,			/* size (0 = byte, 1 = short, 2 = long) */
	 18,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,	/* complain_on_overflow */
	 opru18_reloc,	        /* special_function */
	 "R_S12Z_EXT18",	/* name */
	 FALSE,			/* partial_inplace */
	 0x00000000,            /* src_mask */
	 0x0005ffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */

  /* A 32 bit absolute relocation  */
  HOWTO (R_S12Z_EXT32,        /* type */
	 0,			/* rightshift */
	 2,			/* size (0 = byte, 1 = short, 2 = long) */
	 32,			/* bitsize */
	 FALSE,			/* pc_relative */
	 0,			/* bitpos */
	 complain_overflow_bitfield,	/* complain_on_overflow */
	 bfd_elf_generic_reloc,	/* special_function */
	 "R_S12Z_EXT32",	/* name */
	 FALSE,			/* partial_inplace */
	 0x00000000,            /* src_mask */
	 0xffffffff,		/* dst_mask */
	 FALSE),		/* pcrel_offset */
};

/* Map BFD reloc types to S12Z ELF reloc types.  */

struct s12z_reloc_map
{
  bfd_reloc_code_real_type bfd_reloc_val;
  unsigned char elf_reloc_val;
};

static const struct s12z_reloc_map s12z_reloc_map[] =
{
  /* bfd reloc val */ /* elf reloc val */
  {BFD_RELOC_NONE, R_S12Z_NONE},
  {BFD_RELOC_32, R_S12Z_EXT32},
  {BFD_RELOC_24, R_S12Z_EXT24},
  {BFD_RELOC_16_PCREL, R_S12Z_PCREL_7_15}
};

static reloc_howto_type *
bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
				 bfd_reloc_code_real_type code)
{
  unsigned int i;

  for (i = 0;
       i < sizeof (s12z_reloc_map) / sizeof (struct s12z_reloc_map);
       i++)
    {
      if (s12z_reloc_map[i].bfd_reloc_val == code)
	{
	  return &elf_s12z_howto_table[s12z_reloc_map[i].elf_reloc_val];
	}
    }

  printf ("%s:%d Not found type %d\n", __FILE__, __LINE__, code);

  return NULL;
}

static reloc_howto_type *
bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
				 const char *r_name)
{
  unsigned int i;

  for (i = 0;
       i < (sizeof (elf_s12z_howto_table)
	    / sizeof (elf_s12z_howto_table[0]));
       i++)
    if (elf_s12z_howto_table[i].name != NULL
	&& strcasecmp (elf_s12z_howto_table[i].name, r_name) == 0)
      return &elf_s12z_howto_table[i];

  return NULL;
}

/* Set the howto pointer for an S12Z ELF reloc.  */

static bfd_boolean
s12z_info_to_howto_rel (bfd *abfd,
			  arelent *cache_ptr, Elf_Internal_Rela *dst)
{
  unsigned int  r_type = ELF32_R_TYPE (dst->r_info);

  if (r_type >= (unsigned int) R_S12Z_max)
    {
      /* xgettext:c-format */
      _bfd_error_handler (_("%pB: unsupported relocation type %#x"),
			  abfd, r_type);
      bfd_set_error (bfd_error_bad_value);
      return FALSE;
    }

  cache_ptr->howto = &elf_s12z_howto_table[r_type];
  return TRUE;
}

static bfd_boolean
s12z_elf_set_mach_from_flags (bfd *abfd)
{
  bfd_default_set_arch_mach (abfd, bfd_arch_s12z, 0);

  return TRUE;
}

#define ELF_ARCH		bfd_arch_s12z
#define ELF_MACHINE_CODE	EM_S12Z
#define ELF_MAXPAGESIZE		0x1000

#define TARGET_BIG_SYM		s12z_elf32_vec
#define TARGET_BIG_NAME		"elf32-s12z"

#define elf_info_to_howto			NULL
#define elf_info_to_howto_rel			s12z_info_to_howto_rel
#define elf_backend_object_p			s12z_elf_set_mach_from_flags
#define elf_backend_final_write_processing	NULL
#define elf_backend_can_gc_sections		1

