mirror of
https://github.com/jart/cosmopolitan.git
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291 lines
12 KiB
C
291 lines
12 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│vi: set net ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/assert.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/kprintf.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/intrin/weaken.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/nexgen32e/rdtsc.h"
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#include "libc/nt/console.h"
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#include "libc/nt/createfile.h"
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#include "libc/nt/enum/accessmask.h"
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#include "libc/nt/enum/consolemodeflags.h"
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#include "libc/nt/enum/creationdisposition.h"
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#include "libc/nt/enum/fileflagandattributes.h"
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#include "libc/nt/enum/filemapflags.h"
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#include "libc/nt/enum/filesharemode.h"
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#include "libc/nt/enum/pageflags.h"
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#include "libc/nt/files.h"
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#include "libc/nt/memory.h"
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#include "libc/nt/pedef.internal.h"
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#include "libc/nt/process.h"
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#include "libc/nt/runtime.h"
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#include "libc/nt/signals.h"
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#include "libc/nt/struct/ntexceptionpointers.h"
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#include "libc/nt/struct/teb.h"
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#include "libc/nt/thunk/msabi.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/memtrack.internal.h"
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#include "libc/runtime/stack.h"
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#include "libc/runtime/winargs.internal.h"
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#include "libc/sock/internal.h"
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#include "libc/sysv/consts/prot.h"
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#ifdef __x86_64__
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// clang-format off
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__msabi extern typeof(AddVectoredExceptionHandler) *const __imp_AddVectoredExceptionHandler;
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__msabi extern typeof(CloseHandle) *const __imp_CloseHandle;
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__msabi extern typeof(CreateFile) *const __imp_CreateFileW;
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__msabi extern typeof(CreateFileMapping) *const __imp_CreateFileMappingW;
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__msabi extern typeof(DuplicateHandle) *const __imp_DuplicateHandle;
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__msabi extern typeof(ExitProcess) *const __imp_ExitProcess;
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__msabi extern typeof(FreeEnvironmentStrings) *const __imp_FreeEnvironmentStringsW;
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__msabi extern typeof(GetConsoleMode) *const __imp_GetConsoleMode;
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__msabi extern typeof(GetCurrentProcess) *const __imp_GetCurrentProcess;
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__msabi extern typeof(GetCurrentProcessId) *const __imp_GetCurrentProcessId;
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__msabi extern typeof(GetEnvironmentStrings) *const __imp_GetEnvironmentStringsW;
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__msabi extern typeof(GetStdHandle) *const __imp_GetStdHandle;
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__msabi extern typeof(MapViewOfFileEx) *const __imp_MapViewOfFileEx;
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__msabi extern typeof(SetConsoleCP) *const __imp_SetConsoleCP;
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__msabi extern typeof(SetConsoleMode) *const __imp_SetConsoleMode;
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__msabi extern typeof(SetConsoleOutputCP) *const __imp_SetConsoleOutputCP;
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__msabi extern typeof(SetStdHandle) *const __imp_SetStdHandle;
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__msabi extern typeof(VirtualProtect) *const __imp_VirtualProtect;
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__msabi extern typeof(WriteFile) *const __imp_WriteFile;
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// clang-format on
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/*
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* TODO: Why can't we allocate addresses above 4GB on Windows 7 x64?
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* TODO: How can we ensure we never overlap with KERNEL32.DLL?
