d3bb4185d0
fully registered. (This is the second try, the first import ignored .info files but not .info-* files, for some reason. I'm going to make this consistent.) Reviewed by: core Approved for: 2.2
1085 lines
29 KiB
C
1085 lines
29 KiB
C
/* Generic symbol-table support for the BFD library.
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Copyright (C) 1990, 91, 92, 93, 94, 95, 1996 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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@* Mini 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. The name is a
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. warning. The name of the next symbol is the one to warn about;
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. if a reference is made to a symbol with the same name as the next
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. symbol, a warning is issued by the linker. *}
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.#define BSF_WARNING 0x1000
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.
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. {* Signal that the symbol is indirect. This symbol is an indirect
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. pointer to the symbol with the same name as the next symbol. *}
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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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. {* The symbol denotes a data object. Used in ELF, and perhaps
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. others someday. *}
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.#define BSF_OBJECT 0x10000
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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 "bfdlink.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 more than one of BSF_FUNCTION, BSF_FILE, and
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BSF_OBJECT. */
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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)
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? 'F'
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: ((type & BSF_FILE)
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? 'f'
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: ((type & BSF_OBJECT) ? 'O' : ' '))));
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}
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|
|
|
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/*
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FUNCTION
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bfd_make_empty_symbol
|
|
|
|
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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|
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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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|
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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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/*
|
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FUNCTION
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bfd_make_debug_symbol
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|
|
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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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|
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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
|
|
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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{"zerovars", 'b'}, /* MRI .bss */
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{".data", 'd'},
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{"vars", 'd'}, /* MRI .data */
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{".rdata", 'r'}, /* Read only data. */
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{".rodata", 'r'}, /* Read only data. */
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{".sbss", 's'}, /* Small BSS (uninitialized data). */
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{".scommon", 'c'}, /* Small common. */
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{".sdata", 'g'}, /* Small initialized data. */
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{".text", 't'},
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{"code", 't'}, /* MRI .text */
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{0, 0}
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};
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|
|
/* Return the single-character symbol type corresponding to
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section S, or '?' for an unknown COFF section.
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|
|
|
Check for any leading string which matches, so .text5 returns
|
|
't' as well as .text */
|
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|
|
static char
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coff_section_type (s)
|
|
char *s;
|
|
{
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|
CONST struct section_to_type *t;
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|
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for (t = &stt[0]; t->section; t++)
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|
if (!strncmp (s, t->section, strlen (t->section)))
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return t->type;
