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https://github.com/jart/cosmopolitan.git
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6f658f058b
We defined `noinline` as an abbreviation for the longer version `__attribute__((__noinline__))` which caused name clashes since third party codebases often write it as `__attribute__((noinline))`.
306 lines
12 KiB
C
306 lines
12 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/sysdebug.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/asan.internal.h"
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#include "libc/log/backtrace.internal.h"
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#include "libc/log/libfatal.internal.h"
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#include "libc/log/log.h"
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#include "libc/macros.internal.h"
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#include "libc/rand/rand.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/str/str.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/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 SMALL(n) ((n) <= 0xffffffffffff)
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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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forceinline wontreturn void Die(void) {
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if (weaken(__die)) weaken(__die)();
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abort();
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}
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noasan static bool IsMapped(char *p, size_t n) {
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return OverlapsImageSpace(p, n) || IsMemtracked(FRAME(p), FRAME(p + (n - 1)));
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}
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noasan static bool NeedAutomap(char *p, size_t n) {
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return !p || OverlapsArenaSpace(p, n) || OverlapsShadowSpace(p, n) ||
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IsMapped(p, n);
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}
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noasan static bool ChooseInterval(int x, int n, int *res) {
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int i;
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if (_mmi.i) {
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i = FindMemoryInterval(&_mmi, x);
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if (i < _mmi.i) {
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if (x + n < _mmi.p[i].x) {
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*res = x;
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return true;
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}
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while (++i < _mmi.i) {
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if (_mmi.p[i].x - _mmi.p[i - 1].y > n) {
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*res = _mmi.p[i - 1].y + 1;
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return true;
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}
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}
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}
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if (INT_MAX - _mmi.p[i - 1].y >= n) {
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*res = _mmi.p[i - 1].y + 1;
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return true;
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}
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return false;
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} else {
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*res = x;
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return true;
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}
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}
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noasan static bool Automap(int n, int *res) {
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*res = -1;
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if (ChooseInterval(FRAME(kAutomapStart), n, res)) {
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assert(*res >= FRAME(kAutomapStart));
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if (*res + n <= FRAME(kAutomapStart + (kAutomapStart - 1))) {
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return true;
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} else {
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SYSDEBUG("mmap(0x%p, 0x%x) ENOMEM (automap interval exhausted)",
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ADDR(*res), ADDR(n + 1));
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return false;
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}
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} else {
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SYSDEBUG("mmap(0x%p, 0x%x) ENOMEM (automap failed)", ADDR(*res),
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ADDR(n + 1));
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return false;
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}
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}
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static noasan void *MapMemory(void *addr, size_t size, int prot, int flags,
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int fd, int64_t off, int f, int x, int n) {
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struct DirectMap dm;
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dm = sys_mmap(addr, size, prot, f, fd, off);
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if (UNLIKELY(dm.addr == MAP_FAILED)) {
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if (IsWindows() && (flags & MAP_FIXED)) {
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SYSDEBUG("mmap(0x%p, 0x%x) -> %s (%s)", addr, size, strerror(errno),
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"can't recover from MAP_FIXED errors on Windows");
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assert(!"MapMemory() failed");
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Die();
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}
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return MAP_FAILED;
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}
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if (UNLIKELY(dm.addr != addr)) {
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SYSDEBUG("KERNEL DIDN'T RESPECT MAP_FIXED");
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assert(!"MapMemory() failed");
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Die();
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}
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if (!IsWindows() && (flags & MAP_FIXED)) {
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if (UntrackMemoryIntervals(addr, size)) {
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SYSDEBUG("FIXED UNTRACK FAILED %s", strerror(errno));
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assert(!"MapMemory() failed");
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Die();
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}
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}
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if (TrackMemoryInterval(&_mmi, x, x + (n - 1), dm.maphandle, prot, flags)) {
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if (sys_munmap(addr, n) == -1) {
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SYSDEBUG("TRACK MUNMAP FAILED %s", strerror(errno));
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assert(!"MapMemory() failed");
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Die();
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}
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return MAP_FAILED;
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}
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if (weaken(__asan_map_shadow) && !OverlapsShadowSpace(addr, size)) {
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weaken(__asan_map_shadow)((intptr_t)addr, size);
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}
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return addr;
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}
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/**
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* Maps memory from system, one frame at a time.
