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- /* BFD back-end for MIPS Extended-Coff files.
- Copyright 1990, 1991, 1992, 1993 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"
- #include "sysdep.h"
- #include "bfdlink.h"
- #include "libbfd.h"
- #include "coff/internal.h"
- #include "coff/sym.h"
- #include "coff/symconst.h"
- #include "coff/ecoff.h"
- #include "coff/mips.h"
- #include "libcoff.h"
- #include "libecoff.h"
-
- /* Prototypes for static functions. */
-
- static boolean mips_ecoff_bad_format_hook PARAMS ((bfd *abfd, PTR filehdr));
- static void mips_ecoff_swap_reloc_in PARAMS ((bfd *, PTR,
- struct internal_reloc *));
- static void mips_ecoff_swap_reloc_out PARAMS ((bfd *,
- const struct internal_reloc *,
- PTR));
- static void mips_adjust_reloc_in PARAMS ((bfd *,
- const struct internal_reloc *,
- arelent *));
- static void mips_adjust_reloc_out PARAMS ((bfd *, const arelent *,
- struct internal_reloc *));
- static bfd_reloc_status_type mips_generic_reloc PARAMS ((bfd *abfd,
- arelent *reloc,
- asymbol *symbol,
- PTR data,
- asection *section,
- bfd *output_bfd,
- char **error));
- static bfd_reloc_status_type mips_refhi_reloc PARAMS ((bfd *abfd,
- arelent *reloc,
- asymbol *symbol,
- PTR data,
- asection *section,
- bfd *output_bfd,
- char **error));
- static bfd_reloc_status_type mips_reflo_reloc PARAMS ((bfd *abfd,
- arelent *reloc,
- asymbol *symbol,
- PTR data,
- asection *section,
- bfd *output_bfd,
- char **error));
- static bfd_reloc_status_type mips_gprel_reloc PARAMS ((bfd *abfd,
- arelent *reloc,
- asymbol *symbol,
- PTR data,
- asection *section,
- bfd *output_bfd,
- char **error));
- static void mips_relocate_refhi PARAMS ((struct internal_reloc *refhi,
- struct internal_reloc *reflo,
- bfd *input_bfd,
- asection *input_section,
- bfd_byte *contents,
- bfd_vma relocation));
- static boolean mips_relocate_section PARAMS ((bfd *, struct bfd_link_info *,
- bfd *, asection *,
- bfd_byte *, PTR));
-
- /* ECOFF has COFF sections, but the debugging information is stored in
- a completely different format. ECOFF targets use some of the
- swapping routines from coffswap.h, and some of the generic COFF
- routines in coffgen.c, but, unlike the real COFF targets, do not
- use coffcode.h itself.
-
- Get the generic COFF swapping routines, except for the reloc,
- symbol, and lineno ones. Give them ECOFF names. */
- #define MIPSECOFF
- #define NO_COFF_RELOCS
- #define NO_COFF_SYMBOLS
- #define NO_COFF_LINENOS
- #define coff_swap_filehdr_in mips_ecoff_swap_filehdr_in
- #define coff_swap_filehdr_out mips_ecoff_swap_filehdr_out
- #define coff_swap_aouthdr_in mips_ecoff_swap_aouthdr_in
- #define coff_swap_aouthdr_out mips_ecoff_swap_aouthdr_out
- #define coff_swap_scnhdr_in mips_ecoff_swap_scnhdr_in
- #define coff_swap_scnhdr_out mips_ecoff_swap_scnhdr_out
- #include "coffswap.h"
-
- /* Get the ECOFF swapping routines. */
- #define ECOFF_32
- #include "ecoffswap.h"
-
- /* How to process the various relocs types. */
-
- static reloc_howto_type mips_howto_table[] =
- {
- /* Reloc type 0 is ignored. The reloc reading code ensures that
- this is a reference to the .abs section, which will cause
- bfd_perform_relocation to do nothing. */
- HOWTO (MIPS_R_IGNORE, /* type */
- 0, /* rightshift */
- 0, /* size (0 = byte, 1 = short, 2 = long) */
- 8, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- 0, /* special_function */
- "IGNORE", /* name */
- false, /* partial_inplace */
- 0, /* src_mask */
- 0, /* dst_mask */
- false), /* pcrel_offset */
-
- /* A 16 bit reference to a symbol, normally from a data section. */
- HOWTO (MIPS_R_REFHALF, /* type */
- 0, /* rightshift */
- 1, /* size (0 = byte, 1 = short, 2 = long) */
- 16, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- mips_generic_reloc, /* special_function */
- "REFHALF", /* name */
- true, /* partial_inplace */
- 0xffff, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
-
- /* A 32 bit reference to a symbol, normally from a data section. */
- HOWTO (MIPS_R_REFWORD, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 32, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- mips_generic_reloc, /* special_function */
- "REFWORD", /* name */
- true, /* partial_inplace */
- 0xffffffff, /* src_mask */
- 0xffffffff, /* dst_mask */
- false), /* pcrel_offset */
-
- /* A 26 bit absolute jump address. */
- HOWTO (MIPS_R_JMPADDR, /* 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. */
- mips_generic_reloc, /* special_function */
- "JMPADDR", /* name */
- true, /* partial_inplace */
- 0x3ffffff, /* src_mask */
- 0x3ffffff, /* dst_mask */
- false), /* pcrel_offset */
-
- /* The high 16 bits of a symbol value. Handled by the function
- mips_refhi_reloc. */
- HOWTO (MIPS_R_REFHI, /* type */
- 16, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 16, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_bitfield, /* complain_on_overflow */
- mips_refhi_reloc, /* special_function */
- "REFHI", /* name */
- true, /* partial_inplace */
- 0xffff, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
-
- /* The low 16 bits of a symbol value. */
- HOWTO (MIPS_R_REFLO, /* type */
- 0, /* rightshift */
- 2, /* size (0 = byte, 1 = short, 2 = long) */
- 16, /* bitsize */
- false, /* pc_relative */
- 0, /* bitpos */
- complain_overflow_dont, /* complain_on_overflow */
- mips_reflo_reloc, /* special_function */
- "REFLO", /* name */
- true, /* partial_inplace */
- 0xffff, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
-
- /* A reference to an offset from the gp register. Handled by the
- function mips_gprel_reloc. */
- HOWTO (MIPS_R_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 */
- mips_gprel_reloc, /* special_function */
- "GPREL", /* name */
- true, /* partial_inplace */
- 0xffff, /* src_mask */
- 0xffff, /* dst_mask */
- false), /* pcrel_offset */
-
- /* A reference to a literal using an offset from the gp register.
