2253 lines
67 KiB
C
2253 lines
67 KiB
C
/* MIPS-specific support for 32-bit ELF
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Copyright 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002
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Free Software Foundation, Inc.
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Most of the information added by Ian Lance Taylor, Cygnus Support,
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<ian@cygnus.com>.
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N32/64 ABI support added by Mark Mitchell, CodeSourcery, LLC.
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<mark@codesourcery.com>
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Traditional MIPS targets support added by Koundinya.K, Dansk Data
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Elektronik & Operations Research Group. <kk@ddeorg.soft.net>
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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/* This file handles MIPS ELF targets. SGI Irix 5 uses a slightly
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different MIPS ELF from other targets. This matters when linking.
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This file supports both, switching at runtime. */
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "bfdlink.h"
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#include "genlink.h"
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#include "elf-bfd.h"
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#include "elfxx-mips.h"
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#include "elf/mips.h"
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/* Get the ECOFF swapping routines. */
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#include "coff/sym.h"
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#include "coff/symconst.h"
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#include "coff/internal.h"
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#include "coff/ecoff.h"
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#include "coff/mips.h"
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#define ECOFF_SIGNED_32
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#include "ecoffswap.h"
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static bfd_reloc_status_type mips_elf_hi16_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type mips_elf_lo16_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type mips_elf_got16_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type mips_elf_gprel32_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type mips32_64bit_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static reloc_howto_type *bfd_elf32_bfd_reloc_type_lookup
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PARAMS ((bfd *, bfd_reloc_code_real_type));
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static reloc_howto_type *mips_elf32_rtype_to_howto
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PARAMS ((unsigned int, boolean));
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static void mips_info_to_howto_rel
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PARAMS ((bfd *, arelent *, Elf32_Internal_Rel *));
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static void mips_info_to_howto_rela
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PARAMS ((bfd *, arelent *, Elf32_Internal_Rela *));
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static boolean mips_elf_sym_is_global PARAMS ((bfd *, asymbol *));
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static boolean mips_elf32_object_p PARAMS ((bfd *));
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static boolean mips_elf_is_local_label_name
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PARAMS ((bfd *, const char *));
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static bfd_reloc_status_type mips16_jump_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type mips16_gprel_reloc
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PARAMS ((bfd *, arelent *, asymbol *, PTR, asection *, bfd *, char **));
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static bfd_reloc_status_type mips_elf_final_gp
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PARAMS ((bfd *, asymbol *, boolean, char **, bfd_vma *));
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static boolean mips_elf_assign_gp PARAMS ((bfd *, bfd_vma *));
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static boolean elf32_mips_grok_prstatus
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PARAMS ((bfd *, Elf_Internal_Note *));
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static boolean elf32_mips_grok_psinfo
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PARAMS ((bfd *, Elf_Internal_Note *));
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static boolean elf32_mips_discard_info
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PARAMS ((bfd *, struct elf_reloc_cookie *, struct bfd_link_info *));
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static boolean elf32_mips_ignore_discarded_relocs
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PARAMS ((asection *));
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static boolean elf32_mips_write_section
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PARAMS ((bfd *, asection *, bfd_byte *));
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static irix_compat_t elf32_mips_irix_compat
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PARAMS ((bfd *));
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extern const bfd_target bfd_elf32_tradbigmips_vec;
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extern const bfd_target bfd_elf32_tradlittlemips_vec;
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/* Nonzero if ABFD is using the N32 ABI. */
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#define ABI_N32_P(abfd) \
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((elf_elfheader (abfd)->e_flags & EF_MIPS_ABI2) != 0)
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/* Nonzero if ABFD is using the 64-bit ABI. */
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#define ABI_64_P(abfd) \
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((elf_elfheader (abfd)->e_ident[EI_CLASS] == ELFCLASS64) != 0)
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#define NEWABI_P(abfd) (ABI_N32_P (abfd) || ABI_64_P (abfd))
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/* Whether we are trying to be compatible with IRIX at all. */
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#define SGI_COMPAT(abfd) \
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(elf32_mips_irix_compat (abfd) != ict_none)
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/* The size of an external REL relocation. */
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#define MIPS_ELF_REL_SIZE(abfd) \
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(get_elf_backend_data (abfd)->s->sizeof_rel)
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/* The number of local .got entries we reserve. */
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#define MIPS_RESERVED_GOTNO (2)
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#if 0
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/* We no longer try to identify particular sections for the .dynsym
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section. When we do, we wind up crashing if there are other random
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sections with relocations. */
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/* Names of sections which appear in the .dynsym section in an Irix 5
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executable. */
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static const char * const mips_elf_dynsym_sec_names[] =
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{
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".text",
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".init",
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".fini",
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".data",
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".rodata",
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".sdata",
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".sbss",
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".bss",
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NULL
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};
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#define SIZEOF_MIPS_DYNSYM_SECNAMES \
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(sizeof mips_elf_dynsym_sec_names / sizeof mips_elf_dynsym_sec_names[0])
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/* The number of entries in mips_elf_dynsym_sec_names which go in the
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text segment. */
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#define MIPS_TEXT_DYNSYM_SECNO (3)
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#endif /* 0 */
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/* The names of the runtime procedure table symbols used on Irix 5. */
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static const char * const mips_elf_dynsym_rtproc_names[] =
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{
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"_procedure_table",
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"_procedure_string_table",
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"_procedure_table_size",
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NULL
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};
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/* These structures are used to generate the .compact_rel section on
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Irix 5. */
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typedef struct
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{
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unsigned long id1; /* Always one? */
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unsigned long num; /* Number of compact relocation entries. */
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unsigned long id2; /* Always two? */
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unsigned long offset; /* The file offset of the first relocation. */
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unsigned long reserved0; /* Zero? */
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unsigned long reserved1; /* Zero? */
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} Elf32_compact_rel;
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typedef struct
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{
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bfd_byte id1[4];
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bfd_byte num[4];
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bfd_byte id2[4];
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bfd_byte offset[4];
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bfd_byte reserved0[4];
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bfd_byte reserved1[4];
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} Elf32_External_compact_rel;
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typedef struct
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{
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unsigned int ctype : 1; /* 1: long 0: short format. See below. */
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unsigned int rtype : 4; /* Relocation types. See below. */
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unsigned int dist2to : 8;
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unsigned int relvaddr : 19; /* (VADDR - vaddr of the previous entry)/ 4 */
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unsigned long konst; /* KONST field. See below. */
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unsigned long vaddr; /* VADDR to be relocated. */
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} Elf32_crinfo;
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typedef struct
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{
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unsigned int ctype : 1; /* 1: long 0: short format. See below. */
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unsigned int rtype : 4; /* Relocation types. See below. */
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unsigned int dist2to : 8;
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unsigned int relvaddr : 19; /* (VADDR - vaddr of the previous entry)/ 4 */
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unsigned long konst; /* KONST field. See below. */
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} Elf32_crinfo2;
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typedef struct
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{
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bfd_byte info[4];
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bfd_byte konst[4];
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bfd_byte vaddr[4];
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} Elf32_External_crinfo;
