diff options
Diffstat (limited to 'lib/tsan/rtl/tsan_interceptors_mac.cc')
| -rw-r--r-- | lib/tsan/rtl/tsan_interceptors_mac.cc | 39 |
1 files changed, 35 insertions, 4 deletions
diff --git a/lib/tsan/rtl/tsan_interceptors_mac.cc b/lib/tsan/rtl/tsan_interceptors_mac.cc index 579c4d0c0..99c6df9df 100644 --- a/lib/tsan/rtl/tsan_interceptors_mac.cc +++ b/lib/tsan/rtl/tsan_interceptors_mac.cc @@ -1,9 +1,8 @@ //===-- tsan_interceptors_mac.cc ------------------------------------------===// // -// 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 // //===----------------------------------------------------------------------===// // @@ -21,8 +20,10 @@ #include "tsan_interface_ann.h" #include "sanitizer_common/sanitizer_addrhashmap.h" +#include <errno.h> #include <libkern/OSAtomic.h> #include <objc/objc-sync.h> +#include <sys/ucontext.h> #if defined(__has_include) && __has_include(<xpc/xpc.h>) #include <xpc/xpc.h> @@ -30,6 +31,11 @@ typedef long long_t; // NOLINT +extern "C" { +int getcontext(ucontext_t *ucp) __attribute__((returns_twice)); +int setcontext(const ucontext_t *ucp); +} + namespace __tsan { // The non-barrier versions of OSAtomic* functions are semantically mo_relaxed, @@ -354,6 +360,31 @@ TSAN_INTERCEPTOR(int, objc_sync_exit, id obj) { return result; } +TSAN_INTERCEPTOR(int, swapcontext, ucontext_t *oucp, const ucontext_t *ucp) { + { + SCOPED_INTERCEPTOR_RAW(swapcontext, oucp, ucp); + } + // Bacause of swapcontext() semantics we have no option but to copy its + // impementation here + if (!oucp || !ucp) { + errno = EINVAL; + return -1; + } + ThreadState *thr = cur_thread(); + const int UCF_SWAPPED = 0x80000000; + oucp->uc_onstack &= ~UCF_SWAPPED; + thr->ignore_interceptors++; + int ret = getcontext(oucp); + if (!(oucp->uc_onstack & UCF_SWAPPED)) { + thr->ignore_interceptors--; + if (!ret) { + oucp->uc_onstack |= UCF_SWAPPED; + ret = setcontext(ucp); + } + } + return ret; +} + // On macOS, libc++ is always linked dynamically, so intercepting works the // usual way. #define STDCXX_INTERCEPTOR TSAN_INTERCEPTOR |