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// Copyright (c) 2012, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "vm/globals.h" // Needed here to get TARGET_ARCH_X64.
#if defined(TARGET_ARCH_X64)
#include "vm/assembler.h"
#include "vm/code_patcher.h"
#include "vm/cpu.h"
#include "vm/dart_entry.h"
#include "vm/instructions.h"
#include "vm/object.h"
#include "vm/raw_object.h"
namespace dart {
// The pattern of a Dart instance call is:
// 00: 48 bb imm64 mov RBX, immediate 1
// 10: 49 ba imm64 mov R10, immediate 2
// 20: 49 bb imm64 mov R11, target_address
// 30: 41 ff d3 call R11
// 33: <- return_address
class DartCallPattern : public ValueObject {
public:
explicit DartCallPattern(uword return_address)
: start_(return_address - kCallPatternSize) {
ASSERT(IsValid(return_address));
ASSERT((kCallPatternSize - 20) == Assembler::kCallExternalLabelSize);
}
static const int kCallPatternSize = 33;
static bool IsValid(uword return_address) {
uint8_t* code_bytes =
reinterpret_cast<uint8_t*>(return_address - kCallPatternSize);
return (code_bytes[00] == 0x48) && (code_bytes[01] == 0xBB) &&
(code_bytes[10] == 0x49) && (code_bytes[11] == 0xBA) &&
(code_bytes[20] == 0x49) && (code_bytes[21] == 0xBB) &&
(code_bytes[30] == 0x41) && (code_bytes[31] == 0xFF) &&
(code_bytes[32] == 0xD3);
}
uword target() const {
return *reinterpret_cast<uword*>(start_ + 20 + 2);
}
void set_target(uword target) const {
uword* target_addr = reinterpret_cast<uword*>(start_ + 20 + 2);
*target_addr = target;
CPU::FlushICache(start_ + 20, 2 + 8);
}
RawObject* immediate_one() const {
return *reinterpret_cast<RawObject**>(start_ + 0 + 2);
}
RawObject* immediate_two() const {
return *reinterpret_cast<RawObject**>(start_ + 10 + 2);
}
private:
uword start_;
DISALLOW_IMPLICIT_CONSTRUCTORS(DartCallPattern);
};
// A Dart instance call passes the ic-data in RBX.
// The expected pattern of a dart instance call:
// mov RBX, ic-data
// mov R10, arguments_descriptor_array
// mov R11, target_address
// call R11
// <- return address
class InstanceCall : public DartCallPattern {
public:
explicit InstanceCall(uword return_address)
: DartCallPattern(return_address) {}
RawObject* ic_data() const { return immediate_one(); }
RawObject* arguments_descriptor() const { return immediate_two(); }
private:
DISALLOW_IMPLICIT_CONSTRUCTORS(InstanceCall);
};
// The expected pattern of a dart static call:
// mov R10, arguments_descriptor_array (10 bytes) (optional in polym. calls)
// mov R11, target_address (10 bytes)
// call R11 (3 bytes)
// <- return address
class StaticCall : public ValueObject {
public:
explicit StaticCall(uword return_address)
: start_(return_address - kCallPatternSize) {
ASSERT(IsValid(return_address));
ASSERT(kCallPatternSize == Assembler::kCallExternalLabelSize);
}
static const int kCallPatternSize = 13;
static bool IsValid(uword return_address) {
uint8_t* code_bytes =
reinterpret_cast<uint8_t*>(return_address - kCallPatternSize);
return (code_bytes[00] == 0x49) && (code_bytes[01] == 0xBB) &&
(code_bytes[10] == 0x41) && (code_bytes[11] == 0xFF) &&
(code_bytes[12] == 0xD3);
}
uword target() const {
return *reinterpret_cast<uword*>(start_ + 2);
}
void set_target(uword target) const {
uword* target_addr = reinterpret_cast<uword*>(start_ + 2);
*target_addr = target;
CPU::FlushICache(start_, 2 + 8);
}
private:
uword start_;
DISALLOW_IMPLICIT_CONSTRUCTORS(StaticCall);
};
uword CodePatcher::GetStaticCallTargetAt(uword return_address,
const Code& code) {
ASSERT(code.ContainsInstructionAt(return_address));
StaticCall call(return_address);
return call.target();
}
void CodePatcher::PatchStaticCallAt(uword return_address,
const Code& code,
uword new_target) {
ASSERT(code.ContainsInstructionAt(return_address));
StaticCall call(return_address);
call.set_target(new_target);
}
void CodePatcher::PatchInstanceCallAt(uword return_address,
const Code& code,
uword new_target) {
ASSERT(code.ContainsInstructionAt(return_address));
InstanceCall call(return_address);
call.set_target(new_target);
}
uword CodePatcher::GetInstanceCallAt(uword return_address,
const Code& code,
ICData* ic_data,
Array* arguments_descriptor) {
ASSERT(code.ContainsInstructionAt(return_address));
InstanceCall call(return_address);
if (ic_data != NULL) {
*ic_data ^= call.ic_data();
}
if (arguments_descriptor != NULL) {
*arguments_descriptor ^= call.arguments_descriptor();
}
return call.target();
}
intptr_t CodePatcher::InstanceCallSizeInBytes() {
return DartCallPattern::kCallPatternSize;
}
void CodePatcher::InsertCallAt(uword start, uword target) {
*reinterpret_cast<uint8_t*>(start) = 0xE8;
ShortCallPattern call(start);
call.SetTargetAddress(target);
CPU::FlushICache(start, ShortCallPattern::InstructionLength());
}
} // namespace dart
#endif // defined TARGET_ARCH_X64