+/* Remove the breakpoint that we inserted in __dbx_link().
+ Does nothing if the breakpoint hasn't been inserted or has already
+ been removed. */
+
+static void
+remove_dbx_link_breakpoint (void)
+{
+ if (dbx_link_bpt_addr == 0)
+ return;
+
+ if (deprecated_remove_raw_breakpoint (target_gdbarch, dbx_link_bpt) != 0)
+ warning (_("Unable to remove __dbx_link breakpoint."));
+
+ dbx_link_bpt_addr = 0;
+ dbx_link_bpt = NULL;
+}
+
+#ifdef SYS_syssgi
+/* Return the address of the __dbx_link() function in the file
+ refernced by ABFD by scanning its symbol table. Return 0 if
+ the symbol was not found. */
+
+static CORE_ADDR
+dbx_link_addr (bfd *abfd)
+{
+ long storage_needed;
+ asymbol **symbol_table;
+ long number_of_symbols;
+ long i;
+
+ storage_needed = bfd_get_symtab_upper_bound (abfd);
+ if (storage_needed <= 0)
+ return 0;
+
+ symbol_table = (asymbol **) xmalloc (storage_needed);
+ make_cleanup (xfree, symbol_table);
+
+ number_of_symbols = bfd_canonicalize_symtab (abfd, symbol_table);
+
+ for (i = 0; i < number_of_symbols; i++)
+ {
+ asymbol *sym = symbol_table[i];
+
+ if ((sym->flags & BSF_GLOBAL)
+ && sym->name != NULL && strcmp (sym->name, "__dbx_link") == 0)
+ return (sym->value + sym->section->vma);
+ }
+
+ /* Symbol not found, return NULL. */
+ return 0;
+}
+
+/* Search the symbol table of the file referenced by FD for a symbol
+ named __dbx_link(). If found, then insert a breakpoint at this location,
+ and return nonzero. Return zero otherwise. */
+
+static int
+insert_dbx_link_bpt_in_file (int fd, CORE_ADDR ignored)
+{
+ bfd *abfd;
+ long storage_needed;
+ CORE_ADDR sym_addr;
+
+ abfd = bfd_fdopenr ("unamed", 0, fd);
+ if (abfd == NULL)
+ {
+ warning (_("Failed to create a bfd: %s."), bfd_errmsg (bfd_get_error ()));
+ return 0;
+ }
+
+ if (!bfd_check_format (abfd, bfd_object))
+ {
+ /* Not the correct format, so we can not possibly find the dbx_link
+ symbol in it. */
+ bfd_close (abfd);
+ return 0;
+ }
+
+ sym_addr = dbx_link_addr (abfd);
+ if (sym_addr != 0)
+ {
+ /* Insert the breakpoint. */
+ dbx_link_bpt_addr = sym_addr;
+ dbx_link_bpt = deprecated_insert_raw_breakpoint (target_gdbarch, NULL,
+ sym_addr);
+ if (dbx_link_bpt == NULL)
+ {
+ warning (_("Failed to insert dbx_link breakpoint."));
+ bfd_close (abfd);
+ return 0;
+ }
+ bfd_close (abfd);
+ return 1;
+ }
+
+ bfd_close (abfd);
+ return 0;
+}
+
+/* Calls the supplied callback function once for each mapped address
+ space in the process. The callback function receives an open
+ file descriptor for the file corresponding to that mapped
+ address space (if there is one), and the base address of the
+ mapped space. Quit when the callback function returns a
+ nonzero value, or at teh end of the mappings.
+
+ Returns: the first non-zero return value of the callback function,
+ or zero. */
+
+static int
+solib_mappings_callback (struct prmap *map, int (*func) (int, CORE_ADDR),
+ void *data)
+{
+ procinfo *pi = data;
+ int fd;
+
+#ifdef NEW_PROC_API
+ char name[MAX_PROC_NAME_SIZE + sizeof (map->pr_mapname)];
+
+ if (map->pr_vaddr == 0 && map->pr_size == 0)
+ return -1; /* sanity */
+
+ if (map->pr_mapname[0] == 0)
+ {
+ fd = -1; /* no map file */
+ }
+ else
+ {
+ sprintf (name, "/proc/%d/object/%s", pi->pid, map->pr_mapname);
+ /* Note: caller's responsibility to close this fd! */
+ fd = open_with_retry (name, O_RDONLY);
+ /* Note: we don't test the above call for failure;
+ we just pass the FD on as given. Sometimes there is
+ no file, so the open may return failure, but that's
+ not a problem. */
+ }
+#else
+ fd = ioctl (pi->ctl_fd, PIOCOPENM, &map->pr_vaddr);
+ /* Note: we don't test the above call for failure;
+ we just pass the FD on as given. Sometimes there is
+ no file, so the ioctl may return failure, but that's
+ not a problem. */
+#endif
+ return (*func) (fd, (CORE_ADDR) map->pr_vaddr);
+}
+
+/* If the given memory region MAP contains a symbol named __dbx_link,
+ insert a breakpoint at this location and return nonzero. Return
+ zero otherwise. */
+
+static int
+insert_dbx_link_bpt_in_region (struct prmap *map,
+ iterate_over_mappings_cb_ftype *child_func,
+ void *data)
+{
+ procinfo *pi = (procinfo *) data;
+
+ /* We know the symbol we're looking for is in a text region, so
+ only look for it if the region is a text one. */
+ if (map->pr_mflags & MA_EXEC)
+ return solib_mappings_callback (map, insert_dbx_link_bpt_in_file, pi);
+
+ return 0;
+}
+
+/* Search all memory regions for a symbol named __dbx_link. If found,
+ insert a breakpoint at its location, and return nonzero. Return zero
+ otherwise. */
+
+static int
+insert_dbx_link_breakpoint (procinfo *pi)
+{
+ return iterate_over_mappings (pi, NULL, pi, insert_dbx_link_bpt_in_region);
+}
+#endif
+
projects / deliverable / binutils-gdb.git / blobdiff