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https://github.com/FEX-Emu/FEX.git
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Ryan Houdek
4516e4e9f6
This nearly gets FEX's TestHarnessRunner to be self-hosting inside of FEX. The only thing blocking it currently is that our SBRK emulation reserves the whole region, when it should be "soft-reserved" and mmap with MAP_FIXED_NOREPLACE can override it. Plus an assert in OpcodeDispatcher preventing any 32-bit code from running from a 64-bit process. In the most simple terms, gdt and ldt are setup to be unique per thread, and modify_ldt then modifies that thread's ldt entry. On thread creation, these values get inherited as a copy. This allows installation of 32-bit code entries, which with the previous PRs merged allows the code to attempt jumping to that 32-bit code entry. It then will immediately explode with an assert in our OpcodeDispatcher. We can't allow 32-bit code jumping yet until our OpDispatcher/X86Tables allows runtime selection of 64-bit and 32-bit code entries which is still a ways away. With the assert removed and the SBRK code handling hacked out, /technically/ the TestHarnessRunner can run some code, albeit anything that changes behaviour between bitness is completely incorrect.
38 lines
1.1 KiB
C++
38 lines
1.1 KiB
C++
// SPDX-License-Identifier: MIT
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/*
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$info$
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tags: LinuxSyscalls|syscalls-x86-32
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$end_info$
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*/
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#include <FEXCore/Utils/LogManager.h>
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#include "LinuxSyscalls/Syscalls.h"
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#include "LinuxSyscalls/x32/Syscalls.h"
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#include <errno.h>
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#include <stdint.h>
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#include <sys/types.h>
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#define SYSCALL_STUB(name) \
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do { \
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ERROR_AND_DIE_FMT("Syscall: " #name " stub!"); \
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return -ENOSYS; \
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} while (0)
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namespace FEXCore::Core {
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struct CpuStateFrame;
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}
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namespace FEX::HLE::x32 {
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void RegisterStubs(FEX::HLE::SyscallHandler* Handler) {
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REGISTER_SYSCALL_IMPL_X32(modify_ldt, [](FEXCore::Core::CpuStateFrame* Frame) -> uint64_t { SYSCALL_STUB(readdir); });
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REGISTER_SYSCALL_IMPL_X32(readdir, [](FEXCore::Core::CpuStateFrame* Frame) -> uint64_t { SYSCALL_STUB(readdir); });
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REGISTER_SYSCALL_IMPL_X32(vm86old, [](FEXCore::Core::CpuStateFrame* Frame) -> uint64_t { return -ENOSYS; });
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REGISTER_SYSCALL_IMPL_X32(vm86, [](FEXCore::Core::CpuStateFrame* Frame) -> uint64_t { return -ENOSYS; });
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}
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} // namespace FEX::HLE::x32
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