#include "elf32-target.h"
Commit	Line	Data
7b4ae824 JD	1	/* Freescale S12Z-specific support for 32-bit ELF
	2	Copyright (C) 1999-2018 Free Software Foundation, Inc.
	3	(Heavily copied from the D10V port by Martin Hunt (hunt@cygnus.com))
	4
	5	This file is part of BFD, the Binary File Descriptor library.
	6
	7	This program is free software; you can redistribute it and/or modify
	8	it under the terms of the GNU General Public License as published by
	9	the Free Software Foundation; either version 3 of the License, or
	10	(at your option) any later version.
	11
	12	This program is distributed in the hope that it will be useful,
	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	15	GNU General Public License for more details.
	16
	17	You should have received a copy of the GNU General Public License
	18	along with this program; if not, write to the Free Software
	19	Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston,
	20	MA 02110-1301, USA. */
	21
	22	#include "sysdep.h"
	23	#include "bfd.h"
	24	#include "bfdlink.h"
	25	#include "libbfd.h"
	26	#include "elf-bfd.h"
	27
	28	#include "elf/s12z.h"
	29
	30	/* Relocation functions. */
	31	static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
	32	(bfd *, bfd_reloc_code_real_type);
	33	static bfd_boolean s12z_info_to_howto_rel
	34	(bfd , arelent , Elf_Internal_Rela *);
	35
4e57b456 JD	36	static bfd_reloc_status_type
	37	opru18_reloc (bfd abfd, arelent reloc_entry, struct bfd_symbol *symbol,
	38	void data, asection input_section ATTRIBUTE_UNUSED,
	39	bfd output ATTRIBUTE_UNUSED, char *msg ATTRIBUTE_UNUSED)
	40	{
	41	/* This reloc is used for 18 bit General Operand Addressing Postbyte in the
	42	INST opru18 form. This is an 18 bit reloc, but the most significant bit
	43	is shifted one place to the left of where it would normally be. See
	44	Appendix A.4 of the S12Z reference manual. */
	45
	46	bfd_size_type octets = reloc_entry->address * bfd_octets_per_byte (abfd);
	47	bfd_vma result = bfd_get_24 (abfd, (unsigned char *) data + octets);
	48	bfd_vma val = bfd_asymbol_value (symbol);
	49
	50	/* Keep the wanted bits and discard the rest. */
	51	result &= 0xFA0000;
	52
	53	val += symbol->section->output_section->vma;
	54	val += symbol->section->output_offset;
	55
	56	/* The lowest 17 bits are copied verbatim. */
	57	result \|= val & 0x1FFFF;
	58
	59	/* The 18th bit is put into the 19th position. */
	60	result \|= (val & 0x020000) << 1;
	61
	62	bfd_put_24 (abfd, result, (unsigned char *) data + octets);
	63
	64	return bfd_reloc_ok;
	65	}
	66
	67
7b4ae824 JD	68	static bfd_reloc_status_type
	69	shift_addend_reloc (bfd abfd, arelent reloc_entry, struct bfd_symbol *symbol ATTRIBUTE_UNUSED,
	70	void data ATTRIBUTE_UNUSED, asection input_section ATTRIBUTE_UNUSED,
	71	bfd output ATTRIBUTE_UNUSED, char *msg ATTRIBUTE_UNUSED)
	72	{
	73	/* This is a really peculiar reloc, which is done for compatibility
	74	with the Freescale toolchain.
	75
	76	That toolchain appears to (ab)use the lowest 15 bits of the addend for
	77	the purpose of holding flags. The purpose of these flags are unknown.
	78	So in this function, when writing the bfd we left shift the addend by
	79	15, and when reading we right shift it by 15 (discarding the lower bits).
	80
	81	This allows the linker to work with object files generated by Freescale,
