gdb/armnbsd-tdep.c

   1 /* Target-dependent code for NetBSD/arm.
   2
   3    Copyright (C) 2002-2015 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
  23 #include "arm-tdep.h"
  24 #include "solib-svr4.h"
  25
  26 /* Description of the longjmp buffer.  */
  27 #define ARM_NBSD_JB_PC 24
  28 #define ARM_NBSD_JB_ELEMENT_SIZE INT_REGISTER_SIZE
  29
  30 /* For compatibility with previous implemenations of GDB on arm/NetBSD,
  31    override the default little-endian breakpoint.  */
  32 static const gdb_byte arm_nbsd_arm_le_breakpoint[] = {0x11, 0x00, 0x00, 0xe6};
  33 static const gdb_byte arm_nbsd_arm_be_breakpoint[] = {0xe6, 0x00, 0x00, 0x11};
  34 static const gdb_byte arm_nbsd_thumb_le_breakpoint[] = {0xfe, 0xde};
  35 static const gdb_byte arm_nbsd_thumb_be_breakpoint[] = {0xde, 0xfe};
  36
  37 static void
  38 arm_netbsd_init_abi_common (struct gdbarch_info info,
  39                             struct gdbarch *gdbarch)
  40 {
  41   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  42
  43   tdep->lowest_pc = 0x8000;
  44   switch (info.byte_order)
  45     {
  46     case BFD_ENDIAN_LITTLE:
  47       tdep->arm_breakpoint = arm_nbsd_arm_le_breakpoint;
  48       tdep->thumb_breakpoint = arm_nbsd_thumb_le_breakpoint;
  49       tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_le_breakpoint);
  50       tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_le_breakpoint);
  51       break;
  52
  53     case BFD_ENDIAN_BIG:
  54       tdep->arm_breakpoint = arm_nbsd_arm_be_breakpoint;
  55       tdep->thumb_breakpoint = arm_nbsd_thumb_be_breakpoint;
  56       tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_be_breakpoint);
  57       tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_be_breakpoint);
  58       break;
  59
  60     default:
  61       internal_error (__FILE__, __LINE__,
  62                       _("arm_gdbarch_init: bad byte order for float format"));
  63     }
  64
  65   tdep->jb_pc = ARM_NBSD_JB_PC;
  66   tdep->jb_elt_size = ARM_NBSD_JB_ELEMENT_SIZE;
  67
  68   /* Single stepping.  */
  69   set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
  70 }
  71
  72 static void
  73 arm_netbsd_aout_init_abi (struct gdbarch_info info,
  74                           struct gdbarch *gdbarch)
  75 {
  76   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  77
  78   arm_netbsd_init_abi_common (info, gdbarch);
  79   if (tdep->fp_model == ARM_FLOAT_AUTO)
  80     tdep->fp_model = ARM_FLOAT_SOFT_FPA;
  81 }
  82
  83 static void
  84 arm_netbsd_elf_init_abi (struct gdbarch_info info,
  85                          struct gdbarch *gdbarch)
  86 {
  87   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  88
  89   arm_netbsd_init_abi_common (info, gdbarch);
  90   if (tdep->fp_model == ARM_FLOAT_AUTO)
  91     tdep->fp_model = ARM_FLOAT_SOFT_VFP;
  92
  93   /* NetBSD ELF uses SVR4-style shared libraries.  */
  94   set_solib_svr4_fetch_link_map_offsets
  95     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
  96 }
  97
  98 static enum gdb_osabi
  99 arm_netbsd_aout_osabi_sniffer (bfd *abfd)
 100 {
 101   if (strcmp (bfd_get_target (abfd), "a.out-arm-netbsd") == 0)
 102     return GDB_OSABI_NETBSD_AOUT;
 103
 104   return GDB_OSABI_UNKNOWN;
 105 }
 106
 107 /* Provide a prototype to silence -Wmissing-prototypes.  */
 108 extern initialize_file_ftype _initialize_arm_netbsd_tdep;
 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 }