/*-*- 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/assert.h" #include "libc/calls/internal.h" #include "libc/calls/state.internal.h" #include "libc/calls/syscall_support-nt.internal.h" #include "libc/dce.h" #include "libc/intrin/asan.internal.h" #include "libc/intrin/asancodes.h" #include "libc/intrin/describeflags.internal.h" #include "libc/intrin/getenv.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/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/ipc.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/thread.h" #include "libc/nt/thunk/msabi.h" #include "libc/runtime/internal.h" #include "libc/runtime/memtrack.internal.h" #include "libc/runtime/runtime.h" #include "libc/runtime/stack.h" #include "libc/runtime/winargs.internal.h" #include "libc/sock/internal.h" #include "libc/str/str.h" #include "libc/sysv/consts/prot.h" #ifdef __x86_64__ // clang-format off __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(GetFileAttributes) *const __imp_GetFileAttributesW; __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; // clang-format on void cosmo(int, char **, char **, long (*)[2]) wontreturn; void __switch_stacks(int, char **, char **, long (*)[2], void (*)(int, char **, char **, long (*)[2]), intptr_t) wontreturn; static const signed char kNtStdio[3] = { (signed char)kNtStdInputHandle, (signed char)kNtStdOutputHandle, (signed char)kNtStdErrorHandle, }; forceinline int IsAlpha(int c) { return ('A' <= c && c <= 'Z') || ('a' <= c && c <= 'z'); } // implements all win32 apis on non-windows hosts __msabi long __oops_win32(void) { assert(!"win32 api called on non-windows host"); return 0; } // 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; } // returns true if utf-8 path is a win32-style path that exists __msabi static textwindows bool32 WinFileExists(const char *path) { uint16_t path16[PATH_MAX]; size_t z = ARRAYLEN(path16); size_t n = tprecode8to16(path16, z, path).ax; if (n >= z - 1) return false; return __imp_GetFileAttributesW(path16) != -1u; } // this ensures close(1) won't accidentally close(2) for example __msabi static textwindows void DeduplicateStdioHandles(void) { for (long i = 0; i < 3; ++i) { int64_t h1 = __imp_GetStdHandle(kNtStdio[i]); for (long j = i + 1; j < 3; ++j) { int64_t h2 = __imp_GetStdHandle(kNtStdio[j]); if (h1 == h2) { int64_t h3, proc = __imp_GetCurrentProcess(); __imp_DuplicateHandle(proc, h2, proc, &h3, 0, false, kNtDuplicateSameAccess); __imp_SetStdHandle(kNtStdio[j], h3); } } } } // main function of windows init process // i.e. first process spawned that isn't forked __msabi static textwindows wontreturn void WinInit(const char16_t *cmdline) { __oldstack = (intptr_t)__builtin_frame_address(0); // make console into utf-8 ansi/xterm style tty if (NtGetPeb()->OSMajorVersion >= 10 && (intptr_t)v_ntsubsystem == kNtImageSubsystemWindowsCui) { __imp_SetConsoleCP(kNtCpUtf8); __imp_SetConsoleOutputCP(kNtCpUtf8); for (int i = 1; i <= 2; ++i) { uint32_t m; intptr_t h = __imp_GetStdHandle(kNtStdio[i]); __imp_GetConsoleMode(h, &m); __imp_SetConsoleMode(h, m | kNtEnableVirtualTerminalProcessing); } } // allocate memory for stack and argument block _Static_assert(sizeof(struct WinArgs) % FRAMESIZE == 0, ""); _mmi.p = _mmi.s; _mmi.n = ARRAYLEN(_mmi.s); uintptr_t stackaddr = GetStaticStackAddr(0); size_t stacksize = GetStaticStackSize(); __imp_MapViewOfFileEx( (_mmi.p[0].h = __imp_CreateFileMappingW( -1, 0, kNtPageExecuteReadwrite, stacksize >> 32, stacksize, NULL)), kNtFileMapWrite | kNtFileMapExecute, 0, 0, stacksize, (void *)stackaddr); int prot = (intptr_t)ape_stack_prot; if (~prot & PROT_EXEC) { uint32_t old; __imp_VirtualProtect((void *)stackaddr, stacksize, kNtPageReadwrite, &old); } _mmi.p[0].x = stackaddr >> 16; _mmi.p[0].y = (stackaddr >> 16) + ((stacksize - 1) >> 16); _mmi.p[0].prot = prot; _mmi.p[0].flags = 0x00000026; // stack+anonymous _mmi.p[0].size = stacksize; _mmi.i = 1; struct WinArgs *wa = (struct WinArgs *)(stackaddr + (stacksize - sizeof(struct WinArgs))); // allocate asan memory if needed if (IsAsan()) { uintptr_t shadowaddr = 0x7fff8000 + (stackaddr >> 3); uintptr_t shadowend = 0x7fff8000 + ((stackaddr + stacksize) >> 3); uintptr_t shallocaddr = ROUNDDOWN(shadowaddr, FRAMESIZE); uintptr_t shallocend = ROUNDUP(shadowend, FRAMESIZE); uintptr_t shallocsize = shallocend - shallocaddr; __imp_MapViewOfFileEx( (_mmi.p[1].h = __imp_CreateFileMappingW( -1, 0, kNtPageReadwrite, shallocsize >> 32, shallocsize, NULL)), kNtFileMapWrite, 0, 0, shallocsize, (void *)shallocaddr); _mmi.p[1].x = shallocaddr >> 16; _mmi.p[1].y = (shallocaddr >> 16) + ((shallocsize - 1) >> 16); _mmi.p[1].prot = PROT_READ | PROT_WRITE; _mmi.p[1].flags = 0x00000022; // private+anonymous _mmi.p[1].size = shallocsize; _mmi.i = 2; __asan_poison((void *)stackaddr, GetGuardSize(), kAsanStackOverflow); } // parse utf-16 command into utf-8 argv array in argument block int count = GetDosArgv(cmdline, wa->argblock, ARRAYLEN(wa->argblock), wa->argv, ARRAYLEN(wa->argv)); // munge argv so dos paths become cosmo paths for (int i = 0; wa->argv[i]; ++i) { if (wa->argv[i][0] == '\\' && // wa->argv[i][1] == '\\') { // don't munge new technology style paths continue; } if (!WinFileExists(wa->argv[i])) { // don't munge if we're not certain it's a file continue; } // use forward slashes for (int j = 0; wa->argv[i][j]; ++j) { if (wa->argv[i][j] == '\\') { wa->argv[i][j] = '/'; } } // turn c:/... into /c/... if (IsAlpha(wa->argv[i][0]) && // wa->argv[i][1] == ':' && // wa->argv[i][2] == '/') { wa->argv[i][1] = wa->argv[i][0]; wa->argv[i][0] = '/'; } } // translate utf-16 win32 environment into utf-8 environment variables char16_t *env16 = __imp_GetEnvironmentStringsW(); GetDosEnviron(env16, wa->envblock, ARRAYLEN(wa->envblock) - 8, wa->envp, ARRAYLEN(wa->envp) - 1); __imp_FreeEnvironmentStringsW(env16); __envp = &wa->envp[0]; // handover control to cosmopolitan runtime __switch_stacks(count, wa->argv, wa->envp, wa->auxv, cosmo, stackaddr + (stacksize - sizeof(struct WinArgs))); } __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(); __umask = 077; __pid = __imp_GetCurrentProcessId(); cmdline = MyCommandLine(); #ifdef SYSDEBUG // sloppy flag-only check for early initialization if (__strstr16(cmdline, u"--strace")) ++__strace; #endif if (_weaken(WinSockInit)) { _weaken(WinSockInit)(); } DeduplicateStdioHandles(); if (_weaken(WinMainStdin)) { _weaken(WinMainStdin)(); } if (_weaken(WinMainForked)) { _weaken(WinMainForked)(); } WinInit(cmdline); } #endif /* __x86_64__ */