mirror of
https://github.com/FEX-Emu/FEX.git
synced 2026-10-10 01:00:18 +02:00
Billy Laws
0e069f1e97
It is dangerous for FEX to rely on the system CRT as calls can have side effects that are also visible to the running application, and if patches are applied to any CRT exports used during compilation the call checker would trigger a reentry into the JIT to compile the patch and hence deadlock. Only functions that FEX actively uses are implemented, with the rest triggering an abort.
84 lines
1.9 KiB
C++
84 lines
1.9 KiB
C++
// SPDX-License-Identifier: MIT
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#define _SECIMP
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#define _CRTIMP
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#include <cstdlib>
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#include <cstdint>
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#include <unistd.h>
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#include <wchar.h>
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#include <windef.h>
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#include <winternl.h>
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#include <winbase.h>
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#include "../Priv.h"
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namespace {
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char* Env;
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void InitEnv() {
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RtlAcquirePebLock();
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auto ProcessParams = reinterpret_cast<RTL_USER_PROCESS_PARAMETERS64*>(NtCurrentTeb()->ProcessEnvironmentBlock->ProcessParameters);
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wchar_t* EnvW = reinterpret_cast<wchar_t*>(ProcessParams->Environment);
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DWORD SizeW = 4;
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// The PEB environment is terminated by two null wchars.
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for (wchar_t* It = EnvW; It[0] != 0 || It[1] != 0; It++, SizeW += 2)
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;
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DWORD Size;
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RtlUnicodeToMultiByteSize(&Size, EnvW, SizeW);
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Env = reinterpret_cast<char*>(RtlAllocateHeap(GetProcessHeap(), 0, Size + 1));
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RtlUnicodeToMultiByteN(Env, Size + 1, nullptr, EnvW, SizeW);
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RtlReleasePebLock();
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}
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__attribute__((used, section(".CRT$FEXB"))) void (*_InitEnv)(void) = InitEnv;
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} // namespace
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char* getenv(const char* VarName) {
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size_t VarNameLen = strlen(VarName);
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char* It = Env;
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char* Ret = nullptr;
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while (*It) {
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char* Eq = strchr(It, '=');
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if (Eq && Eq - It == VarNameLen && !strncmp(It, VarName, VarNameLen)) {
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Ret = Eq + 1;
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break;
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}
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It += strlen(It) + 1;
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}
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return Ret;
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}
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int atexit(void (*)(void)) {
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return 0;
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}
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#pragma push_macro("abort")
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#undef abort
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void abort(void) {
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UNIMPLEMENTED();
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}
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#pragma pop_macro("abort")
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int getpid(void) {
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return static_cast<int>(GetCurrentProcessId());
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}
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void exit(int _Code) {
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UNIMPLEMENTED();
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}
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DLLEXPORT_FUNC(void, _assert, (const char* message, const char* file, unsigned line)) {
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UNIMPLEMENTED();
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}
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DLLEXPORT_FUNC(
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uintptr_t, _beginthreadex,
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(void* security, unsigned stack_size, unsigned(__stdcall* start_address)(void*), void* arglist, unsigned initflag, unsigned* thrdaddr)) {
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UNIMPLEMENTED();
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}
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DLLEXPORT_FUNC(int*, __sys_nerr, (void)) {
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UNIMPLEMENTED();
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}
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