gdb/armnbsd-tdep.c

   1 /* Target-dependent code for NetBSD/arm.
   2
   3    Copyright (C) 2002, 2003, 2004, 2006, 2007, 2008
   4    Free Software Foundation, Inc.
   5
   6    This file is part of GDB.
   7
   8    This program is free software; you can redistribute it and/or modify
   9    it under the terms of the GNU General Public License as published by
  10    the Free Software Foundation; either version 3 of the License, or
  11    (at your option) any later version.
  12
  13    This program is distributed in the hope that it will be useful,
  14    but WITHOUT ANY WARRANTY; without even the implied warranty of
  15    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16    GNU General Public License for more details.
  17
  18    You should have received a copy of the GNU General Public License
  19    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  20
  21 #include "defs.h"
  22 #include "osabi.h"
  23
  24 #include "gdb_string.h"
  25
  26 #include "arm-tdep.h"
  27 #include "solib-svr4.h"
  28
  29 /* Description of the longjmp buffer.  */
  30 #define ARM_NBSD_JB_PC 24
  31 #define ARM_NBSD_JB_ELEMENT_SIZE INT_REGISTER_SIZE
  32
  33 /* For compatibility with previous implemenations of GDB on arm/NetBSD,
  34    override the default little-endian breakpoint.  */
  35 static const char arm_nbsd_arm_le_breakpoint[] = {0x11, 0x00, 0x00, 0xe6};
  36 static const char arm_nbsd_arm_be_breakpoint[] = {0xe6, 0x00, 0x00, 0x11};
  37 static const char arm_nbsd_thumb_le_breakpoint[] = {0xfe, 0xde};
  38 static const char arm_nbsd_thumb_be_breakpoint[] = {0xde, 0xfe};
  39
  40 static void
  41 arm_netbsd_init_abi_common (struct gdbarch_info info,
  42                             struct gdbarch *gdbarch)
  43 {
  44   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  45
  46   tdep->lowest_pc = 0x8000;
  47   switch (info.byte_order)
  48     {
  49     case BFD_ENDIAN_LITTLE:
  50       tdep->arm_breakpoint = arm_nbsd_arm_le_breakpoint;
  51       tdep->thumb_breakpoint = arm_nbsd_thumb_le_breakpoint;
  52       tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_le_breakpoint);
  53       tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_le_breakpoint);
  54       break;
  55
  56     case BFD_ENDIAN_BIG:
  57       tdep->arm_breakpoint = arm_nbsd_arm_be_breakpoint;
  58       tdep->thumb_breakpoint = arm_nbsd_thumb_be_breakpoint;
  59       tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_be_breakpoint);
  60       tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_be_breakpoint);
  61       break;
  62
  63     default:
  64       internal_error (__FILE__, __LINE__,
  65                       _("arm_gdbarch_init: bad byte order for float format"));
  66     }
  67
  68   tdep->jb_pc = ARM_NBSD_JB_PC;
  69   tdep->jb_elt_size = ARM_NBSD_JB_ELEMENT_SIZE;
  70
  71   /* Single stepping.  */
  72   set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
  73 }
  74
  75 static void
  76 arm_netbsd_aout_init_abi (struct gdbarch_info info,
  77                           struct gdbarch *gdbarch)
  78 {
  79   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  80
  81   arm_netbsd_init_abi_common (info, gdbarch);
  82   if (tdep->fp_model == ARM_FLOAT_AUTO)
  83     tdep->fp_model = ARM_FLOAT_SOFT_FPA;
  84 }
  85
  86 static void
  87 arm_netbsd_elf_init_abi (struct gdbarch_info info,
  88                          struct gdbarch *gdbarch)
  89 {
  90   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  91
  92   arm_netbsd_init_abi_common (info, gdbarch);
  93   if (tdep->fp_model == ARM_FLOAT_AUTO)
  94     tdep->fp_model = ARM_FLOAT_SOFT_VFP;
  95
  96   /* NetBSD ELF uses SVR4-style shared libraries.  */
  97   set_solib_svr4_fetch_link_map_offsets
  98     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
  99 }
 100
 101 static enum gdb_osabi
 102 arm_netbsd_aout_osabi_sniffer (bfd *abfd)
 103 {
 104   if (strcmp (bfd_get_target (abfd), "a.out-arm-netbsd") == 0)
 105     return GDB_OSABI_NETBSD_AOUT;
 106
 107   return GDB_OSABI_UNKNOWN;
 108 }
 109
 110 void
 111 _initialize_arm_netbsd_tdep (void)
 112 {
 113   gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_aout_flavour,
 114                                   arm_netbsd_aout_osabi_sniffer);
 115
 116   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_AOUT,
 117                           arm_netbsd_aout_init_abi);
 118   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_ELF,
 119                           arm_netbsd_elf_init_abi);
 120 }