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68 lines
2.4 KiB
68 lines
2.4 KiB
#include <vminstrs.hpp>
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namespace vm::instrs {
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profiler_t lconst = {
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"LCONST",
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mnemonic_t::lconst,
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{{// MOV REG, [VIP]
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IMM_FETCH,
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// SUB VSP, OFFSET
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SUB_VSP,
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// MOV [VSP], REG
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STR_VALUE}},
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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;
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res.mnemonic = mnemonic_t::lconst;
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res.imm.has_imm = true;
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const auto sub_vsp = 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 i.mnemonic == ZYDIS_MNEMONIC_SUB &&
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i.operands[0].type == ZYDIS_OPERAND_TYPE_REGISTER &&
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i.operands[0].reg.value == vsp &&
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i.operands[1].type == ZYDIS_OPERAND_TYPE_IMMEDIATE;
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});
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res.stack_size = sub_vsp->m_instr.operands[1].imm.value.u * 8;
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const auto fetch_imm = 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 vm::utils::is_mov(i) &&
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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 == vip;
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});
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res.imm.size = fetch_imm->m_instr.operands[1].size;
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const auto mov_vsp_imm = 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 i.mnemonic == ZYDIS_MNEMONIC_MOV &&
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i.operands[0].type == ZYDIS_OPERAND_TYPE_MEMORY &&
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i.operands[0].mem.base == vsp &&
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i.operands[1].type == ZYDIS_OPERAND_TYPE_REGISTER;
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});
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uc_context* backup;
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uc_context_alloc(hndlr.m_uc, &backup);
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uc_context_save(hndlr.m_uc, backup);
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uc_context_restore(hndlr.m_uc, mov_vsp_imm->m_cpu);
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const uc_x86_reg imm_reg =
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vm::instrs::reg_map[mov_vsp_imm->m_instr.operands[1].reg.value];
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uc_reg_read(hndlr.m_uc, imm_reg, &res.imm.val);
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res.imm.val <<= (64 - res.imm.size);
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res.imm.val >>= (64 - res.imm.size);
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uc_context_restore(hndlr.m_uc, backup);
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uc_context_free(backup);
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return res;
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}};
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} |