gdb/i386-dicos-tdep.c

   1 /* Target-dependent code for DICOS running on i386's, for GDB.
   2
   3    Copyright (C) 2008, 2009, 2010 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 "dicos-tdep.h"
  24
  25 static CORE_ADDR
  26 i386_dicos_push_dummy_code (struct gdbarch *gdbarch,
  27                             CORE_ADDR sp, CORE_ADDR funaddr,
  28                             struct value **args, int nargs,
  29                             struct type *value_type,
  30                             CORE_ADDR *real_pc, CORE_ADDR *bp_addr,
  31                             struct regcache *regcache)
  32 {
  33   int bplen;
  34   CORE_ADDR bppc = sp;
  35
  36   gdbarch_breakpoint_from_pc (gdbarch, &bppc, &bplen);
  37   *bp_addr = sp - bplen;
  38   *real_pc = funaddr;
  39
  40   return *bp_addr;
  41 }
  42
  43 static void
  44 i386_dicos_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  45 {
  46   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  47
  48   dicos_init_abi (gdbarch);
  49
  50   set_gdbarch_push_dummy_code (gdbarch, i386_dicos_push_dummy_code);
  51 }
  52
  53 static enum gdb_osabi
  54 i386_dicos_osabi_sniffer (bfd *abfd)
  55 {
  56   char *target_name = bfd_get_target (abfd);
  57
  58   /* On x86-DICOS, the Load Module's "header" section is 36 bytes.  */
  59   if (strcmp (target_name, "elf32-i386") == 0
  60       && dicos_load_module_p (abfd, 36))
  61     return GDB_OSABI_DICOS;
  62
  63   return GDB_OSABI_UNKNOWN;
  64 }
  65
  66 /* Provide a prototype to silence -Wmissing-prototypes.  */
  67 void _initialize_i386_dicos_tdep (void);
  68
  69 void
  70 _initialize_i386_dicos_tdep (void)
  71 {
  72   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_elf_flavour,
  73                                   i386_dicos_osabi_sniffer);
  74
  75   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_DICOS,
  76                           i386_dicos_init_abi);
  77 }