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dmnt-cheat: Begin implementing Cheat VM.

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This commit is contained in:
Michael Scire
2019-02-27 18:33:07 -08:00
parent f5ac895062
commit 2552c0327c
4 changed files with 277 additions and 2 deletions
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109
stratosphere/dmnt/source/dmnt_cheat_vm.cpp Normal file
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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 "dmnt_cheat_types.hpp"
#include "dmnt_cheat_vm.hpp"
bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode *out) {
/* TODO: Parse opcodes */
return false;
}
void DmntCheatVm::SkipConditionalBlock() {
CheatVmOpcode skip_opcode;
while (this->DecodeNextOpcode(&skip_opcode)) {
/* Decode instructions until we see end of conditional block. */
/* NOTE: This is broken in gateway's implementation. */
/* Gateway currently checks for "0x2" instead of "0x20000000" */
/* In addition, they do a linear scan instead of correctly decoding opcodes. */
/* This causes issues if "0x2" appears as an immediate in the conditional block... */
if (skip_opcode.opcode == CheatVmOpcodeType_EndConditionalBlock) {
break;
}
}
}
void DmntCheatVm::Execute(const CheatProcessMetadata *metadata) {
CheatVmOpcode cur_opcode;
u64 kDown = 0;
/* TODO: Get Keys down. */
/* Clear VM state. */
for (size_t i = 0; i < DmntCheatVm::NumRegisters; i++) {
this->registers[i] = 0;
this->loop_tops[i] = 0;
}
/* Loop until program finishes. */
while (this->DecodeNextOpcode(&cur_opcode)) {
switch (cur_opcode.opcode) {
case CheatVmOpcodeType_StoreStatic:
{
/* TODO */
}
break;
case CheatVmOpcodeType_BeginConditionalBlock:
{
/* TODO */
}
break;
case CheatVmOpcodeType_EndConditionalBlock:
/* There is nothing to do here. Just move on to the next instruction. */
break;
case CheatVmOpcodeType_ControlLoop:
if (cur_opcode.ctrl_loop.start_loop) {
/* Start a loop. */
this->registers[cur_opcode.ctrl_loop.register_index] = cur_opcode.ctrl_loop.num_iters;
this->loop_tops[cur_opcode.ctrl_loop.register_index] = this->instruction_ptr;
} else {
/* End a loop. */
this->registers[cur_opcode.ctrl_loop.register_index]--;
if (this->registers[cur_opcode.ctrl_loop.register_index] != 0) {
this->instruction_ptr = this->loop_tops[cur_opcode.ctrl_loop.register_index];
}
}
break;
case CheatVmOpcodeType_LoadRegisterStatic:
/* Set a register to a static value. */
this->registers[cur_opcode.ldr_static.register_index] = cur_opcode.ldr_static.value;
break;
case CheatVmOpcodeType_LoadRegisterMemory:
{
/* TODO */
}
break;
case CheatVmOpcodeType_StoreToRegisterAddress:
{
/* TODO */
}
break;
case CheatVmOpcodeType_PerformArithmetic:
{
/* TODO */
}
break;
case CheatVmOpcodeType_BeginKeypressConditionalBlock:
/* Check for keypress. */
if ((cur_opcode.begin_keypress_cond.key_mask & kDown) != cur_opcode.begin_keypress_cond.key_mask) {
/* Keys not pressed. Skip conditional block. */
this->SkipConditionalBlock();
}
break;
}
}
}