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authorRichard Henderson <rth@redhat.com>1999-05-03 07:29:06 +0000
committerRichard Henderson <rth@redhat.com>1999-05-03 07:29:06 +0000
commit860acaebec6b57ce27e244cc02a58e6651a4b6c3 (patch)
treeeff5420756a4bd56b40b74c2b828b261f327610b /bfd/som.h
parentf9c53ad2d7cb541cbe821d645b90437ac063e5db (diff)
downloadgdb-860acaebec6b57ce27e244cc02a58e6651a4b6c3.tar.gz
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+/* HP PA-RISC SOM object file format: definitions internal to BFD.
+ Copyright (C) 1990, 91, 92, 93, 94, 95, 96, 1998
+ Free Software Foundation, Inc.
+
+ Contributed by the Center for Software Science at the
+ University of Utah (pa-gdb-bugs@cs.utah.edu).
+
+ 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., 59 Temple Place - Suite 330, Boston, MA
+ 02111-1307, USA. */
+
+#ifndef _SOM_H
+#define _SOM_H
+
+#include "libhppa.h"
+
+#include <a.out.h>
+#include <lst.h>
+#include <ar.h>
+
+/* The SOM BFD backend doesn't currently use anything from these
+ two include files, but it's likely to need them in the future. */
+#ifdef R_DLT_REL
+#include <shl.h>
+#include <dl.h>
+#endif
+
+#if defined(HOST_HPPABSD) || defined (HOST_HPPAOSF)
+/* BSD uses a completely different scheme for object file identification.
+ so for now, define _PA_RISC_ID to accept any random value for a model
+ number. */
+#undef _PA_RISC_ID
+#define _PA_RISC_ID(__m_num) 1
+#endif /* HOST_HPPABSD */
+
+#define FILE_HDR_SIZE sizeof(struct header)
+#define AUX_HDR_SIZE sizeof(struct som_exec_auxhdr)
+
+typedef struct som_symbol
+ {
+ asymbol symbol;
+ unsigned int som_type;
+
+ /* Structured like the ELF tc_data union. Allows more code sharing
+ in GAS this way. */
+ union
+ {
+ struct
+ {
+ unsigned int hppa_arg_reloc;
+ unsigned int hppa_priv_level;
+ } ap;
+ PTR any;
+ }
+ tc_data;
+
+ /* Index of this symbol in the symbol table. Only used when
+ building relocation streams for incomplete objects. */
+ int index;
+
+ /* How many times this symbol is used in a relocation. By sorting
+ the symbols from most used to least used we can significantly
+ reduce the size of the relocation stream for incomplete objects. */
+ int reloc_count;
+
+ /* During object file writing, the offset of the name of this symbol
+ in the SOM string table. */
+ int stringtab_offset;
+ }
+som_symbol_type;
+
+/* A structure containing all the magic information stored in a BFD's
+ private data which needs to be copied during an objcopy/strip run. */
+struct som_exec_data
+ {
+ /* Sort-of a magic number. BSD uses it to distinguish between
+ native executables and hpux executables. */
+ short system_id;
+
+ /* Magic exec flags. These control things like whether or not
+ null pointer dereferencing is allowed and the like. */
+ long exec_flags;
+
+ /* Add more stuff here as needed. Good examples of information
+ we might want to pass would be presumed_dp, entry_* and maybe
+ others from the file header. */
+ };
+
+struct somdata
+ {
+ /* All the magic information about an executable which lives
+ in the private BFD structure and needs to be copied from
+ the input bfd to the output bfd during a objcopy/strip. */
+ struct som_exec_data *exec_data;
+
+ /* These three fields are only used when writing files and are
+ generated from scratch. They need not be copied for objcopy
+ or strip to work. */
+ struct header *file_hdr;
+ struct copyright_aux_hdr *copyright_aux_hdr;
+ struct user_string_aux_hdr *version_aux_hdr;
+ struct som_exec_auxhdr *exec_hdr;
+ COMPUNIT *comp_unit;
+
+ /* Pointers to a saved copy of the symbol and string tables. These
+ need not be copied for objcopy or strip to work. */
+ som_symbol_type *symtab;
+ char *stringtab;
+ asymbol **sorted_syms;
+
+ /* We remember these offsets so that after check_file_format, we have
+ no dependencies on the particular format of the exec_hdr.
