/* GDB routines for manipulating objfiles.
- Copyright 1992 Free Software Foundation, Inc.
+ Copyright 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
Contributed by Cygnus Support, using pieces from other GDB modules.
This file is part of GDB.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
-Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
+Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* This file contains support routines for creating, manipulating, and
destroying objfile structures. */
#include "symtab.h"
#include "symfile.h"
#include "objfiles.h"
+#include "gdb-stabs.h"
+#include "target.h"
#include <sys/types.h>
-#include <sys/stat.h>
+#include "gdb_stat.h"
#include <fcntl.h>
-#include <obstack.h>
+#include "obstack.h"
+#include "gdb_string.h"
/* Prototypes for local functions */
#endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
-/* Message to be printed before the error message, when an error occurs. */
-
-extern char *error_pre_print;
-
/* Externally visible variables that are owned by this module.
See declarations in objfile.h for more info. */
struct objfile *object_files; /* Linked list of all objfiles */
struct objfile *current_objfile; /* For symbol file being read in */
struct objfile *symfile_objfile; /* Main symbol table loaded from */
+struct objfile *rt_common_objfile; /* For runtime common symbols */
int mapped_symbol_files; /* Try to use mapped symbol files */
+/* Locate all mappable sections of a BFD file.
+ objfile_p_char is a char * to get it through
+ bfd_map_over_sections; we cast it back to its proper type. */
+
+static void
+add_to_objfile_sections (abfd, asect, objfile_p_char)
+ bfd *abfd;
+ sec_ptr asect;
+ PTR objfile_p_char;
+{
+ struct objfile *objfile = (struct objfile *) objfile_p_char;
+ struct obj_section section;
+ flagword aflag;
+
+ aflag = bfd_get_section_flags (abfd, asect);
+ if (!(aflag & SEC_ALLOC))
+ return;
+ if (0 == bfd_section_size (abfd, asect))
+ return;
+ section.offset = 0;
+ section.objfile = objfile;
+ section.the_bfd_section = asect;
+ section.addr = bfd_section_vma (abfd, asect);
+ section.endaddr = section.addr + bfd_section_size (abfd, asect);
+ obstack_grow (&objfile->psymbol_obstack, §ion, sizeof(section));
+ objfile->sections_end = (struct obj_section *) (((unsigned long) objfile->sections_end) + 1);
+}
+
+/* Builds a section table for OBJFILE.
+ Returns 0 if OK, 1 on error (in which case bfd_error contains the
+ error). */
+
+int
+build_objfile_section_table (objfile)
+ struct objfile *objfile;
+{
+ /* objfile->sections can be already set when reading a mapped symbol
+ file. I believe that we do need to rebuild the section table in
+ this case (we rebuild other things derived from the bfd), but we
+ can't free the old one (it's in the psymbol_obstack). So we just
+ waste some memory. */
+
+ objfile->sections_end = 0;
+ bfd_map_over_sections (objfile->obfd, add_to_objfile_sections, (char *)objfile);
+ objfile->sections = (struct obj_section *)
+ obstack_finish (&objfile->psymbol_obstack);
+ objfile->sections_end = objfile->sections + (unsigned long) objfile->sections_end;
+ return(0);
+}
+
/* Given a pointer to an initialized bfd (ABFD) and a flag that indicates
whether or not an objfile is to be mapped (MAPPED), allocate a new objfile
struct, fill it in as best we can, link it into the list of all known
int mapped;
{
struct objfile *objfile = NULL;
- int fd;
- void *md;
- CORE_ADDR mapto;
+ struct objfile *last_one = NULL;
mapped |= mapped_symbol_files;
#if !defined(NO_MMALLOC) && defined(HAVE_MMAP)
-
- /* If we can support mapped symbol files, try to open/reopen the mapped file
