105 lines
3.1 KiB
C
105 lines
3.1 KiB
C
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// Copyright (C) 2012-2022 Free Software Foundation, Inc.
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//
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// This file is part of GCC.
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//
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// GCC is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// GCC is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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#ifndef _VTV_MALLOC_H
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#define _VTV_MALLOC_H 1
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#include <stdlib.h>
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/* Alignment mask for any object returned by the VTV memory pool */
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#ifdef __LP64__
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#define VTV_ALIGNMENT_MASK (0x7)
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#else
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#define VTV_ALIGNMENT_MASK (0x3)
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#endif
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/* The following function is used to instrument the compiler and find
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out how many cycles are being spent in various vtable verification
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runtime library functions. */
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#ifdef __x86_64__
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static inline unsigned long
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rdtsc ()
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{
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unsigned long long hi, lo;
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asm volatile ("rdtsc" : "=a" (lo), "=d" (hi));
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return hi << 32 | lo;
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}
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#elif defined (__i386__)
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static inline unsigned long long
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rdtsc ()
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{
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unsigned long long var;
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asm volatile ("rdtsc" : "=A" (var));
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return var;
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}
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#else
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static inline unsigned long long
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rdtsc ()
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{
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/* Create an empty function for unknown architectures, so that the
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calls to this function in vtv_malloc.cc and vtv_rts.cc do not cause
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compilation errors. */
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return ((unsigned long long) 0);
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}
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#endif
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/* The following variables are used only for debugging and performance tuning
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purposes. Therefore they do not need to be "protected". They cannot be used
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to attack the vtable verification system and if they become corrupted it will
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not affect the correctness or security of any of the rest of the vtable
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verification feature. */
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extern unsigned int num_calls_to_mprotect;
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extern unsigned int num_pages_protected;
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extern unsigned int num_calls_to_regset;
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extern unsigned int num_calls_to_regpair;
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extern unsigned long long mprotect_cycles;
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extern unsigned long long regset_cycles;
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extern unsigned long long regpair_cycles;
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/* Function declarations. */
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extern void __vtv_malloc_init (void);
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extern void *__vtv_malloc (size_t size) __attribute__ ((malloc));
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extern void __vtv_free (void * ptr);
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extern void __vtv_malloc_protect (void);
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extern void __vtv_malloc_unprotect (void);
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extern void __vtv_malloc_stats (void);
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extern void __vtv_malloc_dump_stats (void);
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extern int __vtv_count_mmapped_pages (void);
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#if defined (__CYGWIN__) || defined (__MINGW32__)
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extern "C" int mprotect (void *addr, int len, int prot);
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#define PROT_READ 0x1
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#define PROT_WRITE 0x2
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#endif
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#endif /* vtv_malloc.h */
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