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// 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 TypedFrameConstants {
public:
static const int kSPOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(0);
static const int kCodeOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1);
DEFINE_TYPED_FRAME_SIZES(2);
// 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::kFunctionOffset;
// 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_
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