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typedef struct
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{
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bfd_byte info[4];
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bfd_byte konst[4];
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} Elf32_External_crinfo2;
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/* These are the constants used to swap the bitfields in a crinfo. */
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#define CRINFO_CTYPE (0x1)
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#define CRINFO_CTYPE_SH (31)
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#define CRINFO_RTYPE (0xf)
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#define CRINFO_RTYPE_SH (27)
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#define CRINFO_DIST2TO (0xff)
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#define CRINFO_DIST2TO_SH (19)
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#define CRINFO_RELVADDR (0x7ffff)
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#define CRINFO_RELVADDR_SH (0)
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/* A compact relocation info has long (3 words) or short (2 words)
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formats. A short format doesn't have VADDR field and relvaddr
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fields contains ((VADDR - vaddr of the previous entry) >> 2). */
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#define CRF_MIPS_LONG 1
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#define CRF_MIPS_SHORT 0
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/* There are 4 types of compact relocation at least. The value KONST
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has different meaning for each type:
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(type) (konst)
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CT_MIPS_REL32 Address in data
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CT_MIPS_WORD Address in word (XXX)
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CT_MIPS_GPHI_LO GP - vaddr
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CT_MIPS_JMPAD Address to jump
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*/
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#define CRT_MIPS_REL32 0xa
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#define CRT_MIPS_WORD 0xb
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#define CRT_MIPS_GPHI_LO 0xc
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#define CRT_MIPS_JMPAD 0xd
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#define mips_elf_set_cr_format(x,format) ((x).ctype = (format))
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#define mips_elf_set_cr_type(x,type) ((x).rtype = (type))
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#define mips_elf_set_cr_dist2to(x,v) ((x).dist2to = (v))
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#define mips_elf_set_cr_relvaddr(x,d) ((x).relvaddr = (d)<<2)
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/* In case we're on a 32-bit machine, construct a 64-bit "-1" value
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from smaller values. Start with zero, widen, *then* decrement. */
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#define MINUS_ONE (((bfd_vma)0) - 1)
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/* The relocation table used for SHT_REL sections. */
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static reloc_howto_type elf_mips_howto_table_rel[] =
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{
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/* No relocation. */
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HOWTO (R_MIPS_NONE, /* type */
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0, /* rightshift */
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0, /* size (0 = byte, 1 = short, 2 = long) */
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0, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_MIPS_NONE", /* name */
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false, /* partial_inplace */
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0, /* src_mask */
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0, /* dst_mask */
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false), /* pcrel_offset */
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/* 16 bit relocation. */
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HOWTO (R_MIPS_16, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_signed, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_MIPS_16", /* name */
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true, /* partial_inplace */
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0x0000ffff, /* src_mask */
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0x0000ffff, /* dst_mask */
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false), /* pcrel_offset */
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/* 32 bit relocation. */
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HOWTO (R_MIPS_32, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_MIPS_32", /* name */
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true, /* partial_inplace */
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0xffffffff, /* src_mask */
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0xffffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* 32 bit symbol relative relocation. */
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HOWTO (R_MIPS_REL32, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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32, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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bfd_elf_generic_reloc, /* special_function */
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"R_MIPS_REL32", /* name */
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true, /* partial_inplace */
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0xffffffff, /* src_mask */
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0xffffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* 26 bit jump address. */
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HOWTO (R_MIPS_26, /* type */
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2, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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26, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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/* This needs complex overflow
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detection, because the upper four
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bits must match the PC + 4. */
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bfd_elf_generic_reloc, /* special_function */
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"R_MIPS_26", /* name */
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true, /* partial_inplace */
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0x03ffffff, /* src_mask */
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0x03ffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* High 16 bits of symbol value. */
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HOWTO (R_MIPS_HI16, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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mips_elf_hi16_reloc, /* special_function */
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"R_MIPS_HI16", /* name */
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true, /* partial_inplace */
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0x0000ffff, /* src_mask */
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0x0000ffff, /* dst_mask */
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false), /* pcrel_offset */
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/* Low 16 bits of symbol value. */
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HOWTO (R_MIPS_LO16, /* type */
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0, /* rightshift */
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2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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false, /* pc_relative */
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0, /* bitpos */
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complain_overflow_dont, /* complain_on_overflow */
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mips_elf_lo16_reloc, /* special_function */
|
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"R_MIPS_LO16", /* name */
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true, /* partial_inplace */
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0x0000ffff, /* src_mask */
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0x0000ffff, /* dst_mask */
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false), /* pcrel_offset */
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|
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/* GP relative reference. */
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HOWTO (R_MIPS_GPREL16, /* type */
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0, /* rightshift */
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||
2, /* size (0 = byte, 1 = short, 2 = long) */
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||
16, /* bitsize */
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||
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 */
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||
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 */
|
||
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. */
|
||
HOWTO (R_MIPS_PC16, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_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_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_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_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_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_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_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_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_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_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_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_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_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_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_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_elf_generic_reloc, /* special_function */
|
||
"R_MIPS_JALR", /* name */
|
||
false, /* partial_inplace */
|
||
0x00000000, /* src_mask */
|
||
0x00000000, /* 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 */
|
||
|
||
/* The reloc used for the mips16 jump instruction. */
|
||
static reloc_howto_type elf_mips16_jump_howto =
|
||
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. */
|
||
mips16_jump_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. */
|
||
static reloc_howto_type elf_mips16_gprel_howto =
|
||
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 */
|
||
0x07ff001f, /* src_mask */
|
||
0x07ff001f, /* dst_mask */
|
||
false); /* pcrel_offset */
|
||
|
||
/* GNU extensions for embedded-pic. */
|
||
/* High 16 bits of symbol value, pc-relative. */
|
||
static reloc_howto_type elf_mips_gnu_rel_hi16 =
|
||
HOWTO (R_MIPS_GNU_REL_HI16, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
mips_elf_hi16_reloc, /* special_function */
|
||
"R_MIPS_GNU_REL_HI16", /* name */
|
||
true, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
true); /* pcrel_offset */
|
||
|
||
/* Low 16 bits of symbol value, pc-relative. */
|
||
static reloc_howto_type elf_mips_gnu_rel_lo16 =
|
||
HOWTO (R_MIPS_GNU_REL_LO16, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
16, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
mips_elf_lo16_reloc, /* special_function */
|
||
"R_MIPS_GNU_REL_LO16", /* name */
|
||
true, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
true); /* 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_elf_generic_reloc, /* special_function */
|
||
"R_MIPS_GNU_REL16_S2", /* name */
|
||
true, /* partial_inplace */
|
||
0xffff, /* src_mask */
|
||
0xffff, /* dst_mask */
|
||
true); /* pcrel_offset */
|
||
|
||
/* 64 bit pc-relative. */
|
||
static reloc_howto_type elf_mips_gnu_pcrel64 =
|
||
HOWTO (R_MIPS_PC64, /* type */
|
||
0, /* rightshift */
|
||
4, /* size (0 = byte, 1 = short, 2 = long) */
|
||
64, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_signed, /* complain_on_overflow */
|
||
bfd_elf_generic_reloc, /* special_function */
|
||
"R_MIPS_PC64", /* name */
|
||
true, /* partial_inplace */
|
||
MINUS_ONE, /* src_mask */
|
||
MINUS_ONE, /* dst_mask */
|
||
true); /* pcrel_offset */
|
||
|
||
/* 32 bit pc-relative. */
|
||
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_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 */
|
||
|
||
/* Do a R_MIPS_HI16 relocation. This has to be done in combination
|
||
with a R_MIPS_LO16 reloc, because there is a carry from the LO16 to
|
||
the HI16. Here we just save the information we need; we do the
|
||
actual relocation when we see the LO16.
