314 lines
14 KiB
C#
314 lines
14 KiB
C#
// Copyright (C) 2026 SharpEmu Emulator Project
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// SPDX-License-Identifier: GPL-2.0-or-later
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using System;
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using System.Buffers.Binary;
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using System.Collections.Generic;
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using SharpEmu.HLE;
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using SharpEmu.Libs.Fiber;
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using Xunit;
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namespace SharpEmu.Libs.Tests.Fiber;
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/// <summary>
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/// Continuation contract for a job-system style fiber loop: two fibers that
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/// hand control back and forth many times from the same resume point. Each
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/// resume has to restore exactly the state its own suspension captured, so a
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/// stale or cross-fiber restore shows up here instead of as a null dereference
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/// inside guest code several switches later.
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/// </summary>
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[Collection(FiberStateCollection.Name)]
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public sealed class FiberSwitchLoopTests : IDisposable
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{
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private const ulong Base = 0x3_0000_0000UL;
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private const int RegionSize = 0x8000;
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private const ulong FiberA = Base + 0x0000;
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private const ulong FiberB = Base + 0x0100;
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private const ulong NameA = Base + 0x0300;
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private const ulong NameB = Base + 0x0340;
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private const ulong ArgSlotRoot = Base + 0x0380;
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private const ulong ArgSlotA = Base + 0x0388;
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private const ulong ArgSlotB = Base + 0x0390;
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private const ulong ContextA = Base + 0x1000;
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private const ulong ContextB = Base + 0x3000;
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private const ulong ContextSize = 0x1000;
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private const ulong EntryA = 0x4_0000_1000UL;
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private const ulong EntryB = 0x4_0000_2000UL;
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private const ulong ArgOnInitializeA = 0xA11AUL;
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private const ulong ArgOnInitializeB = 0xB22BUL;
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// The guest side of a job worker calls sceFiberSwitch from one place, so
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// every suspension of a given fiber reports the same return address and the
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// same resume stack. Only the payload registers differ between rounds.
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private const ulong ResumeRipA = 0x8_0084_1FD1UL;
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private const ulong ResumeRipB = 0x8_0084_1FD1UL;
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private const ulong ResumeRspA = 0x2_0858_FF10UL;
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private const ulong ResumeRspB = 0x2_085A_F3A0UL;
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private const ulong ReturnSlotA = ResumeRspA - 0x10UL;
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private const ulong ReturnSlotB = ResumeRspB - 0x10UL;
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private const ulong RootReturnRip = 0x8_0084_0000UL;
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private const ulong RootResumeRsp = 0x2_0850_0000UL;
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private const ulong RootReturnSlot = RootResumeRsp - 0x10UL;
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private const ulong ThreadHandle = 0x2E45_16AD_090UL;
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private const uint StateRun = 1;
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private const uint StateIdle = 2;
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private readonly IGuestThreadScheduler? _previousScheduler;
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private readonly ulong _previousThread;
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private readonly ulong _previousFiber;
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public FiberSwitchLoopTests()
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{
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FiberExports.ResetRuntimeState();
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_previousScheduler = GuestThreadExecution.Scheduler;
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GuestThreadExecution.Scheduler = new ContextTransferScheduler();
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_previousThread = GuestThreadExecution.EnterGuestThread(ThreadHandle);
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_previousFiber = GuestThreadExecution.EnterFiber(0);
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}
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public void Dispose()
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{
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GuestThreadExecution.EnterFiber(_previousFiber);
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GuestThreadExecution.RestoreGuestThread(_previousThread);
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GuestThreadExecution.Scheduler = _previousScheduler;
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FiberExports.ResetRuntimeState();
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}
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[Fact]
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public void RepeatedSwitch_RestoresEachFiberOwnResumePoint()
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{
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var memory = new FakeCpuMemory(Base, RegionSize);
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var context = new CpuContext(memory, Generation.Gen5);
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InitializeFiber(memory, context, FiberA, NameA, EntryA, ArgOnInitializeA, ContextA);
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InitializeFiber(memory, context, FiberB, NameB, EntryB, ArgOnInitializeB, ContextB);
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// The thread enters the fiber world through sceFiberRun.
