dabf906e9b
(mips_ecoff_swap_reloc_in): For MIPS_R_SWTICH, copy r_symndx into r_offset and set r_symndx to RELOC_SECTION_TEXT. (mips_ecoff_swap_reloc_out): For MIPS_R_SWITCH, get the r_symndx value from the r_offset field. (mips_adjust_reloc_in): Maximum r_type value is now MIPS_R_SWITCH. For MIPS_R_SWITCH, copy the r_offset field into the addend field. (mips_adjust_reloc_out): For MIPS_R_SWITCH, copy the addend field into the r_offset field. (mips_switch_reloc): New function. (mips_bfd_reloc_type_lookup): Translate BFD_RELOC_GPREL32 into MIPS_R_SWITCH. (mips_relocate_section): Handle MIPS_R_SWITCH. (mips_relax_section): Adjust MIPS_R_SWITCH offset if necessary.
2028 lines
63 KiB
C
2028 lines
63 KiB
C
/* BFD back-end for MIPS Extended-Coff files.
|
||
Copyright 1990, 1991, 1992, 1993, 1994 Free Software Foundation, Inc.
|
||
Original version by Per Bothner.
|
||
Full support added by Ian Lance Taylor, ian@cygnus.com.
|
||
|
||
This file is part of BFD, the Binary File Descriptor library.
|
||
|
||
This program is free software; you can redistribute it and/or modify
|
||
it under the terms of the GNU General Public License as published by
|
||
the Free Software Foundation; either version 2 of the License, or
|
||
(at your option) any later version.
|
||
|
||
This program is distributed in the hope that it will be useful,
|
||
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||
GNU General Public License for more details.
|
||
|
||
You should have received a copy of the GNU General Public License
|
||
along with this program; if not, write to the Free Software
|
||
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
|
||
|
||
#include "bfd.h"
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#include "sysdep.h"
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#include "bfdlink.h"
|
||
#include "libbfd.h"
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#include "coff/internal.h"
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#include "coff/sym.h"
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#include "coff/symconst.h"
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#include "coff/ecoff.h"
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#include "coff/mips.h"
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#include "libcoff.h"
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#include "libecoff.h"
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/* Prototypes for static functions. */
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static boolean mips_ecoff_bad_format_hook PARAMS ((bfd *abfd, PTR filehdr));
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static void mips_ecoff_swap_reloc_in PARAMS ((bfd *, PTR,
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struct internal_reloc *));
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static void mips_ecoff_swap_reloc_out PARAMS ((bfd *,
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const struct internal_reloc *,
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PTR));
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static void mips_adjust_reloc_in PARAMS ((bfd *,
|
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const struct internal_reloc *,
|
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arelent *));
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static void mips_adjust_reloc_out PARAMS ((bfd *, const arelent *,
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struct internal_reloc *));
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static bfd_reloc_status_type mips_generic_reloc PARAMS ((bfd *abfd,
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arelent *reloc,
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asymbol *symbol,
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PTR data,
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asection *section,
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bfd *output_bfd,
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char **error));
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static bfd_reloc_status_type mips_refhi_reloc PARAMS ((bfd *abfd,
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arelent *reloc,
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asymbol *symbol,
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PTR data,
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asection *section,
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bfd *output_bfd,
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char **error));
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static bfd_reloc_status_type mips_reflo_reloc PARAMS ((bfd *abfd,
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arelent *reloc,
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asymbol *symbol,
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PTR data,
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asection *section,
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bfd *output_bfd,
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char **error));
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static bfd_reloc_status_type mips_gprel_reloc PARAMS ((bfd *abfd,
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arelent *reloc,
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asymbol *symbol,
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PTR data,
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asection *section,
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bfd *output_bfd,
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char **error));
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static bfd_reloc_status_type mips_switch_reloc PARAMS ((bfd *abfd,
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arelent *reloc,
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asymbol *symbol,
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PTR data,
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asection *section,
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bfd *output_bfd,
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char **error));
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static void mips_relocate_refhi PARAMS ((struct internal_reloc *refhi,
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struct internal_reloc *reflo,
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bfd *input_bfd,
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asection *input_section,
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bfd_byte *contents,
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size_t adjust,
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bfd_vma relocation));
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static boolean mips_relocate_section PARAMS ((bfd *, struct bfd_link_info *,
|
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bfd *, asection *,
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bfd_byte *, PTR));
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static boolean mips_relax_section PARAMS ((bfd *, asection *,
|
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struct bfd_link_info *,
|
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boolean *));
|
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static boolean mips_relax_pcrel16 PARAMS ((struct bfd_link_info *, bfd *,
|
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asection *,
|
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struct ecoff_link_hash_entry *,
|
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bfd_byte *, bfd_vma));
|
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|
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/* ECOFF has COFF sections, but the debugging information is stored in
|
||
a completely different format. ECOFF targets use some of the
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swapping routines from coffswap.h, and some of the generic COFF
|
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routines in coffgen.c, but, unlike the real COFF targets, do not
|
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use coffcode.h itself.
|
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|
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Get the generic COFF swapping routines, except for the reloc,
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symbol, and lineno ones. Give them ECOFF names. */
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#define MIPSECOFF
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#define NO_COFF_RELOCS
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#define NO_COFF_SYMBOLS
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#define NO_COFF_LINENOS
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#define coff_swap_filehdr_in mips_ecoff_swap_filehdr_in
|
||
#define coff_swap_filehdr_out mips_ecoff_swap_filehdr_out
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#define coff_swap_aouthdr_in mips_ecoff_swap_aouthdr_in
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#define coff_swap_aouthdr_out mips_ecoff_swap_aouthdr_out
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#define coff_swap_scnhdr_in mips_ecoff_swap_scnhdr_in
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#define coff_swap_scnhdr_out mips_ecoff_swap_scnhdr_out
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#include "coffswap.h"
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/* Get the ECOFF swapping routines. */
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#define ECOFF_32
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#include "ecoffswap.h"
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/* How to process the various relocs types. */
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static reloc_howto_type mips_howto_table[] =
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{
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/* Reloc type 0 is ignored. The reloc reading code ensures that
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this is a reference to the .abs section, which will cause
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bfd_perform_relocation to do nothing. */
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HOWTO (MIPS_R_IGNORE, /* type */
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0, /* rightshift */
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0, /* size (0 = byte, 1 = short, 2 = long) */
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8, /* 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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0, /* special_function */
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"IGNORE", /* 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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/* A 16 bit reference to a symbol, normally from a data section. */
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HOWTO (MIPS_R_REFHALF, /* type */
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0, /* rightshift */
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1, /* 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_bitfield, /* complain_on_overflow */
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mips_generic_reloc, /* special_function */
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"REFHALF", /* name */
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true, /* partial_inplace */
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0xffff, /* src_mask */
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0xffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A 32 bit reference to a symbol, normally from a data section. */
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HOWTO (MIPS_R_REFWORD, /* 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_bitfield, /* complain_on_overflow */
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mips_generic_reloc, /* special_function */
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"REFWORD", /* 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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/* A 26 bit absolute jump address. */
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HOWTO (MIPS_R_JMPADDR, /* 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. */
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mips_generic_reloc, /* special_function */
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"JMPADDR", /* name */
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true, /* partial_inplace */
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0x3ffffff, /* src_mask */
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0x3ffffff, /* dst_mask */
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false), /* pcrel_offset */
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/* The high 16 bits of a symbol value. Handled by the function
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mips_refhi_reloc. */
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HOWTO (MIPS_R_REFHI, /* type */
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16, /* 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_bitfield, /* complain_on_overflow */
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mips_refhi_reloc, /* special_function */
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"REFHI", /* name */
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true, /* partial_inplace */
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0xffff, /* src_mask */
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0xffff, /* dst_mask */
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false), /* pcrel_offset */
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/* The low 16 bits of a symbol value. */
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HOWTO (MIPS_R_REFLO, /* 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_reflo_reloc, /* special_function */
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"REFLO", /* name */
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true, /* partial_inplace */
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0xffff, /* src_mask */
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0xffff, /* dst_mask */
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false), /* pcrel_offset */
|
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|
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/* A reference to an offset from the gp register. Handled by the
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function mips_gprel_reloc. */
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HOWTO (MIPS_R_GPREL, /* 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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mips_gprel_reloc, /* special_function */
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"GPREL", /* name */
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true, /* partial_inplace */
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0xffff, /* src_mask */
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0xffff, /* dst_mask */
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false), /* pcrel_offset */
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/* A reference to a literal using an offset from the gp register.
