/*-*- 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/bits/bits.h" #include "libc/bits/pushpop.h" #include "libc/bits/weaken.h" #include "libc/calls/internal.h" #include "libc/calls/strace.internal.h" #include "libc/dce.h" #include "libc/elf/pf2prot.internal.h" #include "libc/errno.h" #include "libc/fmt/fmt.h" #include "libc/intrin/describeflags.internal.h" #include "libc/intrin/kprintf.h" #include "libc/intrin/nomultics.internal.h" #include "libc/log/libfatal.internal.h" #include "libc/macros.internal.h" #include "libc/nexgen32e/bsr.h" #include "libc/nexgen32e/nt2sysv.h" #include "libc/nexgen32e/rdtsc.h" #include "libc/nt/console.h" #include "libc/nt/enum/consolemodeflags.h" #include "libc/nt/enum/filemapflags.h" #include "libc/nt/enum/filetype.h" #include "libc/nt/enum/loadlibrarysearch.h" #include "libc/nt/enum/pageflags.h" #include "libc/nt/enum/version.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/synchronization.h" #include "libc/nt/thunk/msabi.h" #include "libc/runtime/directmap.internal.h" #include "libc/runtime/internal.h" #include "libc/runtime/memtrack.internal.h" #include "libc/runtime/runtime.h" #include "libc/sock/internal.h" #include "libc/str/tpenc.h" #include "libc/str/utf16.h" #if IsTiny() __msabi extern typeof(CreateFileMapping) *const __imp_CreateFileMappingW; __msabi extern typeof(MapViewOfFileEx) *const __imp_MapViewOfFileEx; __msabi extern typeof(VirtualProtect) *const __imp_VirtualProtect; #define CreateFileMapping __imp_CreateFileMappingW #define MapViewOfFileEx __imp_MapViewOfFileEx #define VirtualProtect __imp_VirtualProtect #endif #define AT_EXECFN 31L #define MAP_ANONYMOUS 32 #define MAP_PRIVATE 2 #define PROT_EXEC 4 #define PROT_READ 1 #define PROT_WRITE 2 /* * TODO: Why can't we allocate addresses above 4GB on Windows 7 x64? * TODO: How can we ensure we never overlap with KERNEL32.DLL? */ struct WinArgs { char *argv[4096]; char *envp[4092]; intptr_t auxv[2][2]; char argblock[ARG_MAX]; char envblock[ARG_MAX]; }; extern uint32_t __winmainpid; extern int64_t __wincrashearly; extern const char kConsoleHandles[3]; static const short kConsoleModes[3] = { kNtEnableProcessedInput | kNtEnableLineInput | kNtEnableEchoInput | kNtEnableMouseInput | kNtEnableQuickEditMode | kNtEnableExtendedFlags | kNtEnableAutoPosition | kNtEnableInsertMode | kNtEnableVirtualTerminalInput, kNtEnableProcessedOutput | kNtEnableWrapAtEolOutput | kNtEnableVirtualTerminalProcessing, kNtEnableProcessedOutput | kNtEnableWrapAtEolOutput | kNtEnableVirtualTerminalProcessing, }; forceinline void MakeLongDoubleLongAgain(void) { /* 8087 FPU Control Word IM: Invalid Operation ───────────────┐ DM: Denormal Operand ───────────────┐│ ZM: Zero Divide ───────────────────┐││ OM: Overflow ─────────────────────┐│││ UM: Underflow ───────────────────┐││││ PM: Precision ──────────────────┐│││││ PC: Precision Control ────────┐ ││││││ {float,∅,double,long double} │ ││││││ RC: Rounding Control ───────┐ │ ││││││ {even, →-∞, →+∞, →0} │┌┤ ││││││ ┌┤││ ││││││ d││││rr││││││*/ int x87cw = 0b0000000000000000001101111111; asm volatile("fldcw\t%0" : /* no outputs */ : "m"(x87cw)); } __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'; WriteFile(GetStdHandle(kNtStdErrorHandle), buf, p - buf, &wrote, 0); ExitProcess(200); } __msabi static textwindows wontreturn void WinMainNew(const char16_t *cmdline) { bool32 rc; int64_t h, hand; uint32_t oldprot; struct WinArgs *wa; const char16_t *env16; int i, prot, count, version; intptr_t stackaddr, allocaddr; size_t allocsize, argsize, stacksize; version = NtGetPeb()->OSMajorVersion; __oldstack = (intptr_t)__builtin_frame_address(0); if ((intptr_t)v_ntsubsystem == kNtImageSubsystemWindowsCui && version >= 10) { __winmainpid = __pid; rc = SetConsoleCP(kNtCpUtf8); NTTRACE("SetConsoleCP(kNtCpUtf8) → %hhhd", rc); rc = SetConsoleOutputCP(kNtCpUtf8); NTTRACE("SetConsoleOutputCP(kNtCpUtf8) → %hhhd", rc); for (i = 0; i < 3; ++i) { hand = GetStdHandle(kConsoleHandles[i]); rc = GetConsoleMode(hand, __ntconsolemode + i); NTTRACE("GetConsoleMode(%p, [%s]) → %hhhd", hand, i ? DescribeNtConsoleModeOutputFlags(__ntconsolemode[i]) : DescribeNtConsoleModeInputFlags(__ntconsolemode[i]), rc); rc = SetConsoleMode(hand, kConsoleModes[i]); NTTRACE("SetConsoleMode(%p, %s) → %hhhd", hand, i ? DescribeNtConsoleModeOutputFlags(kConsoleModes[i]) : DescribeNtConsoleModeInputFlags(kConsoleModes[i]), rc); } } _mmi.p = _mmi.s; _mmi.n = ARRAYLEN(_mmi.s); argsize = ROUNDUP(sizeof(struct WinArgs), FRAMESIZE); stackaddr = GetStaticStackAddr(0); stacksize = GetStackSize(); allocsize = argsize + stacksize; allocaddr = stackaddr - argsize; NTTRACE("WinMainNew() mapping %'zu byte arg block + stack at %p", allocsize, allocaddr); MapViewOfFileEx( (_mmi.p[0].h = CreateFileMapping(-1, &kNtIsInheritable, kNtPageExecuteReadwrite, allocsize >> 32, allocsize, NULL)), kNtFileMapWrite | kNtFileMapExecute, 0, 0, allocsize, (void *)allocaddr); prot = (intptr_t)ape_stack_prot; if (~prot & PROT_EXEC) { VirtualProtect((void *)allocaddr, allocsize, kNtPageReadwrite, &oldprot); } _mmi.p[0].x = allocaddr >> 16; _mmi.p[0].y = (allocaddr >> 16) + ((allocsize >> 16) - 1); _mmi.p[0].prot = prot; _mmi.p[0].flags = MAP_PRIVATE | MAP_ANONYMOUS; _mmi.p[0].size = allocsize; _mmi.i = 1; wa = (struct WinArgs *)allocaddr; 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 = GetEnvironmentStrings(); NTTRACE("WinMainNew() loading environment"); GetDosEnviron(env16, wa->envblock, ARRAYLEN(wa->envblock) - 8, wa->envp, ARRAYLEN(wa->envp) - 1); FreeEnvironmentStrings(env16); NTTRACE("WinMainNew() switching stacks"); _jmpstack((char *)(stackaddr + stacksize - (intptr_t)ape_stack_align), cosmo, count, wa->argv, wa->envp, wa->auxv); } /** * Main function on Windows NT. * * The Cosmopolitan Runtime provides the following services, which aim * to bring Windows NT behavior closer in harmony with System Five: * * 1. We configure CMD.EXE for UTF-8 and enable ANSI colors on Win10. * * 2. Command line arguments are passed as a blob of UTF-16 text. We * chop them up into an char *argv[] UTF-8 data structure, in * accordance with the DOS conventions for argument quoting. * * 3. Environment variables are passed to us as a sorted UTF-16 double * NUL terminated list. We translate this to char ** using UTF-8. * * 4. Allocates new stack at a high address. NT likes to choose a * stack address that's beneath the program image. We want to be * able to assume that stack addresses are located at higher * addresses than heap and program memory. * * 5. Reconfigure x87 FPU so long double is actually long (80 bits). * * 6. Finally, we need fork. Since disagreeing with fork is axiomatic to * Microsoft's engineering culture, we need to go to great lengths to * have it anyway without breaking Microsoft's rules: using the WIN32 * API (i.e. not NTDLL) to copy MAP_PRIVATE pages via a pipe. It'd go * faster if the COW pages CreateFileMappingNuma claims to have turns * out to be true. Until then we have a "PC Scale" and entirely legal * workaround that they hopefully won't block using Windows Defender. * * @param hInstance call GetModuleHandle(NULL) from main if you need it */ __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"); extern uint64_t ts asm("kStartTsc"); os = WINDOWS; /* madness https://news.ycombinator.com/item?id=21019722 */ ts = rdtsc(); __nomultics = true; __pid = GetCurrentProcessId(); __wincrashearly = AddVectoredExceptionHandler(1, (void *)OnEarlyWinCrash); cmdline = GetCommandLine(); #ifdef SYSDEBUG /* sloppy flag-only check for early initialization */ if (__strstr16(cmdline, u"--strace")) ++__strace; #endif NTTRACE("WinMain()"); MakeLongDoubleLongAgain(); if (weaken(WinSockInit)) weaken(WinSockInit)(); if (weaken(WinMainForked)) weaken(WinMainForked)(); WinMainNew(cmdline); }