Module Name: src
Committed By: christos
Date: Fri Oct 17 21:44:47 UTC 2014
Modified Files:
src/external/gpl3/gcc/dist/libsanitizer/asan: asan_rtl.cc
src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common:
sanitizer_platform_limits_posix.cc sanitizer_posix.cc
sanitizer_procmaps.h sanitizer_symbolizer_linux.cc
Added Files:
src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common:
sanitizer_netbsd.cc
Log Message:
more fixes: builds and runs now, but coredumps after stackgap mprotect (mmap)
To generate a diff of this commit:
cvs rdiff -u -r1.1.1.1 -r1.2 \
src/external/gpl3/gcc/dist/libsanitizer/asan/asan_rtl.cc
cvs rdiff -u -r0 -r1.1 \
src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_netbsd.cc
cvs rdiff -u -r1.1.1.1 -r1.2 \
src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
\
src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_posix.cc
\
src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_procmaps.h \
src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_symbolizer_linux.cc
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
Modified files:
Index: src/external/gpl3/gcc/dist/libsanitizer/asan/asan_rtl.cc
diff -u src/external/gpl3/gcc/dist/libsanitizer/asan/asan_rtl.cc:1.1.1.1 src/external/gpl3/gcc/dist/libsanitizer/asan/asan_rtl.cc:1.2
--- src/external/gpl3/gcc/dist/libsanitizer/asan/asan_rtl.cc:1.1.1.1 Sat Mar 1 03:41:18 2014
+++ src/external/gpl3/gcc/dist/libsanitizer/asan/asan_rtl.cc Fri Oct 17 17:44:47 2014
@@ -133,8 +133,10 @@ void InitializeFlags(Flags *f, const cha
f->quarantine_size = (ASAN_LOW_MEMORY) ? 1UL << 26 : 1UL << 28;
f->symbolize = false;
f->verbosity = 0;
+f->verbosity = 100;
f->redzone = ASAN_ALLOCATOR_VERSION == 2 ? 16 : (ASAN_LOW_MEMORY) ? 64 : 128;
f->debug = false;
+f->debug = true;
f->report_globals = 1;
f->check_initialization_order = true;
f->malloc_context_size = kDeafultMallocContextSize;
@@ -152,6 +154,7 @@ void InitializeFlags(Flags *f, const cha
f->unmap_shadow_on_exit = false;
f->abort_on_error = false;
f->print_stats = false;
+f->print_stats = true;
f->print_legend = true;
f->atexit = false;
f->disable_core = (SANITIZER_WORDSIZE == 64);
Index: src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc
diff -u src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc:1.1.1.1 src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc:1.2
--- src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc:1.1.1.1 Sat Mar 1 03:41:18 2014
+++ src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_platform_limits_posix.cc Fri Oct 17 17:44:47 2014
@@ -10,7 +10,7 @@
// Sizes and layouts of platform-specific POSIX data structures.
//===----------------------------------------------------------------------===//
-#if defined(__linux__) || defined(__APPLE__)
+#if defined(__linux__) || defined(__APPLE__) || defined(__NetBSD__)
#include "sanitizer_internal_defs.h"
#include "sanitizer_platform_limits_posix.h"
@@ -32,7 +32,9 @@
namespace __sanitizer {
unsigned struct_utsname_sz = sizeof(struct utsname);
unsigned struct_stat_sz = sizeof(struct stat);
+#if defined(__linux__) || defined(__APPLE__)
unsigned struct_stat64_sz = sizeof(struct stat64);
+#endif
unsigned struct_rusage_sz = sizeof(struct rusage);
unsigned struct_tm_sz = sizeof(struct tm);
@@ -65,4 +67,4 @@ namespace __sanitizer {
}
} // namespace __sanitizer
-#endif // __linux__ || __APPLE__
+#endif // __linux__ || __APPLE__ || __NetBSD__
Index: src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_posix.cc
diff -u src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_posix.cc:1.1.1.1 src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_posix.cc:1.2
--- src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_posix.cc:1.1.1.1 Sat Mar 1 03:41:18 2014
+++ src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_posix.cc Fri Oct 17 17:44:47 2014
@@ -9,7 +9,7 @@
// run-time libraries and implements POSIX-specific functions from
// sanitizer_libc.h.
