Merge pull request #9423 from MerryMage/arm64-movi2r-test

UnitTests: Add MOVI2R test

Source/Core/Common/Random.cpp

@@ -11,10 +11,42 @@
 
 namespace Common::Random
 {
-class CSPRNG final
+struct PRNG::Impl
+{
+  Impl(void* seed, std::size_t size)
+  {
+    mbedtls_hmac_drbg_init(&m_context);
+    const int ret = mbedtls_hmac_drbg_seed_buf(
+        &m_context, mbedtls_md_info_from_type(MBEDTLS_MD_SHA256), static_cast<u8*>(seed), size);
+    ASSERT(ret == 0);
+  }
+
+  ~Impl() { mbedtls_hmac_drbg_free(&m_context); }
+
+  void Generate(void* buffer, std::size_t size)
+  {
+    const int ret = mbedtls_hmac_drbg_random(&m_context, static_cast<u8*>(buffer), size);
+    ASSERT(ret == 0);
+  }
+
+  mbedtls_hmac_drbg_context m_context;
+};
+
+PRNG::PRNG(void* seed, std::size_t size) : m_impl(std::make_unique<Impl>(seed, size))
+{
+}
+
+PRNG::~PRNG() = default;
+
+void PRNG::Generate(void* buffer, std::size_t size)
+{
+  m_impl->Generate(buffer, size);
+}
+
+class EntropySeededPRNG final
 {
 public:
-  CSPRNG()
+  EntropySeededPRNG()
   {
     mbedtls_entropy_init(&m_entropy);
     mbedtls_hmac_drbg_init(&m_context);
@@ -23,7 +55,7 @@ class CSPRNG final
     ASSERT(ret == 0);
   }
 
-  ~CSPRNG()
+  ~EntropySeededPRNG()
   {
     mbedtls_hmac_drbg_free(&m_context);
     mbedtls_entropy_free(&m_entropy);
@@ -40,10 +72,10 @@ class CSPRNG final
   mbedtls_hmac_drbg_context m_context;
 };
 
-static thread_local CSPRNG s_csprng;
+static thread_local EntropySeededPRNG s_esprng;
 
 void Generate(void* buffer, std::size_t size)
 {
-  s_csprng.Generate(buffer, size);
+  s_esprng.Generate(buffer, size);
 }
 }  // namespace Common::Random

Source/Core/Common/Random.h

@@ -5,12 +5,37 @@
 #pragma once
 
 #include <cstddef>
+#include <memory>
 #include <type_traits>
 
 #include "Common/CommonTypes.h"
 
 namespace Common::Random
 {
+/// Cryptographically secure pseudo-random number generator, with explicit seed.
+class PRNG final
+{
+public:
+  explicit PRNG(u64 seed) : PRNG(&seed, sizeof(u64)) {}
+  PRNG(void* seed, std::size_t size);
+  ~PRNG();
+
+  void Generate(void* buffer, std::size_t size);
+
+  template <typename T>
+  T GenerateValue()
+  {
+    static_assert(std::is_arithmetic<T>(), "T must be an arithmetic type in GenerateValue.");
+    T value;
+    Generate(&value, sizeof(value));
+    return value;
+  }
+
+private:
+  struct Impl;
+  std::unique_ptr<Impl> m_impl;
+};
+
 /// Fill `buffer` with random bytes using a cryptographically secure pseudo-random number generator.
 void Generate(void* buffer, std::size_t size);
 

Source/UnitTests/Core/CMakeLists.txt

@@ -19,4 +19,8 @@ if(_M_X86)
     PowerPC/Jit64Common/ConvertDoubleToSingle.cpp
     PowerPC/Jit64Common/Frsqrte.cpp
   )
+elseif(_M_ARM_64)
+  add_dolphin_test(PowerPCTest
+    PowerPC/JitArm64/MovI2R.cpp
+  )
 endif()

Source/UnitTests/Core/PowerPC/JitArm64/MovI2R.cpp

@@ -0,0 +1,97 @@
+// Copyright 2021 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#include <cstddef>
+#include <type_traits>
+
+#include "Common/Arm64Emitter.h"
+#include "Common/Assert.h"
+#include "Common/BitUtils.h"
+#include "Common/Random.h"
+
+#include <gtest/gtest.h>
+
+namespace
+{
+using namespace Arm64Gen;
+
+class TestMovI2R : public ARM64CodeBlock
+{
+public:
+  TestMovI2R() { AllocCodeSpace(4096); }
+
+  void Check32(u32 value)
+  {
+    ResetCodePtr();
+
+    const u8* fn = GetCodePtr();
+    MOVI2R(W0, value);
+    RET();
+
+    FlushIcacheSection(const_cast<u8*>(fn), const_cast<u8*>(GetCodePtr()));
+
+    const u64 result = Common::BitCast<u64 (*)()>(fn)();
+    EXPECT_EQ(value, result);
+  }
+
+  void Check64(u64 value)
+  {
+    ResetCodePtr();
+
+    const u8* fn = GetCodePtr();
+    MOVI2R(X0, value);
+    RET();
+
+    FlushIcacheSection(const_cast<u8*>(fn), const_cast<u8*>(GetCodePtr()));
+
+    const u64 result = Common::BitCast<u64 (*)()>(fn)();
+    EXPECT_EQ(value, result);
+  }
+};
+
+}  // namespace
+
+TEST(JitArm64, MovI2R_32BitValues)
+{
+  Common::Random::PRNG rng{0};
+  TestMovI2R test;
+  for (u64 i = 0; i < 0x100000; i++)
+  {
+    const u32 value = rng.GenerateValue<u32>();
+    test.Check32(value);
+    test.Check64(value);
+  }
+}
+
+TEST(JitArm64, MovI2R_Rand)
+{
+  Common::Random::PRNG rng{0};
+  TestMovI2R test;
+  for (u64 i = 0; i < 0x100000; i++)
+  {
+    test.Check64(rng.GenerateValue<u64>());
+  }
+}
+
+TEST(JitArm64, MovI2R_ADP)
+{
+  TestMovI2R test;
+  const u64 base = Common::BitCast<u64>(test.GetCodePtr());
+  for (s64 i = -0x20000; i < 0x20000; i++)
+  {
+    const u64 offset = static_cast<u64>(i);
+    test.Check64(base + offset);
+  }
+}
+
+TEST(JitArm64, MovI2R_ADRP)
+{
+  TestMovI2R test;
+  const u64 base = Common::BitCast<u64>(test.GetCodePtr()) & ~0xFFF;
+  for (s64 i = -0x20000; i < 0x20000; i++)
+  {
+    const u64 offset = static_cast<u64>(i) << 12;
+    test.Check64(base + offset);
+  }
+}