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flat assembler > Main > repnz scas trouble

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moveax41h



Joined: 18 Feb 2018
Posts: 47
As you can see from my gdb gef output, I am on a repnz scas instruction (which I actually wrote as a repe scasb but apparently the gdb disassembler is off or something else happened during assembly (forgive my ignorance here)... In any event, despite the fact that it's a repnz scas, as you can see, the zero flag is actually set and this continuous to repeat, that's what I'm confused about. Actually, I found this because I'm debugging a segfault in my program and it's because this loop goes for far too long and causes a memory corruption.

In any event, here's the screenshot:


Description: gdb gef output for repnz scas even with zero flag set
Filesize: 805.72 KB
Viewed: 220 Time(s)

Screenshot from 2018-07-31 09-54-29.png



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Post 31 Jul 2018, 17:05
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