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*
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* This is useful on Windows since it allows us to partially unmap or
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* punch holes into existing mappings.
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*/
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static textwindows dontinline noasan void *MapMemories(char *addr, size_t size,
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int prot, int flags,
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int fd, int64_t off, int f,
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int x, size_t n) {
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struct DirectMap dm;
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size_t i, m = (n - 1) * FRAMESIZE;
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assert(m < size && m + FRAMESIZE >= size);
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dm = sys_mmap(addr + m, size - m, prot, f, fd, fd == -1 ? 0 : off + m);
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if (dm.addr == MAP_FAILED) {
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SYSDEBUG("MapMemories(%p+%x/%x) %s", addr, m, size, strerror(errno));
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return MAP_FAILED;
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}
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if (TrackMemoryInterval(&_mmi, x + (n - 1), x + (n - 1), dm.maphandle, prot,
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flags) == -1) {
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SYSDEBUG("MapMemories(%p+%x/%x) unrecoverable failure #1 %s", addr, m, size,
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strerror(errno));
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assert(!"MapMemories() failed");
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Die();
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}
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for (i = 0; i < m; i += FRAMESIZE) {
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dm = sys_mmap(addr + i, FRAMESIZE, prot, f, fd, fd == -1 ? 0 : off + i);
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if (dm.addr == MAP_FAILED ||
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TrackMemoryInterval(&_mmi, x + i / FRAMESIZE, x + i / FRAMESIZE,
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dm.maphandle, prot, flags) == -1) {
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SYSDEBUG("MapMemories(%p+%x/%x) unrecoverable failure #2 %s", addr, i,
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size, strerror(errno));
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assert(!"MapMemories() failed");
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Die();
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}
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}
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if (weaken(__asan_map_shadow) && !OverlapsShadowSpace(addr, size)) {
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weaken(__asan_map_shadow)((intptr_t)addr, size);
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}
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return addr;
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}
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/**
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* Beseeches system for page-table entries, e.g.
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*
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* char *m;
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* m = mmap(NULL, FRAMESIZE, PROT_READ | PROT_WRITE,
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* MAP_PRIVATE | MAP_ANONYMOUS, -1, 0);
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* munmap(m, FRAMESIZE);
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*
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* @param addr should be 0 to let your memory manager choose address;
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* unless MAP_FIXED or MAP_FIXED_NOREPLACE are specified in flags
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* in which case this function will do precicely as you ask, even
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* if p=0 (in which you need -fno-delete-null-pointer-checks); it
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* needs to be 64kb aligned because it's a wise choice that sadly
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* needs to be made mandatory because of Windows although you can
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* use __sys_mmap() to circumvent it on System Five in which case
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* runtime support services, e.g. asan memory safety, could break
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* @param size must be >0 and needn't be a multiple of FRAMESIZE, but
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* will be rounded up to FRAMESIZE automatically if MAP_ANONYMOUS
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* is specified
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* @param prot can have PROT_READ/PROT_WRITE/PROT_EXEC/PROT_NONE/etc.
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* @param flags can have MAP_ANONYMOUS, MAP_SHARED, MAP_PRIVATE, etc.
