The resources are hard to comprehend and general understand is (in my case at least) being done with a lot of Stack Overflow answers. So, let’s make some notes and consolidate all the learnings together

AT&T general syntax is src, dest

The Symbols ($,%,*)

• $ is a prefix is for immediates (constants)
• % prefix is for registers (they are required)
• * indicates an absolute jump, in contrast with the absense of the asterisk meaning a relative jump.
• ( ____ ) is used for dereferncing a memory location. Dereferncing is to, access the value at address ____

Ref: $,%, *

Absolute(*0xADDR) and Relative Jump (0xADDR)

A jump instruction moves the instruction pointer to a new location. It’s the machine language equivalent of goto. Absolute jumps move the instruction pointer to an absolute address. A relative jump jumps to an address specified relative to the current instruction pointer. Ref

References

• AT&T vs Intel
• popfl,pushfl,lahf,sahf
• rdtsc
• Jump commands
• https://stackoverflow.com/questions/30802831/x86-jmp-asterisk-eax
• https://stackoverflow.com/questions/54066242/att-x86-what-does-xadd-eax-ecx-do/54066448#54066448
• https://stackoverflow.com/questions/54065871/x86-att-what-does-add-instruction-do-using-memory-addressing?noredirect=1#comment94965407_54065871
• https://gist.github.com/mishurov/6bcf04df329973c15044
• https://c9x.me/x86/html/file_module_x86_id_26.html
• http://flint.cs.yale.edu/cs421/papers/x86-asm/asm.html
• https://stackoverflow.com/questions/42887105/x86-assembly-memory-what-does-the-add-instruction-do
• https://stackoverflow.com/questions/7544672/im-not-exactly-sure-what-this-x86-add-instruction-is-doing
• https://stackoverflow.com/questions/1898834/why-would-one-use-movl-1-eax-as-opposed-to-say-movb-1-eax
• http://www.jagregory.com/abrash-zen-of-asm/#replacing-call-and-ret-with-jmp