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Atmosphere/stratosphere/loader/source/ldr_map.cpp

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/*
* Copyright (c) 2018 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 <switch.h>
#include <cstdio>
#include "ldr_map.hpp"
#include "ldr_random.hpp"
Result MapUtils::LocateSpaceForMap(u64 *out, u64 out_size) {
if (kernelAbove200()) {
return LocateSpaceForMapModern(out, out_size);
} else {
return LocateSpaceForMapDeprecated(out, out_size);
}
}
Result MapUtils::MapCodeMemoryForProcess(Handle process_h, bool is_64_bit_address_space, u64 base_address, u64 size, u64 *out_code_memory_address) {
if (kernelAbove200()) {
return MapCodeMemoryForProcessModern(process_h, base_address, size, out_code_memory_address);
} else {
return MapCodeMemoryForProcessDeprecated(process_h, is_64_bit_address_space, base_address, size, out_code_memory_address);
}
}
Result MapUtils::LocateSpaceForMapModern(u64 *out, u64 out_size) {
MemoryInfo mem_info = {};
AddressSpaceInfo address_space = {};
u32 page_info = 0;
u64 cur_base = 0, cur_end = 0;
Result rc;
if (R_FAILED((rc = GetAddressSpaceInfo(&address_space, CUR_PROCESS_HANDLE)))) {
return rc;
}
cur_base = address_space.addspace_base;
rc = ResultKernelOutOfMemory;
cur_end = cur_base + out_size;
if (cur_end <= cur_base) {
return rc;
}
while (true) {
if (address_space.heap_size && (address_space.heap_base <= cur_end - 1 && cur_base <= address_space.heap_end - 1)) {
/* If we overlap the heap region, go to the end of the heap region. */
if (cur_base == address_space.heap_end) {
return rc;
}
cur_base = address_space.heap_end;
} else if (address_space.map_size && (address_space.map_base <= cur_end - 1 && cur_base <= address_space.map_end - 1)) {
/* If we overlap the map region, go to the end of the map region. */
if (cur_base == address_space.map_end) {
return rc;
}
cur_base = address_space.map_end;
} else {
if (R_FAILED(svcQueryMemory(&mem_info, &page_info, cur_base))) {
/* TODO: panic. */
}
if (mem_info.type == 0 && mem_info.addr - cur_base + mem_info.size >= out_size) {
*out = cur_base;
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return ResultSuccess;
}
if (mem_info.addr + mem_info.size <= cur_base) {
return rc;
}
cur_base = mem_info.addr + mem_info.size;
if (cur_base >= address_space.addspace_end) {
return rc;
}
}
cur_end = cur_base + out_size;
if (cur_base + out_size <= cur_base) {
return rc;
}
}
}
Result MapUtils::LocateSpaceForMapDeprecated(u64 *out, u64 out_size) {
MemoryInfo mem_info = {};
u32 page_info = 0;
Result rc;
u64 cur_base = 0x8000000ULL;
if (R_FAILED((rc = svcQueryMemory(&mem_info, &page_info, cur_base)))) {
return rc;
}
rc = ResultKernelOutOfMemory;
while (true) {
if (mem_info.type == 0x10) {
return rc;
}
if (mem_info.type == 0 && mem_info.addr - cur_base + mem_info.size >= out_size) {
*out = cur_base;
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return ResultSuccess;
}
u64 mem_end = mem_info.addr + mem_info.size;
if (mem_end < cur_base) {
return rc;
}
if (mem_end >> 31) {
break;
}
cur_base = mem_end;
if (R_FAILED((rc = svcQueryMemory(&mem_info, &page_info, cur_base)))) {
return rc;
}
}
return rc;
}
Result MapUtils::MapCodeMemoryForProcessModern(Handle process_h, u64 base_address, u64 size, u64 *out_code_memory_address) {
AddressSpaceInfo address_space = {};
Result rc;
if (R_FAILED((rc = GetAddressSpaceInfo(&address_space, process_h)))) {
return rc;
}
if (size > address_space.addspace_size) {
return ResultLoaderInsufficientAddressSpace;
}
u64 try_address;
for (unsigned int i = 0; i < 0x200; i++) {
while (true) {
try_address = address_space.addspace_base + (RandomUtils::GetRandomU64((u64)(address_space.addspace_size - size) >> 12) << 12);
if (address_space.heap_size && (address_space.heap_base <= try_address + size - 1 && try_address <= address_space.heap_end - 1)) {
continue;
}
if (address_space.map_size && (address_space.map_base <= try_address + size - 1 && try_address <= address_space.map_end - 1)) {
continue;
}
break;
}
rc = svcMapProcessCodeMemory(process_h, try_address, base_address, size);
if (rc != ResultKernelInvalidMemoryState) {
break;
}
}
if (R_SUCCEEDED(rc)) {
*out_code_memory_address = try_address;
}
return rc;
}
Result MapUtils::MapCodeMemoryForProcessDeprecated(Handle process_h, bool is_64_bit_address_space, u64 base_address, u64 size, u64 *out_code_memory_address) {
Result rc;
u64 addspace_base, addspace_size;
if (is_64_bit_address_space) {
addspace_base = 0x8000000ULL;
addspace_size = 0x78000000ULL;
} else {
addspace_base = 0x200000ULL;
addspace_size = 0x3FE0000ULL;
}
if (size > addspace_size) {
return ResultLoaderInsufficientAddressSpace;
}
u64 try_address;
for (unsigned int i = 0; i < 0x200; i++) {
try_address = addspace_base + (RandomUtils::GetRandomU64((u64)(addspace_size - size) >> 12) << 12);
rc = svcMapProcessCodeMemory(process_h, try_address, base_address, size);
if (rc != ResultKernelInvalidMemoryState) {
break;
}
}
if (R_SUCCEEDED(rc)) {
*out_code_memory_address = try_address;
}
return rc;
}
Result MapUtils::GetAddressSpaceInfo(AddressSpaceInfo *out, Handle process_h) {
Result rc;
if (R_FAILED((rc = svcGetInfo(&out->heap_base, 4, process_h, 0)))) {
return rc;
}
if (R_FAILED((rc = svcGetInfo(&out->heap_size, 5, process_h, 0)))) {
return rc;
}
if (R_FAILED((rc = svcGetInfo(&out->map_base, 2, process_h, 0)))) {
return rc;
}
if (R_FAILED((rc = svcGetInfo(&out->map_size, 3, process_h, 0)))) {
return rc;
}
if (R_FAILED((rc = svcGetInfo(&out->addspace_base, 12, process_h, 0)))) {
return rc;
}
if (R_FAILED((rc = svcGetInfo(&out->addspace_size, 13, process_h, 0)))) {
return rc;
}
out->heap_end = out->heap_base + out->heap_size;
out->map_end = out->map_base + out->map_size;
out->addspace_end = out->addspace_base + out->addspace_size;
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return ResultSuccess;
}