Reference material for x86-64 assembly on Linux

[amit mehta]

Folks, Can you please suggest me some nice books or tutorials
that concentrates more on the x86_64 assembly programming
using GNU assembler. Unfortunately, I haven't done any assembly
programming for the last seven years, but my current job requires
me to analyse kernel crashes and a lot of them (probably due to
widespread use of x86-64 architecture) originate on x86-64 machines
and quite often disassembling is the last resort to inspect the function
parameters, stack frames etc.

There seem to tons of books, tutorials, assemblers available over the
internet, but  I'm looking for something that can give me jumpstart on
x86_64 assembly, specially in Linux environment.

Recently, While browsing, I've found these two:
1: x86_64 ABI (System V Application Binary Interface,
AMD64 Architecture Processor Supplement) -
2: x86-64 Machine-Level Programming - Randal and David

Appreciate a lot, If you can recommend me your favourite text book
on x86-64 assembly or any such reference material.

Thanks,
-Amit