gdb/rs6000-aix-tdep.c

   1 /* Native support code for PPC AIX, for GDB the GNU debugger.
   2
   3    Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
   4
   5    Free Software Foundation, Inc.
   6
   7    This file is part of GDB.
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
  21
  22 #include "defs.h"
  23 #include "gdb_string.h"
  24 #include "osabi.h"
  25 #include "regcache.h"
  26 #include "regset.h"
  27 #include "rs6000-tdep.h"
  28 #include "ppc-tdep.h"
  29
  30
  31 /* Core file support.  */
  32
  33 static struct ppc_reg_offsets rs6000_aix32_reg_offsets =
  34 {
  35   /* General-purpose registers.  */
  36   208, /* r0_offset */
  37   4,  /* gpr_size */
  38   4,  /* xr_size */
  39   24, /* pc_offset */
  40   28, /* ps_offset */
  41   32, /* cr_offset */
  42   36, /* lr_offset */
  43   40, /* ctr_offset */
  44   44, /* xer_offset */
  45   48, /* mq_offset */
  46
  47   /* Floating-point registers.  */
  48   336, /* f0_offset */
  49   56, /* fpscr_offset */
  50   4,  /* fpscr_size */
  51
  52   /* AltiVec registers.  */
  53   -1, /* vr0_offset */
  54   -1, /* vscr_offset */
  55   -1 /* vrsave_offset */
  56 };
  57
  58 static struct ppc_reg_offsets rs6000_aix64_reg_offsets =
  59 {
  60   /* General-purpose registers.  */
  61   0, /* r0_offset */
  62   8,  /* gpr_size */
  63   4,  /* xr_size */
  64   264, /* pc_offset */
  65   256, /* ps_offset */
  66   288, /* cr_offset */
  67   272, /* lr_offset */
  68   280, /* ctr_offset */
  69   292, /* xer_offset */
  70   -1, /* mq_offset */
  71
  72   /* Floating-point registers.  */
  73   312, /* f0_offset */
  74   296, /* fpscr_offset */
  75   4,  /* fpscr_size */
  76
  77   /* AltiVec registers.  */
  78   -1, /* vr0_offset */
  79   -1, /* vscr_offset */
  80   -1 /* vrsave_offset */
  81 };
  82
  83
  84 /* Supply register REGNUM in the general-purpose register set REGSET
  85    from the buffer specified by GREGS and LEN to register cache
  86    REGCACHE.  If REGNUM is -1, do this for all registers in REGSET.  */
  87
  88 static void
  89 rs6000_aix_supply_regset (const struct regset *regset,
  90                           struct regcache *regcache, int regnum,
  91                           const void *gregs, size_t len)
  92 {
  93   ppc_supply_gregset (regset, regcache, regnum, gregs, len);
  94   ppc_supply_fpregset (regset, regcache, regnum, gregs, len);
  95 }
  96
  97 /* Collect register REGNUM in the general-purpose register set
  98    REGSET. from register cache REGCACHE into the buffer specified by
  99    GREGS and LEN.  If REGNUM is -1, do this for all registers in
 100    REGSET.  */
 101
 102 static void
 103 rs6000_aix_collect_regset (const struct regset *regset,
 104                            const struct regcache *regcache, int regnum,
 105                            void *gregs, size_t len)
 106 {
 107   ppc_collect_gregset (regset, regcache, regnum, gregs, len);
 108   ppc_collect_fpregset (regset, regcache, regnum, gregs, len);
 109 }
 110
 111 /* AIX register set.  */
 112
 113 static struct regset rs6000_aix32_regset =
 114 {
 115   &rs6000_aix32_reg_offsets,
 116   rs6000_aix_supply_regset,
 117   rs6000_aix_collect_regset,
 118 };
 119
 120 static struct regset rs6000_aix64_regset =
 121 {
 122   &rs6000_aix64_reg_offsets,
 123   rs6000_aix_supply_regset,
 124   rs6000_aix_collect_regset,
 125 };
 126
 127 /* Return the appropriate register set for the core section identified
 128    by SECT_NAME and SECT_SIZE.  */
 129
 130 static const struct regset *
 131 rs6000_aix_regset_from_core_section (struct gdbarch *gdbarch,
 132                                      const char *sect_name, size_t sect_size)
 133 {
 134   if (gdbarch_tdep (gdbarch)->wordsize == 4)
 135     {
 136       if (strcmp (sect_name, ".reg") == 0 && sect_size >= 592)
 137         return &rs6000_aix32_regset;
 138     }
 139   else
 140     {
 141       if (strcmp (sect_name, ".reg") == 0 && sect_size >= 576)
 142         return &rs6000_aix64_regset;
 143     }
 144
 145   return NULL;
 146 }
 147
 148
 149 static enum gdb_osabi
 150 rs6000_aix_osabi_sniffer (bfd *abfd)
 151 {
 152
 153   if (bfd_get_flavour (abfd) == bfd_target_xcoff_flavour);
 154     return GDB_OSABI_AIX;
 155
 156   return GDB_OSABI_UNKNOWN;
 157 }
 158
 159 static void
 160 rs6000_aix_init_osabi (struct gdbarch_info info, struct gdbarch *gdbarch)
 161 {
 162   /* RS6000/AIX does not support PT_STEP.  Has to be simulated.  */
 163   set_gdbarch_software_single_step (gdbarch, rs6000_software_single_step);
 164
 165   /* Core file support.  */
 166   set_gdbarch_regset_from_core_section
 167     (gdbarch, rs6000_aix_regset_from_core_section);
 168
 169   /* Minimum possible text address in AIX.  */
 170   gdbarch_tdep (gdbarch)->text_segment_base = 0x10000000;
 171 }
 172
 173 void
 174 _initialize_rs6000_aix_tdep (void)
 175 {
 176   gdbarch_register_osabi_sniffer (bfd_arch_rs6000,
 177                                   bfd_target_xcoff_flavour,
 178                                   rs6000_aix_osabi_sniffer);
 179   gdbarch_register_osabi_sniffer (bfd_arch_powerpc,
 180                                   bfd_target_xcoff_flavour,
 181                                   rs6000_aix_osabi_sniffer);
 182
 183   gdbarch_register_osabi (bfd_arch_rs6000, 0, GDB_OSABI_AIX,
 184                           rs6000_aix_init_osabi);
 185   gdbarch_register_osabi (bfd_arch_powerpc, 0, GDB_OSABI_AIX,
 186                           rs6000_aix_init_osabi);
 187 }
 188