/* Read ELF (Executable and Linking Format) object files for GDB.
- Copyright (C) 1991 Free Software Foundation, Inc.
+ Copyright 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
Written by Fred Fish at Cygnus Support.
This file is part of GDB.
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
-/************************************************************************
- * *
- * NOTICE *
- * *
- * 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) *
- * *
- * 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 <string.h>
+#include "libelf.h"
+#include "elf/mips.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"
+#include "stabsread.h"
+#include "gdb-stabs.h"
+#include "complaints.h"
+#include "demangle.h"
-#define STREQ(a,b) (strcmp((a),(b))==0)
+/* The struct elfinfo is available only during ELF symbol table and
+ psymtab reading. It is destroyed at the complation of psymtab-reading.
+ It's local to elf_symfile_read. */
struct elfinfo {
- unsigned int dboffset; /* Offset to dwarf debug section */
+ file_ptr dboffset; /* Offset to dwarf debug section */
unsigned int dbsize; /* Size of dwarf debug section */
- unsigned int lnoffset; /* Offset to dwarf line number section */
+ file_ptr 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 */
+ asection *mdebugsect; /* Section pointer for .mdebug section */
};
+/* Various things we might complain about... */
+
+struct complaint section_info_complaint =
+ {"elf/stab section information %s without a preceding file symbol", 0, 0};
+
+struct complaint section_info_dup_complaint =
+ {"duplicated elf/stab section information for %s", 0, 0};
+
+struct complaint stab_info_mismatch_complaint =
+ {"elf/stab section information missing for %s", 0, 0};
+
+struct complaint stab_info_questionable_complaint =
+ {"elf/stab section information questionable for %s", 0, 0};
+
+static void
+elf_symfile_init PARAMS ((struct objfile *));
+
+static void
+elf_new_init PARAMS ((struct objfile *));
+
+static void
+elf_symfile_read PARAMS ((struct objfile *, struct section_offsets *, int));
+
+static void
+elf_symfile_finish PARAMS ((struct objfile *));
+
+static void
+elf_symtab_read PARAMS ((bfd *, CORE_ADDR, struct objfile *, int));
+
+static void
+free_elfinfo PARAMS ((void *));
+
+static struct section_offsets *
+elf_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
+
+static struct minimal_symbol *
+record_minimal_symbol_and_info PARAMS ((char *, CORE_ADDR,
+ enum minimal_symbol_type, char *,
+ struct objfile *));
+
+static void
+elf_locate_sections PARAMS ((bfd *, asection *, void *));
+
/* 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).
- FIXME: The section names should not be hardwired strings. */
+ We also recognize the ".stab" sections used by the Sun compilers
+ released with Solaris 2.
+
+ FIXME: The section names should not be hardwired strings (what
+ should they be? I don't think most object file formats have enough
+ section flags to specify what kind of debug section it is
+ -kingdon). */
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 -> 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;
+ }
+ else if (STREQ (sectp -> name, ".mdebug"))
+ {
+ ei -> mdebugsect = 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);
}
-/*
-
-LOCAL FUNCTION
-
- record_misc_function -- add entry to miscellaneous function vector
+#endif
-SYNOPSIS
-
- static void record_misc_function (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.
-
-NOTES
+static struct minimal_symbol *
+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;
+{
+ int section;
- FIXME: For now we just use mf_unknown as the type. This should be
- fixed.
- */
+ /* Guess the section from the type. This is likely to be wrong in
+ some cases. */
+ switch (ms_type)
+ {
+ case mst_text:
+ case mst_file_text:
+ section = SECT_OFF_TEXT;
+#ifdef SMASH_TEXT_ADDRESS
+ SMASH_TEXT_ADDRESS (address);
+#endif
+ break;
+ case mst_data:
+ case mst_file_data:
+ section = SECT_OFF_DATA;
+ break;
+ case mst_bss:
+ case mst_file_bss:
+ section = SECT_OFF_BSS;
+ break;
+ default:
+ section = -1;
+ break;
+ }
-static void
-DEFUN(record_misc_function, (name, address, mf_type),
- char *name AND CORE_ADDR address AND enum misc_function_type mf_type)
-{
- prim_record_misc_function (obsavestring (name, strlen (name)), address,
- mf_type);
+ name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
+ return prim_record_minimal_symbol_and_info
+ (name, address, ms_type, info, section, objfile);
}
/*
SYNOPSIS
- void elf_symtab_read (bfd *abfd, CORE_ADDR addr, int mainline)
+ void elf_symtab_read (bfd *abfd, CORE_ADDR addr,
+ struct objfile *objfile, int dynamic)
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.