//===----------------------------------------------------------------------===//
-#if defined(__linux__) || defined(__APPLE__)
+#if defined(__linux__) || defined(__APPLE__) || defined(__NetBSD__)
#include "sanitizer_common.h"
#include "sanitizer_libc.h"
@@ -225,4 +225,4 @@ int internal_isatty(fd_t fd) {
} // namespace __sanitizer
-#endif // __linux__ || __APPLE_
+#endif // __linux__ || __APPLE_ || __NetBSD__
Index: src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_procmaps.h
diff -u src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_procmaps.h:1.1.1.1 src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_procmaps.h:1.2
--- src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_procmaps.h:1.1.1.1 Sat Mar 1 03:41:18 2014
+++ src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_procmaps.h Fri Oct 17 17:44:47 2014
@@ -28,13 +28,13 @@ class MemoryMappingLayout {
};
#else // _WIN32
-#if defined(__linux__)
+#if defined(__linux__) || defined(__NetBSD__)
struct ProcSelfMapsBuff {
char *data;
uptr mmaped_size;
uptr len;
};
-#endif // defined(__linux__)
+#endif // defined(__linux__) || defined(__NetBSD__)
class MemoryMappingLayout {
public:
@@ -84,7 +84,7 @@ class MemoryMappingLayout {
return false;
}
-# if defined __linux__
+# if defined __linux__ || defined(__NetBSD__)
ProcSelfMapsBuff proc_self_maps_;
char *current_;
Index: src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_symbolizer_linux.cc
diff -u src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_symbolizer_linux.cc:1.1.1.1 src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_symbolizer_linux.cc:1.2
--- src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_symbolizer_linux.cc:1.1.1.1 Sat Mar 1 03:41:18 2014
+++ src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_symbolizer_linux.cc Fri Oct 17 17:44:47 2014
@@ -9,7 +9,7 @@
// run-time libraries.
// Linux-specific implementation of symbolizer parts.
//===----------------------------------------------------------------------===//
-#ifdef __linux__
+#if defined(__linux__) || defined(__NetBSD__)
#include "sanitizer_common.h"
#include "sanitizer_internal_defs.h"
#include "sanitizer_libc.h"
@@ -124,7 +124,9 @@ uptr GetListOfModules(LoadedModule *modu
UNIMPLEMENTED();
}
#else // ANDROID
+#ifdef ElfW
typedef ElfW(Phdr) Elf_Phdr;
+#endif
struct DlIteratePhdrData {
LoadedModule *modules;
@@ -175,6 +177,10 @@ uptr GetListOfModules(LoadedModule *modu
}
#endif // ANDROID
+const char *Demangle(const char *MangledName) {
+ return MangledName;
+}
+
} // namespace __sanitizer
-#endif // __linux__
+#endif // __linux__ || __NetBSD__
Added files:
Index: src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_netbsd.cc
diff -u /dev/null src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_netbsd.cc:1.1
--- /dev/null Fri Oct 17 17:44:47 2014
+++ src/external/gpl3/gcc/dist/libsanitizer/sanitizer_common/sanitizer_netbsd.cc Fri Oct 17 17:44:47 2014
@@ -0,0 +1,482 @@
+//===-- sanitizer_netbsd.cc -----------------------------------------------===//
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file is shared between AddressSanitizer and ThreadSanitizer
+// run-time libraries and implements linux-specific functions from
+// sanitizer_libc.h.
