mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
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83 lines
3.6 KiB
C++
83 lines
3.6 KiB
C++
/*
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* Copyright (c) Atmosphère-NX
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <stratosphere.hpp>
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#include "ro_map_utils.hpp"
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namespace ams::ro::impl {
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namespace {
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ALWAYS_INLINE u64 GetCurrentProcessInfo(svc::InfoType info_type) {
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u64 value;
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R_ABORT_UNLESS(svc::GetInfo(std::addressof(value), info_type, svc::PseudoHandle::CurrentProcess, 0));
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return value;
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}
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}
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Result SearchFreeRegion(uintptr_t *out, size_t mapping_size) {
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/* Get address space extents. */
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const uintptr_t heap_start = GetCurrentProcessInfo(svc::InfoType_HeapRegionAddress);
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const size_t heap_size = GetCurrentProcessInfo(svc::InfoType_HeapRegionSize);
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const uintptr_t alias_start = GetCurrentProcessInfo(svc::InfoType_AliasRegionAddress);
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const size_t alias_size = GetCurrentProcessInfo(svc::InfoType_AliasRegionSize);
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const uintptr_t aslr_start = GetCurrentProcessInfo(svc::InfoType_AslrRegionAddress);
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const size_t aslr_size = GetCurrentProcessInfo(svc::InfoType_AslrRegionSize);
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/* Iterate upwards to find a free region. */
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uintptr_t address = aslr_start;
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while (true) {
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/* Declare variables for memory querying. */
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svc::MemoryInfo mem_info;
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svc::PageInfo page_info;
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/* Check that we're still within bounds. */
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R_UNLESS(address < address + mapping_size, ro::ResultOutOfAddressSpace());
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/* If we're within the heap region, skip to the end of the heap region. */
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if (heap_size != 0 && !(address + mapping_size - 1 < heap_start || heap_start + heap_size - 1 < address)) {
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R_UNLESS(address < heap_start + heap_size, ro::ResultOutOfAddressSpace());
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address = heap_start + heap_size;
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continue;
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}
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/* If we're within the alias region, skip to the end of the alias region. */
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if (alias_size != 0 && !(address + mapping_size - 1 < alias_start || alias_start + alias_size - 1 < address)) {
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R_UNLESS(address < alias_start + alias_size, ro::ResultOutOfAddressSpace());
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address = alias_start + alias_size;
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continue;
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}
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/* Get the current memory range. */
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R_ABORT_UNLESS(svc::QueryMemory(std::addressof(mem_info), std::addressof(page_info), address));
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/* If the memory range is free and big enough, use it. */
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if (mem_info.state == svc::MemoryState_Free && mapping_size <= ((mem_info.base_address + mem_info.size) - address)) {
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*out = address;
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return ResultSuccess();
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}
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/* Check that we can advance. */
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R_UNLESS(address < mem_info.base_address + mem_info.size, ro::ResultOutOfAddressSpace());
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R_UNLESS(mem_info.base_address + mem_info.size - 1 < aslr_start + aslr_size - 1, ro::ResultOutOfAddressSpace());
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/* Advance. */
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address = mem_info.base_address + mem_info.size;
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}
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}
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}
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