/* ARC-specific support for 32-bit ELF Copyright (C) 1994, 1995 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 2 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., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include "bfd.h" #include "sysdep.h" #include "libbfd.h" #include "libelf.h" #include "elf/arc.h" static bfd_reloc_status_type arc_elf_unsupported_reloc PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **)); static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup PARAMS ((bfd *abfd, bfd_reloc_code_real_type code)); static void arc_info_to_howto_rel PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *)); static boolean arc_elf_object_p PARAMS ((bfd *)); static void arc_elf_final_write_processing PARAMS ((bfd *, boolean)); /* Try to minimize the amount of space occupied by relocation tables on the ROM. */ #define USE_REL enum reloc_type { R_ARC_NONE = 0, R_ARC_ADDR32, R_ARC_B22_PCREL, R_ARC_max }; 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 */ false, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ false), /* pcrel_offset */ /* A standard 32 bit relocation. */ HOWTO (R_ARC_ADDR32, /* 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_ADDR32", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0xffffffff, /* dst_mask */ false), /* pcrel_offset */ /* A relative 22 bit branch; the lower two bits must be zero. */ 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 */ bfd_elf_generic_reloc, /* special_function */ "R_ARC_B22_PCREL", /* name */ false, /* partial_inplace */ 0, /* src_mask */ 0x07ffff80, /* dst_mask */ true), /* pcrel_offset */ }; /* Don't pretend we can deal with unsupported relocs. */ static bfd_reloc_status_type arc_elf_unsupported_reloc (abfd, reloc_entry, symbol, data, input_section, output_bfd, error_message) bfd *abfd; arelent *reloc_entry; asymbol *symbol; PTR data; asection *input_section; bfd *output_bfd; char **error_message; { abort (); } /* Map BFD reloc types to ARC ELF reloc types. */ struct arc_reloc_map { unsigned char 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_ADDR32 }, { BFD_RELOC_CTOR, R_ARC_ADDR32 }, { BFD_RELOC_ARC_B22_PCREL, R_ARC_B22_PCREL }, }; static reloc_howto_type * bfd_elf32_bfd_reloc_type_lookup (abfd, code) bfd *abfd; bfd_reloc_code_real_type code; { int i; for (i = 0; i < sizeof (arc_reloc_map) / sizeof (struct 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; } /* Set the howto pointer for an ARC ELF reloc. */ static void arc_info_to_howto_rel (abfd, cache_ptr, dst) bfd *abfd; arelent *cache_ptr; Elf32_Internal_Rel *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 boolean arc_elf_object_p (abfd) bfd *abfd; { int mach; unsigned long arch = elf_elfheader (abfd)->e_flags & EF_ARC_MACH; switch (arch) { case E_ARC_MACH_BASE: mach = bfd_mach_arc_base; break; case E_ARC_MACH_HOST: mach = bfd_mach_arc_host; break; case E_ARC_MACH_GRAPHICS: mach = bfd_mach_arc_graphics; break; case E_ARC_MACH_AUDIO: mach = bfd_mach_arc_audio; break; default: /* Unknown cpu type. ??? What to do? */ return false; } (void) bfd_default_set_arch_mach (abfd, bfd_arch_arc, mach); return true; } /* 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 (abfd, linker) bfd *abfd; boolean linker; { int mach; unsigned long val; switch (mach = bfd_get_mach (abfd)) { case bfd_mach_arc_base: val = E_ARC_MACH_BASE; break; case bfd_mach_arc_host: val = E_ARC_MACH_HOST; break; case bfd_mach_arc_graphics: val = E_ARC_MACH_GRAPHICS; break; case bfd_mach_arc_audio: val = E_ARC_MACH_AUDIO; break; default: return; } elf_elfheader (abfd)->e_flags &=~ EF_ARC_MACH; elf_elfheader (abfd)->e_flags |= val; } #define TARGET_LITTLE_SYM bfd_elf32_arc_vec #define TARGET_LITTLE_NAME "elf32-arc" #define ELF_ARCH bfd_arch_arc #define ELF_MACHINE_CODE EM_CYGNUS_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"