While running a program I've written in assembly, I get Illegal instruction error. Is there a way to know which instruction is causing the error, without debugging that is, because the machine I'm ...

Test platform is 32 bit Linux. Basically, I know gcc can be used to generate both Intel and At&T style assembly code, but it seems that you can not directly use nasm/tasm to compile the Inte...

For example if I have a variable named test declared like: test db 0x01 ;suppose the address is 0x00000052 If I do something like: mov rax, test ;rax = 0x00000052 mov rax, [test] ;rax = 0x01 ...

While learning assembly language from a book there is a listing showing some basic operations: segment .data a dq 176 b dq 4097 segment .text global _start _start: mov rax, [a] ; Move a into ra...

I have a function foo written in assembly and compiled with yasm and GCC on Linux (Ubuntu) 64-bit. It simply prints a message to stdout using puts(), here is how it looks: bits 64 extern puts glo...

I'm investigating a minimal opcode size x86-64 strlen implementation for my code golfing / binary executable that is not supposed to exceed some size (think of demoscene for simplicity). General id...

I have a bunch of magic numbers that I would like to include in both a C program and an assembly file to be compiled by nasm or yasm. In plain C the file would look something a series of defines, ...

I am trying to assemble the code below using yasm. I have put 'here' comments where yasm reports the error "error: invalid size for operand 2". Why is this error happening ? segment .data a db 25...

I got a strange problem. I tried to install x264. When run sudo ./configure --enable-shared, it gave: Found no assembler Minimum version is yasm-0.7.0 If you really want to compile without asm, c...

Let's say I have the following main loop .L2: vmulps ymm1, ymm2, [rdi+rax] vaddps ymm1, ymm1, [rsi+rax] vmovaps [rdx+rax], ymm1 add rax, 32 jne .L2 The way I would time this is to put it in...

I am trying to write FizzBuzz in Assembly and I am seeing segmentation fault all the time. So far I have determined that it is not my printing routines (because I have removed their contents and th...

The GNU assembler gives an unexpected memory operand when assembling Intel syntax code. I have reduced my bug to one single lonely line of code, and for the last three days I've tried anything to ...

What are the sizes of tword, oword and yword operands, as used in the NASM/YASM manual? And on a related note, is there a trick or underlying idea to these names? Is there a way by which bigger wor...

I've got code assembling using yasm, and linking into my C++ program, but I can't set breakpoints in gdb on symbols from the assembly language file. The command lines probably aren't terribly illu...

I've already searched a long time on stackoverflow and other make manuals, websites but cannot find any trailing whitespace or miss usage in make functions. Can you help me solve this warning messa...

Suppose I have the following declared: section .bss buffer resb 1 And these instructions follow in section .text: mov al, 5 ; mov-immediate mov [buffer], al ; store mov bl, [buffer] ; load mov ...

I want to compile and execute a very simple program in 64 bit. section .text global _start _start: mov rdx,len mov rcx,msg mov rbx,1 mov rax,4 int 0x80 mov rbx,0 mov rax,1 int 0x...

Linux Assembly Tutorial states: there is one very important thing to remember: If you are planning to return from a procedure (with the RET instruction), don't jump to it! As in "never!" Doing t...