sub $0x10,%rsp allocates space on the stack, it’s the same as doing pushq 0 twice except that the value in the allocated stack space will not necessarily be zero, but this is ok since the mov instructions used later replace the garbage with real data. As Michael rightly stated the mov $0x0,%eax is because printf … Read more
gas is primarily intended as a compiler backend, not for human use. As such, it’s lacking some features, among others this one. You can of course try to make a macro to do this, something along these lines: .intel_syntax noprefix .globl main .macro local head, tail:vararg # assume dwords for simplicity .set localsize, localsize + … Read more
Your code could be simplified a lot (and simpler code usually means that it’s simpler to find any mistakes). Here’s an outline of an easier way of doing this (I’ll leave it up to you to implement it in x86 assembly): void to_bin_string(unsigned input) { char output[33]; // The number of binary digits needed to … Read more