|
||
|
||
MIPS ELF requires that the LO16 immediately follow the HI16. As a
|
||
GNU extension, for non-pc-relative relocations, we permit an
|
||
arbitrary number of HI16 relocs to be associated with a single LO16
|
||
reloc. This extension permits gcc to output the HI and LO relocs
|
||
itself.
|
||
|
||
This cannot be done for PC-relative relocations because both the HI16
|
||
and LO16 parts of the relocations must be done relative to the LO16
|
||
part, and there can be carry to or borrow from the HI16 part. */
|
||
|
||
struct mips_hi16
|
||
{
|
||
struct mips_hi16 *next;
|
||
bfd_byte *addr;
|
||
bfd_vma addend;
|
||
};
|
||
|
||
/* FIXME: This should not be a static variable. */
|
||
|
||
static struct mips_hi16 *mips_hi16_list;
|
||
|
||
static bfd_reloc_status_type
|
||
mips_elf_hi16_reloc (abfd, reloc_entry, symbol, data, input_section,
|
||
output_bfd, error_message)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
arelent *reloc_entry;
|
||
asymbol *symbol;
|
||
PTR data;
|
||
asection *input_section;
|
||
bfd *output_bfd;
|
||
char **error_message;
|
||
{
|
||
bfd_reloc_status_type ret;
|
||
bfd_vma relocation;
|
||
struct mips_hi16 *n;
|
||
|
||
/* If we're relocating, and this an external symbol, we don't want
|
||
to change anything. */
|
||
if (output_bfd != (bfd *) NULL
|
||
&& (symbol->flags & BSF_SECTION_SYM) == 0
|
||
&& reloc_entry->addend == 0)
|
||
{
|
||
reloc_entry->address += input_section->output_offset;
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
ret = bfd_reloc_ok;
|
||
|
||
if (strcmp (bfd_asymbol_name (symbol), "_gp_disp") == 0)
|
||
{
|
||
boolean relocateable;
|
||
bfd_vma gp;
|
||
|
||
if (ret == bfd_reloc_undefined)
|
||
abort ();
|
||
|
||
if (output_bfd != NULL)
|
||
relocateable = true;
|
||
else
|
||
{
|
||
relocateable = false;
|
||
output_bfd = symbol->section->output_section->owner;
|
||
}
|
||
|
||
ret = mips_elf_final_gp (output_bfd, symbol, relocateable,
|
||
error_message, &gp);
|
||
if (ret != bfd_reloc_ok)
|
||
return ret;
|
||
|
||
relocation = gp - reloc_entry->address;
|
||
}
|
||
else
|
||
{
|
||
if (bfd_is_und_section (symbol->section)
|
||
&& output_bfd == (bfd *) NULL)
|
||
ret = bfd_reloc_undefined;
|
||
|
||
if (bfd_is_com_section (symbol->section))
|
||
relocation = 0;
|
||
else
|
||
relocation = symbol->value;
|
||
}
|
||
|
||
relocation += symbol->section->output_section->vma;
|
||
relocation += symbol->section->output_offset;
|
||
relocation += reloc_entry->addend;
|
||
|
||
if (reloc_entry->address > input_section->_cooked_size)
|
||
return bfd_reloc_outofrange;
|
||
|
||
/* Save the information, and let LO16 do the actual relocation. */
|
||
n = (struct mips_hi16 *) bfd_malloc ((bfd_size_type) sizeof *n);
|
||
if (n == NULL)
|
||
return bfd_reloc_outofrange;
|
||
n->addr = (bfd_byte *) data + reloc_entry->address;
|
||
n->addend = relocation;
|
||
n->next = mips_hi16_list;
|
||
mips_hi16_list = n;
|
||
|
||
if (output_bfd != (bfd *) NULL)
|
||
reloc_entry->address += input_section->output_offset;
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Do a R_MIPS_LO16 relocation. This is a straightforward 16 bit
|
||
inplace relocation; this function exists in order to do the
|
||
R_MIPS_HI16 relocation described above. */
|
||
|
||
static bfd_reloc_status_type
|
||
mips_elf_lo16_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;
|
||
{
|
||
arelent gp_disp_relent;
|
||
|
||
if (mips_hi16_list != NULL)
|
||
{
|
||
struct mips_hi16 *l;
|
||
|
||
l = mips_hi16_list;
|
||
while (l != NULL)
|
||
{
|
||
unsigned long insn;
|
||
unsigned long val;
|
||
unsigned long vallo;
|
||
struct mips_hi16 *next;
|
||
|
||
/* Do the HI16 relocation. Note that we actually don't need
|
||
to know anything about the LO16 itself, except where to
|
||
find the low 16 bits of the addend needed by the LO16. */
|
||
insn = bfd_get_32 (abfd, l->addr);
|
||
vallo = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
|
||
|
||
/* The low order 16 bits are always treated as a signed
|
||
value. */
|
||
vallo = ((vallo & 0xffff) ^ 0x8000) - 0x8000;
|
||
val = ((insn & 0xffff) << 16) + vallo;
|
||
val += l->addend;
|
||
|
||
/* If PC-relative, we need to subtract out the address of the LO
|
||
half of the HI/LO. (The actual relocation is relative
|
||
to that instruction.) */
|
||
if (reloc_entry->howto->pc_relative)
|
||
val -= reloc_entry->address;
|
||
|
||
/* At this point, "val" has the value of the combined HI/LO
|
||
pair. If the low order 16 bits (which will be used for
|
||
the LO16 insn) are negative, then we will need an
|
||
adjustment for the high order 16 bits. */
|
||
val += 0x8000;
|
||
val = (val >> 16) & 0xffff;
|
||
|
||
insn &= ~ (bfd_vma) 0xffff;
|
||
insn |= val;
|
||
bfd_put_32 (abfd, (bfd_vma) insn, l->addr);
|
||
|
||
if (strcmp (bfd_asymbol_name (symbol), "_gp_disp") == 0)
|
||
{
|
||
gp_disp_relent = *reloc_entry;
|
||
reloc_entry = &gp_disp_relent;
|
||
reloc_entry->addend = l->addend;
|
||
}
|
||
|
||
next = l->next;
|
||