+
+ In stabs-in-ELF, as implemented by Sun, there are some local symbols
+ defined in the ELF symbol table, which can be used to locate
+ the beginnings of sections from each ".o" file that was linked to
+ form the executable objfile. We gather any such info and record it
+ in data structures hung off the objfile's private data.
*/
static void
-DEFUN (elf_symtab_read, (abfd, addr, mainline),
- bfd *abfd AND
- CORE_ADDR addr AND
- int mainline)
+elf_symtab_read (abfd, addr, objfile, dynamic)
+ bfd *abfd;
+ CORE_ADDR addr;
+ struct objfile *objfile;
+ int dynamic;
{
- unsigned int storage_needed;
+ long storage_needed;
asymbol *sym;
asymbol **symbol_table;
- unsigned int number_of_symbols;
- unsigned int i;
+ long number_of_symbols;
+ long i;
+ int index;
struct cleanup *back_to;
CORE_ADDR symaddr;
- enum misc_function_type mf_type;
-
- storage_needed = get_symtab_upper_bound (abfd);
+ enum minimal_symbol_type ms_type;
+ /* If sectinfo is nonNULL, it contains section info that should end up
+ filed in the objfile. */
+ struct stab_section_info *sectinfo = NULL;
+ /* If filesym is nonzero, it points to a file symbol, but we haven't
+ seen any section info for it yet. */
+ asymbol *filesym = 0;
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
+ /* Name of filesym, as saved on the symbol_obstack. */
+ char *filesymname = obsavestring ("", 0, &objfile->symbol_obstack);
+#endif
+ struct dbx_symfile_info *dbx = (struct dbx_symfile_info *)
+ objfile->sym_stab_info;
+ unsigned long size;
+ int stripped = (bfd_get_symcount (abfd) == 0);
+
+ if (dynamic)
+ {
+ storage_needed = bfd_get_dynamic_symtab_upper_bound (abfd);
+ /* Nothing to be done if there is no dynamic symtab. */
+ if (storage_needed < 0)
+ return;
+ }
+ else
+ {
+ storage_needed = bfd_get_symtab_upper_bound (abfd);
+ if (storage_needed < 0)
+ error ("Can't read symbols from %s: %s", bfd_get_filename (abfd),
+ bfd_errmsg (bfd_get_error ()));
+ }
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);
-
+ if (dynamic)
+ number_of_symbols = bfd_canonicalize_dynamic_symtab (abfd,
+ symbol_table);
+ else
+ number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
+ if (number_of_symbols < 0)
+ error ("Can't read symbols from %s: %s", bfd_get_filename (abfd),
+ bfd_errmsg (bfd_get_error ()));
for (i = 0; i < number_of_symbols; i++)
{
- sym = *symbol_table++;
- /* 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))
+ sym = symbol_table[i];
+ if (sym -> name == NULL || *sym -> name == '\0')
+ {
+ /* Skip names that don't exist (shouldn't happen), or names
+ that are null strings (may happen). */
+ continue;
+ }
+
+ if (dynamic
+ && sym -> section == &bfd_und_section
+ && (sym -> flags & BSF_FUNCTION))
{
+ struct minimal_symbol *msym;
+
+ /* Symbol is a reference to a function defined in
+ a shared library.
+ If its value is non zero then it is usually the address
+ of the corresponding entry in the procedure linkage table,
+ relative to the base address.
