357 lines
14 KiB
C
357 lines
14 KiB
C
/* BFD ECOFF object file private structure.
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Copyright 1993, 1994, 1995, 1996, 1999 Free Software Foundation, Inc.
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Written by Ian Lance Taylor, Cygnus Support.
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This file is part of BFD, the Binary File Descriptor library.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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#include "bfdlink.h"
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#ifndef ECOFF_H
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#include "coff/ecoff.h"
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#endif
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/* This is the backend information kept for ECOFF files. This
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structure is constant for a particular backend. The first element
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is the COFF backend data structure, so that ECOFF targets can use
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the generic COFF code. */
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#define ecoff_backend(abfd) \
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((struct ecoff_backend_data *) (abfd)->xvec->backend_data)
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struct ecoff_backend_data
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{
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/* COFF backend information. This must be the first field. */
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bfd_coff_backend_data coff;
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/* Supported architecture. */
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enum bfd_architecture arch;
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/* Initial portion of armap string. */
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const char *armap_start;
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/* The page boundary used to align sections in a demand-paged
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executable file. E.g., 0x1000. */
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bfd_vma round;
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/* True if the .rdata section is part of the text segment, as on the
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Alpha. False if .rdata is part of the data segment, as on the
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MIPS. */
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boolean rdata_in_text;
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/* Bitsize of constructor entries. */
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unsigned int constructor_bitsize;
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/* Reloc to use for constructor entries. */
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reloc_howto_type *constructor_reloc;
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/* How to swap debugging information. */
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struct ecoff_debug_swap debug_swap;
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/* External reloc size. */
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bfd_size_type external_reloc_size;
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/* Reloc swapping functions. */
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void (*swap_reloc_in) PARAMS ((bfd *, PTR, struct internal_reloc *));
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void (*swap_reloc_out) PARAMS ((bfd *, const struct internal_reloc *, PTR));
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/* Backend reloc tweaking. */
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void (*adjust_reloc_in) PARAMS ((bfd *, const struct internal_reloc *,
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arelent *));
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void (*adjust_reloc_out) PARAMS ((bfd *, const arelent *,
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struct internal_reloc *));
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/* Relocate section contents while linking. */
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boolean (*relocate_section) PARAMS ((bfd *output_bfd, struct bfd_link_info *,
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bfd *input_bfd, asection *input_section,
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bfd_byte *contents,
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PTR external_relocs));
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/* Do final adjustments to filehdr and aouthdr. */
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boolean (*adjust_headers) PARAMS ((bfd *, struct internal_filehdr *,
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struct internal_aouthdr *));
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/* Read an element from an archive at a given file position. This
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is needed because OSF/1 3.2 uses a weird archive format. */
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bfd *(*get_elt_at_filepos) PARAMS ((bfd *, file_ptr));
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};
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/* This is the target specific information kept for ECOFF files. */
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#define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data)
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typedef struct ecoff_tdata
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{
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/* The reloc file position, set by
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ecoff_compute_section_file_positions. */
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file_ptr reloc_filepos;
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/* The symbol table file position, set by _bfd_ecoff_mkobject_hook. */
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file_ptr sym_filepos;
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/* The start and end of the text segment. Only valid for an
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existing file, not for one we are creating. */
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unsigned long text_start;
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unsigned long text_end;
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/* The cached gp value. This is used when relocating. */
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bfd_vma gp;
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/* The maximum size of objects to optimize using gp. This is
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typically set by the -G option to the compiler, assembler or
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linker. */
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unsigned int gp_size;
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/* The register masks. When linking, all the masks found in the
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input files are combined into the masks of the output file.
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These are not all used for all targets, but that's OK, because
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the relevant ones are the only ones swapped in and out. */
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unsigned long gprmask;
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unsigned long fprmask;
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unsigned long cprmask[4];
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/* The ECOFF symbolic debugging information. */
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struct ecoff_debug_info debug_info;
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/* The unswapped ECOFF symbolic information. */
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PTR raw_syments;
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/* The canonical BFD symbols. */
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struct ecoff_symbol_struct *canonical_symbols;
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/* A mapping from external symbol numbers to entries in the linker
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hash table, used when linking. */
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struct ecoff_link_hash_entry **sym_hashes;
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/* A mapping from reloc symbol indices to sections, used when
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linking. */
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asection **symndx_to_section;
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/* True if this BFD was written by the backend linker. */
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boolean linker;
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/* True if a warning that multiple global pointer values are
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needed in the output binary was issued already. */
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boolean issued_multiple_gp_warning;
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/* Used by find_nearest_line entry point. The structure could be
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included directly in this one, but there's no point to wasting
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the memory just for the infrequently called find_nearest_line. */
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struct ecoff_find_line *find_line_info;
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/* Whether the .rdata section is in the text segment for this
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particular ECOFF file. This is not valid until
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ecoff_compute_section_file_positions is called. */
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boolean rdata_in_text;
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} ecoff_data_type;
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/* Each canonical asymbol really looks like this. */
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typedef struct ecoff_symbol_struct
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{
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/* The actual symbol which the rest of BFD works with */
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asymbol symbol;
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/* The fdr for this symbol. */
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FDR *fdr;
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/* true if this is a local symbol rather than an external one. */
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boolean local;
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/* A pointer to the unswapped hidden information for this symbol.
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This is either a struct sym_ext or a struct ext_ext, depending on
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the value of the local field above. */
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PTR native;
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} ecoff_symbol_type;
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/* We take the address of the first element of a asymbol to ensure that the
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macro is only ever applied to an asymbol. */
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#define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd)))
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/* We need to save the index of an external symbol when we write it
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out so that can set the symbol index correctly when we write out
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the relocs. */
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#define ecoff_get_sym_index(symbol) ((symbol)->udata.i)
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#define ecoff_set_sym_index(symbol, idx) ((symbol)->udata.i = (idx))
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/* When generating MIPS embedded PIC code, the linker relaxes the code
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to turn PC relative branches into longer code sequences when the PC
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relative branch is out of range. This involves reading the relocs
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in bfd_relax_section as well as in bfd_final_link, and requires the
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code to keep track of which relocs have been expanded. A pointer
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to this structure is put in the used_by_bfd pointer of a section to
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keep track of this information. The user_by_bfd pointer will be
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NULL if the information was not needed. */
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struct ecoff_section_tdata
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{
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/* The unswapped relocs for this section. These are stored in
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memory so the input file does not have to be read twice. */
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PTR external_relocs;
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/* The contents of the section. These bytes may or may not be saved
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in memory, but if it is this is a pointer to them. */
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bfd_byte *contents;
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/* Offset adjustments for PC relative branches. A number other than
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1 is an addend for a PC relative branch, or a switch table entry
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which is the difference of two .text locations; this addend
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arises because the branch or difference crosses one or more
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branches which were expanded into a larger code sequence. A 1
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means that this branch was itself expanded into a larger code
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sequence. 1 is not a possible offset, since all offsets must be
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multiples of the instruction size, which is 4; also, the only
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relocs with non-zero offsets will be PC relative branches or
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switch table entries within the same object file. If this field
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is NULL, no branches were expanded and no offsets are required.
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Otherwise there are as many entries as there are relocs in the
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section, and the entry for any reloc that is not PC relative is
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zero. */
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long *offsets;
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/* When producing an executable (i.e., final, non-relocatable link)
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on the Alpha, we may need to use multiple global pointer values
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to span the entire .lita section. In essence, we allow each
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input .lita section to have its own gp value. To support this,
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we need to keep track of the gp values that we picked for each
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input .lita section . */
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bfd_vma gp;
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};
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/* An accessor macro for the ecoff_section_tdata structure. */
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#define ecoff_section_data(abfd, sec) \
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((struct ecoff_section_tdata *) (sec)->used_by_bfd)
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/* ECOFF linker hash table entries. */
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struct ecoff_link_hash_entry
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{
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struct bfd_link_hash_entry root;
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/* Symbol index in output file. */
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long indx;
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/* BFD that ext field value came from. */
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bfd *abfd;
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/* ECOFF external symbol information. */
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EXTR esym;
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/* Nonzero if this symbol has been written out. */
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char written;
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/* Nonzero if this symbol was referred to as small undefined. */
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char small;
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};
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/* ECOFF linker hash table. */
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struct ecoff_link_hash_table
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{
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struct bfd_link_hash_table root;
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};
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/* Make an ECOFF object. */
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extern boolean _bfd_ecoff_mkobject PARAMS ((bfd *));
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/* Read in the ECOFF symbolic debugging information. */
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extern boolean _bfd_ecoff_slurp_symbolic_info
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PARAMS ((bfd *, asection *, struct ecoff_debug_info *));
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/* Generic ECOFF BFD backend vectors. */
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extern boolean _bfd_ecoff_write_object_contents PARAMS ((bfd *abfd));
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extern const bfd_target *_bfd_ecoff_archive_p PARAMS ((bfd *abfd));
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#define _bfd_ecoff_close_and_cleanup _bfd_generic_close_and_cleanup
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#define _bfd_ecoff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
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extern boolean _bfd_ecoff_new_section_hook