- that corresponds to the file from which we wish to read symbols. If the
- objfile is to be mapped, we must malloc the structure itself using the
- mmap version, and arrange that all memory allocation for the objfile uses
- the mmap routines. If we are reusing an existing mapped file, from which
- we get our objfile pointer, we have to make sure that we update the
- pointers to the alloc/free functions in the obstack, in case these
- functions have moved within the current gdb. */
-
- fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd),
- mapped);
- if (fd >= 0)
- {
- if (((mapto = map_to_address ()) == 0) ||
- ((md = mmalloc_attach (fd, (void *) mapto)) == NULL))
- {
- (void) close (fd);
- }
- else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL)
- {
- /* Update memory corruption handler function addresses. */
- init_malloc (md);
- objfile -> md = md;
- objfile -> mmfd = fd;
- /* Update pointers to functions to *our* copies */
- obstack_chunkfun (&objfile -> psymbol_obstack, xmmalloc);
- obstack_freefun (&objfile -> psymbol_obstack, mfree);
- obstack_chunkfun (&objfile -> symbol_obstack, xmmalloc);
- obstack_freefun (&objfile -> symbol_obstack, mfree);
- obstack_chunkfun (&objfile -> type_obstack, xmmalloc);
- obstack_freefun (&objfile -> type_obstack, mfree);
- /* If already in objfile list, unlink it. */
- unlink_objfile (objfile);
- /* Forget things specific to a particular gdb, may have changed. */
- objfile -> sf = NULL;
- }
- else
- {
- /* Set up to detect internal memory corruption. MUST be done before
- the first malloc. See comments in init_malloc() and mmcheck(). */
- init_malloc (md);
- objfile = (struct objfile *) xmmalloc (md, sizeof (struct objfile));
- (void) memset (objfile, 0, sizeof (struct objfile));
- objfile -> md = md;
- objfile -> mmfd = fd;
- objfile -> flags |= OBJF_MAPPED;
- mmalloc_setkey (objfile -> md, 0, objfile);
- obstack_full_begin (&objfile -> psymbol_obstack, 0, 0,
- xmmalloc, mfree, objfile -> md,
- OBSTACK_MMALLOC_LIKE);
- obstack_full_begin (&objfile -> symbol_obstack, 0, 0,
- xmmalloc, mfree, objfile -> md,
- OBSTACK_MMALLOC_LIKE);
- obstack_full_begin (&objfile -> type_obstack, 0, 0,
- xmmalloc, mfree, objfile -> md,
- OBSTACK_MMALLOC_LIKE);
- }
- }
-
- if (mapped && (objfile == NULL))
- {
- warning ("symbol table for '%s' will not be mapped",
- bfd_get_filename (abfd));
- }
-
+ {
+
+ /* If we can support mapped symbol files, try to open/reopen the
+ mapped file that corresponds to the file from which we wish to
+ read symbols. If the objfile is to be mapped, we must malloc
+ the structure itself using the mmap version, and arrange that
+ all memory allocation for the objfile uses the mmap routines.
+ If we are reusing an existing mapped file, from which we get
+ our objfile pointer, we have to make sure that we update the
+ pointers to the alloc/free functions in the obstack, in case
+ these functions have moved within the current gdb. */
+
+ int fd;
+
+ fd = open_mapped_file (bfd_get_filename (abfd), bfd_get_mtime (abfd),
+ mapped);
+ if (fd >= 0)
+ {
+ CORE_ADDR mapto;
+ PTR md;
+
+ if (((mapto = map_to_address ()) == 0) ||
+ ((md = mmalloc_attach (fd, (PTR) mapto)) == NULL))
+ {
+ close (fd);
+ }
+ else if ((objfile = (struct objfile *) mmalloc_getkey (md, 0)) != NULL)
+ {
+ /* Update memory corruption handler function addresses. */
+ init_malloc (md);
+ objfile -> md = md;
+ objfile -> mmfd = fd;
+ /* Update pointers to functions to *our* copies */
+ obstack_chunkfun (&objfile -> psymbol_obstack, xmmalloc);
+ obstack_freefun (&objfile -> psymbol_obstack, mfree);
+ obstack_chunkfun (&objfile -> symbol_obstack, xmmalloc);