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Handled by the function mips_gprel_reloc. */
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HOWTO (MIPS_R_LITERAL, /* 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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mips_gprel_reloc, /* special_function */
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"LITERAL", /* name */
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true, /* partial_inplace */
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0xffff, /* src_mask */
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0xffff, /* dst_mask */
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false), /* pcrel_offset */
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|
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/* This reloc is a Cygnus extension used when generating position
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independent code for embedded systems. It represents a 16 bit PC
|
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relative reloc rightshifted twice as used in the MIPS branch
|
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instructions. */
|
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HOWTO (MIPS_R_PCREL16, /* type */
|
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2, /* rightshift */
|
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2, /* size (0 = byte, 1 = short, 2 = long) */
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16, /* bitsize */
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true, /* pc_relative */
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0, /* bitpos */
|
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complain_overflow_signed, /* complain_on_overflow */
|
||
mips_generic_reloc, /* special_function */
|
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"PCREL16", /* name */
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true, /* partial_inplace */
|
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0xffff, /* src_mask */
|
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0xffff, /* dst_mask */
|
||
true), /* pcrel_offset */
|
||
|
||
/* This reloc is a Cygnus extension used when generating position
|
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independent code for embedded systems. It represents an entry in
|
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a switch table, which is the difference between two symbols in
|
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the .text section. The symndx is actually the offset from the
|
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reloc address to the subtrahend. See include/coff/mips.h for
|
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more details. */
|
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HOWTO (MIPS_R_SWITCH, /* type */
|
||
0, /* rightshift */
|
||
2, /* size (0 = byte, 1 = short, 2 = long) */
|
||
32, /* bitsize */
|
||
true, /* pc_relative */
|
||
0, /* bitpos */
|
||
complain_overflow_dont, /* complain_on_overflow */
|
||
mips_switch_reloc, /* special_function */
|
||
"SWITCH", /* name */
|
||
true, /* partial_inplace */
|
||
0xffffffff, /* src_mask */
|
||
0xffffffff, /* dst_mask */
|
||
true) /* pcrel_offset */
|
||
};
|
||
|
||
#define MIPS_HOWTO_COUNT \
|
||
(sizeof mips_howto_table / sizeof mips_howto_table[0])
|
||
|
||
/* When the linker is doing relaxing, it may change a external PCREL16
|
||
reloc. This typically represents an instruction like
|
||
bal foo
|
||
We change it to
|
||
.set noreorder
|
||
bal $L1
|
||
lui $at,%hi(foo - $L1)
|
||
$L1:
|
||
addiu $at,%lo(foo - $L1)
|
||
addu $at,$at,$31
|
||
jalr $at
|
||
PCREL16_EXPANSION_ADJUSTMENT is the number of bytes this changes the
|
||
instruction by. */
|
||
|
||
#define PCREL16_EXPANSION_ADJUSTMENT (4 * 4)
|
||
|
||
/* See whether the magic number matches. */
|
||
|
||
static boolean
|
||
mips_ecoff_bad_format_hook (abfd, filehdr)
|
||
bfd *abfd;
|
||
PTR filehdr;
|
||
{
|
||
struct internal_filehdr *internal_f = (struct internal_filehdr *) filehdr;
|
||
|
||
switch (internal_f->f_magic)
|
||
{
|
||
case MIPS_MAGIC_1:
|
||
/* I don't know what endianness this implies. */
|
||
return true;
|
||
|
||
case MIPS_MAGIC_BIG:
|
||
case MIPS_MAGIC_BIG2:
|
||
case MIPS_MAGIC_BIG3:
|
||
return abfd->xvec->byteorder_big_p;
|
||
|
||
case MIPS_MAGIC_LITTLE:
|
||
case MIPS_MAGIC_LITTLE2:
|
||
case MIPS_MAGIC_LITTLE3:
|
||
return abfd->xvec->byteorder_big_p == false;
|
||
|
||
default:
|
||
return false;
|
||
}
|
||
}
|
||
|
||
/* Reloc handling. MIPS ECOFF relocs are packed into 8 bytes in
|
||
external form. They use a bit which indicates whether the symbol
|
||
is external. */
|
||
|
||
/* Swap a reloc in. */
|
||
|
||
static void
|
||
mips_ecoff_swap_reloc_in (abfd, ext_ptr, intern)
|
||
bfd *abfd;
|
||
PTR ext_ptr;
|
||
struct internal_reloc *intern;
|
||
{
|
||
const RELOC *ext = (RELOC *) ext_ptr;
|
||
|
||
intern->r_vaddr = bfd_h_get_32 (abfd, (bfd_byte *) ext->r_vaddr);
|
||
if (abfd->xvec->header_byteorder_big_p != false)
|
||
{
|
||
intern->r_symndx = (((int) ext->r_bits[0]
|
||
<< RELOC_BITS0_SYMNDX_SH_LEFT_BIG)
|
||
| ((int) ext->r_bits[1]
|
||
<< RELOC_BITS1_SYMNDX_SH_LEFT_BIG)
|
||
| ((int) ext->r_bits[2]
|
||
<< RELOC_BITS2_SYMNDX_SH_LEFT_BIG));
|
||
intern->r_type = ((ext->r_bits[3] & RELOC_BITS3_TYPE_BIG)
|
||
>> RELOC_BITS3_TYPE_SH_BIG);
|
||
intern->r_extern = (ext->r_bits[3] & RELOC_BITS3_EXTERN_BIG) != 0;
|
||
}
|
||
else
|
||
{
|
||
intern->r_symndx = (((int) ext->r_bits[0]
|
||
<< RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE)
|
||
| ((int) ext->r_bits[1]
|
||
<< RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE)
|
||
| ((int) ext->r_bits[2]
|
||
<< RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE));
|
||
intern->r_type = ((ext->r_bits[3] & RELOC_BITS3_TYPE_LITTLE)
|
||
>> RELOC_BITS3_TYPE_SH_LITTLE);
|
||
intern->r_extern = (ext->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) != 0;
|
||
}
|
||
|
||
/* If this is a MIPS_R_SWITCH reloc, r_symndx is actually the offset
|
||
from the reloc address to the base of the difference (see
|
||
include/coff/mips.h for more details). We copy symndx into the
|
||
r_offset field so as not to confuse ecoff_slurp_reloc_table in
|
||
ecoff.c. In adjust_reloc_in we then copy r_offset into the reloc
|
||
addend. */
|
||
if (intern->r_type == MIPS_R_SWITCH)
|
||
{
|
||
BFD_ASSERT (! intern->r_extern);
|
||
intern->r_offset = intern->r_symndx;
|
||
intern->r_symndx = RELOC_SECTION_TEXT;
|
||
}
|
||
}
|
||
|
||
/* Swap a reloc out. */
|
||
|
||
static void
|
||
mips_ecoff_swap_reloc_out (abfd, intern, dst)
|
||
bfd *abfd;
|
||
const struct internal_reloc *intern;
|
||
PTR dst;
|
||
{
|
||
RELOC *ext = (RELOC *) dst;
|
||
long r_symndx;
|
||
|
||
BFD_ASSERT (intern->r_extern
|
||
|| (intern->r_symndx >= 0 && intern->r_symndx <= 12));
|
||
|
||
/* If this is a MIPS_R_SWITCH reloc, we actually want to write the
|
||
contents of r_offset out as the symbol index. This undoes the
|
||
change made by mips_ecoff_swap_reloc_in. */
|
||
if (intern->r_type != MIPS_R_SWITCH)
|
||
r_symndx = intern->r_symndx;
|
||
else
|
||
{
|
||
BFD_ASSERT (intern->r_symndx == RELOC_SECTION_TEXT);
|
||
r_symndx = intern->r_offset;
|
||
}
|
||
|
||
bfd_h_put_32 (abfd, intern->r_vaddr, (bfd_byte *) ext->r_vaddr);
|
||
if (abfd->xvec->header_byteorder_big_p != false)
|
||
{
|
||
ext->r_bits[0] = r_symndx >> RELOC_BITS0_SYMNDX_SH_LEFT_BIG;
|
||
ext->r_bits[1] = r_symndx >> RELOC_BITS1_SYMNDX_SH_LEFT_BIG;
|
||
ext->r_bits[2] = r_symndx >> RELOC_BITS2_SYMNDX_SH_LEFT_BIG;
|
||
ext->r_bits[3] = (((intern->r_type << RELOC_BITS3_TYPE_SH_BIG)
|
||
& RELOC_BITS3_TYPE_BIG)
|
||
| (intern->r_extern ? RELOC_BITS3_EXTERN_BIG : 0));
|
||
}
|
||
else
|
||
{
|
||
ext->r_bits[0] = r_symndx >> RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE;
|
||
ext->r_bits[1] = r_symndx >> RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE;
|
||
ext->r_bits[2] = r_symndx >> RELOC_BITS2_SYMNDX_SH_LEFT_LITTLE;
|
||
ext->r_bits[3] = (((intern->r_type << RELOC_BITS3_TYPE_SH_LITTLE)
|
||
& RELOC_BITS3_TYPE_LITTLE)
|
||
| (intern->r_extern ? RELOC_BITS3_EXTERN_LITTLE : 0));
|
||
}
|
||
}
|
||
|
||
/* Finish canonicalizing a reloc. Part of this is generic to all
|
||
ECOFF targets, and that part is in ecoff.c. The rest is done in
|
||
this backend routine. It must fill in the howto field. */
|
||
|
||
static void
|
||
mips_adjust_reloc_in (abfd, intern, rptr)
|
||
bfd *abfd;
|
||
const struct internal_reloc *intern;
|
||
arelent *rptr;
|
||
{
|
||
if (intern->r_type > MIPS_R_SWITCH)
|
||
abort ();
|
||
|
||
if (! intern->r_extern
|
||
&& (intern->r_type == MIPS_R_GPREL
|
||
|| intern->r_type == MIPS_R_LITERAL))
|
||
rptr->addend += ecoff_data (abfd)->gp;
|
||
|
||
/* If the type is MIPS_R_IGNORE, make sure this is a reference to
|
||
the absolute section so that the reloc is ignored. */
|
||
if (intern->r_type == MIPS_R_IGNORE)
|
||
rptr->sym_ptr_ptr = bfd_abs_section.symbol_ptr_ptr;
|
||
|
||
/* If this is a MIPS_R_SWITCH reloc, we want the addend field of the
|
||
BFD relocto hold the value which was originally in the symndx
|
||
field of the internal MIPS ECOFF reloc. This value was copied
|
||
into intern->r_offset by mips_swap_reloc_in, and here we copy it
|
||
into the addend field. */
|
||
if (intern->r_type == MIPS_R_SWITCH)
|
||
rptr->addend = intern->r_offset;
|
||
|
||
rptr->howto = &mips_howto_table[intern->r_type];
|
||
}
|
||
|
||
/* Make any adjustments needed to a reloc before writing it out. None
|
||
are needed for MIPS. */
|
||
|
||
static void
|
||
mips_adjust_reloc_out (abfd, rel, intern)
|
||
bfd *abfd;
|
||
const arelent *rel;
|
||
struct internal_reloc *intern;
|
||
{
|
||
/* For a MIPS_R_SWITCH reloc we must copy rel->addend into
|
||
intern->r_offset. This will then be written out as the symbol
|
||
index by mips_ecoff_swap_reloc_out. This operation parallels the
|
||
action of mips_adjust_reloc_in. */
|
||
if (intern->r_type == MIPS_R_SWITCH)
|
||
intern->r_offset = rel->addend;
|
||
}
|
||
|
||
/* ECOFF relocs are either against external symbols, or against
|
||
sections. If we are producing relocateable output, and the reloc
|
||
is against an external symbol, and nothing has given us any
|
||
additional addend, the resulting reloc will also be against the
|
||
same symbol. In such a case, we don't want to change anything
|
||
about the way the reloc is handled, since it will all be done at
|
||
final link time. Rather than put special case code into
|
||
bfd_perform_relocation, all the reloc types use this howto
|
||
function. It just short circuits the reloc if producing
|
||
relocateable output against an external symbol. */
|
||
|
||
static bfd_reloc_status_type
|
||
mips_generic_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 (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;
|
||
}
|
||
|
||
return bfd_reloc_continue;
|
||
}
|
||
|
||
/* Do a REFHI relocation. This has to be done in combination with a
|
||
REFLO reloc, because there is a carry from the REFLO to the REFHI.
