1 /* Get CPU type and Features for x86 processors. 2 Copyright (C) 2012-2022 Free Software Foundation, Inc. 3 Contributed by Sriraman Tallam (tmsriram@google.com) 4 5 This file is part of GCC. 6 7 GCC is free software; you can redistribute it and/or modify it under 8 the terms of the GNU General Public License as published by the Free 9 Software Foundation; either version 3, or (at your option) any later 10 version. 11 12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY 13 WARRANTY; without even the implied warranty of MERCHANTABILITY or 14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 15 for more details. 16 17 Under Section 7 of GPL version 3, you are granted additional 18 permissions described in the GCC Runtime Library Exception, version 19 3.1, as published by the Free Software Foundation. 20 21 You should have received a copy of the GNU General Public License and 22 a copy of the GCC Runtime Library Exception along with this program; 23 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 <http://www.gnu.org/licenses/>. */ 25 26 #include "cpuid.h" 27 #include "tsystem.h" 28 #include "auto-target.h" 29 #include "common/config/i386/i386-cpuinfo.h" 30 #include "common/config/i386/cpuinfo.h" 31 32 #ifdef HAVE_INIT_PRIORITY 33 #define CONSTRUCTOR_PRIORITY (101) 34 #else 35 #define CONSTRUCTOR_PRIORITY 36 #endif 37 38 int __cpu_indicator_init (void) 39 __attribute__ ((constructor CONSTRUCTOR_PRIORITY)); 40 41 42 struct __processor_model __cpu_model = { }; 43 /* We want to move away from __cpu_model in libgcc_s.so.1 and the 44 size of __cpu_model is part of ABI. So, new features that don't 45 fit into __cpu_model.__cpu_features[0] go into extra variables 46 in libgcc.a only, preferably hidden. 47 48 NB: Since older 386-builtins.c accesses __cpu_features2 as scalar or 49 smaller array, it can only access the first few elements. */ 50 unsigned int __cpu_features2[SIZE_OF_CPU_FEATURES]; 51 52 /* A constructor function that is sets __cpu_model and __cpu_features with 53 the right values. This needs to run only once. This constructor is 54 given the highest priority and it should run before constructors without 55 the priority set. However, it still runs after ifunc initializers and 56 needs to be called explicitly there. */ 57 58 int __attribute__ ((constructor CONSTRUCTOR_PRIORITY)) 59 __cpu_indicator_init (void) 60 { 61 struct __processor_model2 cpu_model2; 62 return cpu_indicator_init (&__cpu_model, &cpu_model2, 63 __cpu_features2); 64 } 65 66 #if defined SHARED && defined USE_ELF_SYMVER 67 __asm__ (".symver __cpu_indicator_init, __cpu_indicator_init@GCC_4.8.0"); 68 __asm__ (".symver __cpu_model, __cpu_model@GCC_4.8.0"); 69 #endif 70