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b73ffa23bf
Code in som_write_symbol_strings neglected to allow for padding, which can result in a buffer overflow. It also used xrealloc, which we're not supposed to use in libbfd because libbfd isn't supposed to call exit. Also a realloc is perhaps not a good idea when none of the buffer contents are needed, so replace with free, bfd_malloc. There were three copies of the string handling code, so rather than fix them all I've extracted them to a function. This necessitated making one of the fields in struct som_symbol unsigned. * som.c (add_string): New function. (som_write_space_strings, som_write_symbol_strings): Use it. * som.h (som_symbol_type <stringtab_offset>): Make unsigned.
256 lines
8.6 KiB
C
256 lines
8.6 KiB
C
/* HP PA-RISC SOM object file format: definitions internal to BFD.
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Copyright (C) 1990-2023 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 3 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., 51 Franklin Street - Fifth Floor, Boston, MA
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02110-1301, USA. */
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#ifndef _SOM_H
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#define _SOM_H
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#include "libhppa.h"
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/* We want reloc.h to provide PA 2.0 defines. */
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#define PA_2_0
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#include "som/aout.h"
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#include "som/lst.h"
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#include "som/internal.h"
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/* The SOM BFD backend doesn't currently use anything from these
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two include files, but it's likely to need them in the future. */
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#ifdef R_DLT_REL
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#include <shl.h>
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#include <dl.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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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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typedef struct som_symbol
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{
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asymbol symbol;
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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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struct
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{
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unsigned int hppa_arg_reloc;
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unsigned int hppa_priv_level;
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} ap;
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void * 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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/* During object file writing, the offset of the name of this symbol
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in the SOM string table. */
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unsigned int stringtab_offset;
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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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/* We must preserve the version identifier too. Some versions
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of the HP linker do not grok NEW_VERSION_ID for reasons unknown. */
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unsigned int version_id;
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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 an 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 som_header *file_hdr;
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struct som_string_auxhdr *copyright_aux_hdr;
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struct som_string_auxhdr *version_aux_hdr;
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struct som_exec_auxhdr *exec_hdr;
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struct som_compilation_unit *comp_unit;
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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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asymbol **sorted_syms;
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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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void * line_info;
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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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/* Substructure of som_section_data_struct used to hold information
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which can't be represented by the generic BFD section structure,
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but which must be copied during objcopy or strip. */
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struct som_copyable_section_data_struct
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{
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/* Various fields in space and subspace headers that we need
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to pass around. */
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unsigned int sort_key : 8;
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unsigned int access_control_bits : 7;
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unsigned int is_defined : 1;
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unsigned int is_private : 1;
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unsigned int quadrant : 2;
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unsigned int is_comdat : 1;
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unsigned int is_common : 1;
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unsigned int dup_common : 1;
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/* For subspaces, this points to the section which represents the
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space in which the subspace is contained. For spaces it points
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back to the section for this space. */
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asection *container;
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/* The user-specified space number. It is wrong to use this as
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an index since duplicates and holes are allowed. */
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int space_number;
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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 initialization pointers,
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and the many subspace flags we do not represent yet. */
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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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struct som_section_data_struct
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{
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struct som_copyable_section_data_struct *copy_data;
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unsigned int reloc_size;
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unsigned char *reloc_stream;
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struct som_space_dictionary_record *space_dict;
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struct som_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_exec_hdr(bfd) (somdata (bfd).exec_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_compilation_unit(bfd) (somdata (bfd).comp_unit)
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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 obj_som_sorted_syms(bfd) (somdata (bfd).sorted_syms)
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#define som_section_data(sec) ((struct som_section_data_struct *) sec->used_by_bfd)
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#define som_symbol_data(symbol) ((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 relocation 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_PCREL_CALL R_PCREL_CALL
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#define R_HPPA_ABS_CALL R_ABS_CALL
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#define R_HPPA_GOTOFF R_DP_RELATIVE
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#define R_HPPA_ENTRY R_ENTRY
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#define R_HPPA_EXIT R_EXIT
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#define R_HPPA_COMPLEX R_COMP1
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#define R_HPPA_BEGIN_BRTAB R_BEGIN_BRTAB
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#define R_HPPA_END_BRTAB R_END_BRTAB
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#define R_HPPA_BEGIN_TRY R_BEGIN_TRY
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#define R_HPPA_END_TRY R_END_TRY
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#define som_find_nearest_line_with_alt \
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_bfd_nosymbols_find_nearest_line_with_alt
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/* Exported functions, mostly for use by GAS. */
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bool bfd_som_set_section_attributes
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(asection *, int, int, unsigned int, int);
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bool bfd_som_set_subsection_attributes
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(asection *, asection *, int, unsigned int, int, int, int, int);
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void bfd_som_set_symbol_type
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(asymbol *, unsigned int);
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bool bfd_som_attach_aux_hdr
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(bfd *, int, char *);
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int **hppa_som_gen_reloc_type
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(bfd *, int, int, enum hppa_reloc_field_selector_type_alt, int, asymbol *);
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bool bfd_som_attach_compilation_unit
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(bfd *, const char *, const char *, const char *, const char *);
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asection *bfd_section_from_som_symbol
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(bfd *abfd, struct som_external_symbol_dictionary_record *symbol);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _SOM_H */
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