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gem5/src/dev/reg_bank.test.cc
Gabe Black 9d1cc1bcc9 dev: Add an offset checking mechanism to RegisterBank. 
When adding a long list of registers, it can be easy to miss one which
will offset all the registers after it. It can be hard to find those
sorts of problems, and tedious and error prone to fix them.

This change adds a mechanism to simply annotate what offset a register
should have. That should also make the register list more self
documenting, since you'll be able to easily see what offset a register
has from the source without having to count up everything in front of it.

Change-Id: Ia7e419ffb062a64a10106305f875cec6f9fe9a80
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/66431
Reviewed-by: Yu-hsin Wang <yuhsingw@google.com>
Maintainer: Gabe Black <gabe.black@gmail.com>
Tested-by: kokoro <noreply+kokoro@google.com>
2022-12-06 13:27:33 +00:00

1349 lines
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/*
* Copyright (c) 2020 ARM Limited
* All rights reserved
*
* The license below extends only to copyright in the software and shall
* not be construed as granting a license to any other intellectual
* property including but not limited to intellectual property relating
* to a hardware implementation of the functionality of the software
* licensed hereunder. You may use the software subject to the license
* terms below provided that you ensure that this notice is replicated
* unmodified and in its entirety in all distributions of the software,
* modified or unmodified, in source code or in binary form.
*
* Copyright 2020 Google, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met: redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer;
* redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution;
* neither the name of the copyright holders nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma GCC diagnostic push
// __GNUC__ defined for both clang and gcc
// -Wdeprecated-copy has been added in clang10.0.0 and gcc9.0
#if defined(__GNUC__)
# if (defined(__clang__) && __GNUC__ >= 10) || \
(!defined(__clang__) && __GNUC__ >= 9)
# pragma GCC diagnostic ignored "-Wdeprecated-copy"
# endif
#endif
#include <gmock/gmock.h>
#include <gtest/gtest.h>
#pragma GCC diagnostic pop
#include <vector>
#include "base/gtest/logging.hh"
#include "dev/reg_bank.hh"
using namespace gem5;
// Compare the elements of an array against expected values.
using testing::ElementsAre;
// This version is needed with enough elements, empirically more than 10.
using testing::ElementsAreArray;
using testing::AllOf;
using testing::HasSubstr;
/*
* The RegisterRaz (read as zero) type.
*/
class RegisterRazTest : public testing::Test
{
protected:
static constexpr size_t BufSize = 12;
static constexpr size_t BufOffset = 4;
static constexpr size_t RazSize = 4;
std::array<uint8_t, BufSize> buf;
RegisterBankLE::RegisterRaz raz;
RegisterRazTest() : raz("raz", RazSize)
{
buf.fill(0xff);
}
};
// Needed by C++14 and lower
constexpr size_t RegisterRazTest::RazSize;
TEST_F(RegisterRazTest, Name)
{
EXPECT_EQ(raz.name(), "raz");
}
TEST_F(RegisterRazTest, Size)
{
EXPECT_EQ(raz.size(), RazSize);
}
// Accessing the entire register at once.
TEST_F(RegisterRazTest, FullAccess)
{
raz.write(buf.data() + BufOffset);
raz.read(buf.data() + BufOffset);
EXPECT_THAT(buf, ElementsAreArray({0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0x00,
0xff, 0xff, 0xff, 0xff}));
}
// Partial access, excluding the start of the register.
TEST_F(RegisterRazTest, PartialAccessHigh)
{
raz.write(buf.data() + BufOffset, 1, 3);
raz.read(buf.data() + BufOffset, 1, 3);
EXPECT_THAT(buf, ElementsAreArray({0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0xff,
0xff, 0xff, 0xff, 0xff}));
}
// Partial access, excluding the end of the register.
TEST_F(RegisterRazTest, PartialAccessLow)
{
raz.write(buf.data() + BufOffset, 0, 3);
raz.read(buf.data() + BufOffset, 0, 3);
EXPECT_THAT(buf, ElementsAreArray({0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0xff,
0xff, 0xff, 0xff, 0xff}));
}
// Partial access, excluding both ends of the register.
TEST_F(RegisterRazTest, PartialAccessMid)
{
raz.write(buf.data() + BufOffset, 1, 2);
raz.read(buf.data() + BufOffset, 1, 2);
EXPECT_THAT(buf, ElementsAreArray({0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff}));
}
TEST_F(RegisterRazTest, Serialize)
{
std::ostringstream os;
raz.serialize(os);
EXPECT_EQ(os.str(), "");
}
TEST_F(RegisterRazTest, Unserialize)
{
std::string s;
EXPECT_TRUE(raz.unserialize(s));
}
/*
* The RegisterRao (read as one) type.
*/
class RegisterRaoTest : public testing::Test
{
protected:
static constexpr size_t BufSize = 12;
static constexpr size_t BufOffset = 4;
static constexpr size_t RaoSize = 4;
std::array<uint8_t, BufSize> buf;
RegisterBankLE::RegisterRao rao;
RegisterRaoTest() : rao("rao", RaoSize)
{
buf.fill(0x00);
}
};
// Needed by C++14 and lower
constexpr size_t RegisterRaoTest::RaoSize;
TEST_F(RegisterRaoTest, Name)
{
EXPECT_EQ(rao.name(), "rao");
}
TEST_F(RegisterRaoTest, Size)
{
EXPECT_EQ(rao.size(), RaoSize);
}
// Accessing the entire register at once.
TEST_F(RegisterRaoTest, FullAccess)
{
rao.write(buf.data() + BufOffset);
rao.read(buf.data() + BufOffset);
EXPECT_THAT(buf, ElementsAreArray({0x00, 0x00, 0x00, 0x00,
0xff, 0xff, 0xff, 0xff,
0x00, 0x00, 0x00, 0x00}));
}
// Partial access, excluding the start of the register.
