diff options
Diffstat (limited to 'gdb/objfiles.c')
| -rw-r--r-- | gdb/objfiles.c | 1002 |
1 files changed, 0 insertions, 1002 deletions
diff --git a/gdb/objfiles.c b/gdb/objfiles.c deleted file mode 100644 index e2a6f850554..00000000000 --- a/gdb/objfiles.c +++ /dev/null @@ -1,1002 +0,0 @@ -/* GDB routines for manipulating objfiles. - Copyright 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001 - Free Software Foundation, Inc. - Contributed by Cygnus Support, using pieces from other GDB modules. - - This file is part of GDB. - - This program is free software; you can redistribute it and/or modify - it under the terms of the GNU General Public License as published by - the Free Software Foundation; either version 2 of the License, or - (at your option) any later version. - - This program is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - GNU General Public License for more details. - - 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., 59 Temple Place - Suite 330, - Boston, MA 02111-1307, USA. */ - -/* This file contains support routines for creating, manipulating, and - destroying objfile structures. */ - -#include "defs.h" -#include "bfd.h" /* Binary File Description */ -#include "symtab.h" -#include "symfile.h" -#include "objfiles.h" -#include "gdb-stabs.h" -#include "target.h" - -#include <sys/types.h> -#include "gdb_stat.h" -#include <fcntl.h> -#include "obstack.h" -#include "gdb_string.h" - -#include "breakpoint.h" - -/* Prototypes for local functions */ - -#if defined(USE_MMALLOC) && defined(HAVE_MMAP) - -#include "mmalloc.h" - -static int open_existing_mapped_file (char *, long, int); - -static int open_mapped_file (char *filename, long mtime, int flags); - -static PTR map_to_file (int); - -#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */ - -static void add_to_objfile_sections (bfd *, sec_ptr, PTR); - -/* 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. */ - -#ifndef TARGET_KEEP_SECTION -#define TARGET_KEEP_SECTION(ASECT) 0 -#endif - -/* Called via bfd_map_over_sections to build up the section table that - the objfile references. The objfile contains pointers to the start - of the table (objfile->sections) and to the first location after - the end of the table (objfile->sections_end). */ - -static void -add_to_objfile_sections (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) && !(TARGET_KEEP_SECTION (asect))) - return; - - if (0 == bfd_section_size (abfd, asect)) - return; - section.offset = 0; - section.objfile = objfile; - section.the_bfd_section = asect; - section.ovly_mapped = 0; - section.addr = bfd_section_vma (abfd, asect); - section.endaddr = section.addr + bfd_section_size (abfd, asect); - obstack_grow (&objfile->psymbol_obstack, (char *) §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). - - Note that while we are building the table, which goes into the - psymbol obstack, we hijack the sections_end pointer to instead hold - a count of the number of sections. When bfd_map_over_sections - returns, this count is used to compute the pointer to the end of - the sections table, which then overwrites the count. - - Also note that the OFFSET and OVLY_MAPPED in each table entry - are initialized to zero. - - Also note that if anything else writes to the psymbol obstack while - we are building the table, we're pretty much hosed. */ - -int -build_objfile_section_table (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 some flag bits - allocate a new objfile struct, fill it in as best we can, link it - into the list of all known objfiles, and return a pointer to the - new objfile struct. - - The FLAGS word contains various bits (OBJF_*) that can be taken as - requests for specific operations, like trying to open a mapped - version of the objfile (OBJF_MAPPED). Other bits like - OBJF_SHARED are simply copied through to the new objfile flags - member. */ - -struct objfile * -allocate_objfile (bfd *abfd, int flags) -{ - struct objfile *objfile = NULL; - struct objfile *last_one = NULL; - - if (mapped_symbol_files) - flags |= OBJF_MAPPED; - -#if defined(USE_MMALLOC) && defined(HAVE_MMAP) - if (abfd != NULL) - { - - /* 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), - flags); - if (fd >= 0) - { - PTR md; - - if ((md = map_to_file (fd)) == 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_cache.cache, xmmalloc); - obstack_freefun (&objfile->psymbol_cache.cache, xmfree); - obstack_chunkfun (&objfile->psymbol_obstack, xmmalloc); - obstack_freefun (&objfile->psymbol_obstack, xmfree); - obstack_chunkfun (&objfile->symbol_obstack, xmmalloc); - obstack_freefun (&objfile->symbol_obstack, xmfree); - obstack_chunkfun (&objfile->type_obstack, xmmalloc); - obstack_freefun (&objfile->type_obstack, xmfree); - /* 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_cache.cache, - 0, 0, xmmalloc, xmfree, - objfile->md); - obstack_specify_allocation_with_arg (&objfile->psymbol_obstack, - 0, 0, xmmalloc, xmfree, - objfile->md); - obstack_specify_allocation_with_arg (&objfile->symbol_obstack, - 0, 0, xmmalloc, xmfree, - objfile->md); - obstack_specify_allocation_with_arg (&objfile->type_obstack, - 0, 0, xmmalloc, xmfree, - objfile->md); - } - } - - if ((flags & OBJF_MAPPED) && (objfile == NULL)) - { - warning ("symbol table for '%s' will not be mapped", - bfd_get_filename (abfd)); - flags &= ~OBJF_MAPPED; - } - } -#else /* !defined(USE_MMALLOC) || !defined(HAVE_MMAP) */ - - if (flags & OBJF_MAPPED) - { - 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 - "mapped" keyword again. */ - - mapped_symbol_files = 0; - flags &= ~OBJF_MAPPED; - } - -#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */ - - /* If we don't support mapped symbol files, didn't ask for the file to be - mapped, or failed to open the mapped file for some reason, then revert - back to an unmapped objfile. */ - - if (objfile == NULL) - { - objfile = (struct objfile *) xmalloc (sizeof (struct objfile)); - memset (objfile, 0, sizeof (struct objfile)); - objfile->md = NULL; - obstack_specify_allocation (&objfile->psymbol_cache.cache, 0, 0, - xmalloc, xfree); - obstack_specify_allocation (&objfile->psymbol_obstack, 0, 0, xmalloc, - xfree); - obstack_specify_allocation (&objfile->symbol_obstack, 0, 0, xmalloc, - xfree); - obstack_specify_allocation (&objfile->type_obstack, 0, 0, xmalloc, - xfree); - flags &= ~OBJF_MAPPED; - } - - /* Update the per-objfile information that comes from the bfd, ensuring - that any data that is reference is saved in the per-objfile data - region. */ - - objfile->obfd = abfd; - if (objfile->name != NULL) - { - xmfree (objfile->md, objfile->name); - } - if (abfd != NULL) - { - objfile->name = mstrsave (objfile->md, bfd_get_filename (abfd)); - objfile->mtime = bfd_get_mtime (abfd); - - /* 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 ())); - } - } - - /* Initialize the section indexes for this objfile, so that we can - later detect if they are used w/o being properly assigned to. */ - - objfile->sect_index_text = -1; - objfile->sect_index_data = -1; - objfile->sect_index_bss = -1; - objfile->sect_index_rodata = -1; - - /* 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; - } - - /* Save passed in flag bits. */ - objfile->flags |= flags; - - return (objfile); -} - -/* Put OBJFILE at the front of the list. */ - -void -objfile_to_front (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. - - It is not a bug, or error, to call this function if OBJFILE is not known - to be in the current list. This is done in the case of mapped objfiles, - for example, just to ensure that the mapped objfile doesn't appear twice - in the list. Since the list is threaded, linking in a mapped objfile - twice would create a circular list. - - If OBJFILE turns out to be in the list, we zap it's NEXT pointer after - unlinking it, just to ensure that we have completely severed any linkages - between the OBJFILE and the list. */ - -void -unlink_objfile (struct objfile *objfile) -{ - struct objfile **objpp; - - for (objpp = &object_files; *objpp != NULL; objpp = &((*objpp)->next)) - { - if (*objpp == objfile) - { - *objpp = (*objpp)->next; - objfile->next = NULL; - return; - } - } - - internal_error (__FILE__, __LINE__, - "unlink_objfile: objfile already unlinked"); -} - - -/* Destroy an objfile and all the symtabs and psymtabs under it. Note - that as much as possible is allocated on the symbol_obstack and - psymbol_obstack, so that the memory can be efficiently freed. - - Things which we do NOT free because they are not in malloc'd memory - or not in memory specific to the objfile include: - - objfile -> sf - - FIXME: If the objfile is using reusable symbol information (via mmalloc), - then we need to take into account the fact that more than one process - may be using the symbol information at the same time (when mmalloc is - extended to support cooperative