mirror of
https://github.com/FEX-Emu/FEX.git
synced 2026-10-07 12:00:17 +02:00
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.
127 lines
4.0 KiB
C++
127 lines
4.0 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/SignalDelegator.h"
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#include "LinuxSyscalls/Syscalls.h"
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#include "LinuxSyscalls/x64/Syscalls.h"
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#include "LinuxSyscalls/x64/Thread.h"
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#include <FEXCore/Core/CoreState.h>
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#include <FEXCore/Debug/InternalThreadState.h>
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#include <FEXCore/HLE/Linux/ThreadManagement.h>
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#include <FEXCore/IR/IR.h>
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#include <FEXCore/fextl/vector.h>
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#include <sched.h>
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#include <signal.h>
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#include <stddef.h>
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#include <syscall.h>
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#include <stdint.h>
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#include <unistd.h>
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namespace FEX::HLE::x64 {
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uint64_t SetThreadArea(FEXCore::Core::CpuStateFrame *Frame, void *tls) {
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Frame->State.fs_cached = reinterpret_cast<uint64_t>(tls);
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return 0;
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}
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void AdjustRipForNewThread(FEXCore::Core::CpuStateFrame *Frame) {
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Frame->State.rip += 2;
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}
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void RegisterThread(FEX::HLE::SyscallHandler *Handler) {
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using namespace FEXCore::IR;
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REGISTER_SYSCALL_IMPL_X64_FLAGS(clone, SyscallFlags::DEFAULT,
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([](FEXCore::Core::CpuStateFrame *Frame, uint32_t flags, void *stack, pid_t *parent_tid, pid_t *child_tid, void *tls) -> uint64_t {
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FEX::HLE::clone3_args args {
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.Type = TypeOfClone::TYPE_CLONE2,
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.args = {
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.flags = flags, // CSIGNAL is contained in here
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.pidfd = 0, // For clone, pidfd is duplicated here
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.child_tid = reinterpret_cast<uint64_t>(child_tid),
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.parent_tid = reinterpret_cast<uint64_t>(parent_tid),
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.exit_signal = flags & CSIGNAL,
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.stack = reinterpret_cast<uint64_t>(stack),
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.stack_size = 0, // This syscall isn't able to see the stack size
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.tls = reinterpret_cast<uint64_t>(tls),
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.set_tid = 0, // This syscall isn't able to select TIDs
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.set_tid_size = 0,
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.cgroup = 0, // This syscall can't select cgroups
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},
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};
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return CloneHandler(Frame, &args);
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}));
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REGISTER_SYSCALL_IMPL_X64(sigaltstack, [](FEXCore::Core::CpuStateFrame *Frame, const stack_t *ss, stack_t *old_ss) -> uint64_t {
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return FEX::HLE::_SyscallHandler->GetSignalDelegator()->RegisterGuestSigAltStack(ss, old_ss);
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});
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// launch a new process under fex
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// currently does not propagate argv[0] correctly
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REGISTER_SYSCALL_IMPL_X64_FLAGS(execve, SyscallFlags::DEFAULT,
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[](FEXCore::Core::CpuStateFrame *Frame, const char *pathname, char *const argv[], char *const envp[]) -> uint64_t {
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fextl::vector<const char*> Args;
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fextl::vector<const char*> Envp;
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if (argv) {
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for (int i = 0; argv[i]; i++) {
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Args.push_back(argv[i]);
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}
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Args.push_back(nullptr);
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}
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if (envp) {
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for (int i = 0; envp[i]; i++) {
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Envp.push_back(envp[i]);
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}
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Envp.push_back(nullptr);
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}
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auto* const* ArgsPtr = argv ? const_cast<char* const*>(Args.data()) : nullptr;
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auto* const* EnvpPtr = envp ? const_cast<char* const*>(Envp.data()) : nullptr;
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FEX::HLE::ExecveAtArgs AtArgs = FEX::HLE::ExecveAtArgs::Empty();
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return FEX::HLE::ExecveHandler(pathname, ArgsPtr, EnvpPtr, AtArgs);
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});
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REGISTER_SYSCALL_IMPL_X64_FLAGS(execveat, SyscallFlags::DEFAULT,
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([](FEXCore::Core::CpuStateFrame *Frame, int dirfd, const char *pathname, char *const argv[], char *const envp[], int flags) -> uint64_t {
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fextl::vector<const char*> Args;
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fextl::vector<const char*> Envp;
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if (argv) {
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for (int i = 0; argv[i]; i++) {
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Args.push_back(argv[i]);
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}
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Args.push_back(nullptr);
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}
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if (envp) {
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for (int i = 0; envp[i]; i++) {
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Envp.push_back(envp[i]);
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}
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Envp.push_back(nullptr);
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}
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FEX::HLE::ExecveAtArgs AtArgs {
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.dirfd = dirfd,
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.flags = flags,
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};
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auto* const* ArgsPtr = argv ? const_cast<char* const*>(Args.data()) : nullptr;
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auto* const* EnvpPtr = envp ? const_cast<char* const*>(Envp.data()) : nullptr;
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return FEX::HLE::ExecveHandler(pathname, ArgsPtr, EnvpPtr, AtArgs);
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}));
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}
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}
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