| 1 | /* BFD ECOFF object file private structure.
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| 2 | Copyright 1993, 1994, 1995, 1996, 1999 Free Software Foundation, Inc.
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| 3 | Written by Ian Lance Taylor, Cygnus Support.
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| 4 |
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| 5 | This file is part of BFD, the Binary File Descriptor library.
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| 6 |
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| 7 | This program is free software; you can redistribute it and/or modify
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| 8 | it under the terms of the GNU General Public License as published by
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| 9 | the Free Software Foundation; either version 2 of the License, or
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| 10 | (at your option) any later version.
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| 11 |
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| 12 | This program is distributed in the hope that it will be useful,
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| 13 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | GNU General Public License for more details.
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| 16 |
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| 17 | You should have received a copy of the GNU General Public License
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| 18 | along with this program; if not, write to the Free Software
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| 19 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
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| 20 |
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| 21 | #include "bfdlink.h"
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| 22 |
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| 23 | #ifndef ECOFF_H
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| 24 | #include "coff/ecoff.h"
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| 25 | #endif
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| 26 |
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| 27 | /* This is the backend information kept for ECOFF files. This
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| 28 | structure is constant for a particular backend. The first element
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| 29 | is the COFF backend data structure, so that ECOFF targets can use
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| 30 | the generic COFF code. */
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| 31 |
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| 32 | #define ecoff_backend(abfd) \
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| 33 | ((struct ecoff_backend_data *) (abfd)->xvec->backend_data)
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| 34 |
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| 35 | struct ecoff_backend_data
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| 36 | {
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| 37 | /* COFF backend information. This must be the first field. */
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| 38 | bfd_coff_backend_data coff;
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| 39 | /* Supported architecture. */
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| 40 | enum bfd_architecture arch;
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| 41 | /* Initial portion of armap string. */
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| 42 | const char *armap_start;
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| 43 | /* The page boundary used to align sections in a demand-paged
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| 44 | executable file. E.g., 0x1000. */
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| 45 | bfd_vma round;
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| 46 | /* True if the .rdata section is part of the text segment, as on the
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| 47 | Alpha. False if .rdata is part of the data segment, as on the
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| 48 | MIPS. */
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| 49 | boolean rdata_in_text;
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| 50 | /* Bitsize of constructor entries. */
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| 51 | unsigned int constructor_bitsize;
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| 52 | /* Reloc to use for constructor entries. */
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| 53 | reloc_howto_type *constructor_reloc;
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| 54 | /* How to swap debugging information. */
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| 55 | struct ecoff_debug_swap debug_swap;
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| 56 | /* External reloc size. */
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| 57 | bfd_size_type external_reloc_size;
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| 58 | /* Reloc swapping functions. */
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| 59 | void (*swap_reloc_in) PARAMS ((bfd *, PTR, struct internal_reloc *));
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| 60 | void (*swap_reloc_out) PARAMS ((bfd *, const struct internal_reloc *, PTR));
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| 61 | /* Backend reloc tweaking. */
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| 62 | void (*adjust_reloc_in) PARAMS ((bfd *, const struct internal_reloc *,
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| 63 | arelent *));
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| 64 | void (*adjust_reloc_out) PARAMS ((bfd *, const arelent *,
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| 65 | struct internal_reloc *));
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| 66 | /* Relocate section contents while linking. */
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| 67 | boolean (*relocate_section) PARAMS ((bfd *output_bfd, struct bfd_link_info *,
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| 68 | bfd *input_bfd, asection *input_section,
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| 69 | bfd_byte *contents,
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| 70 | PTR external_relocs));
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| 71 | /* Do final adjustments to filehdr and aouthdr. */
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| 72 | boolean (*adjust_headers) PARAMS ((bfd *, struct internal_filehdr *,
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| 73 | struct internal_aouthdr *));
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| 74 | /* Read an element from an archive at a given file position. This
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| 75 | is needed because OSF/1 3.2 uses a weird archive format. */
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| 76 | bfd *(*get_elt_at_filepos) PARAMS ((bfd *, file_ptr));
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| 77 | };
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| 78 |
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| 79 | /* This is the target specific information kept for ECOFF files. */
