gdb/armnbsd-tdep.c

   1 /* Target-specific functions for ARM running under NetBSD.
   2
   3    Copyright 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., 59 Temple Place - Suite 330,
  20    Boston, MA 02111-1307, 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 int
  43 arm_netbsd_aout_in_solib_call_trampoline (CORE_ADDR pc, char *name)
  44 {
  45   if (strcmp (name, "_PROCEDURE_LINKAGE_TABLE_") == 0)
  46     return 1;
  47
  48   return 0;
  49 }
  50
  51 static void
  52 arm_netbsd_init_abi_common (struct gdbarch_info info,
  53                             struct gdbarch *gdbarch)
  54 {
  55   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
  56
  57   tdep->lowest_pc = 0x8000;
  58   switch (info.byte_order)
  59     {
  60     case BFD_ENDIAN_LITTLE:
  61       tdep->arm_breakpoint = arm_nbsd_arm_le_breakpoint;
  62       tdep->thumb_breakpoint = arm_nbsd_thumb_le_breakpoint;
  63       tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_le_breakpoint);
  64       tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_le_breakpoint);
  65       break;
  66
  67     case BFD_ENDIAN_BIG:
  68       tdep->arm_breakpoint = arm_nbsd_arm_be_breakpoint;
  69       tdep->thumb_breakpoint = arm_nbsd_thumb_be_breakpoint;
  70       tdep->arm_breakpoint_size = sizeof (arm_nbsd_arm_be_breakpoint);
  71       tdep->thumb_breakpoint_size = sizeof (arm_nbsd_thumb_be_breakpoint);
  72       break;
  73
  74     default:
  75       internal_error (__FILE__, __LINE__,
  76                       "arm_gdbarch_init: bad byte order for float format");
  77     }
  78
  79   tdep->jb_pc = ARM_NBSD_JB_PC;
  80   tdep->jb_elt_size = ARM_NBSD_JB_ELEMENT_SIZE;
  81 }
  82
  83 static void
  84 arm_netbsd_aout_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
  91   set_gdbarch_in_solib_call_trampoline
  92     (gdbarch, arm_netbsd_aout_in_solib_call_trampoline);
  93   tdep->fp_model = ARM_FLOAT_SOFT_FPA;
  94 }
  95
  96 static void
  97 arm_netbsd_elf_init_abi (struct gdbarch_info info,
  98                          struct gdbarch *gdbarch)
  99 {
 100   struct gdbarch_tdep *tdep = gdbarch_tdep (gdbarch);
 101
 102   arm_netbsd_init_abi_common (info, gdbarch);
 103
 104   set_solib_svr4_fetch_link_map_offsets (gdbarch,
 105                                 nbsd_ilp32_solib_svr4_fetch_link_map_offsets);
 106
 107   tdep->fp_model = ARM_FLOAT_SOFT_VFP;
 108 }
 109
 110 static enum gdb_osabi
 111 arm_netbsd_aout_osabi_sniffer (bfd *abfd)
 112 {
 113   if (strcmp (bfd_get_target (abfd), "a.out-arm-netbsd") == 0)
 114     return GDB_OSABI_NETBSD_AOUT;
 115
 116   return GDB_OSABI_UNKNOWN;
 117 }
 118
 119 void
 120 _initialize_arm_netbsd_tdep (void)
 121 {
 122   gdbarch_register_osabi_sniffer (bfd_arch_arm, bfd_target_aout_flavour,
 123                                   arm_netbsd_aout_osabi_sniffer);
 124
 125   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_AOUT,
 126                           arm_netbsd_aout_init_abi);
 127   gdbarch_register_osabi (bfd_arch_arm, 0, GDB_OSABI_NETBSD_ELF,
 128                           arm_netbsd_elf_init_abi);
 129 }