EQU directive in GAS assembly

Question

Why does .equ directive not work in gas in this way:

.equ Mark64, 8(%rsi)

while it works in this (note: .text section, where Mark32 is located, is set to r/w in this case):

Mark32 EQU DWORD PTR [ESI + 4]

How can i make Mark64 work in GAS (.set also doesn't work)?

Thanks in advance!

Answer 1

Data section:

MarksTable:
    .quad Mark64_1
    .quad Mark64_2
    .quad Mark64_3

where Mark64_x is just a label in code section.

And then I've just placed my MarksTable into reg:

movq MarksTable, %rsi

After all I could access Mark64_2 for instance from rsi like this:

callq   *0x8(%rsi)