free (l);
|
||
l = next;
|
||
}
|
||
|
||
mips_hi16_list = NULL;
|
||
}
|
||
else if (strcmp (bfd_asymbol_name (symbol), "_gp_disp") == 0)
|
||
{
|
||
bfd_reloc_status_type ret;
|
||
bfd_vma gp, relocation;
|
||
|
||
/* FIXME: Does this case ever occur? */
|
||
|
||
ret = mips_elf_final_gp (output_bfd, symbol, true, error_message, &gp);
|
||
if (ret != bfd_reloc_ok)
|
||
return ret;
|
||
|
||
relocation = gp - reloc_entry->address;
|
||
relocation += symbol->section->output_section->vma;
|
||
relocation += symbol->section->output_offset;
|
||
relocation += reloc_entry->addend;
|
||
|
||
if (reloc_entry->address > input_section->_cooked_size)
|
||
return bfd_reloc_outofrange;
|
||
|
||
gp_disp_relent = *reloc_entry;
|
||
reloc_entry = &gp_disp_relent;
|
||
reloc_entry->addend = relocation - 4;
|
||
}
|
||
|
||
/* Now do the LO16 reloc in the usual way. */
|
||
return bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
|
||
input_section, output_bfd, error_message);
|
||
}
|
||
|
||
/* Do a R_MIPS_GOT16 reloc. This is a reloc against the global offset
|
||
table used for PIC code. If the symbol is an external symbol, the
|
||
instruction is modified to contain the offset of the appropriate
|
||
entry in the global offset table. If the symbol is a section
|
||
symbol, the next reloc is a R_MIPS_LO16 reloc. The two 16 bit
|
||
addends are combined to form the real addend against the section
|
||
symbol; the GOT16 is modified to contain the offset of an entry in
|
||
the global offset table, and the LO16 is modified to offset it
|
||
appropriately. Thus an offset larger than 16 bits requires a
|
||
modified value in the global offset table.
|
||
|
||
This implementation suffices for the assembler, but the linker does
|
||
not yet know how to create global offset tables. */
|
||
|
||
static bfd_reloc_status_type
|
||
mips_elf_got16_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;
|
||
{
|
||
/* If we're relocating, and this an external symbol, we don't want
|
||
to change anything. */
|
||
if (output_bfd != (bfd *) NULL
|
||
&& (symbol->flags & BSF_SECTION_SYM) == 0
|
||
&& reloc_entry->addend == 0)
|
||
{
|
||
reloc_entry->address += input_section->output_offset;
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
/* If we're relocating, and this is a local symbol, we can handle it
|
||
just like HI16. */
|
||
if (output_bfd != (bfd *) NULL
|
||
&& (symbol->flags & BSF_SECTION_SYM) != 0)
|
||
return mips_elf_hi16_reloc (abfd, reloc_entry, symbol, data,
|
||
input_section, output_bfd, error_message);
|
||
|
||
abort ();
|
||
}
|
||
|
||
/* Set the GP value for OUTPUT_BFD. Returns false if this is a
|
||
dangerous relocation. */
|
||
|
||
static boolean
|
||
mips_elf_assign_gp (output_bfd, pgp)
|
||
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 == (asymbol **) 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 relocateable output. */
|
||
|
||
static bfd_reloc_status_type
|
||
mips_elf_final_gp (output_bfd, symbol, relocateable, error_message, pgp)
|
||
bfd *output_bfd;
|
||
asymbol *symbol;
|
||
boolean relocateable;
|
||
char **error_message;
|
||
bfd_vma *pgp;
|
||
{
|
||
if (bfd_is_und_section (symbol->section)
|
||
&& ! relocateable)
|
||
{
|
||
*pgp = 0;
|
||
return bfd_reloc_undefined;
|
||
}
|
||
|
||
*pgp = _bfd_get_gp_value (output_bfd);
|
||
if (*pgp == 0
|
||
&& (! relocateable
|
||
|| (symbol->flags & BSF_SECTION_SYM) != 0))
|
||
{
|
||
if (relocateable)
|
||
{
|
||
/* 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 (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;
|
||
{
|
||
boolean relocateable;
|
||
bfd_reloc_status_type ret;
|
||
bfd_vma gp;
|
||
|
||
/* If we're relocating, and this is an external symbol with no
|
||
addend, we don't want to change anything. We will only have an
|
||
addend if this is a newly created reloc, not read from an ELF
|
||
file. */
|
||
if (output_bfd != (bfd *) NULL
|
||
&& (symbol->flags & BSF_SECTION_SYM) == 0
|
||
&& reloc_entry->addend == 0)
|
||
{
|
||
reloc_entry->address += input_section->output_offset;
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
if (output_bfd != (bfd *) NULL)
|
||
relocateable = true;
|
||
else
|
||
{
|
||
relocateable = false;
|
||
output_bfd = symbol->section->output_section->owner;
|
||
}
|
||
|
||
ret = mips_elf_final_gp (output_bfd, symbol, relocateable, error_message,
|
||
&gp);
|
||
if (ret != bfd_reloc_ok)
|
||
return ret;
|
||
|
||
return _bfd_mips_elf_gprel16_with_gp (abfd, symbol, reloc_entry,
|
||
input_section, relocateable,
|
||
data, gp);
|
||
}
|
||
|
||
/* Do a R_MIPS_GPREL32 relocation. Is this 32 bit value the offset
|
||
from the gp register? XXX */
|
||
|
||
static bfd_reloc_status_type gprel32_with_gp PARAMS ((bfd *, asymbol *,
|
||
arelent *, asection *,
|
||
boolean, PTR, bfd_vma));
|
||
|
||
static bfd_reloc_status_type
|
||
mips_elf_gprel32_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;
|
||
{
|
||
boolean relocateable;
|
||
bfd_reloc_status_type ret;
|
