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1 // Copyright (C) 2012-2018 Free Software Foundation, Inc.
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111
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2 //
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3 // This file is part of GCC.
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4 //
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5 // GCC is free software; you can redistribute it and/or modify
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6 // it under the terms of the GNU General Public License as published by
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7 // the Free Software Foundation; either version 3, or (at your option)
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8 // any later version.
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9
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10 // GCC is distributed in the hope that it will be useful,
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11 // but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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13 // GNU General Public License for more details.
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14
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15 // Under Section 7 of GPL version 3, you are granted additional
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16 // permissions described in the GCC Runtime Library Exception, version
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17 // 3.1, as published by the Free Software Foundation.
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18
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19 // You should have received a copy of the GNU General Public License and
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20 // a copy of the GCC Runtime Library Exception along with this program;
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21 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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22 // <http://www.gnu.org/licenses/>.
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23
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24 #ifndef _VTV_MALLOC_H
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25 #define _VTV_MALLOC_H 1
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26
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27 #include <stdlib.h>
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28
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29 /* Alignment mask for any object returned by the VTV memory pool */
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30 #ifdef __LP64__
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31 #define VTV_ALIGNMENT_MASK (0x7)
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32 #else
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33 #define VTV_ALIGNMENT_MASK (0x3)
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34 #endif
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35
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36 /* The following function is used to instrument the compiler and find
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37 out how many cycles are being spent in various vtable verification
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38 runtime library functions. */
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39
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40 #ifdef __x86_64__
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41 static inline unsigned long
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42 rdtsc ()
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43 {
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44 unsigned long long hi, lo;
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45
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46 asm volatile ("rdtsc" : "=a" (lo), "=d" (hi));
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47 return hi << 32 | lo;
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48 }
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49 #elif defined (__i386__)
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50 static inline unsigned long long
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51 rdtsc ()
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52 {
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53 unsigned long long var;
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54
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55 asm volatile ("rdtsc" : "=A" (var));
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56
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57 return var;
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58 }
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59 #else
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60 static inline unsigned long long
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61 rdtsc ()
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62 {
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63 /* Create an empty function for unknown architectures, so that the
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64 calls to this function in vtv_malloc.cc and vtv_rts.cc do not cause
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65 compilation errors. */
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66 return ((unsigned long long) 0);
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67 }
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68 #endif
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69
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70
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71 /* The following variables are used only for debugging and performance tuning
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72 purposes. Therefore they do not need to be "protected". They cannot be used
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73 to attack the vtable verification system and if they become corrupted it will
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74 not affect the correctness or security of any of the rest of the vtable
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75 verification feature. */
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76
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77 extern unsigned int num_calls_to_mprotect;
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78 extern unsigned int num_pages_protected;
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79 extern unsigned int num_calls_to_regset;
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80 extern unsigned int num_calls_to_regpair;
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81 extern unsigned long long mprotect_cycles;
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82 extern unsigned long long regset_cycles;
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83 extern unsigned long long regpair_cycles;
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84
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85
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86 /* Function declarations. */
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87
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88 extern void __vtv_malloc_init (void);
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89 extern void *__vtv_malloc (size_t size) __attribute__ ((malloc));
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90 extern void __vtv_free (void * ptr);
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91 extern void __vtv_malloc_protect (void);
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92 extern void __vtv_malloc_unprotect (void);
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93 extern void __vtv_malloc_stats (void);
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94 extern void __vtv_malloc_dump_stats (void);
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95 extern int __vtv_count_mmapped_pages (void);
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96
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97 #if defined (__CYGWIN__) || defined (__MINGW32__)
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98 extern "C" int mprotect (void *addr, int len, int prot);
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99
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100 #define PROT_READ 0x1
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101 #define PROT_WRITE 0x2
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102 #endif
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103
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104 #endif /* vtv_malloc.h */
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