1 /*Copyright (C) 2015-2016 Free Software Foundation, Inc. 2 3 This file is part of GDB. 4 5 This program is free software; you can redistribute it and/or modify 6 it under the terms of the GNU General Public License as published by 7 the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13 GNU General Public License for more details. 14 15 You should have received a copy of the GNU General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18 #include "common-defs.h" 19 #include "ppc-linux.h" 20 #include <elf.h> 21 22 #ifdef HAVE_GETAUXVAL 23 #include <sys/auxv.h> 24 #endif 25 26 #ifdef __powerpc64__ 27 28 /* Get the HWCAP from the process of GDB or GDBserver. If success, 29 save it in *VALP. */ 30 31 static void 32 ppc64_host_hwcap (unsigned long *valp) 33 { 34 #ifdef HAVE_GETAUXVAL 35 *valp = getauxval (AT_HWCAP); 36 #else 37 unsigned long data[2]; 38 FILE *f = fopen ("/proc/self/auxv", "r"); 39 40 if (f == NULL) 41 return; 42 43 while (fread (data, sizeof (data), 1, f) > 0) 44 { 45 if (data[0] == AT_HWCAP) 46 { 47 *valp = data[1]; 48 break; 49 } 50 } 51 52 fclose (f); 53 #endif /* HAVE_GETAUXVAL */ 54 } 55 56 int 57 ppc64_64bit_inferior_p (long msr) 58 { 59 unsigned long ppc_host_hwcap = 0; 60 61 /* Get host's HWCAP to check whether the machine is Book E. */ 62 ppc64_host_hwcap (&ppc_host_hwcap); 63 64 /* We actually have a 64-bit inferior only if the certain bit of the 65 MSR is set. The PowerISA Book III-S MSR is different from the 66 PowerISA Book III-E MSR. The Book III-S MSR is 64 bits wide, and 67 its MSR[SF] is the bit 0 of a 64-bit value. Book III-E MSR is 32 68 bits wide, and its MSR[CM] is the bit 0 of a 32-bit value. */ 69 if (ppc_host_hwcap & PPC_FEATURE_BOOKE) 70 return msr & 0x80000000; 71 else 72 return msr < 0; 73 } 74 75 #endif 76