mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 11:37:35 +00:00
7e0a09feec
This change ports APE Loader to Linux AARCH64, so that Raspberry Pi users can run programs like redbean, without the executable needing to modify itself. Progress has also slipped into this change on the issue of making progress better conforming to user expectations and industry standards regarding which symbols we're allowed to declare
374 lines
14 KiB
C
374 lines
14 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/internal.h"
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#include "libc/calls/ntspawn.h"
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#include "libc/calls/state.internal.h"
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#include "libc/calls/syscall-nt.internal.h"
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#include "libc/calls/syscall_support-nt.internal.h"
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#include "libc/calls/wincrash.internal.h"
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#include "libc/errno.h"
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#include "libc/fmt/itoa.h"
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#include "libc/intrin/atomic.h"
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#include "libc/intrin/directmap.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/macros.internal.h"
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#include "libc/mem/alloca.h"
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#include "libc/mem/mem.h"
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#include "libc/nexgen32e/nt2sysv.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/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/pageflags.h"
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#include "libc/nt/enum/processcreationflags.h"
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#include "libc/nt/enum/startf.h"
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#include "libc/nt/ipc.h"
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#include "libc/nt/memory.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/runtime/internal.h"
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#include "libc/runtime/memtrack.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/symbols.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/o.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/thread/tls.h"
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#ifdef __x86_64__
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__static_yoink("_check_sigchld");
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extern int64_t __wincrashearly;
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bool32 __onntconsoleevent_nt(uint32_t);
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void kmalloc_unlock(void);
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static textwindows wontreturn void AbortFork(const char *func) {
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STRACE("fork() %s() failed %d", func, GetLastError());
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ExitProcess(177);
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}
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static textwindows char16_t *ParseInt(char16_t *p, int64_t *x) {
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*x = 0;
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while (*p == ' ') p++;
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while ('0' <= *p && *p <= '9') {
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*x *= 10;
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*x += *p++ - '0';
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}
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return p;
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}
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static inline textwindows ssize_t ForkIo(int64_t h, char *p, size_t n,
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bool32 (*f)()) {
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size_t i;
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uint32_t x;
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for (i = 0; i < n; i += x) {
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if (!f(h, p + i, n - i, &x, NULL)) {
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return __winerr();
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}
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}
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return i;
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}
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static dontinline textwindows bool ForkIo2(int64_t h, void *buf, size_t n,
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bool32 (*fn)(), const char *sf,
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bool ischild) {
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ssize_t rc = ForkIo(h, buf, n, fn);
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if (ischild) __tls_enabled_set(false); // prevent tls crash in kprintf
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NTTRACE("%s(%ld, %p, %'zu) → %'zd% m", sf, h, buf, n, rc);
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return rc != -1;
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}
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static dontinline textwindows bool WriteAll(int64_t h, void *buf, size_t n) {
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return ForkIo2(h, buf, n, WriteFile, "WriteFile", false);
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}
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static textwindows dontinline void ReadOrDie(int64_t h, void *buf, size_t n) {
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if (!ForkIo2(h, buf, n, ReadFile, "ReadFile", true)) {
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AbortFork("ReadFile");
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}
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}
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static textwindows int64_t MapOrDie(uint32_t prot, uint64_t size) {
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int64_t h;
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if ((h = CreateFileMapping(-1, 0, prot, size >> 32, size, 0))) {
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return h;
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} else {
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AbortFork("MapOrDie");
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}
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}
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static textwindows void ViewOrDie(int64_t h, uint32_t access, size_t pos,
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size_t size, void *base) {
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void *got;
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got = MapViewOfFileEx(h, access, pos >> 32, pos, size, base);
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if (!got || (base && got != base)) {
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AbortFork("ViewOrDie");
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}
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}
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static textwindows int OnForkCrash(struct NtExceptionPointers *ep) {
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kprintf("error: fork() child crashed!%n"
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"\tExceptionCode = %#x%n"
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"\tRip = %x%n",
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ep->ExceptionRecord->ExceptionCode,
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ep->ContextRecord ? ep->ContextRecord->Rip : -1);
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ExitProcess(73);
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}
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textwindows void WinMainForked(void) {
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bool ok;
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jmp_buf jb;
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int64_t reader;
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char *addr, *shad;
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struct DirectMap dm;
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uint64_t size, upsize;
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int64_t oncrash, savetsc;
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struct MemoryInterval *maps;
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char16_t fvar[21 + 1 + 21 + 1];
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uint32_t i, varlen, oldprot, savepid;
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long mapcount, mapcapacity, specialz;
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// check to see if the process was actually forked
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// this variable should have the pipe handle numba
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varlen = GetEnvironmentVariable(u"_FORK", fvar, ARRAYLEN(fvar));
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if (!varlen || varlen >= ARRAYLEN(fvar)) return;
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NTTRACE("WinMainForked()");
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SetEnvironmentVariable(u"_FORK", NULL);
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#ifdef SYSDEBUG
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oncrash = AddVectoredExceptionHandler(1, NT2SYSV(OnForkCrash));
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#endif
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ParseInt(fvar, &reader);
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// read the cpu state from the parent process & plus
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// read the list of mappings from the parent process
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// this is stored in a special secretive memory map!