TEST_F(RegisterRaoTest, PartialAccessHigh)
{
rao.write(buf.data() + BufOffset, 1, 3);
rao.read(buf.data() + BufOffset, 1, 3);
EXPECT_THAT(buf, ElementsAreArray({0x00, 0x00, 0x00, 0x00,
0xff, 0xff, 0xff, 0x00,
0x00, 0x00, 0x00, 0x00}));
}
// Partial access, excluding the end of the register.
TEST_F(RegisterRaoTest, PartialAccessLow)
{
rao.write(buf.data() + BufOffset, 0, 3);
rao.read(buf.data() + BufOffset, 0, 3);
EXPECT_THAT(buf, ElementsAreArray({0x00, 0x00, 0x00, 0x00,
0xff, 0xff, 0xff, 0x00,
0x00, 0x00, 0x00, 0x00}));
}
// Partial access, excluding both ends of the register.
TEST_F(RegisterRaoTest, PartialAccessMid)
{
rao.write(buf.data() + BufOffset, 1, 2);
rao.read(buf.data() + BufOffset, 1, 2);
EXPECT_THAT(buf, ElementsAreArray({0x00, 0x00, 0x00, 0x00,
0xff, 0xff, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00}));
}
TEST_F(RegisterRaoTest, Serialize)
{
std::ostringstream os;
rao.serialize(os);
EXPECT_EQ(os.str(), "");
}
TEST_F(RegisterRaoTest, Unserialize)
{
std::string s;
EXPECT_TRUE(rao.unserialize(s));
}
/*
* The RegisterBuf type.
*/
class RegisterBufTest : public testing::Test
{
protected:
static constexpr size_t RegSize = 4;
std::array<uint8_t, RegSize * 3> buf;
std::array<uint8_t, RegSize * 3> backing;
RegisterBankLE::RegisterBuf reg;
public:
RegisterBufTest()
: buf{0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc},
backing{0x10, 0x20, 0x30, 0x40, 0x50, 0x60,
0x70, 0x80, 0x90, 0xa0, 0xb0, 0xc0},
reg("buf_reg", backing.data() + RegSize, RegSize)
{}
};
// Needed by C++14 and lower
constexpr size_t RegisterBufTest::RegSize;
TEST_F(RegisterBufTest, Name)
{
EXPECT_EQ(reg.name(), "buf_reg");
}
TEST_F(RegisterBufTest, Size)
{
EXPECT_EQ(reg.size(), RegSize);
}
// Read the entire register.
TEST_F(RegisterBufTest, FullRead)
{
reg.read(buf.data() + RegSize);
EXPECT_THAT(buf, ElementsAreArray({0x1, 0x2, 0x3, 0x4,
0x50, 0x60, 0x70, 0x80,
0x9, 0xa, 0xb, 0xc}));
EXPECT_THAT(backing, ElementsAreArray({0x10, 0x20, 0x30, 0x40,
0x50, 0x60, 0x70, 0x80,
0x90, 0xa0, 0xb0, 0xc0}));
}
// Write the entire register.
TEST_F(RegisterBufTest, FullWrite)
{
reg.write(buf.data() + RegSize);
EXPECT_THAT(buf, ElementsAreArray({0x1, 0x2, 0x3, 0x4,
0x5, 0x6, 0x7, 0x8,
0x9, 0xa, 0xb, 0xc}));
EXPECT_THAT(backing, ElementsAreArray({0x10, 0x20, 0x30, 0x40,
0x5, 0x6, 0x7, 0x8,
0x90, 0xa0, 0xb0, 0xc0}));
}
// Partial read, excluding the start of the register.
TEST_F(RegisterBufTest, PartialReadHigh)
{
reg.read(buf.data() + RegSize, 1, 3);
EXPECT_THAT(buf, ElementsAreArray({0x1, 0x2, 0x3, 0x4,
0x60, 0x70, 0x80, 0x8,
0x9, 0xa, 0xb, 0xc}));
EXPECT_THAT(backing, ElementsAreArray({0x10, 0x20, 0x30, 0x40,
0x50, 0x60, 0x70, 0x80,
0x90, 0xa0, 0xb0, 0xc0}));
}
// Partial write, excluding the start of the register.
TEST_F(RegisterBufTest, PartialWriteHigh)
{
reg.write(buf.data() + RegSize, 1, 3);
EXPECT_THAT(buf, ElementsAreArray({0x1, 0x2, 0x3, 0x4,
0x5, 0x6, 0x7, 0x8,
0x9, 0xa, 0xb, 0xc}));
EXPECT_THAT(backing, ElementsAreArray({0x10, 0x20, 0x30, 0x40,
0x50, 0x5, 0x6, 0x7,
0x90, 0xa0, 0xb0, 0xc0}));
}
// Partial read, excluding the end of the register.
TEST_F(RegisterBufTest, PartialReadLow)
{
reg.read(buf.data() + RegSize, 0, 3);
EXPECT_THAT(buf, ElementsAreArray({0x1, 0x2, 0x3, 0x4,
0x50, 0x60, 0x70, 0x8,
0x9, 0xa, 0xb, 0xc}));
EXPECT_THAT(backing, ElementsAreArray({0x10, 0x20, 0x30, 0x40,
0x50, 0x60, 0x70, 0x80,
0x90, 0xa0, 0xb0, 0xc0}));
}
// Partial write, excluding the end of the register.
TEST_F(RegisterBufTest, PartialWriteLow)
{
reg.write(buf.data() + RegSize, 0, 3);
EXPECT_THAT(buf, ElementsAreArray({0x1, 0x2, 0x3, 0x4,
0x5, 0x6, 0x7, 0x8,
0x9, 0xa, 0xb, 0xc}));
EXPECT_THAT(backing, ElementsAreArray({0x10, 0x20, 0x30, 0x40,
0x5, 0x6, 0x7, 0x80,
0x90, 0xa0, 0xb0, 0xc0}));
}
// Partial read, excluding both ends of the register.