+//===----------------------------------------------------------------------===//
+#ifdef __NetBSD__
+
+#include "sanitizer_common.h"
+#include "sanitizer_internal_defs.h"
+#include "sanitizer_libc.h"
+#include "sanitizer_mutex.h"
+#include "sanitizer_placement_new.h"
+#include "sanitizer_procmaps.h"
+#include "sanitizer_stacktrace.h"
+
+#include <fcntl.h>
+#include <pthread.h>
+#include <sched.h>
+#include <sys/mman.h>
+#include <sys/resource.h>
+#include <sys/stat.h>
+#include <sys/syscall.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <unwind.h>
+#include <errno.h>
+
+namespace __sanitizer {
+
+// --------------- sanitizer_libc.h
+void *internal_mmap(void *addr, uptr length, int prot, int flags,
+ int fd, u64 offset) {
+ return (void *)__syscall(SYS_mmap, addr, length, prot, flags,
+ fd, 0, offset);
+}
+
+int internal_munmap(void *addr, uptr length) {
+ return syscall(SYS_munmap, addr, length);
+}
+
+int internal_close(fd_t fd) {
+ return syscall(SYS_close, fd);
+}
+
+fd_t internal_open(const char *filename, int flags) {
+ return syscall(SYS_open, filename, flags);
+}
+
+fd_t internal_open(const char *filename, int flags, u32 mode) {
+ return syscall(SYS_open, filename, flags, mode);
+}
+
+fd_t OpenFile(const char *filename, bool write) {
+ return internal_open(filename,
+ write ? O_WRONLY | O_CREAT /*| O_CLOEXEC*/ : O_RDONLY, 0660);
+}
+
+uptr internal_read(fd_t fd, void *buf, uptr count) {
+ sptr res;
+ HANDLE_EINTR(res, (sptr)syscall(SYS_read, fd, buf, count));
+ return res;
+}
+
+uptr internal_write(fd_t fd, const void *buf, uptr count) {
+ sptr res;
+ HANDLE_EINTR(res, (sptr)syscall(SYS_write, fd, buf, count));
+ return res;
+}
+
+int internal_stat(const char *path, void *buf) {
+ return syscall(SYS___stat50, path, buf);
+}
+
+int internal_lstat(const char *path, void *buf) {
+ return syscall(SYS___lstat50, path, buf);
+}
+
+int internal_fstat(fd_t fd, void *buf) {
+ return syscall(SYS___fstat50, fd, buf);
+}
+
+uptr internal_filesize(fd_t fd) {
+ struct stat st;
+ if (internal_fstat(fd, &st))
+ return -1;
+ return (uptr)st.st_size;
+}
+
+int internal_dup2(int oldfd, int newfd) {
+ return syscall(SYS_dup2, oldfd, newfd);
+}
+
+uptr internal_readlink(const char *path, char *buf, uptr bufsize) {
+ return (uptr)syscall(SYS_readlink, path, buf, bufsize);
+}
+
+int internal_sched_yield() {
+ return syscall(SYS_sched_yield);
+}
+
+void internal__exit(int exitcode) {
+ syscall(SYS_exit, exitcode);
+ Die(); // Unreachable.
+}
+
+// ----------------- sanitizer_common.h
+bool FileExists(const char *filename) {
+ struct stat st;
+ if (syscall(SYS___stat50, filename, &st))
+ return false;
+ // Sanity check: filename is a regular file.
+ return S_ISREG(st.st_mode);
+}
+
+uptr GetTid() {
+ // XXX!
+ return syscall(SYS_getpid);
+}
+
+void GetThreadStackTopAndBottom(bool at_initialization, uptr *stack_top,
+ uptr *stack_bottom) {
+ static const uptr kMaxThreadStackSize = 256 * (1 << 20); // 256M
+ CHECK(stack_top);
+ CHECK(stack_bottom);
+ if (at_initialization) {
+ // This is the main thread. Libpthread may not be initialized yet.
+ struct rlimit rl;
+ CHECK_EQ(getrlimit(RLIMIT_STACK, &rl), 0);
+
+ // Find the mapping that contains a stack variable.
+ MemoryMappingLayout proc_maps;
+ uptr start, end, offset;
+ uptr prev_end = 0;
+ while (proc_maps.Next(&start, &end, &offset, 0, 0)) {
+ if ((uptr)&rl < end)
+ break;
+ prev_end = end;
+ }
+ CHECK((uptr)&rl >= start && (uptr)&rl < end);
+
+ // Get stacksize from rlimit, but clip it so that it does not overlap
+ // with other mappings.
+ uptr stacksize = rl.rlim_cur;
+ if (stacksize > end - prev_end)
+ stacksize = end - prev_end;
+ // When running with unlimited stack size, we still want to set some limit.
+ // The unlimited stack size is caused by 'ulimit -s unlimited'.
+ // Also, for some reason, GNU make spawns subprocesses with unlimited stack.
