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https://github.com/jart/cosmopolitan.git
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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
95 lines
4.5 KiB
C
95 lines
4.5 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/assert.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/state.internal.h"
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#include "libc/intrin/directmap.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/nt/struct/processmemorycounters.h"
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#include "libc/nt/struct/securityattributes.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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textwindows struct DirectMap sys_mmap_nt(void *addr, size_t size, int prot,
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int flags, int fd, int64_t off) {
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int iscow;
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int64_t handle;
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uint32_t oldprot;
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struct DirectMap dm;
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struct ProtectNt fl;
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const struct NtSecurityAttributes *sec;
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if (flags & MAP_ANONYMOUS) {
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handle = kNtInvalidHandleValue;
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} else {
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handle = g_fds.p[fd].handle;
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}
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if ((flags & MAP_TYPE) != MAP_SHARED) {
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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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// nt will whine under many circumstances if we change the execute bit
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// later using mprotect(). the workaround is to always request execute
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// and then virtualprotect() it away until we actually need it. please
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// note that open-nt.c always requests an kNtGenericExecute accessmask
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iscow = false;
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if (handle != -1) {
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if ((flags & MAP_TYPE) != MAP_SHARED) {
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// windows has cow pages but they can't propagate across fork()
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// that means we only get copy-on-write for the root process :(
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fl = (struct ProtectNt){kNtPageExecuteWritecopy,
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kNtFileMapCopy | kNtFileMapExecute};
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iscow = true;
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} else {
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if ((g_fds.p[fd].flags & O_ACCMODE) == O_RDONLY) {
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fl = (struct ProtectNt){kNtPageExecuteRead,
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kNtFileMapRead | kNtFileMapExecute};
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} else {
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fl = (struct ProtectNt){kNtPageExecuteReadwrite,
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kNtFileMapWrite | kNtFileMapExecute};
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}
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}
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} else {
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unassert(flags & MAP_ANONYMOUS);
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fl = (struct ProtectNt){kNtPageExecuteReadwrite,
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kNtFileMapWrite | kNtFileMapExecute};
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}
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if ((dm.maphandle = CreateFileMapping(handle, sec, fl.flags1,
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(size + off) >> 32, (size + off), 0))) {
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if ((dm.addr = MapViewOfFileEx(dm.maphandle, fl.flags2, off >> 32, off,
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size, addr))) {
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if (VirtualProtect(addr, size, __prot2nt(prot, iscow), &oldprot)) {
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return dm;
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}
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UnmapViewOfFile(dm.addr);
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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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