||
bfd_vma gp;
|
||
|
||
/* If we're relocating, and this is an external symbol with no
|
||
addend, we don't want to change anything. We will only have an
|
||
addend if this is a newly created reloc, not read from an ELF
|
||
file. */
|
||
if (output_bfd != (bfd *) NULL
|
||
&& (symbol->flags & BSF_SECTION_SYM) == 0
|
||
&& reloc_entry->addend == 0)
|
||
{
|
||
*error_message = (char *)
|
||
_("32bits gp relative relocation occurs for an external symbol");
|
||
return bfd_reloc_outofrange;
|
||
}
|
||
|
||
if (output_bfd != (bfd *) NULL)
|
||
{
|
||
relocateable = true;
|
||
gp = _bfd_get_gp_value (output_bfd);
|
||
}
|
||
else
|
||
{
|
||
relocateable = false;
|
||
output_bfd = symbol->section->output_section->owner;
|
||
|
||
ret = mips_elf_final_gp (output_bfd, symbol, relocateable,
|
||
error_message, &gp);
|
||
if (ret != bfd_reloc_ok)
|
||
return ret;
|
||
}
|
||
|
||
return gprel32_with_gp (abfd, symbol, reloc_entry, input_section,
|
||
relocateable, data, gp);
|
||
}
|
||
|
||
static bfd_reloc_status_type
|
||
gprel32_with_gp (abfd, symbol, reloc_entry, input_section, relocateable, data,
|
||
gp)
|
||
bfd *abfd;
|
||
asymbol *symbol;
|
||
arelent *reloc_entry;
|
||
asection *input_section;
|
||
boolean relocateable;
|
||
PTR data;
|
||
bfd_vma gp;
|
||
{
|
||
bfd_vma relocation;
|
||
unsigned long 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 > input_section->_cooked_size)
|
||
return bfd_reloc_outofrange;
|
||
|
||
if (reloc_entry->howto->src_mask == 0)
|
||
{
|
||
/* This case arises with the 64-bit MIPS ELF ABI. */
|
||
val = 0;
|
||
}
|
||
else
|
||
val = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
|
||
|
||
/* Set val to the offset into the section or symbol. */
|
||
val += reloc_entry->addend;
|
||
|
||
/* Adjust val for the final section location and GP value. If we
|
||
are producing relocateable output, we don't want to do this for
|
||
an external symbol. */
|
||
if (! relocateable
|
||
|| (symbol->flags & BSF_SECTION_SYM) != 0)
|
||
val += relocation - gp;
|
||
|
||
bfd_put_32 (abfd, (bfd_vma) val, (bfd_byte *) data + reloc_entry->address);
|
||
|
||
if (relocateable)
|
||
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 (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;
|
||
{
|
||
bfd_reloc_status_type r;
|
||
arelent reloc32;
|
||
unsigned long val;
|
||
bfd_size_type addr;
|
||
|
||
r = bfd_elf_generic_reloc (abfd, reloc_entry, symbol, data,
|
||
input_section, output_bfd, error_message);
|
||
if (r != bfd_reloc_continue)
|
||
return r;
|
||
|
||
/* 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, (bfd_vma) val, (bfd_byte *) data + addr);
|
||
|
||
return r;
|
||
}
|
||
|
||
/* Handle a mips16 jump. */
|
||
|
||
static bfd_reloc_status_type
|
||
mips16_jump_reloc (abfd, reloc_entry, symbol, data, input_section,
|
||
output_bfd, error_message)
|
||
bfd *abfd ATTRIBUTE_UNUSED;
|
||
arelent *reloc_entry;
|
||
asymbol *symbol;
|
||
PTR data ATTRIBUTE_UNUSED;
|
||
asection *input_section;
|
||
bfd *output_bfd;
|
||
char **error_message ATTRIBUTE_UNUSED;
|
||
{
|
||
if (output_bfd != (bfd *) NULL
|
||
&& (symbol->flags & BSF_SECTION_SYM) == 0
|
||
&& reloc_entry->addend == 0)
|
||
{
|
||
reloc_entry->address += input_section->output_offset;
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
/* FIXME. */
|
||
{
|
||
static boolean warned;
|
||
|
||
if (! warned)
|
||
(*_bfd_error_handler)
|
||
(_("Linking mips16 objects into %s format is not supported"),
|
||
bfd_get_target (input_section->output_section->owner));
|
||
warned = true;
|
||
}
|
||
|
||
return bfd_reloc_undefined;
|
||
}
|
||
|
||
/* Handle a mips16 GP relative reloc. */
|
||
|
||
static bfd_reloc_status_type
|
||
mips16_gprel_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;
|
||
{
|
||
boolean relocateable;
|
||
bfd_reloc_status_type ret;
|
||
bfd_vma gp;
|
||
unsigned short extend, insn;
|
||
unsigned long final;
|
||
|
||
/* If we're relocating, and this is an external symbol with no
|
||
addend, we don't want to change anything. We will only have an
|
||
addend if this is a newly created reloc, not read from an ELF
|
||
file. */
|
||
if (output_bfd != NULL
|
||
&& (symbol->flags & BSF_SECTION_SYM) == 0
|
||
&& reloc_entry->addend == 0)
|
||
{
|
||
reloc_entry->address += input_section->output_offset;
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
if (output_bfd != NULL)
|
||
relocateable = true;
|
||
else
|
||
{
|
||
relocateable = false;
|
||
output_bfd = symbol->section->output_section->owner;
|
||
}
|
||
|
||
ret = mips_elf_final_gp (output_bfd, symbol, relocateable, error_message,
|
||
&gp);
|
||
if (ret != bfd_reloc_ok)
|
||
return ret;
|
||
|
||
if (reloc_entry->address > input_section->_cooked_size)
|
||
return bfd_reloc_outofrange;
|
||
|
||
/* Pick up the mips16 extend instruction and the real instruction. */
|
||
extend = bfd_get_16 (abfd, (bfd_byte *) data + reloc_entry->address);
|
||
insn = bfd_get_16 (abfd, (bfd_byte *) data + reloc_entry->address + 2);
