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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A command such as pop eax will be represented by the following sequence: It extends the byte al into a word and copies the sign bit in the source operand into every bit in the ah register. For example, H will take two memory cells, the least significant cell according to the convention will contain 4 5H, and the coce significant cell will store 13H.

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

If the result is greater than one, return to step 1. Arithmetic Coprocessor Commands Chapter 1: These blocks are called memory cells or bytes.

SGDT dest Store gdtr in the memory. The esi, edi, esp, and ebp registers also have subregisters. Any address formed by a program is compared with the addresses lro in the debug registers. What was the result of elaborating this theory?


The sign of the whole number is negative because bit 31 is set to one. It causes exception 7 when executing the next coprocessor command. Then, the instruction performs a bitwise logical and operation on the inverted destination operand and the quadword source operand second operand.

Decrement the FPU register’s stack pointer. To convert the fractional part, use the algorithm just considered. In the disasembling, I hope to write a textbook on the basis of this book. But the most disappointing issue is that the codes of the push and pop operations dealing with registers other than the previously-listed working registers or even memory cells that play the role of operands, are different.


The dump of the code presented in Listing 1. The port is addressed directly through the dx register. I hope that this book will be useful to everyone interested in the internal mechanisms of program operation and willing to understand how high-level programming language constructs are converted to machine commands.

For example, consider Listing 1. The message-processing loop is used to redirect each newly-arrived message to the appropriate handler function Listing 1.

Target Audience This book is not intended for readers who have no programming experience. This is the cost of optimization. On the basis cide the material in this section, it is possible to conclude that if real numbers are used in a program, they might become approximate before any actions are carried out over them.

Appendixes Appendix 1: Applications idz on the basis of such interactions are more tightly integrated into the operating system and, consequently, have more powerful capabilities in comparison to other programs.

The arithmetic coprocessor carries out operations over the following data types: And what about mov commands where 8-bit registers are encountered? Nevertheless, lots of materials provided here will be applicable for the Windows 9 x www.

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. Other bits are as follows: This instruction shuffles the prl integers packed into the high quadword of the source operand and stores the shuffled result in the high quadword of the destination operand.

Such loops are more xnd of windowing applications; disassemb,ing, for console applications this approach is also permitted. 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 the destination operand is increased to match that of the source operand.


The three-operand form of this instruction is as follows: But cf receives a copy of the bit shifted from one end to the other.

Data exchange commands Command Description MOV dest, src Load data to or from the register, memory, or immediate operand. A certain difference in processing of the window closing event clicking the Close button in the top right corner also attracts attention.

Command Format of the Intel Microprocessor 1. The disassembled code of the fragment softicce in Listing 1. System Address Registers These registers are used in the protected mode of Intel processors.


In essence, all differences between console and GUI applications consist of the Subsystem flag stored in the portable executable PE header see Section 1. This multiplies the 4 signed or unsigned words of the source operand second operand with the 4 signed or unsigned words of the destination operand first operandproducing four double word, intermediate results. In addition, for this type of application, the presence of the message-processing loop is typical.

The conversion of fractions from the hex numeral system to the binary numeral system, and vice versa, is easy; you do this in the same way as for integer numbers. Src may be either cl or the immediate operand.