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| 80 |
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| 81 | #define ecoff_data(abfd) ((abfd)->tdata.ecoff_obj_data)
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| 82 |
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| 83 | typedef struct ecoff_tdata
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| 84 | {
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| 85 | /* The reloc file position, set by
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| 86 | ecoff_compute_section_file_positions. */
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| 87 | file_ptr reloc_filepos;
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| 88 |
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| 89 | /* The symbol table file position, set by _bfd_ecoff_mkobject_hook. */
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| 90 | file_ptr sym_filepos;
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| 91 |
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| 92 | /* The start and end of the text segment. Only valid for an
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| 93 | existing file, not for one we are creating. */
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| 94 | unsigned long text_start;
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| 95 | unsigned long text_end;
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| 96 |
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| 97 | /* The cached gp value. This is used when relocating. */
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| 98 | bfd_vma gp;
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| 99 |
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| 100 | /* The maximum size of objects to optimize using gp. This is
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| 101 | typically set by the -G option to the compiler, assembler or
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| 102 | linker. */
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| 103 | unsigned int gp_size;
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| 104 |
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| 105 | /* The register masks. When linking, all the masks found in the
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| 106 | input files are combined into the masks of the output file.
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| 107 | These are not all used for all targets, but that's OK, because
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| 108 | the relevant ones are the only ones swapped in and out. */
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| 109 | unsigned long gprmask;
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| 110 | unsigned long fprmask;
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| 111 | unsigned long cprmask[4];
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| 112 |
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| 113 | /* The ECOFF symbolic debugging information. */
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| 114 | struct ecoff_debug_info debug_info;
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| 115 |
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| 116 | /* The unswapped ECOFF symbolic information. */
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| 117 | PTR raw_syments;
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| 118 |
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| 119 | /* The canonical BFD symbols. */
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| 120 | struct ecoff_symbol_struct *canonical_symbols;
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| 121 |
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| 122 | /* A mapping from external symbol numbers to entries in the linker
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| 123 | hash table, used when linking. */
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| 124 | struct ecoff_link_hash_entry **sym_hashes;
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| 125 |
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| 126 | /* A mapping from reloc symbol indices to sections, used when
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| 127 | linking. */
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| 128 | asection **symndx_to_section;
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| 129 |
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| 130 | /* True if this BFD was written by the backend linker. */
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| 131 | boolean linker;
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| 132 |
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| 133 | /* True if a warning that multiple global pointer values are
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| 134 | needed in the output binary was issued already. */
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| 135 | boolean issued_multiple_gp_warning;
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| 136 |
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| 137 | /* Used by find_nearest_line entry point. The structure could be
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| 138 | included directly in this one, but there's no point to wasting
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| 139 | the memory just for the infrequently called find_nearest_line. */
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| 140 | struct ecoff_find_line *find_line_info;
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| 141 |
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| 142 | /* Whether the .rdata section is in the text segment for this
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| 143 | particular ECOFF file. This is not valid until
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| 144 | ecoff_compute_section_file_positions is called. */
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| 145 | boolean rdata_in_text;
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| 146 |
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| 147 | } ecoff_data_type;
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| 148 |
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| 149 | /* Each canonical asymbol really looks like this. */
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| 150 |
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| 151 | typedef struct ecoff_symbol_struct
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| 152 | {
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| 153 | /* The actual symbol which the rest of BFD works with */
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| 154 | asymbol symbol;
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| 155 |
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| 156 | /* The fdr for this symbol. */
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| 157 | FDR *fdr;
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| 158 |
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| 159 | /* true if this is a local symbol rather than an external one. */
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| 160 | boolean local;
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| 161 |
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| 162 | /* A pointer to the unswapped hidden information for this symbol.
