mirror of
https://github.com/jart/cosmopolitan.git
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dc0ea6640e
This change makes further effort towards improving our poll() implementation on the New Technology. The stdin worker didn't work out so well for Python so it's not being used for now. System call tracing with the --strace flag should now be less noisy now on Windows unless you modify the strace.internal.h defines to turn on some optional ones that are most useful for debugging the system call wrappers.
210 lines
7.3 KiB
C
210 lines
7.3 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 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/bits/likely.h"
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#include "libc/bits/weaken.h"
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#include "libc/calls/calls.h"
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#include "libc/calls/internal.h"
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#include "libc/calls/strace.internal.h"
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#include "libc/dce.h"
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#include "libc/intrin/asan.internal.h"
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#include "libc/intrin/describeflags.internal.h"
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#include "libc/macros.internal.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/runtime/memtrack.internal.h"
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#include "libc/runtime/runtime.h"
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#include "libc/sysv/consts/map.h"
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#include "libc/sysv/consts/mremap.h"
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#include "libc/sysv/errfuns.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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#define ALIGNED(p) (!(IP(p) & (FRAMESIZE - 1)))
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#define ADDR(x) ((int64_t)((uint64_t)(x) << 32) >> 16)
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#define SHADE(x) (((intptr_t)(x) >> 3) + 0x7fff8000)
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#define FRAME(x) ((int)((intptr_t)(x) >> 16))
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static size_t GetMapSize(size_t i, size_t *j) {
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size_t n;
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n = (size_t)(_mmi.p[i].y - _mmi.p[i].x + 1) << 16;
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while (i + 1 < _mmi.i) {
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if (_mmi.p[i + 1].x != _mmi.p[i].y + 1) break;
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++i;
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n += (size_t)(_mmi.p[i].y - _mmi.p[i].x + 1) << 16;
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}
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*j = i;
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return n;
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}
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static bool MustMoveMap(intptr_t y, size_t j) {
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return ADDR(_mmi.p[j].y) + FRAMESIZE > y ||
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(j + 1 < _mmi.i && ADDR(_mmi.p[j + 1].x) < y);
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}
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/**
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* Extends and/or relocates memory pages.
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*
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* @param p is old address
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* @param n is old size
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* @param m is new size
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* @param f should have MREMAP_MAYMOVE and may have MAP_FIXED
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* @param q is new address
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*/
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void *mremap(void *p, size_t n, size_t m, int f, ... /* void *q */) {
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enosys();
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return MAP_FAILED;
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#if 0
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va_list va;
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void *res, *q;
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if (f & MREMAP_FIXED) {
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va_start(va, f);
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q = va_arg(va, void *);
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va_end(va);
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} else {
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q = 0;
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}
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enosys();
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res = MAP_FAILED;
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STRACE("mremap(%p, %'zu, %'zu, %s, %p) → %p% m", p, n, m,
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DescribeRemapFlags(f), q, res);
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return res;
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// TODO(jart): perhaps some day?
