You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
56 lines
2.3 KiB
56 lines
2.3 KiB
#include <vmprofiler.hpp>
|
|
|
|
namespace vm::calc_jmp
|
|
{
|
|
bool get( zydis_routine_t &vm_entry, zydis_routine_t &calc_jmp )
|
|
{
|
|
auto result = vm::util::get_fetch_operand( vm_entry );
|
|
|
|
if ( !result.has_value() )
|
|
return false;
|
|
|
|
calc_jmp.insert( calc_jmp.end(), result.value(), vm_entry.end() );
|
|
return true;
|
|
}
|
|
|
|
std::optional< vmp2::exec_type_t > get_advancement( const zydis_routine_t &calc_jmp )
|
|
{
|
|
auto result = std::find_if( calc_jmp.begin(), calc_jmp.end(), []( const zydis_instr_t &instr_data ) -> bool {
|
|
// look for any instruction with RSI being the first operand and its being written too..
|
|
return instr_data.instr.operands[ 0 ].actions & ZYDIS_OPERAND_ACTION_WRITE &&
|
|
instr_data.instr.operands[ 0 ].type == ZYDIS_OPERAND_TYPE_REGISTER &&
|
|
instr_data.instr.operands[ 0 ].reg.value == ZYDIS_REGISTER_RSI;
|
|
} );
|
|
|
|
if ( result == calc_jmp.end() )
|
|
return {};
|
|
|
|
const auto &instr = result->instr;
|
|
|
|
switch ( instr.mnemonic )
|
|
{
|
|
case ZYDIS_MNEMONIC_LEA:
|
|
// if operand type is memory, then return advancement type
|
|
// based off of the disposition value... (neg == backward, pos == forward)
|
|
if ( instr.operands[ 1 ].type == ZYDIS_OPERAND_TYPE_MEMORY )
|
|
return instr.operands[ 1 ].mem.disp.value > 0 ? vmp2::exec_type_t::forward
|
|
: vmp2::exec_type_t::backward;
|
|
break;
|
|
case ZYDIS_MNEMONIC_ADD:
|
|
if ( instr.operands[ 1 ].type == ZYDIS_OPERAND_TYPE_IMMEDIATE )
|
|
return instr.operands[ 1 ].imm.value.s > 0 ? vmp2::exec_type_t::forward : vmp2::exec_type_t::backward;
|
|
break;
|
|
case ZYDIS_MNEMONIC_SUB:
|
|
if ( instr.operands[ 1 ].type == ZYDIS_OPERAND_TYPE_IMMEDIATE )
|
|
return instr.operands[ 1 ].imm.value.s > 0 ? vmp2::exec_type_t::backward : vmp2::exec_type_t::forward;
|
|
break;
|
|
case ZYDIS_MNEMONIC_INC:
|
|
return vmp2::exec_type_t::forward;
|
|
case ZYDIS_MNEMONIC_DEC:
|
|
return vmp2::exec_type_t::backward;
|
|
default:
|
|
break;
|
|
}
|
|
return {};
|
|
}
|
|
} // namespace vm::calc_jmp
|