/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│ │vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│ ╞══════════════════════════════════════════════════════════════════════════════╡ │ Copyright 2020 Justine Alexandra Roberts Tunney │ │ │ │ Permission to use, copy, modify, and/or distribute this software for │ │ any purpose with or without fee is hereby granted, provided that the │ │ above copyright notice and this permission notice appear in all copies. │ │ │ │ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │ │ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │ │ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │ │ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │ │ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │ │ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │ │ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │ │ PERFORMANCE OF THIS SOFTWARE. │ ╚─────────────────────────────────────────────────────────────────────────────*/ #include "libc/calls/state.internal.h" #include "libc/calls/syscall_support-nt.internal.h" #include "libc/dce.h" #include "libc/intrin/describeflags.internal.h" #include "libc/intrin/kprintf.h" #include "libc/intrin/strace.internal.h" #include "libc/intrin/weaken.h" #include "libc/log/libfatal.internal.h" #include "libc/macros.internal.h" #include "libc/nexgen32e/rdtsc.h" #include "libc/nt/console.h" #include "libc/nt/createfile.h" #include "libc/nt/enum/accessmask.h" #include "libc/nt/enum/consolemodeflags.h" #include "libc/nt/enum/creationdisposition.h" #include "libc/nt/enum/fileflagandattributes.h" #include "libc/nt/enum/filemapflags.h" #include "libc/nt/enum/filesharemode.h" #include "libc/nt/enum/pageflags.h" #include "libc/nt/files.h" #include "libc/nt/memory.h" #include "libc/nt/pedef.internal.h" #include "libc/nt/process.h" #include "libc/nt/runtime.h" #include "libc/nt/signals.h" #include "libc/nt/struct/ntexceptionpointers.h" #include "libc/nt/struct/teb.h" #include "libc/nt/thunk/msabi.h" #include "libc/runtime/internal.h" #include "libc/runtime/memtrack.internal.h" #include "libc/runtime/stack.h" #include "libc/runtime/winargs.internal.h" #include "libc/sock/internal.h" #include "libc/sysv/consts/prot.h" #ifdef __x86_64__ // clang-format off __msabi extern typeof(AddVectoredExceptionHandler) *const __imp_AddVectoredExceptionHandler; __msabi extern typeof(CloseHandle) *const __imp_CloseHandle; __msabi extern typeof(CreateFile) *const __imp_CreateFileW; __msabi extern typeof(CreateFileMapping) *const __imp_CreateFileMappingW; __msabi extern typeof(DuplicateHandle) *const __imp_DuplicateHandle; __msabi extern typeof(ExitProcess) *const __imp_ExitProcess; __msabi extern typeof(FreeEnvironmentStrings) *const __imp_FreeEnvironmentStringsW; __msabi extern typeof(GetConsoleMode) *const __imp_GetConsoleMode; __msabi extern typeof(GetCurrentProcess) *const __imp_GetCurrentProcess; __msabi extern typeof(GetCurrentProcessId) *const __imp_GetCurrentProcessId; __msabi extern typeof(GetEnvironmentStrings) *const __imp_GetEnvironmentStringsW; __msabi extern typeof(GetStdHandle) *const __imp_GetStdHandle; __msabi extern typeof(MapViewOfFileEx) *const __imp_MapViewOfFileEx; __msabi extern typeof(SetConsoleCP) *const __imp_SetConsoleCP; __msabi extern typeof(SetConsoleMode) *const __imp_SetConsoleMode; __msabi extern typeof(SetConsoleOutputCP) *const __imp_SetConsoleOutputCP; __msabi extern typeof(SetStdHandle) *const __imp_SetStdHandle; __msabi extern typeof(VirtualProtect) *const __imp_VirtualProtect; __msabi extern typeof(WriteFile) *const __imp_WriteFile; // clang-format on /* * TODO: Why can't we allocate addresses above 4GB on Windows 7 x64? * TODO: How can we ensure we never overlap with KERNEL32.DLL? */ extern int64_t __wincrashearly; extern const signed char kNtConsoleHandles[3]; extern void cosmo(int, char **, char **, long (*)[2]) wontreturn; static const short kConsoleModes[3] = { kNtEnableProcessedInput | kNtEnableLineInput | kNtEnableEchoInput | kNtEnableMouseInput | kNtEnableQuickEditMode | kNtEnableExtendedFlags | kNtEnableAutoPosition | kNtEnableInsertMode | kNtEnableVirtualTerminalInput, kNtEnableProcessedOutput | kNtEnableWrapAtEolOutput | kNtEnableVirtualTerminalProcessing, kNtEnableProcessedOutput | kNtEnableWrapAtEolOutput | kNtEnableVirtualTerminalProcessing, }; // https://nullprogram.com/blog/2022/02/18/ __msabi static inline char16_t *MyCommandLine(void) { void *cmd; asm("mov\t%%gs:(0x60),%0\n" "mov\t0x20(%0),%0\n" "mov\t0x78(%0),%0\n" : "=r"(cmd)); return cmd; } __msabi static inline size_t StrLen16(const char16_t *s) { size_t n; for (n = 0;; ++n) { if (!s[n]) { return n; } } } __msabi static textwindows int OnEarlyWinCrash(struct NtExceptionPointers *ep) { uint32_t wrote; char buf[64], *p = buf; *p++ = 'c'; *p++ = 'r'; *p++ = 'a'; *p++ = 's'; *p++ = 'h'; *p++ = ' '; *p++ = '0'; *p++ = 'x'; p = __fixcpy(p, ep->ExceptionRecord->ExceptionCode, 32); *p++ = ' '; *p++ = 'r'; *p++ = 'i'; *p++ = 'p'; *p++ = ' '; p = __fixcpy(p, ep->ContextRecord ? ep->ContextRecord->Rip : -1, 32); *p++ = '\r'; *p++ = '\n'; __imp_WriteFile(__imp_GetStdHandle(kNtStdErrorHandle), buf, p - buf, &wrote, 0); __imp_ExitProcess(11); __builtin_unreachable(); } // this makes it possible for our read() implementation to periodically // poll for signals while performing a blocking overlapped io operation __msabi static textwindows void ReopenConsoleForOverlappedIo(void) { uint32_t mode; int64_t hOld, hNew; hOld = __imp_GetStdHandle(kNtStdInputHandle); if (__imp_GetConsoleMode(hOld, &mode)) { hNew = __imp_CreateFileW(u"CONIN$", kNtGenericRead | kNtGenericWrite, kNtFileShareRead | kNtFileShareWrite, &kNtIsInheritable, kNtOpenExisting, kNtFileFlagOverlapped, 0); if (hNew != kNtInvalidHandleValue) { __imp_SetStdHandle(kNtStdInputHandle, hNew); __imp_CloseHandle(hOld); } } } // this ensures close(1) won't accidentally close(2) for example __msabi static textwindows void DeduplicateStdioHandles(void) { long i, j; int64_t h1, h2, h3, proc; for (i = 0; i < 3; ++i) { h1 = __imp_GetStdHandle(kNtConsoleHandles[i]); for (j = i + 1; j < 3; ++j) { h3 = h2 = __imp_GetStdHandle(kNtConsoleHandles[j]); if (h1 == h2) { proc = __imp_GetCurrentProcess(); __imp_DuplicateHandle(proc, h2, proc, &h3, 0, true, kNtDuplicateSameAccess); __imp_SetStdHandle(kNtConsoleHandles[j], h3); } } } } __msabi static textwindows wontreturn void WinMainNew(const char16_t *cmdline) { bool32 rc; int64_t h, hand; uint32_t oldprot; struct WinArgs *wa; char inflagsbuf[256]; char outflagsbuf[128]; const char16_t *env16; int i, prot, count, version; size_t