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|
|
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 **) bfd_malloc ((size_t) storage);
|
|
if (syms == NULL)
|
|
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;
|
|
}
|
|
|
|
/* Look through stabs debugging information in .stab and .stabstr
|
|
sections to find the source file and line closest to a desired
|
|
location. This is used by COFF and ELF targets. It sets *pfound
|
|
to true if it finds some information. The *pinfo field is used to
|
|
pass cached information in and out of this routine; this first time
|
|
the routine is called for a BFD, *pinfo should be NULL. The value
|
|
placed in *pinfo should be saved with the BFD, and passed back each
|
|
time this function is called. */
|
|
|
|
/* A pointer to this structure is stored in *pinfo. */
|
|
|
|
struct stab_find_info
|
|
{
|
|
/* The .stab section. */
|
|
asection *stabsec;
|
|
/* The .stabstr section. */
|
|
asection *strsec;
|
|
/* The contents of the .stab section. */
|
|
bfd_byte *stabs;
|
|
/* The contents of the .stabstr section. */
|
|
bfd_byte *strs;
|
|
/* An malloc buffer to hold the file name. */
|
|
char *filename;
|
|
/* Cached values to restart quickly. */
|
|
bfd_vma cached_offset;
|
|
bfd_byte *cached_stab;
|
|
bfd_byte *cached_str;
|
|
bfd_size_type cached_stroff;
|
|
};
|
|
|
|
boolean
|
|
_bfd_stab_section_find_nearest_line (abfd, symbols, section, offset, pfound,
|
|
pfilename, pfnname, pline, pinfo)
|
|
bfd *abfd;
|
|
asymbol **symbols;
|
|
asection *section;
|
|
bfd_vma offset;
|
|
boolean *pfound;
|
|
const char **pfilename;
|
|
const char **pfnname;
|
|
unsigned int *pline;
|
|
PTR *pinfo;
|
|
{
|
|
struct stab_find_info *info;
|
|
bfd_size_type stabsize, strsize;
|
|
bfd_byte *stab, *stabend, *str;
|
|
bfd_size_type stroff;
|
|
bfd_vma fnaddr;
|
|
char *directory_name, *main_file_name, *current_file_name, *line_file_name;
|
|
char *fnname;
|
|
bfd_vma low_func_vma, low_line_vma;
|
|
|
|
*pfound = false;
|
|
*pfilename = bfd_get_filename (abfd);
|
|
*pfnname = NULL;
|
|
*pline = 0;
|
|
|
|
info = (struct stab_find_info *) *pinfo;
|
|
if (info != NULL)
|
|
{
|
|
if (info->stabsec == NULL || info->strsec == NULL)
|
|
{
|
|
/* No stabs debugging information. */
|
|
return true;
|
|
}
|
|
|
|
stabsize = info->stabsec->_raw_size;
|
|
strsize = info->strsec->_raw_size;
|
|
}
|
|
else
|
|
{
|
|
long reloc_size, reloc_count;
|
|
arelent **reloc_vector;
|
|
|
|
info = (struct stab_find_info *) bfd_zalloc (abfd, sizeof *info);
|
|
if (info == NULL)
|
|
return false;
|
|
|
|
/* FIXME: When using the linker --split-by-file or
|
|
--split-by-reloc options, it is possible for the .stab and
|
|
.stabstr sections to be split. We should handle that. */
|
|
|
|
info->stabsec = bfd_get_section_by_name (abfd, ".stab");
|
|
info->strsec = bfd_get_section_by_name (abfd, ".stabstr");
|
|
|
|
if (info->stabsec == NULL || info->strsec == NULL)
|
|
{
|
|
/* No stabs debugging information. Set *pinfo so that we
|
|
can return quickly in the info != NULL case above. */
|
|
*pinfo = (PTR) info;
|
|
return true;
|
|
}
|
|
|
|
stabsize = info->stabsec->_raw_size;
|
|
strsize = info->strsec->_raw_size;
|
|
|
|
info->stabs = (bfd_byte *) bfd_alloc (abfd, stabsize);
|
|
info->strs = (bfd_byte *) bfd_alloc (abfd, strsize);
|
|
if (info->stabs == NULL || info->strs == NULL)
|
|
return false;
|
|
|
|
if (! bfd_get_section_contents (abfd, info->stabsec, info->stabs, 0,
|
|
stabsize)
|
|
|| ! bfd_get_section_contents (abfd, info->strsec, info->strs, 0,
|
|
strsize))
|
|
return false;
|
|
|
|
/* If this is a relocateable object file, we have to relocate
|
|
the entries in .stab. This should always be simple 32 bit
|
|
relocations against symbols defined in this object file, so
|
|
this should be no big deal. */
|
|
reloc_size = bfd_get_reloc_upper_bound (abfd, info->stabsec);
|
|
if (reloc_size < 0)
|
|
return false;
|
|
reloc_vector = (arelent **) bfd_malloc (reloc_size);
|
|
if (reloc_vector == NULL && reloc_size != 0)
|
|
return false;
|
|
reloc_count = bfd_canonicalize_reloc (abfd, info->stabsec, reloc_vector,
|
|
symbols);
|
|
if (reloc_count < 0)
|
|
{
|
|
if (reloc_vector != NULL)
|
|
free (reloc_vector);
|
|
return false;
|
|
}
|
|
if (reloc_count > 0)
|
|
{
|
|
arelent **pr;
|
|
|
|
for (pr = reloc_vector; *pr != NULL; pr++)
|
|
{
|
|
arelent *r;
|
|
unsigned long val;
|
|
asymbol *sym;
|
|
|
|
r = *pr;
|
|
if (r->howto->rightshift != 0
|
|
|| r->howto->size != 2
|
|
|| r->howto->bitsize != 32
|
|
|| r->howto->pc_relative
|
|
|| r->howto->bitpos != 0
|
|
|| r->howto->dst_mask != 0xffffffff)
|
|
{
|
|
(*_bfd_error_handler)
|
|
("Unsupported .stab relocation");
|
|
bfd_set_error (bfd_error_invalid_operation);
|
|
if (reloc_vector != NULL)
|
|
free (reloc_vector);
|
|
return false;
|
|
}
|
|
|
|
val = bfd_get_32 (abfd, info->stabs + r->address);
|
|
val &= r->howto->src_mask;
|
|
sym = *r->sym_ptr_ptr;
|
|
val += sym->value + sym->section->vma + r->addend;
|
|
bfd_put_32 (abfd, val, info->stabs + r->address);
|
|
}
|
|
}
|
|
|
|
if (reloc_vector != NULL)
|
|
free (reloc_vector);
|
|
|
|
*pinfo = (PTR) info;
|
|
}
|
|
|
|
/* We are passed a section relative offset. The offsets in the
|
|
stabs information are absolute. */
|
|
offset += bfd_get_section_vma (abfd, section);
|
|
|
|
/* Stabs entries use a 12 byte format:
|
|
4 byte string table index
|
|
1 byte stab type
|
|
1 byte stab other field
|
|
2 byte stab desc field
|
|
4 byte stab value
|
|
FIXME: This will have to change for a 64 bit object format.