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// read ExtendMemoryIntervals for further details :|
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maps = (void *)kMemtrackStart;
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ReadOrDie(reader, jb, sizeof(jb));
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ReadOrDie(reader, &mapcount, sizeof(_mmi.i));
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ReadOrDie(reader, &mapcapacity, sizeof(_mmi.n));
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specialz = ROUNDUP(mapcapacity * sizeof(_mmi.p[0]), kMemtrackGran);
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ViewOrDie(MapOrDie(kNtPageReadwrite, specialz), kNtFileMapWrite, 0, specialz,
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maps);
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ReadOrDie(reader, maps, mapcount * sizeof(_mmi.p[0]));
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if (IsAsan()) {
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shad = (char *)(((intptr_t)maps >> 3) + 0x7fff8000);
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size = ROUNDUP(specialz >> 3, FRAMESIZE);
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ViewOrDie(MapOrDie(kNtPageReadwrite, size), kNtFileMapWrite, 0, size, maps);
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ReadOrDie(reader, shad, (mapcount * sizeof(_mmi.p[0])) >> 3);
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}
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// read the heap mappings from the parent process
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for (i = 0; i < mapcount; ++i) {
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addr = (char *)((uint64_t)maps[i].x << 16);
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size = maps[i].size;
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if ((maps[i].flags & MAP_TYPE) != MAP_SHARED) {
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upsize = ROUNDUP(size, FRAMESIZE);
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// we don't need to close the map handle because sys_mmap_nt
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// doesn't mark it inheritable across fork() for MAP_PRIVATE
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ViewOrDie((maps[i].h = MapOrDie(kNtPageExecuteReadwrite, upsize)),
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kNtFileMapWrite | kNtFileMapExecute, 0, upsize, addr);
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ReadOrDie(reader, addr, size);
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} else {
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// we can however safely inherit MAP_SHARED with zero copy
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ViewOrDie(maps[i].h,
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maps[i].readonlyfile ? kNtFileMapRead | kNtFileMapExecute
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: kNtFileMapWrite | kNtFileMapExecute,
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maps[i].offset, size, addr);
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}
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}
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// read the .data and .bss program image sections
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savepid = __pid;
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savetsc = kStartTsc;
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ReadOrDie(reader, __data_start, __data_end - __data_start);
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ReadOrDie(reader, __bss_start, __bss_end - __bss_start);
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__pid = savepid;
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kStartTsc = savetsc;
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__threaded = false;
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__tls_index = 0;
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__tls_enabled_set(false);
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// apply fixups and reapply memory protections
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_mmi.p = maps;
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_mmi.n = specialz / sizeof(_mmi.p[0]);
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for (i = 0; i < mapcount; ++i) {
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if (!VirtualProtect((void *)((uint64_t)maps[i].x << 16), maps[i].size,
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__prot2nt(maps[i].prot, maps[i].iscow), &oldprot)) {
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AbortFork("VirtualProtect");
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}
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}
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// mitosis complete
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if (!CloseHandle(reader)) {
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AbortFork("CloseHandle");
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}
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// rewrap the stdin named pipe hack
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// since the handles closed on fork
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struct Fds *fds = __veil("r", &g_fds);
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fds->p[0].handle = GetStdHandle(kNtStdInputHandle);
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fds->p[1].handle = GetStdHandle(kNtStdOutputHandle);
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fds->p[2].handle = GetStdHandle(kNtStdErrorHandle);
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// untrack children of parent since we specify with both
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// CreateProcess() and CreateThread() as non-inheritable
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for (i = 0; i < fds->n; ++i) {
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if (fds->p[i].kind == kFdProcess) {
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fds->p[i].kind = 0;
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atomic_store_explicit(&fds->f, MIN(i, fds->f), memory_order_relaxed);
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}
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}
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// restore the crash reporting stuff
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#ifdef SYSDEBUG
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RemoveVectoredExceptionHandler(oncrash);
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#endif
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if (_weaken(__wincrash_nt)) {
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if (!IsTiny()) {
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RemoveVectoredExceptionHandler(__wincrashearly);
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}
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AddVectoredExceptionHandler(1, (void *)_weaken(__wincrash_nt));
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}
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if (_weaken(__onntconsoleevent_nt)) {
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SetConsoleCtrlHandler(_weaken(__onntconsoleevent_nt), 1);
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}
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// jump back into function below
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longjmp(jb, 1);
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}
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textwindows int sys_fork_nt(uint32_t dwCreationFlags) {
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jmp_buf jb;
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uint32_t oldprot;
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char ok, threaded;
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char **args, **args2;
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struct CosmoTib *tib;
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char16_t pipename[64];
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int64_t reader, writer;
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struct NtStartupInfo startinfo;