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*/
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extern int64_t __wincrashearly;
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extern const signed char kNtConsoleHandles[3];
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extern void cosmo(int, char **, char **, long (*)[2]) wontreturn;
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static const short kConsoleModes[3] = {
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kNtEnableProcessedInput | kNtEnableLineInput | kNtEnableEchoInput |
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kNtEnableMouseInput | kNtEnableQuickEditMode | kNtEnableExtendedFlags |
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kNtEnableAutoPosition | kNtEnableInsertMode |
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kNtEnableVirtualTerminalInput,
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kNtEnableProcessedOutput | kNtEnableWrapAtEolOutput |
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kNtEnableVirtualTerminalProcessing,
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kNtEnableProcessedOutput | kNtEnableWrapAtEolOutput |
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kNtEnableVirtualTerminalProcessing,
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};
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// implements all win32 apis on non-windows hosts
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__msabi long __win32_oops(void) {
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assert(!"win32 api called on non-windows host");
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return 0;
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}
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// https://nullprogram.com/blog/2022/02/18/
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__msabi static inline char16_t *MyCommandLine(void) {
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void *cmd;
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asm("mov\t%%gs:(0x60),%0\n"
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"mov\t0x20(%0),%0\n"
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"mov\t0x78(%0),%0\n"
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: "=r"(cmd));
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return cmd;
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}
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__msabi static inline size_t StrLen16(const char16_t *s) {
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size_t n;
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for (n = 0;; ++n) {
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if (!s[n]) {
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return n;
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}
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}
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}
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__msabi static textwindows int OnEarlyWinCrash(struct NtExceptionPointers *ep) {
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uint32_t wrote;
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char buf[64], *p = buf;
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*p++ = 'c';
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*p++ = 'r';
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*p++ = 'a';
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*p++ = 's';
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*p++ = 'h';
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*p++ = ' ';
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*p++ = '0';
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*p++ = 'x';
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p = __fixcpy(p, ep->ExceptionRecord->ExceptionCode, 32);
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*p++ = ' ';
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*p++ = 'r';
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*p++ = 'i';
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*p++ = 'p';
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*p++ = ' ';
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p = __fixcpy(p, ep->ContextRecord ? ep->ContextRecord->Rip : -1, 32);
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*p++ = '\r';
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*p++ = '\n';
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__imp_WriteFile(__imp_GetStdHandle(kNtStdErrorHandle), buf, p - buf, &wrote,
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0);
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__imp_ExitProcess(11);
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__builtin_unreachable();
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}
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// this makes it possible for our read() implementation to periodically
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// poll for signals while performing a blocking overlapped io operation
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__msabi static textwindows void ReopenConsoleForOverlappedIo(void) {
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uint32_t mode;
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int64_t hOld, hNew;
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hOld = __imp_GetStdHandle(kNtStdInputHandle);
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if (__imp_GetConsoleMode(hOld, &mode)) {
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hNew = __imp_CreateFileW(u"CONIN$", kNtGenericRead | kNtGenericWrite,
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kNtFileShareRead | kNtFileShareWrite,
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&kNtIsInheritable, kNtOpenExisting,
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kNtFileFlagOverlapped, 0);
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if (hNew != kNtInvalidHandleValue) {
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__imp_SetStdHandle(kNtStdInputHandle, hNew);
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__imp_CloseHandle(hOld);
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}
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}
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}
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// this ensures close(1) won't accidentally close(2) for example
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__msabi static textwindows void DeduplicateStdioHandles(void) {
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long i, j;
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int64_t h1, h2, h3, proc;
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for (i = 0; i < 3; ++i) {
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h1 = __imp_GetStdHandle(kNtConsoleHandles[i]);
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for (j = i + 1; j < 3; ++j) {
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h3 = h2 = __imp_GetStdHandle(kNtConsoleHandles[j]);
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if (h1 == h2) {
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proc = __imp_GetCurrentProcess();
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__imp_DuplicateHandle(proc, h2, proc, &h3, 0, true,
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kNtDuplicateSameAccess);
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__imp_SetStdHandle(kNtConsoleHandles[j], h3);
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}
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}
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}
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}
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__msabi static textwindows wontreturn void WinMainNew(const char16_t *cmdline) {
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bool32 rc;
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int64_t h, hand;
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uint32_t oldprot;
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struct WinArgs *wa;
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char inflagsbuf[256];
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char outflagsbuf[128];
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const char16_t *env16;
