mirror of
https://github.com/Atmosphere-NX/Atmosphere.git
synced 2024-11-05 19:51:45 +00:00
402 lines
No EOL
17 KiB
C++
402 lines
No EOL
17 KiB
C++
/*
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* Copyright (c) 2018 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 <switch.h>
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#include "dmnt_cheat_types.hpp"
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#include "dmnt_cheat_vm.hpp"
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#include "dmnt_cheat_manager.hpp"
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bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode *out) {
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/* If we've ever seen a decode failure, return true. */
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bool valid = this->decode_success;
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CheatVmOpcode opcode = {};
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ON_SCOPE_EXIT {
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this->decode_success &= valid;
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if (valid) {
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*out = opcode;
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}
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};
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/* If we have ever seen a decode failure, don't decode any more. */
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if (!valid) {
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return valid;
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}
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/* Validate instruction pointer. */
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if (this->instruction_ptr >= this->num_opcodes) {
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valid = false;
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return valid;
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}
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/* Read opcode. */
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const u32 first_dword = this->program[this->instruction_ptr++];
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opcode.opcode = (CheatVmOpcodeType)(((first_dword >> 28) & 0xF));
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switch (opcode.opcode) {
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case CheatVmOpcodeType_StoreStatic:
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{
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/* TODO */
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}
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break;
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case CheatVmOpcodeType_BeginConditionalBlock:
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{
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/* TODO */
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}
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break;
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case CheatVmOpcodeType_EndConditionalBlock:
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{
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/* There's actually nothing left to process here! */
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}
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break;
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case CheatVmOpcodeType_ControlLoop:
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{
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/* TODO */
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}
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break;
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case CheatVmOpcodeType_LoadRegisterStatic:
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{
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/* TODO */
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}
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break;
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case CheatVmOpcodeType_LoadRegisterMemory:
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{
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/* TODO */
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}
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break;
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case CheatVmOpcodeType_StoreToRegisterAddress:
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{
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/* TODO */
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}
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break;
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case CheatVmOpcodeType_PerformArithmeticStatic:
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{
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/* TODO */
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}
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break;
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case CheatVmOpcodeType_BeginKeypressConditionalBlock:
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{
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/* TODO */
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}
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break;
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case CheatVmOpcodeType_PerformArithmeticRegister:
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{
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/* TODO */
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}
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break;
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default:
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/* Unrecognized instruction cannot be decoded. */
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valid = false;
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break;
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}
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/* End decoding. */
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return valid;
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}
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void DmntCheatVm::SkipConditionalBlock() {
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CheatVmOpcode skip_opcode;
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while (this->DecodeNextOpcode(&skip_opcode)) {
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/* Decode instructions until we see end of conditional block. */
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/* NOTE: This is broken in gateway's implementation. */
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/* Gateway currently checks for "0x2" instead of "0x20000000" */
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/* In addition, they do a linear scan instead of correctly decoding opcodes. */
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/* This causes issues if "0x2" appears as an immediate in the conditional block... */
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if (skip_opcode.opcode == CheatVmOpcodeType_EndConditionalBlock) {
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break;
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}
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}
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}
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u64 DmntCheatVm::GetVmInt(VmInt value, u32 bit_width) {
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switch (bit_width) {
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case 1:
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return value.bit8;
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case 2:
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return value.bit16;
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case 4:
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return value.bit32;
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case 8:
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return value.bit64;
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default:
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/* Invalid bit width -> return 0. */
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return 0;
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}
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}
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u64 DmntCheatVm::GetCheatProcessAddress(const CheatProcessMetadata* metadata, MemoryAccessType mem_type, u64 rel_address) {
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switch (mem_type) {
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case MemoryAccessType_MainNso:
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default:
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return metadata->main_nso_extents.base + rel_address;
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case MemoryAccessType_Heap:
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return metadata->heap_extents.base + rel_address;
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}
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}
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void DmntCheatVm::ResetState() {
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for (size_t i = 0; i < DmntCheatVm::NumRegisters; i++) {
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this->registers[i] = 0;
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this->loop_tops[i] = 0;
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}
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this->instruction_ptr = 0;
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this->decode_success = true;
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}
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void DmntCheatVm::Execute(const CheatProcessMetadata *metadata) {
