// 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_PPC_FRAMES_PPC_H_
#define V8_PPC_FRAMES_PPC_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 = 32;
// Caller-saved/arguments registers
const RegList kJSCallerSaved = 1 << 3 | // r3 a1
1 << 4 | // r4 a2
1 << 5 | // r5 a3
1 << 6 | // r6 a4
1 << 7 | // r7 a5
1 << 8 | // r8 a6
1 << 9 | // r9 a7
1 << 10 | // r10 a8
1 << 11;
const int kNumJSCallerSaved = 9;
// 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 << 14 | // r14
1 << 15 | // r15
1 << 16 | // r16
1 << 17 | // r17
1 << 18 | // r18
1 << 19 | // r19
1 << 20 | // r20
1 << 21 | // r21
1 << 22 | // r22
1 << 23 | // r23
1 << 24 | // r24
1 << 25 | // r25
1 << 26 | // r26
1 << 27 | // r27
1 << 28 | // r28
1 << 29 | // r29
1 << 30 | // r20
1 << 31; // r31
const int kNumCalleeSaved = 18;
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
1 << 8 | // d8
1 << 9 | // d9
1 << 10 | // d10
1 << 11 | // d11
1 << 12 | // d12
1 << 13; // d13
const int kNumCallerSavedDoubles = 14;
const RegList kCalleeSavedDoubles = 1 << 14 | // d14
1 << 15 | // d15
1 << 16 | // d16
1 << 17 | // d17
1 << 18 | // d18
1 << 19 | // d19
1 << 20 | // d20
1 << 21 | // d21
1 << 22 | // d22
1 << 23 | // d23
1 << 24 | // d24
1 << 25 | // d25
1 << 26 | // d26
1 << 27 | // d27
1 << 28 | // d28
1 << 29 | // d29
1 << 30 | // d30
1 << 31; // d31
const int kNumCalleeSavedDoubles = 18;
// Number of registers for which space is reserved in safepoints. Must be a
// multiple of 8.
const int kNumSafepointRegisters = 32;
// The following constants describe the stack frame linkage area as
// defined by the ABI. Note that kNumRequiredStackFrameSlots must
// satisfy alignment requirements (rounding up if required).
#if V8_TARGET_ARCH_PPC64 && V8_TARGET_LITTLE_ENDIAN
// [0] back chain
// [1] condition register save area
// [2] link register save area
// [3] TOC save area
// [4] Parameter1 save area
// ...
// [11] Parameter8 save area
// [12] Parameter9 slot (if necessary)
// ...
const int kNumRequiredStackFrameSlots = 12;
const int kStackFrameLRSlot = 2;
const int kStackFrameExtraParamSlot = 12;
#elif V8_OS_AIX || V8_TARGET_ARCH_PPC64
// [0] back chain
// [1] condition register save area
// [2] link register save area
// [3] reserved for compiler
// [4] reserved by binder
// [5] TOC save area
// [6] Parameter1 save area
// ...
// [13] Parameter8 save area
// [14] Parameter9 slot (if necessary)
// ...
#if V8_TARGET_ARCH_PPC64
const int kNumRequiredStackFrameSlots = 14;
#else
const int kNumRequiredStackFrameSlots = 16;
#endif
const int kStackFrameLRSlot = 2;
const int kStackFrameExtraParamSlot = 14;
#else
// [0] back chain
// [1] link register save area
// [2] Parameter9 slot (if necessary)
// ...
const int kNumRequiredStackFrameSlots = 4;
const int kStackFrameLRSlot = 1;
const int kStackFrameExtraParamSlot = 2;
#endif
// ----------------------------------------------------
class EntryFrameConstants : public AllStatic {
public:
static const int kCallerFPOffset =
-(StandardFrameConstants::kFixedFrameSizeFromFp + kPointerSize);
};
class ExitFrameConstants : public AllStatic {
public:
static const int kFrameSize =
FLAG_enable_embedded_constant_pool ? 3 * kPointerSize : 2 * kPointerSize;
static const int kConstantPoolOffset =
FLAG_enable_embedded_constant_pool ? -3 * kPointerSize : 0;
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_PPC_FRAMES_PPC_H_