[LinuxKernel][ARM] Aarch64: How stack is pushed in Aarch64?

[1]: SP address is now FFFFFFEB67BE7A40

[2]: With "str     x21,[SP,#-0x30]!" instruction, the stack is pushed up to 0x30 byte.

[3]: X19 and X20 is pushed into stack.

[4]: X29 and X30 is pushed into stack.

15 collision = find_worker_executing_work(pool, work);

16 if (unlikely(collision)) {

17 move_linked_works(work, &collision->scheduled, NULL);

18 return;

19 }

ZSX:FFFFFF8B40CE71B8|F81D0FF5  set_next_entity:  str     x21,[SP,#-0x30]!   ; x21,[SP,#-48]!  //<<--[2]

ZSX:FFFFFF8B40CE71BC|A9014FF4                    stp     x20,x19,[SP,#0x10]   ; x20,x19,[SP,#16] //<<--[3]

ZSX:FFFFFF8B40CE71C0|A9027BFD                    stp     x29,x30,[SP,#0x20]   ; x29,x30,[SP,#32] //<<--[4]

ZSX:FFFFFF8B40CE71C4|910083FD                    add     x29,SP,#0x20     ; x29,SP,#32

ZSX:FFFFFF8B40CE71C8|AA0103F3____________________mov_____x19,x1

_____________address|_data____________________|value_____________|symbol

ZSD:FFFFFFEB67BE79F8| 80 7B AB 65 EB FF FF FF  0xFFFFFFEB65AB7B80

ZSD:FFFFFFEB67BE7A00| 28 50 5D 79 EB FF FF FF  0xFFFFFFEB795D5028

ZSD:FFFFFFEB67BE7A08| 00 EA 40 68 EB FF FF FF  0xFFFFFFEB6840EA00

ZSD:FFFFFFEB67BE7A10| 00 00 00 00 00 00 00 00  0x0  //<<--[2]

ZSD:FFFFFFEB67BE7A18| 00 00 00 00 00 00 00 00  0x0

ZSD:FFFFFFEB67BE7A20| 20 00 00 00 00 00 00 00  0x20

ZSD:FFFFFFEB67BE7A28| 19 00 00 00 00 00 00 00  0x19  //<<--[3]

ZSD:FFFFFFEB67BE7A30| 29 00 00 00 00 00 00 00  0x29

ZSD:FFFFFFEB67BE7A38| 80 3A CE 40 8B FF FF FF  0xFFFFFF8B40CE3A80 \\vmlinux\fair\pick_next_task_fair+0x4A8 //<<--[4]

ZSD:FFFFFFEB67BE7A40| A0 7A BE 67 EB FF FF FF  0xFFFFFFEB67BE7AA0 //<<--[1]