gdb/armnbsd-tdep.c

   1 /* Target-dependent code for NetBSD/arm.
   2
   3    Copyright (C) 2002-2016 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 "arch/arm.h"
  24 #include "arm-tdep.h"
  25 #include "solib-svr4.h"
  26
  27 /* Description of the longjmp buffer.  */
  28 #define ARM_NBSD_JB_PC 24
  29 #define ARM_NBSD_JB_ELEMENT_SIZE INT_REGISTER_SIZE
  30
  31 /* For compatibility with previous implemenations of GDB on arm/NetBSD,
  32    override the default little-endian breakpoint.  */
  33 static const gdb_byte arm_nbsd_arm_le_breakpoint[] = {0x11, 0x00, 0x00, 0xe6};
  34 static const gdb_byte arm_nbsd_arm_be_breakpoint[] = {0xe6, 0x00, 0x00, 0x11};
  35 static const gdb_byte arm_nbsd_thumb_le_breakpoint[] = {0xfe, 0xde};
  36 static const gdb_byte arm_nbsd_thumb_be_breakpoint[] = {0xde, 0xfe};
  37
  38 static void
  39 arm_netbsd_init_abi_common (struct gdbarch_info info,
  40                             struct gdbarch *gdbarch)
  41 {
  42   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  43
  44   tdep->lowest_pc = 0x8000;
  45   switch (info.byte_order)
  46     {
  47     case BFD_ENDIAN_LITTLE:
  48       tdep->arm_breakpoint = arm_nbsd_arm_le_breakpoint;
  49       tdep->thumb_breakpoint = arm_nbsd_thumb_le_breakpoint;
  50       tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_le_breakpoint);
  51       tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_le_breakpoint);
  52       break;
  53
  54     case BFD_ENDIAN_BIG:
  55       tdep->arm_breakpoint = arm_nbsd_arm_be_breakpoint;
  56       tdep->thumb_breakpoint = arm_nbsd_thumb_be_breakpoint;
  57       tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_be_breakpoint);
  58       tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_be_breakpoint);
  59       break;
  60
  61     default:
  62       internal_error (__FILE__, __LINE__,
  63                       _("arm_gdbarch_init: bad byte order for float format"));
  64     }
  65
  66   tdep->jb_pc = ARM_NBSD_JB_PC;
  67   tdep->jb_elt_size = ARM_NBSD_JB_ELEMENT_SIZE;
  68
  69   /* Single stepping.  */
  70   set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
  71 }
  72
  73 static void
  74 arm_netbsd_aout_init_abi (struct gdbarch_info info,
  75                           struct gdbarch *gdbarch)
  76 {
  77   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  78
  79   arm_netbsd_init_abi_common (info, gdbarch);
  80   if (tdep->fp_model == ARM_FLOAT_AUTO)
  81     tdep->fp_model = ARM_FLOAT_SOFT_FPA;
  82 }
  83
  84 static void
  85 arm_netbsd_elf_init_abi (struct gdbarch_info info,
  86                          struct gdbarch *gdbarch)
  87 {
  88   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  89
  90   arm_netbsd_init_abi_common (info, gdbarch);
  91   if (tdep->fp_model == ARM_FLOAT_AUTO)
  92     tdep->fp_model = ARM_FLOAT_SOFT_VFP;
  93
  94   /* NetBSD ELF uses SVR4-style shared libraries.  */
  95   set_solib_svr4_fetch_link_map_offsets
  96     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
  97 }
  98
  99 static enum gdb_osabi
 100 arm_netbsd_aout_osabi_sniffer (bfd *abfd)
 101 {
 102   if (strcmp (bfd_get_target (abfd), "a.out-arm-netbsd") == 0)
 103     return GDB_OSABI_NETBSD_AOUT;
 104
 105   return GDB_OSABI_UNKNOWN;
 106 }
 107
 108 /* Provide a prototype to silence -Wmissing-prototypes.  */
 109 extern initialize_file_ftype _initialize_arm_netbsd_tdep;
 110
 111 void
 112 _initialize_arm_netbsd_tdep (void)
 113 {
 114   gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_aout_flavour,
 115                                   arm_netbsd_aout_osabi_sniffer);
 116
 117   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_AOUT,
 118                           arm_netbsd_aout_init_abi);
 119   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_ELF,
 120                           arm_netbsd_elf_init_abi);
 121 }