|
||
Here we just save the information we need; we do the actual
|
||
relocation when we see the REFLO. MIPS ECOFF requires that the
|
||
REFLO immediately follow the REFHI, so this ought to work. */
|
||
|
||
static bfd_byte *mips_refhi_addr;
|
||
static bfd_vma mips_refhi_addend;
|
||
|
||
static bfd_reloc_status_type
|
||
mips_refhi_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 ret;
|
||
bfd_vma relocation;
|
||
|
||
/* 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 (symbol->section == &bfd_und_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 REFLO do the actual relocation. */
|
||
mips_refhi_addr = (bfd_byte *) data + reloc_entry->address;
|
||
mips_refhi_addend = relocation;
|
||
|
||
if (output_bfd != (bfd *) NULL)
|
||
reloc_entry->address += input_section->output_offset;
|
||
|
||
return ret;
|
||
}
|
||
|
||
/* Do a REFLO relocation. This is a straightforward 16 bit inplace
|
||
relocation; this function exists in order to do the REFHI
|
||
relocation described above. */
|
||
|
||
static bfd_reloc_status_type
|
||
mips_reflo_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 (mips_refhi_addr != (bfd_byte *) NULL)
|
||
{
|
||
unsigned long insn;
|
||
unsigned long val;
|
||
unsigned long vallo;
|
||
|
||
/* Do the REFHI relocation. Note that we actually don't need to
|
||
know anything about the REFLO itself, except where to find
|
||
the low 16 bits of the addend needed by the REFHI. */
|
||
insn = bfd_get_32 (abfd, mips_refhi_addr);
|
||
vallo = (bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address)
|
||
& 0xffff);
|
||
val = ((insn & 0xffff) << 16) + vallo;
|
||
val += mips_refhi_addend;
|
||
|
||
/* The low order 16 bits are always treated as a signed value.
|
||
Therefore, a negative value in the low order bits requires an
|
||
adjustment in the high order bits. We need to make this
|
||
adjustment in two ways: once for the bits we took from the
|
||
data, and once for the bits we are putting back in to the
|
||
data. */
|
||
if ((vallo & 0x8000) != 0)
|
||
val -= 0x10000;
|
||
if ((val & 0x8000) != 0)
|
||
val += 0x10000;
|
||
|
||
insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff);
|
||
bfd_put_32 (abfd, insn, mips_refhi_addr);
|
||
|
||
mips_refhi_addr = (bfd_byte *) NULL;
|
||
}
|
||
|
||
/* Now do the REFLO reloc in the usual way. */
|
||
return mips_generic_reloc (abfd, reloc_entry, symbol, data,
|
||
input_section, output_bfd, error_message);
|
||
}
|
||
|
||
/* Do a GPREL relocation. This is a 16 bit value which must become
|
||
the offset from the gp register. */
|
||
|
||
static bfd_reloc_status_type
|
||
mips_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_vma relocation;
|
||
unsigned long val;
|
||
unsigned long insn;
|
||
|
||
/* 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 ECOFF
|
||
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;
|
||
}
|
||
|
||
if (symbol->section == &bfd_und_section
|
||
&& relocateable == false)
|
||
return bfd_reloc_undefined;
|
||
|
||
/* 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 ECOFF
|
||
target data. We don't need to adjust the symbol value for an
|
||
external symbol if we are producing relocateable output. */
|
||
if (ecoff_data (output_bfd)->gp == 0
|
||
&& (relocateable == false
|
||
|| (symbol->flags & BSF_SECTION_SYM) != 0))
|
||
{
|
||
if (relocateable != false)
|
||
{
|
||
/* Make up a value. */
|
||
ecoff_data (output_bfd)->gp =
|
||
symbol->section->output_section->vma + 0x4000;
|
||
}
|
||
else
|
||
{
|
||
unsigned int count;
|
||
asymbol **sym;
|
||
unsigned int i;
|
||
|
||
count = bfd_get_symcount (output_bfd);
|
||
sym = bfd_get_outsymbols (output_bfd);
|
||
|
||
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)
|
||
{
|
||
ecoff_data (output_bfd)->gp = bfd_asymbol_value (*sym);
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
if (i >= count)
|
||
{
|
||
/* Only get the error once. */
|
||
ecoff_data (output_bfd)->gp = 4;
|
||
*error_message =
|
||
(char *) "GP relative relocation when _gp not defined";
|
||
return bfd_reloc_dangerous;
|
||
}
|
||
}
|
||
}
|
||
|
||
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;
|
||
|
||
insn = bfd_get_32 (abfd, (bfd_byte *) data + reloc_entry->address);
|
||
|
||
/* Set val to the offset into the section or symbol. */
|
||
val = ((insn & 0xffff) + reloc_entry->addend) & 0xffff;
|
||
if (val & 0x8000)
|
||
val -= 0x10000;
|
||
|
||
/* 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 == false
|
||
|| (symbol->flags & BSF_SECTION_SYM) != 0)
|
||
val += relocation - ecoff_data (output_bfd)->gp;
|
||
|
||
insn = (insn &~ 0xffff) | (val & 0xffff);
|
||
bfd_put_32 (abfd, insn, (bfd_byte *) data + reloc_entry->address);
|
||
|
||
if (relocateable != false)
|
||
reloc_entry->address += input_section->output_offset;
|
||
|
||
/* Make sure it fit in 16 bits. */
|
||
if (val >= 0x8000 && val < 0xffff8000)
|
||
return bfd_reloc_overflow;
|
||
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
/* This is the special function for the MIPS_R_SWITCH reloc. This
|
||
special reloc is normally correct in the object file, and only
|
||
requires special handling when relaxing. We don't want
|
||
bfd_perform_relocation to tamper with it at all. */
|
||
|
||
/*ARGSUSED*/
|
||
static bfd_reloc_status_type
|
||
mips_switch_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;
|
||
{
|
||
return bfd_reloc_ok;
|
||
}
|
||
|
||
/* Get the howto structure for a generic reloc type. */
|
||
|
||
static CONST struct reloc_howto_struct *
|
||
mips_bfd_reloc_type_lookup (abfd, code)
|
||
bfd *abfd;
|
||
bfd_reloc_code_real_type code;
|
||
{
|
||
int mips_type;
|
||
|
||
switch (code)
|
||
{
|
||
case BFD_RELOC_16:
|
||
mips_type = MIPS_R_REFHALF;
|
||
break;
|
||
case BFD_RELOC_32:
|
||
case BFD_RELOC_CTOR:
|
||
mips_type = MIPS_R_REFWORD;
|
||
break;
|
||
case BFD_RELOC_MIPS_JMP:
|
||
mips_type = MIPS_R_JMPADDR;
|
||
break;
|
||
case BFD_RELOC_HI16_S:
|
||
mips_type = MIPS_R_REFHI;
|
||
break;
|
||
case BFD_RELOC_LO16:
|
||
mips_type = MIPS_R_REFLO;
|
||
break;
|
||
case BFD_RELOC_MIPS_GPREL:
|
||
mips_type = MIPS_R_GPREL;
|
||
break;
|
||
case BFD_RELOC_MIPS_LITERAL:
|
||
mips_type = MIPS_R_LITERAL;
|
||
break;
|
||
case BFD_RELOC_16_PCREL_S2:
|
||
mips_type = MIPS_R_PCREL16;
|
||
break;
|
||
case BFD_RELOC_GPREL32:
|
||
mips_type = MIPS_R_SWITCH;
|
||
break;
|
||
default:
|
||
return (CONST struct reloc_howto_struct *) NULL;
|
||
}
|
||
|
||
return &mips_howto_table[mips_type];
|
||
}
|
||
|
||
/* A helper routine for mips_relocate_section which handles the REFHI
|
||
relocation. The REFHI relocation must be followed by a REFLO
|
||
relocation, and the addend used is formed from the addends of both
|
||
instructions. */
|
||
|
||
static void
|
||
mips_relocate_refhi (refhi, reflo, input_bfd, input_section, contents,
|
||
adjust, relocation)
|
||
struct internal_reloc *refhi;
|
||
struct internal_reloc *reflo;
|
||
bfd *input_bfd;
|
||
asection *input_section;
|
||
bfd_byte *contents;
|
||
size_t adjust;
|
||
bfd_vma relocation;
|
||
{
|
||
unsigned long insn;
|
||
unsigned long val;
|
||
unsigned long vallo;
|
||
|
||
insn = bfd_get_32 (input_bfd,
|
||
contents + adjust + refhi->r_vaddr - input_section->vma);
|
||
vallo = (bfd_get_32 (input_bfd,
|
||
contents + adjust + reflo->r_vaddr - input_section->vma)
|
||
& 0xffff);
|
||
val = ((insn & 0xffff) << 16) + vallo;
|
||
val += relocation;
|
||
|
||
/* The low order 16 bits are always treated as a signed value.
