gdb/armnbsd-tdep.c

   1 /* Target-specific functions for ARM running under NetBSD.
   2
   3    Copyright (C) 2002, 2003, 2004 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 2 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, write to the Free Software
  19    Foundation, Inc., 51 Franklin Street, Fifth Floor,
  20    Boston, MA 02110-1301, USA.  */
  21
  22 #include "defs.h"
  23 #include "osabi.h"
  24
  25 #include "gdb_string.h"
  26
  27 #include "arm-tdep.h"
  28 #include "nbsd-tdep.h"
  29 #include "solib-svr4.h"
  30
  31 /* Description of the longjmp buffer.  */
  32 #define ARM_NBSD_JB_PC 24
  33 #define ARM_NBSD_JB_ELEMENT_SIZE INT_REGISTER_SIZE
  34
  35 /* For compatibility with previous implemenations of GDB on arm/NetBSD,
  36    override the default little-endian breakpoint.  */
  37 static const char arm_nbsd_arm_le_breakpoint[] = {0x11, 0x00, 0x00, 0xe6};
  38 static const char arm_nbsd_arm_be_breakpoint[] = {0xe6, 0x00, 0x00, 0x11};
  39 static const char arm_nbsd_thumb_le_breakpoint[] = {0xfe, 0xde};
  40 static const char arm_nbsd_thumb_be_breakpoint[] = {0xde, 0xfe};
  41
  42 static void
  43 arm_netbsd_init_abi_common (struct gdbarch_info info,
  44                             struct gdbarch *gdbarch)
  45 {
  46   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  47
  48   tdep->lowest_pc = 0x8000;
  49   switch (info.byte_order)
  50     {
  51     case BFD_ENDIAN_LITTLE:
  52       tdep->arm_breakpoint = arm_nbsd_arm_le_breakpoint;
  53       tdep->thumb_breakpoint = arm_nbsd_thumb_le_breakpoint;
  54       tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_le_breakpoint);
  55       tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_le_breakpoint);
  56       break;
  57
  58     case BFD_ENDIAN_BIG:
  59       tdep->arm_breakpoint = arm_nbsd_arm_be_breakpoint;
  60       tdep->thumb_breakpoint = arm_nbsd_thumb_be_breakpoint;
  61       tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_be_breakpoint);
  62       tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_be_breakpoint);
  63       break;
  64
  65     default:
  66       internal_error (__FILE__, __LINE__,
  67                       _("arm_gdbarch_init: bad byte order for float format"));
  68     }
  69
  70   tdep->jb_pc = ARM_NBSD_JB_PC;
  71   tdep->jb_elt_size = ARM_NBSD_JB_ELEMENT_SIZE;
  72 }
  73
  74 static void
  75 arm_netbsd_aout_init_abi (struct gdbarch_info info,
  76                           struct gdbarch *gdbarch)
  77 {
  78   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  79
  80   arm_netbsd_init_abi_common (info, gdbarch);
  81   if (tdep->fp_model == ARM_FLOAT_AUTO)
  82     tdep->fp_model = ARM_FLOAT_SOFT_FPA;
  83 }
  84
  85 static void
  86 arm_netbsd_elf_init_abi (struct gdbarch_info info,
  87                          struct gdbarch *gdbarch)
  88 {
  89   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  90
  91   arm_netbsd_init_abi_common (info, gdbarch);
  92
  93   set_solib_svr4_fetch_link_map_offsets (gdbarch,
  94                                 nbsd_ilp32_solib_svr4_fetch_link_map_offsets);
  95
  96   if (tdep->fp_model == ARM_FLOAT_AUTO)
  97     tdep->fp_model = ARM_FLOAT_SOFT_VFP;
  98 }
  99
 100 static enum gdb_osabi
 101 arm_netbsd_aout_osabi_sniffer (bfd *abfd)
 102 {
 103   if (strcmp (bfd_get_target (abfd), "a.out-arm-netbsd") == 0)
 104     return GDB_OSABI_NETBSD_AOUT;
 105
 106   return GDB_OSABI_UNKNOWN;
 107 }
 108
 109 void
 110 _initialize_arm_netbsd_tdep (void)
 111 {
 112   gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_aout_flavour,
 113                                   arm_netbsd_aout_osabi_sniffer);
 114
 115   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_AOUT,
 116                           arm_netbsd_aout_init_abi);
 117   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_ELF,
 118                           arm_netbsd_elf_init_abi);
 119 }