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GuestThreadExecution.EnterImportCallFrame(RootReturnRip, RootResumeRsp, RootReturnSlot);
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context[CpuRegister.Rdi] = FiberA;
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context[CpuRegister.Rsi] = 0x1000UL;
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context[CpuRegister.Rdx] = ArgSlotRoot;
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Assert.Equal(0, FiberExports.FiberRun(context));
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Assert.True(GuestThreadExecution.TryConsumeCurrentContextTransfer(out var toA));
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Assert.Equal(EntryA, toA.Rip);
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Assert.Equal(ArgOnInitializeA, toA.Rdi);
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Assert.Equal(0x1000UL, toA.Rsi);
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Assert.Equal(0UL, toA.Rax);
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Assert.Equal(FiberA, GuestThreadExecution.CurrentFiberAddress);
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Assert.Equal(StateRun, ReadUInt32(memory, FiberA + 4));
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// Round 0 suspends A for the first time and starts B at its entry point.
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var sentinelsA = Sentinels(0xA0);
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Switch(memory, context, from: FiberA, to: FiberB, ResumeRipA, ResumeRspA, ReturnSlotA,
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ArgSlotA, argOnRun: 0xB000UL, sentinelsA);
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Assert.True(GuestThreadExecution.TryConsumeCurrentContextTransfer(out var toB));
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Assert.Equal(EntryB, toB.Rip);
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Assert.Equal(ArgOnInitializeB, toB.Rdi);
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Assert.Equal(0xB000UL, toB.Rsi);
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var expectedA = new FiberExpectation(ResumeRipA, ResumeRspA, ReturnSlotA, sentinelsA);
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FiberExpectation? expectedB = null;
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// Eight full round trips over the same pair of resume points.
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for (var round = 1; round <= 8; round++)
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{
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var sentinelsB = Sentinels((ulong)round << 32 | 0xB0);
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var argToA = 0xA000UL + (ulong)round;
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Switch(memory, context, from: FiberB, to: FiberA, ResumeRipB, ResumeRspB, ReturnSlotB,
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ArgSlotB, argToA, sentinelsB);
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expectedB = new FiberExpectation(ResumeRipB, ResumeRspB, ReturnSlotB, sentinelsB);
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Assert.True(GuestThreadExecution.TryConsumeCurrentContextTransfer(out var resumedA));
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AssertResume(resumedA, expectedA, $"round {round}: fiber A");
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Assert.Equal(argToA, ReadUInt64(memory, ArgSlotA));
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Assert.Equal(StateRun, ReadUInt32(memory, FiberA + 4));
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Assert.Equal(StateIdle, ReadUInt32(memory, FiberB + 4));
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var nextSentinelsA = Sentinels((ulong)round << 32 | 0xA0);
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var argToB = 0xB000UL + (ulong)round;
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Switch(memory, context, from: FiberA, to: FiberB, ResumeRipA, ResumeRspA, ReturnSlotA,
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ArgSlotA, argToB, nextSentinelsA);
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expectedA = new FiberExpectation(ResumeRipA, ResumeRspA, ReturnSlotA, nextSentinelsA);
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Assert.True(GuestThreadExecution.TryConsumeCurrentContextTransfer(out var resumedB));
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AssertResume(resumedB, expectedB, $"round {round}: fiber B");
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Assert.Equal(argToB, ReadUInt64(memory, ArgSlotB));
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Assert.Equal(StateRun, ReadUInt32(memory, FiberB + 4));
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Assert.Equal(StateIdle, ReadUInt32(memory, FiberA + 4));
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}
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}
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[Fact]
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public void RepeatedSwitch_KeepsResumeStackInsideTheOwningFiberContext()
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{
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var memory = new FakeCpuMemory(Base, RegionSize);
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var context = new CpuContext(memory, Generation.Gen5);
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InitializeFiber(memory, context, FiberA, NameA, EntryA, ArgOnInitializeA, ContextA);
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InitializeFiber(memory, context, FiberB, NameB, EntryB, ArgOnInitializeB, ContextB);
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GuestThreadExecution.EnterImportCallFrame(RootReturnRip, RootResumeRsp, RootReturnSlot);
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context[CpuRegister.Rdi] = FiberA;
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context[CpuRegister.Rsi] = 0;
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context[CpuRegister.Rdx] = ArgSlotRoot;
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Assert.Equal(0, FiberExports.FiberRun(context));
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Assert.True(GuestThreadExecution.TryConsumeCurrentContextTransfer(out var toA));
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// A fresh fiber must start on its own context block, not on the stack of
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// the thread that ran it.