|
||
Therefore, a negative value in the low order bits requires an
|
||
adjustment in the high order bits. We need to make this
|
||
adjustment in two ways: once for the bits we took from the data,
|
||
and once for the bits we are putting back in to the data. */
|
||
if ((vallo & 0x8000) != 0)
|
||
val -= 0x10000;
|
||
if ((val & 0x8000) != 0)
|
||
val += 0x10000;
|
||
|
||
insn = (insn &~ 0xffff) | ((val >> 16) & 0xffff);
|
||
bfd_put_32 (input_bfd, (bfd_vma) insn,
|
||
contents + adjust + refhi->r_vaddr - input_section->vma);
|
||
}
|
||
|
||
/* Relocate a section while linking a MIPS ECOFF file. */
|
||
|
||
static boolean
|
||
mips_relocate_section (output_bfd, info, input_bfd, input_section,
|
||
contents, external_relocs)
|
||
bfd *output_bfd;
|
||
struct bfd_link_info *info;
|
||
bfd *input_bfd;
|
||
asection *input_section;
|
||
bfd_byte *contents;
|
||
PTR external_relocs;
|
||
{
|
||
asection **symndx_to_section;
|
||
struct ecoff_link_hash_entry **sym_hashes;
|
||
bfd_vma gp;
|
||
boolean gp_undefined;
|
||
size_t adjust;
|
||
long *offsets;
|
||
struct external_reloc *ext_rel;
|
||
struct external_reloc *ext_rel_end;
|
||
unsigned int i;
|
||
boolean got_reflo;
|
||
struct internal_reloc reflo_int_rel;
|
||
|
||
BFD_ASSERT (input_bfd->xvec->header_byteorder_big_p
|
||
== output_bfd->xvec->header_byteorder_big_p);
|
||
|
||
/* We keep a table mapping the symndx found in an internal reloc to
|
||
the appropriate section. This is faster than looking up the
|
||
section by name each time. */
|
||
symndx_to_section = ecoff_data (input_bfd)->symndx_to_section;
|
||
if (symndx_to_section == (asection **) NULL)
|
||
{
|
||
symndx_to_section = ((asection **)
|
||
bfd_alloc (input_bfd,
|
||
(NUM_RELOC_SECTIONS
|
||
* sizeof (asection *))));
|
||
if (!symndx_to_section)
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
return false;
|
||
}
|
||
|
||
symndx_to_section[RELOC_SECTION_NONE] = NULL;
|
||
symndx_to_section[RELOC_SECTION_TEXT] =
|
||
bfd_get_section_by_name (input_bfd, ".text");
|
||
symndx_to_section[RELOC_SECTION_RDATA] =
|
||
bfd_get_section_by_name (input_bfd, ".rdata");
|
||
symndx_to_section[RELOC_SECTION_DATA] =
|
||
bfd_get_section_by_name (input_bfd, ".data");
|
||
symndx_to_section[RELOC_SECTION_SDATA] =
|
||
bfd_get_section_by_name (input_bfd, ".sdata");
|
||
symndx_to_section[RELOC_SECTION_SBSS] =
|
||
bfd_get_section_by_name (input_bfd, ".sbss");
|
||
symndx_to_section[RELOC_SECTION_BSS] =
|
||
bfd_get_section_by_name (input_bfd, ".bss");
|
||
symndx_to_section[RELOC_SECTION_INIT] =
|
||
bfd_get_section_by_name (input_bfd, ".init");
|
||
symndx_to_section[RELOC_SECTION_LIT8] =
|
||
bfd_get_section_by_name (input_bfd, ".lit8");
|
||
symndx_to_section[RELOC_SECTION_LIT4] =
|
||
bfd_get_section_by_name (input_bfd, ".lit4");
|
||
symndx_to_section[RELOC_SECTION_XDATA] = NULL;
|
||
symndx_to_section[RELOC_SECTION_PDATA] = NULL;
|
||
symndx_to_section[RELOC_SECTION_FINI] =
|
||
bfd_get_section_by_name (input_bfd, ".fini");
|
||
symndx_to_section[RELOC_SECTION_LITA] = NULL;
|
||
symndx_to_section[RELOC_SECTION_ABS] = NULL;
|
||
|
||
ecoff_data (input_bfd)->symndx_to_section = symndx_to_section;
|
||
}
|
||
|
||
sym_hashes = ecoff_data (input_bfd)->sym_hashes;
|
||
|
||
gp = ecoff_data (output_bfd)->gp;
|
||
if (gp == 0)
|
||
gp_undefined = true;
|
||
else
|
||
gp_undefined = false;
|
||
|
||
got_reflo = false;
|
||
|
||
adjust = 0;
|
||
|
||
if (ecoff_section_data (input_bfd, input_section) == NULL)
|
||
offsets = NULL;
|
||
else
|
||
offsets = ecoff_section_data (input_bfd, input_section)->offsets;
|
||
|
||
ext_rel = (struct external_reloc *) external_relocs;
|
||
ext_rel_end = ext_rel + input_section->reloc_count;
|
||
for (i = 0; ext_rel < ext_rel_end; ext_rel++, i++)
|
||
{
|
||
struct internal_reloc int_rel;
|
||
bfd_vma addend;
|
||
reloc_howto_type *howto;
|
||
struct ecoff_link_hash_entry *h = NULL;
|
||
asection *s = NULL;
|
||
bfd_vma relocation;
|
||
bfd_reloc_status_type r;
|
||
|
||
if (! got_reflo)
|
||
mips_ecoff_swap_reloc_in (input_bfd, (PTR) ext_rel, &int_rel);
|
||
else
|
||
{
|
||
int_rel = reflo_int_rel;
|
||
got_reflo = false;
|
||
}
|
||
|
||
BFD_ASSERT (int_rel.r_type
|
||
< sizeof mips_howto_table / sizeof mips_howto_table[0]);
|
||
|
||
/* The REFHI reloc requires special handling. It must be
|
||
followed by a REFLO reloc, and the addend is formed from both
|
||
fields. */
|
||
if (int_rel.r_type == MIPS_R_REFHI)
|
||
{
|
||
BFD_ASSERT ((ext_rel + 1) < ext_rel_end);
|
||
mips_ecoff_swap_reloc_in (input_bfd, (PTR) (ext_rel + 1),
|
||
&reflo_int_rel);
|
||
BFD_ASSERT (reflo_int_rel.r_type == MIPS_R_REFLO
|
||
&& int_rel.r_extern == reflo_int_rel.r_extern
|
||
&& int_rel.r_symndx == reflo_int_rel.r_symndx);
|
||
got_reflo = true;
|
||
}
|
||
|
||
howto = &mips_howto_table[int_rel.r_type];
|
||
|
||
/* The SWITCH reloc must be handled specially. This reloc is
|
||
marks the location of a difference between two portions of an
|
||
object file. The symbol index does not reference a symbol,
|
||
but is actually the offset from the reloc to the subtrahend
|
||
of the difference. This reloc is correct in the object file,
|
||
and needs no further adjustment, unless we are relaxing. If
|
||
we are relaxing, we may have to add in an offset. Since no
|
||
symbols are involved in this reloc, we handle it completely
|
||
here. */
|
||
if (int_rel.r_type == MIPS_R_SWITCH)
|
||
{
|
||
if (offsets != NULL
|
||
&& offsets[i] != 0)
|
||
{
|
||
r = _bfd_relocate_contents (howto, input_bfd,
|
||
(bfd_vma) offsets[i],
|
||
(contents
|
||
+ adjust
|
||
+ int_rel.r_vaddr
|
||
- input_section->vma));
|
||
BFD_ASSERT (r == bfd_reloc_ok);
|
||
}
|
||
|
||
continue;
|
||
}
|
||
|
||
if (int_rel.r_extern)
|
||
{
|
||
h = sym_hashes[int_rel.r_symndx];
|
||
/* If h is NULL, that means that there is a reloc against an
|
||
external symbol which we thought was just a debugging
|
||
symbol. This should not happen. */
|
||
if (h == (struct ecoff_link_hash_entry *) NULL)
|
||
abort ();
|
||
}
|
||
else
|
||
{
|
||
if (int_rel.r_symndx < 0 || int_rel.r_symndx >= NUM_RELOC_SECTIONS)
|
||
s = NULL;
|
||
else
|
||
s = symndx_to_section[int_rel.r_symndx];
|
||
|
||
if (s == (asection *) NULL)
|
||
abort ();
|
||
}
|
||
|
||
/* The GPREL reloc uses an addend: the difference in the GP
|
||
values. */
|
||
if (int_rel.r_type != MIPS_R_GPREL
|
||
&& int_rel.r_type != MIPS_R_LITERAL)
|
||
addend = 0;
|
||
else
|
||
{
|
||
if (gp_undefined)
|
||
{
|
||
if (! ((*info->callbacks->reloc_dangerous)
|
||
(info, "GP relative relocation when GP not defined",
|
||
input_bfd, input_section,
|
||
int_rel.r_vaddr - input_section->vma)))
|
||
return false;
|
||
/* Only give the error once per link. */
|
||
ecoff_data (output_bfd)->gp = gp = 4;
|
||
gp_undefined = false;
|
||
}
|
||
if (! int_rel.r_extern)
|
||
{
|
||
/* This is a relocation against a section. The current
|
||
addend in the instruction is the difference between
|
||
INPUT_SECTION->vma and the GP value of INPUT_BFD. We
|
||
must change this to be the difference between the
|
||
final definition (which will end up in RELOCATION)
|
||
and the GP value of OUTPUT_BFD (which is in GP). */
|
||
addend = ecoff_data (input_bfd)->gp - gp;
|
||
}
|
||
else if (! info->relocateable
|
||
|| h->root.type == bfd_link_hash_defined)
|
||
{
|
||
/* This is a relocation against an undefined or common
|
||
symbol. The current addend in the instruction is
|
||
simply the desired offset into the symbol (normally
|
||
zero). We are going to change this into a relocation
|
||
against a defined symbol, so we want the instruction
|
||
to hold the difference between the final definition
|
||
of the symbol (which will end up in RELOCATION) and
|
||
the GP value of OUTPUT_BFD (which is in GP). */
|
||
addend = - gp;
|
||
}
|
||
else
|
||
{
|
||
/* This is a relocation against an undefined or common
|
||
symbol. The current addend in the instruction is
|
||
simply the desired offset into the symbol (normally
