/* Read ELF (Executable and Linking Format) object files for GDB.
- Copyright (C) 1991 Free Software Foundation, Inc.
+ Copyright 1991, 1992 Free Software Foundation, Inc.
Written by Fred Fish at Cygnus Support.
This file is part of GDB.
* *
* This file is still under construction. When it is complete, this *
* notice will be removed. Until then, direct any questions or changes *
- * to Fred Fish at Cygnus Support (fnf@cygint) *
+ * to Fred Fish at Cygnus Support (fnf@cygnus.com) *
* *
* FIXME Still needs support for shared libraries. *
* FIXME Still needs support for core files. *
* *
************************************************************************/
-#include <stdio.h>
-
#include "defs.h"
#include "elf/common.h"
#include "elf/external.h"
#include "bfd.h"
#include "symtab.h"
#include "symfile.h"
+#include "objfiles.h"
+#include "buildsym.h"
#define STREQ(a,b) (strcmp((a),(b))==0)
unsigned int dbsize; /* Size of dwarf debug section */
unsigned int lnoffset; /* Offset to dwarf line number section */
unsigned int lnsize; /* Size of dwarf line number section */
+ asection *stabsect; /* Section pointer for .stab section */
+ asection *stabindexsect; /* Section pointer for .stab.index section */
};
static void
-elf_symfile_init PARAMS ((struct sym_fns *));
+elf_symfile_init PARAMS ((struct objfile *));
+
+static void
+elf_new_init PARAMS ((struct objfile *));
static void
-elf_new_init PARAMS ((void));
+elf_symfile_read PARAMS ((struct objfile *, CORE_ADDR, int));
static void
-elf_symfile_read PARAMS ((struct sym_fns *, CORE_ADDR, int));
+elf_symfile_finish PARAMS ((struct objfile *));
static void
-elf_symtab_read PARAMS ((bfd *, CORE_ADDR, int, struct objfile *));
+elf_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *));
static void
record_minimal_symbol PARAMS ((char *, CORE_ADDR, enum minimal_symbol_type,
knowledge of DWARF (by design, so any debugging format can be
used).
+ We also recognize the ".stab" sections used by the Sun compilers
+ released with Solaris 2.
+
FIXME: The section names should not be hardwired strings. */
static void
-elf_locate_sections (abfd, sectp, eip)
- bfd *abfd;
+elf_locate_sections (ignore_abfd, sectp, eip)
+ bfd *ignore_abfd;
asection *sectp;
PTR eip;
{
ei -> lnoffset = sectp -> filepos;
ei -> lnsize = bfd_get_section_size_before_reloc (sectp);
}
+ else if (STREQ (sectp -> name, ".stab"))
+ {
+ ei -> stabsect = sectp;
+ }
+ else if (STREQ (sectp -> name, ".stab.index"))
+ {
+ ei -> stabindexsect = sectp;
+ }
}
#if 0 /* Currently unused */
prim_record_minimal_symbol (name, address, ms_type);
}
+static void
+record_minimal_symbol_and_info (name, address, ms_type, info, objfile)
+ char *name;
+ CORE_ADDR address;
+ enum minimal_symbol_type ms_type;
+ char *info; /* FIXME, is this really char *? */
+ struct objfile *objfile;
+{
+ name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
+ prim_record_minimal_symbol_and_info (name, address, ms_type, info);
+}
+
/*
LOCAL FUNCTION
SYNOPSIS
- void elf_symtab_read (bfd *abfd, CORE_ADDR addr, int mainline,
+ void elf_symtab_read (bfd *abfd, CORE_ADDR addr,
struct objfile *objfile)
DESCRIPTION
*/
static void
-elf_symtab_read (abfd, addr, mainline, objfile)
+elf_symtab_read (abfd, addr, objfile)
bfd *abfd;
CORE_ADDR addr;
- int mainline;
struct objfile *objfile;
{
unsigned int storage_needed;
if (storage_needed > 0)
{
- symbol_table = (asymbol **) bfd_xmalloc (storage_needed);
+ symbol_table = (asymbol **) xmalloc (storage_needed);
back_to = make_cleanup (free, symbol_table);
number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
&& (sym -> section != NULL))
{
symaddr = sym -> value;
- /* Relocate all non-absolute symbols by base address.
- FIXME: Can we eliminate the check for mainline now,
- since shouldn't addr be 0 in this case? */
- if (!mainline && (sym -> section != &bfd_abs_section))
+ /* Relocate all non-absolute symbols by base address. */
+ if (sym -> section != &bfd_abs_section)
{
symaddr += addr;
}
{
ms_type = mst_unknown;
}
- record_minimal_symbol ((char *) sym -> name, symaddr, ms_type, objfile);
+ /* Pass symbol size field in via BFD. FIXME!!! */
+ record_minimal_symbol_and_info ((char *) sym -> name,
+ symaddr, ms_type, sym->udata, objfile);
}
}
do_cleanups (back_to);
symbol tables. When more extensive information is requested of a
file, the corresponding partial symbol table is mutated into a full
fledged symbol table by going back and reading the symbols
- for real. The function dwarf_psymtab_to_symtab() is the function that
- does this for DWARF symbols.
+ for real.
+
+ We look for sections with specific names, to tell us what debug
+ format to look for: FIXME!!!