+ if (stacksize > kMaxThreadStackSize)
+ stacksize = kMaxThreadStackSize;
+ *stack_top = end;
+ *stack_bottom = end - stacksize;
+ return;
+ }
+ pthread_attr_t attr;
+ CHECK_EQ(pthread_getattr_np(pthread_self(), &attr), 0);
+ uptr stacksize = 0;
+ void *stackaddr = 0;
+ pthread_attr_getstack(&attr, &stackaddr, (size_t*)&stacksize);
+ pthread_attr_destroy(&attr);
+
+ *stack_top = (uptr)stackaddr + stacksize;
+ *stack_bottom = (uptr)stackaddr;
+ CHECK(stacksize < kMaxThreadStackSize); // Sanity check.
+}
+
+// Like getenv, but reads env directly from /proc and does not use libc.
+// This function should be called first inside __asan_init.
+extern "C" char **environ;
+const char *GetEnv(const char *name) {
+
+ uptr namelen = internal_strlen(name);
+ for (char **p = environ; *p; p++) {
+ if (!internal_memcmp(*p, name, namelen) && (*p)[namelen] == '=') // Match.
+ return *p + namelen + 1; // point after =
+ }
+ return 0; // Not found.
+}
+
+#ifdef __GLIBC__
+
+extern "C" {
+ extern void *__libc_stack_end;
+}
+
+static void GetArgsAndEnv(char ***argv, char ***envp) {
+ uptr *stack_end = (uptr *)__libc_stack_end;
+ int argc = *stack_end;
+ *argv = (char**)(stack_end + 1);
+ *envp = (char**)(stack_end + argc + 2);
+}
+
+#else // __GLIBC__
+
+static void ReadNullSepFileToArray(const char *path, char ***arr,
+ int arr_size) {
+ char *buff;
+ uptr buff_size = 0;
+ *arr = (char **)MmapOrDie(arr_size * sizeof(char *), "NullSepFileArray");
+ ReadFileToBuffer(path, &buff, &buff_size, 1024 * 1024);
+ (*arr)[0] = buff;
+ int count, i;
+ for (count = 1, i = 1; ; i++) {
+ if (buff[i] == 0) {
+ if (buff[i+1] == 0) break;
+ (*arr)[count] = &buff[i+1];
+ CHECK_LE(count, arr_size - 1); // FIXME: make this more flexible.
+ count++;
+ }
+ }
+ (*arr)[count] = 0;
+}
+
+static void GetArgsAndEnv(char ***argv, char ***envp) {
+ static const int kMaxArgv = 2000, kMaxEnvp = 2000;
+ ReadNullSepFileToArray("/proc/self/cmdline", argv, kMaxArgv);
+ ReadNullSepFileToArray("/proc/self/environ", envp, kMaxEnvp);
+}
+
+#endif // __GLIBC__
+
+void ReExec() {
+ char **argv, **envp;
+ GetArgsAndEnv(&argv, &envp);
+ execve("/proc/self/exe", argv, envp);
+ Printf("execve failed, errno %d\n", errno);
+ Die();
+}
+
+void PrepareForSandboxing() {
+ // Some kinds of sandboxes may forbid filesystem access, so we won't be able
+ // to read the file mappings from /proc/self/maps. Luckily, neither the
+ // process will be able to load additional libraries, so it's fine to use the
+ // cached mappings.
+ MemoryMappingLayout::CacheMemoryMappings();
+}
+
+// ----------------- sanitizer_procmaps.h
+// Linker initialized.
+ProcSelfMapsBuff MemoryMappingLayout::cached_proc_self_maps_;
+StaticSpinMutex MemoryMappingLayout::cache_lock_; // Linker initialized.
+
+MemoryMappingLayout::MemoryMappingLayout() {
+ proc_self_maps_.len =
+ ReadFileToBuffer("/proc/self/maps", &proc_self_maps_.data,
+ &proc_self_maps_.mmaped_size, 1 << 26);
+ if (proc_self_maps_.mmaped_size == 0) {
+ LoadFromCache();
+ CHECK_GT(proc_self_maps_.len, 0);
+ }
+ // internal_write(2, proc_self_maps_.data, proc_self_maps_.len);
+ Reset();
+ // FIXME: in the future we may want to cache the mappings on demand only.
+ CacheMemoryMappings();
+}
+
+MemoryMappingLayout::~MemoryMappingLayout() {
+ // Only unmap the buffer if it is different from the cached one. Otherwise
+ // it will be unmapped when the cache is refreshed.
+ if (proc_self_maps_.data != cached_proc_self_maps_.data) {
+ UnmapOrDie(proc_self_maps_.data, proc_self_maps_.mmaped_size);
+ }
+}
+
+void MemoryMappingLayout::Reset() {
+ current_ = proc_self_maps_.data;
+}
+
+// static
+void MemoryMappingLayout::CacheMemoryMappings() {
+ SpinMutexLock l(&cache_lock_);
+ // Don't invalidate the cache if the mappings are unavailable.
+ ProcSelfMapsBuff old_proc_self_maps;
+ old_proc_self_maps = cached_proc_self_maps_;
+ cached_proc_self_maps_.len =
+ ReadFileToBuffer("/proc/self/maps", &cached_proc_self_maps_.data,
+ &cached_proc_self_maps_.mmaped_size, 1 << 26);
+ if (cached_proc_self_maps_.mmaped_size == 0) {
+ cached_proc_self_maps_ = old_proc_self_maps;
+ } else {
+ if (old_proc_self_maps.mmaped_size) {
+ UnmapOrDie(old_proc_self_maps.data,
+ old_proc_self_maps.mmaped_size);
+ }
+ }
+}
+
+void MemoryMappingLayout::LoadFromCache() {
+ SpinMutexLock l(&cache_lock_);
+ if (cached_proc_self_maps_.data) {
+ proc_self_maps_ = cached_proc_self_maps_;
+ }
+}
+
+// Parse a hex value in str and update str.
+static uptr ParseHex(char **str) {
+ uptr x = 0;
+ char *s;
+ for (s = *str; ; s++) {
+ char c = *s;
+ uptr v = 0;
+ if (c >= '0' && c <= '9')
+ v = c - '0';
+ else if (c >= 'a' && c <= 'f')
+ v = c - 'a' + 10;
+ else if (c >= 'A' && c <= 'F')
+ v = c - 'A' + 10;
+ else
+ break;
+ x = x * 16 + v;
+ }
+ *str = s;
+ return x;
+}
+
+static bool IsOnOf(char c, char c1, char c2) {
+ return c == c1 || c == c2;
+}
+
+static bool IsDecimal(char c) {
+ return c >= '0' && c <= '9';
+}
+
+bool MemoryMappingLayout::Next(uptr *start, uptr *end, uptr *offset,
+ char filename[], uptr filename_size) {
+ char *last = proc_self_maps_.data + proc_self_maps_.len;
+ if (current_ >= last) return false;
+ uptr dummy;
+ if (!start) start = &dummy;
+ if (!end) end = &dummy;
+ if (!offset) offset = &dummy;
+ char *next_line = (char*)internal_memchr(current_, '\n', last - current_);
+ if (next_line == 0)
+ next_line = last;
+ // Example: 08048000-08056000 r-xp 00000000 03:0c 64593 /foo/bar
+ *start = ParseHex(¤t_);
+ CHECK_EQ(*current_++, '-');
+ *end = ParseHex(¤t_);
+ CHECK_EQ(*current_++, ' ');
+ CHECK(IsOnOf(*current_++, '-', 'r'));
+ CHECK(IsOnOf(*current_++, '-', 'w'));
+ CHECK(IsOnOf(*current_++, '-', 'x'));
+ CHECK(IsOnOf(*current_++, 's', 'p'));
+ CHECK_EQ(*current_++, ' ');
+ *offset = ParseHex(¤t_);
+ CHECK_EQ(*current_++, ' ');
+ ParseHex(¤t_);
+ CHECK_EQ(*current_++, ':');
+ ParseHex(¤t_);
+ CHECK_EQ(*current_++, ' ');
+ while (IsDecimal(*current_))
+ current_++;
+ CHECK_EQ(*current_++, ' ');
+ // Skip spaces.
+ while (current_ < next_line && *current_ == ' ')
+ current_++;
+ // Fill in the filename.
+ uptr i = 0;
+ while (current_ < next_line) {
+ if (filename && i < filename_size - 1)
+ filename[i++] = *current_;
+ current_++;
+ }
+ if (filename && i < filename_size)
+ filename[i] = 0;
+ current_ = next_line + 1;
+ return true;
+}
+
+// Gets the object name and the offset by walking MemoryMappingLayout.
