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// Copyright 2013 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_ARM64_FRAME_CONSTANTS_ARM64_H_
#define V8_EXECUTION_ARM64_FRAME_CONSTANTS_ARM64_H_
#include "src/base/bits.h"
#include "src/base/macros.h"
#include "src/codegen/arm64/register-arm64.h"
#include "src/codegen/register.h"
#include "src/codegen/reglist.h"
#include "src/common/globals.h"
#include "src/execution/frame-constants.h"
namespace v8 {
namespace internal {
// The layout of an EntryFrame is as follows:
//
// BOTTOM OF THE STACK HIGHEST ADDRESS
// slot Entry frame
// +---------------------+-----------------------
// -19 | saved register d15 |
// ... | ... |
// -12 | saved register d8 |
// |- - - - - - - - - - -|
// -11 | saved register x28 |
// ... | ... |
// -2 | saved register x19 |
// |- - - - - - - - - - -|
// -1 | saved lr (x30) |
// |- - - - - - - - - - -|
// 0 | saved fp (x29) | <-- frame ptr
// |- - - - - - - - - - -|
// 1 | stack frame marker |
// | (ENTRY) |
// |- - - - - - - - - - -|
// 2 | stack frame marker |
// | (0) |
// |- - - - - - - - - - -|
// 3 | C entry FP |
// |- - - - - - - - - - -|
// 4 | JS entry frame | <-- stack ptr
// | marker |
// -----+---------------------+-----------------------
// TOP OF THE STACK LOWEST 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;
static constexpr int kFixedFrameSize = 4 * kSystemPointerSize;
// The following constants are defined so we can static-assert their values
// near the relevant JSEntry assembly code, not because they're actually very
// useful.
static constexpr int kCalleeSavedRegisterBytesPushedBeforeFpLrPair =
18 * kSystemPointerSize;
static constexpr int kCalleeSavedRegisterBytesPushedAfterFpLrPair = 0;
static constexpr int kOffsetToCalleeSavedRegisters = 0;
// These offsets refer to the immediate caller (a native frame), not to the
// previous JS exit frame like kCallerFPOffset above.
static constexpr int kDirectCallerFPOffset =
kCalleeSavedRegisterBytesPushedAfterFpLrPair +
kOffsetToCalleeSavedRegisters;
static constexpr int kDirectCallerPCOffset =
kDirectCallerFPOffset + 1 * kSystemPointerSize;
static constexpr int kDirectCallerSPOffset =
kDirectCallerPCOffset + 1 * kSystemPointerSize +
kCalleeSavedRegisterBytesPushedBeforeFpLrPair;
};
class WasmCompileLazyFrameConstants : public TypedFrameConstants {
public:
static constexpr int kNumberOfSavedGpParamRegs = 8;
static constexpr int kNumberOfSavedFpParamRegs = 8;
// FP-relative.
// The instance is pushed as part of the saved registers. Being in {r7}, it is
// the first register pushed (highest register code in
// {wasm::kGpParamRegisters}). Because of padding of the frame header, it is
// actually one word further down the stack though (thus at position {1}).
static constexpr int kWasmInstanceOffset = TYPED_FRAME_PUSHED_VALUE_OFFSET(1);
static constexpr int kFixedFrameSizeFromFp =
// Header is padded to 16 byte (see {MacroAssembler::EnterFrame}).
RoundUp<16>(TypedFrameConstants::kFixedFrameSizeFromFp) +
kNumberOfSavedGpParamRegs * kSystemPointerSize +
kNumberOfSavedFpParamRegs * kSimd128Size;
};
// 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:
// x16: ip0, x17: ip1, x18: platform register, x26: root, x28: base, x29: fp,
// x30: lr, x31: xzr.
static constexpr RegList kPushedGpRegs = CPURegister::ListOf(
x0, x1, x2, x3, x4, x5, x6, x7, x8, x9, x10, x11, x12, x13, x14, x15, x19,
x20, x21, x22, x23, x24, x25, x27);
// We push FpRegs as 128-bit SIMD registers, so 16-byte frame alignment
// is guaranteed regardless of register count.
static constexpr RegList kPushedFpRegs = CPURegister::ListOf(
d0, d1, d2, d3, d4, d5, d6, d7, d8, d9, d10, d11, d12, d13, d14, d16, d17,
d18, d19, d20, d21, d22, d23, d24, d25, d26, d27, d28, d29);
static constexpr int kNumPushedGpRegisters =
base::bits::CountPopulation(kPushedGpRegs);
static_assert(kNumPushedGpRegisters % 2 == 0,
"stack frames need to be 16-byte aligned");
static constexpr int kNumPushedFpRegisters =
base::bits::CountPopulation(kPushedFpRegs);
static constexpr int kLastPushedGpRegisterOffset =
// Header is padded to 16 byte (see {MacroAssembler::EnterFrame}).
-RoundUp<16>(TypedFrameConstants::kFixedFrameSizeFromFp) -
kSystemPointerSize * kNumPushedGpRegisters;
static constexpr int kLastPushedFpRegisterOffset =
kLastPushedGpRegisterOffset - kSimd128Size * 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) * kSimd128Size;
}
};
} // namespace internal
} // namespace v8
#endif // V8_EXECUTION_ARM64_FRAME_CONSTANTS_ARM64_H_
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