The square brackets essentially work like a dereference operator (e.g., like * in C). So, something like mov REG, x moves the value of x into REG, whereas mov REG, [x] moves the value of the memory location where x points to into REG. Note that if x is a label, its value is the … Read more
Looking at the nasm source, it looks like: ‘oword”https://stackoverflow.com/”DO’ is 8 times as big as “word” (O for “octoword”), synonymous with dqword (“double-quad”); that would be 128 bits, corresponding to the size of an SSE vector register. ‘tword”https://stackoverflow.com/”DT’ is 80 bits (T for “ten bytes”), the full size of an Intel x87 floating point register. … Read more
Recently I experienced a crash due to a 132 exit status code (128 + 4: program interrupted by a signal + illegal instruction signal). Here’s how I figured out what instruction was causing the crash. First, I enabled core dumps: $ ulimit -c unlimited Interestingly, the folder from where I was running the binary contained … Read more