+ obstack_freefun (&objfile -> symbol_obstack, mfree);
+ obstack_chunkfun (&objfile -> type_obstack, xmmalloc);
+ obstack_freefun (&objfile -> type_obstack, mfree);
+ /* If already in objfile list, unlink it. */
+ unlink_objfile (objfile);
+ /* Forget things specific to a particular gdb, may have changed. */
+ objfile -> sf = NULL;
+ }
+ else
+ {
+
+ /* Set up to detect internal memory corruption. MUST be
+ done before the first malloc. See comments in
+ init_malloc() and mmcheck(). */
+
+ init_malloc (md);
+
+ objfile = (struct objfile *)
+ xmmalloc (md, sizeof (struct objfile));
+ memset (objfile, 0, sizeof (struct objfile));
+ objfile -> md = md;
+ objfile -> mmfd = fd;
+ objfile -> flags |= OBJF_MAPPED;
+ mmalloc_setkey (objfile -> md, 0, objfile);
+ obstack_specify_allocation_with_arg (&objfile -> psymbol_obstack,
+ 0, 0, xmmalloc, mfree,
+ objfile -> md);
+ obstack_specify_allocation_with_arg (&objfile -> symbol_obstack,
+ 0, 0, xmmalloc, mfree,
+ objfile -> md);
+ obstack_specify_allocation_with_arg (&objfile -> type_obstack,
+ 0, 0, xmmalloc, mfree,
+ objfile -> md);
+ }
+ }
+
+ if (mapped && (objfile == NULL))
+ {
+ warning ("symbol table for '%s' will not be mapped",
+ bfd_get_filename (abfd));
+ }
+ }
#else /* defined(NO_MMALLOC) || !defined(HAVE_MMAP) */
if (mapped)
{
- warning ("this version of gdb does not support mapped symbol tables.");
+ warning ("mapped symbol tables are not supported on this machine; missing or broken mmap().");
/* Turn off the global flag so we don't try to do mapped symbol tables
any more, which shuts up gdb unless the user specifically gives the
if (objfile == NULL)
{
objfile = (struct objfile *) xmalloc (sizeof (struct objfile));
- (void) memset (objfile, 0, sizeof (struct objfile));
+ memset (objfile, 0, sizeof (struct objfile));
objfile -> md = NULL;
- obstack_full_begin (&objfile -> psymbol_obstack, 0, 0, xmalloc, free,
- (void *) 0, 0);
- obstack_full_begin (&objfile -> symbol_obstack, 0, 0, xmalloc, free,
- (void *) 0, 0);
- obstack_full_begin (&objfile -> type_obstack, 0, 0, xmalloc, free,
- (void *) 0, 0);
-
+ obstack_specify_allocation (&objfile -> psymbol_obstack, 0, 0, xmalloc,
+ free);
+ obstack_specify_allocation (&objfile -> symbol_obstack, 0, 0, xmalloc,
+ free);
+ obstack_specify_allocation (&objfile -> type_obstack, 0, 0, xmalloc,
+ free);
}
/* Update the per-objfile information that comes from the bfd, ensuring
objfile -> name = mstrsave (objfile -> md, bfd_get_filename (abfd));
objfile -> mtime = bfd_get_mtime (abfd);
- /* Push this file onto the head of the linked list of other such files. */
+ /* Build section table. */
+
+ if (build_objfile_section_table (objfile))
+ {
+ error ("Can't find the file sections in `%s': %s",
+ objfile -> name, bfd_errmsg (bfd_get_error ()));
+ }
- objfile -> next = object_files;
- object_files = objfile;
+ /* Add this file onto the tail of the linked list of other such files. */
+ objfile -> next = NULL;
+ if (object_files == NULL)
+ object_files = objfile;
+ else
+ {
+ for (last_one = object_files;
+ last_one -> next;
+ last_one = last_one -> next);
+ last_one -> next = objfile;
+ }
return (objfile);
}
+/* Put OBJFILE at the front of the list. */
+
+void
+objfile_to_front (objfile)
+ struct objfile *objfile;
+{
+ struct objfile **objp;
+ for (objp = &object_files; *objp != NULL; objp = &((*objp)->next))
+ {
+ if (*objp == objfile)
+ {
+ /* Unhook it from where it is. */
+ *objp = objfile->next;
+ /* Put it in the front. */
+ objfile->next = object_files;
+ object_files = objfile;
+ break;
+ }
+ }
+}
+
/* Unlink OBJFILE from the list of known objfiles, if it is found in the
list.
