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145 lines
4.5 KiB
145 lines
4.5 KiB
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mem_map.h"
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#include "logging.h"
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#include "mman.h"
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#include <zircon/process.h>
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#include <zircon/syscalls.h>
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namespace art {
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static zx_handle_t fuchsia_lowmem_vmar = ZX_HANDLE_INVALID;
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static zx_vaddr_t fuchsia_lowmem_base = 0;
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static size_t fuchsia_lowmem_size = 0;
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static const char map_name[] = "mmap-android";
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static constexpr uintptr_t FUCHSIA_LOWER_MEM_START = 0x80000000;
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static constexpr uintptr_t FUCHSIA_LOWER_MEM_SIZE = 0x60000000;
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void MemMap::TargetMMapInit() {
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if (fuchsia_lowmem_vmar != ZX_HANDLE_INVALID) {
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return;
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}
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zx_info_vmar_t vmarinfo;
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CHECK_EQ(zx_object_get_info(zx_vmar_root_self(),
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ZX_INFO_VMAR,
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&vmarinfo,
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sizeof(vmarinfo),
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nullptr,
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nullptr), ZX_OK) << "could not find info from root vmar";
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uintptr_t lower_mem_start = FUCHSIA_LOWER_MEM_START - vmarinfo.base;
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fuchsia_lowmem_size = FUCHSIA_LOWER_MEM_SIZE;
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uint32_t allocflags = ZX_VM_FLAG_CAN_MAP_READ |
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ZX_VM_FLAG_CAN_MAP_WRITE |
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ZX_VM_FLAG_CAN_MAP_EXECUTE |
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ZX_VM_FLAG_SPECIFIC;
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CHECK_EQ(zx_vmar_allocate(zx_vmar_root_self(),
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lower_mem_start,
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fuchsia_lowmem_size,
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allocflags,
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&fuchsia_lowmem_vmar,
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&fuchsia_lowmem_base), ZX_OK) << "could not allocate lowmem vmar";
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}
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void* MemMap::TargetMMap(void* start, size_t len, int prot, int flags, int fd, off_t fd_off) {
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zx_status_t status;
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uintptr_t mem = 0;
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bool mmap_lower = (flags & MAP_32BIT) != 0;
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// for file-based mapping use system library
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if ((flags & MAP_ANONYMOUS) == 0) {
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if (start != nullptr) {
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flags |= MAP_FIXED;
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}
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CHECK(!mmap_lower) << "cannot map files into low memory for Fuchsia";
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return mmap(start, len, prot, flags, fd, fd_off);
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}
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uint32_t vmarflags = 0;
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if ((prot & PROT_READ) != 0) {
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vmarflags |= ZX_VM_FLAG_PERM_READ;
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}
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if ((prot & PROT_WRITE) != 0) {
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vmarflags |= ZX_VM_FLAG_PERM_WRITE;
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}
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if ((prot & PROT_EXEC) != 0) {
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vmarflags |= ZX_VM_FLAG_PERM_EXECUTE;
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}
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if (len == 0) {
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errno = EINVAL;
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return MAP_FAILED;
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}
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zx_info_vmar_t vmarinfo;
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size_t vmaroffset = 0;
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if (start != nullptr) {
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vmarflags |= ZX_VM_FLAG_SPECIFIC;
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status = zx_object_get_info((mmap_lower ? fuchsia_lowmem_vmar : zx_vmar_root_self()),
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ZX_INFO_VMAR,
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&vmarinfo,
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sizeof(vmarinfo),
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nullptr,
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nullptr);
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if (status < 0 || reinterpret_cast<uintptr_t>(start) < vmarinfo.base) {
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errno = EINVAL;
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return MAP_FAILED;
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}
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vmaroffset = reinterpret_cast<uintptr_t>(start) - vmarinfo.base;
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}
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zx_handle_t vmo;
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if (zx_vmo_create(len, 0, &vmo) < 0) {
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errno = ENOMEM;
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return MAP_FAILED;
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}
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zx_vmo_get_size(vmo, &len);
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zx_object_set_property(vmo, ZX_PROP_NAME, map_name, strlen(map_name));
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if (mmap_lower) {
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status = zx_vmar_map(fuchsia_lowmem_vmar, vmaroffset, vmo, fd_off, len, vmarflags, &mem);
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} else {
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status = zx_vmar_map(zx_vmar_root_self(), vmaroffset, vmo, fd_off, len, vmarflags, &mem);
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}
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zx_handle_close(vmo);
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if (status != ZX_OK) {
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return MAP_FAILED;
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}
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return reinterpret_cast<void *>(mem);
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}
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int MemMap::TargetMUnmap(void* start, size_t len) {
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uintptr_t addr = reinterpret_cast<uintptr_t>(start);
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zx_handle_t alloc_vmar = zx_vmar_root_self();
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if (addr >= fuchsia_lowmem_base && addr < fuchsia_lowmem_base + fuchsia_lowmem_size) {
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alloc_vmar = fuchsia_lowmem_vmar;
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}
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zx_status_t status = zx_vmar_unmap(alloc_vmar, addr, len);
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if (status < 0) {
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errno = EINVAL;
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return -1;
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}
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return 0;
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}
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} // namespace art
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