TEST_F(RegisterBufTest, PartialReadMid)
{
reg.read(buf.data() + RegSize, 1, 2);
EXPECT_THAT(buf, ElementsAreArray({0x1, 0x2, 0x3, 0x4,
0x60, 0x70, 0x7, 0x8,
0x9, 0xa, 0xb, 0xc}));
EXPECT_THAT(backing, ElementsAreArray({0x10, 0x20, 0x30, 0x40,
0x50, 0x60, 0x70, 0x80,
0x90, 0xa0, 0xb0, 0xc0}));
}
// Partial write, excluding both ends of the register.
TEST_F(RegisterBufTest, PartialWriteMid)
{
reg.write(buf.data() + RegSize, 1, 2);
EXPECT_THAT(buf, ElementsAreArray({0x1, 0x2, 0x3, 0x4,
0x5, 0x6, 0x7, 0x8,
0x9, 0xa, 0xb, 0xc}));
EXPECT_THAT(backing, ElementsAreArray({0x10, 0x20, 0x30, 0x40,
0x50, 0x5, 0x6, 0x80,
0x90, 0xa0, 0xb0, 0xc0}));
}
TEST_F(RegisterBufTest, Serialize)
{
std::ostringstream os;
reg.serialize(os);
EXPECT_EQ(os.str(), "");
}
TEST_F(RegisterBufTest, Unserialize)
{
std::string s;
EXPECT_TRUE(reg.unserialize(s));
}
/*
* The RegisterLBuf type. Since it's so similar to RegisterBuf, just do a
* basic check that it's applying it's locally managed buffer to it's parent
* type.
*/
class RegisterLBufTest : public testing::Test
{
protected:
static constexpr size_t RegSize = 12;
RegisterBankLE::RegisterLBuf<12> reg;
std::array<uint8_t, 4> to_write;
public:
RegisterLBufTest() : reg("lbuf_reg"), to_write{0x1, 0x2, 0x3, 0x4}
{
reg.buffer.fill(0xff);
}
};
TEST_F(RegisterLBufTest, Name)
{
EXPECT_EQ(reg.name(), "lbuf_reg");
}
TEST_F(RegisterLBufTest, PartialWrite)
{
reg.write(to_write.data(), 4, 4);
EXPECT_THAT(reg.buffer, ElementsAreArray({0xff, 0xff, 0xff, 0xff,
0x1, 0x2, 0x3, 0x4,
0xff, 0xff, 0xff, 0xff}));
}
TEST_F(RegisterLBufTest, Serialize)
{
std::ostringstream os;
for (int i = 0; i < reg.buffer.size(); i++)
reg.buffer[i] = i;
reg.serialize(os);
EXPECT_EQ(os.str(), "0 1 2 3 4 5 6 7 8 9 10 11");
}
TEST_F(RegisterLBufTest, UnserializeSucess)
{
std::string s = "0 1 2 3 4 5 6 7 8 9 10 11";
EXPECT_TRUE(reg.unserialize(s));
EXPECT_THAT(reg.buffer, ElementsAreArray({0, 1, 2, 3, 4, 5,
6, 7, 8, 9, 10, 11}));
}
TEST_F(RegisterLBufTest, UnserializeFailure)
{
std::string s = "0 1 2 3 4 5 6 7 8 9 10";
EXPECT_FALSE(reg.unserialize(s));
EXPECT_THAT(reg.buffer, ElementsAreArray({0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff,
0xff, 0xff, 0xff, 0xff}));
}
/*
* The templated Register<> type which takes a backing type and endianness
* as template parameters.
*/
class TypedRegisterTest : public testing::Test
{
protected:
using BackingType = uint16_t;
static constexpr size_t RegSize = sizeof(BackingType);
// We'll typically test with the little endian version, since it only
// matters for a few methods.
RegisterBankLE::Register<BackingType> reg;
RegisterBankBE::Register<BackingType> regBE;
std::array<uint8_t, RegSize * 3> buf;
TypedRegisterTest() : reg("le_reg", 0x1122), regBE("be_reg", 0x1122),
buf{0x1, 0x2, 0x3, 0x4, 0x5, 0x6}
{}
};
// Needed by C++14 and lower
constexpr size_t TypedRegisterTest::RegSize;
TEST_F(TypedRegisterTest, DefaultConstructor)
{
RegisterBankLE::Register<uint32_t> def("def");
EXPECT_EQ(def.get(), 0);
}
TEST_F(TypedRegisterTest, Name)
{
EXPECT_EQ(reg.name(), "le_reg");
}
TEST_F(TypedRegisterTest, Size)
{
EXPECT_EQ(reg.size(), RegSize);
}
TEST_F(TypedRegisterTest, Writable)
{
// By default, all bits of the registers are writeable.
EXPECT_EQ(reg.writeable(), 0xffff);
}
// Verify that get returns the initial value of the reg.
TEST_F(TypedRegisterTest, GetInitial)
{
EXPECT_EQ(reg.get(), 0x1122);
}
TEST_F(TypedRegisterTest, Get)
{
reg.get() = 0x1020;
EXPECT_EQ(reg.get(), 0x1020);
reg.get() = 0x3040;
EXPECT_EQ(reg.get(), 0x3040);
}
// Do a full big endian read using the default read handler.
TEST_F(TypedRegisterTest, BigEndianDefaultFullRead)
{
regBE.read(buf.data() + RegSize);
EXPECT_EQ(regBE.get(), 0x1122);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x11, 0x22, 0x5, 0x6));
}
// Do a full big endian write using the default write handler.
