This question already has answers here: Closed 9 years ago. Possible Duplicate: x86 Assembly – ‘testl’ eax against eax? I’m very very new to assembly language programming, and I’m currently trying to read the assembly language generated from a binary. I’ve run across test %eax,%eax or test %rdi, %rdi, etc. etc. I’m very confused as … Read more
I’m doing some assembly-level debugging in GDB. Is there a way to get GDB to show me the current assembly instruction in the same way that it shows the current source line? The default output after every command looks like this: 0x0001433f 990 Foo::bar(p); This gives me the address of the current instruction, but I … Read more
What is the difference between object code, machine code and assembly code? Can you give a visual example of their difference? 10 Answers 10
Once upon a time, to write x86 assembler, for example, you would have instructions stating “load the EDX register with the value 5”, “increment the EDX” register, etc. With modern CPUs that have 4 cores (or even more), at the machine code level does it just look like there are 4 separate CPUs (i.e. are … Read more
How do you run a program all by itself without an operating system running? Can you create assembly programs that the computer can load and run at startup, e.g. boot the computer from a flash drive and it runs the program that is on the CPU? 4 Answers 4
For me, it just seems like a funky MOV. What’s its purpose and when should I use it? 17 s 17
