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/* MIPS-specific support for 32-bit ELF Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2007 Free Software Foundation, Inc. Most of the information added by Ian Lance Taylor, Cygnus Support, <ian@cygnus.com>. N32/64 ABI support added by Mark Mitchell, CodeSourcery, LLC. <mark@codesourcery.com> Traditional MIPS targets support added by Koundinya.K, Dansk Data Elektronik & Operations Research Group. <kk@ddeorg.soft.net> 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. */ /* This file handles MIPS ELF targets. SGI Irix 5 uses a slightly different MIPS ELF from other targets. This matters when linking. This file supports both, switching at runtime. */ #include "sysdep.h" #include "bfd.h" #include "libbfd.h" #include "bfdlink.h" #include "genlink.h" #include "elf-bfd.h" #include "elfxx-mips.h" #include "elf/mips.h" #include "elf-vxworks.h" /* Get the ECOFF swapping routines. */ #include "coff/sym.h" #include "coff/symconst.h" #include "coff/internal.h" #include "coff/ecoff.h" #include "coff/mips.h" #define ECOFF_SIGNED_32 #include "ecoffswap.h" static bfd_reloc_status_type gprel32_with_gp (bfd *, asymbol *, arelent *, asection *, bfd_boolean, void *, bfd_vma); static bfd_reloc_status_type mips_elf_gprel32_reloc (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); static bfd_reloc_status_type mips32_64bit_reloc (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup (bfd *, bfd_reloc_code_real_type); static reloc_howto_type *mips_elf32_rtype_to_howto (unsigned int, bfd_boolean); static void mips_info_to_howto_rel (bfd *, arelent *, Elf_Internal_Rela *); static void mips_info_to_howto_rela (bfd *, arelent *, Elf_Internal_Rela *); static bfd_boolean mips_elf_sym_is_global (bfd *, asymbol *); static bfd_boolean mips_elf32_object_p (bfd *); static bfd_boolean mips_elf_is_local_label_name (bfd *, const char *); static bfd_reloc_status_type mips16_gprel_reloc (bfd *, arelent *, asymbol *, void *, asection *, bfd *, char **); static bfd_reloc_status_type mips_elf_final_gp (bfd *, asymbol *, bfd_boolean, char **, bfd_vma *); static bfd_boolean mips_elf_assign_gp (bfd *, bfd_vma *); static bfd_boolean elf32_mips_grok_prstatus (bfd *, Elf_Internal_Note *); static bfd_boolean elf32_mips_grok_psinfo (bfd *, Elf_Internal_Note *); static irix_compat_t elf32_mips_irix_compat (bfd *); extern const bfd_target bfd_elf32_bigmips_vec; extern const bfd_target bfd_elf32_littlemips_vec; /* Nonzero if ABFD is using the N32 ABI. */ #define ABI_N32_P(abfd) \ ((elf_elfheader (abfd)->e_flags & EF_MIPS_ABI2) != 0) /* Whether we are trying to be compatible with IRIX at all. */ #define SGI_COMPAT(abfd) \ (elf32_mips_irix_compat (abfd) != ict_none) /* The number of local .got entries we reserve. */ #define MIPS_RESERVED_GOTNO (2) /* In case we're on a 32-bit machine, construct a 64-bit "-1" value from smaller values. Start with zero, widen, *then* decrement. */ #define MINUS_ONE (((bfd_vma)0) - 1) /* The relocation table used for SHT_REL sections. */ static reloc_howto_type elf_mips_howto_table_rel[] = { /* No relocation. */ HOWTO (R_MIPS_NONE, /* type */ 0, /* rightshift */ 0, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_NONE", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE), /* pcrel_offset */ /* 16 bit relocation. */ HOWTO (R_MIPS_16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* 32 bit relocation. */ HOWTO (R_MIPS_32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_32", /* name */ TRUE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* 32 bit symbol relative relocation. */ HOWTO (R_MIPS_REL32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_REL32", /* name */ TRUE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* 26 bit jump address. */ HOWTO (R_MIPS_26, /* type */ 2, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 26, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ /* This needs complex overflow detection, because the upper four bits must match the PC + 4. */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_26", /* name */ TRUE, /* partial_inplace */ 0x03ffffff, /* src_mask */ 0x03ffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* High 16 bits of symbol value. */ HOWTO (R_MIPS_HI16, /* type */ 16, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_hi16_reloc, /* special_function */ "R_MIPS_HI16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* Low 16 bits of symbol value. */ HOWTO (R_MIPS_LO16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_lo16_reloc, /* special_function */ "R_MIPS_LO16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* GP relative reference. */ HOWTO (R_MIPS_GPREL16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf32_gprel16_reloc, /* special_function */ "R_MIPS_GPREL16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* Reference to literal section. */ HOWTO (R_MIPS_LITERAL, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf32_gprel16_reloc, /* special_function */ "R_MIPS_LITERAL", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* Reference to global offset table. */ HOWTO (R_MIPS_GOT16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_got16_reloc, /* special_function */ "R_MIPS_GOT16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* 16 bit PC relative reference. Note that the ABI document has a typo and claims R_MIPS_PC16 to be not rightshifted, rendering