TEST_F(TypedRegisterTest, BigEndianDefaultFullWrite)
{
regBE.write(buf.data() + RegSize);
EXPECT_EQ(regBE.get(), 0x0304);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x3, 0x4, 0x5, 0x6));
}
// Do a partial big endian read of the low half of the register.
TEST_F(TypedRegisterTest, BigEndianDefaultPartialReadLow)
{
regBE.read(buf.data() + RegSize, 0, 1);
EXPECT_EQ(regBE.get(), 0x1122);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x11, 0x4, 0x5, 0x6));
}
// Do a partial big endian read of the high half of the register.
TEST_F(TypedRegisterTest, BigEndianDefaultPartialReadHigh)
{
regBE.read(buf.data() + RegSize, 1, 1);
EXPECT_EQ(regBE.get(), 0x1122);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x22, 0x4, 0x5, 0x6));
}
// Do a partial big endian write of the low half of the register.
TEST_F(TypedRegisterTest, BigEndianDefaultPartialWriteLow)
{
regBE.write(buf.data() + RegSize, 0, 1);
EXPECT_EQ(regBE.get(), 0x0322);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x3, 0x4, 0x5, 0x6));
}
// Do a partial big endian write of the High half of the register.
TEST_F(TypedRegisterTest, BigEndianDefaultPartialWriteHigh)
{
regBE.write(buf.data() + RegSize, 1, 1);
EXPECT_EQ(regBE.get(), 0x1103);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x3, 0x4, 0x5, 0x6));
}
// Do a full little endian read using the default read handler.
TEST_F(TypedRegisterTest, LittleEndianDefaultFullRead)
{
reg.read(buf.data() + RegSize);
EXPECT_EQ(reg.get(), 0x1122);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x22, 0x11, 0x5, 0x6));
}
// Do a full little endian write using the default write handler.
TEST_F(TypedRegisterTest, LittleEndianDefaultFullWrite)
{
reg.write(buf.data() + RegSize);
EXPECT_EQ(reg.get(), 0x0403);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x3, 0x4, 0x5, 0x6));
}
// Do a partial little endian read of the low half of the register.
TEST_F(TypedRegisterTest, LittleEndianDefaultPartialReadLow)
{
reg.read(buf.data() + RegSize, 0, 1);
EXPECT_EQ(reg.get(), 0x1122);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x22, 0x4, 0x5, 0x6));
}
// Do a partial little endian read of the high half of the register.
TEST_F(TypedRegisterTest, LittleEndianDefaultPartialReadHigh)
{
reg.read(buf.data() + RegSize, 1, 1);
EXPECT_EQ(reg.get(), 0x1122);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x11, 0x4, 0x5, 0x6));
}
// Do a partial little endian write of the low half of the register.
TEST_F(TypedRegisterTest, LittleEndianDefaultPartialWriteLow)
{
reg.write(buf.data() + RegSize, 0, 1);
EXPECT_EQ(reg.get(), 0x1103);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x3, 0x4, 0x5, 0x6));
}
// Do a partial little endian write of the High half of the register.
TEST_F(TypedRegisterTest, LittleEndianDefaultPartialWriteHigh)
{
reg.write(buf.data() + RegSize, 1, 1);
EXPECT_EQ(reg.get(), 0x0322);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x3, 0x4, 0x5, 0x6));
}
// Set a mask for use on writes.
TEST_F(TypedRegisterTest, SetWriteable)
{
reg.writeable(0xff00);
reg.write(buf.data() + RegSize);
EXPECT_EQ(reg.get(), 0x0422);
regBE.writeable(0xff00);
regBE.write(buf.data() + RegSize);
EXPECT_EQ(regBE.get(), 0x0322);
}
// Make a register read only.
TEST_F(TypedRegisterTest, ReadOnly)
{
reg.readonly();
reg.write(buf.data() + RegSize);
EXPECT_EQ(reg.get(), 0x1122);
}
// Update a register with an explicit mask.
TEST_F(TypedRegisterTest, UpdateWithMask)
{
reg.update(0xeeee, 0x0ff0);
EXPECT_EQ(reg.get(), 0x1ee2);
}
// Update a register using the register's built in mask.
TEST_F(TypedRegisterTest, UpdateDefaultMask)
{
reg.writeable(0xf00f);
reg.update(0xeeee);
EXPECT_EQ(reg.get(), 0xe12e);
}
// Set a custom read handler for a register.
TEST_F(TypedRegisterTest, Reader)
{
RegisterBankLE::Register<BackingType> *reg_ptr = nullptr;
BackingType ret = 0x3344;
reg.reader([&reg_ptr, &ret](auto &r){
reg_ptr = &r;
return ret;
});
reg.read(buf.data() + RegSize);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x44, 0x33, 0x5, 0x6));
EXPECT_EQ(reg_ptr, &reg);
}
// Set a custom read handler for a register which is a class method.
TEST_F(TypedRegisterTest, ReaderMF)
{
using Reg = RegisterBankLE::Register<BackingType>;
struct ReadStruct
{
Reg *reg_ptr = nullptr;
BackingType ret = 0x3344;
BackingType
reader(Reg &r)
{
reg_ptr = &r;
return ret;
}
} read_struct;
reg.reader(&read_struct, &ReadStruct::reader);
reg.read(buf.data() + RegSize);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x44, 0x33, 0x5, 0x6));
EXPECT_EQ(read_struct.reg_ptr, &reg);
}
// Set a custom write handler for a register.
TEST_F(TypedRegisterTest, Writer)
{
RegisterBankLE::Register<BackingType> *reg_ptr = nullptr;
BackingType value = 0;
reg.writer([&reg_ptr, &value](auto &r, const BackingType &v) {
reg_ptr = &r;
value = v;
});
reg.write(buf.data() + RegSize);
EXPECT_EQ(reg_ptr, &reg);
EXPECT_EQ(value, 0x0403);
}
// Set a custom write handler for a register which is a class method.
