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dmnt-cheat: Implement remaining VM opcodes

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This commit is contained in:
Michael Scire
2019-03-03 06:29:48 -08:00
parent a3fc2c95b8
commit bc6ad53018
4 changed files with 135 additions and 8 deletions
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99
stratosphere/dmnt/source/dmnt_cheat_vm.cpp
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@@ -17,6 +17,7 @@
#include <switch.h>
#include "dmnt_cheat_types.hpp"
#include "dmnt_cheat_vm.hpp"
#include "dmnt_cheat_manager.hpp"
bool DmntCheatVm::DecodeNextOpcode(CheatVmOpcode *out) {
/* TODO: Parse opcodes */
@@ -53,6 +54,16 @@ u64 DmntCheatVm::GetVmInt(VmInt value, u32 bit_width) {
}
}
u64 DmntCheatVm::GetCheatProcessAddress(const CheatProcessMetadata* metadata, MemoryAccessType mem_type, u64 rel_address) {
switch (mem_type) {
case MemoryAccessType_MainNso:
default:
return metadata->main_nso_extents.base + rel_address;
case MemoryAccessType_Heap:
return metadata->heap_extents.base + rel_address;
}
}
void DmntCheatVm::Execute(const CheatProcessMetadata *metadata) {
CheatVmOpcode cur_opcode;
u64 kDown = 0;
@@ -70,12 +81,59 @@ void DmntCheatVm::Execute(const CheatProcessMetadata *metadata) {
switch (cur_opcode.opcode) {
case CheatVmOpcodeType_StoreStatic:
{
/* TODO */
/* Calculate address, write value to memory. */
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]);
u64 dst_value = GetVmInt(cur_opcode.store_static.value, cur_opcode.store_static.bit_width);
switch (cur_opcode.store_static.bit_width) {
case 1:
case 2:
case 4:
case 8:
DmntCheatManager::WriteCheatProcessMemoryForVm(dst_address, &dst_value, cur_opcode.store_static.bit_width);
break;
}
}
break;
case CheatVmOpcodeType_BeginConditionalBlock:
{
/* TODO */
/* Read value from memory. */
u64 src_address = GetCheatProcessAddress(metadata, cur_opcode.begin_cond.mem_type, cur_opcode.begin_cond.rel_address);
u64 src_value = 0;
switch (cur_opcode.store_static.bit_width) {
case 1:
case 2:
case 4:
case 8:
DmntCheatManager::ReadCheatProcessMemoryForVm(src_address, &src_value, cur_opcode.begin_cond.bit_width);
break;
}
/* Check against condition. */
u64 cond_value = GetVmInt(cur_opcode.begin_cond.value, cur_opcode.begin_cond.bit_width);
bool cond_met = false;
switch (cur_opcode.begin_cond.cond_type) {
case ConditionalComparisonType_GT:
cond_met = src_value > cond_value;
break;
case ConditionalComparisonType_GE:
cond_met = src_value >= cond_value;
break;
case ConditionalComparisonType_LT:
cond_met = src_value < cond_value;
break;
case ConditionalComparisonType_LE:
cond_met = src_value <= cond_value;
break;
case ConditionalComparisonType_EQ:
cond_met = src_value == cond_value;
break;
case ConditionalComparisonType_NE:
cond_met = src_value != cond_value;
break;
}
/* Skip conditional block if condition not met. */
if (!cond_met) {
this->SkipConditionalBlock();
}
}
break;
case CheatVmOpcodeType_EndConditionalBlock:
@@ -100,12 +158,45 @@ void DmntCheatVm::Execute(const CheatProcessMetadata *metadata) {
break;
case CheatVmOpcodeType_LoadRegisterMemory:
{
/* TODO */
/* Choose source address. */
u64 src_address;
if (cur_opcode.ldr_memory.load_from_reg) {
src_address = this->registers[cur_opcode.ldr_memory.reg_index] + cur_opcode.ldr_memory.rel_address;
} else {
src_address = GetCheatProcessAddress(metadata, cur_opcode.ldr_memory.mem_type, cur_opcode.ldr_memory.rel_address);
}
/* Read into register. Gateway only reads on valid bitwidth. */
switch (cur_opcode.ldr_memory.bit_width) {
case 1:
case 2:
case 4:
case 8:
DmntCheatManager::ReadCheatProcessMemoryForVm(src_address, &this->registers[cur_opcode.ldr_memory.reg_index], cur_opcode.ldr_memory.bit_width);
break;
}
}
break;
case CheatVmOpcodeType_StoreToRegisterAddress:
{
/* TODO */
/* Calculate address. */
u64 dst_address = this->registers[cur_opcode.str_regaddr.reg_index];
u64 dst_value = cur_opcode.str_regaddr.value;
if (cur_opcode.str_regaddr.add_offset_reg) {
dst_address += this->registers[cur_opcode.str_regaddr.offset_reg_index];
}
/* Write value to memory. Gateway only writes on valid bitwidth. */
switch (cur_opcode.str_regaddr.bit_width) {
case 1:
case 2:
case 4:
case 8:
DmntCheatManager::WriteCheatProcessMemoryForVm(dst_address, &dst_value, cur_opcode.str_regaddr.bit_width);
break;
}
/* Increment register if relevant. */
if (cur_opcode.str_regaddr.increment_reg) {
this->registers[cur_opcode.str_regaddr.reg_index] += cur_opcode.str_regaddr.bit_width;
}
}
break;
case CheatVmOpcodeType_PerformArithmeticStatic: