mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
247 lines
9.9 KiB
C
247 lines
9.9 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/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/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/enum/consolemodeflags.h"
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#include "libc/nt/enum/filemapflags.h"
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#include "libc/nt/enum/pageflags.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/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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#if IsTiny()
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__msabi extern typeof(CreateFileMapping) *const __imp_CreateFileMappingW;
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__msabi extern typeof(MapViewOfFileEx) *const __imp_MapViewOfFileEx;
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__msabi extern typeof(VirtualProtect) *const __imp_VirtualProtect;
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#define CreateFileMapping __imp_CreateFileMappingW
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#define MapViewOfFileEx __imp_MapViewOfFileEx
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#define VirtualProtect __imp_VirtualProtect
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#endif
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#define AT_EXECFN 31L
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#define MAP_ANONYMOUS 32
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#define MAP_PRIVATE 2
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#define PROT_EXEC 4
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#define PROT_READ 1
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#define PROT_WRITE 2
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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 char kConsoleHandles[3];
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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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// https://nullprogram.com/blog/2022/02/18/
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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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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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WriteFile(GetStdHandle(kNtStdErrorHandle), buf, p - buf, &wrote, 0);
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ExitProcess(200);
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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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if ((intptr_t)v_ntsubsystem == kNtImageSubsystemWindowsCui && version >= 10) {
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rc = SetConsoleCP(kNtCpUtf8);
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NTTRACE("SetConsoleCP(kNtCpUtf8) → %hhhd", rc);
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rc = 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 = GetStdHandle(kConsoleHandles[i]);
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rc = 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 = 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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}
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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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MapViewOfFileEx(
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(_mmi.p[0].h =
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CreateFileMapping(-1, &kNtIsInheritable, kNtPageExecuteReadwrite,
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allocsize >> 32, allocsize, NULL)),
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kNtFileMapWrite | kNtFileMapExecute, 0, 0, allocsize, (void *)allocaddr);
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prot = (intptr_t)ape_stack_prot;
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if (~prot & PROT_EXEC) {
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VirtualProtect((void *)allocaddr, allocsize, kNtPageReadwrite, &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 = GetEnvironmentStrings();
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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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FreeEnvironmentStrings(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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/**
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* Main function on Windows NT.
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*
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* The Cosmopolitan Runtime provides the following services, which aim
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* to bring Windows NT behavior closer in harmony with System Five:
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*
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* 1. We configure CMD.EXE for UTF-8 and enable ANSI colors on Win10.
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*
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* 2. Command line arguments are passed as a blob of UTF-16 text. We
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* chop them up into an char *argv[] UTF-8 data structure, in
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* accordance with the DOS conventions for argument quoting.
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*
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* 3. Environment variables are passed to us as a sorted UTF-16 double
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* NUL terminated list. We translate this to char ** using UTF-8.
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*
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* 4. Allocates new stack at a high address. NT likes to choose a
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* stack address that's beneath the program image. We want to be
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* able to assume that stack addresses are located at higher
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* addresses than heap and program memory.
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*
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* 5. Reconfigure x87 FPU so long double is actually long (80 bits).
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*
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* 6. Finally, we need fork. Since disagreeing with fork is axiomatic to
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* Microsoft's engineering culture, we need to go to great lengths to
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* have it anyway without breaking Microsoft's rules: using the WIN32
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* API (i.e. not NTDLL) to copy MAP_PRIVATE pages via a pipe. It'd go
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* faster if the COW pages CreateFileMappingNuma claims to have turns
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* out to be true. Until then we have a "PC Scale" and entirely legal
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* workaround that they hopefully won't block using Windows Defender.
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*
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* @param hInstance call GetModuleHandle(NULL) from main if you need it
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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 = GetCurrentProcessId();
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#if !IsTiny()
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__wincrashearly = 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)) _weaken(WinSockInit)();
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if (_weaken(WinMainForked)) _weaken(WinMainForked)();
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WinMainNew(cmdline);
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}
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