TEST_F(TypedRegisterTest, WriterMF)
{
using Reg = RegisterBankLE::Register<BackingType>;
struct WriteStruct
{
Reg *reg_ptr = nullptr;
BackingType value = 0;
void
writer(Reg &r, const BackingType &v)
{
reg_ptr = &r;
value = v;
}
} write_struct;
reg.writer(&write_struct, &WriteStruct::writer);
reg.write(buf.data() + RegSize);
EXPECT_EQ(write_struct.reg_ptr, &reg);
EXPECT_THAT(write_struct.value, 0x0403);
}
// Set a custom partial read handler for a register.
TEST_F(TypedRegisterTest, PartialReader)
{
RegisterBankLE::Register<BackingType> *reg_ptr = nullptr;
int first = 0;
int last = 0;
BackingType ret = 0x3344;
reg.partialReader([&reg_ptr, &first, &last, ret](auto &r, int f, int l) {
reg_ptr = &r;
first = f;
last = l;
return ret;
});
reg.read(buf.data() + RegSize, 1, 1);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x33, 0x4, 0x5, 0x6));
EXPECT_EQ(reg_ptr, &reg);
EXPECT_EQ(first, 15);
EXPECT_EQ(last, 8);
}
// Set a custom partial read handler for a register which is a class method.
TEST_F(TypedRegisterTest, PartialReaderMF)
{
using Reg = RegisterBankLE::Register<BackingType>;
struct ReadStruct
{
Reg *reg_ptr = nullptr;
int first = 0;
int last = 0;
BackingType ret = 0x3344;
BackingType
reader(Reg &r, int f, int l)
{
reg_ptr = &r;
first = f;
last = l;
return ret;
}
} read_struct;
reg.partialReader(&read_struct, &ReadStruct::reader);
reg.read(buf.data() + RegSize, 1, 1);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x33, 0x4, 0x5, 0x6));
EXPECT_EQ(read_struct.reg_ptr, &reg);
EXPECT_EQ(read_struct.first, 15);
EXPECT_EQ(read_struct.last, 8);
}
// Set a custom partial write handler for a register.
TEST_F(TypedRegisterTest, PartialWriter)
{
RegisterBankLE::Register<BackingType> *reg_ptr = nullptr;
BackingType value = 0;
int first = 0;
int last = 0;
reg.partialWriter([&reg_ptr, &value, &first, &last](
auto &r, const BackingType &v, int f, int l) {
reg_ptr = &r;
value = v;
first = f;
last = l;
});
reg.write(buf.data() + RegSize, 1, 1);
EXPECT_EQ(reg_ptr, &reg);
EXPECT_EQ(value, 0x300);
EXPECT_EQ(first, 15);
EXPECT_EQ(last, 8);
}
// Set a custom partial write handler for a register which is a class method.
TEST_F(TypedRegisterTest, PartialWriterMF)
{
using Reg = RegisterBankLE::Register<BackingType>;
struct WriteStruct
{
Reg *reg_ptr = nullptr;
BackingType value = 0;
int first = 0;
int last = 0;
void
writer(Reg &r, const BackingType &v, int f, int l)
{
reg_ptr = &r;
value = v;
first = f;
last = l;
}
} write_struct;
reg.partialWriter(&write_struct, &WriteStruct::writer);
reg.write(buf.data() + RegSize, 1, 1);
EXPECT_EQ(write_struct.reg_ptr, &reg);
EXPECT_EQ(write_struct.value, 0x300);
EXPECT_EQ(write_struct.first, 15);
EXPECT_EQ(write_struct.last, 8);
}
// Default partial reader with a custom read handler.
TEST_F(TypedRegisterTest, PartialReaderReader)
{
RegisterBankLE::Register<BackingType> *reg_ptr = nullptr;
BackingType ret = 0x3344;
reg.reader([&reg_ptr, &ret](auto &r){
reg_ptr = &r;
return ret;
});
reg.read(buf.data() + RegSize, 1, 1);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x33, 0x4, 0x5, 0x6));
EXPECT_EQ(reg_ptr, &reg);
}
// Default partial writer with custome read and write handlers.
TEST_F(TypedRegisterTest, PartialWriterReaderWriter)
{
RegisterBankLE::Register<BackingType> *read_reg_ptr = nullptr;
BackingType read_ret = 0x3344;
RegisterBankLE::Register<BackingType> *write_reg_ptr = nullptr;
BackingType write_value = 0;
reg.reader([&read_reg_ptr, read_ret](auto &r){
read_reg_ptr = &r;
return read_ret;
}).writer([&write_reg_ptr, &write_value](auto &r, const BackingType &v) {
write_reg_ptr = &r;
write_value = v;
});
reg.write(buf.data() + RegSize, 1, 1);
EXPECT_THAT(buf, ElementsAre(0x1, 0x2, 0x3, 0x4, 0x5, 0x6));
EXPECT_EQ(read_reg_ptr, &reg);
EXPECT_EQ(write_reg_ptr, &reg);
EXPECT_EQ(write_value, 0x0344);
}
TEST_F(TypedRegisterTest, Serialize)
{
std::ostringstream os;
reg.serialize(os);
EXPECT_EQ(os.str(), "4386");
}
TEST_F(TypedRegisterTest, UnserializeSucess)
{
std::string s = "1234";
EXPECT_TRUE(reg.unserialize(s));
EXPECT_EQ(reg.get(), 1234);
}
TEST_F(TypedRegisterTest, UnserializeFailure)
{
std::string s = "not_a_number";
EXPECT_FALSE(reg.unserialize(s));
}
/*
* The RegisterBank itself.
*/
class RegisterBankTest : public testing::Test
{
protected:
class TestRegBank : public RegisterBankLE
{
public:
TestRegBank(const std::string &new_name, Addr new_base) :
RegisterBankLE(new_name, new_base)
{}
};
enum AccessType
{
Read,
Write,
PartialRead,
PartialWrite
};
struct Access
{
AccessType type;
uint32_t value = 0;
int first = 0;
int last = 0;
uint32_t ret = 0;
Access(AccessType _type) : type(_type) {}
Access(AccessType _type, uint32_t _value,
int _first, int _last, uint32_t _ret) :
type(_type), value(_value),
first(_first), last(_last), ret(_ret)
{}
bool
operator == (const Access &other) const
{
return type == other.type && value == other.value &&
first == other.first && last == other.last &&
ret == other.ret;
}
};
// A 32 bit register which keeps track of what happens to it.
class TestReg : public TestRegBank::Register32
{
public:
std::vector<Access> accesses;
TestReg(const std::string &new_name, uint32_t initial) :
TestRegBank::Register32(new_name, initial)
{
reader([this](auto &r) {
Access access(Read);
access.ret = defaultReader(r);
accesses.push_back(access);
return access.ret;
});
writer([this](auto &r, const uint32_t &v) {
Access access(Write);
access.value = v;
defaultWriter(r, v);
accesses.push_back(access);
});
partialReader([this](auto &r, int f, int l) {
Access access(PartialRead);
access.first = f;
access.last = l;
access.ret = defaultPartialReader(r, f, l);
accesses.push_back(access);
return access.ret;
});
partialWriter([this](auto &r, const uint32_t &v, int f, int l) {
Access access(PartialWrite);
access.value = v;
access.first = f;
access.last = l;
defaultPartialWriter(r, v, f, l);
accesses.push_back(access);
});
}
};
TestReg reg0, reg1, reg2;
TestRegBank emptyBank, fullBank;
std::array<uint8_t, 12> buf;
RegisterBankTest() :
reg0("reg0", 0xd3d2d1d0), reg1("reg1", 0xe3e2e1e0),
reg2("reg2", 0xf3f2f1f0),
emptyBank("empty", 0x12345), fullBank("full", 0x1000),
buf{0x11, 0x22, 0x33, 0x44, 0x55, 0x66,
0x77, 0x88, 0x99, 0xaa, 0xbb, 0xcc}
{
fullBank.addRegisters({reg0, reg1, reg2});
}
};
// Some basic accessors.
TEST_F(RegisterBankTest, Name)
{
EXPECT_EQ(emptyBank.name(), "empty");
EXPECT_EQ(fullBank.name(), "full");
}
TEST_F(RegisterBankTest, Base)
{
EXPECT_EQ(emptyBank.base(), 0x12345);
EXPECT_EQ(fullBank.base(), 0x1000);
}
// Adding registers, and the size accessor. With registers, size is boring.
TEST_F(RegisterBankTest, AddRegistersSize)
{
EXPECT_EQ(emptyBank.size(), 0);
emptyBank.addRegister(reg0);
EXPECT_EQ(emptyBank.size(), 4);
emptyBank.addRegisters({reg1, reg2});
EXPECT_EQ(emptyBank.size(), 12);
}
TEST_F(RegisterBankTest, AddRegistersWithOffsetChecks)
{
emptyBank.addRegister({0x12345});
EXPECT_EQ(emptyBank.size(), 0);
emptyBank.addRegister({0x12345, reg0});
EXPECT_EQ(emptyBank.size(), 4);
emptyBank.addRegister({0x12349});
EXPECT_EQ(emptyBank.size(), 4);
emptyBank.addRegisters({{0x12349, reg1}, {0x1234d}, {0x1234d, reg2}});
EXPECT_EQ(emptyBank.size(), 12);
}
TEST_F(RegisterBankTest, BadRegisterOffsetDeath)
{
gtestLogOutput.str("");
EXPECT_ANY_THROW(emptyBank.addRegisters({{0xabcd, reg0}, reg1}));
std::string actual = gtestLogOutput.str();
EXPECT_THAT(actual, HasSubstr("empty.reg0"));
EXPECT_THAT(actual, HasSubstr("to be 0xabcd"));
EXPECT_THAT(actual, HasSubstr("is 0x12345"));
}
TEST_F(RegisterBankTest, BadBankOffsetDeath)
{
gtestLogOutput.str("");
EXPECT_ANY_THROW(emptyBank.addRegisters({{0xabcd}, reg0}));
std::string actual = gtestLogOutput.str();
EXPECT_THAT(actual, HasSubstr("empty "));
EXPECT_THAT(actual, HasSubstr("to be 0xabcd"));
EXPECT_THAT(actual, HasSubstr("is 0x12345"));
}
// Reads.
