gdb/arch/ppc-linux-common.c

   1 /* Common target dependent code for GNU/Linux on PPC systems.
   2
   3    Copyright (C) 2018-2019 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 "gdbsupport/common-defs.h"
  21 #include "arch/ppc-linux-common.h"
  22 #include "arch/ppc-linux-tdesc.h"
  23
  24 /* Decimal Floating Point bit in AT_HWCAP.
  25
  26    This file can be used by a host with another architecture, e.g.
  27    when debugging core files, which might not provide this constant.  */
  28
  29 #ifndef PPC_FEATURE_HAS_DFP
  30 #define PPC_FEATURE_HAS_DFP     0x00000400
  31 #endif
  32
  33 bool
  34 ppc_linux_has_isa205 (CORE_ADDR hwcap)
  35 {
  36   /* Power ISA 2.05 (implemented by Power 6 and newer processors)
  37      increases the FPSCR from 32 bits to 64 bits.  Even though Power 7
  38      supports this ISA version, it doesn't have PPC_FEATURE_ARCH_2_05
  39      set, only PPC_FEATURE_ARCH_2_06.  Since for now the only bits
  40      used in the higher half of the register are for Decimal Floating
  41      Point, we check if that feature is available to decide the size
  42      of the FPSCR.  */
  43   return ((hwcap & PPC_FEATURE_HAS_DFP) != 0);
  44 }
  45
  46 const struct target_desc *
  47 ppc_linux_match_description (struct ppc_linux_features features)
  48 {
  49   struct target_desc *tdesc = NULL;
  50
  51   if (features.wordsize == 8)
  52     {
  53       if (features.cell)
  54         tdesc = tdesc_powerpc_cell64l;
  55       else if (features.vsx)
  56         tdesc = (features.htm? tdesc_powerpc_isa207_htm_vsx64l
  57                  : features.isa207? tdesc_powerpc_isa207_vsx64l
  58                  : features.ppr_dscr? tdesc_powerpc_isa205_ppr_dscr_vsx64l
  59                  : features.isa205? tdesc_powerpc_isa205_vsx64l
  60                  : tdesc_powerpc_vsx64l);
  61       else if (features.altivec)
  62         tdesc = (features.isa205? tdesc_powerpc_isa205_altivec64l
  63                  : tdesc_powerpc_altivec64l);
  64       else
  65         tdesc = (features.isa205? tdesc_powerpc_isa205_64l
  66                  : tdesc_powerpc_64l);
  67     }
  68   else
  69     {
  70       gdb_assert (features.wordsize == 4);
  71
  72       if (features.cell)
  73         tdesc = tdesc_powerpc_cell32l;
  74       else if (features.vsx)
  75         tdesc = (features.htm? tdesc_powerpc_isa207_htm_vsx32l
  76                  : features.isa207? tdesc_powerpc_isa207_vsx32l
  77                  : features.ppr_dscr? tdesc_powerpc_isa205_ppr_dscr_vsx32l
  78                  : features.isa205? tdesc_powerpc_isa205_vsx32l
  79                  : tdesc_powerpc_vsx32l);
  80       else if (features.altivec)
  81         tdesc = (features.isa205? tdesc_powerpc_isa205_altivec32l
  82                  : tdesc_powerpc_altivec32l);
  83       else
  84         tdesc = (features.isa205? tdesc_powerpc_isa205_32l
  85                  : tdesc_powerpc_32l);
  86     }
  87
  88   gdb_assert (tdesc != NULL);
  89
  90   return tdesc;
  91 }