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3fe22b980b
for malloc. * coff-mips.c (mips_relocate_section): Likewise, for memmove. (mips_relax_section): Likewise, for malloc. * cofflink.c (process_embedded_commands): Likewise. (_bfd_coff_final_link): Likewise. * ecoff.c (_bfd_ecoff_write_object_contents): Likewise. (ecoff_final_link_debug_accumulate): Likewise. (ecoff_indirect_link_order): Likewise, for memcpy and malloc. (ecoff_reloc_link_order): Likewise, for malloc. * ecofflink.c (ecoff_align_debug): Likewise, for memset. (ecoff_write_symhdr): Likewise, for malloc. * elf32-hppa.c (elf32_hppa_read_symext_info): Likewise. * elf.c (assign_file_positions_except_relocs): Likewise, for qsort. * elf32-mips.c (mips_elf_read_ecoff_info): Likewise, for malloc. * elfcode.h (elf_slurp_reloc_table): Likewise. * elfcore.h (elf_corefile_note): Likewise. * elflink.h (elf_link_add_object_symbols): Likewise. (elf_link_read_relocs): Likewise. (NAME(bfd_elf,size_dynamic_sections)): Likewise, for memset. * i386linux.c (bfd_linux_size_dynamic_sections): Likewise. * ieee.c (do_with_relocs): Likewise. * linker.c (default_indirect_link_order): Likewise, for malloc. * nlmcode.h (nlm_object_p): Likewise. (nlm_write_object_contents): Likewise. * oasys.c (oasys_set_section_contents): Likewise, for memcpy. * reloc.c (bfd_generic_get_relocated_section_contents): Likewise, for malloc. * section.c (bfd_get_section_contents): Likewise, for memcpy. * srec.c (srec_get_section_contents): Likewise. (srec_set_section_contents): Likewise. * sunos.c (bfd_sunos_size_dynamic_sections): Likewise, for realloc and memset. (sunos_scan_relocs): Likewise, for malloc. (sunos_scan_dynamic_symbol): Likewise, for realloc. * syms.c (_bfd_generic_read_minisymbols): Likewise, for malloc. * versados.c (versados_get_section_contents): Likewise, for memcpy.
675 lines
18 KiB
C
675 lines
18 KiB
C
/* Generic symbol-table support for the BFD library.
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Copyright (C) 1990, 1991, 1992, 1993 Free Software Foundation, Inc.
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Written by 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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/*
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SECTION
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Symbols
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BFD tries to maintain as much symbol information as it can when
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it moves information from file to file. BFD passes information
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to applications though the <<asymbol>> structure. When the
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application requests the symbol table, BFD reads the table in
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the native form and translates parts of it into the internal
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format. To maintain more than the information passed to
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applications, some targets keep some information ``behind the
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scenes'' in a structure only the particular back end knows
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about. For example, the coff back end keeps the original
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symbol table structure as well as the canonical structure when
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a BFD is read in. On output, the coff back end can reconstruct
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the output symbol table so that no information is lost, even
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information unique to coff which BFD doesn't know or
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understand. If a coff symbol table were read, but were written
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through an a.out back end, all the coff specific information
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would be lost. The symbol table of a BFD
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is not necessarily read in until a canonicalize request is
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made. Then the BFD back end fills in a table provided by the
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application with pointers to the canonical information. To
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output symbols, the application provides BFD with a table of
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pointers to pointers to <<asymbol>>s. This allows applications
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like the linker to output a symbol as it was read, since the ``behind
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the scenes'' information will be still available.
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@menu
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@* Reading Symbols::
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@* Writing Symbols::
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@* typedef asymbol::
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@* symbol handling functions::
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@end menu
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INODE
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Reading Symbols, Writing Symbols, Symbols, Symbols
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SUBSECTION
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Reading symbols
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There are two stages to reading a symbol table from a BFD:
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allocating storage, and the actual reading process. This is an
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excerpt from an application which reads the symbol table:
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| long storage_needed;
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| asymbol **symbol_table;
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| long number_of_symbols;
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| long i;
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| storage_needed = bfd_get_symtab_upper_bound (abfd);
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| if (storage_needed < 0)
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| FAIL
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| if (storage_needed == 0) {
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| return ;
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| }
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| symbol_table = (asymbol **) xmalloc (storage_needed);
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| ...