	82	as well as by Gas. */
	83
	84	if (abfd->is_linker_input)
	85	reloc_entry->addend >>= 15;
	86	else
	87	reloc_entry->addend <<= 15;
	88
	89	return bfd_reloc_continue;
	90	}
	91
	92	#define USE_REL 0
	93
	94	static reloc_howto_type elf_s12z_howto_table[] =
	95	{
	96	/* This reloc does nothing. */
	97	HOWTO (R_S12Z_NONE, /* type */
	98	0, /* rightshift */
	99	3, /* size (0 = byte, 1 = short, 2 = long) */
	100	0, /* bitsize */
	101	FALSE, /* pc_relative */
	102	0, /* bitpos */
	103	complain_overflow_dont,/* complain_on_overflow */
	104	bfd_elf_generic_reloc, /* special_function */
	105	"R_S12Z_NONE", /* name */
	106	FALSE, /* partial_inplace */
	107	0, /* src_mask */
	108	0, /* dst_mask */
	109	FALSE), /* pcrel_offset */
	110
	111	/* A 24 bit absolute relocation emitted by the OPR mode operands */
	112	HOWTO (R_S12Z_OPR, /* type */
	113	0, /* rightshift */
	114	5, /* size (0 = byte, 1 = short, 2 = long) */
	115	24, /* bitsize */
	116	FALSE, /* pc_relative */
	117	0, /* bitpos */
	118	complain_overflow_bitfield, /* complain_on_overflow */
	119	shift_addend_reloc,
	120	"R_S12Z_OPR", /* name */
	121	FALSE, /* partial_inplace */
808325d2	122	0x00000000, /* src_mask */
7b4ae824 JD	123	0x00ffffff, /* dst_mask */
	124	FALSE), /* pcrel_offset */
	125
	126	/* The purpose of this reloc is not known */
	127	HOWTO (R_S12Z_UKNWN_2, /* type */
	128	0, /* rightshift */
	129	3, /* size (0 = byte, 1 = short, 2 = long) */
	130	0, /* bitsize */
	131	FALSE, /* pc_relative */
	132	0, /* bitpos */
	133	complain_overflow_dont,/* complain_on_overflow */
	134	bfd_elf_generic_reloc, /* special_function */
	135	"R_S12Z_UKNWN_2", /* name */
	136	FALSE, /* partial_inplace */
	137	0, /* src_mask */
	138	0, /* dst_mask */
	139	FALSE), /* pcrel_offset */
	140
	141	/* A 15 bit PC-rel relocation */
	142	HOWTO (R_S12Z_PCREL_7_15, /* type */
	143	0, /* rightshift */
	144	1, /* size (0 = byte, 1 = short, 2 = long) */
	145	15, /* bitsize */
	146	TRUE, /* pc_relative */
	147	0, /* bitpos */
	148	complain_overflow_bitfield, /* complain_on_overflow */
	149	shift_addend_reloc,
	150	"R_S12Z_PCREL_7_15", /* name */
	151	FALSE, /* partial_inplace */
	152	0x00, /* src_mask */
	153	0x007fff, /* dst_mask */
	154	TRUE), /* pcrel_offset */
	155
	156	/* A 24 bit absolute relocation emitted by EXT24 mode operands */
	157	HOWTO (R_S12Z_EXT24, /* type */
	158	0, /* rightshift */
	159	5, /* size (0 = byte, 1 = short, 2 = long) */
	160	24, /* bitsize */
	161	FALSE, /* pc_relative */
	162	0, /* bitpos */
	163	complain_overflow_bitfield, /* complain_on_overflow */
	164	bfd_elf_generic_reloc, /* special_function */
	165	"R_S12Z_EXT24", /* name */
	166	FALSE, /* partial_inplace */
808325d2	167	0x00000000, /* src_mask */
7b4ae824 JD	168	0x00ffffff, /* dst_mask */
	169	FALSE), /* pcrel_offset */
	170
4e57b456 JD	171	/* An 18 bit absolute relocation */
4e57b456 JD	172	HOWTO (R_S12Z_EXT18, /* type */
7b4ae824	173	0, /* rightshift */
4e57b456 JD	174	5, /* size (0 = byte, 1 = short, 2 = long) */
4e57b456 JD	175	18, /* bitsize */
7b4ae824 JD	176	FALSE, /* pc_relative */
7b4ae824 JD	177	0, /* bitpos */
4e57b456 JD	178	complain_overflow_bitfield, /* complain_on_overflow */
	179	opru18_reloc, /* special_function */
	180	"R_S12Z_EXT18", /* name */
7b4ae824	181	FALSE, /* partial_inplace */
808325d2	182	0x00000000, /* src_mask */