+bool MemoryMappingLayout::GetObjectNameAndOffset(uptr addr, uptr *offset,
+ char filename[],
+ uptr filename_size) {
+ return IterateForObjectNameAndOffset(addr, offset, filename, filename_size);
+}
+
+bool SanitizerSetThreadName(const char *name) {
+ return 0 == pthread_setname_np(pthread_self(), "%s", (void *)(intptr_t)name);
+}
+
+bool SanitizerGetThreadName(char *name, int max_len) {
+ return 0 == pthread_getname_np(pthread_self(), name, max_len);
+}
+
+#ifndef SANITIZER_GO
+//------------------------- SlowUnwindStack -----------------------------------
+#ifdef __arm__
+#define UNWIND_STOP _URC_END_OF_STACK
+#define UNWIND_CONTINUE _URC_NO_REASON
+#else
+#ifndef _URC_NORMAL_STOP
+#define _URC_NORMAL_STOP 0
+#define _URC_NO_REASON 1
+#endif
+#define UNWIND_STOP _URC_NORMAL_STOP
+#define UNWIND_CONTINUE _URC_NO_REASON
+#endif
+
+uptr Unwind_GetIP(struct _Unwind_Context *ctx) {
+#ifdef __arm__
+ uptr val;
+ _Unwind_VRS_Result res = _Unwind_VRS_Get(ctx, _UVRSC_CORE,
+ 15 /* r15 = PC */, _UVRSD_UINT32, &val);
+ CHECK(res == _UVRSR_OK && "_Unwind_VRS_Get failed");
+ // Clear the Thumb bit.
+ return val & ~(uptr)1;
+#else
+ return (uptr)_Unwind_GetIP(ctx);
+#endif
+}
+
+_Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx, void *param) {
+ StackTrace *b = (StackTrace*)param;
+ CHECK(b->size < b->max_size);
+ uptr pc = Unwind_GetIP(ctx);
+ b->trace[b->size++] = pc;
+ if (b->size == b->max_size) return UNWIND_STOP;
+ return UNWIND_CONTINUE;
+}
+
+static bool MatchPc(uptr cur_pc, uptr trace_pc) {
+ return cur_pc - trace_pc <= 64 || trace_pc - cur_pc <= 64;
+}
+
+void StackTrace::SlowUnwindStack(uptr pc, uptr max_depth) {
+ this->size = 0;
+ this->max_size = max_depth;
+ if (max_depth > 1) {
+ _Unwind_Backtrace(Unwind_Trace, this);
+ // We need to pop a few frames so that pc is on top.
+ // trace[0] belongs to the current function so we always pop it.
+ int to_pop = 1;
+ /**/ if (size > 1 && MatchPc(pc, trace[1])) to_pop = 1;
+ else if (size > 2 && MatchPc(pc, trace[2])) to_pop = 2;
+ else if (size > 3 && MatchPc(pc, trace[3])) to_pop = 3;
+ else if (size > 4 && MatchPc(pc, trace[4])) to_pop = 4;
+ else if (size > 5 && MatchPc(pc, trace[5])) to_pop = 5;
+ this->PopStackFrames(to_pop);
+ }
+ this->trace[0] = pc;
+}
+
+#endif // #ifndef SANITIZER_GO
+
+enum MutexState {
+ MtxUnlocked = 0,
+ MtxLocked = 1,
+ MtxSleeping = 2
+};
+
+BlockingMutex::BlockingMutex(LinkerInitialized) {
+ CHECK_EQ(owner_, 0);
+}
+
+void BlockingMutex::Lock() {
+ atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
+ if (atomic_exchange(m, MtxLocked, memory_order_acquire) == MtxUnlocked)
+ return;
+ while (atomic_exchange(m, MtxSleeping, memory_order_acquire) != MtxUnlocked)
+ syscall(SYS_sched_yield);
+}
+
+void BlockingMutex::Unlock() {
+ atomic_uint32_t *m = reinterpret_cast<atomic_uint32_t *>(&opaque_storage_);
+ u32 v = atomic_exchange(m, MtxUnlocked, memory_order_relaxed);
+ CHECK_NE(v, MtxUnlocked);
+#if 0
+ if (v == MtxSleeping)
+ syscall(__NR_futex, m, FUTEX_WAKE, 1, 0, 0, 0);
+#endif
+}
+
+} // namespace __sanitizer
+
+#endif // __NetBSD__