+ If its value is zero then the dynamic linker has to resolve
+ the symbol. We are unable to find any meaningful address
+ for this symbol in the executable file, so we skip it. */
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))
+ if (symaddr == 0)
+ continue;
+ symaddr += addr;
+ msym = record_minimal_symbol_and_info
+ ((char *) sym -> name, symaddr,
+ mst_solib_trampoline, NULL, objfile);
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
+ msym->filename = filesymname;
+#endif
+ continue;
+ }
+
+ /* If it is a nonstripped executable, do not enter dynamic
+ symbols, as the dynamic symbol table is usually a subset
+ of the main symbol table. */
+ if (dynamic && !stripped)
+ continue;
+ if (sym -> flags & BSF_FILE)
+ {
+ /* STT_FILE debugging symbol that helps stabs-in-elf debugging.
+ Chain any old one onto the objfile; remember new sym. */
+ if (sectinfo != NULL)
+ {
+ sectinfo -> next = dbx -> stab_section_info;
+ dbx -> stab_section_info = sectinfo;
+ sectinfo = NULL;
+ }
+ filesym = sym;
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
+ filesymname =
+ obsavestring ((char *)filesym->name, strlen (filesym->name),
+ &objfile->symbol_obstack);
+#endif
+ }
+ else if (sym -> flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK))
+ {
+ struct minimal_symbol *msym;
+
+ /* Select global/local/weak symbols. Note that bfd puts abs
+ symbols in their own section, so all symbols we are
+ interested in will have a section. */
+ /* Bfd symbols are section relative. */
+ symaddr = sym -> value + sym -> section -> vma;
+ /* Relocate all non-absolute symbols by base address. */
+ if (sym -> section != &bfd_abs_section)
{
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 -> flags & SEC_CODE)
+ if (sym -> section == &bfd_abs_section)
{
- mf_type = mf_text;
+ /* This is a hack to get the minimal symbol type
+ right for Irix 5, which has absolute adresses
+ with special section indices for dynamic symbols. */
+ unsigned short shndx =
+ ((elf_symbol_type *) sym)->internal_elf_sym.st_shndx;
+
+ switch (shndx)
+ {
+ case SHN_MIPS_TEXT:
+ ms_type = mst_text;
+ break;
+ case SHN_MIPS_DATA:
+ ms_type = mst_data;
+ break;
+ case SHN_MIPS_ACOMMON:
+ ms_type = mst_bss;
+ break;
+ default:
+ ms_type = mst_abs;
+ }
}
- else if (sym -> section -> flags & SEC_DATA)
+ else if (sym -> section -> flags & SEC_CODE)
{
- mf_type = mf_data;
+ if (sym -> flags & BSF_GLOBAL)
+ {
+ ms_type = mst_text;
+ }
+ else if ((sym->name[0] == '.' && sym->name[1] == 'L')
+ || ((sym -> flags & BSF_LOCAL)
+ && sym->name[0] == '$'
+ && sym->name[1] == 'L'))
+ /* Looks like a compiler-generated label. Skip it.
