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@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. *
- * *
- ************************************************************************/
-
#include "defs.h"
-#include "elf/common.h"
-#include "elf/external.h"
-#include "elf/internal.h"
#include "bfd.h"
+#include <time.h> /* For time_t in libbfd.h. */
+#include <sys/types.h> /* For time_t, if not in time.h. */
#include "libbfd.h" /* For bfd_elf_find_section */
+#include "libelf.h"
#include "symtab.h"
#include "symfile.h"
#include "objfiles.h"
#include "buildsym.h"
+#include "stabsread.h"
+#include "gdb-stabs.h"
+#include "complaints.h"
+#include <string.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 */
};
+/* 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 *));
elf_new_init PARAMS ((struct objfile *));
static void
-elf_symfile_read PARAMS ((struct objfile *, CORE_ADDR, int));
+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 *));
-#if 0
static void
-record_minimal_symbol PARAMS ((char *, CORE_ADDR, enum minimal_symbol_type,
- struct objfile *));
-#endif
+free_elfinfo PARAMS ((void *));
+
+static struct section_offsets *
+elf_symfile_offsets PARAMS ((struct objfile *, CORE_ADDR));
static void
record_minimal_symbol_and_info PARAMS ((char *, CORE_ADDR,
struct objfile *));
static void
-elf_locate_sections PARAMS ((bfd *, asection *, PTR));
+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
We also recognize the ".stab" sections used by the Sun compilers
released with Solaris 2.
- FIXME: The section names should not be hardwired strings. */
+ 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
elf_locate_sections (ignore_abfd, sectp, eip)
#endif
-/*
-
-LOCAL FUNCTION
-
- record_minimal_symbol -- add entry to minimal symbol table
-
-SYNOPSIS
-
- 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
- minimal symbol table and the address associated with that symbol, records
- this information for later use in building the minimal symbol table.
-
- */
-
-#if 0 /* FIXME: Unused */
-
-static void
-record_minimal_symbol (name, address, ms_type, objfile)
- char *name;
- CORE_ADDR address;
- enum minimal_symbol_type ms_type;
- struct objfile *objfile;
-{
- name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
- prim_record_minimal_symbol (name, address, ms_type);
-}
-
-#endif
-
static void
record_minimal_symbol_and_info (name, address, ms_type, info, objfile)
char *name;
char *info; /* FIXME, is this really char *? */
struct objfile *objfile;
{
+ int section;
+
+ /* 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;
+ 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;
+ }
+
name = obsavestring (name, strlen (name), &objfile -> symbol_obstack);
- prim_record_minimal_symbol_and_info (name, address, ms_type, info);
+ prim_record_minimal_symbol_and_info (name, address, ms_type, info, section);
}
/*
or not (may be shared library for example), add all the global
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
asymbol **symbol_table;
unsigned int number_of_symbols;
unsigned int i;
+ int index;
struct cleanup *back_to;
CORE_ADDR symaddr;
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;
+ struct dbx_symfile_info *dbx = (struct dbx_symfile_info *)
+ objfile->sym_stab_info;
+ unsigned long size;
storage_needed = get_symtab_upper_bound (abfd);
-
if (storage_needed > 0)
{
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/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 (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;
+ }
+ else if (sym -> flags & (BSF_GLOBAL | BSF_LOCAL | BSF_WEAK))
{
- symaddr = sym -> value;
+ /* 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)
{
/* 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)
+ {
+ ms_type = mst_abs;
+ }
+ else if (sym -> section -> flags & SEC_CODE)
{
- ms_type = mst_text;
+ if (sym -> flags & BSF_GLOBAL)
+ {
+ ms_type = mst_text;
+ }
+ else if (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_DATA)
+ else if (sym -> section -> flags & SEC_ALLOC)
{
- ms_type = mst_data;
+ 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
{
/* 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 or data. */
+ is in. Ignore them if they aren't text, data, or bss. */
/* ms_type = mst_unknown; */
continue; /* Skip this symbol. */
}
/* Pass symbol size field in via BFD. FIXME!!! */
- record_minimal_symbol_and_info ((char *) sym -> name,
- symaddr, ms_type, sym->udata, objfile);
+ size = ((elf_symbol_type *) sym) -> internal_elf_sym.st_size;
+ record_minimal_symbol_and_info ((char *) sym -> name, symaddr,
+ ms_type, (PTR) size, objfile);
}
}
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).
capability even for files compiled without -g. */
static void
-elf_symfile_read (objfile, addr, mainline)
+elf_symfile_read (objfile, section_offsets, mainline)
struct objfile *objfile;
- CORE_ADDR addr;
+ struct section_offsets *section_offsets;
int mainline;
{
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. */
+ memset ((char *) &ei, 0, sizeof (ei));
- text_sect = bfd_get_section_by_name (objfile -> obfd, ".text");
- offset = addr - bfd_section_vma (objfile -> obfd, text_sect);
+ /* 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);
- /* Process the normal ELF symbol table first. */
+ /* 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);
/* Now process debugging information, which is contained in
special ELF sections. We first have to find them... */
- 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),
- offset, mainline,
+ dwarf_build_psymtabs (objfile,
+ section_offsets, mainline,
ei.dboffset, ei.dbsize,
- ei.lnoffset, ei.lnsize, objfile);
+ ei.lnoffset, ei.lnsize);
}
if (ei.stabsect)
{
sections visible to the caller. So we have to search the
ELF section table, not the BFD section table, for the string
table. */
- struct elf_internal_shdr *elf_sect;
+ struct elf32_internal_shdr *elf_sect;
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. */
+ section_offsets,
mainline,
ei.stabsect->filepos, /* .stab offset */
bfd_get_section_size_before_reloc (ei.stabsect),/* .stab size */
- elf_sect->sh_offset, /* .stabstr offset */
+ (file_ptr) elf_sect->sh_offset, /* .stabstr offset */
elf_sect->sh_size); /* .stabstr size */
}
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).
elf_new_init (ignore)
struct objfile *ignore;
{
+ stabsread_new_init ();
buildsym_new_init ();
}
elf_symfile_finish (objfile)
struct objfile *objfile;
{
- if (objfile -> sym_private != NULL)
+ if (objfile -> sym_stab_info != NULL)
{
- mfree (objfile -> md, objfile -> sym_private);
+ mfree (objfile -> md, objfile -> sym_stab_info);
}
}
{
}
+/* 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. */
+/* Register that we are able to handle ELF object file formats. */
static struct sym_fns elf_sym_fns =
{
elf_symfile_init, /* sym_init: read initial info, setup for sym_read() */
elf_symfile_read, /* sym_read: read a symbol file into symtab */
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 */
};
projects / binutils-gdb.git / blobdiff