Fixes for the profiler on arm64.

runtime/vm/signal_handler_linux.cc

Index: runtime/vm/signal_handler_linux.cc
===================================================================
--- runtime/vm/signal_handler_linux.cc	(revision 40496)
+++ runtime/vm/signal_handler_linux.cc	(working copy)
@@ -20,8 +20,12 @@
   pc = static_cast<uintptr_t>(mcontext.gregs[REG_EIP]);
 #elif defined(TARGET_ARCH_ARM) && defined(USING_SIMULATOR)
   pc = static_cast<uintptr_t>(mcontext.gregs[REG_EIP]);
+#elif defined(TARGET_ARCH_ARM64) && defined(USING_SIMULATOR)
+  pc = static_cast<uintptr_t>(mcontext.gregs[REG_RIP]);
 #elif defined(TARGET_ARCH_ARM)
   pc = static_cast<uintptr_t>(mcontext.arm_pc);
+#elif defined(TARGET_ARCH_ARM64)
+  pc = static_cast<uintptr_t>(mcontext.pc);
 #elif defined(TARGET_ARCH_MIPS)
   pc = static_cast<uintptr_t>(mcontext.pc);
 #else
@@ -42,8 +46,12 @@
   fp = static_cast<uintptr_t>(mcontext.gregs[REG_EBP]);
 #elif defined(TARGET_ARCH_ARM) && defined(USING_SIMULATOR)
   fp = static_cast<uintptr_t>(mcontext.gregs[REG_EBP]);
+#elif defined(TARGET_ARCH_ARM64) && defined(USING_SIMULATOR)
+  fp = static_cast<uintptr_t>(mcontext.gregs[REG_RBP]);
 #elif defined(TARGET_ARCH_ARM)
   fp = static_cast<uintptr_t>(mcontext.arm_fp);
+#elif defined(TARGET_ARCH_ARM64)
+  fp = static_cast<uintptr_t>(mcontext.regs[29]);
 #elif defined(TARGET_ARCH_MIPS)
   fp = static_cast<uintptr_t>(mcontext.gregs[30]);
 #else
@@ -54,7 +62,7 @@
 }
 
 
-uintptr_t SignalHandler::GetStackPointer(const mcontext_t& mcontext) {
+uintptr_t SignalHandler::GetCStackPointer(const mcontext_t& mcontext) {
   uintptr_t sp = 0;
 
 #if defined(TARGET_ARCH_IA32)
@@ -65,8 +73,12 @@
   sp = static_cast<uintptr_t>(mcontext.gregs[REG_ESP]);
 #elif defined(TARGET_ARCH_ARM) && defined(USING_SIMULATOR)
   sp = static_cast<uintptr_t>(mcontext.gregs[REG_ESP]);
+#elif defined(TARGET_ARCH_ARM64) && defined(USING_SIMULATOR)
+  sp = static_cast<uintptr_t>(mcontext.gregs[REG_RSP]);
 #elif defined(TARGET_ARCH_ARM)
   sp = static_cast<uintptr_t>(mcontext.arm_sp);
+#elif defined(TARGET_ARCH_ARM64)
+  sp = static_cast<uintptr_t>(mcontext.sp);
 #elif defined(TARGET_ARCH_MIPS)
   sp = static_cast<uintptr_t>(mcontext.gregs[29]);
 #else
@@ -76,6 +88,15 @@
 }
 
 
+uintptr_t SignalHandler::GetDartStackPointer(const mcontext_t& mcontext) {
+#if defined(TARGET_ARCH_ARM64) && !defined(USING_SIMULATOR)
+  return static_cast<uintptr_t>(mcontext.regs[18]);
+#else
+  return GetCStackPointer(mcontext);
+#endif
+}
+
+
 void SignalHandler::Install(SignalAction action) {
   struct sigaction act;
   act.sa_handler = NULL;