|
||
zero). We are generating relocateable output, and we
|
||
aren't going to define this symbol, so we just leave
|
||
the instruction alone. */
|
||
addend = 0;
|
||
}
|
||
}
|
||
|
||
/* If we are relaxing, mips_relax_section may have set
|
||
offsets[i] to some value. A value of 1 means we must expand
|
||
a PC relative branch into a multi-instruction of sequence,
|
||
and any other value is an addend. */
|
||
if (offsets != NULL
|
||
&& offsets[i] != 0)
|
||
{
|
||
BFD_ASSERT (! info->relocateable);
|
||
BFD_ASSERT (int_rel.r_type == MIPS_R_PCREL16);
|
||
if (offsets[i] != 1)
|
||
{
|
||
BFD_ASSERT (! int_rel.r_extern);
|
||
addend += offsets[i];
|
||
}
|
||
else
|
||
{
|
||
bfd_byte *here;
|
||
|
||
BFD_ASSERT (int_rel.r_extern);
|
||
|
||
/* Move the rest of the instructions up. */
|
||
here = (contents
|
||
+ adjust
|
||
+ int_rel.r_vaddr
|
||
- input_section->vma);
|
||
memmove (here + PCREL16_EXPANSION_ADJUSTMENT, here,
|
||
(input_section->_raw_size
|
||
- (int_rel.r_vaddr - input_section->vma)));
|
||
|
||
/* Generate the new instructions. */
|
||
if (! mips_relax_pcrel16 (info, input_bfd, input_section,
|
||
h, here,
|
||
(input_section->output_section->vma
|
||
+ input_section->output_offset
|
||
+ (int_rel.r_vaddr
|
||
- input_section->vma)
|
||
+ adjust)))
|
||
return false;
|
||
|
||
/* We must adjust everything else up a notch. */
|
||
adjust += PCREL16_EXPANSION_ADJUSTMENT;
|
||
|
||
/* mips_relax_pcrel16 handles all the details of this
|
||
relocation. */
|
||
continue;
|
||
}
|
||
}
|
||
|
||
if (info->relocateable)
|
||
{
|
||
/* We are generating relocateable output, and must convert
|
||
the existing reloc. */
|
||
if (int_rel.r_extern)
|
||
{
|
||
if (h->root.type == bfd_link_hash_defined)
|
||
{
|
||
const char *name;
|
||
|
||
/* This symbol is defined in the output. Convert
|
||
the reloc from being against the symbol to being
|
||
against the section. */
|
||
|
||
/* Clear the r_extern bit. */
|
||
int_rel.r_extern = 0;
|
||
|
||
/* Compute a new r_symndx value. */
|
||
s = h->root.u.def.section;
|
||
name = bfd_get_section_name (output_bfd,
|
||
s->output_section);
|
||
|
||
int_rel.r_symndx = -1;
|
||
switch (name[1])
|
||
{
|
||
case 'b':
|
||
if (strcmp (name, ".bss") == 0)
|
||
int_rel.r_symndx = RELOC_SECTION_BSS;
|
||
break;
|
||
case 'd':
|
||
if (strcmp (name, ".data") == 0)
|
||
int_rel.r_symndx = RELOC_SECTION_DATA;
|
||
break;
|
||
case 'f':
|
||
if (strcmp (name, ".fini") == 0)
|
||
int_rel.r_symndx = RELOC_SECTION_FINI;
|
||
break;
|
||
case 'i':
|
||
if (strcmp (name, ".init") == 0)
|
||
int_rel.r_symndx = RELOC_SECTION_INIT;
|
||
break;
|
||
case 'l':
|
||
if (strcmp (name, ".lit8") == 0)
|
||
int_rel.r_symndx = RELOC_SECTION_LIT8;
|
||
else if (strcmp (name, ".lit4") == 0)
|
||
int_rel.r_symndx = RELOC_SECTION_LIT4;
|
||
break;
|
||
case 'r':
|
||
if (strcmp (name, ".rdata") == 0)
|
||
int_rel.r_symndx = RELOC_SECTION_RDATA;
|
||
break;
|
||
case 's':
|
||
if (strcmp (name, ".sdata") == 0)
|
||
int_rel.r_symndx = RELOC_SECTION_SDATA;
|
||
else if (strcmp (name, ".sbss") == 0)
|
||
int_rel.r_symndx = RELOC_SECTION_SBSS;
|
||
break;
|
||
case 't':
|
||
if (strcmp (name, ".text") == 0)
|
||
int_rel.r_symndx = RELOC_SECTION_TEXT;
|
||
break;
|
||
}
|
||
|
||
if (int_rel.r_symndx == -1)
|
||
abort ();
|
||
|
||
/* Add the section VMA and the symbol value. */
|
||
relocation = (h->root.u.def.value
|
||
+ s->output_section->vma
|
||
+ s->output_offset);
|
||
|
||
/* For a PC relative relocation, the object file
|
||
currently holds just the addend. We must adjust
|
||
by the address to get the right value. */
|
||
if (howto->pc_relative)
|
||
relocation -= int_rel.r_vaddr - input_section->vma;
|
||
|
||
h = NULL;
|
||
}
|
||
else
|
||
{
|
||
/* Change the symndx value to the right one for the
|
||
output BFD. */
|
||
int_rel.r_symndx = h->indx;
|
||
if (int_rel.r_symndx == -1)
|
||
{
|
||
/* This symbol is not being written out. */
|
||
if (! ((*info->callbacks->unattached_reloc)
|
||
(info, h->root.root.string, input_bfd,
|
||
input_section,
|
||
int_rel.r_vaddr - input_section->vma)))
|
||
return false;
|
||
int_rel.r_symndx = 0;
|
||
}
|
||
relocation = 0;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* This is a relocation against a section. Adjust the
|
||
value by the amount the section moved. */
|
||
relocation = (s->output_section->vma
|
||
+ s->output_offset
|
||
- s->vma);
|
||
}
|
||
|
||
relocation += addend;
|
||
|
||
/* Adjust a PC relative relocation by removing the reference
|
||
to the original address in the section and including the
|
||
reference to the new address. */
|
||
if (howto->pc_relative)
|
||
relocation -= (input_section->output_section->vma
|
||
+ input_section->output_offset
|
||
- input_section->vma);
|
||
|
||
/* Adjust the contents. */
|
||
if (relocation == 0)
|
||
r = bfd_reloc_ok;
|
||
else
|
||
{
|
||
if (int_rel.r_type != MIPS_R_REFHI)
|
||
r = _bfd_relocate_contents (howto, input_bfd, relocation,
|
||
(contents
|
||
+ adjust
|
||
+ int_rel.r_vaddr
|
||
- input_section->vma));
|
||
else
|
||
{
|
||
mips_relocate_refhi (&int_rel, &reflo_int_rel,
|
||
input_bfd, input_section, contents,
|
||
adjust, relocation);
|
||
r = bfd_reloc_ok;
|
||
}
|
||
}
|
||
|
||
/* Adjust the reloc address. */
|
||
int_rel.r_vaddr += (input_section->output_section->vma
|
||
+ input_section->output_offset
|
||
- input_section->vma);
|
||
|
||
/* Save the changed reloc information. */
|
||
mips_ecoff_swap_reloc_out (input_bfd, &int_rel, (PTR) ext_rel);
|
||
}
|
||
else
|
||
{
|
||
/* We are producing a final executable. */
|
||
if (int_rel.r_extern)
|
||
{
|
||
/* This is a reloc against a symbol. */
|
||
if (h->root.type == bfd_link_hash_defined)
|
||
{
|
||
asection *hsec;
|
||
|
||
hsec = h->root.u.def.section;
|
||
relocation = (h->root.u.def.value
|
||
+ hsec->output_section->vma
|
||
+ hsec->output_offset);
|
||
}
|
||
else
|
||
{
|
||
if (! ((*info->callbacks->undefined_symbol)
|
||
(info, h->root.root.string, input_bfd,
|
||
input_section,
|
||
int_rel.r_vaddr - input_section->vma)))
|
||
return false;
|
||
relocation = 0;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
/* This is a reloc against a section. */
|
||
relocation = (s->output_section->vma
|
||
+ s->output_offset
|
||
- s->vma);
|
||
|
||
/* A PC relative reloc is already correct in the object
|
||
file. Make it look like a pcrel_offset relocation by
|
||
adding in the start address. */
|
||
if (howto->pc_relative)
|
||
relocation += int_rel.r_vaddr + adjust;
|
||
}
|
||
|
||
if (int_rel.r_type != MIPS_R_REFHI)
|
||
r = _bfd_final_link_relocate (howto,
|
||
input_bfd,
|
||
input_section,
|
||
contents,
|
||
(int_rel.r_vaddr
|
||
- input_section->vma
|
||
+ adjust),
|
||
relocation,
|
||
addend);
|
||
else
|
||
{
|
||
mips_relocate_refhi (&int_rel, &reflo_int_rel, input_bfd,
|
||
input_section, contents, adjust,
|
||
relocation);
|
||
r = bfd_reloc_ok;
|
||
}
|
||
}
|
||
|
||
if (r != bfd_reloc_ok)
|
||
{
|
||
switch (r)
|
||
{
|
||
default:
|
||
case bfd_reloc_outofrange:
|
||
abort ();
|
||
case bfd_reloc_overflow:
|
||
{
|
||
const char *name;
|
||
|
||
if (int_rel.r_extern)
|
||
name = h->root.root.string;
|
||
else
|
||
name = bfd_section_name (input_bfd, s);
|
||
if (! ((*info->callbacks->reloc_overflow)
|
||
(info, name, howto->name, (bfd_vma) 0,
|
||
input_bfd, input_section,
|
||
int_rel.r_vaddr - input_section->vma)))
|
||
return false;
|
||
}
|
||
break;
|
||
}
|
||
}
|
||
}
|
||
|
||
return true;
|
||
}
|
||
|
||
/* Relax a section when linking a MIPS ECOFF file. This is used for
|
||
embedded PIC code, which always uses PC relative branches which
|
||
only have an 18 bit range on MIPS. If a branch is not in range, we
|
||
generate a long instruction sequence to compensate. Each time we
|
||
find a branch to expand, we have to check all the others again to
|
||
make sure they are still in range. This is slow, but it only has
|
||
to be done when -relax is passed to the linker.
