An Extended Instruction Pointer (EIP) in computer science refers to a register that holds the memory address of the next instruction to be executed. In certain situations, attackers can manipulate the stack to control function calls by overwriting the function pointer stored in the stack, allowing...
https://zhuanlan.zhihu.com/p/55896356 SP stack pointer 指向当前栈桢顶部的堆栈指针 BP base pointer 指向当前栈桢底部的基指针 堆栈的内存地址越来越低,即向地址小的地方增长。 MOV 指令将源操作数复制到目的操作数 MOV destination,source 目的操作数的内容会发生改变,而源操作数不会改变。这种数据从右到左的...
Many lock-free algorithms are complex due to dealing with pointers. The problem with a pointer is that it takes two instructions to use it. The first instruction reads the value of the pointer stored in a memory location. The second instruction uses that pointer in some indexed operation. Sin...
A A special-purpose register, usually called the instruction pointer (IP) or program counter (PC), keeps track of what instruction is being executed. As we discussed in Chapter 2, a system can be equipped with a single CPU, in which case it is referred to as a uniprocessor (UP) system...
Because the codes for [BP] and [EPB] have this new meaning, there is no simple way to access memory given by the base pointer register. When the assembler sees one of these operands, it automatically creates the form [BP+00] or [EBP+00], which requires an additional displacement byte....
and executes the next instruction at the target address. The relative form computes the target address in the 64-bit ISA relative to the current XIP and Code Segment base, i.e. XIP=XIP +rell7* -CS.base. Note that the target instruction pointer is converted into the effective address space...
The instruction set was primitive, with only 8-bit data, limited addressing, and a single address pointer register. Finally, the system bus required a lot of interface circuitry. (See page 7.) ↩ The 8080 is often said to be the "first truly usable microprocessor". Supposedly the source...
Supervisor Stack Pointer Indirection is the action of taking the object or address value specified not as the Effective Address, but as the location containing the Effective Address. For example, when an Address Register is used as a pointer to the operand rather that the holder of the operand...
It facilitates choosing an immediate value or moving a register value to or from the stack pointer. The wide moves allow the programmer to widen the sixteen bit immediate value to fill a 32 or 64 bit destination register. 4.2.3.1 Syntax Sign in to download full-size image • is one of...
13. The method of claim 11, wherein the branch instruction with which the flow control indicator is associated was fetched from a sequence of micro instructions in a micro instruction sequencer in the first section, and the instruction pointer set in the determining step is a micro instructio...