AArch64: Add arm64 runtime support.

Adds support for arm64 to ART. Assembler stubs are sufficient for
down calls into interpreter. JNI compiler and generics are not finished.

Basic Generic JNI functionality.

Change-Id: I4a07c79d1e037b9f5746673480e32cf456867b82

1 files changed, 130 insertions, 0 deletions

diff --git a/runtime/arch/arm64/context_arm64.cc b/runtime/arch/arm64/context_arm64.cc
new file mode 100644
index 0000000000..3d63c36abe
--- /dev/null
+++ b/runtime/arch/arm64/context_arm64.cc
@@ -0,0 +1,130 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <stdint.h>
+
+#include "context_arm64.h"
+
+#include "mirror/art_method.h"
+#include "mirror/object-inl.h"
+#include "stack.h"
+#include "thread.h"
+
+
+namespace art {
+namespace arm64 {
+
+static const uint64_t gZero = 0;
+
+void Arm64Context::Reset() {
+  for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
+    gprs_[i] = NULL;
+  }
+  for (size_t i = 0; i < kNumberOfDRegisters; i++) {
+    fprs_[i] = NULL;
+  }
+  gprs_[SP] = &sp_;
+  gprs_[LR] = &pc_;
+  // Initialize registers with easy to spot debug values.
+  sp_ = Arm64Context::kBadGprBase + SP;
+  pc_ = Arm64Context::kBadGprBase + LR;
+}
+
+void Arm64Context::FillCalleeSaves(const StackVisitor& fr) {
+  mirror::ArtMethod* method = fr.GetMethod();
+  uint32_t core_spills = method->GetCoreSpillMask();
+  uint32_t fp_core_spills = method->GetFpSpillMask();
+  size_t spill_count = __builtin_popcount(core_spills);
+  size_t fp_spill_count = __builtin_popcount(fp_core_spills);
+  size_t frame_size = method->GetFrameSizeInBytes();
+
+  if (spill_count > 0) {
+    // Lowest number spill is farthest away, walk registers and fill into context.
+    int j = 1;
+    for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
+      if (((core_spills >> i) & 1) != 0) {
+        gprs_[i] = fr.CalleeSaveAddress(spill_count  - j, frame_size);
+        j++;
+      }
+    }
+  }
+
+  if (fp_spill_count > 0) {
+    // Lowest number spill is farthest away, walk registers and fill into context.
+    int j = 1;
+    for (size_t i = 0; i < kNumberOfDRegisters; i++) {
+      if (((fp_core_spills >> i) & 1) != 0) {
+        fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j, frame_size);
+        j++;
+      }
+    }
+  }
+}
+
+void Arm64Context::SetGPR(uint32_t reg, uintptr_t value) {
+  DCHECK_LT(reg, static_cast<uint32_t>(kNumberOfCoreRegisters));
+  DCHECK_NE(gprs_[reg], &gZero);  // Can't overwrite this static value since they are never reset.
+  DCHECK(gprs_[reg] != NULL);
+  *gprs_[reg] = value;
+}
+
+void Arm64Context::SmashCallerSaves() {
+  // This needs to be 0 because we want a null/zero return value.
+  gprs_[X0] = const_cast<uint64_t*>(&gZero);
+  gprs_[X1] = NULL;
+  gprs_[X2] = NULL;
+  gprs_[X3] = NULL;
+  gprs_[X4] = NULL;
+  gprs_[X5] = NULL;
+  gprs_[X6] = NULL;
+  gprs_[X7] = NULL;
+  gprs_[X8] = NULL;
+  gprs_[X9] = NULL;
+  gprs_[X10] = NULL;
+  gprs_[X11] = NULL;
+  gprs_[X12] = NULL;
+  gprs_[X13] = NULL;
+  gprs_[X14] = NULL;
+  gprs_[X15] = NULL;
+
+  fprs_[D8] = NULL;
+  fprs_[D9] = NULL;
+  fprs_[D10] = NULL;
+  fprs_[D11] = NULL;
+  fprs_[D12] = NULL;
+  fprs_[D13] = NULL;
+  fprs_[D14] = NULL;
+  fprs_[D15] = NULL;
+}
+
+extern "C" void art_quick_do_long_jump(uint64_t*, uint64_t*);
+
+void Arm64Context::DoLongJump() {
+  uint64_t gprs[32];
+  uint64_t fprs[32];
+
+  for (size_t i = 0; i < kNumberOfCoreRegisters; ++i) {
+    gprs[i] = gprs_[i] != NULL ? *gprs_[i] : Arm64Context::kBadGprBase + i;
+  }
+  for (size_t i = 0; i < kNumberOfDRegisters; ++i) {
+    fprs[i] = fprs_[i] != NULL ? *fprs_[i] : Arm64Context::kBadGprBase + i;
+  }
+  DCHECK_EQ(reinterpret_cast<uintptr_t>(Thread::Current()), gprs[TR]);
+  art_quick_do_long_jump(gprs, fprs);
+}
+
+}  // namespace arm64
+}  // namespace art