|
|
|
|
The stabs symbols are divided into compilation units. For the
|
|
first entry in each unit, the type of 0, the value is the length
|
|
of the string table for this unit, and the desc field is the
|
|
number of stabs symbols for this unit. */
|
|
|
|
#define STRDXOFF (0)
|
|
#define TYPEOFF (4)
|
|
#define OTHEROFF (5)
|
|
#define DESCOFF (6)
|
|
#define VALOFF (8)
|
|
#define STABSIZE (12)
|
|
|
|
/* It would be nice if we could skip ahead to the stabs symbols for
|
|
the next compilation unit to quickly scan through the compilation
|
|
units. Unfortunately, since each line number gets a separate
|
|
stabs entry, it is entirely plausible that a large source file
|
|
will overflow the 16 bit count of stabs entries. */
|
|
fnaddr = 0;
|
|
directory_name = NULL;
|
|
main_file_name = NULL;
|
|
current_file_name = NULL;
|
|
line_file_name = NULL;
|
|
fnname = NULL;
|
|
low_func_vma = 0;
|
|
low_line_vma = 0;
|
|
|
|
stabend = info->stabs + stabsize;
|
|
|
|
if (info->cached_stab == NULL || offset < info->cached_offset)
|
|
{
|
|
stab = info->stabs;
|
|
str = info->strs;
|
|
stroff = 0;
|
|
}
|
|
else
|
|
{
|
|
stab = info->cached_stab;
|
|
str = info->cached_str;
|
|
stroff = info->cached_stroff;
|
|
}
|
|
|
|
info->cached_offset = offset;
|
|
|
|
for (; stab < stabend; stab += STABSIZE)
|
|
{
|
|
boolean done;
|
|
bfd_vma val;
|
|
char *name;
|
|
|
|
done = false;
|
|
|
|
switch (stab[TYPEOFF])
|
|
{
|
|
case 0:
|
|
/* This is the first entry in a compilation unit. */
|
|
if ((bfd_size_type) ((info->strs + strsize) - str) < stroff)
|
|
{
|
|
done = true;
|
|
break;
|
|
}
|
|
str += stroff;
|
|
stroff = bfd_get_32 (abfd, stab + VALOFF);
|
|
break;
|
|
|
|
case N_SO:
|
|
/* The main file name. */
|
|
|
|
val = bfd_get_32 (abfd, stab + VALOFF);
|
|
if (val > offset)
|
|
{
|
|
done = true;
|
|
break;
|
|
}
|
|
|
|
name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF);
|
|
|
|
/* An empty string indicates the end of the compilation
|
|
unit. */
|
|
if (*name == '\0')
|
|
{
|
|
/* If there are functions in different sections, they
|
|
may have addresses larger than val, but we don't want
|
|
to forget the file name. When there are functions in
|
|
different cases, there is supposed to be an N_FUN at
|
|
the end of the function indicating where it ends. */
|
|
if (low_func_vma < val || fnname == NULL)
|
|
main_file_name = NULL;
|
|
break;
|
|
}
|
|
|
|
/* We know that we have to get to at least this point in the
|
|
stabs entries for this offset. */
|
|
info->cached_stab = stab;
|
|
info->cached_str = str;
|
|
info->cached_stroff = stroff;
|
|
|
|
current_file_name = name;
|
|
|
|
/* Look ahead to the next symbol. Two consecutive N_SO
|
|
symbols are a directory and a file name. */
