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cosmopolitan/libc/runtime/winmain.greg.c
Justine Tunney e466dd0553 Add torture test for zipos file descriptors 
This change hardens the code for opening /zip/ files using the system
call interface. Thread safety and signal safety has been improved for
file descriptors in general. We now document fixed addresses that are
needed for low level allocations.
2022-06-15 16:29:49 -07:00

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/*-*- 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;
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 ? DescribeNtConsoleModeOutputFlags(__ntconsolemode[i])
: DescribeNtConsoleModeInputFlags(__ntconsolemode[i]),
rc);
rc = SetConsoleMode(hand, kConsoleModes[i]);
NTTRACE("SetConsoleMode(%p, %s) → %hhhd", hand,
i ? DescribeNtConsoleModeOutputFlags(kConsoleModes[i])
: DescribeNtConsoleModeInputFlags(kConsoleModes[i]),
rc);
}
}
_mmi.p = _mmi.s;
_mmi.n = ARRAYLEN(_mmi.s);
argsize = ROUNDUP(sizeof(struct WinArgs), FRAMESIZE);
stackaddr = (intptr_t)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);
}
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