|
||
|
||
This routine figures out which branches need to expand; the actual
|
||
expansion is done in mips_relocate_section when the section
|
||
contents are relocated. The information is stored in the offsets
|
||
field of the ecoff_section_tdata structure. An offset of 1 means
|
||
that the branch must be expanded into a multi-instruction PC
|
||
relative branch (such an offset will only occur for a PC relative
|
||
branch to an external symbol). Any other offset must be a multiple
|
||
of four, and is the amount to change the branch by (such an offset
|
||
will only occur for a PC relative branch within the same section).
|
||
|
||
We do not modify the section relocs or contents themselves so that
|
||
if memory usage becomes an issue we can discard them and read them
|
||
again. The only information we must save in memory between this
|
||
routine and the mips_relocate_section routine is the table of
|
||
offsets. */
|
||
|
||
static boolean
|
||
mips_relax_section (abfd, sec, info, again)
|
||
bfd *abfd;
|
||
asection *sec;
|
||
struct bfd_link_info *info;
|
||
boolean *again;
|
||
{
|
||
struct ecoff_section_tdata *section_tdata;
|
||
bfd_byte *contents = NULL;
|
||
long *offsets;
|
||
struct external_reloc *ext_rel;
|
||
struct external_reloc *ext_rel_end;
|
||
unsigned int i;
|
||
|
||
/* Assume we are not going to need another pass. */
|
||
*again = false;
|
||
|
||
/* If we are not generating an ECOFF file, this is much too
|
||
confusing to deal with. */
|
||
if (info->hash->creator->flavour != bfd_get_flavour (abfd))
|
||
return true;
|
||
|
||
/* If there are no relocs, there is nothing to do. */
|
||
if (sec->reloc_count == 0)
|
||
return true;
|
||
|
||
/* We are only interested in PC relative relocs, and why would there
|
||
ever be one from anything but the .text section? */
|
||
if (strcmp (bfd_get_section_name (abfd, sec), ".text") != 0)
|
||
return true;
|
||
|
||
/* Read in the relocs, if we haven't already got them. */
|
||
section_tdata = ecoff_section_data (abfd, sec);
|
||
if (section_tdata == (struct ecoff_section_tdata *) NULL)
|
||
{
|
||
bfd_size_type external_reloc_size;
|
||
bfd_size_type external_relocs_size;
|
||
|
||
sec->used_by_bfd =
|
||
(PTR) bfd_alloc_by_size_t (abfd, sizeof (struct ecoff_section_tdata));
|
||
if (sec->used_by_bfd == NULL)
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
goto error_return;
|
||
}
|
||
|
||
section_tdata = ecoff_section_data (abfd, sec);
|
||
section_tdata->contents = NULL;
|
||
section_tdata->offsets = NULL;
|
||
|
||
external_reloc_size = ecoff_backend (abfd)->external_reloc_size;
|
||
external_relocs_size = external_reloc_size * sec->reloc_count;
|
||
|
||
section_tdata->external_relocs =
|
||
(PTR) bfd_alloc (abfd, external_relocs_size);
|
||
if (section_tdata->external_relocs == NULL && external_relocs_size != 0)
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
goto error_return;
|
||
}
|
||
|
||
if (bfd_seek (abfd, sec->rel_filepos, SEEK_SET) != 0
|
||
|| (bfd_read (section_tdata->external_relocs, 1,
|
||
external_relocs_size, abfd)
|
||
!= external_relocs_size))
|
||
goto error_return;
|
||
|
||
/* We must initialize _cooked_size only the first time we are
|
||
called. */
|
||
sec->_cooked_size = sec->_raw_size;
|
||
}
|
||
|
||
contents = section_tdata->contents;
|
||
offsets = section_tdata->offsets;
|
||
|
||
/* Look for any external PC relative relocs. Internal PC relative
|
||
relocs are already correct in the object file, so they certainly
|
||
can not overflow. */
|
||
ext_rel = (struct external_reloc *) section_tdata->external_relocs;
|
||
ext_rel_end = ext_rel + sec->reloc_count;
|
||
for (i = 0; ext_rel < ext_rel_end; ext_rel++, i++)
|
||
{
|
||
struct internal_reloc int_rel;
|
||
struct ecoff_link_hash_entry *h;
|
||
asection *hsec;
|
||
bfd_signed_vma relocation;
|
||
struct external_reloc *adj_ext_rel;
|
||
unsigned int adj_i;
|
||
unsigned long ext_count;
|
||
struct ecoff_link_hash_entry **adj_h_ptr;
|
||
struct ecoff_link_hash_entry **adj_h_ptr_end;
|
||
struct ecoff_value_adjust *adjust;
|
||
|
||
/* If we have already expanded this reloc, we certainly don't
|
||
need to do it again. */
|
||
if (offsets != (long *) NULL && offsets[i] == 1)
|
||
continue;
|
||
|
||
/* Quickly check that this reloc is external PCREL16. */
|
||
if (abfd->xvec->header_byteorder_big_p)
|
||
{
|
||
if ((ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_BIG) == 0
|
||
|| (((ext_rel->r_bits[3] & RELOC_BITS3_TYPE_BIG)
|
||
>> RELOC_BITS3_TYPE_SH_BIG)
|
||
!= MIPS_R_PCREL16))
|
||
continue;
|
||
}
|
||
else
|
||
{
|
||
if ((ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) == 0
|
||
|| (((ext_rel->r_bits[3] & RELOC_BITS3_TYPE_LITTLE)
|
||
>> RELOC_BITS3_TYPE_SH_LITTLE)
|
||
!= MIPS_R_PCREL16))
|
||
continue;
|
||
}
|
||
|
||
mips_ecoff_swap_reloc_in (abfd, (PTR) ext_rel, &int_rel);
|
||
|
||
h = ecoff_data (abfd)->sym_hashes[int_rel.r_symndx];
|
||
if (h == (struct ecoff_link_hash_entry *) NULL)
|
||
abort ();
|
||
|
||
if (h->root.type != bfd_link_hash_defined)
|
||
{
|
||
/* Just ignore undefined symbols. These will presumably
|
||
generate an error later in the link. */
|
||
continue;
|
||
}
|
||
|
||
/* Get the value of the symbol. */
|
||
hsec = h->root.u.def.section;
|
||
relocation = (h->root.u.def.value
|
||
+ hsec->output_section->vma
|
||
+ hsec->output_offset);
|
||
|
||
/* Subtract out the current address. */
|
||
relocation -= (sec->output_section->vma
|
||
+ sec->output_offset
|
||
+ (int_rel.r_vaddr - sec->vma));
|
||
|
||
/* The addend is stored in the object file. In the normal case
|
||
of ``bal symbol'', the addend will be -4. It will only be
|
||
different in the case of ``bal symbol+constant''. To avoid
|
||
always reading in the section contents, we don't check the
|
||
addend in the object file (we could easily check the contents
|
||
if we happen to have already read them in, but I fear that
|
||
this could be confusing). This means we will screw up if
|
||
there is a branch to a symbol that is in range, but added to
|
||
a constant which puts it out of range; in such a case the
|
||
link will fail with a reloc overflow error. Since the
|
||
compiler will never generate such code, it should be easy
|
||
enough to work around it by changing the assembly code in the
|
||
source file. */
|
||
relocation -= 4;
|
||
|
||
/* Now RELOCATION is the number we want to put in the object
|
||
file. See whether it fits. */
|
||
if (relocation >= -0x20000 && relocation < 0x20000)
|
||
continue;
|
||
|
||
/* Now that we know this reloc needs work, which will rarely
|
||
happen, go ahead and grab the section contents. */
|
||
if (contents == (bfd_byte *) NULL)
|
||
{
|
||
if (info->keep_memory)
|
||
contents = (bfd_byte *) bfd_alloc (abfd, sec->_raw_size);
|
||
else
|
||
contents = (bfd_byte *) malloc (sec->_raw_size);
|
||
if (contents == (bfd_byte *) NULL)
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
goto error_return;
|
||
}
|
||
if (! bfd_get_section_contents (abfd, sec, (PTR) contents,
|
||
(file_ptr) 0, sec->_raw_size))
|
||
goto error_return;
