upload android base code part3

android/art/compiler/linker/mips/relative_patcher_mips.cc

@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2016 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 "linker/mips/relative_patcher_mips.h"
+
+#include "compiled_method.h"
+
+namespace art {
+namespace linker {
+
+uint32_t MipsRelativePatcher::ReserveSpace(
+    uint32_t offset,
+    const CompiledMethod* compiled_method ATTRIBUTE_UNUSED,
+    MethodReference method_ref ATTRIBUTE_UNUSED) {
+  return offset;  // No space reserved; no limit on relative call distance.
+}
+
+uint32_t MipsRelativePatcher::ReserveSpaceEnd(uint32_t offset) {
+  return offset;  // No space reserved; no limit on relative call distance.
+}
+
+uint32_t MipsRelativePatcher::WriteThunks(OutputStream* out ATTRIBUTE_UNUSED, uint32_t offset) {
+  return offset;  // No thunks added; no limit on relative call distance.
+}
+
+void MipsRelativePatcher::PatchCall(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
+                                    uint32_t literal_offset ATTRIBUTE_UNUSED,
+                                    uint32_t patch_offset ATTRIBUTE_UNUSED,
+                                    uint32_t target_offset ATTRIBUTE_UNUSED) {
+  UNIMPLEMENTED(FATAL) << "PatchCall unimplemented on MIPS";
+}
+
+void MipsRelativePatcher::PatchPcRelativeReference(std::vector<uint8_t>* code,
+                                                   const LinkerPatch& patch,
+                                                   uint32_t patch_offset,
+                                                   uint32_t target_offset) {
+  uint32_t anchor_literal_offset = patch.PcInsnOffset();
+  uint32_t literal_offset = patch.LiteralOffset();
+  bool high_patch = ((*code)[literal_offset + 0] == 0x34) && ((*code)[literal_offset + 1] == 0x12);
+
+  // Perform basic sanity checks.
+  if (high_patch) {
+    if (is_r6) {
+      // auipc reg, offset_high
+      DCHECK_EQ(((*code)[literal_offset + 2] & 0x1F), 0x1E);
+      DCHECK_EQ(((*code)[literal_offset + 3] & 0xFC), 0xEC);
+    } else {
+      // lui reg, offset_high
+      DCHECK_EQ(((*code)[literal_offset + 2] & 0xE0), 0x00);
+      DCHECK_EQ((*code)[literal_offset + 3], 0x3C);
+      // addu reg, reg, reg2
+      DCHECK_EQ((*code)[literal_offset + 4], 0x21);
+      DCHECK_EQ(((*code)[literal_offset + 5] & 0x07), 0x00);
+      DCHECK_EQ(((*code)[literal_offset + 7] & 0xFC), 0x00);
+    }
+  } else {
+    // instr reg(s), offset_low
+    CHECK_EQ((*code)[literal_offset + 0], 0x78);
+    CHECK_EQ((*code)[literal_offset + 1], 0x56);
+  }
+
+  // Apply patch.
+  uint32_t anchor_offset = patch_offset - literal_offset + anchor_literal_offset;
+  uint32_t diff = target_offset - anchor_offset;
+  diff += (diff & 0x8000) << 1;  // Account for sign extension in "instr reg(s), offset_low".
+
+  if (high_patch) {
+    // lui reg, offset_high / auipc reg, offset_high
+    (*code)[literal_offset + 0] = static_cast<uint8_t>(diff >> 16);
+    (*code)[literal_offset + 1] = static_cast<uint8_t>(diff >> 24);
+  } else {
+    // instr reg(s), offset_low
+    (*code)[literal_offset + 0] = static_cast<uint8_t>(diff >> 0);
+    (*code)[literal_offset + 1] = static_cast<uint8_t>(diff >> 8);
+  }
+}
+
+void MipsRelativePatcher::PatchBakerReadBarrierBranch(std::vector<uint8_t>* code ATTRIBUTE_UNUSED,
+                                                      const LinkerPatch& patch ATTRIBUTE_UNUSED,
+                                                      uint32_t patch_offset ATTRIBUTE_UNUSED) {
+  LOG(FATAL) << "UNIMPLEMENTED";
+}
+
+}  // namespace linker
+}  // namespace art