- Handled by the function mips_gprel_reloc. */
- HOWTO (MIPS_R_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 */
- mips_gprel_reloc, /* special_function */
- "LITERAL", /* name */
- true, /* partial_inplace */
- 0xffff, /* src_mask */
- 0xffff, /* dst_mask */
- false) /* pcrel_offset */
- };
-
- #define MIPS_HOWTO_COUNT \
- (sizeof mips_howto_table / sizeof mips_howto_table[0])
-
- /* 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;
- }
- }
-
- /* 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;
-
- BFD_ASSERT (intern->r_extern
- || (intern->r_symndx >= 0 && intern->r_symndx <= 12));
-
- 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] = intern->r_symndx >> RELOC_BITS0_SYMNDX_SH_LEFT_BIG;
- ext->r_bits[1] = intern->r_symndx >> RELOC_BITS1_SYMNDX_SH_LEFT_BIG;
- ext->r_bits[2] = intern->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] = intern->r_symndx >> RELOC_BITS0_SYMNDX_SH_LEFT_LITTLE;
- ext->r_bits[1] = intern->r_symndx >> RELOC_BITS1_SYMNDX_SH_LEFT_LITTLE;
- ext->r_bits[2] = intern->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_LITERAL)
- 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;
-
- 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;
- {
- }
-
- /* 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;
- }
-
- /* 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:
- 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;
- 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,
- relocation)
- struct internal_reloc *refhi;
- struct internal_reloc *reflo;
- bfd *input_bfd;
- asection *input_section;
- bfd_byte *contents;
- bfd_vma relocation;
- {
- unsigned long insn;
- unsigned long val;
- unsigned long vallo;
-
- insn = bfd_get_32 (input_bfd,
- contents + refhi->r_vaddr - input_section->vma);
- vallo = (bfd_get_32 (input_bfd,
- contents + 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 + 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;
- struct external_reloc *ext_rel;
- struct external_reloc *ext_rel_end;
- boolean got_reflo;
-
- 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 *))));
-
- 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;
-
- ext_rel = (struct external_reloc *) external_relocs;
- ext_rel_end = ext_rel + input_section->reloc_count;
- for (; ext_rel < ext_rel_end; ext_rel++)
- {
- struct internal_reloc int_rel;
- struct internal_reloc reflo_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];
-
- 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)
- 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 (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)
- {
- asection *hsec;
- 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. */
- hsec = h->root.u.def.section;
- name = bfd_get_section_name (output_bfd,
- hsec->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
- + hsec->output_section->vma
- + hsec->output_offset);
- }
- 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 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
- + int_rel.r_vaddr
- - input_section->vma));
- else
- {
- mips_relocate_refhi (&int_rel, &reflo_int_rel,
- input_bfd, input_section, contents,
- 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);
-
- /* Adjust a PC relative relocation by removing the
- reference to the original source section. */
- if (howto->pc_relative)
- relocation += input_section->vma;
- }
-
- 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,
- relocation,
- addend);
- else
- {
- mips_relocate_refhi (&int_rel, &reflo_int_rel, input_bfd,
- input_section, contents, relocation);
- r = bfd_reloc_ok;
- }
- }
-
- if (r != bfd_reloc_ok)
- {
- switch (r)
- {
- default:
- case bfd_reloc_outofrange:
- abort ();
- case bfd_reloc_overflow:
- if (! ((*info->callbacks->reloc_overflow)
- (info, input_bfd, input_section,
- int_rel.r_vaddr - input_section->vma)))
- return false;
- break;
- }
- }
- }
-
- 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,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,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
-
- /* Core file support is usually traditional (but note that Irix uses
- irix-core.c). */
- #define ecoff_core_file_p _bfd_dummy_target
- #define ecoff_core_file_failing_command _bfd_dummy_core_file_failing_command
- #define ecoff_core_file_failing_signal _bfd_dummy_core_file_failing_signal
- #define ecoff_core_file_matches_executable_p \
- _bfd_dummy_core_file_matches_executable_p
-
- 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},
- JUMP_TABLE (ecoff),
- (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, ecoff_core_file_p},
- {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},
- JUMP_TABLE(ecoff),
- (PTR) &mips_ecoff_backend_data
- /* Note that there is another bfd_target just above this one. If
- you are adding initializers here, you should be adding them there
- as well. */
- };
-