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// Copyright 2012 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_EXECUTION_ARM_FRAME_CONSTANTS_ARM_H_
#define V8_EXECUTION_ARM_FRAME_CONSTANTS_ARM_H_
#include "src/base/bits.h"
#include "src/base/macros.h"
#include "src/codegen/arm/register-arm.h"
#include "src/execution/frame-constants.h"
namespace v8 {
namespace internal {
// The layout of an EntryFrame is as follows:
// TOP OF THE STACK LOWEST ADDRESS
// +---------------------+-----------------------
// 0 | saved fp (r11) | <-- frame ptr
// |- - - - - - - - - - -|
// 1 | saved lr (r14) |
// |- - - - - - - - - - -|
// 2..3 | saved register d8 |
// ... | ... |
// 16..17 | saved register d15 |
// |- - - - - - - - - - -|
// 18 | saved register r4 |
// ... | ... |
// 24 | saved register r10 |
// -----+---------------------+-----------------------
// BOTTOM OF THE STACK HIGHEST ADDRESS
class EntryFrameConstants : public AllStatic {
public:
// This is the offset to where JSEntry pushes the current value of
// Isolate::c_entry_fp onto the stack.
static constexpr int kCallerFPOffset = -3 * kSystemPointerSize;
// Stack offsets for arguments passed to JSEntry.
static constexpr int kArgcOffset = +0 * kSystemPointerSize;
static constexpr int kArgvOffset = +1 * kSystemPointerSize;
// These offsets refer to the immediate caller (i.e a native frame).
static constexpr int kDirectCallerFPOffset = 0;
static constexpr int kDirectCallerPCOffset =
kDirectCallerFPOffset + 1 * kSystemPointerSize;
static constexpr int kDirectCallerGeneralRegistersOffset =
kDirectCallerPCOffset +
/* saved caller PC */
kSystemPointerSize +
/* d8...d15 */
kNumDoubleCalleeSaved * kDoubleSize;
static constexpr int kDirectCallerSPOffset =
kDirectCallerGeneralRegistersOffset +
/* r4...r10 (i.e. callee saved without fp) */
(kNumCalleeSaved - 1) * kSystemPointerSize;
};
class WasmCompileLazyFrameConstants : public TypedFrameConstants {
public:
static constexpr int kNumberOfSavedGpParamRegs = 4;
static constexpr int kNumberOfSavedFpParamRegs = 8;
// FP-relative.
// The instance is pushed as part of the saved registers. Being in {r3}, it is
// at position 1 in the list [r0, r2, r3, r6] (kGpParamRegisters sorted by
// number and indexed zero-based from the back).
static constexpr int kWasmInstanceOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1);
static constexpr int kFixedFrameSizeFromFp =
TypedFrameConstants::kFixedFrameSizeFromFp +
kNumberOfSavedGpParamRegs * kPointerSize +
kNumberOfSavedFpParamRegs * kDoubleSize;
};
// Frame constructed by the {WasmDebugBreak} builtin.
// After pushing the frame type marker, the builtin pushes all Liftoff cache
// registers (see liftoff-assembler-defs.h).
class WasmDebugBreakFrameConstants : public TypedFrameConstants {
public:
// r10: root, r11: fp, r12: ip, r13: sp, r14: lr, r15: pc.
static constexpr RegList kPushedGpRegs =
Register::ListOf(r0, r1, r2, r3, r4, r5, r6, r7, r8, r9);
// d13: zero, d14-d15: scratch
static constexpr RegList kPushedFpRegs = LowDwVfpRegister::ListOf(
d0, d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11, d12);
static constexpr int kNumPushedGpRegisters =
base::bits::CountPopulation(kPushedGpRegs);
static constexpr int kNumPushedFpRegisters =
base::bits::CountPopulation(kPushedFpRegs);
static constexpr int kLastPushedGpRegisterOffset =
-TypedFrameConstants::kFixedFrameSizeFromFp -
kSystemPointerSize * kNumPushedGpRegisters;
static constexpr int kLastPushedFpRegisterOffset =
kLastPushedGpRegisterOffset - kDoubleSize * kNumPushedFpRegisters;
// Offsets are fp-relative.
static int GetPushedGpRegisterOffset(int reg_code) {
DCHECK_NE(0, kPushedGpRegs & (1 << reg_code));
uint32_t lower_regs = kPushedGpRegs & ((uint32_t{1} << reg_code) - 1);
return kLastPushedGpRegisterOffset +
base::bits::CountPopulation(lower_regs) * kSystemPointerSize;
}
static int GetPushedFpRegisterOffset(int reg_code) {
DCHECK_NE(0, kPushedFpRegs & (1 << reg_code));
uint32_t lower_regs = kPushedFpRegs & ((uint32_t{1} << reg_code) - 1);
return kLastPushedFpRegisterOffset +
base::bits::CountPopulation(lower_regs) * kDoubleSize;
}
};
} // namespace internal
} // namespace v8
#endif // V8_EXECUTION_ARM_FRAME_CONSTANTS_ARM_H_
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