+
+ dwarf_build_psymtabs() builds psymtabs for DWARF symbols;
+ elfstab_build_psymtabs() handles STABS symbols.
Note that ELF files have a "minimal" symbol table, which looks a lot
like a COFF symbol table, but has only the minimal information necessary
- for linking. We process this also, and just use the information to
- add to gdb's minimal symbol table. This gives us some minimal debugging
- capability even for files compiled without -g.
- */
+ for linking. We process this also, and use the information to
+ build gdb's minimal symbol table. This gives us some minimal debugging
+ capability even for files compiled without -g. */
static void
-elf_symfile_read (sf, addr, mainline)
- struct sym_fns *sf;
+elf_symfile_read (objfile, addr, mainline)
+ struct objfile *objfile;
CORE_ADDR addr;
int mainline;
{
- bfd *abfd = sf->objfile->obfd;
+ bfd *abfd = objfile->obfd;
struct elfinfo ei;
struct cleanup *back_to;
+ asection *text_sect;
+ CORE_ADDR offset;
init_minimal_symbol_collection ();
back_to = make_cleanup (discard_minimal_symbols, 0);
+ /* Compute the amount to relocate all symbols by. The value passed in
+ as ADDR is typically either the actual address of the text section,
+ or a user specified address. By subtracting off the actual address
+ of the text section, we can compute the relocation amount. */
+
+ text_sect = bfd_get_section_by_name (objfile -> obfd, ".text");
+ offset = addr - bfd_section_vma (objfile -> obfd, text_sect);
+
/* Process the normal ELF symbol table first. */
- elf_symtab_read (abfd, addr, mainline, sf->objfile);
+ elf_symtab_read (abfd, offset, objfile);
- /* Now process the DWARF debugging information, which is contained in
+ /* Now process debugging information, which is contained in
special ELF sections. We first have to find them... */
(void) memset ((char *) &ei, 0, sizeof (ei));
bfd_map_over_sections (abfd, elf_locate_sections, (PTR) &ei);
if (ei.dboffset && ei.lnoffset)
{
+ /* DWARF sections */
dwarf_build_psymtabs (fileno ((FILE *)(abfd -> iostream)),
bfd_get_filename (abfd),
- addr, mainline,
+ offset, mainline,
ei.dboffset, ei.dbsize,
- ei.lnoffset, ei.lnsize, sf->objfile);
+ ei.lnoffset, ei.lnsize, objfile);
+ }
+ if (ei.stabsect)
+ {
+ /* STABS sections */
+
+ /* FIXME: Sun didn't really know how to implement this well.
+ They made .stab sections that don't point to the .stabstr
+ section with the sh_link field. BFD doesn't make string table
+ sections visible to the caller. So we have to search the
+ ELF section table, not the BFD section table, for the string
+ table. */
+ Elf_Internal_Shdr *elf_sect = bfd_elf_find_section (abfd, ".stabstr");
+
+ if (elf_sect)
+ elfstab_build_psymtabs (objfile,
+ addr, /* We really pass the text seg addr, not the offset, here. */
+ mainline,
+ ei.stabsect->filepos, /* .stab offset */
+ bfd_get_section_size_before_reloc (ei.stabsect),/* .stab size */
+ elf_sect->sh_offset, /* .stabstr offset */
+ elf_sect->sh_size); /* .stabstr size */
}
if (!have_partial_symbols ())
/* Install any minimal symbols that have been collected as the current
minimal symbols for this objfile. */
- install_minimal_symbols (sf -> objfile);
+ install_minimal_symbols (objfile);
do_cleanups (back_to);
}
file is specified (not just adding some symbols from another file, e.g. a
shared library).
- For now at least, we have nothing in particular to do, so this function is
- just a stub. */
+ We reinitialize buildsym, since we may be reading stabs from an ELF file. */
static void
-elf_new_init ()
+elf_new_init (ignore)
+ struct objfile *ignore;
{
+ buildsym_new_init ();
+}
+
+/* Perform any local cleanups required when we are done with a particular
+ objfile. I.E, we are in the process of discarding all symbol information
+ for an objfile, freeing up all memory held for it, and unlinking the
+ objfile struct from the global list of known objfiles. */
+
+static void
+elf_symfile_finish (objfile)
+ struct objfile *objfile;
+{
+ if (objfile -> sym_private != NULL)
+ {
+ mfree (objfile -> md, objfile -> sym_private);
+ }
}
/* ELF specific initialization routine for reading symbols.
just a stub. */
static void
-elf_symfile_init (sf)
- struct sym_fns *sf;
+elf_symfile_init (ignore)
+ struct objfile *ignore;
{
}
use "elf" in the same sense as "a.out" or "coff", to imply both the ELF
object file format and the DWARF debugging format. */
-static struct sym_fns elf_sym_fns = {
+static struct sym_fns elf_sym_fns =
+{
"elf", /* sym_name: name or name prefix of BFD target type */
3, /* sym_namelen: number of significant sym_name chars */
elf_new_init, /* sym_new_init: init anything gbl to entire symtab */
elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */
elf_symfile_read, /* sym_read: read a symbol file into symtab */
- NULL, /* sym_bfd: accessor for symbol file being read */
- NULL, /* sym_private: sym_init & sym_read shared info */
+ elf_symfile_finish, /* sym_finish: finished with file, cleanup */
NULL /* next: pointer to next struct sym_fns */
};
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