mirror of
https://github.com/jart/cosmopolitan.git
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84 lines
3.8 KiB
C
84 lines
3.8 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/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/runtime.h"
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#include "libc/runtime/directmap.internal.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/prot.h"
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textwindows noasan struct DirectMap sys_mmap_nt(void *addr, size_t size,
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int prot, int flags,
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int64_t handle, int64_t off) {
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size_t i;
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struct DirectMap dm;
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uint32_t flags1, flags2;
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const struct NtSecurityAttributes *sec;
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if (flags & MAP_PRIVATE) {
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sec = 0; // MAP_PRIVATE isn't inherited across fork()
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} else {
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sec = &kNtIsInheritable; // MAP_SHARED gives us zero-copy fork()
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}
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if ((prot & PROT_WRITE) && (flags & MAP_PRIVATE) && handle != -1) {
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// windows has cow pages but they can't propagate across fork()
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if (prot & PROT_EXEC) {
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flags1 = kNtPageExecuteWritecopy;
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flags2 = kNtFileMapCopy | kNtFileMapExecute;
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} else {
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flags1 = kNtPageWritecopy;
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flags2 = kNtFileMapCopy;
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}
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} else if (prot & PROT_WRITE) {
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if (prot & PROT_EXEC) {
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flags1 = kNtPageExecuteReadwrite;
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flags2 = kNtFileMapWrite | kNtFileMapExecute;
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} else {
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flags1 = kNtPageReadwrite;
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flags2 = kNtFileMapWrite;
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}
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} else if (prot & PROT_READ) {
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if (prot & PROT_EXEC) {
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flags1 = kNtPageExecuteRead;
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flags2 = kNtFileMapRead | kNtFileMapExecute;
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} else {
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flags1 = kNtPageReadonly;
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flags2 = kNtFileMapRead;
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}
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} else {
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flags1 = kNtPageNoaccess;
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flags2 = 0;
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}
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if ((dm.maphandle = CreateFileMapping(handle, sec, flags1, (size + off) >> 32,
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(size + off), 0))) {
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if ((dm.addr = MapViewOfFileEx(dm.maphandle, flags2, off >> 32, off, size,
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addr))) {
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return dm;
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}
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CloseHandle(dm.maphandle);
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}
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dm.maphandle = kNtInvalidHandleValue;
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dm.addr = (void *)(intptr_t)-1;
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return dm;
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}
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