Import compiler-rt r172839.vendor/compiler-rt/compiler-rt-r172839

1 files changed, 51 insertions, 60 deletions

diff --git a/lib/asan/asan_linux.cc b/lib/asan/asan_linux.cc
index 9a3d6bdb15a6..845493de0956 100644
--- a/lib/asan/asan_linux.cc
+++ b/lib/asan/asan_linux.cc
@@ -15,8 +15,8 @@
 
 #include "asan_interceptors.h"
 #include "asan_internal.h"
-#include "asan_lock.h"
 #include "asan_thread.h"
+#include "asan_thread_registry.h"
 #include "sanitizer_common/sanitizer_libc.h"
 #include "sanitizer_common/sanitizer_procmaps.h"
 
@@ -31,7 +31,7 @@
 #include <unistd.h>
 #include <unwind.h>
 
-#ifndef ANDROID
+#if !ASAN_ANDROID
 // FIXME: where to get ucontext on Android?
 #include <sys/ucontext.h>
 #endif
@@ -40,13 +40,17 @@ extern "C" void* _DYNAMIC;
 
 namespace __asan {
 
+void MaybeReexec() {
+  // No need to re-exec on Linux.
+}
+
 void *AsanDoesNotSupportStaticLinkage() {
   // This will fail to link with -static.
   return &_DYNAMIC;  // defined in link.h
 }
 
 void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
-#ifdef ANDROID
+#if ASAN_ANDROID
   *pc = *sp = *bp = 0;
 #elif defined(__arm__)
   ucontext_t *ucontext = (ucontext_t*)context;
@@ -63,6 +67,27 @@ void GetPcSpBp(void *context, uptr *pc, uptr *sp, uptr *bp) {
   *pc = ucontext->uc_mcontext.gregs[REG_EIP];
   *bp = ucontext->uc_mcontext.gregs[REG_EBP];
   *sp = ucontext->uc_mcontext.gregs[REG_ESP];
+# elif defined(__powerpc__) || defined(__powerpc64__)
+  ucontext_t *ucontext = (ucontext_t*)context;
+  *pc = ucontext->uc_mcontext.regs->nip;
+  *sp = ucontext->uc_mcontext.regs->gpr[PT_R1];
+  // The powerpc{,64}-linux ABIs do not specify r31 as the frame
+  // pointer, but GCC always uses r31 when we need a frame pointer.
+  *bp = ucontext->uc_mcontext.regs->gpr[PT_R31];
+# elif defined(__sparc__)
+  ucontext_t *ucontext = (ucontext_t*)context;
+  uptr *stk_ptr;
+# if defined (__arch64__)
+  *pc = ucontext->uc_mcontext.mc_gregs[MC_PC];
+  *sp = ucontext->uc_mcontext.mc_gregs[MC_O6];
+  stk_ptr = (uptr *) (*sp + 2047);
+  *bp = stk_ptr[15];
+# else
+  *pc = ucontext->uc_mcontext.gregs[REG_PC];
+  *sp = ucontext->uc_mcontext.gregs[REG_O6];
+  stk_ptr = (uptr *) *sp;
+  *bp = stk_ptr[15];
+# endif
 #else
 # error "Unsupported arch"
 #endif
@@ -76,69 +101,35 @@ void AsanPlatformThreadInit() {
   // Nothing here for now.
 }
 
-AsanLock::AsanLock(LinkerInitialized) {
-  // We assume that pthread_mutex_t initialized to all zeroes is a valid
-  // unlocked mutex. We can not use PTHREAD_MUTEX_INITIALIZER as it triggers
-  // a gcc warning:
-  // extended initializer lists only available with -std=c++0x or -std=gnu++0x
-}
-
-void AsanLock::Lock() {
-  CHECK(sizeof(pthread_mutex_t) <= sizeof(opaque_storage_));
-  pthread_mutex_lock((pthread_mutex_t*)&opaque_storage_);
-  CHECK(!owner_);
-  owner_ = (uptr)pthread_self();
-}
-
-void AsanLock::Unlock() {
-  CHECK(owner_ == (uptr)pthread_self());
-  owner_ = 0;
-  pthread_mutex_unlock((pthread_mutex_t*)&opaque_storage_);
-}
-
-#ifdef __arm__
-#define UNWIND_STOP _URC_END_OF_STACK
-#define UNWIND_CONTINUE _URC_NO_REASON
-#else
-#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 _Unwind_GetIP(ctx);
+void GetStackTrace(StackTrace *stack, uptr max_s, uptr pc, uptr bp, bool fast) {
+#if defined(__arm__) || \
+    defined(__powerpc__) || defined(__powerpc64__) || \
+    defined(__sparc__)
+  fast = false;
 #endif
+  if (!fast)
+    return stack->SlowUnwindStack(pc, max_s);
+  stack->size = 0;
+  stack->trace[0] = pc;
+  if (max_s > 1) {
+    stack->max_size = max_s;
+    if (!asan_inited) return;
+    if (AsanThread *t = asanThreadRegistry().GetCurrent())
+      stack->FastUnwindStack(pc, bp, t->stack_top(), t->stack_bottom());
+  }
 }
 
-_Unwind_Reason_Code Unwind_Trace(struct _Unwind_Context *ctx,
-    void *param) {
-  AsanStackTrace *b = (AsanStackTrace*)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;
+#if !ASAN_ANDROID
+void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
+  ucontext_t *ucp = (ucontext_t*)context;
+  *stack = (uptr)ucp->uc_stack.ss_sp;
+  *ssize = ucp->uc_stack.ss_size;
 }
-
-void AsanStackTrace::GetStackTrace(uptr max_s, uptr pc, uptr bp) {
-  size = 0;
-  trace[0] = pc;
-  if ((max_s) > 1) {
-    max_size = max_s;
-#ifdef __arm__
-    _Unwind_Backtrace(Unwind_Trace, this);
 #else
-     FastUnwindStack(pc, bp);
-#endif
-  }
+void ReadContextStack(void *context, uptr *stack, uptr *ssize) {
+  UNIMPLEMENTED();
 }
+#endif
 
 }  // namespace __asan