|
||
|
||
/* Stuff the current addend back as a 32 bit value, do the usual
|
||
relocation, and then clean up. */
|
||
bfd_put_32 (abfd,
|
||
(bfd_vma) (((extend & 0x1f) << 11)
|
||
| (extend & 0x7e0)
|
||
| (insn & 0x1f)),
|
||
(bfd_byte *) data + reloc_entry->address);
|
||
|
||
ret = _bfd_mips_elf_gprel16_with_gp (abfd, symbol, reloc_entry,
|
||
input_section, relocateable, data, gp);
|
||
|
||
final = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
|
||
bfd_put_16 (abfd,
|
||
(bfd_vma) ((extend & 0xf800)
|
||
| ((final >> 11) & 0x1f)
|
||
| (final & 0x7e0)),
|
||
(bfd_byte *) data + reloc_entry->address);
|
||
bfd_put_16 (abfd,
|
||
(bfd_vma) ((insn & 0xffe0)
|
||
| (final & 0x1f)),
|
||
(bfd_byte *) data + reloc_entry->address + 2);
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* A mapping from BFD reloc types to MIPS ELF reloc types. */
|
||
|
||
struct elf_reloc_map {
|
||
bfd_reloc_code_real_type bfd_reloc_val;
|
||
enum elf_mips_reloc_type elf_reloc_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 },
|
||
{ 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, 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 }
|
||
};
|
||
|
||
/* Given a BFD reloc type, return a howto structure. */
|
||
|
||
static reloc_howto_type *
|
||
bfd_elf32_bfd_reloc_type_lookup (abfd, code)
|
||
bfd *abfd;
|
||
bfd_reloc_code_real_type code;
|
||
{
|
||
unsigned int i;
|
||
|
||
for (i = 0; i < sizeof (mips_reloc_map) / sizeof (struct elf_reloc_map); i++)
|
||
{
|
||
if (mips_reloc_map[i].bfd_reloc_val == code)
|
||
return &elf_mips_howto_table_rel[(int) mips_reloc_map[i].elf_reloc_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 on this architecture. */
|
||
if (bfd_arch_bits_per_address (abfd) == 32)
|
||
return &elf_mips_howto_table_rel[(int) R_MIPS_32];
|
||
else
|
||
return &elf_mips_ctor64_howto;
|
||
|
||
case BFD_RELOC_MIPS16_JMP:
|
||
return &elf_mips16_jump_howto;
|
||
case BFD_RELOC_MIPS16_GPREL:
|
||
return &elf_mips16_gprel_howto;
|
||
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_PCREL_HI16_S:
|
||
return &elf_mips_gnu_rel_hi16;
|
||
case BFD_RELOC_PCREL_LO16:
|
||
return &elf_mips_gnu_rel_lo16;
|
||
case BFD_RELOC_16_PCREL_S2:
|
||
return &elf_mips_gnu_rel16_s2;
|
||
case BFD_RELOC_64_PCREL:
|
||
return &elf_mips_gnu_pcrel64;
|
||
case BFD_RELOC_32_PCREL:
|
||
return &elf_mips_gnu_pcrel32;
|
||
}
|
||
}
|
||
|
||
/* Given a MIPS Elf32_Internal_Rel, fill in an arelent structure. */
|
||
|
||
static reloc_howto_type *
|
||
mips_elf32_rtype_to_howto (r_type, rela_p)
|
||
unsigned int r_type;
|
||
boolean rela_p ATTRIBUTE_UNUSED;
|
||
{
|
||
switch (r_type)
|
||
{
|
||
case R_MIPS16_26:
|
||
return &elf_mips16_jump_howto;
|
||
break;
|
||
case R_MIPS16_GPREL:
|
||
return &elf_mips16_gprel_howto;
|
||
break;
|
||
case R_MIPS_GNU_VTINHERIT:
|
||
return &elf_mips_gnu_vtinherit_howto;
|
||
break;
|
||
case R_MIPS_GNU_VTENTRY:
|
||
return &elf_mips_gnu_vtentry_howto;
|
||
break;
|
||
case R_MIPS_GNU_REL_HI16:
|
||
return &elf_mips_gnu_rel_hi16;
|
||
break;
|
||
case R_MIPS_GNU_REL_LO16:
|
||
return &elf_mips_gnu_rel_lo16;
|
||
break;
|
||
case R_MIPS_GNU_REL16_S2:
|
||
return &elf_mips_gnu_rel16_s2;
|
||
break;
|
||
case R_MIPS_PC64:
|
||
return &elf_mips_gnu_pcrel64;
|
||
break;
|
||
case R_MIPS_PC32:
|
||
return &elf_mips_gnu_pcrel32;
|
||
break;
|
||
|
||
default:
|
||
BFD_ASSERT (r_type < (unsigned int) R_MIPS_max);
|
||
return &elf_mips_howto_table_rel[r_type];
|
||
}
|
||
}
|
||
|
||
/* Given a MIPS Elf32_Internal_Rel, fill in an arelent structure. */
|
||
|
||
static void
|
||
mips_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);
|
||
cache_ptr->howto = mips_elf32_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 Elf32_Internal_Rela, fill in an arelent structure. */
|
||
|
||
static void
|
||
mips_info_to_howto_rela (abfd, cache_ptr, dst)
|
||
bfd *abfd;
|
||
arelent *cache_ptr;
|
||
Elf32_Internal_Rela *dst;
|
||
{
|
||
/* Since an Elf32_Internal_Rel is an initial prefix of an
|
||
Elf32_Internal_Rela, we can just use mips_info_to_howto_rel
|
||
above. */
|
||
mips_info_to_howto_rel (abfd, cache_ptr, (Elf32_Internal_Rel *) dst);
|
||
|
||
/* If we ever need to do any extra processing with dst->r_addend
|
||
(the field omitted in an Elf32_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 boolean
|
||
mips_elf_sym_is_global (abfd, sym)
|
||
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 boolean
|
||
mips_elf32_object_p (abfd)
|
||
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;
|
||
|
||
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 '$', not 'L'. */
|
||
|
||
static boolean
|
||
mips_elf_is_local_label_name (abfd, name)
|
||
bfd *abfd;
|
||
const char *name;
|
||
{
|
||
if (name[0] == '$')
|
||
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 boolean
|
||
elf32_mips_grok_prstatus (abfd, note)
|
||
bfd *abfd;
|
||
Elf_Internal_Note *note;
|
||
{
|
||
int offset;
|
||
unsigned int raw_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;
