gdb/armnbsd-tdep.c

   1 /* Target-dependent code for NetBSD/arm.
   2
   3    Copyright (C) 2002, 2003, 2004, 2006, 2007 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 "solib-svr4.h"
  29
  30 /* Description of the longjmp buffer.  */
  31 #define ARM_NBSD_JB_PC 24
  32 #define ARM_NBSD_JB_ELEMENT_SIZE INT_REGISTER_SIZE
  33
  34 /* For compatibility with previous implemenations of GDB on arm/NetBSD,
  35    override the default little-endian breakpoint.  */
  36 static const char arm_nbsd_arm_le_breakpoint[] = {0x11, 0x00, 0x00, 0xe6};
  37 static const char arm_nbsd_arm_be_breakpoint[] = {0xe6, 0x00, 0x00, 0x11};
  38 static const char arm_nbsd_thumb_le_breakpoint[] = {0xfe, 0xde};
  39 static const char arm_nbsd_thumb_be_breakpoint[] = {0xde, 0xfe};
  40
  41 static void
  42 arm_netbsd_init_abi_common (struct gdbarch_info info,
  43                             struct gdbarch *gdbarch)
  44 {
  45   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  46
  47   tdep->lowest_pc = 0x8000;
  48   switch (info.byte_order)
  49     {
  50     case BFD_ENDIAN_LITTLE:
  51       tdep->arm_breakpoint = arm_nbsd_arm_le_breakpoint;
  52       tdep->thumb_breakpoint = arm_nbsd_thumb_le_breakpoint;
  53       tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_le_breakpoint);
  54       tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_le_breakpoint);
  55       break;
  56
  57     case BFD_ENDIAN_BIG:
  58       tdep->arm_breakpoint = arm_nbsd_arm_be_breakpoint;
  59       tdep->thumb_breakpoint = arm_nbsd_thumb_be_breakpoint;
  60       tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_be_breakpoint);
  61       tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_be_breakpoint);
  62       break;
  63
  64     default:
  65       internal_error (__FILE__, __LINE__,
  66                       _("arm_gdbarch_init: bad byte order for float format"));
  67     }
  68
  69   tdep->jb_pc = ARM_NBSD_JB_PC;
  70   tdep->jb_elt_size = ARM_NBSD_JB_ELEMENT_SIZE;
  71
  72   /* Single stepping.  */
  73   set_gdbarch_software_single_step (gdbarch, arm_software_single_step);
  74 }
  75
  76 static void
  77 arm_netbsd_aout_init_abi (struct gdbarch_info info,
  78                           struct gdbarch *gdbarch)
  79 {
  80   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  81
  82   arm_netbsd_init_abi_common (info, gdbarch);
  83   if (tdep->fp_model == ARM_FLOAT_AUTO)
  84     tdep->fp_model = ARM_FLOAT_SOFT_FPA;
  85 }
  86
  87 static void
  88 arm_netbsd_elf_init_abi (struct gdbarch_info info,
  89                          struct gdbarch *gdbarch)
  90 {
  91   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  92
  93   arm_netbsd_init_abi_common (info, gdbarch);
  94   if (tdep->fp_model == ARM_FLOAT_AUTO)
  95     tdep->fp_model = ARM_FLOAT_SOFT_VFP;
  96
  97   /* NetBSD ELF uses SVR4-style shared libraries.  */
  98   set_solib_svr4_fetch_link_map_offsets
  99     (gdbarch, svr4_ilp32_fetch_link_map_offsets);
 100 }
 101
 102 static enum gdb_osabi
 103 arm_netbsd_aout_osabi_sniffer (bfd *abfd)
 104 {
 105   if (strcmp (bfd_get_target (abfd), "a.out-arm-netbsd") == 0)
 106     return GDB_OSABI_NETBSD_AOUT;
 107
 108   return GDB_OSABI_UNKNOWN;
 109 }
 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 }