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| number_of_symbols =
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| bfd_canonicalize_symtab (abfd, symbol_table);
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| if (number_of_symbols < 0)
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| FAIL
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| for (i = 0; i < number_of_symbols; i++) {
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| process_symbol (symbol_table[i]);
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| }
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All storage for the symbols themselves is in an obstack
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connected to the BFD; it is freed when the BFD is closed.
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INODE
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Writing Symbols, Mini symbols, Reading Symbols, Symbols
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SUBSECTION
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Writing symbols
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Writing of a symbol table is automatic when a BFD open for
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writing is closed. The application attaches a vector of
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pointers to pointers to symbols to the BFD being written, and
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fills in the symbol count. The close and cleanup code reads
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through the table provided and performs all the necessary
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operations. The BFD output code must always be provided with an
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``owned'' symbol: one which has come from another BFD, or one
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which has been created using <<bfd_make_empty_symbol>>. Here is an
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example showing the creation of a symbol table with only one element:
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| #include "bfd.h"
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| main()
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| {
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| bfd *abfd;
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| asymbol *ptrs[2];
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| asymbol *new;
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| abfd = bfd_openw("foo","a.out-sunos-big");
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| bfd_set_format(abfd, bfd_object);
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| new = bfd_make_empty_symbol(abfd);
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| new->name = "dummy_symbol";
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| new->section = bfd_make_section_old_way(abfd, ".text");
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| new->flags = BSF_GLOBAL;
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| new->value = 0x12345;
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| ptrs[0] = new;
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| ptrs[1] = (asymbol *)0;
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| bfd_set_symtab(abfd, ptrs, 1);
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| bfd_close(abfd);
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| }
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| ./makesym
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| nm foo
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| 00012345 A dummy_symbol
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Many formats cannot represent arbitary symbol information; for
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instance, the <<a.out>> object format does not allow an
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arbitary number of sections. A symbol pointing to a section
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which is not one of <<.text>>, <<.data>> or <<.bss>> cannot
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be described.
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INODE
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Mini symbols, typedef asymbol, Writing Symbols, Symbols
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SUBSECTION
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Mini symbols
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Mini symbols provide read-only access to the symbol table.
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They use less memory space, but require more time to access.
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They can be useful for tools like nm or objdump, which may
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have to handle symbol tables of extremely large executables.
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The <<bfd_read_minisymbols>> function will read the symbols
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into memory in an internal form. It will return a <<void *>>
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pointer to a block of memory, a symbol count, and the size of
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each symbol. The pointer is allocated using <<malloc>>, and
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should be freed by the caller when it is no longer needed.
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The function <<bfd_minisymbol_to_symbol>> will take a pointer
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to a minisymbol, and a pointer to a structure returned by
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<<bfd_make_empty_symbol>>, and return a <<asymbol>> structure.
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The return value may or may not be the same as the value from
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<<bfd_make_empty_symbol>> which was passed in.
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*/
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/*
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DOCDD
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INODE
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typedef asymbol, symbol handling functions, Mini symbols, Symbols
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*/
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/*
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SUBSECTION
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typedef asymbol
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An <<asymbol>> has the form:
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*/
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/*
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CODE_FRAGMENT
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.
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.typedef struct symbol_cache_entry
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.{
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. {* A pointer to the BFD which owns the symbol. This information
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. is necessary so that a back end can work out what additional
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. information (invisible to the application writer) is carried
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. with the symbol.
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.
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. This field is *almost* redundant, since you can use section->owner
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. instead, except that some symbols point to the global sections
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. bfd_{abs,com,und}_section. This could be fixed by making
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. these globals be per-bfd (or per-target-flavor). FIXME. *}
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.
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. struct _bfd *the_bfd; {* Use bfd_asymbol_bfd(sym) to access this field. *}
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.