|
||
raw_size = 180;
|
||
|
||
break;
|
||
}
|
||
|
||
/* Make a ".reg/999" section. */
|
||
return _bfd_elfcore_make_pseudosection (abfd, ".reg",
|
||
raw_size, note->descpos + offset);
|
||
}
|
||
|
||
static boolean
|
||
elf32_mips_grok_psinfo (abfd, note)
|
||
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;
|
||
}
|
||
|
||
#define PDR_SIZE 32
|
||
|
||
static boolean
|
||
elf32_mips_discard_info (abfd, cookie, info)
|
||
bfd *abfd;
|
||
struct elf_reloc_cookie *cookie;
|
||
struct bfd_link_info *info;
|
||
{
|
||
asection *o;
|
||
struct elf_backend_data *bed = get_elf_backend_data (abfd);
|
||
boolean ret = false;
|
||
unsigned char *tdata;
|
||
size_t i, skip;
|
||
|
||
o = bfd_get_section_by_name (abfd, ".pdr");
|
||
if (! o)
|
||
return false;
|
||
if (o->_raw_size == 0)
|
||
return false;
|
||
if (o->_raw_size % PDR_SIZE != 0)
|
||
return false;
|
||
if (o->output_section != NULL
|
||
&& bfd_is_abs_section (o->output_section))
|
||
return false;
|
||
|
||
tdata = bfd_zmalloc (o->_raw_size / PDR_SIZE);
|
||
if (! tdata)
|
||
return false;
|
||
|
||
cookie->rels = _bfd_elf32_link_read_relocs (abfd, o, (PTR) NULL,
|
||
(Elf_Internal_Rela *) NULL,
|
||
info->keep_memory);
|
||
if (!cookie->rels)
|
||
{
|
||
free (tdata);
|
||
return false;
|
||
}
|
||
|
||
cookie->rel = cookie->rels;
|
||
cookie->relend =
|
||
cookie->rels + o->reloc_count * bed->s->int_rels_per_ext_rel;
|
||
|
||
for (i = 0, skip = 0; i < o->_raw_size; i ++)
|
||
{
|
||
if (_bfd_elf32_reloc_symbol_deleted_p (i * PDR_SIZE, cookie))
|
||
{
|
||
tdata[i] = 1;
|
||
skip ++;
|
||
}
|
||
}
|
||
|
||
if (skip != 0)
|
||
{
|
||
elf_section_data (o)->tdata = tdata;
|
||
o->_cooked_size = o->_raw_size - skip * PDR_SIZE;
|
||
ret = true;
|
||
}
|
||
else
|
||
free (tdata);
|
||
|
||
if (! info->keep_memory)
|
||
free (cookie->rels);
|
||
|
||
return ret;
|
||
}
|
||
|
||
static boolean
|
||
elf32_mips_ignore_discarded_relocs (sec)
|
||
asection *sec;
|
||
{
|
||
if (strcmp (sec->name, ".pdr") == 0)
|
||
return true;
|
||
return false;
|
||
}
|
||
|
||
static boolean
|
||
elf32_mips_write_section (output_bfd, sec, contents)
|
||
bfd *output_bfd;
|
||
asection *sec;
|
||
bfd_byte *contents;
|
||
{
|
||
bfd_byte *to, *from, *end;
|
||
int i;
|
||
|
||
if (strcmp (sec->name, ".pdr") != 0)
|
||
return false;
|
||
|
||
if (elf_section_data (sec)->tdata == NULL)
|
||
return false;
|
||
|
||
to = contents;
|
||
end = contents + sec->_raw_size;
|
||
for (from = contents, i = 0;
|
||
from < end;
|
||
from += PDR_SIZE, i++)
|
||
{
|
||
if (((unsigned char *)elf_section_data (sec)->tdata)[i] == 1)
|
||
continue;
|
||
if (to != from)
|
||
memcpy (to, from, PDR_SIZE);
|
||
to += PDR_SIZE;
|
||
}
|
||
bfd_set_section_contents (output_bfd, sec->output_section, contents,
|
||
(file_ptr) sec->output_offset,
|
||
sec->_cooked_size);
|
||
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 (abfd)
|
||
bfd *abfd;
|
||
{
|
||
if ((abfd->xvec == &bfd_elf32_tradbigmips_vec)
|
||
|| (abfd->xvec == &bfd_elf32_tradlittlemips_vec))
|
||
return ict_none;
|
||
else
|
||
return ict_irix5;
|
||
}
|
||
|
||
/* Given a data section and an in-memory embedded reloc section, store
|
||
relocation information into the embedded reloc section which can be
|
||
used at runtime to relocate the data section. This is called by the
|
||
linker when the --embedded-relocs switch is used. This is called
|
||
after the add_symbols entry point has been called for all the
|
||
objects, and before the final_link entry point is called. */
|
||
|
||
boolean
|
||
bfd_mips_elf32_create_embedded_relocs (abfd, info, datasec, relsec, errmsg)
|
||
bfd *abfd;
|
||
struct bfd_link_info *info;
|
||
asection *datasec;
|
||
asection *relsec;
|
||
char **errmsg;
|
||
{
|
||
Elf_Internal_Shdr *symtab_hdr;
|
||
Elf_Internal_Shdr *shndx_hdr;
|
||
Elf32_External_Sym *extsyms;
|
||
Elf32_External_Sym *free_extsyms = NULL;
|
||
Elf_External_Sym_Shndx *shndx_buf = NULL;
|
||
Elf_Internal_Rela *internal_relocs;
|
||
Elf_Internal_Rela *free_relocs = NULL;
|
||
Elf_Internal_Rela *irel, *irelend;
|
||
bfd_byte *p;
|
||
bfd_size_type amt;
|
||
|
||
BFD_ASSERT (! info->relocateable);
|
||
|
||
*errmsg = NULL;
|
||
|
||
if (datasec->reloc_count == 0)
|
||
return true;
|
||
|
||
symtab_hdr = &elf_tdata (abfd)->symtab_hdr;
|
||
/* Read this BFD's symbols if we haven't done so already, or get the cached
|
||
copy if it exists. */
|
||
if (symtab_hdr->contents != NULL)
|
||
extsyms = (Elf32_External_Sym *) symtab_hdr->contents;
|
||
else
|
||
{
|
||
/* Go get them off disk. */
|
||
if (info->keep_memory)
|
||
extsyms = ((Elf32_External_Sym *)
|
||
bfd_alloc (abfd, symtab_hdr->sh_size));
|
||
else
|
||
extsyms = ((Elf32_External_Sym *)
|
||
bfd_malloc (symtab_hdr->sh_size));
|
||
if (extsyms == NULL)
|
||
goto error_return;
|
||
if (! info->keep_memory)
|
||
free_extsyms = extsyms;
|
||
if (bfd_seek (abfd, symtab_hdr->sh_offset, SEEK_SET) != 0
|
||
|| (bfd_bread (extsyms, symtab_hdr->sh_size, abfd)
