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Does anyone understand how to work with `MASKMOVDQU`, cus I’m stuck by it’s instruction from the page 902 of the Intel x64 manual . I am confused on how to […]
In x86 64 machine code, when the `movl` instruction is used with a register destination, it zeroes the higher order bytes of the 64 bit register. How can I use […]
I have implemented a custom memory allocation function using `sys_mmap` for memory allocation. Here’s my code for the `malloc_` function: malloc_: pushq %rbp movq %rsp, %rbp mov %rdi, %rcx # […]
I encountered an issue when injecting my assembly program **asm.txt** into a **portable executable file** to run a keylogger using `CreateThread`. `CreateThread` was failing with the error code `0x3E6 (ERROR_NOACCESS)`. […]
I want to understand why any scalar version of the inner product procedure cannot achieve a CPE less than `1.00` on an Intel Core i7 4790 Haswell processor, Ubuntu 20.04 […]
In my last question, I misunderstood how GDB interprets memory when using different formats like `x/d` and `x/1wd`. After some digging, I realized the issue was related to GDB displaying […]
I’ve come across a specific instruction sequence that I need help understanding, particularly the comparison (`cmp`) operation and how to break at this point in GDB on an Intel Core […]
I’m working with x86-64 architecture in long mode and want to know if it’s possible to directly update the Translation Lookaside Buffer (TLB) with a mapping from a virtual address […]
I want to inject a 64 bit DLL into a 64 bit process on OpenBSD. The shellcode needs to push several 64 bit values onto the stack, including the old […]
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