free_objfile (objfile)
struct objfile *objfile;
{
- struct objfile *ofp;
- int mmfd;
-
/* First do any symbol file specific actions required when we are
finished with a particular symbol file. Note that if the objfile
is using reusable symbol information (via mmalloc) then each of
if (objfile -> obfd != NULL)
{
- bfd_close (objfile -> obfd);
+ char *name = bfd_get_filename (objfile->obfd);
+ if (!bfd_close (objfile -> obfd))
+ warning ("cannot close \"%s\": %s",
+ name, bfd_errmsg (bfd_get_error ()));
+ free (name);
}
/* Remove it from the chain of all objfiles. */
unlink_objfile (objfile);
-#if 0 /* FIXME!! */
+ /* If we are going to free the runtime common objfile, mark it
+ as unallocated. */
+
+ if (objfile == rt_common_objfile)
+ rt_common_objfile = NULL;
/* Before the symbol table code was redone to make it easier to
selectively load and remove information particular to a specific
is unknown, but we play it safe for now and keep each action until
it is shown to be no longer needed. */
- clear_symtab_users_once ();
#if defined (CLEAR_SOLIB)
CLEAR_SOLIB ();
+ /* CLEAR_SOLIB closes the bfd's for any shared libraries. But
+ the to_sections for a core file might refer to those bfd's. So
+ detach any core file. */
+ {
+ struct target_ops *t = find_core_target ();
+ if (t != NULL)
+ (t->to_detach) (NULL, 0);
+ }
#endif
+ /* I *think* all our callers call clear_symtab_users. If so, no need
+ to call this here. */
clear_pc_function_cache ();
-#endif
-
/* The last thing we do is free the objfile struct itself for the
non-reusable case, or detach from the mapped file for the reusable
case. Note that the mmalloc_detach or the mfree is the last thing
{
/* Remember the fd so we can close it. We can't close it before
doing the detach, and after the detach the objfile is gone. */
+ int mmfd;
+
mmfd = objfile -> mmfd;
mmalloc_detach (objfile -> md);
objfile = NULL;
- (void) close (mmfd);
+ close (mmfd);
}
#endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
{
mfree (objfile -> md, objfile -> name);
}
+ if (objfile->global_psymbols.list)
+ mfree (objfile->md, objfile->global_psymbols.list);
+ if (objfile->static_psymbols.list)
+ mfree (objfile->md, objfile->static_psymbols.list);
/* Free the obstacks for non-reusable objfiles */
obstack_free (&objfile -> psymbol_obstack, 0);
obstack_free (&objfile -> symbol_obstack, 0);
}
-/* Free all the object files at once. */
+/* Free all the object files at once and clean up their users. */
void
free_all_objfiles ()
{
free_objfile (objfile);
}
+ clear_symtab_users ();
}
+\f
+/* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS
+ entries in new_offsets. */
+void
+objfile_relocate (objfile, new_offsets)
+ struct objfile *objfile;
+ struct section_offsets *new_offsets;
+{
+ struct section_offsets *delta = (struct section_offsets *) alloca
+ (sizeof (struct section_offsets)
+ + objfile->num_sections * sizeof (delta->offsets));
+
+ {
+ int i;
