I came across this code in RE4B book, page 66:
$SG2923 DB 'a=%d; b=%d; c=%d; d=%d; e=%d; f=%d; g=%d; h=%d', 0aH, 00H
main PROC
sub rsp, 88
mov DWORD PTR [rsp+64], 8
mov DWORD PTR [rsp+56], 7
mov DWORD PTR [rsp+48], 6
mov DWORD PTR [rsp+40], 5
mov DWORD PTR [rsp+32], 4
mov r9d, 3
mov r8d, 2
mov edx, 1
lea rcx, OFFSET FLAT:$SG2923
call printf
xor eax, eax
add rsp, 88
ret 0
main ENDP
_TEXT ENDS
END
Why did the compiler decide to reference the arguments starting from [rsp+64] till [rsp+32]?
Shouldn't the last argument be at [rsp]?
Why it didn't start from [rsp+32] till [rsp] so the callee can reference its arguments from [rsp]?
Or this is something due to that the first 3 arguments are being passed in registers?
You can notice that GCC is doing what I am trying to say, starting referencing & finishing at [rsp]:
