It is undesirable to disable these options because this reduces the information content of the disassembled code. Principally, disabling these options might be. General Information About Virtual Memory. If you load some executable module into IDA Pro, two files will be created into the directory, from which you have. Disassembling Code: IDA Pro and SoftICE,, (isbn , ean ), by Pirogov V.

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When the application is based on API programming, one function can correspond to one window. Later, you’ll be able to identify variables in one glance at the memory region.

Under these circumstances, each message is marked by the handle of the window, for which that message is intended. Dump of the program code First, it is necessary to point out disassemblinh the command length might coee from 1 byte to 10 bytes or even more. The classical structure of the console application can be called a batch structure Listing 1.

Each bit of the result of the AND operation is set to one if the corresponding bits of the source and inverted destination bits are one; otherwise, it is set to zero.

In the course of this operation, the stack is popped. The rep prefix is not used. However, if you want to write a program that would tightly interact with the user, you’ll have to process keyboard and mouse events. The two-operand form is follows: The source and mask operands are Oro registers. The command was introduced in the Intel Pentium processor.



The source operand which can be a register or a memory location contains the segment selector for the segment descriptor being accessed. Introduction to Disassembling 11 I Signed Numbers Because the memory contains only binary digits, it would be logical to dedicate a separate bit for storing the number sign. The target address can be specified directly by a label or indirectly; in other words, this value can be stored in the memory cell or register jmp [eax].

An optional parameter, n, assumes that the command also automatically clears the stack frees N bytes. Packed shift left logical. This function redirects the newly-arrived messages to the given window function.

The size of the store address depends on the address-size attribute.

| Disassembling Code: IDA Pro and SoftICE

This command was in troduced in the Intel 48 6 processor. In general, the normalized form of a number appears as follows: These commands are used for control if the index falls within the specified range, which is important for debugging purposes.

This copies the values of sign bits 63 and into bits 0 and 1 of the r32 register.

This compares rpl fields of two segment selectors, and if the rpl field of the destination operand is less than the rpl field of the source operand, zf is set to one and the RPL field of softiice destination operand is increased disassemblihg match that of the source operand.


This loads the source operand 16 bits into the segment selector field of LDTR. In addition to the previously-listed register, the coprocessor has the fip and fdp registers.

Read from the TRn test register. Also, it is important to understand the structure of data representation in computer memory, as well as to know the structure of programs written for the Windows operating system.


Save the FPU state sw, cw, tagw, fip, fdp in the memory without checking for error conditions. In general, however, its features and behavior are the same as the ones of the program shown in Listing 1. The first 6 bytes, however, are the most interesting. They play a special role in index operations. This loop could be called the message-processing loop of a console application.

The low- order word of each intermediate result is then written to its corresponding word location in the destination operand. Specific Features of Windows Programming This section is a brief introduction to Windows programming. The daa instruction then adjusts the contents of the al register so that they contain the correct two-digit, packed BCD result.