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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.
83 lines
2.2 KiB
C++
83 lines
2.2 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/Types.h"
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#include <FEXHeaderUtils/Syscalls.h>
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#include <linux/sem.h>
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#include <stddef.h>
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#include <stdint.h>
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namespace FEXCore::Core {
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struct CpuStateFrame;
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}
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ARG_TO_STR(FEX::HLE::x64::semun, "%lx")
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namespace FEX::HLE::x64 {
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void RegisterSemaphore(FEX::HLE::SyscallHandler *Handler) {
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REGISTER_SYSCALL_IMPL_X64(semctl, [](FEXCore::Core::CpuStateFrame *Frame, int semid, int semnum, int cmd, FEX::HLE::x64::semun semun) -> uint64_t {
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uint64_t Result{};
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switch (cmd) {
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case IPC_SET: {
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struct semid64_ds buf{};
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buf = *semun.buf;
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Result = ::syscall(SYSCALL_DEF(semctl), semid, semnum, cmd, &buf);
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if (Result != -1) {
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*semun.buf = buf;
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}
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break;
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}
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case SEM_STAT:
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case SEM_STAT_ANY:
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case IPC_STAT: {
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struct semid64_ds buf{};
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Result = ::syscall(SYSCALL_DEF(semctl), semid, semnum, cmd, &buf);
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if (Result != -1) {
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*semun.buf = buf;
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}
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break;
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}
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case SEM_INFO:
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case IPC_INFO: {
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struct fex_seminfo si{};
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Result = ::syscall(SYSCALL_DEF(semctl), semid, semnum, cmd, &si);
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if (Result != -1) {
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memcpy(semun.__buf, &si, sizeof(si));
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}
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break;
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}
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case GETALL:
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case SETALL: {
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// ptr is just a int32_t* in this case
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Result = ::syscall(SYSCALL_DEF(semctl), semid, semnum, cmd, semun.array);
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break;
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}
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case SETVAL: {
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// ptr is just a int32_t in this case
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Result = ::syscall(SYSCALL_DEF(semctl), semid, semnum, cmd, semun.val);
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break;
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}
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case IPC_RMID:
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case GETPID:
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case GETNCNT:
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case GETZCNT:
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case GETVAL:
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Result = ::syscall(SYSCALL_DEF(semctl), semid, semnum, cmd, semun);
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break;
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default:
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LOGMAN_MSG_A_FMT("Unhandled semctl cmd: {}", cmd);
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return -EINVAL;
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}
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SYSCALL_ERRNO();
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});
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}
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}
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