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* @param fd is an open()'d file descriptor, whose contents shall be
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* made available w/ automatic reading at the chosen address and
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* must be -1 if MAP_ANONYMOUS is specified
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* @param off specifies absolute byte index of fd's file for mapping,
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* should be zero if MAP_ANONYMOUS is specified, and sadly needs
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* to be 64kb aligned too
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* @return virtual base address of new mapping, or MAP_FAILED w/ errno
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*/
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noasan void *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 dm;
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int a, b, i, f, m, n, x;
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char mode[8], *p = addr;
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if (UNLIKELY(!size)) {
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SYSDEBUG("mmap(0x%p, 0x%x) EINVAL (size=0)", p, size);
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return VIP(einval());
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}
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if (UNLIKELY(!SMALL(size))) {
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SYSDEBUG("mmap(0x%p, 0x%x) EINVAL (size isn't 48-bit)", p, size);
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return VIP(einval());
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}
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if (UNLIKELY(!IsLegalPointer(p))) {
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SYSDEBUG("mmap(0x%p, 0x%x) EINVAL (p isn't 48-bit)", p, size);
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return VIP(einval());
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}
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if (UNLIKELY(!ALIGNED(p))) {
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SYSDEBUG("mmap(0x%p, 0x%x) EINVAL (p isn't 64kb aligned)", p, size);
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return VIP(einval());
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}
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if (UNLIKELY(fd < -1)) {
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SYSDEBUG("mmap(0x%p, 0x%x, fd=%d) EBADF", p, size, (long)fd);
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return VIP(ebadf());
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}
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if (UNLIKELY(!((fd != -1) ^ !!(flags & MAP_ANONYMOUS)))) {
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SYSDEBUG("mmap(0x%p, 0x%x, %s, %d, %d) EINVAL (fd anonymous mismatch)", p,
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size, DescribeMapping(prot, flags, mode), (long)fd, off);
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return VIP(einval());
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}
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if (UNLIKELY(!(!!(flags & MAP_PRIVATE) ^ !!(flags & MAP_SHARED)))) {
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SYSDEBUG("mmap(0x%p, 0x%x) EINVAL (MAP_SHARED ^ MAP_PRIVATE)", p, size);
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return VIP(einval());
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}
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if (UNLIKELY(off < 0)) {
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SYSDEBUG("mmap(0x%p, 0x%x, off=%d) EINVAL (neg off)", p, size, off);
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return VIP(einval());
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}
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if (UNLIKELY(INT64_MAX - size < off)) {
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SYSDEBUG("mmap(0x%p, 0x%x, off=%d) EINVAL (too large)", p, size, off);
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return VIP(einval());
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}
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if (UNLIKELY(!ALIGNED(off))) {
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SYSDEBUG("mmap(0x%p, 0x%x) EINVAL (p isn't 64kb aligned)", p, size);
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return VIP(einval());
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}
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if ((flags & MAP_FIXED_NOREPLACE) && IsMapped(p, size)) {
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if (OverlapsImageSpace(p, size)) {
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SYSDEBUG("mmap(0x%p, 0x%x) EFAULT (overlaps image)", p, size);
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} else {
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SYSDEBUG("mmap(0x%p, 0x%x) EFAULT (overlaps existing)", p, size);
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}
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return VIP(efault());
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}
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SYSDEBUG("mmap(0x%p, 0x%x, %s, %d, %d)", p, size,
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DescribeMapping(prot, flags, mode), (long)fd, off);
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if (fd == -1) {
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size = ROUNDUP(size, FRAMESIZE);
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if (IsWindows()) {
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prot |= PROT_WRITE; /* kludge */
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}
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}
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n = FRAME(size) + !!(size & (FRAMESIZE - 1));
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f = (flags & ~MAP_FIXED_NOREPLACE) | MAP_FIXED;
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if (flags & MAP_FIXED) {
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x = FRAME(p);
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if (IsWindows()) {
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if (UntrackMemoryIntervals(p, size)) {
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SYSDEBUG("FIXED UNTRACK FAILED %s", strerror(errno));
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assert(!"mmap() failed");
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Die();
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}
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}
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} else if (!NeedAutomap(p, size)) {
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x = FRAME(p);
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} else if (!Automap(n, &x)) {
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return VIP(enomem());
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}
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p = (char *)ADDR(x);
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if (IsOpenbsd() && (f & MAP_GROWSDOWN)) { /* openbsd:dubstack */
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dm = sys_mmap(p, size, prot, f & ~MAP_GROWSDOWN, fd, off);
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if (dm.addr == MAP_FAILED) return MAP_FAILED;
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}
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if (!IsWindows()) {
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return MapMemory(p, size, prot, flags, fd, off, f, x, n);
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} else {
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return MapMemories(p, size, prot, flags, fd, off, f, x, n);
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}
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}
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