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PARAMS ((bfd *, asection *));
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extern boolean _bfd_ecoff_get_section_contents
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PARAMS ((bfd *, asection *, PTR location, file_ptr, bfd_size_type));
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#define _bfd_ecoff_bfd_link_split_section _bfd_generic_link_split_section
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extern boolean _bfd_ecoff_bfd_copy_private_bfd_data PARAMS ((bfd *, bfd *));
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#define _bfd_ecoff_bfd_copy_private_section_data \
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_bfd_generic_bfd_copy_private_section_data
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#define _bfd_ecoff_bfd_copy_private_symbol_data \
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_bfd_generic_bfd_copy_private_symbol_data
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#define _bfd_ecoff_bfd_print_private_bfd_data \
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_bfd_generic_bfd_print_private_bfd_data
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#define _bfd_ecoff_bfd_merge_private_bfd_data \
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_bfd_generic_bfd_merge_private_bfd_data
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#define _bfd_ecoff_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
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extern boolean _bfd_ecoff_slurp_armap PARAMS ((bfd *abfd));
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#define _bfd_ecoff_slurp_extended_name_table _bfd_slurp_extended_name_table
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#define _bfd_ecoff_construct_extended_name_table \
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_bfd_archive_bsd_construct_extended_name_table
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#define _bfd_ecoff_truncate_arname bfd_dont_truncate_arname
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extern boolean _bfd_ecoff_write_armap
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PARAMS ((bfd *, unsigned int, struct orl *, unsigned int, int));
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#define _bfd_ecoff_read_ar_hdr _bfd_generic_read_ar_hdr
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#define _bfd_ecoff_openr_next_archived_file \
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bfd_generic_openr_next_archived_file
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#define _bfd_ecoff_get_elt_at_index _bfd_generic_get_elt_at_index
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#define _bfd_ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt
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#define _bfd_ecoff_update_armap_timestamp bfd_true
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extern long _bfd_ecoff_get_symtab_upper_bound PARAMS ((bfd *abfd));
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extern long _bfd_ecoff_get_symtab PARAMS ((bfd *abfd, asymbol **alocation));
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extern asymbol *_bfd_ecoff_make_empty_symbol PARAMS ((bfd *abfd));
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extern void _bfd_ecoff_print_symbol
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PARAMS ((bfd *, PTR filep, asymbol *, bfd_print_symbol_type));
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extern void _bfd_ecoff_get_symbol_info
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PARAMS ((bfd *, asymbol *, symbol_info *));
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extern boolean _bfd_ecoff_bfd_is_local_label_name
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PARAMS ((bfd *, const char *));
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#define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno
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extern boolean _bfd_ecoff_find_nearest_line
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PARAMS ((bfd *, asection *, asymbol **, bfd_vma offset,
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const char **filename_ptr, const char **fnname_ptr,
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unsigned int *retline_ptr));
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#define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
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#define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols
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#define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
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#define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound
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extern long _bfd_ecoff_canonicalize_reloc
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PARAMS ((bfd *, asection *, arelent **, asymbol **symbols));
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/* ecoff_bfd_reloc_type_lookup defined by backend. */
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extern boolean _bfd_ecoff_set_arch_mach
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PARAMS ((bfd *, enum bfd_architecture, unsigned long machine));
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extern boolean _bfd_ecoff_set_section_contents
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PARAMS ((bfd *, asection *, PTR location, file_ptr, bfd_size_type));
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extern int _bfd_ecoff_sizeof_headers PARAMS ((bfd *abfd, boolean reloc));
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/* ecoff_bfd_get_relocated_section_contents defined by backend. */
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/* ecoff_bfd_relax_section defined by backend. */
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extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create
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PARAMS ((bfd *));
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extern boolean _bfd_ecoff_bfd_link_add_symbols
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PARAMS ((bfd *, struct bfd_link_info *));
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extern boolean _bfd_ecoff_bfd_final_link
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PARAMS ((bfd *, struct bfd_link_info *));
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/* Hook functions for the generic COFF section reading code. */
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extern PTR _bfd_ecoff_mkobject_hook PARAMS ((bfd *, PTR filehdr, PTR aouthdr));
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#define _bfd_ecoff_set_alignment_hook \
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((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void)
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extern boolean _bfd_ecoff_set_arch_mach_hook PARAMS ((bfd *abfd, PTR filehdr));
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extern boolean _bfd_ecoff_styp_to_sec_flags
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PARAMS ((bfd *, PTR, const char *, asection *, flagword *));
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extern boolean _bfd_ecoff_slurp_symbol_table PARAMS ((bfd *abfd));
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/* ECOFF auxiliary information swapping routines. These are the same
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for all ECOFF targets, so they are defined in ecofflink.c. */
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extern void _bfd_ecoff_swap_tir_in
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PARAMS ((int, const struct tir_ext *, TIR *));
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extern void _bfd_ecoff_swap_tir_out
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PARAMS ((int, const TIR *, struct tir_ext *));
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extern void _bfd_ecoff_swap_rndx_in
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PARAMS ((int, const struct rndx_ext *, RNDXR *));
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extern void _bfd_ecoff_swap_rndx_out
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PARAMS ((int, const RNDXR *, struct rndx_ext *));
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