I've found lots of resources for x86, but considerably less for x64. Pentester Academy has a promising course on it, along with shellcoding, but I'm not sure what else is out there.
Ask HN: What's the best resource for learning modern x64 assembly?
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Re: Ask HN: What's the best resource for learning modern x64 assembly?
#2As far as I know, x86_64 added instructions, modes and memory address changes but the assembly is the same?
https://software.intel.com/en-us/articles/introduction-to-x6...
I mean, you have different modes, and in 64-bit mode EAX becomes RAX for example.
Re: Ask HN: What's the best resource for learning modern x64 assembly?
#3Here is a book on computer architecture that has a good section on x86-64 assembly language. Please note that I have edited this comment to reflect a change suggested by a cold comment. This book (the third edition) introduces x86-64 assembly very well.
Re: Ask HN: What's the best resource for learning modern x64 assembly?
#4Here is a book on computer architecture that has a good section on x86-64 assembly language. Please note that I have edited this comment to reflect a change suggested by a cold comment. This book (the third edition) introduces x86-64 assembly very well. https://csapp.cs.cmu.edu/
Excellent recommendation, but why the 2nd edition? The home page[0] defaults to the latest one which is based on x64 from the get go.
Re: Ask HN: What's the best resource for learning modern x64 assembly?
#5As far as I know, x86_64 added instructions, modes and memory address changes but the assembly is the same? https://software.intel.com/en-us/articles/introduction-to-x6... I mean, you have different modes, and in 64-bit mode EAX becomes RAX for example.
I agree with this, if you are competent at 32-bit those skills are going to translate. It is mostly the same.
Some exceptions that come to mind:
* The old floating point stuff is gone. EDIT: guess I am wrong on that, was thinking of what compilers typically generate for the architecture.
* The C abi now tends to focus on pass-by-register for the first few arguments.
* If you are working in kernel mode, some stuff is going to necessarily look different.
Re: Ask HN: What's the best resource for learning modern x64 assembly?
#6Re: Ask HN: What's the best resource for learning modern x64 assembly?
#7For a soft intro to assembler, you can play video games Human Resource Machine.
Re: Ask HN: What's the best resource for learning modern x64 assembly?
#8Here is a book on computer architecture that has a good section on x86-64 assembly language. Please note that I have edited this comment to reflect a change suggested by a cold comment. This book (the third edition) introduces x86-64 assembly very well. https://csapp.cs.cmu.edu/
Excellent recommendation, but why the 2nd edition? The home page[0] defaults to the latest one which is based on x64 from the get go. [0] https://csapp.cs.cmu.edu/
First result in DDG for the book title ;-) But the third edition is the one I like. Thank you.
Re: Ask HN: What's the best resource for learning modern x64 assembly?
#9Honestly? Learn old-style 8086 assembly, then 386 code. The new stuff may be architecturally simpler in many ways, but it sits as an edge case on top of a very thick historical stack that seems completely insane if you look at it a priori.
But the early CPUs were actually quite simple! At the time "CISC" was a good thing because it provided straightforward mechanisms for expressing things (e.g. "push", "call", load a struct field with an offset...) that real world programmers needed to do all the time.
Re: Ask HN: What's the best resource for learning modern x64 assembly?
#10As far as I know, x86_64 added instructions, modes and memory address changes but the assembly is the same? https://software.intel.com/en-us/articles/introduction-to-x6... I mean, you have different modes, and in 64-bit mode EAX becomes RAX for example.
I agree with this, if you are competent at 32-bit those skills are going to translate. It is mostly the same. Some exceptions that come to mind: * The old floating point stuff is gone. EDIT: guess I am wrong on that, was thinking of what compilers typically generate for the architecture. * The C abi now tends to focus on pass-by-register for the first few arguments. * If you are working in kernel mode, some stuff is…
> * The old floating point stuff is gone.
It actually can be used, if you write by hand, at least in Windows.