|
||
!= symtab_hdr->sh_size))
|
||
goto error_return;
|
||
if (info->keep_memory)
|
||
symtab_hdr->contents = (unsigned char *) extsyms;
|
||
}
|
||
|
||
shndx_hdr = &elf_tdata (abfd)->symtab_shndx_hdr;
|
||
if (shndx_hdr->sh_size != 0)
|
||
{
|
||
amt = symtab_hdr->sh_info * sizeof (Elf_External_Sym_Shndx);
|
||
shndx_buf = (Elf_External_Sym_Shndx *) bfd_malloc (amt);
|
||
if (shndx_buf == NULL)
|
||
goto error_return;
|
||
if (bfd_seek (abfd, shndx_hdr->sh_offset, SEEK_SET) != 0
|
||
|| bfd_bread ((PTR) shndx_buf, amt, abfd) != amt)
|
||
goto error_return;
|
||
}
|
||
|
||
/* Get a copy of the native relocations. */
|
||
internal_relocs = (_bfd_elf32_link_read_relocs
|
||
(abfd, datasec, (PTR) NULL, (Elf_Internal_Rela *) NULL,
|
||
info->keep_memory));
|
||
if (internal_relocs == NULL)
|
||
goto error_return;
|
||
if (! info->keep_memory)
|
||
free_relocs = internal_relocs;
|
||
|
||
relsec->contents = (bfd_byte *) bfd_alloc (abfd, datasec->reloc_count * 12);
|
||
if (relsec->contents == NULL)
|
||
goto error_return;
|
||
|
||
p = relsec->contents;
|
||
|
||
irelend = internal_relocs + datasec->reloc_count;
|
||
|
||
for (irel = internal_relocs; irel < irelend; irel++, p += 12)
|
||
{
|
||
asection *targetsec;
|
||
|
||
/* We are going to write a four byte longword into the runtime
|
||
reloc section. The longword will be the address in the data
|
||
section which must be relocated. It is followed by the name
|
||
of the target section NUL-padded or truncated to 8
|
||
characters. */
|
||
|
||
/* We can only relocate absolute longword relocs at run time. */
|
||
if ((ELF32_R_TYPE (irel->r_info) != (int) R_MIPS_32) &&
|
||
(ELF32_R_TYPE (irel->r_info) != (int) R_MIPS_64))
|
||
{
|
||
*errmsg = _("unsupported reloc type");
|
||
bfd_set_error (bfd_error_bad_value);
|
||
goto error_return;
|
||
}
|
||
/* Get the target section referred to by the reloc. */
|
||
if (ELF32_R_SYM (irel->r_info) < symtab_hdr->sh_info)
|
||
{
|
||
Elf32_External_Sym *esym;
|
||
Elf_External_Sym_Shndx *shndx;
|
||
Elf_Internal_Sym isym;
|
||
|
||
/* A local symbol. */
|
||
esym = extsyms + ELF32_R_SYM (irel->r_info);
|
||
shndx = shndx_buf + (shndx_buf ? ELF32_R_SYM (irel->r_info) : 0);
|
||
bfd_elf32_swap_symbol_in (abfd, esym, shndx, &isym);
|
||
|
||
targetsec = bfd_section_from_elf_index (abfd, isym.st_shndx);
|
||
}
|
||
else
|
||
{
|
||
unsigned long indx;
|
||
struct elf_link_hash_entry *h;
|
||
|
||
/* An external symbol. */
|
||
indx = ELF32_R_SYM (irel->r_info);
|
||
h = elf_sym_hashes (abfd)[indx];
|
||
targetsec = NULL;
|
||
/*
|
||
For some reason, in certain programs, the symbol will
|
||
not be in the hash table. It seems to happen when you
|
||
declare a static table of pointers to const external structures.
|
||
In this case, the relocs are relative to data, not
|
||
text, so just treating it like an undefined link
|
||
should be sufficient. */
|
||
BFD_ASSERT(h != NULL);
|
||
if (h->root.type == bfd_link_hash_defined
|
||
|| h->root.type == bfd_link_hash_defweak)
|
||
targetsec = h->root.u.def.section;
|
||
}
|
||
|
||
|
||
/*
|
||
Set the low bit of the relocation offset if it's a MIPS64 reloc.
|
||
Relocations will always be on (at least) 32-bit boundaries. */
|
||
|
||
bfd_put_32 (abfd, ((irel->r_offset + datasec->output_offset) +
|
||
((ELF32_R_TYPE (irel->r_info) == (int) R_MIPS_64) ? 1 : 0)),
|
||
p);
|
||
memset (p + 4, 0, 8);
|
||
if (targetsec != NULL)
|
||
strncpy (p + 4, targetsec->output_section->name, 8);
|
||
}
|
||
|
||
if (shndx_buf != NULL)
|
||
free (shndx_buf);
|
||
if (free_extsyms != NULL)
|
||
free (free_extsyms);
|
||
if (free_relocs != NULL)
|
||
free (free_relocs);
|
||
return true;
|
||
|
||
error_return:
|
||
if (shndx_buf != NULL)
|
||
free (shndx_buf);
|
||
if (free_extsyms != NULL)
|
||
free (free_extsyms);
|
||
if (free_relocs != NULL)
|
||
free (free_relocs);
|
||
return false;
|
||
}
|
||
|
||
/* 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
|
||
|
||
/* 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_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_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_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_plt_header_size 0
|
||
#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 elf32_mips_discard_info
|
||
#define elf_backend_ignore_discarded_relocs \
|
||
elf32_mips_ignore_discarded_relocs
|
||
#define elf_backend_write_section elf32_mips_write_section
|
||
#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_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"
|
||
|
||
#include "elf32-target.h"
|
||
|
||
/* Support for traditional mips targets. */
|
||
#define INCLUDED_TARGET_FILE /* More a type of flag. */
|
||
|
||
#undef TARGET_LITTLE_SYM
|
||
#undef TARGET_LITTLE_NAME
|
||
#undef TARGET_BIG_SYM
|
||
#undef TARGET_BIG_NAME
|
||
|
||
#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"
|
||
|
||
/* Include the target file again for this target. */
|
||
#include "elf32-target.h"
|