+ The assembler should be skipping these (to keep
+ executables small), but apparently with gcc on the
+ delta m88k SVR4, it loses. So to have us check too
+ should be harmless (but I encourage people to fix this
+ in the assembler instead of adding checks here). */
+ continue;
+ else
+ {
+ ms_type = mst_file_text;
+ }
+ }
+ else if (sym -> section -> flags & SEC_ALLOC)
+ {
+ if (sym -> flags & BSF_GLOBAL)
+ {
+ if (sym -> section -> flags & SEC_LOAD)
+ {
+ ms_type = mst_data;
+ }
+ else
+ {
+ ms_type = mst_bss;
+ }
+ }
+ else if (sym -> flags & BSF_LOCAL)
+ {
+ /* Named Local variable in a Data section. Check its
+ name for stabs-in-elf. The STREQ macro checks the
+ first character inline, so we only actually do a
+ strcmp function call on names that start with 'B'
+ or 'D' */
+ index = SECT_OFF_MAX;
+ if (STREQ ("Bbss.bss", sym -> name))
+ {
+ index = SECT_OFF_BSS;
+ }
+ else if (STREQ ("Ddata.data", sym -> name))
+ {
+ index = SECT_OFF_DATA;
+ }
+ else if (STREQ ("Drodata.rodata", sym -> name))
+ {
+ index = SECT_OFF_RODATA;
+ }
+ if (index != SECT_OFF_MAX)
+ {
+ /* Found a special local symbol. Allocate a
+ sectinfo, if needed, and fill it in. */
+ if (sectinfo == NULL)
+ {
+ sectinfo = (struct stab_section_info *)
+ xmmalloc (objfile -> md, sizeof (*sectinfo));
+ memset ((PTR) sectinfo, 0, sizeof (*sectinfo));
+ if (filesym == NULL)
+ {
+ complain (§ion_info_complaint,
+ sym -> name);
+ }
+ else
+ {
+ sectinfo -> filename =
+ (char *) filesym -> name;
+ }
+ }
+ if (sectinfo -> sections[index] != 0)
+ {
+ complain (§ion_info_dup_complaint,
+ sectinfo -> filename);
+ }
+ /* Bfd symbols are section relative. */
+ symaddr = sym -> value + sym -> section -> vma;
+ /* Relocate non-absolute symbols by base address. */
+ if (sym -> section != &bfd_abs_section)
+ {
+ symaddr += addr;
+ }
+ sectinfo -> sections[index] = symaddr;
+ /* The special local symbols don't go in the
+ minimal symbol table, so ignore this one. */
+ continue;
+ }
+ /* Not a special stabs-in-elf symbol, do regular
+ symbol processing. */
+ if (sym -> section -> flags & SEC_LOAD)
+ {
+ ms_type = mst_file_data;
+ }
+ else
+ {
+ ms_type = mst_file_bss;
+ }
+ }
+ else
+ {
+ ms_type = mst_unknown;
+ }
}
else
{
- mf_type = mf_unknown;
+ /* FIXME: Solaris2 shared libraries include lots of
+ odd "absolute" and "undefined" symbols, that play
+ hob with actions like finding what function the PC
+ is in. Ignore them if they aren't text, data, or bss. */
+ /* ms_type = mst_unknown; */
+ continue; /* Skip this symbol. */
}
- record_misc_function ((char *) sym -> name, symaddr, mf_type);
+ /* Pass symbol size field in via BFD. FIXME!!! */
+ size = ((elf_symbol_type *) sym) -> internal_elf_sym.st_size;
+ msym = record_minimal_symbol_and_info
+ ((char *) sym -> name, symaddr,
+ ms_type, (PTR) size, objfile);
+#ifdef SOFUN_ADDRESS_MAYBE_MISSING
+ msym->filename = filesymname;
+#endif
}
}
do_cleanups (back_to);
We have been initialized by a call to elf_symfile_init, which
currently does nothing.
- ADDR is the address relative to which the symbols in it are (e.g.
- the base address of the text segment).
+ SECTION_OFFSETS is a set of offsets to apply to relocate the symbols
+ in each section. We simplify it down to a single offset for all
+ symbols. FIXME.
MAINLINE is true if we are reading the main symbol
table (as opposed to a shared lib or dynamically loaded file).
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;
+ mdebug_build_psymtabs() handles ECOFF debugging information.