+ int something_changed = 0;
+ for (i = 0; i < objfile->num_sections; ++i)
+ {
+ ANOFFSET (delta, i) =
+ ANOFFSET (new_offsets, i) - ANOFFSET (objfile->section_offsets, i);
+ if (ANOFFSET (delta, i) != 0)
+ something_changed = 1;
+ }
+ if (!something_changed)
+ return;
+ }
+
+ /* OK, get all the symtabs. */
+ {
+ struct symtab *s;
+
+ ALL_OBJFILE_SYMTABS (objfile, s)
+ {
+ struct linetable *l;
+ struct blockvector *bv;
+ int i;
+
+ /* First the line table. */
+ l = LINETABLE (s);
+ if (l)
+ {
+ for (i = 0; i < l->nitems; ++i)
+ l->item[i].pc += ANOFFSET (delta, s->block_line_section);
+ }
+
+ /* Don't relocate a shared blockvector more than once. */
+ if (!s->primary)
+ continue;
+
+ bv = BLOCKVECTOR (s);
+ for (i = 0; i < BLOCKVECTOR_NBLOCKS (bv); ++i)
+ {
+ struct block *b;
+ int j;
+
+ b = BLOCKVECTOR_BLOCK (bv, i);
+ BLOCK_START (b) += ANOFFSET (delta, s->block_line_section);
+ BLOCK_END (b) += ANOFFSET (delta, s->block_line_section);
+
+ for (j = 0; j < BLOCK_NSYMS (b); ++j)
+ {
+ struct symbol *sym = BLOCK_SYM (b, j);
+ /* The RS6000 code from which this was taken skipped
+ any symbols in STRUCT_NAMESPACE or UNDEF_NAMESPACE.
+ But I'm leaving out that test, on the theory that
+ they can't possibly pass the tests below. */
+ if ((SYMBOL_CLASS (sym) == LOC_LABEL
+ || SYMBOL_CLASS (sym) == LOC_STATIC)
+ && SYMBOL_SECTION (sym) >= 0)
+ {
+ SYMBOL_VALUE_ADDRESS (sym) +=
+ ANOFFSET (delta, SYMBOL_SECTION (sym));
+ }
+#ifdef MIPS_EFI_SYMBOL_NAME
+ /* Relocate Extra Function Info for ecoff. */
+
+ else
+ if (SYMBOL_CLASS (sym) == LOC_CONST
+ && SYMBOL_NAMESPACE (sym) == LABEL_NAMESPACE
+ && STRCMP (SYMBOL_NAME (sym), MIPS_EFI_SYMBOL_NAME) == 0)
+ ecoff_relocate_efi (sym, ANOFFSET (delta, s->block_line_section));
+#endif
+ }
+ }
+ }
+ }
+
+ {
+ struct partial_symtab *p;
+
+ ALL_OBJFILE_PSYMTABS (objfile, p)
+ {
+ p->textlow += ANOFFSET (delta, SECT_OFF_TEXT);
+ p->texthigh += ANOFFSET (delta, SECT_OFF_TEXT);
+ }
+ }
+
+ {
+ struct partial_symbol *psym;
+
+ for (psym = objfile->global_psymbols.list;
+ psym < objfile->global_psymbols.next;
+ psym++)
+ if (SYMBOL_SECTION (psym) >= 0)
+ SYMBOL_VALUE_ADDRESS (psym) += ANOFFSET (delta, SYMBOL_SECTION (psym));
+ for (psym = objfile->static_psymbols.list;
+ psym < objfile->static_psymbols.next;
+ psym++)
+ if (SYMBOL_SECTION (psym) >= 0)
+ SYMBOL_VALUE_ADDRESS (psym) += ANOFFSET (delta, SYMBOL_SECTION (psym));
+ }
+
+ {
+ struct minimal_symbol *msym;
+ ALL_OBJFILE_MSYMBOLS (objfile, msym)
+ if (SYMBOL_SECTION (msym) >= 0)
+ SYMBOL_VALUE_ADDRESS (msym) += ANOFFSET (delta, SYMBOL_SECTION (msym));
+ }
+ /* Relocating different sections by different amounts may cause the symbols
+ to be out of order. */
+ msymbols_sort (objfile);
+
+ {
+ int i;
+ for (i = 0; i < objfile->num_sections; ++i)
+ ANOFFSET (objfile->section_offsets, i) = ANOFFSET (new_offsets, i);
+ }
+
+ {
+ struct obj_section *s;
+ bfd *abfd;
+
+ abfd = objfile->obfd;
+
+ for (s = objfile->sections;
