1 files changed, 103 insertions, 0 deletions
diff --git a/runtime/arch/arm/context_arm.cc b/runtime/arch/arm/context_arm.cc
new file mode 100644
index 0000000..6b9538e
--- /dev/null
+++ b/runtime/arch/arm/context_arm.cc
@@ -0,0 +1,103 @@
+/*
+ * Copyright (C) 2011 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 "context_arm.h"
+
+#include "mirror/abstract_method.h"
+#include "mirror/object-inl.h"
+#include "stack.h"
+#include "thread.h"
+
+namespace art {
+namespace arm {
+
+static const uint32_t gZero = 0;
+
+void ArmContext::Reset() {
+  for (size_t i = 0; i < kNumberOfCoreRegisters; i++) {
+    gprs_[i] = NULL;
+  }
+  for (size_t i = 0; i < kNumberOfSRegisters; i++) {
+    fprs_[i] = NULL;
+  }
+  gprs_[SP] = &sp_;
+  gprs_[PC] = &pc_;
+  // Initialize registers with easy to spot debug values.
+  sp_ = ArmContext::kBadGprBase + SP;
+  pc_ = ArmContext::kBadGprBase + PC;
+}
+
+void ArmContext::FillCalleeSaves(const StackVisitor& fr) {
+  mirror::AbstractMethod* 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 < kNumberOfSRegisters; i++) {
+      if (((fp_core_spills >> i) & 1) != 0) {
+        fprs_[i] = fr.CalleeSaveAddress(spill_count + fp_spill_count - j, frame_size);
+        j++;
+      }
+    }
+  }
+}
+
+void ArmContext::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 ArmContext::SmashCallerSaves() {
+  // This needs to be 0 because we want a null/zero return value.
+  gprs_[R0] = const_cast<uint32_t*>(&gZero);
+  gprs_[R1] = const_cast<uint32_t*>(&gZero);
+  gprs_[R2] = NULL;
+  gprs_[R3] = NULL;
+}
+
+extern "C" void art_quick_do_long_jump(uint32_t*, uint32_t*);
+
+void ArmContext::DoLongJump() {
+  uintptr_t gprs[16];
+  uint32_t fprs[32];
+  for (size_t i = 0; i < kNumberOfCoreRegisters; ++i) {
+    gprs[i] = gprs_[i] != NULL ? *gprs_[i] : ArmContext::kBadGprBase + i;
+  }
+  for (size_t i = 0; i < kNumberOfSRegisters; ++i) {
+    fprs[i] = fprs_[i] != NULL ? *fprs_[i] : ArmContext::kBadGprBase + i;
+  }
+  DCHECK_EQ(reinterpret_cast<uintptr_t>(Thread::Current()), gprs[TR]);
+  art_quick_do_long_jump(gprs, fprs);
+}
+
+}  // namespace arm
+}  // namespace art