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https://github.com/jart/cosmopolitan.git
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ff250a0c10
This reverts commit b01282e23e. Some tests
are broken. It's not clear how it'll impact metal yet. Let's revisit the
memory optimization benefits of this change again sometime soon.
103 lines
4.3 KiB
C
103 lines
4.3 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 2023 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/calls.h"
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#include "libc/calls/struct/iovec.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/runtime/internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/runtime/zipos.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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#include "libc/sysv/consts/s.h"
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#include "libc/sysv/errfuns.h"
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#include "libc/zip.internal.h"
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#define IP(X) (intptr_t)(X)
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#define VIP(X) (void *)IP(X)
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/**
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* Map zipos file into memory. See mmap.
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*
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* @param addr should be 0 or a compatible address
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* @param size must be >0 and will be rounded up to FRAMESIZE
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* automatically.
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* @param prot can have PROT_READ/PROT_WRITE/PROT_EXEC/PROT_NONE/etc.
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* @param flags cannot have `MAP_SHARED` or `MAP_ANONYMOUS`, there is
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* no actual file backing for zipos files. `MAP_SHARED` could be
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* simulated for non-writable mappings, but that would require
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* tracking zipos mappings to prevent making it PROT_WRITE.
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* @param h is a zip store object
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* @param off specifies absolute byte index of h's file for mapping,
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* it does not need to be 64kb aligned.
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* @return virtual base address of new mapping, or MAP_FAILED w/ errno
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*/
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void *__zipos_mmap(void *addr, size_t size, int prot, int flags,
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struct ZiposHandle *h, int64_t off) {
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if (off < 0) {
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STRACE("negative zipos mmap offset");
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return VIP(einval());
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}
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if (h->cfile == ZIPOS_SYNTHETIC_DIRECTORY ||
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S_ISDIR(GetZipCfileMode(h->zipos->map + h->cfile))) {
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return VIP(eisdir());
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}
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if (flags & (MAP_SHARED | MAP_ANONYMOUS)) {
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STRACE("ZipOS bad flags");
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return VIP(einval());
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}
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if (prot & ~(PROT_READ | PROT_WRITE | PROT_EXEC)) {
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STRACE("ZipOS bad protection");
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return VIP(einval());
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}
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flags &= MAP_FIXED | MAP_FIXED_NOREPLACE;
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flags |= MAP_PRIVATE | MAP_ANONYMOUS;
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const int tempProt = !IsXnu() ? prot | PROT_WRITE : PROT_WRITE;
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void *outAddr = __mmap_unlocked(addr, size, tempProt, flags, -1, 0);
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if (outAddr == MAP_FAILED) {
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return MAP_FAILED;
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}
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do {
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if (__zipos_read(h, &(struct iovec){outAddr, size}, 1, off) == -1) {
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strace_enabled(-1);
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break;
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} else if (prot != tempProt) {
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strace_enabled(-1);
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if (mprotect(outAddr, size, prot) == -1) {
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break;
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}
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strace_enabled(+1);
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}
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return outAddr;
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} while (0);
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const int e = errno;
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__munmap_unlocked(outAddr, size);
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errno = e;
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strace_enabled(+1);
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return MAP_FAILED;
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}
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