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// probably not a big perf gain at this point :|
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size_t i, j, k;
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struct DirectMap dm;
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int a, b, prot, flags;
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assert(!__vforked);
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if (UNLIKELY(!m)) {
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STRACE("m=0");
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return VIP(einval());
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} else if (UNLIKELY(!n)) {
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STRACE("n=0");
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return VIP(eopnotsupp());
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} else if (UNLIKELY(!ALIGNED(n))) {
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STRACE("n align");
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return VIP(eopnotsupp());
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} else if (UNLIKELY(!ALIGNED(m))) {
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STRACE("n align");
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return VIP(eopnotsupp());
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} else if (UNLIKELY(!ALIGNED(p))) {
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STRACE("64kb align");
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return VIP(einval());
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} else if (UNLIKELY(!IsLegalSize(n))) {
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STRACE("n too big");
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return VIP(enomem());
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} else if (UNLIKELY(!IsLegalSize(m))) {
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STRACE("m too big");
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return VIP(enomem());
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} else if (f & ~(MREMAP_MAYMOVE | MREMAP_FIXED)) {
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STRACE("bad flag");
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return VIP(einval());
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} else if (!IsMemtracked(FRAME(p), FRAME((intptr_t)p + (n - 1)))) {
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STRACE("interval not tracked");
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return VIP(efault());
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}
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STRACE("mremap(%p, %'zu, %'zu, %#b)", p, n, m, f);
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i = FindMemoryInterval(&_mmi, FRAME(p));
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if (i >= _mmi.i) return VIP(efault());
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flags = _mmi.p[i].flags;
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if (!(flags & MAP_ANONYMOUS)) {
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return VIP(eopnotsupp()); /* TODO */
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}
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if (f & MREMAP_FIXED) {
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if (!ALIGNED(q)) return VIP(einval());
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return VIP(eopnotsupp()); /* TODO */
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}
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prot = _mmi.p[i].prot;
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for (k = i + 1; k <= j; ++k) {
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prot |= _mmi.p[k].prot;
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if (_mmi.p[k].flags != flags) {
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return VIP(enomem());
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}
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}
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if (m == n) {
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return p;
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} else if (m < n) {
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if (munmap((char *)p + n, m - n) != -1) {
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return p;
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} else {
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return MAP_FAILED;
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}
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} else if (!MustMoveMap(j, (intptr_t)p + n)) {
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dm = sys_mmap((char *)p + n, m - n, prot, flags | MAP_FIXED, -1, 0);
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if (dm.addr == MAP_FAILED) return 0;
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if (TrackMemoryInterval(&_mmi, ((uintptr_t)p + n) >> 16,
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((uintptr_t)p + m - FRAMESIZE) >> 16, dm.maphandle,
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prot, flags, false, false, 0, m - n) != -1) {
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if (weaken(__asan_map_shadow)) {
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weaken(__asan_map_shadow)((uintptr_t)dm.addr, m - n);
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}
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return p;
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} else {
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abort();
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}
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} else if (!(f & MREMAP_MAYMOVE)) {
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return VIP(enomem());
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} else if (IsLinux()) {
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a = (uint32_t)(kAutomapStart >> 16);
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i = FindMemoryInterval(&_mmi, a);
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if (i < _mmi.i) {
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for (; i + 1 < _mmi.i; ++i) {
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if (((size_t)(_mmi.p[i + 1].x - _mmi.p[i].y - 1) << 16) >= m) {
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break;
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}
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}
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if (__builtin_add_overflow(_mmi.p[i].y, 1, &a)) {
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return VIP(enomem());
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}
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}
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if (__builtin_add_overflow(a, (int)((m >> 16) - 1), &b)) {
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return VIP(enomem());
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}
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q = sys_mremap((void *)p, n, m, MREMAP_MAYMOVE | MREMAP_FIXED,
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(void *)ADDR(a));
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KERNTRACE("sys_mremap(%p, %'zu, %'zu, %#b, %p) → %p", p, n, m,
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MREMAP_MAYMOVE | MREMAP_FIXED, ADDR(a), q);
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if (q == MAP_FAILED) return 0;
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if (ReleaseMemoryIntervals(&_mmi, (uintptr_t)p >> 16,
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((uintptr_t)p + n - FRAMESIZE) >> 16, 0) != -1 &&
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TrackMemoryInterval(&_mmi, a, b, -1, prot, flags, false, false, 0, m) !=
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-1) {
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if (weaken(__asan_poison)) {
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if (!OverlapsShadowSpace(p, n)) {
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weaken(__asan_poison)((intptr_t)p, n, kAsanUnmapped);
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}
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if (!OverlapsShadowSpace(q, m)) {
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weaken(__asan_map_shadow)((intptr_t)q, m);
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}
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}
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return (void *)ADDR(a);
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} else {
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abort();
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}
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} else if ((q = mmap(0, m, prot, flags, -1, 0)) != MAP_FAILED) {
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memcpy(q, p, n);
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munmap(p, n);
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return q;
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} else {
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return q;
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}
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#endif
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}
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