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VERSION 1.0 CLASS
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BEGIN
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MultiUse = -1 'True
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Persistable = 0 'NotPersistable
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DataBindingBehavior = 0 'vbNone
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DataSourceBehavior = 0 'vbNone
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MTSTransactionMode = 0 'NotAnMTSObject
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END
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Attribute VB_Name = "CX86Operand"
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Attribute VB_GlobalNameSpace = False
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Attribute VB_Creatable = True
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Attribute VB_PredeclaredId = False
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Attribute VB_Exposed = False
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Option Explicit
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'Capstone Disassembly Engine bindings for VB6
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'Contributed by FireEye FLARE Team
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'Author: David Zimmer <david.zimmer@fireeye.com>, <dzzie@yahoo.com>
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'License: Apache
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'Copyright: FireEye 2017
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'// Instruction operand sizeof() reports 48 bytes
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'typedef struct cs_x86_op {
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' x86_op_type type; // operand type
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'
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' union {
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' x86_reg reg; // register value for REG operand
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' int64_t imm; // immediate value for IMM operand
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' double fp; // floating point value for FP operand
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' x86_op_mem mem; // base/index/scale/disp value for MEM operand (24bytes max)
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' };
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'
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' // size of this operand (in bytes).
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' uint8_t size;
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'
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' // AVX broadcast type, or 0 if irrelevant
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' x86_avx_bcast avx_bcast;
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'
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' // AVX zero opmask {z}
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' bool avx_zero_opmask;
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'} cs_x86_op;
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'Instruction's operand referring to memory
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'This is associated with X86_OP_MEM operand type above
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'Public Type x86_op_mem
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' segment As Long ' segment register (or X86_REG_INVALID if irrelevant) UNSIGNED
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' base As Long ' base register (or X86_REG_INVALID if irrelevant) UNSIGNED
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' index As Long ' index register (or X86_REG_INVALID if irrelevant) UNSIGNED
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' scale As Long ' scale for index register
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' disp As Currency ' displacement value
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'End Type
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'this shows the alignment padding used by compiler..
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' cs_x86_op op;
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' op.type = (x86_op_type)1;
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' op.reg = (x86_reg)2;
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' op.avx_bcast = (x86_avx_bcast)3;
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' op.avx_zero_opmask = 4;
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' op.size = 0xaa;
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' printf("&cs_x86_op = %x", &op);
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' _asm int 3
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'
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'
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'0x0012FF34 01 00 00 00 cc cc cc cc 02 00 00 00 cc cc cc cc ....<2E><><EFBFBD><EFBFBD>....<2E><><EFBFBD><EFBFBD>
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'0x0012FF44 cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc cc <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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'0x0012FF54 aa cc cc cc 03 00 00 00 01 cc cc cc cc cc cc cc <20><><EFBFBD><EFBFBD>.....<2E><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
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Public optype As x86_op_type
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Public size As Byte
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Public avx_bcast As x86_avx_bcast
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Public avx_zero_opmask As Boolean
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'only one of the following will be set based on type
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Public reg As x86_reg
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Public fp As Currency
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Public imm As Currency
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Public mem As CX86OpMem
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Private hEngine As Long
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Private m_raw() As Byte
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Function toString() As String
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Dim ret() As String
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push ret, "X86 Operand:"
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push ret, String(45, "-")
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If DEBUG_DUMP Then
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push ret, "Raw: "
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push ret, HexDump(m_raw)
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End If
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push ret, "Type: " & opStr()
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push ret, "Size: " & size
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If avx_bcast <> 0 Then push ret, "BCast: " & bcastStr()
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If avx_zero_opmask Then push ret, "AvxOpMask: " & avx_zero_opmask
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If optype = X86_OP_FP Then
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push ret, "FP: " & cur2str(fp)
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ElseIf optype = X86_OP_IMM Then
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push ret, "IMM: " & cur2str(imm)
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ElseIf optype = x86_op_mem Then
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If mem.base <> 0 Then push ret, "Base: " & regName(hEngine, mem.base)
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If mem.index <> 0 Then push ret, "Index: " & regName(hEngine, mem.index)
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If mem.scale_ <> 1 Then push ret, "Scale: " & Hex(mem.scale_)
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If mem.segment <> 0 Then push ret, "Seg: " & regName(hEngine, mem.segment)
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If mem.disp <> 0 Then push ret, "Disp: " & cur2str(mem.disp)
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ElseIf optype = X86_OP_REG Then
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push ret, "Reg: " & regName(hEngine, reg)
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End If
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toString = Join(ret, vbCrLf)
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End Function
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Function opStr() As String
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If optype = X86_OP_FP Then opStr = "X86_OP_FP"
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If optype = x86_op_mem Then opStr = "x86_op_mem"
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If optype = X86_OP_IMM Then opStr = "X86_OP_IMM"
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If optype = X86_OP_REG Then opStr = "X86_OP_REG"
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If optype = X86_OP_INVALID Then opStr = "X86_OP_INVALID"
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If Len(opStr) = 0 Then
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opStr = "Error: " & Hex(optype)
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ElseIf DEBUG_DUMP Then
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opStr = opStr & " (" & Hex(optype) & ")"
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End If
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End Function
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Function bcastStr() As String
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Dim r As String
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If avx_bcast = X86_AVX_BCAST_INVALID Then r = "X86_AVX_BCAST_INVALID"
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If avx_bcast = X86_AVX_BCAST_2 Then r = "X86_AVX_BCAST_2"
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If avx_bcast = X86_AVX_BCAST_4 Then r = "X86_AVX_BCAST_4"
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If avx_bcast = X86_AVX_BCAST_8 Then r = "X86_AVX_BCAST_8"
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If avx_bcast = X86_AVX_BCAST_16 Then r = "X86_AVX_BCAST_16"
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If Len(r) = 0 Then
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r = "Unknown: " & Hex(avx_bcast)
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ElseIf DEBUG_DUMP Then
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r = r & " (" & Hex(avx_bcast) & ")"
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End If
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bcastStr = r
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End Function
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Friend Sub LoadDetails(lpStruct As Long, hCapstone As Long)
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Dim opMem As x86_op_mem
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Dim ptr As Long
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Const align4 = 4
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Const align3 = 3
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hEngine = hCapstone
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If DEBUG_DUMP Then
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ReDim m_raw(48)
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CopyMemory ByVal VarPtr(m_raw(0)), ByVal lpStruct, 48
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End If
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optype = readLng(lpStruct)
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ptr = lpStruct + 4 + align4
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If optype = X86_OP_FP Then
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fp = readCur(ptr)
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ElseIf optype = X86_OP_IMM Then
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imm = readCur(ptr)
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ElseIf optype = x86_op_mem Then
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CopyMemory ByVal VarPtr(opMem), ByVal ptr, LenB(opMem)
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Set mem = New CX86OpMem
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mem.base = opMem.base
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mem.disp = opMem.disp
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mem.index = opMem.index
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mem.scale_ = opMem.scale
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mem.segment = opMem.segment
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ElseIf optype = X86_OP_REG Then
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reg = readLng(ptr)
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End If
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ptr = ptr + LenB(opMem)
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size = readByte(ptr)
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ptr = ptr + 1 + align3
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avx_bcast = readLng(ptr)
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ptr = ptr + 4
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avx_zero_opmask = (readByte(ptr) = 1)
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End Sub
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Private Sub Class_Terminate()
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'looks like everything is freeing up ok
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'Debug.Print "Cx86Operand.Terminate"
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End Sub
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