4359a7ef33
info that must be preserved when running objcopy/strip. (struct somdata): Add new "exec_data" field and accessor macro. Add some comments on how the various fields are used. (som_section_data_struct): Make is_space and is_subspace bitfields. Delete unused subspace_index. All references now use the target_index field within the section structure itself. * som.c (make_unique_section): Delete unused declaration. (som_bfd_copy_private_bfd_data): New function. (som_object_setup): Allocate space for and save exec information that needs to be copied during objcopy/strip. (som_mkobject): Do not allocate space for a file header here. It is not used when only reading SOM objects. (som_prep_headers): Allocate space for and attach a file header to the output bfd. For executables, use the saved system_id value rather than trying to guess the right value. Do not abort wwhen setting file_hdr->entry* for executables. (som_begin_writing): For executables, set the exec_entry and exec_flags fields. (som_copy_private_backend_section_data): Always return a value.
200 lines
7 KiB
C
200 lines
7 KiB
C
/* HP PA-RISC SOM object file format: definitions internal to BFD.
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Copyright (C) 1990, 91, 92, 93, 94 Free Software Foundation, Inc.
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Contributed by the Center for Software Science at the
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University of Utah (pa-gdb-bugs@cs.utah.edu).
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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., 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifndef _SOM_H
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#define _SOM_H
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#include "../bfd/sysdep.h"
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#include "libhppa.h"
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#include <a.out.h>
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#include <lst.h>
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#include <ar.h>
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#if defined(HOST_HPPABSD) || defined (HOST_HPPAOSF)
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/* BSD uses a completely different scheme for object file identification.
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so for now, define _PA_RISC_ID to accept any random value for a model
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number. */
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#undef _PA_RISC_ID
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#define _PA_RISC_ID(__m_num) 1
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#endif /* HOST_HPPABSD */
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#define FILE_HDR_SIZE sizeof(struct header)
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#define AUX_HDR_SIZE sizeof(struct som_exec_auxhdr)
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typedef struct som_symbol
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{
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asymbol symbol;
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short desc;
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char other;
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unsigned char type;
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unsigned int som_type;
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/* Structured like the ELF tc_data union. Allows more code sharing
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in GAS this way. */
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union
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{
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unsigned int hppa_arg_reloc;
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PTR any;
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}
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tc_data;
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/* Index of this symbol in the symbol table. Only used when
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building relocation streams for incomplete objects. */
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int index;
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/* How many times this symbol is used in a relocation. By sorting
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the symbols from most used to least used we can significantly
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reduce the size of the relocation stream for incomplete objects. */
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int reloc_count;
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/* The unwind descriptor bits associated with R_ENTRY relocations
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for functions (not enough room in a BFD reloc to store all the
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information, so we tack it onto the symbol associated with the
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function. */
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char *unwind;
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}
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som_symbol_type;
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/* A structure containing all the magic information stored in a BFD's
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private data which needs to be copied during an objcopy/strip run. */
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struct som_exec_data
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{
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/* Sort-of a magic number. BSD uses it to distinguish between
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native executables and hpux executables. */
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short system_id;
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/* Magic exec flags. These control things like whether or not
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null pointer dereferencing is allowed and the like. */
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long exec_flags;
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/* Add more stuff here as needed. Good examples of information
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we might want to pass would be presumed_dp, entry_* and maybe
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others from the file header. */
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};
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struct somdata
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{
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/* All the magic information about an executable which lives
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in the private BFD structure and needs to be copied from
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the input bfd to the output bfd during a objcopy/strip. */
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struct som_exec_data *exec_data;
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/* These three fields are only used when writing files and are
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generated from scratch. They need not be copied for objcopy
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or strip to work. */
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struct header *file_hdr;
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struct copyright_aux_hdr *copyright_aux_hdr;
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struct user_string_aux_hdr *version_aux_hdr;
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/* Pointers to a saved copy of the symbol and string tables. These
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need not be copied for objcopy or strip to work. */
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som_symbol_type *symtab;
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char *stringtab;
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/* We remember these offsets so that after check_file_format, we have
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no dependencies on the particular format of the exec_hdr.