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int i, n, pid, untrackpid, rc = -1;
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char *p, forkvar[6 + 21 + 1 + 21 + 1];
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struct NtProcessInformation procinfo;
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threaded = __threaded;
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tib = __tls_enabled ? __get_tls() : 0;
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if (!setjmp(jb)) {
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pid = untrackpid = __reservefd_unlocked(-1);
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reader = CreateNamedPipe(CreatePipeName(pipename),
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kNtPipeAccessInbound | kNtFileFlagOverlapped,
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kNtPipeTypeMessage | kNtPipeReadmodeMessage, 1,
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65536, 65536, 0, &kNtIsInheritable);
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writer = CreateFile(pipename, kNtGenericWrite, 0, 0, kNtOpenExisting,
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kNtFileFlagOverlapped, 0);
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if (pid != -1 && reader != -1 && writer != -1) {
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p = stpcpy(forkvar, "_FORK=");
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p = FormatUint64(p, reader);
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bzero(&startinfo, sizeof(startinfo));
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startinfo.cb = sizeof(struct NtStartupInfo);
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startinfo.dwFlags = kNtStartfUsestdhandles;
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startinfo.hStdInput = __getfdhandleactual(0);
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startinfo.hStdOutput = __getfdhandleactual(1);
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startinfo.hStdError = __getfdhandleactual(2);
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args = __argv;
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#ifdef SYSDEBUG
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// If --strace was passed to this program, then propagate it the
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// forked process since the flag was removed by __intercept_flag
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if (strace_enabled(0) > 0) {
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for (n = 0; args[n];) ++n;
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args2 = alloca((n + 2) * sizeof(char *));
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for (i = 0; i < n; ++i) args2[i] = args[i];
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args2[i++] = "--strace";
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args2[i] = 0;
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args = args2;
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}
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#endif
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if (ntspawn(GetProgramExecutableName(), args, environ, forkvar, 0, 0,
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true, dwCreationFlags, 0, &startinfo, &procinfo) != -1) {
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CloseHandle(procinfo.hThread);
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ok = WriteAll(writer, jb, sizeof(jb)) &&
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WriteAll(writer, &_mmi.i, sizeof(_mmi.i)) &&
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WriteAll(writer, &_mmi.n, sizeof(_mmi.n)) &&
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WriteAll(writer, _mmi.p, _mmi.i * sizeof(_mmi.p[0]));
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if (IsAsan() && ok) {
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ok = WriteAll(writer, (char *)(((intptr_t)_mmi.p >> 3) + 0x7fff8000),
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(_mmi.i * sizeof(_mmi.p[0])) >> 3);
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}
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for (i = 0; i < _mmi.i && ok; ++i) {
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if ((_mmi.p[i].flags & MAP_TYPE) != MAP_SHARED) {
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ok = WriteAll(writer, (void *)((uint64_t)_mmi.p[i].x << 16),
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_mmi.p[i].size);
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}
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}
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if (ok) ok = WriteAll(writer, __data_start, __data_end - __data_start);
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if (ok) ok = WriteAll(writer, __bss_start, __bss_end - __bss_start);
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if (ok) {
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if (!CloseHandle(writer)) ok = false;
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writer = -1;
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}
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if (ok) {
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g_fds.p[pid].kind = kFdProcess;
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g_fds.p[pid].handle = procinfo.hProcess;
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g_fds.p[pid].flags = O_CLOEXEC;
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g_fds.p[pid].zombie = false;
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untrackpid = -1;
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rc = pid;
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} else {
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TerminateProcess(procinfo.hProcess, 127);
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CloseHandle(procinfo.hProcess);
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}
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}
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}
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if (reader != -1) CloseHandle(reader);
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if (writer != -1) CloseHandle(writer);
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if (rc == -1 && errno != ENOMEM) {
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eagain(); // posix fork() only specifies two errors
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}
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} else {
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rc = 0;
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// re-apply code morphing for thread-local storage
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if (tib && _weaken(__set_tls) && _weaken(__morph_tls)) {
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_weaken(__set_tls)(tib);
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_weaken(__morph_tls)();
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__tls_enabled_set(true);
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}
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// re-apply code morphing for synchronization nops
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if (threaded && !__threaded && _weaken(__enable_threads)) {
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_weaken(__enable_threads)();
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}
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// re-apply code morphing for function tracing
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if (ftrace_stackdigs) {
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_weaken(__hook)(_weaken(ftrace_hook), _weaken(GetSymbolTable)());
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}
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}
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if (untrackpid != -1) {
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__releasefd(untrackpid);
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}
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return rc;
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}
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#endif /* __x86_64__ */
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