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https://github.com/jart/cosmopolitan.git
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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
114 lines
4.6 KiB
C
114 lines
4.6 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 2021 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/internal.h"
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#include "libc/calls/metalfile.internal.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/pc.internal.h"
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#include "libc/str/str.h"
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#include "libc/sysv/consts/prot.h"
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#include "libc/sysv/errfuns.h"
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#ifdef __x86_64__
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#define MAP_ANONYMOUS_linux 0x00000020
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#define MAP_FIXED_linux 0x00000010
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static uint64_t sys_mmap_metal_break;
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dontasan static struct DirectMap bad_mmap(void) {
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struct DirectMap res;
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res.addr = (void *)-1;
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res.maphandle = -1;
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return res;
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}
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dontasan struct DirectMap sys_mmap_metal(void *vaddr, size_t size, int prot,
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int flags, int fd, int64_t off) {
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/* asan runtime depends on this function */
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size_t i;
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struct mman *mm;
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struct DirectMap res;
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uint64_t addr, faddr = 0, page, e, *pte, *fdpte, *pml4t;
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mm = __get_mm();
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pml4t = __get_pml4t();
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size = ROUNDUP(size, 4096);
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addr = (uint64_t)vaddr;
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if (!(flags & MAP_ANONYMOUS_linux)) {
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struct Fd *sfd;
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struct MetalFile *file;
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if (off < 0 || fd < 0 || fd >= g_fds.n) return bad_mmap();
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sfd = &g_fds.p[fd];
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if (sfd->kind != kFdFile) return bad_mmap();
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file = (struct MetalFile *)sfd->handle;
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/* TODO: allow mapping partial page at end of file, if file size not
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* multiple of page size */
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if (off > file->size || size > file->size - off) return bad_mmap();
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faddr = (uint64_t)file->base + off;
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if (faddr % 4096 != 0) return bad_mmap();
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}
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if (!(flags & MAP_FIXED_linux)) {
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if (!addr) {
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addr = 4096;
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} else {
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addr = ROUNDUP(addr, 4096);
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}
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for (i = 0; i < size; i += 4096) {
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pte = __get_virtual(mm, pml4t, addr + i, false);
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if (pte && (*pte & (PAGE_V | PAGE_RSRV))) {
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addr = MAX(addr, sys_mmap_metal_break) + i + 4096;
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i = 0;
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}
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}
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sys_mmap_metal_break = MAX(addr + size, sys_mmap_metal_break);
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}
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for (i = 0; i < size; i += 4096) {
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pte = __get_virtual(mm, pml4t, addr + i, true);
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if (pte) {
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if ((flags & MAP_ANONYMOUS_linux)) {
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page = __new_page(mm);
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if (!page) return bad_mmap();
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__clear_page(BANE + page);
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e = page | PAGE_RSRV | PAGE_U;
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if ((prot & PROT_WRITE))
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e |= PAGE_V | PAGE_RW;
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else if ((prot & (PROT_READ | PROT_EXEC)))
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e |= PAGE_V;
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if (!(prot & PROT_EXEC)) e |= PAGE_XD;
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} else {
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fdpte = __get_virtual(mm, pml4t, faddr + i, false);
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e = *fdpte | PAGE_RSRV | PAGE_U;
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page = e & PAGE_TA;
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if (!(prot & PROT_WRITE)) e &= ~PAGE_RW;
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if (!(prot & PROT_EXEC)) e |= PAGE_XD;
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}
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__ref_page(mm, pml4t, page);
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*pte = e;
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invlpg(addr + i);
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} else {
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addr = -1;
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break;
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}
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}
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res.addr = (void *)addr;
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res.maphandle = -1;
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return res;
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}
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#endif /* __x86_64__ */
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