Thu Apr 3 15:10:30 1997 Michael Snyder <msnyder@cleaver.cygnus.com>

Except for the two m32r modules, this checkin is for
	overlay support.

        * blockframe.c: blockvector_for_pc_sect(), block_for_pc_sect(),
        find_pc_sect_function(), find_pc_sect_partial_function(): new
        functions for debugging overlays; pc without section is ambiguous.
        * breakpoint.[ch]: add section pointer to breakpoint struct;
        add section argument to check_duplicates(); check section as well
        as pc in [breakpoint_here_p(), breakpoint_inserted_here_p(),
        breakpoint_thread_match(), bpstat_stop_status()];
        add section argument to describe_other_breakpoints();
        use INIT_SAL() macro to zero-out new sal structures;
        make resolve_sal_pc() fix up the sal's section as well as its pc;
        match on section + pc in clear_command() and delete_breakpoint();
        account for overlay sections in insert_breakpoints(),
        remove_breakpoint() and breakpoint_re_set_one();
        all this to support overlays where a PC is not unique.
        * exec.c: change xfer_memory() to handle overlay sections.
        * findvar.c: change read_var_value() to handle overlay sections.
        * frame.h: declaration for block_for_pc_sect() [blockframe.c].
        * infcmd.c: jump_command() warns against jumping into an overlay
        that's not in memory.  Also use INIT_SAL() to initialize sals.
        * infrun.c: wait_for_inferior() sets a flag to invalidate cached
        overlay state information; Also use INIT_SAL() to init sals.
        * m32r-rom.c: modify load routines to use LMA instead of VMA.
        * m32r-stub.c: mask exit value down to 8 bits; screen out any
        memory read/writes in the range 600000 to a00000, and ff680000
        to ff800000 (hangs because nothing is mapped there); fix strcpy().
        * maint.c: maintenance command "translate-address" supports overlays.
        * minsyms.c: lookup_minimal_symbol_by_pc_sect() supports overlays.
        * objfiles.[ch]: add ovly_mapped field to the obj_section struct;
        this constitutes gdb's internal overlay mapping table.  Add macro
        ALL_OBJSECTIONS() to loop thru the obj_structs and look at overlays.
        Add function find_pc_sect_section().
        * printcmd.c: modify print_address_symbolic() with overlay smarts;
        modify address_info() with overlay smarts; add function sym_info()
        to support the INFO SYMBOL command (translate address to symbol(s));
        modify disassemble_command() to work on unmapped overlays.
        * source.c: use INIT_SAL() to initialize sals.
        * symfile.[ch]: change generic_load() to use section's LMA address
        instead of VMA address, for overlay sections.
        Add numerous functions for finding a PC's section / overlay,
        translating between VMA and LMA address ranges, determining if an
        overlay section is mapped, etc.  Add several user commands for
        overlay debugging.  Add support for a "generic" form of automatically
        reading overlay mapping info from the inferior (based on the default
        (simple) overlay manager which Cygnus provides as an example).
        * symtab.[ch]: add functions find_pc_sect_symtab(),
        find_pc_sect_psymtab(), find_pc_sect_psymbol(), find_pc_sect_line()
        for lookup; modify lookup_symbol and decode_line_1() to use them;
        modify find_function_start_sal() to account for overlay sections;
        add macro INIT_SAL() for initializing struct symtab_and_line.
        * target.c: fix a comment in the declaration of target_ops.

gdb/maint.c

@@ -294,7 +294,11 @@ maintenance_translate_address (arg, from_tty)
   CORE_ADDR address;
   asection *sect;
   char *p;
-  struct symbol *sym;
+  struct minimal_symbol *sym;
+  struct objfile *objfile;
+
+  if (arg == NULL || *arg == 0)
+    error ("requires argument (address or section + address)");
 
   sect = NULL;
   p = arg;
@@ -308,17 +312,31 @@ maintenance_translate_address (arg, from_tty)
       *p++ = '\000';
       while (isspace (*p)) p++;	/* Skip whitespace */
 
-      sect = bfd_get_section_by_name (exec_bfd, arg);
+      ALL_OBJFILES (objfile)
+	if (sect = bfd_get_section_by_name (objfile->obfd, arg))
+	  break;
+
       if (!sect)
 	error ("Unknown section %s.", arg);
     }
 
   address = parse_and_eval_address (p);
 
-  return;
-/*  sym = find_pc_function_section (address, sect);*/
+  if (sect)
+    sym = lookup_minimal_symbol_by_pc_section (address, sect);
+  else
+    sym = lookup_minimal_symbol_by_pc (address);
 
-  printf_unfiltered ("%s+%u\n", SYMBOL_SOURCE_NAME (sym), address - SYMBOL_VALUE_ADDRESS (sym));
+  if (sym)
+    printf_filtered ("%s+%u\n", 
+		     SYMBOL_SOURCE_NAME (sym), 
+		     address - SYMBOL_VALUE_ADDRESS (sym));
+  else if (sect)
+    printf_filtered ("no symbol at %s:0x%08x\n", sect->name, address);
+  else
+    printf_filtered ("no symbol at 0x%08x\n", address);
+
+  return;
 }
 
 #endif	/* MAINTENANCE_CMDS */