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Assert.InRange(toA.Rsp, ContextA, ContextA + ContextSize);
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Assert.InRange(toA.ReturnSlotAddress, ContextA, ContextA + ContextSize);
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Switch(memory, context, from: FiberA, to: FiberB, ResumeRipA, ResumeRspA, ReturnSlotA,
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ArgSlotA, argOnRun: 0, Sentinels(0xA0));
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Assert.True(GuestThreadExecution.TryConsumeCurrentContextTransfer(out var toB));
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Assert.InRange(toB.Rsp, ContextB, ContextB + ContextSize);
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Assert.InRange(toB.ReturnSlotAddress, ContextB, ContextB + ContextSize);
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Assert.NotEqual(toA.Rsp, toB.Rsp);
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}
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private static void Switch(
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FakeCpuMemory memory,
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CpuContext context,
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ulong from,
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ulong to,
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ulong resumeRip,
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ulong resumeRsp,
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ulong returnSlot,
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ulong argOnReturnAddress,
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ulong argOnRun,
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IReadOnlyDictionary<CpuRegister, ulong> sentinels)
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{
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Assert.Equal(from, GuestThreadExecution.CurrentFiberAddress);
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// The guest reaches sceFiberSwitch through the import trampoline, which
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// is what publishes the resume point for the calling fiber.
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GuestThreadExecution.EnterImportCallFrame(resumeRip, resumeRsp, returnSlot);
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foreach (var (register, value) in sentinels)
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{
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context[register] = value;
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}
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context[CpuRegister.Rdi] = to;
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context[CpuRegister.Rsi] = argOnRun;
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context[CpuRegister.Rdx] = argOnReturnAddress;
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Assert.Equal(0, FiberExports.FiberSwitch(context));
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Assert.Equal(to, GuestThreadExecution.CurrentFiberAddress);
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_ = memory;
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}
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private static void AssertResume(GuestCpuContinuation actual, FiberExpectation? expected, string because)
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{
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Assert.NotNull(expected);
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Assert.Equal(expected.Rip, actual.Rip);
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Assert.Equal(expected.Rsp, actual.Rsp);
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Assert.Equal(expected.ReturnSlotAddress, actual.ReturnSlotAddress);
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// sceFiberSwitch returns SCE_OK to the fiber it resumes.
