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Figure 2.3 General-purpose registers in IA-32.
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IA-32 processors have a special register called EFLAGS that contains all kinds of status and system flags. The system flags are used for managing the various processor modes and states, and are irrelevant for this discussion. The status flags, on the other hand, are used by the processor for recording its current logical state, and are updated by many logical and integer instructions in order to record the outcome of their actions. Additionally, there are instructions that operate based on the values of these status flags, so that it becomes possible to
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create sequences of instructions that perform different operations based on different input values, and so on. In IA-32 code, flags are a basic tool for creating conditional code. There are arithmetic instructions that test operands for certain conditions and set processor flags based on their values. Then there are instructions that read these flags and perform different operations depending on the values loaded into the flags. One popular group of instructions that act based on flag values is the Jcc (Conditional Jump) instructions, which test for certain flag values (depending on the specific instruction invoked) and jump to a specified code address if the flags are set according to the specific conditional code specified. Let s look at an example to see how it is possible to create a conditional statement like the ones we re used to seeing in high-level languages using flags. Say you have a variable that was called bSuccess in the high-level language, and that you have code that tests whether it is false. The code might look like this:
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if (bSuccess == FALSE) return 0;
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What would this line look like in assembly language It is not generally possible to test a variable s value and act on that value in a single instruction most instructions are too primitive for that. Instead, we must test the value of bSuccess (which will probably be loaded into a register first), set some flags that record whether it is zero or not, and invoke a conditional branch instruction that will test the necessary flags and branch if they indicate that the operand handled in the most recent instruction was zero (this is indicated by the Zero Flag, ZF). Otherwise the processor will just proceed to execute the instruction that follows the branch instruction. Alternatively, the compiler might reverse the condition and branch if bSuccess is nonzero. There are many factors that determine whether compilers reverse conditions or not. This topic is discussed in depth in Appendix A.
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Instruction Format
Before we start discussing individual assembly language instructions, I d like to introduce the basic layout of IA-32 instructions. Instructions usually consist of an opcode (operation code), and one or two operands. The opcode is an instruction name such as MOV, and the operands are the parameters that the instruction receives (some instructions have no operands). Naturally, each instruction requires different operands because they each perform a different task. Operands represent data that is handled by the specific instruction (just like parameters passed to a function), and in assembly language, data comes in three basic forms:
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Register name: The name of a general-purpose register to be read from or written to. In IA-32, this would be something like EAX, EBX, and so on. Immediate: A constant value embedded right in the code. This often indicates that there was some kind of hard-coded constant in the original program. Memory address: When an operand resides in RAM, its memory address is enclosed in brackets to indicate that it is a memory address. The address can either be a hard-coded immediate that simply tells the processor the exact address to read from or write to or it can be a register whose value will be used as a memory address. It is also possible to combine a register with some arithmetic and a constant, so that the register represents the base address of some object, and the constant represents an offset into that object or an index into an array.
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The general instruction format looks like this: