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https://github.com/jart/cosmopolitan.git
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6ffed14b9c
Actually Portable Executable now supports Android. Cosmo's old mmap code required a 47 bit address space. The new implementation is very agnostic and supports both smaller address spaces (e.g. embedded) and even modern 56-bit PML5T paging for x86 which finally came true on Zen4 Threadripper Cosmopolitan no longer requires UNIX systems to observe the Windows 64kb granularity; i.e. sysconf(_SC_PAGE_SIZE) will now report the host native page size. This fixes a longstanding POSIX conformance issue, concerning file mappings that overlap the end of file. Other aspects of conformance have been improved too, such as the subtleties of address assignment and and the various subtleties surrounding MAP_FIXED and MAP_FIXED_NOREPLACE On Windows, mappings larger than 100 megabytes won't be broken down into thousands of independent 64kb mappings. Support for MAP_STACK is removed by this change; please use NewCosmoStack() instead. Stack overflow avoidance is now being implemented using the POSIX thread APIs. Please use GetStackBottom() and GetStackAddr(), instead of the old error-prone GetStackAddr() and HaveStackMemory() APIs which are removed.
66 lines
3.5 KiB
C
66 lines
3.5 KiB
C
/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
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│ vi: set et 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/calls.h"
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#include "libc/calls/syscall-sysv.internal.h"
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#include "libc/dce.h"
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#include "libc/errno.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/intrin/directmap.internal.h"
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#include "libc/intrin/strace.internal.h"
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#include "libc/nt/runtime.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/syslib.internal.h"
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#include "libc/sysv/errfuns.h"
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/**
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* Obtains memory mapping directly from system.
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*
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* The mmap() function needs to track memory mappings in order to
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* support Windows NT and Address Sanitizer. That memory tracking can be
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* bypassed by calling this function. However the caller is responsible
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* for passing the magic memory handle on Windows NT to CloseHandle().
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*
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* @asyncsignalsafe
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*/
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struct DirectMap sys_mmap(void *addr, size_t size, int prot, int flags, int fd,
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int64_t off) {
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struct DirectMap d;
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if ((__virtualsize += size) >= __virtualmax) {
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d.maphandle = kNtInvalidHandleValue;
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d.addr = (void *)enomem();
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} else if (IsXnuSilicon()) {
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long p = _sysret(__syslib->__mmap(addr, size, prot, flags, fd, off));
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d.maphandle = kNtInvalidHandleValue;
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d.addr = (void *)p;
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} else if (!IsWindows() && !IsMetal()) {
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d.addr = __sys_mmap(addr, size, prot, flags, fd, off, off);
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d.maphandle = kNtInvalidHandleValue;
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} else if (IsMetal()) {
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d = sys_mmap_metal(addr, size, prot, flags, fd, off);
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} else {
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d = sys_mmap_nt(addr, size, prot, flags, fd, off);
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}
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if (d.addr == MAP_FAILED)
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__virtualsize -= size;
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KERNTRACE("sys_mmap(%.12p, %'zu, %s, %s, %d, %'ld) → {%.12p, %p}% m", addr,
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size, DescribeProtFlags(prot), DescribeMapFlags(flags), fd, off,
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d.addr, d.maphandle);
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return d;
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}
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