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| 163 | This is either a struct sym_ext or a struct ext_ext, depending on
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| 164 | the value of the local field above. */
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| 165 | PTR native;
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| 166 | } ecoff_symbol_type;
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| 167 |
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| 168 | /* We take the address of the first element of a asymbol to ensure that the
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| 169 | macro is only ever applied to an asymbol. */
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| 170 | #define ecoffsymbol(asymbol) ((ecoff_symbol_type *) (&((asymbol)->the_bfd)))
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| 171 |
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| 172 | /* We need to save the index of an external symbol when we write it
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| 173 | out so that can set the symbol index correctly when we write out
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| 174 | the relocs. */
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| 175 | #define ecoff_get_sym_index(symbol) ((symbol)->udata.i)
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| 176 | #define ecoff_set_sym_index(symbol, idx) ((symbol)->udata.i = (idx))
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| 177 |
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| 178 | /* When generating MIPS embedded PIC code, the linker relaxes the code
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| 179 | to turn PC relative branches into longer code sequences when the PC
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| 180 | relative branch is out of range. This involves reading the relocs
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| 181 | in bfd_relax_section as well as in bfd_final_link, and requires the
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| 182 | code to keep track of which relocs have been expanded. A pointer
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| 183 | to this structure is put in the used_by_bfd pointer of a section to
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| 184 | keep track of this information. The user_by_bfd pointer will be
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| 185 | NULL if the information was not needed. */
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| 186 |
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| 187 | struct ecoff_section_tdata
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| 188 | {
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| 189 | /* The unswapped relocs for this section. These are stored in
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| 190 | memory so the input file does not have to be read twice. */
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| 191 | PTR external_relocs;
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| 192 |
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| 193 | /* The contents of the section. These bytes may or may not be saved
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| 194 | in memory, but if it is this is a pointer to them. */
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| 195 | bfd_byte *contents;
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| 196 |
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| 197 | /* Offset adjustments for PC relative branches. A number other than
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| 198 | 1 is an addend for a PC relative branch, or a switch table entry
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| 199 | which is the difference of two .text locations; this addend
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| 200 | arises because the branch or difference crosses one or more
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| 201 | branches which were expanded into a larger code sequence. A 1
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| 202 | means that this branch was itself expanded into a larger code
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| 203 | sequence. 1 is not a possible offset, since all offsets must be
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| 204 | multiples of the instruction size, which is 4; also, the only
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| 205 | relocs with non-zero offsets will be PC relative branches or
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| 206 | switch table entries within the same object file. If this field
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| 207 | is NULL, no branches were expanded and no offsets are required.
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| 208 | Otherwise there are as many entries as there are relocs in the
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| 209 | section, and the entry for any reloc that is not PC relative is
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| 210 | zero. */
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| 211 | long *offsets;
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| 212 |
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| 213 | /* When producing an executable (i.e., final, non-relocatable link)
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| 214 | on the Alpha, we may need to use multiple global pointer values
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| 215 | to span the entire .lita section. In essence, we allow each
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| 216 | input .lita section to have its own gp value. To support this,
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| 217 | we need to keep track of the gp values that we picked for each
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| 218 | input .lita section . */
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| 219 | bfd_vma gp;
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| 220 | };
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| 221 |
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| 222 | /* An accessor macro for the ecoff_section_tdata structure. */
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| 223 | #define ecoff_section_data(abfd, sec) \
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| 224 | ((struct ecoff_section_tdata *) (sec)->used_by_bfd)
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| 225 |
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| 226 | /* ECOFF linker hash table entries. */