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. {* The text of the symbol. The name is left alone, and not copied; the
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. application may not alter it. *}
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. CONST char *name;
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.
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. {* The value of the symbol. This really should be a union of a
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. numeric value with a pointer, since some flags indicate that
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. a pointer to another symbol is stored here. *}
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. symvalue value;
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.
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. {* Attributes of a symbol: *}
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.
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.#define BSF_NO_FLAGS 0x00
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.
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. {* The symbol has local scope; <<static>> in <<C>>. The value
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. is the offset into the section of the data. *}
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.#define BSF_LOCAL 0x01
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.
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. {* The symbol has global scope; initialized data in <<C>>. The
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. value is the offset into the section of the data. *}
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.#define BSF_GLOBAL 0x02
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.
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. {* The symbol has global scope and is exported. The value is
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. the offset into the section of the data. *}
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.#define BSF_EXPORT BSF_GLOBAL {* no real difference *}
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.
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. {* A normal C symbol would be one of:
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. <<BSF_LOCAL>>, <<BSF_FORT_COMM>>, <<BSF_UNDEFINED>> or
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. <<BSF_GLOBAL>> *}
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.
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. {* The symbol is a debugging record. The value has an arbitary
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. meaning. *}
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.#define BSF_DEBUGGING 0x08
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.
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. {* The symbol denotes a function entry point. Used in ELF,
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. perhaps others someday. *}
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.#define BSF_FUNCTION 0x10
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.
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. {* Used by the linker. *}
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.#define BSF_KEEP 0x20
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.#define BSF_KEEP_G 0x40
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.
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. {* A weak global symbol, overridable without warnings by
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. a regular global symbol of the same name. *}
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.#define BSF_WEAK 0x80
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.
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. {* This symbol was created to point to a section, e.g. ELF's
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. STT_SECTION symbols. *}
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.#define BSF_SECTION_SYM 0x100
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.
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. {* The symbol used to be a common symbol, but now it is
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. allocated. *}
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.#define BSF_OLD_COMMON 0x200
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.
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. {* The default value for common data. *}
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.#define BFD_FORT_COMM_DEFAULT_VALUE 0
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.
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. {* In some files the type of a symbol sometimes alters its
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. location in an output file - ie in coff a <<ISFCN>> symbol
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. which is also <<C_EXT>> symbol appears where it was
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. declared and not at the end of a section. This bit is set
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. by the target BFD part to convey this information. *}
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.
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.#define BSF_NOT_AT_END 0x400
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.
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. {* Signal that the symbol is the label of constructor section. *}
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.#define BSF_CONSTRUCTOR 0x800
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.
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. {* Signal that the symbol is a warning symbol. If the symbol
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. is a warning symbol, then the value field (I know this is
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. tacky) will point to the asymbol which when referenced will
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. cause the warning. *}
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.#define BSF_WARNING 0x1000
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.
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. {* Signal that the symbol is indirect. The value of the symbol
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. is a pointer to an undefined asymbol which contains the
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. name to use instead. *}
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.#define BSF_INDIRECT 0x2000
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.
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. {* BSF_FILE marks symbols that contain a file name. This is used
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. for ELF STT_FILE symbols. *}
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.#define BSF_FILE 0x4000
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.
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. {* Symbol is from dynamic linking information. *}
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.#define BSF_DYNAMIC 0x8000
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.
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. flagword flags;
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.
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. {* A pointer to the section to which this symbol is
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. relative. This will always be non NULL, there are special
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. sections for undefined and absolute symbols. *}
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. struct sec *section;
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.
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. {* Back end special data. *}
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. union
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. {
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. PTR p;
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. bfd_vma i;
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. } udata;
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.
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.} asymbol;
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*/
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#include "bfd.h"
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#include "sysdep.h"
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#include "libbfd.h"
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#include "aout/stab_gnu.h"
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/*
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DOCDD
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INODE
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symbol handling functions, , typedef asymbol, Symbols
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SUBSECTION
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Symbol handling functions
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*/
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/*
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FUNCTION
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bfd_get_symtab_upper_bound
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DESCRIPTION
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Return the number of bytes required to store a vector of pointers
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to <<asymbols>> for all the symbols in the BFD @var{abfd},
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including a terminal NULL pointer. If there are no symbols in
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the BFD, then return 0. If an error occurs, return -1.