it useless. We do the right thing here. */ HOWTO (R_MIPS_PC16, /* type */ 2, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_PC16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ TRUE), /* pcrel_offset */ /* 16 bit call through global offset table. */ HOWTO (R_MIPS_CALL16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_CALL16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* 32 bit GP relative reference. */ HOWTO (R_MIPS_GPREL32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ mips_elf_gprel32_reloc, /* special_function */ "R_MIPS_GPREL32", /* name */ TRUE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* The remaining relocs are defined on Irix 5, although they are not defined by the ABI. */ EMPTY_HOWTO (13), EMPTY_HOWTO (14), EMPTY_HOWTO (15), /* A 5 bit shift field. */ HOWTO (R_MIPS_SHIFT5, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 5, /* bitsize */ FALSE, /* pc_relative */ 6, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_SHIFT5", /* name */ TRUE, /* partial_inplace */ 0x000007c0, /* src_mask */ 0x000007c0, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 6 bit shift field. */ /* FIXME: This is not handled correctly; a special function is needed to put the most significant bit in the right place. */ HOWTO (R_MIPS_SHIFT6, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 6, /* bitsize */ FALSE, /* pc_relative */ 6, /* bitpos */ complain_overflow_bitfield, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_SHIFT6", /* name */ TRUE, /* partial_inplace */ 0x000007c4, /* src_mask */ 0x000007c4, /* dst_mask */ FALSE), /* pcrel_offset */ /* A 64 bit relocation. */ HOWTO (R_MIPS_64, /* type */ 0, /* rightshift */ 4, /* size (0 = byte, 1 = short, 2 = long) */ 64, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ mips32_64bit_reloc, /* special_function */ "R_MIPS_64", /* name */ TRUE, /* partial_inplace */ MINUS_ONE, /* src_mask */ MINUS_ONE, /* dst_mask */ FALSE), /* pcrel_offset */ /* Displacement in the global offset table. */ HOWTO (R_MIPS_GOT_DISP, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_GOT_DISP", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* Displacement to page pointer in the global offset table. */ HOWTO (R_MIPS_GOT_PAGE, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_GOT_PAGE", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* Offset from page pointer in the global offset table. */ HOWTO (R_MIPS_GOT_OFST, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_GOT_OFST", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* High 16 bits of displacement in global offset table. */ HOWTO (R_MIPS_GOT_HI16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_GOT_HI16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* Low 16 bits of displacement in global offset table. */ HOWTO (R_MIPS_GOT_LO16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_GOT_LO16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* 64 bit subtraction. Used in the N32 ABI. */ HOWTO (R_MIPS_SUB, /* type */ 0, /* rightshift */ 4, /* size (0 = byte, 1 = short, 2 = long) */ 64, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_SUB", /* name */ TRUE, /* partial_inplace */ MINUS_ONE, /* src_mask */ MINUS_ONE, /* dst_mask */ FALSE), /* pcrel_offset */ /* Used to cause the linker to insert and delete instructions? */ EMPTY_HOWTO (R_MIPS_INSERT_A), EMPTY_HOWTO (R_MIPS_INSERT_B), EMPTY_HOWTO (R_MIPS_DELETE), /* Get the higher value of a 64 bit addend. */ HOWTO (R_MIPS_HIGHER, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_HIGHER", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* Get the highest value of a 64 bit addend. */ HOWTO (R_MIPS_HIGHEST, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_HIGHEST", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* High 16 bits of displacement in global offset table. */ HOWTO (R_MIPS_CALL_HI16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_CALL_HI16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* Low 16 bits of displacement in global offset table. */ HOWTO (R_MIPS_CALL_LO16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_CALL_LO16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* Section displacement. */ HOWTO (R_MIPS_SCN_DISP, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_SCN_DISP", /* name */ TRUE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ EMPTY_HOWTO (R_MIPS_REL16), EMPTY_HOWTO (R_MIPS_ADD_IMMEDIATE), EMPTY_HOWTO (R_MIPS_PJUMP), EMPTY_HOWTO (R_MIPS_RELGOT), /* Protected jump conversion. This is an optimization hint. No relocation is required for correctness. */ HOWTO (R_MIPS_JALR, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_JALR", /* name */ FALSE, /* partial_inplace */ 0x00000000, /* src_mask */ 0x00000000, /* dst_mask */ FALSE), /* pcrel_offset */ /* TLS GD/LD dynamic relocations. */ HOWTO (R_MIPS_TLS_DTPMOD32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_TLS_DTPMOD32", /* name */ TRUE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ HOWTO (R_MIPS_TLS_DTPREL32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_TLS_DTPREL32", /* name */ TRUE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ EMPTY_HOWTO (R_MIPS_TLS_DTPMOD64), EMPTY_HOWTO (R_MIPS_TLS_DTPREL64), /* TLS general dynamic variable reference. */ HOWTO (R_MIPS_TLS_GD, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_TLS_GD", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* TLS