mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-02-07 15:03:34 +00:00
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
4.1 KiB
C
95 lines
4.1 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 2022 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/calls.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/intrin/asancodes.h"
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#include "libc/intrin/directmap.internal.h"
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#include "libc/macros.internal.h"
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#include "libc/runtime/memtrack.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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#define G FRAMESIZE
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static void *_mapframe(void *p, int f) {
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int rc, prot, flags;
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struct DirectMap dm;
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prot = PROT_READ | PROT_WRITE;
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flags = f | MAP_ANONYMOUS | MAP_FIXED;
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if ((dm = sys_mmap(p, G, prot, flags, -1, 0)).addr == p) {
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__mmi_lock();
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rc = TrackMemoryInterval(&_mmi, (uintptr_t)p >> 16, (uintptr_t)p >> 16,
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dm.maphandle, prot, flags, false, false, 0, G);
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__mmi_unlock();
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if (!rc) {
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return p;
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} else {
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unassert(errno == ENOMEM);
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return 0;
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}
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} else {
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unassert(errno == ENOMEM);
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return 0;
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}
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}
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/**
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* Extends static allocation.
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*
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* This simple fixed allocator has unusual invariants
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*
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* !(p & 0xffff) && !(((p >> 3) + 0x7fff8000) & 0xffff)
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*
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* which must be the case when selecting a starting address. We also
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* make the assumption that allocations can only grow monotonically.
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* Furthermore allocations shall never be removed or relocated.
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*
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* @param p points to start of memory region
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* @param n specifies how many bytes are needed
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* @param e points to end of memory that's allocated
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* @param h is highest address to which `e` may grow
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* @param f should be `MAP_PRIVATE` or `MAP_SHARED`
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* @return new value for `e` or null w/ errno
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* @raise ENOMEM if we require more vespene gas
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*/
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dontasan void *_extend(void *p, size_t n, void *e, int f, intptr_t h) {
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char *q;
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unassert(!((uintptr_t)SHADOW(p) & (G - 1)));
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unassert((uintptr_t)p + (G << kAsanScale) <= h);
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// TODO(jart): Make this spin less in non-ASAN mode.
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for (q = e; q < ((char *)p + n); q += 8) {
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if (!((uintptr_t)q & (G - 1))) {
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unassert(q + G <= (char *)h);
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if (!_mapframe(q, f)) return 0;
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if (IsAsan()) {
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if (!((uintptr_t)SHADOW(q) & (G - 1))) {
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if (!_mapframe(SHADOW(q), f)) return 0;
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__asan_poison(q, G << kAsanScale, kAsanProtected);
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}
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}
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}
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if (IsAsan()) {
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*SHADOW(q) = 0;
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}
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}
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return q;
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}
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