+ s < objfile->sections_end; ++s)
+ {
+ flagword flags;
+
+ flags = bfd_get_section_flags (abfd, s->the_bfd_section);
+
+ if (flags & SEC_CODE)
+ {
+ s->addr += ANOFFSET (delta, SECT_OFF_TEXT);
+ s->endaddr += ANOFFSET (delta, SECT_OFF_TEXT);
+ }
+ else if (flags & (SEC_DATA | SEC_LOAD))
+ {
+ s->addr += ANOFFSET (delta, SECT_OFF_DATA);
+ s->endaddr += ANOFFSET (delta, SECT_OFF_DATA);
+ }
+ else if (flags & SEC_ALLOC)
+ {
+ s->addr += ANOFFSET (delta, SECT_OFF_BSS);
+ s->endaddr += ANOFFSET (delta, SECT_OFF_BSS);
+ }
+ }
+ }
+
+ if (objfile->ei.entry_point != ~0)
+ objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT);
+
+ if (objfile->ei.entry_func_lowpc != INVALID_ENTRY_LOWPC)
+ {
+ objfile->ei.entry_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT);
+ objfile->ei.entry_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT);
+ }
+ if (objfile->ei.entry_file_lowpc != INVALID_ENTRY_LOWPC)
+ {
+ objfile->ei.entry_file_lowpc += ANOFFSET (delta, SECT_OFF_TEXT);
+ objfile->ei.entry_file_highpc += ANOFFSET (delta, SECT_OFF_TEXT);
+ }
+
+ if (objfile->ei.main_func_lowpc != INVALID_ENTRY_LOWPC)
+ {
+ objfile->ei.main_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT);
+ objfile->ei.main_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT);
+ }
+}
+\f
/* Many places in gdb want to test just to see if we have any partial
symbols available. This function returns zero if none are currently
available, nonzero otherwise. */
{
if (!mapped)
{
- warning ("mapped symbol file `%s' is out of date", symsfilename);
+ warning ("mapped symbol file `%s' is out of date, ignored it",
+ symsfilename);
}
}
else if ((fd = open (symsfilename, O_RDWR)) < 0)
{
if (error_pre_print)
{
- printf (error_pre_print);
+ printf_unfiltered (error_pre_print);
}
print_sys_errmsg (symsfilename, errno);
}
{
if (error_pre_print)
{
- printf (error_pre_print);
+ printf_unfiltered (error_pre_print);
}
print_sys_errmsg (symsfilename, errno);
}
#else
+ warning ("need to recompile gdb with MMAP_BASE_ADDRESS and MMAP_INCREMENT defined");
return (0);
#endif
#endif /* !defined(NO_MMALLOC) && defined(HAVE_MMAP) */
+/* Returns a section whose range includes PC or NULL if none found. */
+
+struct obj_section *
+find_pc_section(pc)
+ CORE_ADDR pc;
+{
+ struct obj_section *s;
+ struct objfile *objfile;
+
+ ALL_OBJFILES (objfile)
+ for (s = objfile->sections; s < objfile->sections_end; ++s)
+ if (s->addr <= pc
+ && pc < s->endaddr)
+ return(s);
+
+ return(NULL);
+}
+
+/* In SVR4, we recognize a trampoline by it's section name.
+ That is, if the pc is in a section named ".plt" then we are in
+ a trampoline. */
+
+int
+in_plt_section(pc, name)
+ CORE_ADDR pc;
+ char *name;
+{
+ struct obj_section *s;
+ int retval = 0;
+
+ s = find_pc_section(pc);
+
+ retval = (s != NULL
+ && s->the_bfd_section->name != NULL
+ && STREQ (s->the_bfd_section->name, ".plt"));
+ return(retval);
+}
projects / binutils.git / blobdiff