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, section_offsets, mainline)
+ struct objfile *objfile;
+ struct section_offsets *section_offsets;
+ int mainline;
{
- bfd *abfd = sf->objfile->obfd;
+ bfd *abfd = objfile->obfd;
struct elfinfo ei;
struct cleanup *back_to;
+ CORE_ADDR offset;
- init_misc_bunches ();
- back_to = make_cleanup (discard_misc_bunches, 0);
+ init_minimal_symbol_collection ();
+ back_to = make_cleanup (discard_minimal_symbols, 0);
- /* Process the normal ELF symbol table first. */
+ memset ((char *) &ei, 0, sizeof (ei));
- elf_symtab_read (abfd, addr, mainline);
+ /* Allocate struct to keep track of the symfile */
+ objfile->sym_stab_info = (PTR)
+ xmmalloc (objfile -> md, sizeof (struct dbx_symfile_info));
+ memset ((char *) objfile->sym_stab_info, 0, sizeof (struct dbx_symfile_info));
+ make_cleanup (free_elfinfo, (PTR) objfile);
- /* Now process the DWARF debugging information, which is contained in
+ /* Process the normal ELF symbol table first. This may write some
+ chain of info into the dbx_symfile_info in objfile->sym_stab_info,
+ which can later be used by elfstab_offset_sections. */
+
+ /* FIXME, should take a section_offsets param, not just an offset. */
+ offset = ANOFFSET (section_offsets, 0);
+ elf_symtab_read (abfd, offset, objfile, 0);
+
+ /* Add the dynamic symbols. */
+
+ elf_symtab_read (abfd, offset, objfile, 1);
+
+ /* 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_build_psymtabs (fileno ((FILE *)(abfd -> iostream)),
- bfd_get_filename (abfd),
- addr, mainline,
+ /* DWARF sections */
+ dwarf_build_psymtabs (objfile,
+ section_offsets, mainline,
ei.dboffset, ei.dbsize,
- ei.lnoffset, ei.lnsize, sf->objfile);
+ ei.lnoffset, ei.lnsize);
}
-
- if (!partial_symtab_list)
+ if (ei.stabsect)
+ {
+ asection *str_sect;
+
+ /* Stab sections have an associated string table that looks like
+ a separate section. */
+ str_sect = bfd_get_section_by_name (abfd, ".stabstr");
+
+ /* FIXME should probably warn about a stab section without a stabstr. */
+ if (str_sect)
+ elfstab_build_psymtabs (objfile,
+ section_offsets,
+ mainline,
+ ei.stabsect->filepos,
+ bfd_section_size (abfd, ei.stabsect),
+ str_sect->filepos,
+ bfd_section_size (abfd, str_sect));
+ }
+ if (ei.mdebugsect)
{
- wrap_here ("");
- printf_filtered ("(no debugging symbols found)...");
- wrap_here ("");
+ const struct ecoff_debug_swap *swap;
+
+ /* .mdebug section, presumably holding ECOFF debugging
+ information. */
+ swap = get_elf_backend_data (abfd)->elf_backend_ecoff_debug_swap;
+ if (swap)
+ elfmdebug_build_psymtabs (objfile, swap, ei.mdebugsect,
+ section_offsets);
}
- /* 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);
}
+/* This cleans up the objfile's sym_stab_info pointer, and the chain of
+ stab_section_info's, that might be dangling from it. */
+
+static void
+free_elfinfo (objp)
+ PTR objp;
+{
+ struct objfile *objfile = (struct objfile *)objp;
+ struct dbx_symfile_info *dbxinfo = (struct dbx_symfile_info *)
+ objfile->sym_stab_info;
+ struct stab_section_info *ssi, *nssi;
+
+ ssi = dbxinfo->stab_section_info;
+ while (ssi)
+ {
+ nssi = ssi->next;
+ mfree (objfile->md, ssi);
+ ssi = nssi;
+ }
+
+ dbxinfo->stab_section_info = 0; /* Just say No mo info about this. */
+}
+
+
/* Initialize anything that needs initializing when a completely new symbol
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
-DEFUN_VOID (elf_new_init)
+elf_new_init (ignore)
+ struct objfile *ignore;
{
+ stabsread_new_init ();
+ 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_stab_info != NULL)
+ {
+ mfree (objfile -> md, objfile -> sym_stab_info);
+ }
}
/* 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;
{
}
+/* ELF specific parsing routine for section offsets.