|
||
if (info->keep_memory)
|
||
section_tdata->contents = contents;
|
||
}
|
||
|
||
/* We only support changing the bal instruction. It would be
|
||
possible to handle other PC relative branches, but some of
|
||
them (the conditional branches) would require a different
|
||
length instruction sequence which would complicate both this
|
||
routine and mips_relax_pcrel16. It could be written if
|
||
somebody felt it were important. Ignoring this reloc will
|
||
presumably cause a reloc overflow error later on. */
|
||
if (bfd_get_32 (abfd, contents + int_rel.r_vaddr - sec->vma)
|
||
!= 0x0411ffff) /* bgezal $0,. == bal . */
|
||
continue;
|
||
|
||
/* Bother. We need to expand this reloc, and we will need to
|
||
make another relaxation pass since this change may put other
|
||
relocs out of range. We need to examine the local branches
|
||
and we need to allocate memory to hold the offsets we must
|
||
add to them. We also need to adjust the values of all
|
||
symbols in the object file following this location. */
|
||
|
||
sec->_cooked_size += PCREL16_EXPANSION_ADJUSTMENT;
|
||
*again = true;
|
||
|
||
if (offsets == (long *) NULL)
|
||
{
|
||
size_t size;
|
||
|
||
size = sec->reloc_count * sizeof (long);
|
||
offsets = (long *) bfd_alloc_by_size_t (abfd, size);
|
||
if (offsets == (long *) NULL)
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
goto error_return;
|
||
}
|
||
memset (offsets, 0, size);
|
||
section_tdata->offsets = offsets;
|
||
}
|
||
|
||
offsets[i] = 1;
|
||
|
||
/* Now look for all PC relative branches or switch table entries
|
||
that cross this reloc and adjust their offsets. We will turn
|
||
the single branch instruction into a four instruction
|
||
sequence. In this loop we are only interested in local PC
|
||
relative branches. */
|
||
adj_ext_rel = (struct external_reloc *) section_tdata->external_relocs;
|
||
for (adj_i = 0; adj_ext_rel < ext_rel_end; adj_ext_rel++, adj_i++)
|
||
{
|
||
int r_type;
|
||
struct internal_reloc adj_int_rel;
|
||
|
||
/* Quickly check that this reloc is internal PCREL16 or
|
||
SWITCH. */
|
||
if (abfd->xvec->header_byteorder_big_p)
|
||
{
|
||
if ((adj_ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_BIG) != 0)
|
||
continue;
|
||
r_type = ((adj_ext_rel->r_bits[3] & RELOC_BITS3_TYPE_BIG)
|
||
>> RELOC_BITS3_TYPE_SH_BIG);
|
||
if (r_type != MIPS_R_PCREL16
|
||
&& r_type != MIPS_R_SWITCH)
|
||
continue;
|
||
}
|
||
else
|
||
{
|
||
if ((adj_ext_rel->r_bits[3] & RELOC_BITS3_EXTERN_LITTLE) != 0)
|
||
continue;
|
||
r_type = ((adj_ext_rel->r_bits[3] & RELOC_BITS3_TYPE_LITTLE)
|
||
>> RELOC_BITS3_TYPE_SH_LITTLE);
|
||
if (r_type != MIPS_R_PCREL16
|
||
&& r_type != MIPS_R_SWITCH)
|
||
continue;
|
||
}
|
||
|
||
mips_ecoff_swap_reloc_in (abfd, (PTR) adj_ext_rel, &adj_int_rel);
|
||
|
||
if (r_type == MIPS_R_PCREL16)
|
||
{
|
||
unsigned long insn;
|
||
bfd_vma dst;
|
||
|
||
/* We are only interested in a PC relative reloc within
|
||
this section. FIXME: Cross section PC relative
|
||
relocs may not be handled correctly; does anybody
|
||
care? */
|
||
if (adj_int_rel.r_symndx != RELOC_SECTION_TEXT)
|
||
continue;
|
||
|
||
/* Fetch the branch instruction. */
|
||
insn = bfd_get_32 (abfd,
|
||
contents + adj_int_rel.r_vaddr - sec->vma);
|
||
|
||
/* Work out the destination address. */
|
||
dst = (insn & 0xffff) << 2;
|
||
if ((dst & 0x20000) != 0)
|
||
dst -= 0x40000;
|
||
dst += adj_int_rel.r_vaddr + 4;
|
||
|
||
/* If this branch crosses the branch we just decided to
|
||
expand, adjust the offset appropriately. */
|
||
if (adj_int_rel.r_vaddr <= int_rel.r_vaddr
|
||
&& dst > int_rel.r_vaddr)
|
||
offsets[adj_i] += PCREL16_EXPANSION_ADJUSTMENT;
|
||
else if (adj_int_rel.r_vaddr > int_rel.r_vaddr
|
||
&& dst <= int_rel.r_vaddr)
|
||
offsets[adj_i] -= PCREL16_EXPANSION_ADJUSTMENT;
|
||
}
|
||
else
|
||
{
|
||
bfd_vma start, stop;
|
||
|
||
/* A MIPS_R_SWITCH reloc represents a word of the form
|
||
.word $L3-$LS12
|
||
The value in the object file is correct, assuming the
|
||
original value of $L3. The symndx value is actually
|
||
the difference between the reloc address and $LS12.
|
||
This lets us compute the original value of $LS12 as
|
||
vaddr - symndx
|
||
and the original value of $L3 as
|
||
vaddr - symndx + addend
|
||
where addend is the value from the object file. At
|
||
this point, the symndx value is actually found in the
|
||
r_offset field, since it was moved by
|
||
mips_ecoff_swap_reloc_in. */
|
||
|
||
start = adj_int_rel.r_vaddr - adj_int_rel.r_offset;
|
||
stop = start + bfd_get_32 (abfd,
|
||
(contents
|
||
+ adj_int_rel.r_vaddr
|
||
- sec->vma));
|
||
|
||
/* The value we want in the object file is stop - start.
|
||
If the expanded branch lies between start and stop,
|
||
we must adjust the offset. */
|
||
if (start <= int_rel.r_vaddr && stop > int_rel.r_vaddr)
|
||
offsets[adj_i] += PCREL16_EXPANSION_ADJUSTMENT;
|
||
else if (start > int_rel.r_vaddr && stop <= int_rel.r_vaddr)
|
||
offsets[adj_i] -= PCREL16_EXPANSION_ADJUSTMENT;
|
||
}
|
||
}
|
||
|
||
/* Find all symbols in this section defined by this object file
|
||
and adjust their values. Note that we decide whether to
|
||
adjust the value based on the value stored in the ECOFF EXTR
|
||
structure, because the value stored in the hash table may
|
||
have been changed by an earlier expanded reloc and thus may
|
||
no longer correctly indicate whether the symbol is before or
|
||
after the expanded reloc. */
|
||
ext_count = ecoff_data (abfd)->debug_info.symbolic_header.iextMax;
|
||
adj_h_ptr = ecoff_data (abfd)->sym_hashes;
|
||
adj_h_ptr_end = adj_h_ptr + ext_count;
|
||
for (; adj_h_ptr < adj_h_ptr_end; adj_h_ptr++)
|
||
{
|
||
struct ecoff_link_hash_entry *adj_h;
|
||
|
||
adj_h = *adj_h_ptr;
|
||
if (adj_h != (struct ecoff_link_hash_entry *) NULL
|
||
&& adj_h->root.type == bfd_link_hash_defined
|
||
&& adj_h->root.u.def.section == sec
|
||
&& adj_h->esym.asym.value > int_rel.r_vaddr)
|
||
adj_h->root.u.def.value += PCREL16_EXPANSION_ADJUSTMENT;
|
||
}
|
||
|
||
/* Add an entry to the symbol value adjust list. This is used
|
||
by bfd_ecoff_debug_accumulate to adjust the values of
|
||
internal symbols and FDR's. */
|
||
adjust = ((struct ecoff_value_adjust *)
|
||
bfd_alloc (abfd, sizeof (struct ecoff_value_adjust)));
|
||
if (adjust == (struct ecoff_value_adjust *) NULL)
|
||
{
|
||
bfd_set_error (bfd_error_no_memory);
|
||
goto error_return;
|
||
}
|
||
|
||
adjust->start = int_rel.r_vaddr;
|
||
adjust->end = sec->vma + sec->_raw_size;
|
||
adjust->adjust = PCREL16_EXPANSION_ADJUSTMENT;
|
||
|
||
adjust->next = ecoff_data (abfd)->debug_info.adjust;
|
||
ecoff_data (abfd)->debug_info.adjust = adjust;
|
||
}
|
||
|
||
if (contents != (bfd_byte *) NULL && ! info->keep_memory)
|
||
free (contents);
|
||
|
||
return true;
|
||
|
||
error_return:
|
||
if (contents != (bfd_byte *) NULL && ! info->keep_memory)
|
||
free (contents);
|
||
return false;
|
||
}
|
||
|
||
/* This routine is called from mips_relocate_section when a PC
|
||
relative reloc must be expanded into the five instruction sequence.
