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// Copyright 2018 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.
#include "src/codegen/assembler-inl.h"
#include "src/codegen/macro-assembler-inl.h"
#include "src/execution/simulator.h"
#include "src/handles/handles-inl.h"
#include "src/wasm/code-space-access.h"
#include "test/cctest/cctest.h"
#include "test/common/assembler-tester.h"
namespace v8 {
namespace internal {
namespace test_icache {
using F0 = int(int);
#define __ masm.
static constexpr int kNumInstr = 100;
static constexpr int kNumIterations = 5;
static constexpr int kBufferSize = 8 * KB;
static void FloodWithInc(Isolate* isolate, TestingAssemblerBuffer* buffer) {
MacroAssembler masm(isolate, CodeObjectRequired::kYes, buffer->CreateView());
#if V8_TARGET_ARCH_IA32
__ mov(eax, Operand(esp, kSystemPointerSize));
for (int i = 0; i < kNumInstr; ++i) {
__ add(eax, Immediate(1));
}
#elif V8_TARGET_ARCH_X64
__ movl(rax, arg_reg_1);
for (int i = 0; i < kNumInstr; ++i) {
__ addl(rax, Immediate(1));
}
#elif V8_TARGET_ARCH_ARM64
__ CodeEntry();
for (int i = 0; i < kNumInstr; ++i) {
__ Add(x0, x0, Operand(1));
}
#elif V8_TARGET_ARCH_ARM
for (int i = 0; i < kNumInstr; ++i) {
__ add(r0, r0, Operand(1));
}
#elif V8_TARGET_ARCH_MIPS
__ mov(v0, a0);
for (int i = 0; i < kNumInstr; ++i) {
__ Addu(v0, v0, Operand(1));
}
#elif V8_TARGET_ARCH_MIPS64
__ mov(v0, a0);
for (int i = 0; i < kNumInstr; ++i) {
__ Addu(v0, v0, Operand(1));
}
#elif V8_TARGET_ARCH_PPC || V8_TARGET_ARCH_PPC64
for (int i = 0; i < kNumInstr; ++i) {
__ addi(r3, r3, Operand(1));
}
#elif V8_TARGET_ARCH_S390
for (int i = 0; i < kNumInstr; ++i) {
__ agfi(r2, Operand(1));
}
#elif V8_TARGET_ARCH_RISCV64
for (int i = 0; i < kNumInstr; ++i) {
__ Add32(a0, a0, Operand(1));
}
#else
#error Unsupported architecture
#endif
__ Ret();
CodeDesc desc;
masm.GetCode(isolate, &desc);
}
static void FloodWithNop(Isolate* isolate, TestingAssemblerBuffer* buffer) {
MacroAssembler masm(isolate, CodeObjectRequired::kYes, buffer->CreateView());
#if V8_TARGET_ARCH_IA32
__ mov(eax, Operand(esp, kSystemPointerSize));
#elif V8_TARGET_ARCH_X64
__ movl(rax, arg_reg_1);
#elif V8_TARGET_ARCH_ARM64
__ CodeEntry();
#elif V8_TARGET_ARCH_MIPS
__ mov(v0, a0);
#elif V8_TARGET_ARCH_MIPS64
__ mov(v0, a0);
#endif
for (int i = 0; i < kNumInstr; ++i) {
__ nop();
}
__ Ret();
CodeDesc desc;
masm.GetCode(isolate, &desc);
}
// Order of operation for this test case:
// exec -> perm(RW) -> patch -> flush -> perm(RX) -> exec
TEST(TestFlushICacheOfWritable) {
Isolate* isolate = CcTest::i_isolate();
HandleScope handles(isolate);
for (int i = 0; i < kNumIterations; ++i) {
auto buffer = AllocateAssemblerBuffer(kBufferSize);
// Allow calling the function from C++.
auto f = GeneratedCode<F0>::FromBuffer(isolate, buffer->start());
CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
buffer->size(), v8::PageAllocator::kReadWrite));
FloodWithInc(isolate, buffer.get());
FlushInstructionCache(buffer->start(), buffer->size());
CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
buffer->size(), v8::PageAllocator::kReadExecute));
CHECK_EQ(23 + kNumInstr, f.Call(23)); // Call into generated code.
CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
buffer->size(), v8::PageAllocator::kReadWrite));
FloodWithNop(isolate, buffer.get());
FlushInstructionCache(buffer->start(), buffer->size());
CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
buffer->size(), v8::PageAllocator::kReadExecute));
CHECK_EQ(23, f.Call(23)); // Call into generated code.
}
}
#if V8_TARGET_ARCH_ARM || V8_TARGET_ARCH_ARM64
// Note that this order of operations is not supported on ARM32/64 because on
// some older ARM32/64 kernels there is a bug which causes an access error on
// cache flush instructions to trigger access error on non-writable memory.
// See https://bugs.chromium.org/p/v8/issues/detail?id=8157
//
// Also note that this requires {kBufferSize == 8 * KB} to reproduce.
//
// The order of operations in V8 is akin to {TestFlushICacheOfWritable} above.
// It is hence OK to disable the below test on some architectures. Only the
// above test case should remain enabled on all architectures.
#define CONDITIONAL_TEST DISABLED_TEST
#else
#define CONDITIONAL_TEST TEST
#endif
// Order of operation for this test case:
// exec -> perm(RW) -> patch -> perm(RX) -> flush -> exec
CONDITIONAL_TEST(TestFlushICacheOfExecutable) {
Isolate* isolate = CcTest::i_isolate();
HandleScope handles(isolate);
for (int i = 0; i < kNumIterations; ++i) {
auto buffer = AllocateAssemblerBuffer(kBufferSize);
// Allow calling the function from C++.
auto f = GeneratedCode<F0>::FromBuffer(isolate, buffer->start());
CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
buffer->size(), v8::PageAllocator::kReadWrite));
FloodWithInc(isolate, buffer.get());
CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
buffer->size(), v8::PageAllocator::kReadExecute));
FlushInstructionCache(buffer->start(), buffer->size());
CHECK_EQ(23 + kNumInstr, f.Call(23)); // Call into generated code.
CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
buffer->size(), v8::PageAllocator::kReadWrite));
FloodWithNop(isolate, buffer.get());
CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
buffer->size(), v8::PageAllocator::kReadExecute));
FlushInstructionCache(buffer->start(), buffer->size());
CHECK_EQ(23, f.Call(23)); // Call into generated code.
}
}
#undef CONDITIONAL_TEST
// Order of operation for this test case:
// perm(RWX) -> exec -> patch -> flush -> exec
TEST(TestFlushICacheOfWritableAndExecutable) {
Isolate* isolate = CcTest::i_isolate();
HandleScope handles(isolate);
for (int i = 0; i < kNumIterations; ++i) {
auto buffer = AllocateAssemblerBuffer(kBufferSize, nullptr,
VirtualMemory::kMapAsJittable);
// Allow calling the function from C++.
auto f = GeneratedCode<F0>::FromBuffer(isolate, buffer->start());
CHECK(SetPermissions(GetPlatformPageAllocator(), buffer->start(),
buffer->size(), v8::PageAllocator::kReadWriteExecute));
SwitchMemoryPermissionsToWritable();
FloodWithInc(isolate, buffer.get());
FlushInstructionCache(buffer->start(), buffer->size());
SwitchMemoryPermissionsToExecutable();
CHECK_EQ(23 + kNumInstr, f.Call(23)); // Call into generated code.
SwitchMemoryPermissionsToWritable();
FloodWithNop(isolate, buffer.get());
FlushInstructionCache(buffer->start(), buffer->size());
SwitchMemoryPermissionsToExecutable();
CHECK_EQ(23, f.Call(23)); // Call into generated code.
}
}
#undef __
} // namespace test_icache
} // namespace internal
} // namespace v8
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