2019年5月1日 · 0x90 is actually just one instruction of the 0x90 + r opcode family which stands for xchg r32, eax. eax is register 0, so 0x90 stands for xchg eax, eax which is a NOP. In long mode, 0x90 is special cased not to zero out the high 32 bit of rax to keep its function as a …

2015年7月18日 · 0x90 is indeed out of range for ASCII, which only covers 0x00 to 0x7f. The file may be in some Unicode encoding, or it may be in some 8-bit encoding, in the ISO-8859 family. Once you have found that out, open your file with the …

2018年3月8日 · In C '\x90' and 0x90 are both int constant literals, but they may have a different value if the char type is signed and has 8 bits. In this case, '\x90' has a value of -112 whereas 0x90 is always 144. The C Standard specifies this: 6.4.4.4 Character constants. §10 An integer character constant has type int. The value of an integer character ...

2015年11月14日 · Furthermore, 0x90 may conceivably be used by compilers as filler for uninitialized arrays, in case the data in the array gets interpreted as opcodes, it does nothing. You see a similar effect with Visual studio which fills uninitialized arrays with 0xCC which is int 3 that causes a breakpoint halt.

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2013年8月23日 · The 0x90 specifies the opcode for the NOP instruction - to be used as the padding instructions to achieve the alignment. There are longer instructions sequences that are also effective NOPs. Many of the assemblers support the more flexible .p2align directive; all recent GNU-based assemblers for example.

For me I encountered the problem because I have both Python 2 and Python 3 installed, Python 2 treats strings as byte arrays, and Python 3 treats them as arrays of UTF-8 encoded characters. As a solution, try using formatting such as b"\0x90" instead of "\0x90" in your call to pset arg.

2021年3月5日 · Here's the method where the exception happens. Looks like it tries to guess the correct encoding first, but still got it wrong, since it simply looks for something like # -*- coding: utf-8 -*-at the top of the file to make a guess, and falls back to utf-8.

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According to specification of UTF-8 the symbol can't start with binary 10. Instead it can start with binary 0, otherwise with bin 110, 1110, 11110, and the remaining bytes will start with first bit 1.