local dynamic variable reference. */ HOWTO (R_MIPS_TLS_LDM, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_TLS_LDM", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* TLS local dynamic offset. */ HOWTO (R_MIPS_TLS_DTPREL_HI16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_TLS_DTPREL_HI16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* TLS local dynamic offset. */ HOWTO (R_MIPS_TLS_DTPREL_LO16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_TLS_DTPREL_LO16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* TLS thread pointer offset. */ HOWTO (R_MIPS_TLS_GOTTPREL, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_TLS_GOTTPREL", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* TLS IE dynamic relocations. */ HOWTO (R_MIPS_TLS_TPREL32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_TLS_TPREL32", /* name */ TRUE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ EMPTY_HOWTO (R_MIPS_TLS_TPREL64), /* TLS thread pointer offset. */ HOWTO (R_MIPS_TLS_TPREL_HI16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_TLS_TPREL_HI16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* TLS thread pointer offset. */ HOWTO (R_MIPS_TLS_TPREL_LO16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_TLS_TPREL_LO16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* 32 bit relocation with no addend. */ HOWTO (R_MIPS_GLOB_DAT, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_GLOB_DAT", /* name */ FALSE, /* partial_inplace */ 0x0, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE), /* pcrel_offset */ }; /* The reloc used for BFD_RELOC_CTOR when doing a 64 bit link. This is a hack to make the linker think that we need 64 bit values. */ static reloc_howto_type elf_mips_ctor64_howto = HOWTO (R_MIPS_64, /* type */ 0, /* rightshift */ 4, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ mips32_64bit_reloc, /* special_function */ "R_MIPS_64", /* name */ TRUE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ FALSE); /* pcrel_offset */ static reloc_howto_type elf_mips16_howto_table_rel[] = { /* The reloc used for the mips16 jump instruction. */ HOWTO (R_MIPS16_26, /* type */ 2, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 26, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ /* This needs complex overflow detection, because the upper four bits must match the PC. */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS16_26", /* name */ TRUE, /* partial_inplace */ 0x3ffffff, /* src_mask */ 0x3ffffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* The reloc used for the mips16 gprel instruction. */ HOWTO (R_MIPS16_GPREL, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ mips16_gprel_reloc, /* special_function */ "R_MIPS16_GPREL", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* A placeholder for MIPS16 reference to global offset table. */ EMPTY_HOWTO (R_MIPS16_GOT16), /* A placeholder for MIPS16 16 bit call through global offset table. */ EMPTY_HOWTO (R_MIPS16_CALL16), /* MIPS16 high 16 bits of symbol value. */ HOWTO (R_MIPS16_HI16, /* type */ 16, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_hi16_reloc, /* special_function */ "R_MIPS16_HI16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ /* MIPS16 low 16 bits of symbol value. */ HOWTO (R_MIPS16_LO16, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_mips_elf_lo16_reloc, /* special_function */ "R_MIPS16_LO16", /* name */ TRUE, /* partial_inplace */ 0x0000ffff, /* src_mask */ 0x0000ffff, /* dst_mask */ FALSE), /* pcrel_offset */ }; /* 16 bit offset for pc-relative branches. */ static reloc_howto_type elf_mips_gnu_rel16_s2 = HOWTO (R_MIPS_GNU_REL16_S2, /* type */ 2, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 16, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_GNU_REL16_S2", /* name */ TRUE, /* partial_inplace */ 0xffff, /* src_mask */ 0xffff, /* dst_mask */ TRUE); /* pcrel_offset */ /* 32 bit pc-relative. This was a GNU extension used by embedded-PIC. It was co-opted by mips-linux for exception-handling data. It is no longer used, but should continue to be supported by the linker for backward compatibility. (GCC stopped using it in May, 2004.) */ static reloc_howto_type elf_mips_gnu_pcrel32 = HOWTO (R_MIPS_PC32, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 32, /* bitsize */ TRUE, /* pc_relative */ 0, /* bitpos */ complain_overflow_signed, /* complain_on_overflow */ _bfd_mips_elf_generic_reloc, /* special_function */ "R_MIPS_PC32", /* name */ TRUE, /* partial_inplace */ 0xffffffff, /* src_mask */ 0xffffffff, /* dst_mask */ TRUE); /* pcrel_offset */ /* GNU extension to record C++ vtable hierarchy */ static reloc_howto_type elf_mips_gnu_vtinherit_howto = HOWTO (R_MIPS_GNU_VTINHERIT, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ NULL, /* special_function */ "R_MIPS_GNU_VTINHERIT", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE); /* pcrel_offset */ /* GNU extension to record C++ vtable member usage */ static reloc_howto_type elf_mips_gnu_vtentry_howto = HOWTO (R_MIPS_GNU_VTENTRY, /* type */ 0, /* rightshift */ 2, /* size (0 = byte, 1 = short, 2 = long) */ 0, /* bitsize */ FALSE, /* pc_relative */ 0, /* bitpos */ complain_overflow_dont, /* complain_on_overflow */ _bfd_elf_rel_vtable_reloc_fn, /* special_function */ "R_MIPS_GNU_VTENTRY", /* name */ FALSE, /* partial_inplace */ 0, /* src_mask */ 0, /* dst_mask */ FALSE); /* pcrel_offset */ /* Set the GP value for OUTPUT_BFD. Returns FALSE if this is a dangerous relocation. */ static bfd_boolean mips_elf_assign_gp (bfd *output_bfd, bfd_vma *pgp) { unsigned int count; asymbol **sym; unsigned int i; /* If we've already figured out what GP will be, just return it. */ *pgp = _bfd_get_gp_value (output_bfd); if (*pgp) return TRUE; count = bfd_get_symcount (output_bfd); sym = bfd_get_outsymbols (output_bfd); /* The linker script will have created a symbol named `_gp' with the appropriate value. */ if (sym == NULL) i = count; else { for (i = 0; i < count; i++, sym++) { register const char *name; name = bfd_asymbol_name (*sym); if (*name == '_' && strcmp (name, "_gp") == 0) { *pgp = bfd_asymbol_value (*sym); _bfd_set_gp_value (output_bfd, *pgp); break; } } } if (i >= count) { /* Only get the error once. */ *pgp = 4; _bfd_set_gp_value (output_bfd, *pgp); return FALSE; } return TRUE; } /* We have to figure out the gp value, so that we can adjust the symbol value correctly. We look up the symbol _gp in the output BFD. If we can't find it, we're stuck. We cache it in the ELF target data. We don't need to adjust the symbol value for an external symbol if we are producing relocatable output. */ static bfd_reloc_status_type mips_elf_final_gp (bfd *output_bfd, asymbol *symbol, bfd_boolean relocatable, char **error_message, bfd_vma *pgp) { if (bfd_is_und_section (symbol->section) && ! relocatable) { *pgp = 0; return bfd_reloc_undefined; } *pgp = _bfd_get_gp_value (output_bfd); if (*pgp == 0 && (! relocatable || (symbol->flags & BSF_SECTION_SYM) != 0)) { if (relocatable) { /* Make up a value. */ *pgp = symbol->section->output_section->vma + 0x4000; _bfd_set_gp_value (output_bfd, *pgp); } else if (!mips_elf_assign_gp (output_bfd, pgp)) { *error_message = (char *) _("GP relative relocation when _gp not defined"); return bfd_reloc_dangerous; } } return bfd_reloc_ok; } /* Do a R_MIPS_GPREL16 relocation. This is a 16 bit value which must become the offset from the gp register. This function also handles R_MIPS_LITERAL relocations, although those can be handled more cleverly because the entries in the .lit8 and .lit4 sections can be merged. */ bfd_reloc_status_type _bfd_mips_elf32_gprel16_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, void *data, asection *input_section, bfd *output_bfd, char **error_message) { bfd_boolean relocatable; bfd_reloc_status_type ret; bfd_vma gp; /* R_MIPS_LITERAL relocations are defined for local symbols only. */ if (reloc_entry->howto->type == R_MIPS_LITERAL && output_bfd != NULL && (symbol->flags & BSF_SECTION_SYM) == 0 && (symbol->flags & BSF_LOCAL) != 0) { *error_message = (char *) _("literal relocation occurs for an external symbol"); return bfd_reloc_outofrange; } if (output_bfd != NULL) relocatable = TRUE; else { relocatable = FALSE; output_bfd = symbol->section->output_section->owner; } ret = mips_elf_final_gp (output_bfd, symbol, relocatable, error_message, &gp); if (ret != bfd_reloc_ok) return ret; return _bfd_mips_elf_gprel16_with_gp (abfd, symbol, reloc_entry, input_section, relocatable, data, gp); } /* Do a R_MIPS_GPREL32 relocation. This is a 32 bit value which must become the offset from the gp register. */ static bfd_reloc_status_type mips_elf_gprel32_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, void *data, asection *input_section, bfd *output_bfd, char **error_message) { bfd_boolean relocatable; bfd_reloc_status_type ret; bfd_vma gp; /* R_MIPS_GPREL32 relocations are defined for local symbols only. */ if (output_bfd != NULL && (symbol->flags & BSF_SECTION_SYM) == 0 && (symbol->flags & BSF_LOCAL) != 0) { *error_message = (char *) _("32bits gp relative relocation occurs for an external symbol"); return bfd_reloc_outofrange; } if (output_bfd != NULL) relocatable = TRUE; else { relocatable = FALSE; output_bfd = symbol->section->output_section->owner; } ret = mips_elf_final_gp (output_bfd, symbol, relocatable, error_message, &gp); if (ret != bfd_reloc_ok) return ret; return gprel32_with_gp (abfd, symbol, reloc_entry, input_section, relocatable, data, gp); } static bfd_reloc_status_type gprel32_with_gp (bfd *abfd, asymbol *symbol, arelent *reloc_entry, asection *input_section, bfd_boolean relocatable, void *data, bfd_vma gp) { bfd_vma relocation; bfd_vma val; if (bfd_is_com_section (symbol->section)) relocation = 0; else relocation = symbol->value; relocation += symbol->section->output_section->vma; relocation += symbol->section->output_offset; if (reloc_entry->address > bfd_get_section_limit (abfd, input_section)) return bfd_reloc_outofrange; /* Set val to the offset into the section or symbol. */ val = reloc_entry->addend; if (reloc_entry->howto->partial_inplace) val += bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address); /* Adjust val for the final section location and GP value. If we are producing relocatable output, we don't want to do this for an external symbol. */ if (! relocatable || (symbol->flags & BSF_SECTION_SYM) != 0) val += relocation - gp; if (reloc_entry->howto->partial_inplace) bfd_put_32 (abfd, val, (bfd_byte *) data + reloc_entry->address); else reloc_entry->addend = val; if (relocatable) reloc_entry->address += input_section->output_offset; return bfd_reloc_ok; } /* Handle a 64 bit reloc in a 32 bit MIPS ELF file. These are generated when addresses are 64 bits. The upper 32 bits are a simple sign extension. */ static bfd_reloc_status_type mips32_64bit_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol ATTRIBUTE_UNUSED, void *data, asection *input_section, bfd *output_bfd, char **error_message) { bfd_reloc_status_type r; arelent reloc32; unsigned long val; bfd_size_type addr; /* Do a normal 32 bit relocation on the lower 32 bits. */ reloc32 = *reloc_entry; if (bfd_big_endian (abfd)) reloc32.address += 4; reloc32.howto = &elf_mips_howto_table_rel[R_MIPS_32]; r = bfd_perform_relocation (abfd, &reloc32, data, input_section, output_bfd, error_message); /* Sign extend into the upper 32 bits. */ val = bfd_get_32 (abfd, (bfd_byte *) data + reloc32.address); if ((val & 0x80000000) != 0) val = 0xffffffff; else val = 0; addr = reloc_entry->address; if (bfd_little_endian (abfd)) addr += 4; bfd_put_32 (abfd, val, (bfd_byte *) data + addr); return r; } /* Handle a mips16 GP relative reloc. */ static bfd_reloc_status_type mips16_gprel_reloc (bfd *abfd, arelent *reloc_entry, asymbol *symbol, void *data, asection *input_section, bfd *output_bfd, char **error_message) { bfd_boolean relocatable; bfd_reloc_status_type ret; bfd_byte *location; bfd_vma gp; /* If we're relocating, and this is an external symbol, we don't want to change anything. */ if (output_bfd != NULL && (symbol->flags & BSF_SECTION_SYM) == 0 && (symbol->flags & BSF_LOCAL) != 0) { reloc_entry->address += input_section->output_offset; return bfd_reloc_ok; } if (output_bfd != NULL) relocatable = TRUE; else { relocatable = FALSE; output_bfd = symbol->section->output_section->owner; } ret = mips_elf_final_gp (output_bfd, symbol, relocatable, error_message, &gp); if (ret != bfd_reloc_ok) return ret; location = (bfd_byte *) data + reloc_entry->address; _bfd_mips16_elf_reloc_unshuffle (abfd, reloc_entry->howto->type, FALSE, location); ret = _bfd_mips_elf_gprel16_with_gp (abfd, symbol, reloc_entry, input_section, relocatable, data, gp); _bfd_mips16_elf_reloc_shuffle (abfd, reloc_entry->howto->type, !relocatable, location); return ret; } /* A mapping from BFD reloc types to MIPS ELF reloc types. */ struct elf_reloc_map { bfd_reloc_code_real_type bfd_val; enum elf_mips_reloc_type elf_val; }; static const struct elf_reloc_map mips_reloc_map[] = { { BFD_RELOC_NONE, R_MIPS_NONE }, { BFD_RELOC_16, R_MIPS_16 }, { BFD_RELOC_32, R_MIPS_32 }, /* There is no BFD reloc for R_MIPS_REL32. */ { BFD_RELOC_64, R_MIPS_64 }, { BFD_RELOC_MIPS_JMP, R_MIPS_26 }, { BFD_RELOC_HI16_S, R_MIPS_HI16 }, { BFD_RELOC_LO16, R_MIPS_LO16 }, { BFD_RELOC_GPREL16, R_MIPS_GPREL16 }, { BFD_RELOC_MIPS_LITERAL, R_MIPS_LITERAL }, { BFD_RELOC_MIPS_GOT16, R_MIPS_GOT16 }, { BFD_RELOC_16_PCREL_S2, R_MIPS_PC16 }, { BFD_RELOC_MIPS_CALL16, R_MIPS_CALL16 }, { BFD_RELOC_GPREL32, R_MIPS_GPREL32 }, { BFD_RELOC_MIPS_GOT_HI16, R_MIPS_GOT_HI16 }, { BFD_RELOC_MIPS_GOT_LO16, R_MIPS_GOT_LO16 }, { BFD_RELOC_MIPS_CALL_HI16, R_MIPS_CALL_HI16 }, { BFD_RELOC_MIPS_CALL_LO16, R_MIPS_CALL_LO16 }, { BFD_RELOC_MIPS_SUB, R_MIPS_SUB }, { BFD_RELOC_MIPS_GOT_PAGE, R_MIPS_GOT_PAGE }, { BFD_RELOC_MIPS_GOT_OFST, R_MIPS_GOT_OFST }, { BFD_RELOC_MIPS_GOT_DISP, R_MIPS_GOT_DISP }, { BFD_RELOC_MIPS_TLS_DTPMOD32, R_MIPS_TLS_DTPMOD32 }, { BFD_RELOC_MIPS_TLS_DTPREL32, R_MIPS_TLS_DTPREL32 }, { BFD_RELOC_MIPS_TLS_DTPMOD64, R_MIPS_TLS_DTPMOD64 }, { BFD_RELOC_MIPS_TLS_DTPREL64, R_MIPS_TLS_DTPREL64 }, { BFD_RELOC_MIPS_TLS_GD, R_MIPS_TLS_GD }, { BFD_RELOC_MIPS_TLS_LDM, R_MIPS_TLS_LDM }, { BFD_RELOC_MIPS_TLS_DTPREL_HI16, R_MIPS_TLS_DTPREL_HI16 }, { BFD_RELOC_MIPS_TLS_DTPREL_LO16, R_MIPS_TLS_DTPREL_LO16 }, { BFD_RELOC_MIPS_TLS_GOTTPREL, R_MIPS_TLS_GOTTPREL }, { BFD_RELOC_MIPS_TLS_TPREL32, R_MIPS_TLS_TPREL32 }, { BFD_RELOC_MIPS_TLS_TPREL64, R_MIPS_TLS_TPREL64 }, { BFD_RELOC_MIPS_TLS_TPREL_HI16, R_MIPS_TLS_TPREL_HI16 }, { BFD_RELOC_MIPS_TLS_TPREL_LO16, R_MIPS_TLS_TPREL_LO16 } }; static const struct elf_reloc_map mips16_reloc_map[] = { { BFD_RELOC_MIPS16_JMP, R_MIPS16_26 - R_MIPS16_min }, { BFD_RELOC_MIPS16_GPREL, R_MIPS16_GPREL - R_MIPS16_min }, { BFD_RELOC_MIPS16_HI16_S, R_MIPS16_HI16 - R_MIPS16_min }, { BFD_RELOC_MIPS16_LO16, R_MIPS16_LO16 - R_MIPS16_min }, }; /* Given a BFD reloc type, return a howto structure. */ static reloc_howto_type * bfd_elf32_bfd_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code) { unsigned int i; reloc_howto_type *howto_table = elf_mips_howto_table_rel; reloc_howto_type *howto16_table = elf_mips16_howto_table_rel; for (i = 0; i < sizeof (mips_reloc_map) / sizeof (struct elf_reloc_map); i++) { if (mips_reloc_map[i].bfd_val == code) return &howto_table[(int) mips_reloc_map[i].elf_val]; } for (i = 0; i < sizeof (mips16_reloc_map) / sizeof (struct elf_reloc_map); i++) { if (mips16_reloc_map[i].bfd_val == code) return &howto16_table[(int) mips16_reloc_map[i].elf_val]; } switch (code) { default: bfd_set_error (bfd_error_bad_value); return NULL; case BFD_RELOC_CTOR: /* We need to handle BFD_RELOC_CTOR specially. Select the right relocation (R_MIPS_32 or R_MIPS_64) based on the size of addresses of the ABI. */ if ((elf_elfheader (abfd)->e_flags & (E_MIPS_ABI_O64 | E_MIPS_ABI_EABI64)) != 0) return &elf_mips_ctor64_howto; else return &howto_table[(int) R_MIPS_32]; case BFD_RELOC_VTABLE_INHERIT: return &elf_mips_gnu_vtinherit_howto; case BFD_RELOC_VTABLE_ENTRY: return &elf_mips_gnu_vtentry_howto; case BFD_RELOC_32_PCREL: return &elf_mips_gnu_pcrel32; } } 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_mips_howto_table_rel) / sizeof (elf_mips_howto_table_rel[0])); i++) if (elf_mips_howto_table_rel[i].name != NULL && strcasecmp (elf_mips_howto_table_rel[i].name, r_name) == 0) return &elf_mips_howto_table_rel[i]; for (i = 0; i < (sizeof (elf_mips16_howto_table_rel) / sizeof (elf_mips16_howto_table_rel[0])); i++) if (elf_mips16_howto_table_rel[i].name != NULL && strcasecmp (elf_mips16_howto_table_rel[i].name, r_name) == 0) return &elf_mips16_howto_table_rel[i]; if (strcasecmp (elf_mips_gnu_pcrel32.name, r_name) == 0) return &elf_mips_gnu_pcrel32; if (strcasecmp (elf_mips_gnu_rel16_s2.name, r_name) == 0) return &elf_mips_gnu_rel16_s2; if (strcasecmp (elf_mips_gnu_vtinherit_howto.name, r_name) == 0) return &elf_mips_gnu_vtinherit_howto; if (strcasecmp (elf_mips_gnu_vtentry_howto.name, r_name) == 0) return &elf_mips_gnu_vtentry_howto; return NULL; } /* Given a MIPS Elf_Internal_Rel, fill in an arelent structure. */ static reloc_howto_type * mips_elf32_rtype_to_howto (unsigned int r_type, bfd_boolean rela_p ATTRIBUTE_UNUSED) { switch (r_type) { case R_MIPS_GNU_VTINHERIT: return &elf_mips_gnu_vtinherit_howto; case R_MIPS_GNU_VTENTRY: return &elf_mips_gnu_vtentry_howto; case R_MIPS_GNU_REL16_S2: return &elf_mips_gnu_rel16_s2; case R_MIPS_PC32: return &elf_mips_gnu_pcrel32; default: if (r_type >= R_MIPS16_min && r_type < R_MIPS16_max) return &elf_mips16_howto_table_rel[r_type - R_MIPS16_min]; BFD_ASSERT (r_type < (unsigned int) R_MIPS_max); return &elf_mips_howto_table_rel[r_type]; } } /* Given a MIPS Elf_Internal_Rel, fill in an arelent structure. */ static void mips_info_to_howto_rel (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst) { const struct elf_backend_data *bed; unsigned int r_type; r_type = ELF32_R_TYPE (dst->r_info); bed = get_elf_backend_data (abfd); cache_ptr->howto = bed->elf_backend_mips_rtype_to_howto (r_type, FALSE); /* The addend for a GPREL16 or LITERAL relocation comes from the GP value for the object file. We get the addend now, rather than when we do the relocation, because the symbol manipulations done by the linker may cause us to lose track of the input BFD. */ if (((*cache_ptr->sym_ptr_ptr)->flags & BSF_SECTION_SYM) != 0 && (r_type == (unsigned int) R_MIPS_GPREL16 || r_type == (unsigned int) R_MIPS_LITERAL)) cache_ptr->addend = elf_gp (abfd); } /* Given a MIPS Elf_Internal_Rela, fill in an arelent structure. */ static void mips_info_to_howto_rela (bfd *abfd, arelent *cache_ptr, Elf_Internal_Rela *dst) { mips_info_to_howto_rel (abfd, cache_ptr, dst); /* If we ever need to do any extra processing with dst->r_addend (the field omitted in an Elf_Internal_Rel) we can do it here. */ } /* Determine whether a symbol is global for the purposes of splitting the symbol table into global symbols and local symbols. At least on Irix 5, this split must be between section symbols and all other symbols. On most ELF targets the split is between static symbols and externally visible symbols. */ static bfd_boolean mips_elf_sym_is_global (bfd *abfd ATTRIBUTE_UNUSED, asymbol *sym) { if (SGI_COMPAT (abfd)) return (sym->flags & BSF_SECTION_SYM) == 0; else return ((sym->flags & (BSF_GLOBAL | BSF_WEAK)) != 0 || bfd_is_und_section (bfd_get_section (sym)) || bfd_is_com_section (bfd_get_section (sym))); } /* Set the right machine number for a MIPS ELF file. */ static bfd_boolean mips_elf32_object_p (bfd *abfd) { unsigned long mach; /* Irix 5 and 6 are broken. Object file symbol tables are not always sorted correctly such that local symbols precede global symbols, and the sh_info field in the symbol table is not always right. */ if (SGI_COMPAT (abfd)) elf_bad_symtab (abfd) = TRUE; if (ABI_N32_P (abfd)) return FALSE; mach = _bfd_elf_mips_mach (elf_elfheader (abfd)->e_flags); bfd_default_set_arch_mach (abfd, bfd_arch_mips, mach); return TRUE; } /* MIPS ELF local labels start with '$', not 'L'. */ static bfd_boolean mips_elf_is_local_label_name (bfd *abfd, const char *name) { if (name[0] == '$') return TRUE; /* On Irix 6, the labels go back to starting with '.', so we accept the generic ELF local label syntax as well. */ return _bfd_elf_is_local_label_name (abfd, name); } /* Support for core dump NOTE sections. */ static bfd_boolean elf32_mips_grok_prstatus (bfd *abfd, Elf_Internal_Note *note) { int offset; unsigned int size; switch (note->descsz) { default: return FALSE; case 256: /* Linux/MIPS */ /* pr_cursig */ elf_tdata (abfd)->core_signal = bfd_get_16 (abfd, note->descdata + 12); /* pr_pid */ elf_tdata (abfd)->core_pid = bfd_get_32 (abfd, note->descdata + 24); /* pr_reg */ offset = 72; size = 180; break; } /* Make a ".reg/999" section. */ return _bfd_elfcore_make_pseudosection (abfd, ".reg", size, note->descpos + offset); } static bfd_boolean elf32_mips_grok_psinfo (bfd *abfd, Elf_Internal_Note *note) { switch (note->descsz) { default: return FALSE; case 128: /* Linux/MIPS elf_prpsinfo */ elf_tdata (abfd)->core_program = _bfd_elfcore_strndup (abfd, note->descdata + 32, 16); elf_tdata (abfd)->core_command = _bfd_elfcore_strndup (abfd, note->descdata + 48, 80); } /* Note that for some reason, a spurious space is tacked onto the end of the args in some (at least one anyway) implementations, so strip it off if it exists. */ { char *command = elf_tdata (abfd)->core_command; int n = strlen (command); if (0 < n && command[n - 1] == ' ') command[n - 1] = '\0'; } return TRUE; } /* Depending on the target vector we generate some version of Irix executables or "normal" MIPS ELF ABI executables. */ static irix_compat_t elf32_mips_irix_compat (bfd *abfd) { if ((abfd->xvec == &bfd_elf32_bigmips_vec) || (abfd->xvec == &bfd_elf32_littlemips_vec)) return ict_irix5; else return ict_none; } /* ECOFF swapping routines. These are used when dealing with the .mdebug section, which is in the ECOFF debugging format. */ static const struct ecoff_debug_swap mips_elf32_ecoff_debug_swap = { /* Symbol table magic number. */ magicSym, /* Alignment of debugging information. E.g., 4. */ 4, /* Sizes of external symbolic information. */ sizeof (struct hdr_ext), sizeof (struct dnr_ext), sizeof (struct pdr_ext), sizeof (struct sym_ext), sizeof (struct opt_ext), sizeof (struct fdr_ext), sizeof (struct rfd_ext), sizeof (struct ext_ext), /* Functions to swap in external symbolic data. */ ecoff_swap_hdr_in, ecoff_swap_dnr_in, ecoff_swap_pdr_in, ecoff_swap_sym_in, ecoff_swap_opt_in, ecoff_swap_fdr_in, ecoff_swap_rfd_in, ecoff_swap_ext_in, _bfd_ecoff_swap_tir_in, _bfd_ecoff_swap_rndx_in, /* Functions to swap out external symbolic data. */ ecoff_swap_hdr_out, ecoff_swap_dnr_out, ecoff_swap_pdr_out, ecoff_swap_sym_out, ecoff_swap_opt_out, ecoff_swap_fdr_out, ecoff_swap_rfd_out, ecoff_swap_ext_out, _bfd_ecoff_swap_tir_out, _bfd_ecoff_swap_rndx_out, /* Function to read in symbolic data. */ _bfd_mips_elf_read_ecoff_info }; #define ELF_ARCH bfd_arch_mips #define ELF_MACHINE_CODE EM_MIPS #define elf_backend_collect TRUE #define elf_backend_type_change_ok TRUE #define elf_backend_can_gc_sections TRUE #define elf_info_to_howto mips_info_to_howto_rela #define elf_info_to_howto_rel mips_info_to_howto_rel #define elf_backend_sym_is_global mips_elf_sym_is_global #define elf_backend_object_p mips_elf32_object_p #define elf_backend_symbol_processing _bfd_mips_elf_symbol_processing #define elf_backend_section_processing _bfd_mips_elf_section_processing #define elf_backend_section_from_shdr _bfd_mips_elf_section_from_shdr #define elf_backend_fake_sections _bfd_mips_elf_fake_sections #define elf_backend_section_from_bfd_section \ _bfd_mips_elf_section_from_bfd_section #define elf_backend_add_symbol_hook _bfd_mips_elf_add_symbol_hook #define elf_backend_link_output_symbol_hook \ _bfd_mips_elf_link_output_symbol_hook #define elf_backend_create_dynamic_sections \ _bfd_mips_elf_create_dynamic_sections #define elf_backend_check_relocs _bfd_mips_elf_check_relocs #define elf_backend_merge_symbol_attribute \ _bfd_mips_elf_merge_symbol_attribute #define elf_backend_adjust_dynamic_symbol \ _bfd_mips_elf_adjust_dynamic_symbol #define elf_backend_always_size_sections \ _bfd_mips_elf_always_size_sections #define elf_backend_size_dynamic_sections \ _bfd_mips_elf_size_dynamic_sections #define elf_backend_init_index_section _bfd_elf_init_1_index_section #define elf_backend_relocate_section _bfd_mips_elf_relocate_section #define elf_backend_finish_dynamic_symbol \ _bfd_mips_elf_finish_dynamic_symbol #define elf_backend_finish_dynamic_sections \ _bfd_mips_elf_finish_dynamic_sections #define elf_backend_final_write_processing \ _bfd_mips_elf_final_write_processing #define elf_backend_additional_program_headers \ _bfd_mips_elf_additional_program_headers #define elf_backend_modify_segment_map _bfd_mips_elf_modify_segment_map #define elf_backend_gc_mark_hook _bfd_mips_elf_gc_mark_hook #define elf_backend_gc_sweep_hook _bfd_mips_elf_gc_sweep_hook #define elf_backend_copy_indirect_symbol \ _bfd_mips_elf_copy_indirect_symbol #define elf_backend_hide_symbol _bfd_mips_elf_hide_symbol #define elf_backend_grok_prstatus elf32_mips_grok_prstatus #define elf_backend_grok_psinfo elf32_mips_grok_psinfo #define elf_backend_ecoff_debug_swap &mips_elf32_ecoff_debug_swap #define elf_backend_got_header_size (4 * MIPS_RESERVED_GOTNO) #define elf_backend_may_use_rel_p 1 #define elf_backend_may_use_rela_p 0 #define elf_backend_default_use_rela_p 0 #define elf_backend_sign_extend_vma TRUE #define elf_backend_discard_info _bfd_mips_elf_discard_info #define elf_backend_ignore_discarded_relocs \ _bfd_mips_elf_ignore_discarded_relocs #define elf_backend_mips_irix_compat elf32_mips_irix_compat #define elf_backend_mips_rtype_to_howto mips_elf32_rtype_to_howto #define bfd_elf32_bfd_is_local_label_name \ mips_elf_is_local_label_name #define bfd_elf32_find_nearest_line _bfd_mips_elf_find_nearest_line #define bfd_elf32_find_inliner_info _bfd_mips_elf_find_inliner_info #define bfd_elf32_new_section_hook _bfd_mips_elf_new_section_hook #define bfd_elf32_set_section_contents _bfd_mips_elf_set_section_contents #define bfd_elf32_bfd_get_relocated_section_contents \ _bfd_elf_mips_get_relocated_section_contents #define bfd_elf32_bfd_link_hash_table_create \ _bfd_mips_elf_link_hash_table_create #define bfd_elf32_bfd_final_link _bfd_mips_elf_final_link #define bfd_elf32_bfd_merge_private_bfd_data \ _bfd_mips_elf_merge_private_bfd_data #define bfd_elf32_bfd_set_private_flags _bfd_mips_elf_set_private_flags #define bfd_elf32_bfd_print_private_bfd_data \ _bfd_mips_elf_print_private_bfd_data /* Support for SGI-ish mips targets. */ #define TARGET_LITTLE_SYM bfd_elf32_littlemips_vec #define TARGET_LITTLE_NAME "elf32-littlemips" #define TARGET_BIG_SYM bfd_elf32_bigmips_vec #define TARGET_BIG_NAME "elf32-bigmips" /* The SVR4 MIPS ABI says that this should be 0x10000, but Irix 5 uses a value of 0x1000, and we are compatible. */ #define