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.#define bfd_get_symtab_upper_bound(abfd) \
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. BFD_SEND (abfd, _bfd_get_symtab_upper_bound, (abfd))
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*/
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/*
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FUNCTION
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bfd_is_local_label
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SYNOPSIS
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boolean bfd_is_local_label(bfd *abfd, asymbol *sym);
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DESCRIPTION
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Return true if the given symbol @var{sym} in the BFD @var{abfd} is
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a compiler generated local label, else return false.
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.#define bfd_is_local_label(abfd, sym) \
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. BFD_SEND (abfd, _bfd_is_local_label,(abfd, sym))
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*/
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/*
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FUNCTION
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bfd_canonicalize_symtab
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DESCRIPTION
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Read the symbols from the BFD @var{abfd}, and fills in
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the vector @var{location} with pointers to the symbols and
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a trailing NULL.
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Return the actual number of symbol pointers, not
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including the NULL.
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.#define bfd_canonicalize_symtab(abfd, location) \
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. BFD_SEND (abfd, _bfd_canonicalize_symtab,\
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. (abfd, location))
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*/
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/*
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FUNCTION
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bfd_set_symtab
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SYNOPSIS
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boolean bfd_set_symtab (bfd *abfd, asymbol **location, unsigned int count);
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DESCRIPTION
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Arrange that when the output BFD @var{abfd} is closed,
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the table @var{location} of @var{count} pointers to symbols
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will be written.
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*/
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boolean
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bfd_set_symtab (abfd, location, symcount)
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bfd *abfd;
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asymbol **location;
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unsigned int symcount;
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{
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if ((abfd->format != bfd_object) || (bfd_read_p (abfd)))
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{
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bfd_set_error (bfd_error_invalid_operation);
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return false;
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}
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bfd_get_outsymbols (abfd) = location;
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bfd_get_symcount (abfd) = symcount;
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return true;
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}
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/*
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FUNCTION
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bfd_print_symbol_vandf
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SYNOPSIS
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void bfd_print_symbol_vandf(PTR file, asymbol *symbol);
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DESCRIPTION
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Print the value and flags of the @var{symbol} supplied to the
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stream @var{file}.
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*/
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void
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bfd_print_symbol_vandf (arg, symbol)
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PTR arg;
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asymbol *symbol;
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{
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FILE *file = (FILE *) arg;
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flagword type = symbol->flags;
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if (symbol->section != (asection *) NULL)
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{
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fprintf_vma (file, symbol->value + symbol->section->vma);
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}
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else
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{
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fprintf_vma (file, symbol->value);
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}
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/* This presumes that a symbol can not be both BSF_DEBUGGING and
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BSF_DYNAMIC, nor both BSF_FUNCTION and BSF_FILE. */
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fprintf (file, " %c%c%c%c%c%c%c",
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((type & BSF_LOCAL)
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? (type & BSF_GLOBAL) ? '!' : 'l'
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: (type & BSF_GLOBAL) ? 'g' : ' '),
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(type & BSF_WEAK) ? 'w' : ' ',
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(type & BSF_CONSTRUCTOR) ? 'C' : ' ',
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(type & BSF_WARNING) ? 'W' : ' ',
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(type & BSF_INDIRECT) ? 'I' : ' ',
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(type & BSF_DEBUGGING) ? 'd' : (type & BSF_DYNAMIC) ? 'D' : ' ',
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(type & BSF_FUNCTION) ? 'F' : (type & BSF_FILE) ? 'f' : ' ');
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}
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/*
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FUNCTION
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bfd_make_empty_symbol
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DESCRIPTION
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Create a new <<asymbol>> structure for the BFD @var{abfd}
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and return a pointer to it.
