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Unified Diff: src/x64/eh-frame-x64.cc

Issue 2023503002: Reland Implement .eh_frame writer and disassembler. (Closed) Base URL: https://chromium.googlesource.com/v8/v8.git@eh-frame-base
Patch Set: Rebase on master. Created 4 years, 5 months ago
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Index: src/x64/eh-frame-x64.cc
diff --git a/src/x64/eh-frame-x64.cc b/src/x64/eh-frame-x64.cc
new file mode 100644
index 0000000000000000000000000000000000000000..afbcf2167e67400a2db2b59bf6fe97b1864390d6
--- /dev/null
+++ b/src/x64/eh-frame-x64.cc
@@ -0,0 +1,63 @@
+// Copyright 2016 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "src/eh-frame.h"
+
+namespace v8 {
+namespace internal {
+
+static const int kRaxDwarfCode = 0;
+static const int kRbpDwarfCode = 6;
+static const int kRspDwarfCode = 7;
+static const int kRipDwarfCode = 16;
+
+const int EhFrameConstants::kCodeAlignmentFactor = 1;
+const int EhFrameConstants::kDataAlignmentFactor = -8;
+
+void EhFrameWriter::WriteReturnAddressRegisterCode() {
+ WriteULeb128(kRipDwarfCode);
+}
+
+void EhFrameWriter::WriteInitialStateInCie() {
+ SetBaseAddressRegisterAndOffset(rsp, kPointerSize);
+ // x64 rip (r16) has no Register instance associated.
+ RecordRegisterSavedToStack(kRipDwarfCode, -kPointerSize);
+}
+
+// static
+int EhFrameWriter::RegisterToDwarfCode(Register name) {
+ switch (name.code()) {
+ case Register::kCode_rbp:
+ return kRbpDwarfCode;
+ case Register::kCode_rsp:
+ return kRspDwarfCode;
+ case Register::kCode_rax:
+ return kRaxDwarfCode;
+ default:
+ UNIMPLEMENTED();
+ return -1;
+ }
+}
+
+#ifdef ENABLE_DISASSEMBLER
+
+// static
+const char* EhFrameDisassembler::DwarfRegisterCodeToString(int code) {
+ switch (code) {
+ case kRbpDwarfCode:
+ return "rbp";
+ case kRspDwarfCode:
+ return "rsp";
+ case kRipDwarfCode:
+ return "rip";
+ default:
+ UNIMPLEMENTED();
+ return nullptr;
+ }
+}
+
+#endif
+
+} // namespace internal
+} // namespace v8
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