|
||
It handles all the details of the expansion, including resolving
|
||
the reloc. */
|
||
|
||
static boolean
|
||
mips_relax_pcrel16 (info, input_bfd, input_section, h, location, address)
|
||
struct bfd_link_info *info;
|
||
bfd *input_bfd;
|
||
asection *input_section;
|
||
struct ecoff_link_hash_entry *h;
|
||
bfd_byte *location;
|
||
bfd_vma address;
|
||
{
|
||
bfd_vma relocation;
|
||
|
||
/* 0x0411ffff is bgezal $0,. == bal . */
|
||
BFD_ASSERT (bfd_get_32 (input_bfd, location) == 0x0411ffff);
|
||
|
||
/* We need to compute the distance between the symbol and the
|
||
current address plus eight. */
|
||
relocation = (h->root.u.def.value
|
||
+ h->root.u.def.section->output_section->vma
|
||
+ h->root.u.def.section->output_offset);
|
||
relocation -= address + 8;
|
||
|
||
/* If the lower half is negative, increment the upper 16 half. */
|
||
if ((relocation & 0x8000) != 0)
|
||
relocation += 0x10000;
|
||
|
||
bfd_put_32 (input_bfd, 0x04110001, location); /* bal .+8 */
|
||
bfd_put_32 (input_bfd,
|
||
0x3c010000 | ((relocation >> 16) & 0xffff), /* lui $at,XX */
|
||
location + 4);
|
||
bfd_put_32 (input_bfd,
|
||
0x24210000 | (relocation & 0xffff), /* addiu $at,$at,XX */
|
||
location + 8);
|
||
bfd_put_32 (input_bfd, 0x003f0821, location + 12); /* addu $at,$at,$ra */
|
||
bfd_put_32 (input_bfd, 0x0020f809, location + 16); /* jalr $at */
|
||
|
||
return true;
|
||
}
|
||
|
||
/* This is the ECOFF backend structure. The backend field of the
|
||
target vector points to this. */
|
||
|
||
static const struct ecoff_backend_data mips_ecoff_backend_data =
|
||
{
|
||
/* COFF backend structure. */
|
||
{
|
||
(void (*) PARAMS ((bfd *,PTR,int,int,int,int,PTR))) bfd_void, /* aux_in */
|
||
(void (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* sym_in */
|
||
(void (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* lineno_in */
|
||
(unsigned (*) PARAMS ((bfd *,PTR,int,int,int,int,PTR)))bfd_void,/*aux_out*/
|
||
(unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* sym_out */
|
||
(unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* lineno_out */
|
||
(unsigned (*) PARAMS ((bfd *,PTR,PTR))) bfd_void, /* reloc_out */
|
||
mips_ecoff_swap_filehdr_out, mips_ecoff_swap_aouthdr_out,
|
||
mips_ecoff_swap_scnhdr_out,
|
||
FILHSZ, AOUTSZ, SCNHSZ, 0, 0, 0, true,
|
||
mips_ecoff_swap_filehdr_in, mips_ecoff_swap_aouthdr_in,
|
||
mips_ecoff_swap_scnhdr_in, mips_ecoff_bad_format_hook,
|
||
ecoff_set_arch_mach_hook, ecoff_mkobject_hook,
|
||
ecoff_styp_to_sec_flags, ecoff_make_section_hook, ecoff_set_alignment_hook,
|
||
ecoff_slurp_symbol_table, NULL, NULL
|
||
},
|
||
/* Supported architecture. */
|
||
bfd_arch_mips,
|
||
/* Initial portion of armap string. */
|
||
"__________",
|
||
/* The page boundary used to align sections in a demand-paged
|
||
executable file. E.g., 0x1000. */
|
||
0x1000,
|
||
/* True if the .rdata section is part of the text segment, as on the
|
||
Alpha. False if .rdata is part of the data segment, as on the
|
||
MIPS. */
|
||
false,
|
||
/* Bitsize of constructor entries. */
|
||
32,
|
||
/* Reloc to use for constructor entries. */
|
||
&mips_howto_table[MIPS_R_REFWORD],
|
||
{
|
||
/* 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,
|
||
/* 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
|
||
},
|
||
/* External reloc size. */
|
||
RELSZ,
|
||
/* Reloc swapping functions. */
|
||
mips_ecoff_swap_reloc_in,
|
||
mips_ecoff_swap_reloc_out,
|
||
/* Backend reloc tweaking. */
|
||
mips_adjust_reloc_in,
|
||
mips_adjust_reloc_out,
|
||
/* Relocate section contents while linking. */
|
||
mips_relocate_section
|
||
};
|
||
|
||
/* Looking up a reloc type is MIPS specific. */
|
||
#define ecoff_bfd_reloc_type_lookup mips_bfd_reloc_type_lookup
|
||
|
||
/* Getting relocated section contents is generic. */
|
||
#define ecoff_bfd_get_relocated_section_contents \
|
||
bfd_generic_get_relocated_section_contents
|
||
|
||
/* Relaxing sections is MIPS specific. */
|
||
#define ecoff_bfd_relax_section mips_relax_section
|
||
|
||
bfd_target ecoff_little_vec =
|
||
{
|
||
"ecoff-littlemips", /* name */
|
||
bfd_target_ecoff_flavour,
|
||
false, /* data byte order is little */
|
||
false, /* header byte order is little */
|
||
|
||
(HAS_RELOC | EXEC_P | /* object flags */
|
||
HAS_LINENO | HAS_DEBUG |
|
||
HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
|
||
|
||
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* sect
|
||
flags */
|
||
0, /* leading underscore */
|
||
' ', /* ar_pad_char */
|
||
15, /* ar_max_namelen */
|
||
4, /* minimum alignment power */
|
||
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
|
||
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
|
||
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* data */
|
||
bfd_getl64, bfd_getl_signed_64, bfd_putl64,
|
||
bfd_getl32, bfd_getl_signed_32, bfd_putl32,
|
||
bfd_getl16, bfd_getl_signed_16, bfd_putl16, /* hdrs */
|
||
|
||
{_bfd_dummy_target, coff_object_p, /* bfd_check_format */
|
||
ecoff_archive_p, _bfd_dummy_target},
|
||
{bfd_false, ecoff_mkobject, /* bfd_set_format */
|
||
_bfd_generic_mkarchive, bfd_false},
|
||
{bfd_false, ecoff_write_object_contents, /* bfd_write_contents */
|
||
_bfd_write_archive_contents, bfd_false},
|
||
|
||
BFD_JUMP_TABLE_GENERIC (ecoff),
|
||
BFD_JUMP_TABLE_COPY (ecoff),
|
||
BFD_JUMP_TABLE_CORE (_bfd_nocore),
|
||
BFD_JUMP_TABLE_ARCHIVE (ecoff),
|
||
BFD_JUMP_TABLE_SYMBOLS (ecoff),
|
||
BFD_JUMP_TABLE_RELOCS (ecoff),
|
||
BFD_JUMP_TABLE_WRITE (ecoff),
|
||
BFD_JUMP_TABLE_LINK (ecoff),
|
||
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
|
||
|
||
(PTR) &mips_ecoff_backend_data
|
||
};
|
||
|
||
bfd_target ecoff_big_vec =
|
||
{
|
||
"ecoff-bigmips", /* name */
|
||
bfd_target_ecoff_flavour,
|
||
true, /* data byte order is big */
|
||
true, /* header byte order is big */
|
||
|
||
(HAS_RELOC | EXEC_P | /* object flags */
|
||
HAS_LINENO | HAS_DEBUG |
|
||
HAS_SYMS | HAS_LOCALS | WP_TEXT | D_PAGED),
|
||
|
||
(SEC_HAS_CONTENTS | SEC_ALLOC | SEC_LOAD | SEC_RELOC), /* sect flags */
|
||
0, /* leading underscore */
|
||
' ', /* ar_pad_char */
|
||
15, /* ar_max_namelen */
|
||
4, /* minimum alignment power */
|
||
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
||
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
||
bfd_getb16, bfd_getb_signed_16, bfd_putb16,
|
||
bfd_getb64, bfd_getb_signed_64, bfd_putb64,
|
||
bfd_getb32, bfd_getb_signed_32, bfd_putb32,
|
||
bfd_getb16, bfd_getb_signed_16, bfd_putb16,
|
||
{_bfd_dummy_target, coff_object_p, /* bfd_check_format */
|
||
ecoff_archive_p, _bfd_dummy_target},
|
||
{bfd_false, ecoff_mkobject, /* bfd_set_format */
|
||
_bfd_generic_mkarchive, bfd_false},
|
||
{bfd_false, ecoff_write_object_contents, /* bfd_write_contents */
|
||
_bfd_write_archive_contents, bfd_false},
|
||
|
||
BFD_JUMP_TABLE_GENERIC (ecoff),
|
||
BFD_JUMP_TABLE_COPY (ecoff),
|
||
BFD_JUMP_TABLE_CORE (_bfd_nocore),
|
||
BFD_JUMP_TABLE_ARCHIVE (ecoff),
|
||
BFD_JUMP_TABLE_SYMBOLS (ecoff),
|
||
BFD_JUMP_TABLE_RELOCS (ecoff),
|
||
BFD_JUMP_TABLE_WRITE (ecoff),
|
||
BFD_JUMP_TABLE_LINK (ecoff),
|
||
BFD_JUMP_TABLE_DYNAMIC (_bfd_nodynamic),
|
||
|
||
(PTR) &mips_ecoff_backend_data
|
||
};
|