Inc word ptr的寻址方式
Web// We assume that a smart pointer (Ptr) to a relevant network device // is in hand; here, it is the net0 pointer. // 1. Pointer-based access // // One way to change the value is to access … http://yimitumi.com/2024/03/30/%E5%8D%81%E4%B9%9D-word-ptr-%E5%92%8C-byte-ptr-%E6%B1%87%E7%BC%96%E7%AC%94%E8%AE%B0/
Inc word ptr的寻址方式
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WebAug 11, 2024 · 关于dword ptr 指令. dword 双字 就是四个字节. ptr pointer缩写 即指针. []里的数据是一个地址值,这个地址指向一个双字型数据. 比如mov eax, dword ptr [12345678] 把 内存地址 12345678中的双字型(32位)数据赋给eax. 8086CPU的指令, 可以处理两种尺寸的数据 , byte和word ...
WebApr 8, 2024 · Then add word ptr [freq_array + eax * 2], 1. In 32-bit code you can take advantage of its more powerful addressing modes (compared to 16-bit). Also note that your code would be unsafe if freq_array spans a 64k boundary; add si, ax could wrap without doing carry-out into the high bits of ESI. – Peter Cordes. Web1 依据位移进行转移的call指令. call标号 (将当前IP压栈后,转到标号处执行指令) CPU执行此种格式的call指令时,进行如下的操作:. 1) (sp) = (sp) - 2. ( (ss)* 16 + (sp)) = (IP) 2) (IP) = (IP) + 16位位移. 16位位移 = 标号处的地址 - call指令后的第一个字节的地址; 16位位移的范围 …
WebOct 24, 2010 · 1、关于dword ptr 指令. 8086CPU的指令,可以处理两种尺寸的数据,byte和word。. 所以在机器指令中要指明,指令进行的是字操作还是字节操作。. 对于这个问题,汇编语言中用一下方法处理。. (1)通过寄存器名指明要处理的数据的尺寸。. 例如:. 下面的指 … WebMar 15, 2024 · dword ptr [eax] - points to memory, which address is eax, so this statement copies 32 bit value from memory to eax. About the why this would happen, it depends on the context. For example, this could be used to load the value of [eax] on the stack, to use it as an argument for a function call.
WebOct 21, 2005 · PE文件添加节显示启动信息. 闲来写了个修改PE的小程序,主要是演示和实践PE操作和重定位的概念,实在没事情的时候,可以看看,你将会看到PE文件实际上很简单!当然,首. 先得作好被我的垃圾代码扫了雅兴的准备.这里利用的是我前面介绍的方法的手动查找API的方 …
WebFind changesets by keywords (author, files, the commit message), revision number or hash, or revset expression. the outnorthWebMay 2, 2012 · 2 Answers. Sorted by: 13. In the cases you're looking at, the byte ptr and word ptr don't accomplish much. While harmless, the assembler already "knows" that al and dl are byte-sized, and that bx is word-sized. You need something like byte ptr when (for example) you move an immediate value to an indirect address: mov bx, some offset mov [bx], 1. shunt effectWeb例10:jmp bx jmp word ptr [bx]+1234h 这种寻址方式是在寄存器或存储器中找到要转移到的地址,而地址是16bit的,因而寄存器必须为16bit,如:bx,我们用word ptr来指定存储器单元也是16bit的。注意:它是间接的给出,只能使用类似于数据操作数中的除立即寻址以 … shunt electrical definitionWeb微机原理--8种寻址方式 指令和指令系统指令:控制计算机完成某种操作的命令 指令系统:处理器能识别的所有指令的集合 指令的兼容性:同一系列机的指令是兼容的 指令的包含的 … the outnet reflauntWebFeb 8, 2013 · So this. mov bx,word ptr b+1. is in fact. mov bx,word ptr [b+1] which has effect of copying a word at address b+1 into bx. Now dd instructs to allocate a dword and assign 256 to it. 256 in hex is represented as 00000100h. The dword will be allocated in memory like this 00010000h - bytes 00h, 01h, 00h, 00h because on x86 lower bytes are stored ... the outnumbered motherWebMar 30, 2024 · 用byte ptr指明了指令访问的内存单元是一个字节单元。 mov byte ptr ds:[0], 1 inc byte ptr [bx] inc byte ptr ds:[0] add byte ptr [bx], 2 在没有寄存器参与的内存单元访问指 … the outnet self portraitWebOct 28, 2024 · (9) inc word ptr 0152h[bx] ;(1l352h)= 8089h, cf= 0 。 3.9 编写完成如下操作的程序段: (1)将立即数 2000H 送 DX,立即数 88 送 AH。 MOV DX,2000H ; MOV AH,88H (2 )将立即数 1234H 送存储单元 2345H 中。 shunte lofton