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7adcbafe | 1 | // Copyright (C) 2012-2022 Free Software Foundation, Inc. |
2077db1b CT |
2 | // |
3 | // This file is part of GCC. | |
4 | // | |
5 | // GCC 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, or (at your option) | |
8 | // any later version. | |
9 | ||
10 | // GCC 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 | // Under Section 7 of GPL version 3, you are granted additional | |
16 | // permissions described in the GCC Runtime Library Exception, version | |
17 | // 3.1, as published by the Free Software Foundation. | |
18 | ||
19 | // You should have received a copy of the GNU General Public License and | |
20 | // a copy of the GCC Runtime Library Exception along with this program; | |
21 | // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
22 | // <http://www.gnu.org/licenses/>. | |
23 | ||
24 | #ifndef _VTV_MALLOC_H | |
25 | #define _VTV_MALLOC_H 1 | |
26 | ||
27 | #include <stdlib.h> | |
28 | ||
29 | /* Alignment mask for any object returned by the VTV memory pool */ | |
30 | #ifdef __LP64__ | |
31 | #define VTV_ALIGNMENT_MASK (0x7) | |
32 | #else | |
33 | #define VTV_ALIGNMENT_MASK (0x3) | |
34 | #endif | |
35 | ||
36 | /* The following function is used to instrument the compiler and find | |
37 | out how many cycles are being spent in various vtable verification | |
38 | runtime library functions. */ | |
39 | ||
40 | #ifdef __x86_64__ | |
41 | static inline unsigned long | |
42 | rdtsc () | |
43 | { | |
44 | unsigned long long hi, lo; | |
45 | ||
46 | asm volatile ("rdtsc" : "=a" (lo), "=d" (hi)); | |
47 | return hi << 32 | lo; | |
48 | } | |
49 | #elif defined (__i386__) | |
50 | static inline unsigned long long | |
51 | rdtsc () | |
52 | { | |
53 | unsigned long long var; | |
54 | ||
55 | asm volatile ("rdtsc" : "=A" (var)); | |
56 | ||
57 | return var; | |
58 | } | |
59 | #else | |
60 | static inline unsigned long long | |
61 | rdtsc () | |
62 | { | |
63 | /* Create an empty function for unknown architectures, so that the | |
64 | calls to this function in vtv_malloc.cc and vtv_rts.cc do not cause | |
65 | compilation errors. */ | |
66 | return ((unsigned long long) 0); | |
67 | } | |
68 | #endif | |
69 | ||
70 | ||
71 | /* The following variables are used only for debugging and performance tuning | |
72 | purposes. Therefore they do not need to be "protected". They cannot be used | |
73 | to attack the vtable verification system and if they become corrupted it will | |
74 | not affect the correctness or security of any of the rest of the vtable | |
75 | verification feature. */ | |
76 | ||
77 | extern unsigned int num_calls_to_mprotect; | |
78 | extern unsigned int num_pages_protected; | |
79 | extern unsigned int num_calls_to_regset; | |
80 | extern unsigned int num_calls_to_regpair; | |
81 | extern unsigned long long mprotect_cycles; | |
82 | extern unsigned long long regset_cycles; | |
83 | extern unsigned long long regpair_cycles; | |
84 | ||
85 | ||
86 | /* Function declarations. */ | |
87 | ||
88 | extern void __vtv_malloc_init (void); | |
89 | extern void *__vtv_malloc (size_t size) __attribute__ ((malloc)); | |
90 | extern void __vtv_free (void * ptr); | |
91 | extern void __vtv_malloc_protect (void); | |
92 | extern void __vtv_malloc_unprotect (void); | |
93 | extern void __vtv_malloc_stats (void); | |
94 | extern void __vtv_malloc_dump_stats (void); | |
95 | extern int __vtv_count_mmapped_pages (void); | |
96 | ||
f7f049fa CT |
97 | #if defined (__CYGWIN__) || defined (__MINGW32__) |
98 | extern "C" int mprotect (void *addr, int len, int prot); | |
99 | ||
100 | #define PROT_READ 0x1 | |
101 | #define PROT_WRITE 0x2 | |
102 | #endif | |
103 | ||
2077db1b | 104 | #endif /* vtv_malloc.h */ |