162 lines
5.4 KiB
C++
162 lines
5.4 KiB
C++
//===-- sanitizer_linux.h ---------------------------------------*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// Linux-specific syscall wrappers and classes.
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//
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//===----------------------------------------------------------------------===//
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#ifndef SANITIZER_LINUX_H
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#define SANITIZER_LINUX_H
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#include "sanitizer_platform.h"
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#if SANITIZER_FREEBSD || SANITIZER_LINUX || SANITIZER_NETBSD || \
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SANITIZER_SOLARIS
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#include "sanitizer_common.h"
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#include "sanitizer_internal_defs.h"
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#include "sanitizer_platform_limits_freebsd.h"
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#include "sanitizer_platform_limits_netbsd.h"
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#include "sanitizer_platform_limits_posix.h"
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#include "sanitizer_platform_limits_solaris.h"
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#include "sanitizer_posix.h"
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struct link_map; // Opaque type returned by dlopen().
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struct utsname;
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namespace __sanitizer {
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// Dirent structure for getdents(). Note that this structure is different from
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// the one in <dirent.h>, which is used by readdir().
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struct linux_dirent;
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struct ProcSelfMapsBuff {
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char *data;
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uptr mmaped_size;
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uptr len;
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};
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struct MemoryMappingLayoutData {
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ProcSelfMapsBuff proc_self_maps;
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const char *current;
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};
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void ReadProcMaps(ProcSelfMapsBuff *proc_maps);
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// Syscall wrappers.
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uptr internal_getdents(fd_t fd, struct linux_dirent *dirp, unsigned int count);
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uptr internal_sigaltstack(const void* ss, void* oss);
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uptr internal_sigprocmask(int how, __sanitizer_sigset_t *set,
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__sanitizer_sigset_t *oldset);
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uptr internal_clock_gettime(__sanitizer_clockid_t clk_id, void *tp);
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// Linux-only syscalls.
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#if SANITIZER_LINUX
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uptr internal_prctl(int option, uptr arg2, uptr arg3, uptr arg4, uptr arg5);
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// Used only by sanitizer_stoptheworld. Signal handlers that are actually used
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// (like the process-wide error reporting SEGV handler) must use
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// internal_sigaction instead.
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int internal_sigaction_norestorer(int signum, const void *act, void *oldact);
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void internal_sigdelset(__sanitizer_sigset_t *set, int signum);
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#if defined(__x86_64__) || defined(__mips__) || defined(__aarch64__) || \
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defined(__powerpc64__) || defined(__s390__) || defined(__i386__) || \
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defined(__arm__) || SANITIZER_RISCV64
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uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg,
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int *parent_tidptr, void *newtls, int *child_tidptr);
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#endif
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int internal_uname(struct utsname *buf);
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#elif SANITIZER_FREEBSD
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void internal_sigdelset(__sanitizer_sigset_t *set, int signum);
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#elif SANITIZER_NETBSD
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void internal_sigdelset(__sanitizer_sigset_t *set, int signum);
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uptr internal_clone(int (*fn)(void *), void *child_stack, int flags, void *arg);
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#endif // SANITIZER_LINUX
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// This class reads thread IDs from /proc/<pid>/task using only syscalls.
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class ThreadLister {
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public:
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explicit ThreadLister(pid_t pid);
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~ThreadLister();
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enum Result {
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Error,
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Incomplete,
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Ok,
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};
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Result ListThreads(InternalMmapVector<tid_t> *threads);
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private:
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bool IsAlive(int tid);
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pid_t pid_;
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int descriptor_ = -1;
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InternalMmapVector<char> buffer_;
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};
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// Exposed for testing.
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uptr ThreadDescriptorSize();
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uptr ThreadSelf();
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uptr ThreadSelfOffset();
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// Matches a library's file name against a base name (stripping path and version
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// information).
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bool LibraryNameIs(const char *full_name, const char *base_name);
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// Call cb for each region mapped by map.
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void ForEachMappedRegion(link_map *map, void (*cb)(const void *, uptr));
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// Releases memory pages entirely within the [beg, end] address range.
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// The pages no longer count toward RSS; reads are guaranteed to return 0.
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// Requires (but does not verify!) that pages are MAP_PRIVATE.
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inline void ReleaseMemoryPagesToOSAndZeroFill(uptr beg, uptr end) {
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// man madvise on Linux promises zero-fill for anonymous private pages.
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// Testing shows the same behaviour for private (but not anonymous) mappings
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// of shm_open() files, as long as the underlying file is untouched.
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CHECK(SANITIZER_LINUX);
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ReleaseMemoryPagesToOS(beg, end);
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}
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#if SANITIZER_ANDROID
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#if defined(__aarch64__)
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# define __get_tls() \
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({ void** __v; __asm__("mrs %0, tpidr_el0" : "=r"(__v)); __v; })
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#elif defined(__arm__)
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# define __get_tls() \
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({ void** __v; __asm__("mrc p15, 0, %0, c13, c0, 3" : "=r"(__v)); __v; })
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#elif defined(__mips__)
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// On mips32r1, this goes via a kernel illegal instruction trap that's
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// optimized for v1.
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# define __get_tls() \
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({ register void** __v asm("v1"); \
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__asm__(".set push\n" \
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".set mips32r2\n" \
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"rdhwr %0,$29\n" \
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".set pop\n" : "=r"(__v)); \
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__v; })
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#elif defined(__i386__)
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# define __get_tls() \
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({ void** __v; __asm__("movl %%gs:0, %0" : "=r"(__v)); __v; })
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#elif defined(__x86_64__)
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# define __get_tls() \
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({ void** __v; __asm__("mov %%fs:0, %0" : "=r"(__v)); __v; })
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#else
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#error "Unsupported architecture."
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#endif
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// The Android Bionic team has allocated a TLS slot for sanitizers starting
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// with Q, given that Android currently doesn't support ELF TLS. It is used to
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// store sanitizer thread specific data.
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static const int TLS_SLOT_SANITIZER = 6;
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ALWAYS_INLINE uptr *get_android_tls_ptr() {
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return reinterpret_cast<uptr *>(&__get_tls()[TLS_SLOT_SANITIZER]);
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}
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#endif // SANITIZER_ANDROID
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} // namespace __sanitizer
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#endif
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#endif // SANITIZER_LINUX_H
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