ELF_MAXPAGESIZE 0x1000 #define ELF_COMMONPAGESIZE 0x1000 #include "elf32-target.h" /* Support for traditional mips targets. */ #undef TARGET_LITTLE_SYM #undef TARGET_LITTLE_NAME #undef TARGET_BIG_SYM #undef TARGET_BIG_NAME #undef ELF_MAXPAGESIZE #undef ELF_COMMONPAGESIZE #define TARGET_LITTLE_SYM bfd_elf32_tradlittlemips_vec #define TARGET_LITTLE_NAME "elf32-tradlittlemips" #define TARGET_BIG_SYM bfd_elf32_tradbigmips_vec #define TARGET_BIG_NAME "elf32-tradbigmips" /* The MIPS ABI says at Page 5-1: Virtual addresses and file offsets for MIPS segments are congruent modulo 64 KByte (0x10000) or larger powers of 2. Because 64 KBytes is the maximum page size, the files are suitable for paging regardless of physical page size. */ #define ELF_MAXPAGESIZE 0x10000 #define ELF_COMMONPAGESIZE 0x1000 #define elf32_bed elf32_tradbed /* Include the target file again for this target. */ #include "elf32-target.h" /* Specific to VxWorks. */ static reloc_howto_type mips_vxworks_copy_howto_rela = HOWTO (R_MIPS_COPY, /* 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_MIPS_COPY", /* name */ FALSE, /* partial_inplace */ 0x0, /* src_mask */ 0x0, /* dst_mask */ FALSE); /* pcrel_offset */ /* Specific to VxWorks. */ static reloc_howto_type mips_vxworks_jump_slot_howto_rela = HOWTO (R_MIPS_JUMP_SLOT, /* 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_MIPS_JUMP_SLOT", /* name */ FALSE, /* partial_inplace */ 0x0, /* src_mask */ 0x0, /* dst_mask */ FALSE); /* pcrel_offset */ /* Implement elf_backend_bfd_reloc_type_lookup for VxWorks. */ static reloc_howto_type * mips_vxworks_bfd_reloc_type_lookup (bfd *abfd, bfd_reloc_code_real_type code) { switch (code) { case BFD_RELOC_MIPS_COPY: return &mips_vxworks_copy_howto_rela; case BFD_RELOC_MIPS_JUMP_SLOT: return &mips_vxworks_jump_slot_howto_rela; default: return bfd_elf32_bfd_reloc_type_lookup (abfd, code); } } static reloc_howto_type * mips_vxworks_bfd_reloc_name_lookup (bfd *abfd, const char *r_name) { if (strcasecmp (mips_vxworks_copy_howto_rela.name, r_name) == 0) return &mips_vxworks_copy_howto_rela; if (strcasecmp (mips_vxworks_jump_slot_howto_rela.name, r_name) == 0) return &mips_vxworks_jump_slot_howto_rela; return bfd_elf32_bfd_reloc_name_lookup (abfd, r_name); } /* Implement elf_backend_mips_rtype_to_lookup for VxWorks. */ static reloc_howto_type * mips_vxworks_rtype_to_howto (unsigned int r_type, bfd_boolean rela_p) { switch (r_type) { case R_MIPS_COPY: return &mips_vxworks_copy_howto_rela; case R_MIPS_JUMP_SLOT: return &mips_vxworks_jump_slot_howto_rela; default: return mips_elf32_rtype_to_howto (r_type, rela_p); } } /* Implement elf_backend_final_write_processing for VxWorks. */ static void mips_vxworks_final_write_processing (bfd *abfd, bfd_boolean linker) { _bfd_mips_elf_final_write_processing (abfd, linker); elf_vxworks_final_write_processing (abfd, linker); } #undef TARGET_LITTLE_SYM #undef TARGET_LITTLE_NAME #undef TARGET_BIG_SYM #undef TARGET_BIG_NAME #undef ELF_MAXPAGESIZE #undef ELF_COMMONPAGESIZE #define TARGET_LITTLE_SYM bfd_elf32_littlemips_vxworks_vec #define TARGET_LITTLE_NAME "elf32-littlemips-vxworks" #define TARGET_BIG_SYM bfd_elf32_bigmips_vxworks_vec #define TARGET_BIG_NAME "elf32-bigmips-vxworks" #undef elf32_bed #define elf32_bed elf32_mips_vxworks_bed #define ELF_MAXPAGESIZE 0x1000 #define ELF_COMMONPAGESIZE 0x1000 #undef elf_backend_want_got_plt #define elf_backend_want_got_plt 1 #undef elf_backend_want_plt_sym #define elf_backend_want_plt_sym 1 #undef elf_backend_got_symbol_offset #define elf_backend_got_symbol_offset 0 #undef elf_backend_want_dynbss #define elf_backend_want_dynbss 1 #undef elf_backend_may_use_rel_p #define elf_backend_may_use_rel_p 0 #undef elf_backend_may_use_rela_p #define elf_backend_may_use_rela_p 1 #undef elf_backend_default_use_rela_p #define elf_backend_default_use_rela_p 1 #undef elf_backend_got_header_size #define elf_backend_got_header_size (4 * 3) #undef elf_backend_plt_readonly #define elf_backend_plt_readonly 1 #undef bfd_elf32_bfd_reloc_type_lookup #define bfd_elf32_bfd_reloc_type_lookup \ mips_vxworks_bfd_reloc_type_lookup #undef bfd_elf32_bfd_reloc_name_lookup #define bfd_elf32_bfd_reloc_name_lookup \ mips_vxworks_bfd_reloc_name_lookup #undef elf_backend_mips_rtype_to_howto #define elf_backend_mips_rtype_to_howto \ mips_vxworks_rtype_to_howto #undef elf_backend_adjust_dynamic_symbol #define elf_backend_adjust_dynamic_symbol \ _bfd_mips_vxworks_adjust_dynamic_symbol #undef elf_backend_finish_dynamic_symbol #define elf_backend_finish_dynamic_symbol \ _bfd_mips_vxworks_finish_dynamic_symbol #undef bfd_elf32_bfd_link_hash_table_create #define bfd_elf32_bfd_link_hash_table_create \ _bfd_mips_vxworks_link_hash_table_create #undef elf_backend_add_symbol_hook #define elf_backend_add_symbol_hook \ elf_vxworks_add_symbol_hook #undef elf_backend_link_output_symbol_hook #define elf_backend_link_output_symbol_hook \ elf_vxworks_link_output_symbol_hook #undef elf_backend_emit_relocs #define elf_backend_emit_relocs \ elf_vxworks_emit_relocs #undef elf_backend_final_write_processing #define elf_backend_final_write_processing \ mips_vxworks_final_write_processing #undef elf_backend_additional_program_headers #undef elf_backend_modify_segment_map #undef elf_backend_symbol_processing /* NOTE: elf_backend_rela_normal is not defined for MIPS. */ #include "elf32-target.h"
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