/*-*- 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/state.internal.h"
#include "libc/calls/strace.internal.h"
#include "libc/calls/syscall_support-nt.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/runtime/winargs.internal.h"
#include "libc/sock/internal.h"
#include "libc/str/str.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?
*/
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));
}
// https://nullprogram.com/blog/2022/02/18/
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;
}
static inline size_t StrLen16(const char16_t *s) {
size_t n;
for (n = 0;; ++n) {
if (!s[n]) {
return n;
}
}
}
__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;
char inflagsbuf[256];
char outflagsbuf[128];
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 ? (DescribeNtConsoleOutFlags)(outflagsbuf, __ntconsolemode[i])
: (DescribeNtConsoleInFlags)(inflagsbuf, __ntconsolemode[i]),
rc);
rc = SetConsoleMode(hand, kConsoleModes[i]);
NTTRACE("SetConsoleMode(%p, %s) → %hhhd", hand,
i ? (DescribeNtConsoleOutFlags)(outflagsbuf, kConsoleModes[i])
: (DescribeNtConsoleInFlags)(inflagsbuf, 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 = 0x00000026; // stack+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");
os = WINDOWS; /* madness https://news.ycombinator.com/item?id=21019722 */
kStartTsc = rdtsc();
__pid = GetCurrentProcessId();
#if !IsTiny()
__wincrashearly = AddVectoredExceptionHandler(1, (void *)OnEarlyWinCrash);
#endif
cmdline = MyCommandLine();
#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);
}