4e57b456	183	0x0005ffff, /* dst_mask */
7b4ae824 JD	184	FALSE), /* pcrel_offset */
	185
	186	/* A 32 bit absolute relocation */
	187	HOWTO (R_S12Z_EXT32, /* type */
	188	0, /* rightshift */
	189	2, /* size (0 = byte, 1 = short, 2 = long) */
	190	32, /* bitsize */
	191	FALSE, /* pc_relative */
	192	0, /* bitpos */
	193	complain_overflow_bitfield, /* complain_on_overflow */
	194	bfd_elf_generic_reloc, /* special_function */
	195	"R_S12Z_EXT32", /* name */
	196	FALSE, /* partial_inplace */
808325d2	197	0x00000000, /* src_mask */
7b4ae824 JD	198	0xffffffff, /* dst_mask */
	199	FALSE), /* pcrel_offset */
	200	};
	201
	202	/* Map BFD reloc types to S12Z ELF reloc types. */
	203
	204	struct s12z_reloc_map
	205	{
	206	bfd_reloc_code_real_type bfd_reloc_val;
	207	unsigned char elf_reloc_val;
	208	};
	209
	210	static const struct s12z_reloc_map s12z_reloc_map[] =
	211	{
	212	/* bfd reloc val / / elf reloc val */
	213	{BFD_RELOC_NONE, R_S12Z_NONE},
	214	{BFD_RELOC_32, R_S12Z_EXT32},
	215	{BFD_RELOC_24, R_S12Z_EXT24},
	216	{BFD_RELOC_16_PCREL, R_S12Z_PCREL_7_15}
	217	};
	218
	219	static reloc_howto_type *
	220	bfd_elf32_bfd_reloc_type_lookup (bfd *abfd ATTRIBUTE_UNUSED,
	221	bfd_reloc_code_real_type code)
	222	{
	223	unsigned int i;
	224
	225	for (i = 0;
	226	i < sizeof (s12z_reloc_map) / sizeof (struct s12z_reloc_map);
	227	i++)
	228	{
	229	if (s12z_reloc_map[i].bfd_reloc_val == code)
	230	{
	231	return &elf_s12z_howto_table[s12z_reloc_map[i].elf_reloc_val];
	232	}
	233	}
	234
	235	printf ("%s:%d Not found type %d\n", __FILE__, __LINE__, code);
	236
	237	return NULL;
	238	}
	239
	240	static reloc_howto_type *
	241	bfd_elf32_bfd_reloc_name_lookup (bfd *abfd ATTRIBUTE_UNUSED,
	242	const char *r_name)
	243	{
	244	unsigned int i;
	245
7b4ae824 JD	246	for (i = 0;
	247	i < (sizeof (elf_s12z_howto_table)
	248	/ sizeof (elf_s12z_howto_table[0]));
	249	i++)
	250	if (elf_s12z_howto_table[i].name != NULL
	251	&& strcasecmp (elf_s12z_howto_table[i].name, r_name) == 0)
	252	return &elf_s12z_howto_table[i];
	253
	254	return NULL;
	255	}
	256
	257	/* Set the howto pointer for an S12Z ELF reloc. */
	258
	259	static bfd_boolean
	260	s12z_info_to_howto_rel (bfd *abfd,
	261	arelent cache_ptr, Elf_Internal_Rela dst)
	262	{
	263	unsigned int r_type = ELF32_R_TYPE (dst->r_info);
	264
	265	if (r_type >= (unsigned int) R_S12Z_max)
	266	{
	267	/* xgettext:c-format */
	268	_bfd_error_handler (_("%pB: unsupported relocation type %#x"),
	269	abfd, r_type);
	270	bfd_set_error (bfd_error_bad_value);
	271	return FALSE;
	272	}
	273
	274	cache_ptr->howto = &elf_s12z_howto_table[r_type];
	275	return TRUE;
	276	}
	277
	278	static bfd_boolean
	279	s12z_elf_set_mach_from_flags (bfd *abfd)
	280	{
cd4d353f	281	bfd_default_set_arch_mach (abfd, bfd_arch_s12z, 0);
7b4ae824 JD	282
	283	return TRUE;
	284	}
	285
	286	#define ELF_ARCH bfd_arch_s12z
7b4ae824 JD	287	#define ELF_MACHINE_CODE EM_S12Z
	288	#define ELF_MAXPAGESIZE 0x1000
	289
	290	#define TARGET_BIG_SYM s12z_elf32_vec
	291	#define TARGET_BIG_NAME "elf32-s12z"
	292
	293	#define elf_info_to_howto NULL
	294	#define elf_info_to_howto_rel s12z_info_to_howto_rel
	295	#define elf_backend_object_p s12z_elf_set_mach_from_flags
	296	#define elf_backend_final_write_processing NULL
	297	#define elf_backend_can_gc_sections 1
	298
	299	#include "elf32-target.h"