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CheatVmOpcode cur_opcode;
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u64 kDown = 0;
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/* TODO: Get Keys down. */
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/* Clear VM state. */
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this->ResetState();
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/* Loop until program finishes. */
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while (this->DecodeNextOpcode(&cur_opcode)) {
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switch (cur_opcode.opcode) {
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case CheatVmOpcodeType_StoreStatic:
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{
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/* Calculate address, write value to memory. */
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u64 dst_address = GetCheatProcessAddress(metadata, cur_opcode.store_static.mem_type, cur_opcode.store_static.rel_address + this->registers[cur_opcode.store_static.offset_register]);
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u64 dst_value = GetVmInt(cur_opcode.store_static.value, cur_opcode.store_static.bit_width);
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switch (cur_opcode.store_static.bit_width) {
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case 1:
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case 2:
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case 4:
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case 8:
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DmntCheatManager::WriteCheatProcessMemoryForVm(dst_address, &dst_value, cur_opcode.store_static.bit_width);
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break;
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}
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}
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break;
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case CheatVmOpcodeType_BeginConditionalBlock:
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{
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/* Read value from memory. */
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u64 src_address = GetCheatProcessAddress(metadata, cur_opcode.begin_cond.mem_type, cur_opcode.begin_cond.rel_address);
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u64 src_value = 0;
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switch (cur_opcode.store_static.bit_width) {
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case 1:
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case 2:
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case 4:
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case 8:
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DmntCheatManager::ReadCheatProcessMemoryForVm(src_address, &src_value, cur_opcode.begin_cond.bit_width);
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break;
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}
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/* Check against condition. */
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u64 cond_value = GetVmInt(cur_opcode.begin_cond.value, cur_opcode.begin_cond.bit_width);
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bool cond_met = false;
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switch (cur_opcode.begin_cond.cond_type) {
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case ConditionalComparisonType_GT:
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cond_met = src_value > cond_value;
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break;
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case ConditionalComparisonType_GE:
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cond_met = src_value >= cond_value;
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break;
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case ConditionalComparisonType_LT:
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cond_met = src_value < cond_value;
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break;
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case ConditionalComparisonType_LE:
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cond_met = src_value <= cond_value;
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break;
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case ConditionalComparisonType_EQ:
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cond_met = src_value == cond_value;
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break;
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case ConditionalComparisonType_NE:
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cond_met = src_value != cond_value;
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break;
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}
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/* Skip conditional block if condition not met. */
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if (!cond_met) {
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this->SkipConditionalBlock();
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}
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}
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break;
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case CheatVmOpcodeType_EndConditionalBlock:
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/* There is nothing to do here. Just move on to the next instruction. */
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break;
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case CheatVmOpcodeType_ControlLoop:
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if (cur_opcode.ctrl_loop.start_loop) {
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/* Start a loop. */
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this->registers[cur_opcode.ctrl_loop.reg_index] = cur_opcode.ctrl_loop.num_iters;
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this->loop_tops[cur_opcode.ctrl_loop.reg_index] = this->instruction_ptr;
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} else {
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/* End a loop. */
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this->registers[cur_opcode.ctrl_loop.reg_index]--;
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if (this->registers[cur_opcode.ctrl_loop.reg_index] != 0) {
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this->instruction_ptr = this->loop_tops[cur_opcode.ctrl_loop.reg_index];
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}
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}
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break;
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case CheatVmOpcodeType_LoadRegisterStatic:
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/* Set a register to a static value. */
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this->registers[cur_opcode.ldr_static.reg_index] = cur_opcode.ldr_static.value;
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break;
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case CheatVmOpcodeType_LoadRegisterMemory:
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{
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/* Choose source address. */
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u64 src_address;
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if (cur_opcode.ldr_memory.load_from_reg) {
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src_address = this->registers[cur_opcode.ldr_memory.reg_index] + cur_opcode.ldr_memory.rel_address;
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} else {
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src_address = GetCheatProcessAddress(metadata, cur_opcode.ldr_memory.mem_type, cur_opcode.ldr_memory.rel_address);
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}
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/* Read into register. Gateway only reads on valid bitwidth. */
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switch (cur_opcode.ldr_memory.bit_width) {
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case 1:
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case 2:
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case 4:
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case 8:
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DmntCheatManager::ReadCheatProcessMemoryForVm(src_address, &this->registers[cur_opcode.ldr_memory.reg_index], cur_opcode.ldr_memory.bit_width);
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break;
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}
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}
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break;
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case CheatVmOpcodeType_StoreToRegisterAddress:
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{
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/* Calculate address. */
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u64 dst_address = this->registers[cur_opcode.str_regaddr.reg_index];
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u64 dst_value = cur_opcode.str_regaddr.value;
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if (cur_opcode.str_regaddr.add_offset_reg) {
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dst_address += this->registers[cur_opcode.str_regaddr.offset_reg_index];
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}
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/* Write value to memory. Gateway only writes on valid bitwidth. */
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switch (cur_opcode.str_regaddr.bit_width) {
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case 1:
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case 2:
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case 4:
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case 8:
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DmntCheatManager::WriteCheatProcessMemoryForVm(dst_address, &dst_value, cur_opcode.str_regaddr.bit_width);
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break;
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}
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/* Increment register if relevant. */
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if (cur_opcode.str_regaddr.increment_reg) {
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this->registers[cur_opcode.str_regaddr.reg_index] += cur_opcode.str_regaddr.bit_width;
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}
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}
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break;
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case CheatVmOpcodeType_PerformArithmeticStatic:
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{
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/* Do requested math. */
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switch (cur_opcode.perform_math_static.math_type) {
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case RegisterArithmeticType_Addition:
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this->registers[cur_opcode.perform_math_static.reg_index] += (u64)cur_opcode.perform_math_static.value;
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break;
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case RegisterArithmeticType_Subtraction:
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this->registers[cur_opcode.perform_math_static.reg_index] -= (u64)cur_opcode.perform_math_static.value;
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break;
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case RegisterArithmeticType_Multiplication:
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this->registers[cur_opcode.perform_math_static.reg_index] *= (u64)cur_opcode.perform_math_static.value;
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break;
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case RegisterArithmeticType_LeftShift:
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this->registers[cur_opcode.perform_math_static.reg_index] <<= (u64)cur_opcode.perform_math_static.value;
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break;
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case RegisterArithmeticType_RightShift:
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this->registers[cur_opcode.perform_math_static.reg_index] >>= (u64)cur_opcode.perform_math_static.value;
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break;
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default:
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/* Do not handle extensions here. */
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break;
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}
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/* Apply bit width. */
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switch (cur_opcode.perform_math_static.bit_width) {
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case 1:
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this->registers[cur_opcode.perform_math_static.reg_index] = static_cast<u8>(this->registers[cur_opcode.perform_math_static.reg_index]);
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break;
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case 2:
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this->registers[cur_opcode.perform_math_static.reg_index] = static_cast<u16>(this->registers[cur_opcode.perform_math_static.reg_index]);
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break;
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case 4:
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this->registers[cur_opcode.perform_math_static.reg_index] = static_cast<u32>(this->registers[cur_opcode.perform_math_static.reg_index]);
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break;
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case 8:
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this->registers[cur_opcode.perform_math_static.reg_index] = static_cast<u64>(this->registers[cur_opcode.perform_math_static.reg_index]);
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break;
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}
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}
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break;
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case CheatVmOpcodeType_BeginKeypressConditionalBlock:
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/* Check for keypress. */
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if ((cur_opcode.begin_keypress_cond.key_mask & kDown) != cur_opcode.begin_keypress_cond.key_mask) {
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/* Keys not pressed. Skip conditional block. */
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this->SkipConditionalBlock();
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}
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break;
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case CheatVmOpcodeType_PerformArithmeticRegister:
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{
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const u64 operand_1_value = this->registers[cur_opcode.perform_math_reg.src_reg_1_index];
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const u64 operand_2_value = cur_opcode.perform_math_reg.has_immediate ?
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GetVmInt(cur_opcode.perform_math_reg.value, cur_opcode.perform_math_reg.bit_width) :
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this->registers[cur_opcode.perform_math_reg.src_reg_2_index];
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u64 res_val = 0;
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/* Do requested math. */
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switch (cur_opcode.perform_math_reg.math_type) {
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case RegisterArithmeticType_Addition:
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res_val = operand_1_value + operand_2_value;
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break;
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case RegisterArithmeticType_Subtraction:
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res_val = operand_1_value - operand_2_value;
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break;
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case RegisterArithmeticType_Multiplication:
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res_val = operand_1_value * operand_2_value;
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break;
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case RegisterArithmeticType_LeftShift:
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res_val = operand_1_value << operand_2_value;
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break;
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case RegisterArithmeticType_RightShift:
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res_val = operand_1_value >> operand_2_value;
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break;
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case RegisterArithmeticType_LogicalAnd:
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res_val = operand_1_value & operand_2_value;
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break;
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case RegisterArithmeticType_LogicalOr:
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res_val = operand_1_value | operand_2_value;
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break;
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case RegisterArithmeticType_LogicalNot:
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res_val = ~operand_1_value;
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break;
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case RegisterArithmeticType_LogicalXor:
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res_val = operand_1_value ^ operand_2_value;
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break;
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case RegisterArithmeticType_None:
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res_val = operand_1_value;
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break;
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}
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/* Apply bit width. */
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switch (cur_opcode.perform_math_reg.bit_width) {
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case 1:
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res_val = static_cast<u8>(res_val);
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break;
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case 2:
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res_val = static_cast<u16>(res_val);
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break;
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case 4:
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res_val = static_cast<u32>(res_val);
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break;
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case 8:
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res_val = static_cast<u64>(res_val);
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break;
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}
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/* Save to register. */
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this->registers[cur_opcode.perform_math_reg.dst_reg_index] = res_val;
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}
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break;
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}
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}
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} |