Rewrite non-temporal instructions

src/trusted/validator/validation_rewrite_64_test.cc

+/*
+ * Copyright 2015 The Native Client 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 <string.h>
+#include "gtest/gtest.h"
+
+#include "native_client/src/shared/platform/nacl_log.h"
+#include "native_client/src/shared/utils/types.h"
+#include "native_client/src/trusted/validator/ncvalidate.h"
+
+#define CODE_SIZE 32
+#define NOP 0x90
+
+class ValidationMovntRewriteTests : public ::testing::Test {
+ protected:
+  NaClValidationMetadata *metadata_ptr;
+  const struct NaClValidatorInterface *validator;
+  NaClCPUFeatures *cpu_features;
+
+  unsigned char code_buffer[CODE_SIZE];
+
+  void SetUp() {
+    metadata_ptr = NULL;
+    validator = NaClCreateValidator();
+    cpu_features = (NaClCPUFeatures *) malloc(validator->CPUFeatureSize);
+    EXPECT_NE(cpu_features, (NaClCPUFeatures *) NULL);
+    memset(cpu_features, 0, validator->CPUFeatureSize);
+    validator->SetAllCPUFeatures(cpu_features);
+    memset(code_buffer, NOP, sizeof(code_buffer));
+  }
+
+  NaClValidationStatus Validate(uint32_t flags) {
+    return validator->Validate(0, code_buffer, 32,
+                               FALSE,  /* stubout_mode */
+                               flags,
+                               FALSE,  /* readonly_test */
+                               cpu_features,
+                               metadata_ptr,
+                               NULL);
+  }
+
+  void TearDown() {
+    free(cpu_features);
+  }
+};
+
+TEST_F(ValidationMovntRewriteTests, DisableNonTemporalsNoRewrite) {
+  // mov %edi,%edi; movnti %rax,0x68(%r15,%rdi,1)
+  const char *code = "\x89\xff\x49\x0f\xc3\x44\x3f\x68";
+  memcpy(code_buffer, code, strlen(code));
+  NaClValidationStatus status = Validate(NACL_DISABLE_NONTEMPORALS_X86);
+  // Disable nontemporals, no rewrite.
+  EXPECT_EQ(NaClValidationFailed, status);
+  // Code should not change.
+  EXPECT_EQ(0, memcmp(code_buffer, code, strlen(code)));
+}
+
+TEST_F(ValidationMovntRewriteTests, RewritePrefetchnta) {
+  // mov %edi,%edi; prefetchnta (%r15,%rdi,1)
+  const char *code = "\x89\xff\x41\x0f\x18\x04\x3f";
+  memcpy(code_buffer, code, strlen(code));
+  NaClValidationStatus status = Validate(0);
+  EXPECT_EQ(NaClValidationSucceeded, status);
+  // mov %edi,%edi; nop; nop; nop; nop; nop
+  const char *expect_code = "\x89\xff\x90\x90\x90\x90\x90";
+  EXPECT_EQ(0, memcmp(code_buffer, expect_code, strlen(expect_code)));
+}
+
+TEST_F(ValidationMovntRewriteTests, RewriteMovntps) {
+  // mov %ebx,%ebx; movntps %xmm0,(%r15,%rbx,1)
+  const char *code = "\x89\xdb\x41\x0f\x2b\x04\x1f";
+  memcpy(code_buffer, code, strlen(code));
+  NaClValidationStatus status = Validate(0);
+  EXPECT_EQ(NaClValidationSucceeded, status);
+  // mov %ebx,%ebx; movaps %xmm0,(%r15,%rbx,1)
+  const char *expect_code = "\x89\xdb\x41\x0f\x29\x04\x1f";
+  EXPECT_EQ(0, memcmp(code_buffer, expect_code, strlen(expect_code)));
+}
+
+TEST_F(ValidationMovntRewriteTests, RewriteMovnti) {
+  // mov %edi,%edi; movnti %rax,0x68(%r15,%rdi,1)
+  const char *code = "\x89\xff\x49\x0f\xc3\x44\x3f\x68";
+  memcpy(code_buffer, code, strlen(code));
+  NaClValidationStatus status = Validate(0);
+  EXPECT_EQ(NaClValidationSucceeded, status);
+  // mov %edi,%edi; mov %rax,0x68(%r15,%rdi,1); nop
+  const char *expect_code = "\x89\xff\x49\x89\x44\x3f\x68\x90";

[bradn, 2015/08/04 22:03:30]

You can also put the expected asm in the .S file.

+  EXPECT_EQ(0, memcmp(code_buffer, expect_code, strlen(expect_code)));
+}
+
+TEST_F(ValidationMovntRewriteTests, RewriteMovnti2) {
+  // mov %edx,%edx; movnti %r9d,(%r15,%rdx,1)
+  const char *code = "\x89\xd2\x45\x0f\xc3\x0c\x17";
+  memcpy(code_buffer, code, strlen(code));
+  NaClValidationStatus status = Validate(0);
+  EXPECT_EQ(NaClValidationSucceeded, status);
+  // mov %edx,%edx; mov %r9d,(%r15,%rdx,1); nop
+  const char *expect_code = "\x89\xd2\x45\x89\x0c\x17\x90";
+  EXPECT_EQ(0, memcmp(code_buffer, expect_code, strlen(expect_code)));
+}
+
+TEST_F(ValidationMovntRewriteTests, RewriteMovntdq) {
+ // mov %edx,%edx; movntdq %xmm0,0x10(%r15,%rdx,1)
+  const char *code = "\x89\xd2\x66\x41\x0f\xe7\x44\x17\x10";
+  memcpy(code_buffer, code, strlen(code));
+  NaClValidationStatus status = Validate(0);
+  EXPECT_EQ(NaClValidationSucceeded, status);
+  // mov %edx,%edx; movdqa %xmm0,0x10(%r15,%rdx,1)
+  const char *expect_code = "\x89\xd2\x66\x41\x0f\x7f\x44\x17\x10";
+  EXPECT_EQ(0, memcmp(code_buffer, expect_code, strlen(expect_code)));
+}
+
+TEST_F(ValidationMovntRewriteTests, RewriteMovntdq2) {
+  // mov %ecx,%ecx; movntdq %xmm15,(%r15,%rcx,1)
+  const char *code = "\x89\xc9\x66\x45\x0f\xe7\x3c\x0f";
+  memcpy(code_buffer, code, strlen(code));
+  NaClValidationStatus status = Validate(0);
+  EXPECT_EQ(NaClValidationSucceeded, status);
+  // mov %ecx,%ecx; movdqa %xmm15,(%r15,%rcx,1)
+  const char *expect_code = "\x89\xc9\x66\x45\x0f\x7f\x3c\x0f";
+  EXPECT_EQ(0, memcmp(code_buffer, expect_code, strlen(expect_code)));
+}
+
+int main(int argc, char *argv[]) {
+  // The IllegalInst test touches the log mutex deep inside the validator.
+  // This causes an SEH exception to be thrown on Windows if the mutex is not
+  // initialized.
+  // http://code.google.com/p/nativeclient/issues/detail?id=1696
+  NaClLogModuleInit();
+  testing::InitGoogleTest(&argc, argv);
+  return RUN_ALL_TESTS();
+}