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- /* Freescale S12Z-specific support for 32-bit ELF
- Copyright (C) 1999-2022 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"
- /* All users of this file have bfd_octets_per_byte (abfd, sec) == 1. */
- #define OCTETS_PER_BYTE(ABFD, SEC) 1
- /* Relocation functions. */
- static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
- (bfd *, bfd_reloc_code_real_type);
- static bool 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
- * OCTETS_PER_BYTE (abfd, input_section));
- 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 */
- 0x00ffffff, /* 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. This kind of relocation is
- schizophrenic - Although they appear in sections named .rela.debug.*
- in some sections they behave as RELA relocs, but in others they have
- an added of zero and behave as REL.
- It is not recommended that new code emits this reloc. It is here
- only to support existing elf files generated by third party
- applications. */
- HOWTO (R_S12Z_CW32, /* 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_CW32", /* name */
- false, /* partial_inplace */
- 0xffffffff, /* src_mask */
- 0xffffffff, /* 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},
- {BFD_RELOC_S12Z_OPR, R_S12Z_OPR}
- };
- 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 bool
- 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 bool
- 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
- #include "elf32-target.h"
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