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The letter q refers to a “quad” word, or an 8 byte or 64 bit value. Most x86 code these days works with 64 bit or 32 bit values, so you'll most often see instructions that end with q or l. Other suffixes are w for word (16 bits or 2 bytes) or b for 1 byte or 8 bits.
The GNU Assembler, commonly known as gas or as, is the assembler developed by the GNU Project. It is the default back-end of GCC. It is used to assemble the GNU operating system and the Linux kernel, and various other software. It is a part of the GNU Binutils package.
Intel Syntax Support Today, GAS supports both syntax sets (. intel_syntax and the default . att_syntax), and even allows disabling the otherwise mandatory operand prefixes '%' or '$' (... _syntax noprefix).
I am curious to know is there any special GAS syntax to achieve the same like in NASM example:
SECTION .data
msg: db "Hello World",10,0 ; the 0-terminated string.
len: equ $-msg ; "$" means current address.
Especially I'm interested in the symbol $ representing the current address.
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