May 23, 2020

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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SLDT softicr Store ldtr. The method of converting numbers from a decimal to a hex system, and vice versa, is similar to the method described in the previous section; the only difference is that in this case the system base is 16 instead of 2.

The port is addressed directly through the dx register.

Save the control word into dest. The ebp register is usually employed for addressing parameters and local variables in the stack.

Disassembling Code: IDA Pro and SoftICE – Vlad Pirogov – Google Books

This command accepts three operands register-operand-source, memory cell-operand-destination, or accumulator; in disassemgling words, al, ia or eax. CLI Clear the interrupt flag. These commands cyclically shift all bits of the source oper and to the left or right, including the carry flag, into rotation. This loads the source operand into msw, bits 0— 15 of register cro. The esp register is the stack pointer that is automatically modified by push, pop, ret, and call; however, it is rarely used explicitly.

Instruct the processor to wait for FPU to complete the current operation. In addition to the previously-listed register, the coprocessor has the fip and fdp registers. The size of these registers is 64 bits. Having located it in the disassembled code, you’d be able to locate the program fragment that precedes the loop — in other words, determine where in the program the main window is created and where the main window ids is registered.


Load a BCD into st 0 from an bit memory area. This multiplies the individual signed words of the destination operand by the po signed words of the source operand, producing 4 signed, double word results. Try to investigate this issue on your own. Packed multiply and add.


In addition, for this type of application, the presence of the message-processing loop is typical. In particular, this library is responsible for the new control style Windows XP interface style.

This issue is important for analysis of the binary code. This book contains lots of reference materials. For example, the program might open some file, carry out some actions, and then close the file and terminate operation. The operating system provides a range of such procedures to simplify resource management for application programs. Dissasembling intersegment jump can appear as follows: Disassembing commands “spoil” the status register and the tags register.

If you program in some high-level programming language but are not acquainted with Assembly, you’ll need to consult some book dedicated to Assembly programming from time to time.

Note that this is the case only if you know for sure, from which address the command being studied starts. The pshuflw instruction copies words from the softiec quadword of the source operand second operand and inserts them in the low quadword erf the destination operand first operand at word locations selected with the order operand third operand. Arithmetic Coprocessor Commands Softide 1: This is a bus locking prefix.


Two registers are popped from the stack. Coprocessor Commands Tables 1. AX and copies the sign bit bit 15 of the word in the ax register into every bit of the Dx register. As can be easily seen, the command code corresponds to B8H, and the first 3 bits define the register, into which the immediate operand will be saved.

Perform the logical and operation. Divide the given number by two and take the remainder as the next most significant bit. Consider the following example: The size of the store address depends on the address-size attribute.

In the course of this operation, the stack is popped twice. For example, consider a fragment of the disassembled listing produced by the IDA Pro disassembler Listing 1. Idw first 6 bytes, however, are the most interesting. To have hands-on practice, consider the following sequence of bytes: At the same time, it is obvious that the least significant bit defines inversion: Src may be either disassemblingg or the immediate operand.

However, it is also possible to explicitly specify the return type retn or rete. Also, it is necessary to note that these commands for segment registers fs and gs have 2-byte codes. Compare the real number in st 0 with the operand in memory.