| /* ARC-specific support for 32-bit ELF |
| Copyright 1994, 1995, 1997, 1999, 2001, 2002, 2005, 2007 |
| Free Software Foundation, Inc. |
| Contributed by Doug Evans (dje@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 "libbfd.h" |
| #include "elf-bfd.h" |
| #include "elf/arc.h" |
| #include "libiberty.h" |
| |
| /* Try to minimize the amount of space occupied by relocation tables |
| on the ROM (not that the ROM won't be swamped by other ELF overhead). */ |
| |
| #define USE_REL 1 |
| |
| static bfd_reloc_status_type |
| arc_elf_b22_pcrel (bfd * abfd, |
| arelent * reloc_entry, |
| asymbol * symbol, |
| void * data, |
| asection * input_section, |
| bfd * output_bfd, |
| char ** error_message) |
| { |
| /* If linking, back up the final symbol address by the address of the |
| reloc. This cannot be accomplished by setting the pcrel_offset |
| field to TRUE, as bfd_install_relocation will detect this and refuse |
| to install the offset in the first place, but bfd_perform_relocation |
| will still insist on removing it. */ |
| if (output_bfd == NULL) |
| reloc_entry->addend -= reloc_entry->address; |
| |
| /* Fall through to the default elf reloc handler. */ |
| return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data, |
| input_section, output_bfd, error_message); |
| } |
| |
| static reloc_howto_type elf_arc_howto_table[] = |
| { |
| /* This reloc does nothing. */ |
| HOWTO (R_ARC_NONE, /* 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_ARC_NONE", /* Name. */ |
| TRUE, /* Partial_inplace. */ |
| 0, /* Src_mask. */ |
| 0, /* Dst_mask. */ |
| FALSE), /* PCrel_offset. */ |
| |
| /* A standard 32 bit relocation. */ |
| HOWTO (R_ARC_32, /* 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_ARC_32", /* Name. */ |
| TRUE, /* Partial_inplace. */ |
| 0xffffffff, /* Src_mask. */ |
| 0xffffffff, /* Dst_mask. */ |
| FALSE), /* PCrel_offset. */ |
| |
| /* A 26 bit absolute branch, right shifted by 2. */ |
| HOWTO (R_ARC_B26, /* Type. */ |
| 2, /* Rightshift. */ |
| 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 26, /* Bitsize. */ |
| FALSE, /* PC_relative. */ |
| 0, /* Bitpos. */ |
| complain_overflow_bitfield, /* Complain_on_overflow. */ |
| bfd_elf_generic_reloc, /* Special_function. */ |
| "R_ARC_B26", /* Name. */ |
| TRUE, /* Partial_inplace. */ |
| 0x00ffffff, /* Src_mask. */ |
| 0x00ffffff, /* Dst_mask. */ |
| FALSE), /* PCrel_offset. */ |
| |
| /* A relative 22 bit branch; bits 21-2 are stored in bits 26-7. */ |
| HOWTO (R_ARC_B22_PCREL, /* Type. */ |
| 2, /* Rightshift. */ |
| 2, /* Size (0 = byte, 1 = short, 2 = long). */ |
| 22, /* Bitsize. */ |
| TRUE, /* PC_relative. */ |
| 7, /* Bitpos. */ |
| complain_overflow_signed, /* Complain_on_overflow. */ |
| arc_elf_b22_pcrel, /* Special_function. */ |
| "R_ARC_B22_PCREL", /* Name. */ |
| TRUE, /* Partial_inplace. */ |
| 0x07ffff80, /* Src_mask. */ |
| 0x07ffff80, /* Dst_mask. */ |
| FALSE), /* PCrel_offset. */ |
| }; |
| |
| /* Map BFD reloc types to ARC ELF reloc types. */ |
| |
| struct arc_reloc_map |
| { |
| bfd_reloc_code_real_type bfd_reloc_val; |
| unsigned char elf_reloc_val; |