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| 227 |
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| 228 | struct ecoff_link_hash_entry
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| 229 | {
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| 230 | struct bfd_link_hash_entry root;
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| 231 | /* Symbol index in output file. */
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| 232 | long indx;
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| 233 | /* BFD that ext field value came from. */
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| 234 | bfd *abfd;
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| 235 | /* ECOFF external symbol information. */
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| 236 | EXTR esym;
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| 237 | /* Nonzero if this symbol has been written out. */
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| 238 | char written;
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| 239 | /* Nonzero if this symbol was referred to as small undefined. */
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| 240 | char small;
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| 241 | };
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| 242 |
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| 243 | /* ECOFF linker hash table. */
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| 244 |
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| 245 | struct ecoff_link_hash_table
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| 246 | {
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| 247 | struct bfd_link_hash_table root;
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| 248 | };
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| 249 |
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| 250 | /* Make an ECOFF object. */
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| 251 | extern boolean _bfd_ecoff_mkobject PARAMS ((bfd *));
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| 252 |
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| 253 | /* Read in the ECOFF symbolic debugging information. */
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| 254 | extern boolean _bfd_ecoff_slurp_symbolic_info
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| 255 | PARAMS ((bfd *, asection *, struct ecoff_debug_info *));
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| 256 |
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| 257 | /* Generic ECOFF BFD backend vectors. */
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| 258 |
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| 259 | extern boolean _bfd_ecoff_write_object_contents PARAMS ((bfd *abfd));
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| 260 | extern const bfd_target *_bfd_ecoff_archive_p PARAMS ((bfd *abfd));
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| 261 |
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| 262 | #define _bfd_ecoff_close_and_cleanup _bfd_generic_close_and_cleanup
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| 263 | #define _bfd_ecoff_bfd_free_cached_info _bfd_generic_bfd_free_cached_info
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| 264 | extern boolean _bfd_ecoff_new_section_hook
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| 265 | PARAMS ((bfd *, asection *));
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| 266 | extern boolean _bfd_ecoff_get_section_contents
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| 267 | PARAMS ((bfd *, asection *, PTR location, file_ptr, bfd_size_type));
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| 268 |
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| 269 | #define _bfd_ecoff_bfd_link_split_section _bfd_generic_link_split_section
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| 270 |
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| 271 | extern boolean _bfd_ecoff_bfd_copy_private_bfd_data PARAMS ((bfd *, bfd *));
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| 272 | #define _bfd_ecoff_bfd_copy_private_section_data \
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| 273 | _bfd_generic_bfd_copy_private_section_data
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| 274 |
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| 275 | #define _bfd_ecoff_bfd_copy_private_symbol_data \
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| 276 | _bfd_generic_bfd_copy_private_symbol_data
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| 277 |
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| 278 | #define _bfd_ecoff_bfd_print_private_bfd_data \
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| 279 | _bfd_generic_bfd_print_private_bfd_data
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| 280 |
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| 281 | #define _bfd_ecoff_bfd_merge_private_bfd_data \
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| 282 | _bfd_generic_bfd_merge_private_bfd_data
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| 283 |
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| 284 | #define _bfd_ecoff_bfd_set_private_flags _bfd_generic_bfd_set_private_flags
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| 285 | extern boolean _bfd_ecoff_slurp_armap PARAMS ((bfd *abfd));
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| 286 | #define _bfd_ecoff_slurp_extended_name_table _bfd_slurp_extended_name_table
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| 287 | #define _bfd_ecoff_construct_extended_name_table \
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| 288 | _bfd_archive_bsd_construct_extended_name_table
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| 289 | #define _bfd_ecoff_truncate_arname bfd_dont_truncate_arname
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| 290 | extern boolean _bfd_ecoff_write_armap
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| 291 | PARAMS ((bfd *, unsigned int, struct orl *, unsigned int, int));
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| 292 | #define _bfd_ecoff_read_ar_hdr _bfd_generic_read_ar_hdr
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| 293 | #define _bfd_ecoff_openr_next_archived_file \
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| 294 | bfd_generic_openr_next_archived_file
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| 295 | #define _bfd_ecoff_get_elt_at_index _bfd_generic_get_elt_at_index