+ These offsets need not be copied for objcopy or strip to work. */
+
+ file_ptr sym_filepos;
+ file_ptr str_filepos;
+ file_ptr reloc_filepos;
+ unsigned stringtab_size;
+ };
+
+struct som_data_struct
+ {
+ struct somdata a;
+ };
+
+/* Substructure of som_section_data_struct used to hold information
+ which can't be represented by the generic BFD section structure,
+ but which must be copied during objcopy or strip. */
+struct som_copyable_section_data_struct
+ {
+ /* Various fields in space and subspace headers that we need
+ to pass around. */
+ unsigned int sort_key : 8;
+ unsigned int access_control_bits : 7;
+ unsigned int is_defined : 1;
+ unsigned int is_private : 1;
+ unsigned int quadrant : 2;
+
+ /* For subspaces, this points to the section which represents the
+ space in which the subspace is contained. For spaces it points
+ back to the section for this space. */
+ asection *container;
+
+ /* The user-specified space number. It is wrong to use this as
+ an index since duplicates and holes are allowed. */
+ int space_number;
+
+ /* Add more stuff here as needed. Good examples of information
+ we might want to pass would be initialization pointers,
+ and the many subspace flags we do not represent yet. */
+ };
+
+/* Used to keep extra SOM specific information for a given section.
+
+ reloc_size holds the size of the relocation stream, note this
+ is very different from the number of relocations as SOM relocations
+ are variable length.
+
+ reloc_stream is the actual stream of relocation entries. */
+
+struct som_section_data_struct
+ {
+ struct som_copyable_section_data_struct *copy_data;
+ unsigned int reloc_size;
+ char *reloc_stream;
+ struct space_dictionary_record *space_dict;
+ struct subspace_dictionary_record *subspace_dict;
+ };
+
+#define somdata(bfd) ((bfd)->tdata.som_data->a)
+#define obj_som_exec_data(bfd) (somdata(bfd).exec_data)
+#define obj_som_file_hdr(bfd) (somdata(bfd).file_hdr)
+#define obj_som_exec_hdr(bfd) (somdata(bfd).exec_hdr)
+#define obj_som_copyright_hdr(bfd) (somdata(bfd).copyright_aux_hdr)
+#define obj_som_version_hdr(bfd) (somdata(bfd).version_aux_hdr)
+#define obj_som_compilation_unit(bfd) (somdata(bfd).comp_unit)
+#define obj_som_symtab(bfd) (somdata(bfd).symtab)
+#define obj_som_stringtab(bfd) (somdata(bfd).stringtab)
+#define obj_som_sym_filepos(bfd) (somdata(bfd).sym_filepos)
+#define obj_som_str_filepos(bfd) (somdata(bfd).str_filepos)
+#define obj_som_stringtab_size(bfd) (somdata(bfd).stringtab_size)
+#define obj_som_reloc_filepos(bfd) (somdata(bfd).reloc_filepos)
+#define obj_som_sorted_syms(bfd) (somdata(bfd).sorted_syms)
+#define som_section_data(sec) \
+ ((struct som_section_data_struct *)sec->used_by_bfd)
+#define som_symbol_data(symbol) ((som_symbol_type *) symbol)
+
+
+/* Defines groups of basic relocations. FIXME: These should
+ be the only basic relocations created by GAS. The rest
+ should be internal to the BFD backend.
+
+ The idea is both SOM and ELF define these basic relocation
+ types so they map into a SOM or ELF specific reloation as
+ appropriate. This allows GAS to share much more code
+ between the two object formats. */
+
+#define R_HPPA_NONE R_NO_RELOCATION
+#define R_HPPA R_CODE_ONE_SYMBOL
+#define R_HPPA_PCREL_CALL R_PCREL_CALL
+#define R_HPPA_ABS_CALL R_ABS_CALL
+#define R_HPPA_GOTOFF R_DP_RELATIVE
+#define R_HPPA_ENTRY R_ENTRY
+#define R_HPPA_EXIT R_EXIT
+#define R_HPPA_COMPLEX R_COMP1
+#define R_HPPA_BEGIN_BRTAB R_BEGIN_BRTAB
+#define R_HPPA_END_BRTAB R_END_BRTAB
+#define R_HPPA_BEGIN_TRY R_BEGIN_TRY
+#define R_HPPA_END_TRY R_END_TRY
+
+/* Exported functions, mostly for use by GAS. */
+boolean bfd_som_set_section_attributes PARAMS ((asection *, int, int,
+ unsigned int, int));
+boolean bfd_som_set_subsection_attributes PARAMS ((asection *, asection *,
+ int, unsigned int, int));
+void bfd_som_set_symbol_type PARAMS ((asymbol *, unsigned int));
+boolean bfd_som_attach_aux_hdr PARAMS ((bfd *, int, char *));
+int ** hppa_som_gen_reloc_type
+ PARAMS ((bfd *, int, int, enum hppa_reloc_field_selector_type_alt,
+ int, asymbol *));
+boolean bfd_som_attach_compilation_unit
+ PARAMS ((bfd *, const char *, const char *, const char *, const char *));
+
+#endif /* _SOM_H */