|
|
if (stab + STABSIZE >= stabend
|
|
|| *(stab + STABSIZE + TYPEOFF) != N_SO)
|
|
directory_name = NULL;
|
|
else
|
|
{
|
|
stab += STABSIZE;
|
|
directory_name = current_file_name;
|
|
current_file_name = ((char *) str
|
|
+ bfd_get_32 (abfd, stab + STRDXOFF));
|
|
}
|
|
|
|
main_file_name = current_file_name;
|
|
|
|
break;
|
|
|
|
case N_SOL:
|
|
/* The name of an include file. */
|
|
current_file_name = ((char *) str
|
|
+ bfd_get_32 (abfd, stab + STRDXOFF));
|
|
break;
|
|
|
|
case N_SLINE:
|
|
case N_DSLINE:
|
|
case N_BSLINE:
|
|
/* A line number. The value is relative to the start of the
|
|
current function. */
|
|
val = fnaddr + bfd_get_32 (abfd, stab + VALOFF);
|
|
if (val >= low_line_vma && val <= offset)
|
|
{
|
|
*pline = bfd_get_16 (abfd, stab + DESCOFF);
|
|
low_line_vma = val;
|
|
line_file_name = current_file_name;
|
|
}
|
|
break;
|
|
|
|
case N_FUN:
|
|
/* A function name. */
|
|
val = bfd_get_32 (abfd, stab + VALOFF);
|
|
name = (char *) str + bfd_get_32 (abfd, stab + STRDXOFF);
|
|
|
|
/* An empty string here indicates the end of a function, and
|
|
the value is relative to fnaddr. */
|
|
|
|
if (*name == '\0')
|
|
{
|
|
val += fnaddr;
|
|
if (val >= low_func_vma && val < offset)
|
|
fnname = NULL;
|
|
}
|
|
else
|
|
{
|
|
if (val >= low_func_vma && val <= offset)
|
|
{
|
|
fnname = name;
|
|
low_func_vma = val;
|
|
}
|
|
|
|
fnaddr = val;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
if (done)
|
|
break;
|
|
}
|
|
|
|
if (main_file_name == NULL)
|
|
{
|
|
/* No information found. */
|
|
return true;
|
|
}
|
|
|
|
*pfound = true;
|
|
|
|
if (*pline != 0)
|
|
main_file_name = line_file_name;
|
|
|
|
if (main_file_name != NULL)
|
|
{
|
|
if (main_file_name[0] == '/' || directory_name == NULL)
|
|
*pfilename = main_file_name;
|
|
else
|
|
{
|
|
size_t dirlen;
|
|
|
|
dirlen = strlen (directory_name);
|
|
if (info->filename == NULL
|
|
|| strncmp (info->filename, directory_name, dirlen) != 0
|
|
|| strcmp (info->filename + dirlen, main_file_name) != 0)
|
|
{
|
|
if (info->filename != NULL)
|
|
free (info->filename);
|
|
info->filename = (char *) bfd_malloc (dirlen +
|
|
strlen (main_file_name)
|
|
+ 1);
|
|
if (info->filename == NULL)
|
|
return false;
|
|
strcpy (info->filename, directory_name);
|
|
strcpy (info->filename + dirlen, main_file_name);
|
|
}
|
|
|
|
*pfilename = info->filename;
|
|
}
|
|
}
|
|
|
|
if (fnname != NULL)
|
|
{
|
|
char *s;
|
|
|
|
/* This will typically be something like main:F(0,1), so we want
|
|
to clobber the colon. It's OK to change the name, since the
|
|
string is in our own local storage anyhow. */
|
|
|
|
s = strchr (fnname, ':');
|
|
if (s != NULL)
|
|
*s = '\0';
|
|
|
|
*pfnname = fnname;
|
|
}
|
|
|
|
return true;
|
|
}
|