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| 296 | #define _bfd_ecoff_generic_stat_arch_elt bfd_generic_stat_arch_elt
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| 297 | #define _bfd_ecoff_update_armap_timestamp bfd_true
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| 298 |
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| 299 | extern long _bfd_ecoff_get_symtab_upper_bound PARAMS ((bfd *abfd));
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| 300 | extern long _bfd_ecoff_get_symtab PARAMS ((bfd *abfd, asymbol **alocation));
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| 301 | extern asymbol *_bfd_ecoff_make_empty_symbol PARAMS ((bfd *abfd));
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| 302 | extern void _bfd_ecoff_print_symbol
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| 303 | PARAMS ((bfd *, PTR filep, asymbol *, bfd_print_symbol_type));
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| 304 | extern void _bfd_ecoff_get_symbol_info
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| 305 | PARAMS ((bfd *, asymbol *, symbol_info *));
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| 306 | extern boolean _bfd_ecoff_bfd_is_local_label_name
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| 307 | PARAMS ((bfd *, const char *));
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| 308 | #define _bfd_ecoff_get_lineno _bfd_nosymbols_get_lineno
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| 309 | extern boolean _bfd_ecoff_find_nearest_line
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| 310 | PARAMS ((bfd *, asection *, asymbol **, bfd_vma offset,
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| 311 | const char **filename_ptr, const char **fnname_ptr,
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| 312 | unsigned int *retline_ptr));
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| 313 | #define _bfd_ecoff_bfd_make_debug_symbol _bfd_nosymbols_bfd_make_debug_symbol
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| 314 | #define _bfd_ecoff_read_minisymbols _bfd_generic_read_minisymbols
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| 315 | #define _bfd_ecoff_minisymbol_to_symbol _bfd_generic_minisymbol_to_symbol
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| 316 |
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| 317 | #define _bfd_ecoff_get_reloc_upper_bound coff_get_reloc_upper_bound
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| 318 | extern long _bfd_ecoff_canonicalize_reloc
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| 319 | PARAMS ((bfd *, asection *, arelent **, asymbol **symbols));
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| 320 | /* ecoff_bfd_reloc_type_lookup defined by backend. */
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| 321 |
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| 322 | extern boolean _bfd_ecoff_set_arch_mach
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| 323 | PARAMS ((bfd *, enum bfd_architecture, unsigned long machine));
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| 324 | extern boolean _bfd_ecoff_set_section_contents
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| 325 | PARAMS ((bfd *, asection *, PTR location, file_ptr, bfd_size_type));
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| 326 |
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| 327 | extern int _bfd_ecoff_sizeof_headers PARAMS ((bfd *abfd, boolean reloc));
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| 328 | /* ecoff_bfd_get_relocated_section_contents defined by backend. */
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| 329 | /* ecoff_bfd_relax_section defined by backend. */
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| 330 | extern struct bfd_link_hash_table *_bfd_ecoff_bfd_link_hash_table_create
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| 331 | PARAMS ((bfd *));
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| 332 | extern boolean _bfd_ecoff_bfd_link_add_symbols
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| 333 | PARAMS ((bfd *, struct bfd_link_info *));
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| 334 | extern boolean _bfd_ecoff_bfd_final_link
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| 335 | PARAMS ((bfd *, struct bfd_link_info *));
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| 336 |
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| 337 | /* Hook functions for the generic COFF section reading code. */
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| 338 |
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| 339 | extern PTR _bfd_ecoff_mkobject_hook PARAMS ((bfd *, PTR filehdr, PTR aouthdr));
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| 340 | #define _bfd_ecoff_set_alignment_hook \
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| 341 | ((void (*) PARAMS ((bfd *, asection *, PTR))) bfd_void)
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| 342 | extern boolean _bfd_ecoff_set_arch_mach_hook PARAMS ((bfd *abfd, PTR filehdr));
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| 343 | extern flagword _bfd_ecoff_styp_to_sec_flags
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| 344 | PARAMS ((bfd *abfd, PTR hdr, const char *name, asection *section));
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| 345 | extern boolean _bfd_ecoff_slurp_symbol_table PARAMS ((bfd *abfd));
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| 346 |
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| 347 | /* ECOFF auxiliary information swapping routines. These are the same
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| 348 | for all ECOFF targets, so they are defined in ecofflink.c. */
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| 349 |
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| 350 | extern void _bfd_ecoff_swap_tir_in
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| 351 | PARAMS ((int, const struct tir_ext *, TIR *));
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| 352 | extern void _bfd_ecoff_swap_tir_out
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| 353 | PARAMS ((int, const TIR *, struct tir_ext *));
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| 354 | extern void _bfd_ecoff_swap_rndx_in
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| 355 | PARAMS ((int, const struct rndx_ext *, RNDXR *));
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| 356 | extern void _bfd_ecoff_swap_rndx_out
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| 357 | PARAMS ((int, const RNDXR *, struct rndx_ext *));
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