+
+ Plain and simple for now. */
+
+static
+struct section_offsets *
+elf_symfile_offsets (objfile, addr)
+ struct objfile *objfile;
+ CORE_ADDR addr;
+{
+ struct section_offsets *section_offsets;
+ int i;
+
+ objfile->num_sections = SECT_OFF_MAX;
+ section_offsets = (struct section_offsets *)
+ obstack_alloc (&objfile -> psymbol_obstack,
+ sizeof (struct section_offsets)
+ + sizeof (section_offsets->offsets) * (SECT_OFF_MAX-1));
+
+ for (i = 0; i < SECT_OFF_MAX; i++)
+ ANOFFSET (section_offsets, i) = addr;
+
+ return section_offsets;
+}
+\f
+/* When handling an ELF file that contains Sun STABS debug info,
+ some of the debug info is relative to the particular chunk of the
+ section that was generated in its individual .o file. E.g.
+ offsets to static variables are relative to the start of the data
+ segment *for that module before linking*. This information is
+ painfully squirreled away in the ELF symbol table as local symbols
+ with wierd names. Go get 'em when needed. */
+
+void
+elfstab_offset_sections (objfile, pst)
+ struct objfile *objfile;
+ struct partial_symtab *pst;
+{
+ char *filename = pst->filename;
+ struct dbx_symfile_info *dbx = (struct dbx_symfile_info *)
+ objfile->sym_stab_info;
+ struct stab_section_info *maybe = dbx->stab_section_info;
+ struct stab_section_info *questionable = 0;
+ int i;
+ char *p;
+
+ /* The ELF symbol info doesn't include path names, so strip the path
+ (if any) from the psymtab filename. */
+ while (0 != (p = strchr (filename, '/')))
+ filename = p+1;
+
+ /* FIXME: This linear search could speed up significantly
+ if it was chained in the right order to match how we search it,
+ and if we unchained when we found a match. */
+ for (; maybe; maybe = maybe->next)
+ {
+ if (filename[0] == maybe->filename[0]
+ && STREQ (filename, maybe->filename))
+ {
+ /* We found a match. But there might be several source files
+ (from different directories) with the same name. */
+ if (0 == maybe->found)
+ break;
+ questionable = maybe; /* Might use it later. */
+ }
+ }
+
+ if (maybe == 0 && questionable != 0)
+ {
+ complain (&stab_info_questionable_complaint, filename);
+ maybe = questionable;
+ }
+
+ if (maybe)
+ {
+ /* Found it! Allocate a new psymtab struct, and fill it in. */
+ maybe->found++;
+ pst->section_offsets = (struct section_offsets *)
+ obstack_alloc (&objfile -> psymbol_obstack,
+ sizeof (struct section_offsets) +
+ sizeof (pst->section_offsets->offsets) * (SECT_OFF_MAX-1));
+
+ for (i = 0; i < SECT_OFF_MAX; i++)
+ ANOFFSET (pst->section_offsets, i) = maybe->sections[i];
+ return;
+ }
+
+ /* We were unable to find any offsets for this file. Complain. */
+ if (dbx->stab_section_info) /* If there *is* any info, */
+ complain (&stab_info_mismatch_complaint, filename);
+}
\f
-/* Register that we are able to handle ELF object file formats and DWARF
- debugging formats.
-
- Unlike other object file formats, where the debugging information format
- is implied by the object file format, the ELF object file format and the
- DWARF debugging information format are two distinct, and potentially
- separate entities. I.E. it is perfectly possible to have ELF objects
- with debugging formats other than DWARF. And it is conceivable that the
- DWARF debugging format might be used with another object file format,
- like COFF, by simply using COFF's custom section feature.
-
- GDB, and to a lesser extent BFD, should support the notion of separate
- object file formats and debugging information formats. For now, we just
- 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 = {
- "elf", /* sym_name: name or name prefix of BFD target type */
- 3, /* sym_namelen: number of significant sym_name chars */
+/* Register that we are able to handle ELF object file formats. */
+
+static struct sym_fns elf_sym_fns =
+{
+ bfd_target_elf_flavour,
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 */
+ elf_symfile_offsets, /* sym_offsets: Translate ext. to int. relocation */
NULL /* next: pointer to next struct sym_fns */
};
void
-DEFUN_VOID (_initialize_elfread)
+_initialize_elfread ()
{
add_symtab_fns (&elf_sym_fns);
}