TEST_F(RegisterBankTest, ReadOneAlignedFirst)
{
fullBank.read(0x1000, buf.data() + 4, 4);
EXPECT_THAT(buf, ElementsAreArray({0x11, 0x22, 0x33, 0x44,
0xd0, 0xd1, 0xd2, 0xd3,
0x99, 0xaa, 0xbb, 0xcc}));
EXPECT_THAT(reg0.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xd3d2d1d0)
));
EXPECT_TRUE(reg1.accesses.empty());
EXPECT_TRUE(reg2.accesses.empty());
}
TEST_F(RegisterBankTest, ReadOneAlignedMid)
{
fullBank.read(0x1004, buf.data() + 4, 4);
EXPECT_THAT(buf, ElementsAreArray({0x11, 0x22, 0x33, 0x44,
0xe0, 0xe1, 0xe2, 0xe3,
0x99, 0xaa, 0xbb, 0xcc}));
EXPECT_TRUE(reg0.accesses.empty());
EXPECT_THAT(reg1.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xe3e2e1e0)
));
EXPECT_TRUE(reg2.accesses.empty());
}
TEST_F(RegisterBankTest, ReadOneAlignedLast)
{
fullBank.read(0x1008, buf.data() + 4, 4);
EXPECT_THAT(buf, ElementsAreArray({0x11, 0x22, 0x33, 0x44,
0xf0, 0xf1, 0xf2, 0xf3,
0x99, 0xaa, 0xbb, 0xcc}));
EXPECT_TRUE(reg0.accesses.empty());
EXPECT_TRUE(reg1.accesses.empty());
EXPECT_THAT(reg2.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xf3f2f1f0)
));
}
TEST_F(RegisterBankTest, ReadTwoAligned)
{
fullBank.read(0x1004, buf.data() + 2, 8);
EXPECT_THAT(buf, ElementsAreArray({0x11, 0x22, 0xe0, 0xe1,
0xe2, 0xe3, 0xf0, 0xf1,
0xf2, 0xf3, 0xbb, 0xcc}));
EXPECT_TRUE(reg0.accesses.empty());
EXPECT_THAT(reg1.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xe3e2e1e0)
));
EXPECT_THAT(reg2.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xf3f2f1f0)
));
}
TEST_F(RegisterBankTest, ReadContained)
{
fullBank.read(0x1001, buf.data() + 4, 2);
EXPECT_THAT(buf, ElementsAreArray({0x11, 0x22, 0x33, 0x44,
0xd1, 0xd2, 0x77, 0x88,
0x99, 0xaa, 0xbb, 0xcc}));
EXPECT_THAT(reg0.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xd3d2d1d0),
Access(PartialRead, 0, 23, 8, 0x00d2d100)
));
EXPECT_TRUE(reg1.accesses.empty());
EXPECT_TRUE(reg2.accesses.empty());
}
TEST_F(RegisterBankTest, ReadOneSpanning)
{
fullBank.read(0x1002, buf.data() + 4, 4);
EXPECT_THAT(buf, ElementsAreArray({0x11, 0x22, 0x33, 0x44,
0xd2, 0xd3, 0xe0, 0xe1,
0x99, 0xaa, 0xbb, 0xcc}));
EXPECT_THAT(reg0.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xd3d2d1d0),
Access(PartialRead, 0, 31, 16, 0xd3d20000)
));
EXPECT_THAT(reg1.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xe3e2e1e0),
Access(PartialRead, 0, 15, 0, 0x0000e1e0)
));
EXPECT_TRUE(reg2.accesses.empty());
}
TEST_F(RegisterBankTest, ReadTwoSpanning)
{
fullBank.read(0x1002, buf.data() + 2, 8);
EXPECT_THAT(buf, ElementsAreArray({0x11, 0x22, 0xd2, 0xd3,
0xe0, 0xe1, 0xe2, 0xe3,
0xf0, 0xf1, 0xbb, 0xcc}));
EXPECT_THAT(reg0.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xd3d2d1d0),
Access(PartialRead, 0, 31, 16, 0xd3d20000)
));
EXPECT_THAT(reg1.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xe3e2e1e0)
));
EXPECT_THAT(reg2.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xf3f2f1f0),
Access(PartialRead, 0, 15, 0, 0x0000f1f0)
));
}
TEST_F(RegisterBankTest, ReadPartialFull)
{
fullBank.read(0x1002, buf.data() + 4, 6);
EXPECT_THAT(buf, ElementsAreArray({0x11, 0x22, 0x33, 0x44,
0xd2, 0xd3, 0xe0, 0xe1,
0xe2, 0xe3, 0xbb, 0xcc}));
EXPECT_THAT(reg0.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xd3d2d1d0),
Access(PartialRead, 0, 31, 16, 0xd3d20000)
));
EXPECT_THAT(reg1.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xe3e2e1e0)
));
EXPECT_TRUE(reg2.accesses.empty());
}
TEST_F(RegisterBankTest, ReadFullPartial)
{
fullBank.read(0x1004, buf.data() + 4, 6);
EXPECT_THAT(buf, ElementsAreArray({0x11, 0x22, 0x33, 0x44,
0xe0, 0xe1, 0xe2, 0xe3,
0xf0, 0xf1, 0xbb, 0xcc}));
EXPECT_TRUE(reg0.accesses.empty());
EXPECT_THAT(reg1.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xe3e2e1e0)
));
EXPECT_THAT(reg2.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xf3f2f1f0),
Access(PartialRead, 0, 15, 0, 0x0000f1f0)
));
}
TEST_F(RegisterBankTest, ReadLastPartial)
{
fullBank.read(0x100a, buf.data() + 4, 2);
EXPECT_THAT(buf, ElementsAreArray({0x11, 0x22, 0x33, 0x44,
0xf2, 0xf3, 0x77, 0x88,
0x99, 0xaa, 0xbb, 0xcc}));
EXPECT_TRUE(reg0.accesses.empty());
EXPECT_TRUE(reg1.accesses.empty());
EXPECT_THAT(reg2.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xf3f2f1f0),
Access(PartialRead, 0, 31, 16, 0xf3f20000)
));
}
// Write.
TEST_F(RegisterBankTest, WriteOneAlignedFirst)
{
fullBank.write(0x1000, buf.data() + 4, 4);
EXPECT_EQ(reg0.get(), 0x88776655);
EXPECT_EQ(reg1.get(), 0xe3e2e1e0);
EXPECT_EQ(reg2.get(), 0xf3f2f1f0);
EXPECT_THAT(reg0.accesses, ElementsAre(
Access(Write, 0x88776655, 0, 0, 0)
));
EXPECT_TRUE(reg1.accesses.empty());
EXPECT_TRUE(reg2.accesses.empty());
}
TEST_F(RegisterBankTest, WriteOneAlignedMid)
{
fullBank.write(0x1004, buf.data() + 4, 4);
EXPECT_EQ(reg0.get(), 0xd3d2d1d0);
EXPECT_EQ(reg1.get(), 0x88776655);
EXPECT_EQ(reg2.get(), 0xf3f2f1f0);
EXPECT_TRUE(reg0.accesses.empty());
EXPECT_THAT(reg1.accesses, ElementsAre(
Access(Write, 0x88776655, 0, 0, 0)
));
EXPECT_TRUE(reg2.accesses.empty());
}
TEST_F(RegisterBankTest, WriteOneAlignedLast)
{
fullBank.write(0x1008, buf.data() + 4, 4);
EXPECT_EQ(reg0.get(), 0xd3d2d1d0);
EXPECT_EQ(reg1.get(), 0xe3e2e1e0);
EXPECT_EQ(reg2.get(), 0x88776655);
EXPECT_TRUE(reg0.accesses.empty());
EXPECT_TRUE(reg1.accesses.empty());
EXPECT_THAT(reg2.accesses, ElementsAre(
Access(Write, 0x88776655, 0, 0, 0)
));
}
TEST_F(RegisterBankTest, WriteTwoAligned)
{
fullBank.write(0x1004, buf.data() + 2, 8);
EXPECT_EQ(reg0.get(), 0xd3d2d1d0);
EXPECT_EQ(reg1.get(), 0x66554433);
EXPECT_EQ(reg2.get(), 0xaa998877);
EXPECT_TRUE(reg0.accesses.empty());
EXPECT_THAT(reg1.accesses, ElementsAre(
Access(Write, 0x66554433, 0, 0, 0)
));
EXPECT_THAT(reg2.accesses, ElementsAre(
Access(Write, 0xaa998877, 0, 0, 0)
));
}
TEST_F(RegisterBankTest, WriteContained)
{
fullBank.write(0x1001, buf.data() + 4, 2);
EXPECT_EQ(reg0.get(), 0xd36655d0);
EXPECT_EQ(reg1.get(), 0xe3e2e1e0);
EXPECT_EQ(reg2.get(), 0xf3f2f1f0);
EXPECT_THAT(reg0.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xd3d2d1d0),
Access(Write, 0xd36655d0, 0, 0, 0),
Access(PartialWrite, 0x00665500, 23, 8, 0)
));
EXPECT_TRUE(reg1.accesses.empty());
EXPECT_TRUE(reg2.accesses.empty());
}
TEST_F(RegisterBankTest, WriteOneSpanning)
{
fullBank.write(0x1002, buf.data() + 4, 4);
EXPECT_EQ(reg0.get(), 0x6655d1d0);
EXPECT_EQ(reg1.get(), 0xe3e28877);
EXPECT_EQ(reg2.get(), 0xf3f2f1f0);
EXPECT_THAT(reg0.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xd3d2d1d0),
Access(Write, 0x6655d1d0, 0, 0, 0),
Access(PartialWrite, 0x66550000, 31, 16, 0)
));
EXPECT_THAT(reg1.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xe3e2e1e0),
Access(Write, 0xe3e28877, 0, 0, 0),
Access(PartialWrite, 0x00008877, 15, 0, 0)
));
EXPECT_TRUE(reg2.accesses.empty());
}
TEST_F(RegisterBankTest, WriteTwoSpanning)
{
fullBank.write(0x1002, buf.data() + 2, 8);
EXPECT_EQ(reg0.get(), 0x4433d1d0);
EXPECT_EQ(reg1.get(), 0x88776655);
EXPECT_EQ(reg2.get(), 0xf3f2aa99);
EXPECT_THAT(reg0.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xd3d2d1d0),
Access(Write, 0x4433d1d0, 0, 0, 0),
Access(PartialWrite, 0x44330000, 31, 16, 0)
));
EXPECT_THAT(reg1.accesses, ElementsAre(
Access(Write, 0x88776655, 0, 0, 0)
));
EXPECT_THAT(reg2.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xf3f2f1f0),
Access(Write, 0xf3f2aa99, 0, 0, 0),
Access(PartialWrite, 0x0000aa99, 15, 0, 0)
));
}
TEST_F(RegisterBankTest, WritePartialFull)
{
fullBank.write(0x1002, buf.data() + 4, 6);
EXPECT_EQ(reg0.get(), 0x6655d1d0);
EXPECT_EQ(reg1.get(), 0xaa998877);
EXPECT_EQ(reg2.get(), 0xf3f2f1f0);
EXPECT_THAT(reg0.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xd3d2d1d0),
Access(Write, 0x6655d1d0, 0, 0, 0),
Access(PartialWrite, 0x66550000, 31, 16, 0)
));
EXPECT_THAT(reg1.accesses, ElementsAre(
Access(Write, 0xaa998877, 0, 0, 0)
));
EXPECT_TRUE(reg2.accesses.empty());
}
TEST_F(RegisterBankTest, WriteFullPartial)
{
fullBank.write(0x1004, buf.data() + 4, 6);
EXPECT_EQ(reg0.get(), 0xd3d2d1d0);
EXPECT_EQ(reg1.get(), 0x88776655);
EXPECT_EQ(reg2.get(), 0xf3f2aa99);
EXPECT_TRUE(reg0.accesses.empty());
EXPECT_THAT(reg1.accesses, ElementsAre(
Access(Write, 0x88776655, 0, 0, 0)
));
EXPECT_THAT(reg2.accesses, ElementsAre(
Access(Read, 0, 0, 0, 0xf3f2f1f0),
Access(Write, 0xf3f2aa99, 0, 0, 0),
Access(PartialWrite, 0x0000aa99, 15, 0, 0)
));
}
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