allocsize, stacksize; intptr_t stackaddr, allocaddr; version = NtGetPeb()->OSMajorVersion; __oldstack = (intptr_t)__builtin_frame_address(0); ReopenConsoleForOverlappedIo(); DeduplicateStdioHandles(); if ((intptr_t)v_ntsubsystem == kNtImageSubsystemWindowsCui && version >= 10) { rc = __imp_SetConsoleCP(kNtCpUtf8); NTTRACE("SetConsoleCP(kNtCpUtf8) → %hhhd", rc); rc = __imp_SetConsoleOutputCP(kNtCpUtf8); NTTRACE("SetConsoleOutputCP(kNtCpUtf8) → %hhhd", rc); for (i = 0; i < 3; ++i) { hand = __imp_GetStdHandle(kNtConsoleHandles[i]); rc = __imp_GetConsoleMode(hand, __ntconsolemode + i); NTTRACE("GetConsoleMode(%p, [%s]) → %hhhd", hand, i ? (DescribeNtConsoleOutFlags)(outflagsbuf, __ntconsolemode[i]) : (DescribeNtConsoleInFlags)(inflagsbuf, __ntconsolemode[i]), rc); rc = __imp_SetConsoleMode(hand, kConsoleModes[i]); NTTRACE("SetConsoleMode(%p, %s) → %hhhd", hand, i ? (DescribeNtConsoleOutFlags)(outflagsbuf, kConsoleModes[i]) : (DescribeNtConsoleInFlags)(inflagsbuf, kConsoleModes[i]), rc); } (void)rc; } _Static_assert(sizeof(struct WinArgs) % FRAMESIZE == 0, ""); _mmi.p = _mmi.s; _mmi.n = ARRAYLEN(_mmi.s); stackaddr = GetStaticStackAddr(0); stacksize = GetStackSize(); allocaddr = stackaddr; allocsize = stacksize + sizeof(struct WinArgs); NTTRACE("WinMainNew() mapping %'zu byte stack at %p", allocsize, allocaddr); __imp_MapViewOfFileEx((_mmi.p[0].h = __imp_CreateFileMappingW( -1, &kNtIsInheritable, kNtPageExecuteReadwrite, allocsize >> 32, allocsize, NULL)), kNtFileMapWrite | kNtFileMapExecute, 0, 0, allocsize, (void *)allocaddr); prot = (intptr_t)ape_stack_prot; if (~prot & PROT_EXEC) { __imp_VirtualProtect((void *)allocaddr, allocsize, kNtPageReadwrite, &oldprot); } _mmi.p[0].x = allocaddr >> 16; _mmi.p[0].y = (allocaddr >> 16) + ((allocsize - 1) >> 16); _mmi.p[0].prot = prot; _mmi.p[0].flags = 0x00000026; // stack+anonymous _mmi.p[0].size = allocsize; _mmi.i = 1; wa = (struct WinArgs *)(allocaddr + stacksize); NTTRACE("WinMainNew() loading arg block"); count = GetDosArgv(cmdline, wa->argblock, ARRAYLEN(wa->argblock), wa->argv, ARRAYLEN(wa->argv)); for (i = 0; wa->argv[0][i]; ++i) { if (wa->argv[0][i] == '\\') { wa->argv[0][i] = '/'; } } env16 = __imp_GetEnvironmentStringsW(); NTTRACE("WinMainNew() loading environment"); GetDosEnviron(env16, wa->envblock, ARRAYLEN(wa->envblock) - 8, wa->envp, ARRAYLEN(wa->envp) - 1); __imp_FreeEnvironmentStringsW(env16); NTTRACE("WinMainNew() switching stacks"); _jmpstack((char *)(stackaddr + stacksize - (intptr_t)ape_stack_align), cosmo, count, wa->argv, wa->envp, wa->auxv); } __msabi textwindows int64_t WinMain(int64_t hInstance, int64_t hPrevInstance, const char *lpCmdLine, int64_t nCmdShow) { const char16_t *cmdline; extern char os asm("__hostos"); os = _HOSTWINDOWS; /* madness https://news.ycombinator.com/item?id=21019722 */ kStartTsc = rdtsc(); __pid = __imp_GetCurrentProcessId(); #if !IsTiny() __wincrashearly = __imp_AddVectoredExceptionHandler(1, (void *)OnEarlyWinCrash); #endif cmdline = MyCommandLine(); #ifdef SYSDEBUG /* sloppy flag-only check for early initialization */ if (__strstr16(cmdline, u"--strace")) ++__strace; #endif NTTRACE("WinMain()"); if (_weaken(WinSockInit)) { _weaken(WinSockInit)(); } if (_weaken(WinMainForked)) { _weaken(WinMainForked)(); } WinMainNew(cmdline); } #endif /* __x86_64__ */