WebMar 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 …
Did you know?
WebAug 11, 2024 · inc word ptr ds:[0] add word ptr [bx],2. 下面的指令中,用byte ptr 指明了指令访问的内存单元是一个字单元: mov byte ptr ds:[0],1. inc byte ptr [bx] inc byte ptr ds:[0] … WebMay 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.
WebAug 26, 2004 · 0046EFCF . 8B85 88FEFFFF mov eax,dword ptr ss:[ebp-178] 0046EFD5 . 8B40 04 mov eax,dword ptr ds:[eax+4] 这两句指令中 第一句是将 ebp-178 位置存放的 内存地址指针指向的内容 赋值给 eax WebStudy with Quizlet and memorize flashcards containing terms like 21. The following statement will assemble without errors: mov WORD PTR [eax], 1234h, 22. The following instruction will produce FFFFFFFCh in EAX: movsx eax,-4, 23. The SAHF instruction copies the Sign, Overflow, and Carry flags to the AL register. and more.
Webinc 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令中,用word prt或byte ptr显性地指明所要访问的内存单元的长度是很必要的。否则,CPU无法得知所要访问的单元,还是字节单元。假如我们用Debug查看内存的结果如下: 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.
Web3X Guinness World Records™ Title Holder Coach high performance tennis & pickleball players Inspirational speaker on Goal Setting USPTA, PTR, IPTPA, USTA Mental Skills & …
WebJul 15, 2024 · inc word ptr ds:[0] add word ptr [bx],2. 下面的指令中,用byte ptr 指明了指令访问的内存单元是一个字单元: mov byte ptr ds:[0],1. inc byte ptr [bx] inc byte ptr ds:[0] … northern star meaningWebOct 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。 northern star mining share priceWebJun 7, 2010 · The dword ptr part is called a size directive. This page explains them, but it wasn't possible to direct-link to the correct section. Basically, it means "the size of the target operand is 32 bits", so this will bitwise-AND the 32-bit value at the address computed by taking the contents of the ebp register and subtracting four with 0. The "d ... how to run linux on old laptopWebJul 6, 2024 · 例如,下面的指令中,用 word ptr指明了指令访问的内存单元是一个字单元 。. mov word ptr ds: [0],1. inc word ptr [bx] inc word ptr ds: [o] add word ptr [bx],2. 下面的指令中,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 … northern star mineWebOct 24, 2010 · inc word ptr ds:[0] add word ptr [bx],2. 下面的指令中,用 byte ptr 指明了指令访问的内存单元是一个字单元: mov byte ptr ds:[0],1. inc byte ptr [bx] inc byte ptr ds:[0] … northern star mortgage fund llcWebFind changesets by keywords (author, files, the commit message), revision number or hash, or revset expression. northern star market placeWebMar 6, 2012 · ptr应该就是pointer. bayinhe 2008-12-07. ptr说明指令中内存单元地址的指针类型应该是正解。. 比如. mov word ptr ds: [0],1 指的就是ds: [0]是一个字指针即该地址指向一个字数据单元. ttzyanswer 2008-11-27. ZZZ+2 是内存中的一个地址. dx 是 是一个十六寄存器. 如果 zzz 是 db 这样子来 ... northern star mothers milk bank calgary