| }; |
| |
| static const struct arc_reloc_map arc_reloc_map[] = |
| { |
| { BFD_RELOC_NONE, R_ARC_NONE, }, |
| { BFD_RELOC_32, R_ARC_32 }, |
| { BFD_RELOC_CTOR, R_ARC_32 }, |
| { BFD_RELOC_ARC_B26, R_ARC_B26 }, |
| { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL }, |
| }; |
| |
| 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 = ARRAY_SIZE (arc_reloc_map); i--;) |
| if (arc_reloc_map[i].bfd_reloc_val == code) |
| return elf_arc_howto_table + arc_reloc_map[i].elf_reloc_val; |
| |
| 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_arc_howto_table) / sizeof (elf_arc_howto_table[0]); |
| i++) |
| if (elf_arc_howto_table[i].name != NULL |
| && strcasecmp (elf_arc_howto_table[i].name, r_name) == 0) |
| return &elf_arc_howto_table[i]; |
| |
| return NULL; |
| } |
| |
| /* Set the howto pointer for an ARC ELF reloc. */ |
| |
| static void |
| arc_info_to_howto_rel (bfd *abfd ATTRIBUTE_UNUSED, |
| arelent *cache_ptr, |
| Elf_Internal_Rela *dst) |
| { |
| unsigned int r_type; |
| |
| r_type = ELF32_R_TYPE (dst->r_info); |
| BFD_ASSERT (r_type < (unsigned int) R_ARC_max); |
| cache_ptr->howto = &elf_arc_howto_table[r_type]; |
| } |
| |
| /* Set the right machine number for an ARC ELF file. */ |
| |
| static bfd_boolean |
| arc_elf_object_p (bfd *abfd) |
| { |
| unsigned int mach = bfd_mach_arc_6; |
| |
| if (elf_elfheader(abfd)->e_machine == EM_ARC) |
| { |
| unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH; |
| |
| switch (arch) |
| { |
| case E_ARC_MACH_ARC5: |
| mach = bfd_mach_arc_5; |
| break; |
| default: |
| case E_ARC_MACH_ARC6: |
| mach = bfd_mach_arc_6; |
| break; |
| case E_ARC_MACH_ARC7: |
| mach = bfd_mach_arc_7; |
| break; |
| case E_ARC_MACH_ARC8: |
| mach = bfd_mach_arc_8; |
| break; |
| } |
| } |
| return bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach); |
| } |
| |
| /* The final processing done just before writing out an ARC ELF object file. |
| This gets the ARC architecture right based on the machine number. */ |
| |
| static void |
| arc_elf_final_write_processing (bfd *abfd, |
| bfd_boolean linker ATTRIBUTE_UNUSED) |
| { |
| unsigned long val; |
| |
| switch (bfd_get_mach (abfd)) |
| { |
| case bfd_mach_arc_5: |
| val = E_ARC_MACH_ARC5; |
| break; |
| default: |
| case bfd_mach_arc_6: |
| val = E_ARC_MACH_ARC6; |
| break; |
| case bfd_mach_arc_7: |
| val = E_ARC_MACH_ARC7; |
| break; |
| case bfd_mach_arc_8: |
| val = E_ARC_MACH_ARC8; |
| break; |
| } |
| elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH; |
| elf_elfheader (abfd)->e_flags |= val; |
| } |
| |
| #define TARGET_LITTLE_SYM bfd_elf32_littlearc_vec |
| #define TARGET_LITTLE_NAME "elf32-littlearc" |
| #define TARGET_BIG_SYM bfd_elf32_bigarc_vec |
| #define TARGET_BIG_NAME "elf32-bigarc" |
| #define ELF_ARCH bfd_arch_arc |
| #define ELF_MACHINE_CODE EM_ARC |
| #define ELF_MAXPAGESIZE 0x1000 |
| |
| #define elf_info_to_howto 0 |
| #define elf_info_to_howto_rel arc_info_to_howto_rel |
| #define elf_backend_object_p arc_elf_object_p |
| #define elf_backend_final_write_processing arc_elf_final_write_processing |
| |
| #include "elf32-target.h" |