1 /* Common target dependent code for GNU/Linux on PPC systems. 2 3 Copyright (C) 2018-2020 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.vsx) 54 tdesc = (features.htm? tdesc_powerpc_isa207_htm_vsx64l 55 : features.isa207? tdesc_powerpc_isa207_vsx64l 56 : features.ppr_dscr? tdesc_powerpc_isa205_ppr_dscr_vsx64l 57 : features.isa205? tdesc_powerpc_isa205_vsx64l 58 : tdesc_powerpc_vsx64l); 59 else if (features.altivec) 60 tdesc = (features.isa205? tdesc_powerpc_isa205_altivec64l 61 : tdesc_powerpc_altivec64l); 62 else 63 tdesc = (features.isa205? tdesc_powerpc_isa205_64l 64 : tdesc_powerpc_64l); 65 } 66 else 67 { 68 gdb_assert (features.wordsize == 4); 69 70 if (features.vsx) 71 tdesc = (features.htm? tdesc_powerpc_isa207_htm_vsx32l 72 : features.isa207? tdesc_powerpc_isa207_vsx32l 73 : features.ppr_dscr? tdesc_powerpc_isa205_ppr_dscr_vsx32l 74 : features.isa205? tdesc_powerpc_isa205_vsx32l 75 : tdesc_powerpc_vsx32l); 76 else if (features.altivec) 77 tdesc = (features.isa205? tdesc_powerpc_isa205_altivec32l 78 : tdesc_powerpc_altivec32l); 79 else 80 tdesc = (features.isa205? tdesc_powerpc_isa205_32l 81 : tdesc_powerpc_32l); 82 } 83 84 gdb_assert (tdesc != NULL); 85 86 return tdesc; 87 } 88