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int i, prot, count, version;
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size_t allocsize, stacksize;
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intptr_t stackaddr, allocaddr;
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version = NtGetPeb()->OSMajorVersion;
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__oldstack = (intptr_t)__builtin_frame_address(0);
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ReopenConsoleForOverlappedIo();
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DeduplicateStdioHandles();
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if ((intptr_t)v_ntsubsystem == kNtImageSubsystemWindowsCui && version >= 10) {
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rc = __imp_SetConsoleCP(kNtCpUtf8);
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NTTRACE("SetConsoleCP(kNtCpUtf8) → %hhhd", rc);
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rc = __imp_SetConsoleOutputCP(kNtCpUtf8);
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NTTRACE("SetConsoleOutputCP(kNtCpUtf8) → %hhhd", rc);
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for (i = 0; i < 3; ++i) {
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hand = __imp_GetStdHandle(kNtConsoleHandles[i]);
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rc = __imp_GetConsoleMode(hand, __ntconsolemode + i);
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NTTRACE("GetConsoleMode(%p, [%s]) → %hhhd", hand,
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i ? (DescribeNtConsoleOutFlags)(outflagsbuf, __ntconsolemode[i])
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: (DescribeNtConsoleInFlags)(inflagsbuf, __ntconsolemode[i]),
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rc);
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rc = __imp_SetConsoleMode(hand, kConsoleModes[i]);
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NTTRACE("SetConsoleMode(%p, %s) → %hhhd", hand,
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i ? (DescribeNtConsoleOutFlags)(outflagsbuf, kConsoleModes[i])
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: (DescribeNtConsoleInFlags)(inflagsbuf, kConsoleModes[i]),
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rc);
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}
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(void)rc;
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}
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_Static_assert(sizeof(struct WinArgs) % FRAMESIZE == 0, "");
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_mmi.p = _mmi.s;
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_mmi.n = ARRAYLEN(_mmi.s);
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stackaddr = GetStaticStackAddr(0);
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stacksize = GetStackSize();
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allocaddr = stackaddr;
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allocsize = stacksize + sizeof(struct WinArgs);
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NTTRACE("WinMainNew() mapping %'zu byte stack at %p", allocsize, allocaddr);
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__imp_MapViewOfFileEx((_mmi.p[0].h = __imp_CreateFileMappingW(
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-1, &kNtIsInheritable, kNtPageExecuteReadwrite,
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allocsize >> 32, allocsize, NULL)),
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kNtFileMapWrite | kNtFileMapExecute, 0, 0, allocsize,
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(void *)allocaddr);
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prot = (intptr_t)ape_stack_prot;
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if (~prot & PROT_EXEC) {
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__imp_VirtualProtect((void *)allocaddr, allocsize, kNtPageReadwrite,
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&oldprot);
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}
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_mmi.p[0].x = allocaddr >> 16;
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_mmi.p[0].y = (allocaddr >> 16) + ((allocsize - 1) >> 16);
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_mmi.p[0].prot = prot;
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_mmi.p[0].flags = 0x00000026; // stack+anonymous
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_mmi.p[0].size = allocsize;
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_mmi.i = 1;
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wa = (struct WinArgs *)(allocaddr + stacksize);
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NTTRACE("WinMainNew() loading arg block");
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count = GetDosArgv(cmdline, wa->argblock, ARRAYLEN(wa->argblock), wa->argv,
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ARRAYLEN(wa->argv));
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for (i = 0; wa->argv[0][i]; ++i) {
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if (wa->argv[0][i] == '\\') {
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wa->argv[0][i] = '/';
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}
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}
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env16 = __imp_GetEnvironmentStringsW();
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NTTRACE("WinMainNew() loading environment");
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GetDosEnviron(env16, wa->envblock, ARRAYLEN(wa->envblock) - 8, wa->envp,
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ARRAYLEN(wa->envp) - 1);
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__imp_FreeEnvironmentStringsW(env16);
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NTTRACE("WinMainNew() switching stacks");
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_jmpstack((char *)(stackaddr + stacksize - (intptr_t)ape_stack_align), cosmo,
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count, wa->argv, wa->envp, wa->auxv);
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}
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__msabi textwindows int64_t WinMain(int64_t hInstance, int64_t hPrevInstance,
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const char *lpCmdLine, int64_t nCmdShow) {
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const char16_t *cmdline;
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extern char os asm("__hostos");
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os = _HOSTWINDOWS; /* madness https://news.ycombinator.com/item?id=21019722 */
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kStartTsc = rdtsc();
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__pid = __imp_GetCurrentProcessId();
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#if !IsTiny()
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__wincrashearly =
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__imp_AddVectoredExceptionHandler(1, (void *)OnEarlyWinCrash);
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#endif
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cmdline = MyCommandLine();
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#ifdef SYSDEBUG
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/* sloppy flag-only check for early initialization */
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if (__strstr16(cmdline, u"--strace")) ++__strace;
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#endif
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NTTRACE("WinMain()");
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if (_weaken(WinSockInit)) {
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_weaken(WinSockInit)();
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}
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if (_weaken(WinMainForked)) {
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_weaken(WinMainForked)();
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}
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WinMainNew(cmdline);
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}
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#endif /* __x86_64__ */
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