S390: Initial impl of S390 asm, masm, code-stubs,...

src/s390/frames-s390.h

+// Copyright 2014 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.
+
+#ifndef V8_S390_FRAMES_S390_H_
+#define V8_S390_FRAMES_S390_H_
+
+namespace v8 {
+namespace internal {
+
+// Register list in load/store instructions
+// Note that the bit values must match those used in actual instruction encoding
+const int kNumRegs = 16;
+
+// Caller-saved/arguments registers
+const RegList kJSCallerSaved = 1 << 1 | 1 << 2 |  // r2  a1
+                               1 << 3 |           // r3  a2
+                               1 << 4 |           // r4  a3
+                               1 << 5;            // r5  a4
+
+const int kNumJSCallerSaved = 5;
+
+// Return the code of the n-th caller-saved register available to JavaScript
+// e.g. JSCallerSavedReg(0) returns r0.code() == 0
+int JSCallerSavedCode(int n);
+
+// Callee-saved registers preserved when switching from C to JavaScript
+const RegList kCalleeSaved =
+    1 << 6 |   // r6 (argument passing in CEntryStub)
+               //    (HandleScope logic in MacroAssembler)
+    1 << 7 |   // r7 (argument passing in CEntryStub)
+               //    (HandleScope logic in MacroAssembler)
+    1 << 8 |   // r8 (argument passing in CEntryStub)
+               //    (HandleScope logic in MacroAssembler)
+    1 << 9 |   // r9 (HandleScope logic in MacroAssembler)
+    1 << 10 |  // r10 (Roots register in Javascript)
+    1 << 11 |  // r11 (fp in Javascript)
+    1 << 12 |  // r12 (ip in Javascript)
+    1 << 13;   // r13 (cp in Javascript)
+// 1 << 15;   // r15 (sp in Javascript)
+
+const int kNumCalleeSaved = 8;
+
+#ifdef V8_TARGET_ARCH_S390X
+
+const RegList kCallerSavedDoubles = 1 << 0 |  // d0
+                                    1 << 1 |  // d1
+                                    1 << 2 |  // d2
+                                    1 << 3 |  // d3
+                                    1 << 4 |  // d4
+                                    1 << 5 |  // d5
+                                    1 << 6 |  // d6
+                                    1 << 7;   // d7
+
+const int kNumCallerSavedDoubles = 8;
+
+const RegList kCalleeSavedDoubles = 1 << 8 |   // d8
+                                    1 << 9 |   // d9
+                                    1 << 10 |  // d10
+                                    1 << 11 |  // d11
+                                    1 << 12 |  // d12
+                                    1 << 13 |  // d12
+                                    1 << 14 |  // d12
+                                    1 << 15;   // d13
+
+const int kNumCalleeSavedDoubles = 8;
+
+#else
+
+const RegList kCallerSavedDoubles = 1 << 14 |  // d14
+                                    1 << 15 |  // d15
+                                    1 << 0 |   // d0
+                                    1 << 1 |   // d1
+                                    1 << 2 |   // d2
+                                    1 << 3 |   // d3
+                                    1 << 5 |   // d5
+                                    1 << 7 |   // d7
+                                    1 << 8 |   // d8
+                                    1 << 9 |   // d9
+                                    1 << 10 |  // d10
+                                    1 << 11 |  // d10
+                                    1 << 12 |  // d10
+                                    1 << 13;   // d11
+
+const int kNumCallerSavedDoubles = 14;
+
+const RegList kCalleeSavedDoubles = 1 << 4 |  // d4
+                                    1 << 6;   // d6
+
+const int kNumCalleeSavedDoubles = 2;
+
+#endif
+
+// Number of registers for which space is reserved in safepoints. Must be a
+// multiple of 8.
+// TODO(regis): Only 8 registers may actually be sufficient. Revisit.
+const int kNumSafepointRegisters = 16;
+
+// Define the list of registers actually saved at safepoints.
+// Note that the number of saved registers may be smaller than the reserved
+// space, i.e. kNumSafepointSavedRegisters <= kNumSafepointRegisters.
+// const RegList kSafepointSavedRegisters = kJSCallerSaved | kCalleeSaved;
+// const int kNumSafepointSavedRegisters = kNumJSCallerSaved + kNumCalleeSaved;
+
+// The following constants describe the stack frame linkage area as
+// defined by the ABI.
+
+#if V8_TARGET_ARCH_S390X
+// [0] Back Chain
+// [1] Reserved for compiler use
+// [2] GPR 2
+// [3] GPR 3
+// ...
+// [15] GPR 15
+// [16] FPR 0
+// [17] FPR 2
+// [18] FPR 4
+// [19] FPR 6
+const int kNumRequiredStackFrameSlots = 20;
+const int kStackFrameRASlot = 14;
+const int kStackFrameSPSlot = 15;
+const int kStackFrameExtraParamSlot = 20;
+#else
+// [0] Back Chain
+// [1] Reserved for compiler use
+// [2] GPR 2
+// [3] GPR 3
+// ...
+// [15] GPR 15
+// [16..17] FPR 0
+// [18..19] FPR 2
+// [20..21] FPR 4
+// [22..23] FPR 6
+const int kNumRequiredStackFrameSlots = 24;
+const int kStackFrameRASlot = 14;
+const int kStackFrameSPSlot = 15;
+const int kStackFrameExtraParamSlot = 24;
+#endif
+
+// zLinux ABI requires caller frames to include sufficient space for
+// callee preserved register save area.
+#if V8_TARGET_ARCH_S390X
+const int kCalleeRegisterSaveAreaSize = 160;
+#elif V8_TARGET_ARCH_S390
+const int kCalleeRegisterSaveAreaSize = 96;
+#else
+const int kCalleeRegisterSaveAreaSize = 0;
+#endif
+
+// ----------------------------------------------------
+
+class EntryFrameConstants : public AllStatic {
+ public:
+  static const int kCallerFPOffset =
+      -(StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize);
+};
+
+class ExitFrameConstants : public AllStatic {
+ public:
+  static const int kFrameSize = 2 * kPointerSize;
+  static const int kConstantPoolOffset = 0;  // Not used.
+  static const int kCodeOffset = -2 * kPointerSize;
+  static const int kSPOffset = -1 * kPointerSize;
+
+  // The caller fields are below the frame pointer on the stack.
+  static const int kCallerFPOffset = 0 * kPointerSize;
+  // The calling JS function is below FP.
+  static const int kCallerPCOffset = 1 * kPointerSize;
+
+  // FP-relative displacement of the caller's SP.  It points just
+  // below the saved PC.
+  static const int kCallerSPDisplacement = 2 * kPointerSize;
+};
+
+class JavaScriptFrameConstants : public AllStatic {
+ public:
+  // FP-relative.
+  static const int kLocal0Offset = StandardFrameConstants::kExpressionsOffset;
+  static const int kLastParameterOffset = +2 * kPointerSize;
+  static const int kFunctionOffset = StandardFrameConstants::kMarkerOffset;
+
+  // Caller SP-relative.
+  static const int kParam0Offset = -2 * kPointerSize;
+  static const int kReceiverOffset = -1 * kPointerSize;
+};
+
+}  // namespace internal
+}  // namespace v8
+
+#endif  // V8_S390_FRAMES_S390_H_