gdb/dicos-tdep.c

   1 /* Target-dependent, architecture-independent code for DICOS, for GDB.
   2
   3    Copyright (C) 2009 Free Software Foundation, Inc.
   4
   5    This file is part of GDB.
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 #include "defs.h"
  21 #include "osabi.h"
  22 #include "gdb_string.h"
  23 #include "solib.h"
  24 #include "solib-target.h"
  25 #include "inferior.h"
  26 #include "dicos-tdep.h"
  27
  28 void
  29 dicos_init_abi (struct gdbarch *gdbarch)
  30 {
  31   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  32
  33   set_solib_ops (gdbarch, &solib_target_so_ops);
  34
  35   /* Every process, although has its own address space, sees the same
  36      list of shared libraries.  */
  37   set_gdbarch_has_global_solist (gdbarch, 1);
  38
  39   /* There's no (standard definition of) entry point or a guaranteed
  40      text location with a symbol where to place the call dummy, so we
  41      put it on the stack.  */
  42   set_gdbarch_call_dummy_location (gdbarch, ON_STACK);
  43
  44   /* DICOS rewinds the PC itself.  */
  45   set_gdbarch_decr_pc_after_break (gdbarch, 0);
  46 }
  47
  48 /* Return true if ABFD is a dicos load module.  HEADER_SIZE is the
  49    expected size of the "header" section in bytes.  */
  50
  51 int
  52 dicos_load_module_p (bfd *abfd, int header_size)
  53 {
  54   long storage_needed;
  55   int ret = 0;
  56   asymbol **symbol_table = NULL;
  57   const char *symname = "Dicos_loadModuleInfo";
  58   asection *section;
  59
  60   /* DICOS files don't have a .note.ABI-tag marker or something
  61      similar.  We do know there's always a "header" section of
  62      HEADER_SIZE bytes (size depends on architecture), and there's
  63      always a "Dicos_loadModuleInfo" symbol defined.  Look for the
  64      section first, as that should be cheaper.  */
  65
  66   section = bfd_get_section_by_name (abfd, "header");
  67   if (!section)
  68     return 0;
  69
  70   if (bfd_section_size (abfd, section) != header_size)
  71     return 0;
  72
  73   /* Dicos LMs always have a "Dicos_loadModuleInfo" symbol
  74      defined.  Look for it.  */
  75
  76   storage_needed = bfd_get_symtab_upper_bound (abfd);
  77   if (storage_needed < 0)
  78     {
  79       warning (_("Can't read elf symbols from %s: %s"), bfd_get_filename (abfd),
  80                bfd_errmsg (bfd_get_error ()));
  81       return 0;
  82     }
  83
  84   if (storage_needed > 0)
  85     {
  86       long i, symcount;
  87
  88       symbol_table = xmalloc (storage_needed);
  89       symcount = bfd_canonicalize_symtab (abfd, symbol_table);
  90
  91       if (symcount < 0)
  92         warning (_("Can't read elf symbols from %s: %s"),
  93                  bfd_get_filename (abfd),
  94                  bfd_errmsg (bfd_get_error ()));
  95       else
  96         {
  97           for (i = 0; i < symcount; i++)
  98             {
  99               asymbol *sym = symbol_table[i];
 100               if (sym->name != NULL
 101                   && symname[0] == sym->name[0]
 102                   && strcmp (symname + 1, sym->name + 1) == 0)
 103                 {
 104                   ret = 1;
 105                   break;
 106                 }
 107             }
 108         }
 109     }
 110
 111   xfree (symbol_table);
 112   return ret;
 113 }