mirror of
https://github.com/jart/cosmopolitan.git
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183 lines
8.4 KiB
C
183 lines
8.4 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/bits/bits.h"
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#include "libc/bits/pushpop.h"
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#include "libc/bits/weaken.h"
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#include "libc/calls/internal.h"
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#include "libc/dce.h"
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#include "libc/fmt/fmt.h"
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#include "libc/macros.internal.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/filetype.h"
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#include "libc/nt/enum/loadlibrarysearch.h"
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#include "libc/nt/enum/pageflags.h"
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#include "libc/nt/enum/version.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/struct/teb.h"
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#include "libc/runtime/directmap.internal.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/memtrack.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sock/internal.h"
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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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struct WinArgs {
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char *argv[4096];
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char *envp[4092];
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intptr_t auxv[2][2];
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char argblock[ARG_MAX];
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char envblock[ARG_MAX];
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};
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uint32_t __ntconsolemode;
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static noasan textwindows void MakeLongDoubleLongAgain(void) {
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/* 8087 FPU Control Word
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IM: Invalid Operation ───────────────┐
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DM: Denormal Operand ───────────────┐│
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ZM: Zero Divide ───────────────────┐││
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OM: Overflow ─────────────────────┐│││
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UM: Underflow ───────────────────┐││││
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PM: Precision ──────────────────┐│││││
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PC: Precision Control ────────┐ ││││││
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{float,∅,double,long double} │ ││││││
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RC: Rounding Control ───────┐ │ ││││││
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{even, →-∞, →+∞, →0} │┌┤ ││││││
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┌┤││ ││││││
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d││││rr││││││*/
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int x87cw = 0b0000000000000000001101111111;
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asm volatile("fldcw\t%0" : /* no outputs */ : "m"(x87cw));
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}
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static noasan textwindows wontreturn void WinMainNew(void) {
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int64_t h;
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int version;
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size_t size;
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int i, count;
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uint64_t addr;
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int64_t inhand;
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struct WinArgs *wa;
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const char16_t *env16;
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extern char os asm("__hostos");
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os = WINDOWS; /* madness https://news.ycombinator.com/item?id=21019722 */
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version = NtGetPeb()->OSMajorVersion;
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if ((intptr_t)v_ntsubsystem == kNtImageSubsystemWindowsCui && version >= 10) {
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SetConsoleCP(kNtCpUtf8);
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SetConsoleOutputCP(kNtCpUtf8);
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inhand = GetStdHandle(pushpop(kNtStdInputHandle));
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SetEnvironmentVariable(u"TERM", u"xterm-truecolor");
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GetConsoleMode(inhand, &__ntconsolemode);
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SetConsoleMode(inhand, kNtEnableProcessedInput | kNtEnableLineInput |
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kNtEnableEchoInput | kNtEnableMouseInput |
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kNtEnableQuickEditMode | kNtEnableExtendedFlags |
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kNtEnableAutoPosition |
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kNtEnableVirtualTerminalInput);
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SetConsoleMode(GetStdHandle(pushpop(kNtStdOutputHandle)),
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kNtEnableProcessedOutput | kNtEnableWrapAtEolOutput |
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kNtEnableVirtualTerminalProcessing);
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}
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addr = version < 10 ? 0xff00000 : 0x777000000000;
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size = ROUNDUP(STACKSIZE + sizeof(struct WinArgs), FRAMESIZE);
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MapViewOfFileExNuma((_mmi.p[0].h = CreateFileMappingNuma(
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-1, &kNtIsInheritable, kNtPageExecuteReadwrite,
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size >> 32, size, NULL, kNtNumaNoPreferredNode)),
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kNtFileMapWrite | kNtFileMapExecute, 0, 0, size,
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(void *)addr, kNtNumaNoPreferredNode);
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_mmi.p[0].x = addr >> 16;
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_mmi.p[0].y = (addr >> 16) + ((size >> 16) - 1);
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_mmi.p[0].prot = PROT_READ | PROT_WRITE | PROT_EXEC;
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_mmi.p[0].flags = MAP_PRIVATE | MAP_ANONYMOUS;
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_mmi.i = 1;
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wa = (struct WinArgs *)(addr + size - sizeof(struct WinArgs));
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count = GetDosArgv(GetCommandLine(), wa->argblock, ARRAYLEN(wa->argblock),
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wa->argv, 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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GetDosEnviron(env16, wa->envblock, ARRAYLEN(wa->envblock), wa->envp,
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ARRAYLEN(wa->envp));
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FreeEnvironmentStrings(env16);
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wa->auxv[1][0] = pushpop(0L);
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wa->auxv[1][1] = pushpop(0L);
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wa->auxv[0][0] = (intptr_t)wa->argv[0];
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wa->auxv[0][1] = pushpop(31L);
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_jmpstack((char *)addr + STACKSIZE, cosmo, count, wa->argv, wa->envp,
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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. Windows users are afraid of "drive-by downloads" where someone
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* might accidentally an evil DLL to their Downloads folder which
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* then overrides the behavior of a legitimate EXE being run from
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* the downloads folder. Since we don't even use dynamic linking,
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* we've cargo culted some API calls, that may harden against it.
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*
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* 6. Reconfigure x87 FPU so long double is actually long (80 bits).
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*
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* 7. Finally, we need fork. Microsoft designed Windows to prevent us
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* from having fork() so we pass pipe handles in an environment
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* variable literally copy all the memory.
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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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noasan textwindows int64_t WinMain(int64_t hInstance, int64_t hPrevInstance,
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const char *lpCmdLine, int nCmdShow) {
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MakeLongDoubleLongAgain();
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if (weaken(WinSockInit)) weaken(WinSockInit)();
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if (weaken(WinMainForked)) weaken(WinMainForked)();
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WinMainNew();
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}
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