diff options
Diffstat (limited to 'lib/sanitizer_common/sanitizer_linux.h')
| -rw-r--r-- | lib/sanitizer_common/sanitizer_linux.h | 25 |
1 files changed, 17 insertions, 8 deletions
diff --git a/lib/sanitizer_common/sanitizer_linux.h b/lib/sanitizer_common/sanitizer_linux.h index c309e33f81b1..c28347ad963a 100644 --- a/lib/sanitizer_common/sanitizer_linux.h +++ b/lib/sanitizer_common/sanitizer_linux.h @@ -1,9 +1,8 @@ //===-- sanitizer_linux.h ---------------------------------------*- C++ -*-===// // -// The LLVM Compiler Infrastructure -// -// This file is distributed under the University of Illinois Open Source -// License. See LICENSE.TXT for details. +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception // //===----------------------------------------------------------------------===// // @@ -59,10 +58,6 @@ uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5); // (like the process-wide error reporting SEGV handler) must use // internal_sigaction instead. int internal_sigaction_norestorer(int signum, const void *act, void *oldact); -#if (defined(__x86_64__) || SANITIZER_MIPS64) && !SANITIZER_GO -// Uses a raw system call to avoid interceptors. -int internal_sigaction_syscall(int signum, const void *act, void *oldact); -#endif void internal_sigdelset(__sanitizer_sigset_t *set, int signum); #if defined(__x86_64__) || defined(__mips__) || defined(__aarch64__) \ || defined(__powerpc64__) || defined(__s390__) || defined(__i386__) \ @@ -72,6 +67,9 @@ uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg, #endif #elif SANITIZER_FREEBSD void internal_sigdelset(__sanitizer_sigset_t *set, int signum); +#elif SANITIZER_NETBSD +void internal_sigdelset(__sanitizer_sigset_t *set, int signum); +uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg); #endif // SANITIZER_LINUX // This class reads thread IDs from /proc/<pid>/task using only syscalls. @@ -106,6 +104,17 @@ bool LibraryNameIs(const char *full_name, const char *base_name); // Call cb for each region mapped by map. void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr)); +// Releases memory pages entirely within the [beg, end] address range. +// The pages no longer count toward RSS; reads are guaranteed to return 0. +// Requires (but does not verify!) that pages are MAP_PRIVATE. +INLINE void ReleaseMemoryPagesToOSAndZeroFill(uptr beg, uptr end) { + // man madvise on Linux promises zero-fill for anonymous private pages. + // Testing shows the same behaviour for private (but not anonymous) mappings + // of shm_open() files, as long as the underlying file is untouched. + CHECK(SANITIZER_LINUX); + ReleaseMemoryPagesToOS(beg, end); +} + #if SANITIZER_ANDROID #if defined(__aarch64__) |