Add NetBSD improvements in sanitizers

Summary:
Changes:

 * Add initial msan stub support.
 * Handle NetBSD specific pthread_setname_np(3).
 * NetBSD supports __attribute__((tls_model("initial-exec"))),
   define it in SANITIZER_TLS_INITIAL_EXEC_ATTRIBUTE.
 * Add ReExec() specific bits for NetBSD.
 * Simplify code and add syscall64 and syscall_ptr for !NetBSD.
 * Correct bunch of syscall wrappers for NetBSD.
 * Disable test/tsan/map32bit on NetBSD as not applicable.
 * Port test/tsan/strerror_r to a POSIX-compliant OSes.
 * Disable __libc_stack_end on NetBSD.
 * Disable ReadNullSepFileToArray() on NetBSD.
 * Define struct_ElfW_Phdr_sz, detected missing symbol by msan.
 * Change type of __sanitizer_FILE from void to char. This helps
   to reuse this type as an array. Long term it will be properly
   implemented along with SANITIZER_HAS_STRUCT_FILE setting to 1.
 * Add initial NetBSD support in lib/tsan/go/buildgo.sh.
 * Correct referencing stdout and stderr in tsan_interceptors.cc
   on NetBSD.
 * Document NetBSD x86_64 specific virtual memory layout in
   tsan_platform.h.
 * Port tests/rtl/tsan_test_util_posix.cc to NetBSD.
 * Enable NetBSD tests in test/msan/lit.cfg.
 * Enable NetBSD tests in test/tsan/lit.cfg.

Sponsored by <The NetBSD Foundation>

Reviewers: joerg, vitalybuka, eugenis, kcc, dvyukov

Reviewed By: dvyukov

Subscribers: #sanitizers, llvm-commits, kubamracek

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D39124

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@316591 91177308-0d34-0410-b5e6-96231b3b80d8

3 files changed, 27 insertions, 5 deletions

diff --git a/lib/tsan/rtl/tsan_interceptors.cc b/lib/tsan/rtl/tsan_interceptors.cc
index 908378ff4..79e243aef 100644
--- a/lib/tsan/rtl/tsan_interceptors.cc
+++ b/lib/tsan/rtl/tsan_interceptors.cc
@@ -43,8 +43,16 @@ using namespace __tsan;  // NOLINT
 #if SANITIZER_NETBSD
 #define dirfd(dirp) (*(int *)(dirp))
 #define fileno_unlocked fileno
-#define stdout __sF[1]
-#define stderr __sF[2]
+
+#if _LP64
+#define __sF_size 152
+#else
+#define __sF_size 88
+#endif
+
+#define stdout ((char*)&__sF + (__sF_size * 1))
+#define stderr ((char*)&__sF + (__sF_size * 2))
+
 #endif
 
 #if SANITIZER_ANDROID
@@ -99,7 +107,7 @@ extern "C" int dirfd(void *dirp);
 extern "C" int mallopt(int param, int value);
 #endif
 #if SANITIZER_NETBSD
-extern __sanitizer_FILE **__sF;
+extern __sanitizer_FILE __sF[];
 #else
 extern __sanitizer_FILE *stdout, *stderr;
 #endif
diff --git a/lib/tsan/rtl/tsan_platform.h b/lib/tsan/rtl/tsan_platform.h
index bea1daba3..4b9771359 100644
--- a/lib/tsan/rtl/tsan_platform.h
+++ b/lib/tsan/rtl/tsan_platform.h
@@ -42,6 +42,19 @@ C/C++ on linux/x86_64 and freebsd/x86_64
 7b00 0000 0000 - 7c00 0000 0000: heap
 7c00 0000 0000 - 7e80 0000 0000: -
 7e80 0000 0000 - 8000 0000 0000: modules and main thread stack
+
+C/C++ on netbsd/amd64 can reuse the same mapping:
+ * The address space starts from 0x1000 (option with 0x0) and ends with
+   0x7f7ffffff000.
+ * LoAppMem-kHeapMemEnd can be reused as it is.
+ * No VDSO support.
+ * No MidAppMem region.
+ * No additional HeapMem region.
+ * HiAppMem contains the stack, loader, shared libraries and heap.
+ * Stack on NetBSD/amd64 has prereserved 128MB.
+ * Heap grows downwards (top-down).
+ * ASLR must be disabled per-process or globally.
+
 */
 struct Mapping {
   static const uptr kMetaShadowBeg = 0x300000000000ull;
diff --git a/lib/tsan/rtl/tsan_platform_linux.cc b/lib/tsan/rtl/tsan_platform_linux.cc
index ead1e5704..216eef93c 100644
--- a/lib/tsan/rtl/tsan_platform_linux.cc
+++ b/lib/tsan/rtl/tsan_platform_linux.cc
@@ -14,11 +14,12 @@
 
 
 #include "sanitizer_common/sanitizer_platform.h"
-#if SANITIZER_LINUX || SANITIZER_FREEBSD
+#if SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD
 
 #include "sanitizer_common/sanitizer_common.h"
 #include "sanitizer_common/sanitizer_libc.h"
 #include "sanitizer_common/sanitizer_linux.h"
+#include "sanitizer_common/sanitizer_platform_limits_netbsd.h"
 #include "sanitizer_common/sanitizer_platform_limits_posix.h"
 #include "sanitizer_common/sanitizer_posix.h"
 #include "sanitizer_common/sanitizer_procmaps.h"
@@ -401,4 +402,4 @@ void cur_thread_finalize() {
 
 }  // namespace __tsan
 
-#endif  // SANITIZER_LINUX || SANITIZER_FREEBSD
+#endif  // SANITIZER_LINUX || SANITIZER_FREEBSD || SANITIZER_NETBSD