/* 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. *
* FIXME The ".debug" and ".line" section names are hardwired. *
- * FIXME Still needs support ELF symbol tables (as distinct *
- * from DWARF support). Can use them to build the misc *
- * function vector at least. This is fairly trivial once *
- * bfd is extended to handle ELF symbol tables. *
* *
************************************************************************/
-#include <stdio.h>
-
#include "defs.h"
#include "elf/common.h"
#include "elf/external.h"
#include "elf/internal.h"
#include "bfd.h"
-#include "symfile.h"
#include "symtab.h"
-#include "ansidecl.h"
-
-extern int EXFUN (strcmp, (CONST char *a, CONST char *b));
-extern int EXFUN (dwarf_build_psymtabs,
- (int desc, char *filename, CORE_ADDR addr, int mainline,
- unsigned int dbfoff, unsigned int dbsize, unsigned int lnoffset,
- unsigned int lnsize, struct objfile *objfile));
+#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 objfile *));
+
+static void
+elf_new_init PARAMS ((struct objfile *));
+
+static void
+elf_symfile_read PARAMS ((struct objfile *, CORE_ADDR, int));
+
+static void
+elf_symfile_finish PARAMS ((struct objfile *));
+
+static void
+elf_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *));
+
+static void
+record_minimal_symbol PARAMS ((char *, CORE_ADDR, enum minimal_symbol_type,
+ struct objfile *));
+
+static void
+elf_locate_sections PARAMS ((bfd *, asection *, PTR));
+
/* We are called once per section from elf_symfile_read. We
need to examine each section we are passed, check to see
if it is something we are interested in processing, and
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
-DEFUN(elf_locate_sections, (abfd, sectp, ei),
- bfd *abfd AND
- asection *sectp AND
- struct elfinfo *ei)
+elf_locate_sections (ignore_abfd, sectp, eip)
+ bfd *ignore_abfd;
+ asection *sectp;
+ PTR eip;
{
+ register struct elfinfo *ei;
+
+ ei = (struct elfinfo *) eip;
if (STREQ (sectp -> name, ".debug"))
{
ei -> dboffset = sectp -> filepos;
- ei -> dbsize = sectp -> size;
+ ei -> dbsize = bfd_get_section_size_before_reloc (sectp);
}
else if (STREQ (sectp -> name, ".line"))
{
ei -> lnoffset = sectp -> filepos;
- ei -> lnsize = sectp -> size;
+ 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 */
+
char *
-DEFUN(elf_interpreter, (abfd),
- bfd *abfd)
+elf_interpreter (abfd)
+ bfd *abfd;
{
sec_ptr interp_sec;
unsigned size;
return (interp);
}
+#endif
+
/*
LOCAL FUNCTION
- record_misc_function -- add entry to miscellaneous function vector
+ record_minimal_symbol -- add entry to minimal symbol table
SYNOPSIS
- static void record_misc_function (char *name, CORE_ADDR address)
+ static void record_minimal_symbol (char *name, CORE_ADDR address)
DESCRIPTION
Given a pointer to the name of a symbol that should be added to the
- miscellaneous function vector, and the address associated with that
- symbol, records this information for later use in building the
- miscellaneous function vector.
+ minimal symbol table and the address associated with that symbol, records
+ this information for later use in building the minimal symbol table.
-NOTES
-
- FIXME: For now we just use mf_unknown as the type. This should be
- fixed.
*/
static void
-DEFUN(record_misc_function, (name, address, mf_type),
- char *name AND CORE_ADDR address AND enum misc_function_type mf_type)
+record_minimal_symbol (name, address, ms_type, objfile)
+ char *name;
+ CORE_ADDR address;
+ enum minimal_symbol_type ms_type;
+ struct objfile *objfile;
{
- prim_record_misc_function (obsavestring (name, strlen (name)), address,
- mf_type);
+ name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
+ 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);
}
/*
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
Given an open bfd, a base address to relocate symbols to, and a
flag that specifies whether or not this bfd is for an executable
or not (may be shared library for example), add all the global
- function and data symbols to the miscellaneous function vector.
+ function and data symbols to the minimal symbol table.
*/
static void
-DEFUN (elf_symtab_read, (abfd, addr, mainline),
- bfd *abfd AND
- CORE_ADDR addr AND
- int mainline)
+elf_symtab_read (abfd, addr, objfile)
+ bfd *abfd;
+ CORE_ADDR addr;
+ struct objfile *objfile;
{
unsigned int storage_needed;
asymbol *sym;
unsigned int i;
struct cleanup *back_to;
CORE_ADDR symaddr;
- enum misc_function_type mf_type;
+ enum minimal_symbol_type ms_type;
storage_needed = get_symtab_upper_bound (abfd);
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);
for (i = 0; i < number_of_symbols; i++)
{
sym = *symbol_table++;
- /* Select global symbols that are defined in a specific section
- or are absolute. */
- if (sym -> flags & BSF_GLOBAL
- && ((sym -> section != NULL) || (sym -> flags & BSF_ABSOLUTE)))
+ /* Select global/weak symbols that are defined in a specific section.
+ Note that bfd now puts abs symbols in their own section, so
+ all symbols we are interested in will have a section. */
+ if ((sym -> flags & (BSF_GLOBAL | BSF_WEAK))
+ && (sym -> section != NULL))
{
symaddr = sym -> value;
- if (!mainline)
+ /* Relocate all non-absolute symbols by base address. */
+ if (sym -> section != &bfd_abs_section)
{
- /* Relocate all symbols by base address */
symaddr += addr;
}
/* For non-absolute symbols, use the type of the section
they are relative to, to intuit text/data. Bfd provides
no way of figuring this out for absolute symbols. */
- if (sym -> section && (sym -> section -> flags & SEC_CODE))
+ if (sym -> section -> flags & SEC_CODE)
{
- mf_type = mf_text;
+ ms_type = mst_text;
}
- else if (sym -> section && (sym -> section -> flags & SEC_DATA))
+ else if (sym -> section -> flags & SEC_DATA)
{
- mf_type = mf_data;
+ ms_type = mst_data;
}
else
{
- mf_type = mf_unknown;
+ ms_type = mst_unknown;
}
- record_misc_function ((char *) sym -> name, symaddr, mf_type);
+ /* 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 the misc function vector. 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
-DEFUN(elf_symfile_read, (sf, addr, mainline),
- struct sym_fns *sf AND
- CORE_ADDR addr AND
- int mainline)
+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. */
- init_misc_bunches ();
- back_to = make_cleanup (discard_misc_bunches, 0);
+ 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);
+ 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, &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 (!partial_symtab_list)
+ if (!have_partial_symbols ())
{
wrap_here ("");
printf_filtered ("(no debugging symbols found)...");
wrap_here ("");
}
- /* Go over the miscellaneous functions and install them in the
- miscellaneous function vector. */
-
- condense_misc_bunches (!mainline);
+ /* Install any minimal symbols that have been collected as the current
+ minimal symbols for this 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 (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
-DEFUN_VOID (elf_new_init)
+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
-DEFUN(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 */
};
void
-DEFUN_VOID (_initialize_elfread)
+_initialize_elfread ()
{
add_symtab_fns (&elf_sym_fns);
}
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