locking). When more than one process - is using the mapped symbol info, we need to be more careful about when - we free objects in the reusable area. */ - -void -free_objfile (struct objfile *objfile) -{ - /* 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 - these routines is responsible for doing the correct thing, either - freeing things which are valid only during this particular gdb - execution, or leaving them to be reused during the next one. */ - - if (objfile->sf != NULL) - { - (*objfile->sf->sym_finish) (objfile); - } - - /* We always close the bfd. */ - - if (objfile->obfd != NULL) - { - char *name = bfd_get_filename (objfile->obfd); - if (!bfd_close (objfile->obfd)) - warning ("cannot close \"%s\": %s", - name, bfd_errmsg (bfd_get_error ())); - xfree (name); - } - - /* Remove it from the chain of all objfiles. */ - - unlink_objfile (objfile); - - /* 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 - linkage unit, gdb used to do these things whenever the monolithic - symbol table was blown away. How much still needs to be done - is unknown, but we play it safe for now and keep each action until - it is shown to be no longer needed. */ - - /* I *think* all our callers call clear_symtab_users. If so, no need - to call this here. */ - clear_pc_function_cache (); - - /* 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 xmfree() is - the last thing we can do with this objfile. */ - -#if defined(USE_MMALLOC) && defined(HAVE_MMAP) - - if (objfile->flags & OBJF_MAPPED) - { - /* 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; - close (mmfd); - } - -#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */ - - /* If we still have an objfile, then either we don't support reusable - objfiles or this one was not reusable. So free it normally. */ - - if (objfile != NULL) - { - if (objfile->name != NULL) - { - xmfree (objfile->md, objfile->name); - } - if (objfile->global_psymbols.list) - xmfree (objfile->md, objfile->global_psymbols.list); - if (objfile->static_psymbols.list) - xmfree (objfile->md, objfile->static_psymbols.list); - /* Free the obstacks for non-reusable objfiles */ - free_bcache (&objfile->psymbol_cache); - obstack_free (&objfile->psymbol_obstack, 0); - obstack_free (&objfile->symbol_obstack, 0); - obstack_free (&objfile->type_obstack, 0); - xmfree (objfile->md, objfile); - objfile = NULL; - } -} - -static void -do_free_objfile_cleanup (void *obj) -{ - free_objfile (obj); -} - -struct cleanup * -make_cleanup_free_objfile (struct objfile *obj) -{ - return make_cleanup (do_free_objfile_cleanup, obj); -} - -/* Free all the object files at once and clean up their users. */ - -void -free_all_objfiles (void) -{ - struct objfile *objfile, *temp; - - ALL_OBJFILES_SAFE (objfile, temp) - { - free_objfile (objfile); - } - clear_symtab_users (); -} - -/* Relocate OBJFILE to NEW_OFFSETS. There should be OBJFILE->NUM_SECTIONS - entries in new_offsets. */ -void -objfile_relocate (struct objfile *objfile, struct section_offsets *new_offsets) -{ - struct section_offsets *delta = - (struct section_offsets *) alloca (SIZEOF_SECTION_OFFSETS); - - { - int i; - int something_changed = 0; - for (i = 0; i < objfile->num_sections; ++i) - { - delta->offsets[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; - struct symbol *sym; - 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); - - ALL_BLOCK_SYMBOLS (b, j, sym) - { - fixup_symbol_section (sym, objfile); - - /* 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_CLASS (sym) == LOC_INDIRECT) - && 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 (objfile)); - p->texthigh += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); - } - } - - { - struct partial_symbol **psym; - - for (psym = objfile->global_psymbols.list; - psym < objfile->global_psymbols.next; - psym++) - { - fixup_psymbol_section (*psym, objfile); - 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++) - { - fixup_psymbol_section (*psym, objfile); - 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) - (objfile->section_offsets)->offsets[i] = ANOFFSET (new_offsets, i); - } - - if (objfile->ei.entry_point != ~(CORE_ADDR) 0) - { - /* Relocate ei.entry_point with its section offset, use SECT_OFF_TEXT - only as a fallback. */ - struct obj_section *s; - s = find_pc_section (objfile->ei.entry_point); - if (s) - objfile->ei.entry_point += ANOFFSET (delta, s->the_bfd_section->index); - else - objfile->ei.entry_point += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); - } - - { - struct obj_section *s; - bfd *abfd; - - abfd = objfile->obfd; - - ALL_OBJFILE_OSECTIONS (objfile, s) - { - int idx = s->the_bfd_section->index; - - s->addr += ANOFFSET (delta, idx); - s->endaddr += ANOFFSET (delta, idx); - } - } - - if (objfile->ei.entry_func_lowpc != INVALID_ENTRY_LOWPC) - { - objfile->ei.entry_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); - objfile->ei.entry_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); - } - - if (objfile->ei.entry_file_lowpc != INVALID_ENTRY_LOWPC) - { - objfile->ei.entry_file_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); - objfile->ei.entry_file_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); - } - - if (objfile->ei.main_func_lowpc != INVALID_ENTRY_LOWPC) - { - objfile->ei.main_func_lowpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); - objfile->ei.main_func_highpc += ANOFFSET (delta, SECT_OFF_TEXT (objfile)); - } - - /* Relocate breakpoints as necessary, after things are relocated. */ - breakpoint_re_set (); -} - -/* 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. */ - -int -have_partial_symbols (void) -{ - struct objfile *ofp; - - ALL_OBJFILES (ofp) - { - if (ofp->psymtabs != NULL) - { - return 1; - } - } - return 0; -} - -/* Many places in gdb want to test just to see if we have any full - symbols available. This function returns zero if none are currently - available, nonzero otherwise. */ - -int -have_full_symbols (void) -{ - struct objfile *ofp; - - ALL_OBJFILES (ofp) - { - if (ofp->symtabs != NULL) - { - return 1; - } - } - return 0; -} - - -/* This operations deletes all objfile entries that represent solibs that - weren't explicitly loaded by the user, via e.g., the add-symbol-file - command. - */ -void -objfile_purge_solibs (void) -{ - struct objfile *objf; - struct objfile *temp; - - ALL_OBJFILES_SAFE (objf, temp) - { - /* We assume that the solib package has been purged already, or will - be soon. - */ - if (!(objf->flags & OBJF_USERLOADED) && (objf->flags & OBJF_SHARED)) - free_objfile (objf); - } -} - - -/* Many places in gdb want to test just to see if we have any minimal - symbols available. This function returns zero if none are currently - available, nonzero otherwise. */ - -int -have_minimal_symbols (void) -{ - struct objfile *ofp; - - ALL_OBJFILES (ofp) - { - if (ofp->msymbols != NULL) - { - return 1; - } - } - return 0; -} - -#if defined(USE_MMALLOC) && defined(HAVE_MMAP) - -/* Given the name of a mapped symbol file in SYMSFILENAME, and the timestamp - of the corresponding symbol file in MTIME, try to open an existing file - with the name SYMSFILENAME and verify it is more recent than the base - file by checking it's timestamp against MTIME. - - If SYMSFILENAME does not exist (or can't be stat'd), simply returns -1. - - If SYMSFILENAME does exist, but is out of date, we check to see if the - user has specified creation of a mapped file. If so, we don't issue - any warning message because we will be creating a new mapped file anyway, - overwriting the old one. If not, then we issue a warning message so that - the user will know why we aren't using this existing mapped symbol file. - In either case, we return -1. - - If SYMSFILENAME does exist and is not out of date, but can't be opened for - some reason, then prints an appropriate system error message and returns -1. - - Otherwise, returns the open file descriptor. */ - -static int -open_existing_mapped_file (char *symsfilename, long mtime, int flags) -{ - int fd = -1; - struct stat sbuf; - - if (stat (symsfilename, &sbuf) == 0) - { - if (sbuf.st_mtime < mtime) - { - if (!(flags & OBJF_MAPPED)) - { - 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_unfiltered (error_pre_print); - } - print_sys_errmsg (symsfilename, errno); - } - } - return (fd); -} - -/* Look for a mapped symbol file that corresponds to FILENAME and is more - recent than MTIME. If MAPPED is nonzero, the user has asked that gdb - use a mapped symbol file for this file, so create a new one if one does - not currently exist. - - If found, then return an open file descriptor for the file, otherwise - return -1. - - This routine is responsible for implementing the policy that generates - the name of the mapped symbol file from the name of a file containing - symbols that gdb would like to read. Currently this policy is to append - ".syms" to the name of the file. - - This routine is also responsible for implementing the policy that - determines where the mapped symbol file is found (the search path). - This policy is that when reading an existing mapped file, a file of - the correct name in the current directory takes precedence over a - file of the correct name in the same directory as the symbol file. - When creating a new mapped file, it is always created in the current - directory. This helps to minimize the chances of a user unknowingly - creating big mapped files in places like /bin and /usr/local/bin, and - allows a local copy to override a manually installed global copy (in - /bin for example). */ - -static int -open_mapped_file (char *filename, long mtime, int flags) -{ - int fd; - char *symsfilename; - - /* First try to open an existing file in the current directory, and - then try the directory where the symbol file is located. */ - - symsfilename = concat ("./", lbasename (filename), ".syms", (char *) NULL); - if ((fd = open_existing_mapped_file (symsfilename, mtime, flags)) < 0) - { - xfree (symsfilename); - symsfilename = concat (filename, ".syms", (char *) NULL); - fd = open_existing_mapped_file (symsfilename, mtime, flags); - } - - /* If we don't have an open file by now, then either the file does not - already exist, or the base file has changed since it was created. In - either case, if the user has specified use of a mapped file, then - create a new mapped file, truncating any existing one. If we can't - create one, print a system error message saying why we can't. - - By default the file is rw for everyone, with the user's umask taking - care of turning off the permissions the user wants off. */ - - if ((fd < 0) && (flags & OBJF_MAPPED)) - { - xfree (symsfilename); - symsfilename = concat ("./", lbasename (filename), ".syms", - (char *) NULL); - if ((fd = open (symsfilename, O_RDWR | O_CREAT | O_TRUNC, 0666)) < 0) - { - if (error_pre_print) - { - printf_unfiltered (error_pre_print); - } - print_sys_errmsg (symsfilename, errno); - } - } - - xfree (symsfilename); - return (fd); -} - -static PTR -map_to_file (int fd) -{ - PTR md; - CORE_ADDR mapto; - - md = mmalloc_attach (fd, (PTR) 0); - if (md != NULL) - { - mapto = (CORE_ADDR) mmalloc_getkey (md, 1); - md = mmalloc_detach (md); - if (md != NULL) - { - /* FIXME: should figure out why detach failed */ - md = NULL; - } - else if (mapto != (CORE_ADDR) NULL) - { - /* This mapping file needs to be remapped at "mapto" */ - md = mmalloc_attach (fd, (PTR) mapto); - } - else - { - /* This is a freshly created mapping file. */ - mapto = (CORE_ADDR) mmalloc_findbase (20 * 1024 * 1024); - if (mapto != 0) - { - /* To avoid reusing the freshly created mapping file, at the - address selected by mmap, we must truncate it before trying - to do an attach at the address we want. */ - ftruncate (fd, 0); - md = mmalloc_attach (fd, (PTR) mapto); - if (md != NULL) - { - mmalloc_setkey (md, 1, (PTR) mapto); - } - } - } - } - return (md); -} - -#endif /* defined(USE_MMALLOC) && defined(HAVE_MMAP) */ - -/* Returns a section whose range includes PC and SECTION, - or NULL if none found. Note the distinction between the return type, - struct obj_section (which is defined in gdb), and the input type - struct sec (which is a bfd-defined data type). The obj_section - contains a pointer to the bfd struct sec section. */ - -struct obj_section * -find_pc_sect_section (CORE_ADDR pc, struct sec *section) -{ - struct obj_section *s; - struct objfile *objfile; - - ALL_OBJSECTIONS (objfile, s) - if ((section == 0 || section == s->the_bfd_section) && - s->addr <= pc && pc < s->endaddr) - return (s); - - return (NULL); -} - -/* Returns a section whose range includes PC or NULL if none found. - Backward compatibility, no section. */ - -struct obj_section * -find_pc_section (CORE_ADDR pc) -{ - return find_pc_sect_section (pc, find_pc_mapped_section (pc)); -} - - -/* 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 (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); -} - -/* Return nonzero if NAME is in the import list of OBJFILE. Else - return zero. */ - -int -is_in_import_list (char *name, struct objfile *objfile) -{ - register int i; - - if (!objfile || !name || !*name) - return 0; - - for (i = 0; i < objfile->import_list_size; i++) - if (objfile->import_list[i] && STREQ (name, objfile->import_list[i])) - return 1; - return 0; -} - |