mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-13 23:46:40 +00:00
83 lines
3.6 KiB
C++
83 lines
3.6 KiB
C++
/*
|
|
* Copyright (c) Atmosphère-NX
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify it
|
|
* under the terms and conditions of the GNU General Public License,
|
|
* version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
|
|
* more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
#include <stratosphere.hpp>
|
|
#include "ro_map_utils.hpp"
|
|
|
|
namespace ams::ro::impl {
|
|
|
|
namespace {
|
|
|
|
|
|
ALWAYS_INLINE u64 GetCurrentProcessInfo(svc::InfoType info_type) {
|
|
u64 value;
|
|
R_ABORT_UNLESS(svc::GetInfo(std::addressof(value), info_type, svc::PseudoHandle::CurrentProcess, 0));
|
|
return value;
|
|
}
|
|
|
|
}
|
|
|
|
Result SearchFreeRegion(uintptr_t *out, size_t mapping_size) {
|
|
/* Get address space extents. */
|
|
const uintptr_t heap_start = GetCurrentProcessInfo(svc::InfoType_HeapRegionAddress);
|
|
const size_t heap_size = GetCurrentProcessInfo(svc::InfoType_HeapRegionSize);
|
|
const uintptr_t alias_start = GetCurrentProcessInfo(svc::InfoType_AliasRegionAddress);
|
|
const size_t alias_size = GetCurrentProcessInfo(svc::InfoType_AliasRegionSize);
|
|
const uintptr_t aslr_start = GetCurrentProcessInfo(svc::InfoType_AslrRegionAddress);
|
|
const size_t aslr_size = GetCurrentProcessInfo(svc::InfoType_AslrRegionSize);
|
|
|
|
/* Iterate upwards to find a free region. */
|
|
uintptr_t address = aslr_start;
|
|
while (true) {
|
|
/* Declare variables for memory querying. */
|
|
svc::MemoryInfo mem_info;
|
|
svc::PageInfo page_info;
|
|
|
|
/* Check that we're still within bounds. */
|
|
R_UNLESS(address < address + mapping_size, ro::ResultOutOfAddressSpace());
|
|
|
|
/* If we're within the heap region, skip to the end of the heap region. */
|
|
if (heap_size != 0 && !(address + mapping_size - 1 < heap_start || heap_start + heap_size - 1 < address)) {
|
|
R_UNLESS(address < heap_start + heap_size, ro::ResultOutOfAddressSpace());
|
|
address = heap_start + heap_size;
|
|
continue;
|
|
}
|
|
|
|
/* If we're within the alias region, skip to the end of the alias region. */
|
|
if (alias_size != 0 && !(address + mapping_size - 1 < alias_start || alias_start + alias_size - 1 < address)) {
|
|
R_UNLESS(address < alias_start + alias_size, ro::ResultOutOfAddressSpace());
|
|
address = alias_start + alias_size;
|
|
continue;
|
|
}
|
|
|
|
/* Get the current memory range. */
|
|
R_ABORT_UNLESS(svc::QueryMemory(std::addressof(mem_info), std::addressof(page_info), address));
|
|
|
|
/* If the memory range is free and big enough, use it. */
|
|
if (mem_info.state == svc::MemoryState_Free && mapping_size <= ((mem_info.base_address + mem_info.size) - address)) {
|
|
*out = address;
|
|
return ResultSuccess();
|
|
}
|
|
|
|
/* Check that we can advance. */
|
|
R_UNLESS(address < mem_info.base_address + mem_info.size, ro::ResultOutOfAddressSpace());
|
|
R_UNLESS(mem_info.base_address + mem_info.size - 1 < aslr_start + aslr_size - 1, ro::ResultOutOfAddressSpace());
|
|
|
|
/* Advance. */
|
|
address = mem_info.base_address + mem_info.size;
|
|
}
|
|
}
|
|
|
|
}
|