gdb/i386-go32-tdep.c

   1 /* Target-dependent code for DJGPP/i386.
   2
   3    Copyright (C) 1988-2019 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 "i386-tdep.h"
  22 #include "common/x86-xstate.h"
  23 #include "target-descriptions.h"
  24 #include "osabi.h"
  25
  26 static void
  27 i386_go32_init_abi (struct gdbarch_info info, struct gdbarch *gdbarch)
  28 {
  29   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  30
  31   /* DJGPP doesn't have any special frames for signal handlers.  */
  32   tdep->sigtramp_p = NULL;
  33
  34   tdep->jb_pc_offset = 36;
  35
  36   /* DJGPP does not support the SSE registers.  */
  37   if (!tdesc_has_registers (info.target_desc))
  38     tdep->tdesc = i386_target_description (X86_XSTATE_X87_MASK, false);
  39
  40   /* Native compiler is GCC, which uses the SVR4 register numbering
  41      even in COFF and STABS.  See the comment in i386_gdbarch_init,
  42      before the calls to set_gdbarch_stab_reg_to_regnum and
  43      set_gdbarch_sdb_reg_to_regnum.  */
  44   set_gdbarch_stab_reg_to_regnum (gdbarch, i386_svr4_reg_to_regnum);
  45   set_gdbarch_sdb_reg_to_regnum (gdbarch, i386_svr4_reg_to_regnum);
  46
  47   set_gdbarch_has_dos_based_file_system (gdbarch, 1);
  48
  49   set_gdbarch_wchar_bit (gdbarch, 16);
  50   set_gdbarch_wchar_signed (gdbarch, 0);
  51 }
  52 \f
  53
  54 static enum gdb_osabi
  55 i386_coff_osabi_sniffer (bfd *abfd)
  56 {
  57   if (strcmp (bfd_get_target (abfd), "coff-go32-exe") == 0
  58       || strcmp (bfd_get_target (abfd), "coff-go32") == 0)
  59     return GDB_OSABI_GO32;
  60
  61   return GDB_OSABI_UNKNOWN;
  62 }
  63 \f
  64
  65 void
  66 _initialize_i386_go32_tdep ()
  67 {
  68   gdbarch_register_osabi_sniffer (bfd_arch_i386, bfd_target_coff_flavour,
  69                                   i386_coff_osabi_sniffer);
  70
  71   gdbarch_register_osabi (bfd_arch_i386, 0, GDB_OSABI_GO32,
  72                           i386_go32_init_abi);
  73 }