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https://github.com/FEX-Emu/FEX.git
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Ryan Houdek
151e2279af
Reimagining of #3355 without any json generators or new concepts. Fixes some mislabeling of system calls. Some getting inlined when they shouldn't be, a lot not getting inlined when they can be. This really cleans up the syscall implementation, all syscalls that can be passthrough implementations require a very small two line declaration. Additionally cleans up a bit of implementation cruft where some passthrough syscalls were using the glibc syscall handler, and some were using the glibc implementation. We have had multiple issues in the past where the glibc implementation does something subtly different than the raw syscall and breaks things. Now all passthrough handlers do a system call directly, removing at least one indirection and some ambiguity. This makes it significantly easier to add new passthrough syscalls as well. Only need to do a version check and add the three lines per syscall. Which there are new syscalls incoming that we will want to add. Tangible improvements: - Syscalls are lower overhead than ever. - When I'm adding more syscalls I have less chance of mucking it up.
104 lines
3.6 KiB
C++
104 lines
3.6 KiB
C++
// SPDX-License-Identifier: MIT
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/*
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$info$
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tags: LinuxSyscalls|syscalls-x86-64
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$end_info$
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*/
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#include "LinuxSyscalls/Syscalls.h"
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#include "LinuxSyscalls/x64/Syscalls.h"
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#include "LinuxSyscalls/x64/SyscallsEnum.h"
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#include <FEXCore/HLE/SyscallHandler.h>
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namespace FEX::HLE::x64 {
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void RegisterEpoll(FEX::HLE::SyscallHandler *Handler);
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void RegisterFD(FEX::HLE::SyscallHandler *Handler);
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void RegisterInfo(FEX::HLE::SyscallHandler *Handler);
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void RegisterMemory(FEX::HLE::SyscallHandler *Handler);
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void RegisterSemaphore(FEX::HLE::SyscallHandler *Handler);
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void RegisterSignals(FEX::HLE::SyscallHandler *Handler);
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void RegisterThread(FEX::HLE::SyscallHandler *Handler);
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void RegisterTime(FEX::HLE::SyscallHandler *Handler);
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void RegisterNotImplemented(FEX::HLE::SyscallHandler *Handler);
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void RegisterPassthrough(FEX::HLE::SyscallHandler *Handler);
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x64SyscallHandler::x64SyscallHandler(FEXCore::Context::Context *ctx, FEX::HLE::SignalDelegator *_SignalDelegation)
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: SyscallHandler {ctx, _SignalDelegation} {
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OSABI = FEXCore::HLE::SyscallOSABI::OS_LINUX64;
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RegisterSyscallHandlers();
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}
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void x64SyscallHandler::RegisterSyscallHandlers() {
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auto cvt = [](auto in) {
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union {
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decltype(in) val;
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void *raw;
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} raw;
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raw.val = in;
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return raw.raw;
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};
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Definitions.resize(FEX::HLE::x64::SYSCALL_x64_MAX, SyscallFunctionDefinition {
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.NumArgs = 255,
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.Ptr = cvt(&UnimplementedSyscall),
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});
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FEX::HLE::RegisterEpoll(this);
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FEX::HLE::RegisterFD(this);
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FEX::HLE::RegisterFS(this);
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FEX::HLE::RegisterInfo(this);
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FEX::HLE::RegisterIO(this);
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FEX::HLE::RegisterMemory(this);
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FEX::HLE::RegisterSignals(this);
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FEX::HLE::RegisterThread(this);
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FEX::HLE::RegisterTimer(this);
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FEX::HLE::RegisterNotImplemented(this);
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FEX::HLE::RegisterStubs(this);
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// 64bit specific
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FEX::HLE::x64::RegisterEpoll(this);
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FEX::HLE::x64::RegisterFD(this);
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FEX::HLE::x64::RegisterInfo(this);
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FEX::HLE::x64::RegisterMemory(this);
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FEX::HLE::x64::RegisterSemaphore(this);
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FEX::HLE::x64::RegisterSignals(this);
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FEX::HLE::x64::RegisterThread(this);
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FEX::HLE::x64::RegisterTime(this);
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FEX::HLE::x64::RegisterNotImplemented(this);
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FEX::HLE::x64::RegisterPassthrough(this);
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// x86-64 has a gap of syscalls in the range of [335, 424) where there aren't any
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// These are defined that these must return -ENOSYS
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// This allows x86-64 to start using the common syscall numbers
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// Fill the gap to ensure that FEX doesn't assert
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constexpr int SYSCALL_GAP_BEGIN = 335;
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constexpr int SYSCALL_GAP_END = 424;
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for (int SyscallNumber = SYSCALL_GAP_BEGIN; SyscallNumber < SYSCALL_GAP_END; ++SyscallNumber) {
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auto &Def = Definitions.at(SyscallNumber);
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Def.Ptr = cvt(&UnimplementedSyscallSafe);
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Def.NumArgs = 0;
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Def.Flags = FEXCore::IR::SyscallFlags::DEFAULT;
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// This will allow our syscall optimization code to make this code more optimal
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// Unlikely to hit a hot path though
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Def.HostSyscallNumber = SYSCALL_DEF(MAX);
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#ifdef DEBUG_STRACE
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Def.StraceFmt = "Invalid";
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#endif
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}
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#if PRINT_MISSING_SYSCALLS
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for (auto &Syscall: SyscallNames) {
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if (Definitions[Syscall.first].Ptr == cvt(&UnimplementedSyscall)) {
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LogMan::Msg::DFmt("Unimplemented syscall: {}", Syscall.second);
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}
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}
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#endif
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}
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fextl::unique_ptr<FEX::HLE::SyscallHandler> CreateHandler(FEXCore::Context::Context *ctx, FEX::HLE::SignalDelegator *_SignalDelegation) {
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return fextl::make_unique<x64SyscallHandler>(ctx, _SignalDelegation);
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}
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}
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