问题描述
我一直在将可执行文件转换为某些NASM shellcode(如果相关，则用于Windows)，但是我在rep指令中到处都遇到错误:解析器:预期指令"错误.
I've been turning an executable into some NASM shellcode (for windows if it's relevant) but i'm encountering "error: parser: instruction expected" errors all over the place from rep instructions.
label_0000641:
lea edi,[esp+0x164]
label_0000648:
rep movs DWORD es:[edi],DWORD ds:[esi]
label_000064a:
and DWORD [esp+0x168],0x0
是否有一些特殊的nasm语法?我是在犯一个愚蠢的错误吗?我不知道该如何解决这些错误，真的想要一些指导.
Is there some special nasm syntax for this? Am I making a stupid mistake?I have no idea how to go about fixing these errors and would really like some guidance.
(我正在使用nasm -f bin -o out.bin test.asm进行编译)
(I'm compiling with nasm -f bin -o out.bin test.asm)
谢谢.
推荐答案
NASM将不接受rep movs DWORD es:[edi],DWORD ds:[esi]
从 NASM手册中获取； 2.2.3 NASM不存储变量类型
因此，NASM不支持LODS，MOVS，STOS，SCAS，CMPS，INS或OUTS指令，而仅支持以下格式LODSB，MOVSW和SCASD，它们明确指定要操作的字符串的组成部分的大小.
For this reason, NASM doesn't support the LODS, MOVS, STOS, SCAS, CMPS, INS, or OUTS instructions, but only supports the forms such as LODSB, MOVSW, and SCASD, which explicitly specify the size of the components of the strings being manipulated.
因此使用的代码是rep movsd
这篇关于NASM:解析器:指令预期代表动作的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！