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This routine is necessary because each back end has private
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information surrounding the <<asymbol>>. Building your own
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<<asymbol>> and pointing to it will not create the private
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information, and will cause problems later on.
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.#define bfd_make_empty_symbol(abfd) \
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. BFD_SEND (abfd, _bfd_make_empty_symbol, (abfd))
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*/
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/*
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FUNCTION
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bfd_make_debug_symbol
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DESCRIPTION
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Create a new <<asymbol>> structure for the BFD @var{abfd},
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to be used as a debugging symbol. Further details of its use have
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yet to be worked out.
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.#define bfd_make_debug_symbol(abfd,ptr,size) \
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. BFD_SEND (abfd, _bfd_make_debug_symbol, (abfd, ptr, size))
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*/
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struct section_to_type
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{
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CONST char *section;
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char type;
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};
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/* Map section names to POSIX/BSD single-character symbol types.
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This table is probably incomplete. It is sorted for convenience of
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adding entries. Since it is so short, a linear search is used. */
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static CONST struct section_to_type stt[] =
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{
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{"*DEBUG*", 'N'},
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{".bss", 'b'},
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{".data", 'd'},
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|
{".rdata", 'r'}, /* Read only data. */
|
|
{".rodata", 'r'}, /* Read only data. */
|
|
{".sbss", 's'}, /* Small BSS (uninitialized data). */
|
|
{".scommon", 'c'}, /* Small common. */
|
|
{".sdata", 'g'}, /* Small initialized data. */
|
|
{".text", 't'},
|
|
{0, 0}
|
|
};
|
|
|
|
/* Return the single-character symbol type corresponding to
|
|
section S, or '?' for an unknown COFF section.
|
|
|
|
Check for any leading string which matches, so .text5 returns
|
|
't' as well as .text */
|
|
|
|
static char
|
|
coff_section_type (s)
|
|
char *s;
|
|
{
|
|
CONST struct section_to_type *t;
|
|
|
|
for (t = &stt[0]; t->section; t++)
|
|
if (!strncmp (s, t->section, strlen (t->section)))
|
|
return t->type;
|
|
|
|
return '?';
|
|
}
|
|
|
|
#ifndef islower
|
|
#define islower(c) ((c) >= 'a' && (c) <= 'z')
|
|
#endif
|
|
#ifndef toupper
|
|
#define toupper(c) (islower(c) ? ((c) & ~0x20) : (c))
|
|
#endif
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_decode_symclass
|
|
|
|
DESCRIPTION
|
|
Return a character corresponding to the symbol
|
|
class of @var{symbol}, or '?' for an unknown class.
|
|
|
|
SYNOPSIS
|
|
int bfd_decode_symclass(asymbol *symbol);
|
|
*/
|
|
int
|
|
bfd_decode_symclass (symbol)
|
|
asymbol *symbol;
|
|
{
|
|
char c;
|
|
|
|
if (bfd_is_com_section (symbol->section))
|
|
return 'C';
|
|
if (bfd_is_und_section (symbol->section))
|
|
return 'U';
|
|
if (bfd_is_ind_section (symbol->section))
|
|
return 'I';
|
|
if (symbol->flags & BSF_WEAK)
|
|
return 'W';
|
|
if (!(symbol->flags & (BSF_GLOBAL | BSF_LOCAL)))
|
|
return '?';
|
|
|
|
if (bfd_is_abs_section (symbol->section))
|
|
c = 'a';
|
|
else if (symbol->section)
|
|
c = coff_section_type (symbol->section->name);
|
|
else
|
|
return '?';
|
|
if (symbol->flags & BSF_GLOBAL)
|
|
c = toupper (c);
|
|
return c;
|
|
|
|
/* We don't have to handle these cases just yet, but we will soon:
|
|
N_SETV: 'v';
|
|
N_SETA: 'l';
|
|
N_SETT: 'x';
|
|
N_SETD: 'z';
|
|
N_SETB: 's';
|
|
N_INDR: 'i';
|
|
*/
|
|
}
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_symbol_info
|
|
|
|
DESCRIPTION
|
|
Fill in the basic info about symbol that nm needs.
|
|
Additional info may be added by the back-ends after
|
|
calling this function.
|
|
|
|
SYNOPSIS
|
|
void bfd_symbol_info(asymbol *symbol, symbol_info *ret);
|
|
*/
|
|
|
|
void
|
|
bfd_symbol_info (symbol, ret)
|
|
asymbol *symbol;
|
|
symbol_info *ret;
|
|
{
|
|
ret->type = bfd_decode_symclass (symbol);
|
|
if (ret->type != 'U')
|
|
ret->value = symbol->value + symbol->section->vma;
|
|
else
|
|
ret->value = 0;
|
|
ret->name = symbol->name;
|
|
}
|
|
|
|
void
|
|
bfd_symbol_is_absolute ()
|
|
{
|
|
abort ();
|
|
}
|
|
|
|
/*
|
|
FUNCTION
|
|
bfd_copy_private_symbol_data
|
|
|
|
SYNOPSIS
|
|
boolean bfd_copy_private_symbol_data(bfd *ibfd, asymbol *isym, bfd *obfd, asymbol *osym);
|
|
|
|
DESCRIPTION
|
|
Copy private symbol information from @var{isym} in the BFD
|
|
@var{ibfd} to the symbol @var{osym} in the BFD @var{obfd}.
|
|
Return <<true>> on success, <<false>> on error. Possible error
|
|
returns are:
|
|
|
|
o <<bfd_error_no_memory>> -
|
|
Not enough memory exists to create private data for @var{osec}.
|
|
|
|
.#define bfd_copy_private_symbol_data(ibfd, isymbol, obfd, osymbol) \
|
|
. BFD_SEND (ibfd, _bfd_copy_private_symbol_data, \
|
|
. (ibfd, isymbol, obfd, osymbol))
|
|
|
|
*/
|
|
|
|
/* The generic version of the function which returns mini symbols.
|
|
This is used when the backend does not provide a more efficient
|
|
version. It just uses BFD asymbol structures as mini symbols. */
|
|
|
|
long
|
|
_bfd_generic_read_minisymbols (abfd, dynamic, minisymsp, sizep)
|
|
bfd *abfd;
|
|
boolean dynamic;
|
|
PTR *minisymsp;
|
|
unsigned int *sizep;
|
|
{
|
|
long storage;
|
|
asymbol **syms = NULL;
|
|
long symcount;
|
|
|
|
if (dynamic)
|
|
storage = bfd_get_dynamic_symtab_upper_bound (abfd);
|
|
else
|
|
storage = bfd_get_symtab_upper_bound (abfd);
|
|
if (storage < 0)
|
|
goto error_return;
|
|
|
|
syms = (asymbol **) malloc ((size_t) storage);
|
|
if (syms == NULL)
|
|
{
|
|
bfd_set_error (bfd_error_no_memory);
|
|
goto error_return;
|
|
}
|
|
|
|
if (dynamic)
|
|
symcount = bfd_canonicalize_dynamic_symtab (abfd, syms);
|
|
else
|
|
symcount = bfd_canonicalize_symtab (abfd, syms);
|
|
if (symcount < 0)
|
|
goto error_return;
|
|
|
|
*minisymsp = (PTR) syms;
|
|
*sizep = sizeof (asymbol *);
|
|
return symcount;
|
|
|
|
error_return:
|
|
if (syms != NULL)
|
|
free (syms);
|
|
return -1;
|
|
}
|
|
|
|
/* The generic version of the function which converts a minisymbol to
|
|
an asymbol. We don't worry about the sym argument we are passed;
|
|
we just return the asymbol the minisymbol points to. */
|
|
|
|
/*ARGSUSED*/
|
|
asymbol *
|
|
_bfd_generic_minisymbol_to_symbol (abfd, dynamic, minisym, sym)
|
|
bfd *abfd;
|
|
boolean dynamic;
|
|
const PTR minisym;
|
|
asymbol *sym;
|
|
{
|
|
return *(asymbol **) minisym;
|
|
}
|