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These offsets need not be copied for objcopy or strip to work. */
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file_ptr sym_filepos;
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file_ptr str_filepos;
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file_ptr reloc_filepos;
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unsigned stringtab_size;
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};
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struct som_data_struct
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{
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struct somdata a;
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};
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/* Used to keep extra SOM specific information for a given section.
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reloc_size holds the size of the relocation stream, note this
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is very different from the number of relocations as SOM relocations
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are variable length.
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reloc_stream is the actual stream of relocation entries.
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The BFD section index may not exactly match a SOM subspace index,
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for this reason we keep track of the original SOM subspace index
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when a subspace is turned into a BFD section. */
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struct som_section_data_struct
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{
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unsigned int is_space : 1;
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unsigned int is_subspace : 1;
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unsigned int reloc_size;
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char *reloc_stream;
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asection *containing_space;
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struct space_dictionary_record space_dict;
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struct subspace_dictionary_record subspace_dict;
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};
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#define somdata(bfd) ((bfd)->tdata.som_data->a)
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#define obj_som_exec_data(bfd) (somdata(bfd).exec_data)
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#define obj_som_file_hdr(bfd) (somdata(bfd).file_hdr)
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#define obj_som_copyright_hdr(bfd) (somdata(bfd).copyright_aux_hdr)
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#define obj_som_version_hdr(bfd) (somdata(bfd).version_aux_hdr)
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#define obj_som_symtab(bfd) (somdata(bfd).symtab)
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#define obj_som_stringtab(bfd) (somdata(bfd).stringtab)
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#define obj_som_sym_filepos(bfd) (somdata(bfd).sym_filepos)
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#define obj_som_str_filepos(bfd) (somdata(bfd).str_filepos)
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#define obj_som_stringtab_size(bfd) (somdata(bfd).stringtab_size)
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#define obj_som_reloc_filepos(bfd) (somdata(bfd).reloc_filepos)
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#define som_section_data(sec) \
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((struct som_section_data_struct *)sec->used_by_bfd)
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#define som_symbol_data(symbol) \
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((som_symbol_type *) symbol)
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/* Defines groups of basic relocations. FIXME: These should
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be the only basic relocations created by GAS. The rest
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should be internal to the BFD backend.
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The idea is both SOM and ELF define these basic relocation
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types so they map into a SOM or ELF specific reloation as
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appropriate. This allows GAS to share much more code
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between the two object formats. */
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#define R_HPPA_NONE R_NO_RELOCATION
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#define R_HPPA R_CODE_ONE_SYMBOL
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#define R_HPPA_ABS_CALL R_ABS_CALL
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#define R_HPPA_PCREL_CALL R_PCREL_CALL
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#define R_HPPA_GOTOFF R_DP_RELATIVE
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#define R_HPPA_COMPLEX R_COMP1
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#define R_HPPA_COMPLEX_PCREL_CALL R_COMP2
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#define R_HPPA_COMPLEX_ABS_CALL R_COMP3
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#define R_HPPA_ENTRY R_ENTRY
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#define R_HPPA_EXIT R_EXIT
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/* Exported functions, mostly for use by GAS. */
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void bfd_som_set_section_attributes PARAMS ((asection *, int, int,
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unsigned int, int));
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void bfd_som_set_subsection_attributes PARAMS ((asection *, asection *,
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int, unsigned int, int));
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void bfd_som_set_symbol_type PARAMS ((asymbol *, unsigned int));
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void bfd_som_attach_unwind_info PARAMS ((asymbol *, char *));
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boolean bfd_som_attach_aux_hdr PARAMS ((bfd *, int, char *));
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int ** hppa_som_gen_reloc_type
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PARAMS ((bfd *, int, int, enum hppa_reloc_field_selector_type_alt));
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#endif /* _SOM_H */
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