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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "MmapRegion.h"
#include "Emulator.h"
#include <string.h>
#include <sys/mman.h>
namespace UserspaceEmulator {
NonnullOwnPtr<MmapRegion> MmapRegion::create_anonymous(u32 base, u32 size, u32 prot)
{
auto region = adopt_own(*new MmapRegion(base, size, prot));
region->m_file_backed = false;
region->m_data = (u8*)calloc(1, size);
return region;
}
NonnullOwnPtr<MmapRegion> MmapRegion::create_file_backed(u32 base, u32 size, u32 prot, int flags, int fd, off_t offset, String name)
{
auto region = adopt_own(*new MmapRegion(base, size, prot));
region->m_file_backed = true;
if (!name.is_empty()) {
name = String::formatted("{} (Emulated)", name);
region->m_name = name;
}
region->m_data = (u8*)mmap_with_name(nullptr, size, prot, flags, fd, offset, name.is_empty() ? nullptr : name.characters());
ASSERT(region->m_data != MAP_FAILED);
return region;
}
MmapRegion::MmapRegion(u32 base, u32 size, int prot)
: Region(base, size)
{
set_prot(prot);
m_shadow_data = (u8*)malloc(size);
memset(m_shadow_data, 1, size);
}
MmapRegion::~MmapRegion()
{
free(m_shadow_data);
if (m_file_backed)
munmap(m_data, size());
else
free(m_data);
}
ValueWithShadow<u8> MmapRegion::read8(FlatPtr offset)
{
if (!is_readable()) {
reportln("8-bit read from unreadable MmapRegion @ {:p}", base() + offset);
emulator().dump_backtrace();
TODO();
}
if (is_malloc_block()) {
if (auto* tracer = emulator().malloc_tracer())
tracer->audit_read(*this, base() + offset, 1);
}
ASSERT(offset < size());
return { *reinterpret_cast<const u8*>(m_data + offset), *reinterpret_cast<const u8*>(m_shadow_data + offset) };
}
ValueWithShadow<u16> MmapRegion::read16(u32 offset)
{
if (!is_readable()) {
reportln("16-bit read from unreadable MmapRegion @ {:p}", base() + offset);
emulator().dump_backtrace();
TODO();
}
if (is_malloc_block()) {
if (auto* tracer = emulator().malloc_tracer())
tracer->audit_read(*this, base() + offset, 2);
}
ASSERT(offset + 1 < size());
return { *reinterpret_cast<const u16*>(m_data + offset), *reinterpret_cast<const u16*>(m_shadow_data + offset) };
}
ValueWithShadow<u32> MmapRegion::read32(u32 offset)
{
if (!is_readable()) {
reportln("32-bit read from unreadable MmapRegion @ {:p}", base() + offset);
emulator().dump_backtrace();
TODO();
}
if (is_malloc_block()) {
if (auto* tracer = emulator().malloc_tracer())
tracer->audit_read(*this, base() + offset, 4);
}
ASSERT(offset + 3 < size());
return { *reinterpret_cast<const u32*>(m_data + offset), *reinterpret_cast<const u32*>(m_shadow_data + offset) };
}
ValueWithShadow<u64> MmapRegion::read64(u32 offset)
{
if (!is_readable()) {
reportln("64-bit read from unreadable MmapRegion @ {:p}", base() + offset);
emulator().dump_backtrace();
TODO();
}
if (is_malloc_block()) {
if (auto* tracer = emulator().malloc_tracer())
tracer->audit_read(*this, base() + offset, 8);
}
ASSERT(offset + 7 < size());
return { *reinterpret_cast<const u64*>(m_data + offset), *reinterpret_cast<const u64*>(m_shadow_data + offset) };
}
void MmapRegion::write8(u32 offset, ValueWithShadow<u8> value)
{
if (!is_writable()) {
reportln("8-bit write from unwritable MmapRegion @ {:p}", base() + offset);
emulator().dump_backtrace();
TODO();
}
if (is_malloc_block()) {
if (auto* tracer = emulator().malloc_tracer())
tracer->audit_write(*this, base() + offset, 1);
}
ASSERT(offset < size());
*reinterpret_cast<u8*>(m_data + offset) = value.value();
*reinterpret_cast<u8*>(m_shadow_data + offset) = value.shadow();
}
void MmapRegion::write16(u32 offset, ValueWithShadow<u16> value)
{
if (!is_writable()) {
reportln("16-bit write from unwritable MmapRegion @ {:p}", base() + offset);
emulator().dump_backtrace();
TODO();
}
if (is_malloc_block()) {
if (auto* tracer = emulator().malloc_tracer())
tracer->audit_write(*this, base() + offset, 2);
}
ASSERT(offset + 1 < size());
*reinterpret_cast<u16*>(m_data + offset) = value.value();
*reinterpret_cast<u16*>(m_shadow_data + offset) = value.shadow();
}
void MmapRegion::write32(u32 offset, ValueWithShadow<u32> value)
{
if (!is_writable()) {
reportln("32-bit write from unwritable MmapRegion @ {:p}", base() + offset);
emulator().dump_backtrace();
TODO();
}
if (is_malloc_block()) {
if (auto* tracer = emulator().malloc_tracer())
tracer->audit_write(*this, base() + offset, 4);
}
ASSERT(offset + 3 < size());
ASSERT(m_data != m_shadow_data);
*reinterpret_cast<u32*>(m_data + offset) = value.value();
*reinterpret_cast<u32*>(m_shadow_data + offset) = value.shadow();
}
void MmapRegion::write64(u32 offset, ValueWithShadow<u64> value)
{
if (!is_writable()) {
reportln("64-bit write from unwritable MmapRegion @ {:p}", base() + offset);
emulator().dump_backtrace();
TODO();
}
if (is_malloc_block()) {
if (auto* tracer = emulator().malloc_tracer())
tracer->audit_write(*this, base() + offset, 8);
}
ASSERT(offset + 7 < size());
ASSERT(m_data != m_shadow_data);
*reinterpret_cast<u64*>(m_data + offset) = value.value();
*reinterpret_cast<u64*>(m_shadow_data + offset) = value.shadow();
}
void MmapRegion::set_prot(int prot)
{
set_readable(prot & PROT_READ);
set_writable(prot & PROT_WRITE);
set_executable(prot & PROT_EXEC);
if (m_file_backed) {
mprotect(m_data, size(), prot);
}
}
}
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