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63 lines
2.5 KiB
63 lines
2.5 KiB
#include <vminstrs.hpp>
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// Loads an address and value from the stack, ands the derefed address with the value
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namespace vm::instrs {
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profiler_t _and = {
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"AND",
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mnemonic_t::_and,
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{{// MOV REG, [VSP] This is the address
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LOAD_VALUE,
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// MOV REG, [VSP+8]
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[](const zydis_reg_t vip, const zydis_reg_t vsp,
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const zydis_decoded_instr_t& instr) -> bool {
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return instr.mnemonic == ZYDIS_MNEMONIC_MOV &&
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instr.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
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instr.operands[1].type == ZYDIS_OPERAND_TYPE_MEMORY &&
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instr.operands[1].mem.base == vsp &&
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instr.operands[1].mem.disp.has_displacement,
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instr.operands[1].mem.disp.value == 8;
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},
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// AND [REG], REG
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[](const zydis_reg_t vip, const zydis_reg_t vsp,
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const zydis_decoded_instr_t& instr) -> bool {
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return instr.mnemonic == ZYDIS_MNEMONIC_AND &&
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instr.operands[0].type == ZYDIS_OPERAND_TYPE_MEMORY &&
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instr.operands[0].mem.base != ZYDIS_REGISTER_NONE &&
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instr.operands[1].type == ZYDIS_OPERAND_TYPE_REGISTER;
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},
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// PUSHFQ
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[](const zydis_reg_t vip, const zydis_reg_t vsp,
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const zydis_decoded_instr_t& instr) -> bool {
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return instr.mnemonic == ZYDIS_MNEMONIC_PUSHFQ;
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},
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// POP [VSP]
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[](const zydis_reg_t vip, const zydis_reg_t vsp,
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const zydis_decoded_instr_t& instr) -> bool {
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return instr.mnemonic == ZYDIS_MNEMONIC_POP &&
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instr.operands[0].type == ZYDIS_OPERAND_TYPE_MEMORY &&
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instr.operands[0].mem.base == vsp;
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}}},
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[](zydis_reg_t& vip, zydis_reg_t& vsp,
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hndlr_trace_t& hndlr) -> std::optional<vinstr_t> {
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vinstr_t res{mnemonic_t::_and};
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res.imm.has_imm = false;
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// MOV REG [VSP+OFFSET]
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const auto mov_vsp_offset = std::find_if(
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hndlr.m_instrs.begin(), hndlr.m_instrs.end(),
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[&](emu_instr_t& instr) -> bool {
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const auto& i = instr.m_instr;
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return
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i.mnemonic == ZYDIS_MNEMONIC_MOV &&
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i.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
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i.operands[1].type == ZYDIS_OPERAND_TYPE_MEMORY &&
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i.operands[1].mem.base == vsp &&
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i.operands[1].mem.disp.has_displacement;
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});
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if (mov_vsp_offset == hndlr.m_instrs.end())
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return std::nullopt;
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res.stack_size = mov_vsp_offset->m_instr.operands[0].size;
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return res;
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}};
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} |