Questions about x86-64
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How do you understand 'REX.W + B8+ rd io' form for x86-64 assembly?
I was originally trying to generate the bytes for an immediate move into a 64 bit register.The specific operation I wanted was
mov rdi, 0x1337
Using https://www.felixcloutier.com/x86/mov, the only no...
Happy Jerry
Votes: 0
Answers: 1
RIP register doesn't understand valid memory address
I'm trying to write a buffer overflow payload but when I was testing in gdb the RIP can't seem to understand a memory address holding the \x90 byte.
My code is like this
1 #include <stdio.h&g...
Jace Zoodiac
Votes: 0
Answers: 0
Returning from a signal handler without going the kernel + userspace interrupts
This is a followup on my older question: Returning from a signal handler via setcontext
I tried to write the assembly for doing the context switch from a signal handler back to the interrupted context...
Petr Skocik
Votes: 0
Answers: 0
Why is divsd not much slower than mulsd in this benchmark?
Someone told me the factor of speed differences is about 40x. Curious, I wrote a benchmark. It required some help from greybeards who were more knowledgeable about what might be optimizing out, but af...
mas
Votes: 0
Answers: 0