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Assert.Equal(0UL, actual.Rax);
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foreach (var (register, value) in expected.Sentinels)
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{
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var restored = register switch
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{
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CpuRegister.Rbx => actual.Rbx,
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CpuRegister.Rbp => actual.Rbp,
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CpuRegister.R12 => actual.R12,
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CpuRegister.R13 => actual.R13,
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CpuRegister.R14 => actual.R14,
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CpuRegister.R15 => actual.R15,
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_ => throw new InvalidOperationException($"Unexpected sentinel register {register}."),
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};
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Assert.True(value == restored, $"{because}: {register} was 0x{restored:X16}, expected 0x{value:X16}.");
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}
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}
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private static IReadOnlyDictionary<CpuRegister, ulong> Sentinels(ulong seed) =>
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new Dictionary<CpuRegister, ulong>
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{
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[CpuRegister.Rbx] = 0x1111_0000_0000_0000UL | seed,
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[CpuRegister.Rbp] = 0x2222_0000_0000_0000UL | seed,
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[CpuRegister.R12] = 0x3333_0000_0000_0000UL | seed,
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[CpuRegister.R13] = 0x4444_0000_0000_0000UL | seed,
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[CpuRegister.R14] = 0x5555_0000_0000_0000UL | seed,
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[CpuRegister.R15] = 0x6666_0000_0000_0000UL | seed,
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};
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private static void InitializeFiber(
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FakeCpuMemory memory,
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CpuContext context,
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ulong fiber,
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ulong nameAddress,
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ulong entry,
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ulong argOnInitialize,
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ulong contextAddress)
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{
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memory.WriteCString(nameAddress, $"F{fiber:X}");
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context[CpuRegister.Rdi] = fiber;
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context[CpuRegister.Rsi] = nameAddress;
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context[CpuRegister.Rdx] = entry;
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context[CpuRegister.Rcx] = argOnInitialize;
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context[CpuRegister.R8] = contextAddress;
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context[CpuRegister.R9] = ContextSize;
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Assert.Equal(0, FiberExports.FiberInitialize(context));
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}
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private static uint ReadUInt32(FakeCpuMemory memory, ulong address)
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{
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Span<byte> buffer = stackalloc byte[sizeof(uint)];
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Assert.True(memory.TryRead(address, buffer));
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return BinaryPrimitives.ReadUInt32LittleEndian(buffer);
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}
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private static ulong ReadUInt64(FakeCpuMemory memory, ulong address)
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{
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Span<byte> buffer = stackalloc byte[sizeof(ulong)];
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Assert.True(memory.TryRead(address, buffer));
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return BinaryPrimitives.ReadUInt64LittleEndian(buffer);
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}
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private sealed record FiberExpectation(
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ulong Rip,
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ulong Rsp,
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ulong ReturnSlotAddress,
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IReadOnlyDictionary<CpuRegister, ulong> Sentinels);
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private sealed class ContextTransferScheduler : IGuestThreadScheduler
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{
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public bool SupportsGuestContextTransfer => true;
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public void RegisterGuestThreadContext(ulong threadHandle, CpuContext context) { }
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public bool TryStartThread(CpuContext creatorContext, GuestThreadStartRequest request, out string? error) => throw new NotSupportedException();
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public bool TryJoinThread(CpuContext callerContext, ulong threadHandle, out ulong returnValue, out string? error) => throw new NotSupportedException();
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public void Pump(CpuContext callerContext, string reason) { }
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public int WakeBlockedThreads(string wakeKey, int maxCount = int.MaxValue) => 0;
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public bool HasPendingGuestExceptionForCurrentThread() => false;
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public bool TrySetGuestThreadPriority(ulong guestThreadHandle, int guestPriority) => throw new NotSupportedException();
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public bool TrySetGuestThreadAffinity(ulong guestThreadHandle, ulong affinityMask) => throw new NotSupportedException();
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public IReadOnlyList<GuestThreadSnapshot> SnapshotThreads() => Array.Empty<GuestThreadSnapshot>();
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public bool TryCallGuestFunction(CpuContext callerContext, ulong entryPoint, ulong arg0, ulong arg1,
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ulong stackAddress, ulong stackSize, string reason, out string? error) => throw new NotSupportedException();
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public bool TryCallGuestFunction(CpuContext callerContext, ulong entryPoint, ulong arg0, ulong arg1,
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ulong arg2, ulong stackAddress, ulong stackSize, string reason, out ulong returnValue,
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out string? error) => throw new NotSupportedException();
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public bool TryCallGuestFunction(CpuContext callerContext, ulong entryPoint, ulong arg0, ulong arg1,
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ulong arg2, ulong arg3, ulong stackAddress, ulong stackSize, string reason, out ulong returnValue,
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out string? error) => throw new NotSupportedException();
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public bool TryCallGuestContinuation(CpuContext callerContext, GuestCpuContinuation continuation, string reason,
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out string? error) => throw new NotSupportedException();
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public bool TryRaiseGuestException(CpuContext callerContext, ulong threadHandle, ulong handler, int exceptionType,
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out string? error) => throw new NotSupportedException();
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}
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}
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