lodsd
Load doubleword from string
Loads the doubleword at [rsi] into eax, then advances rsi by 4, backward when DF is set.
386 and later
CFPFAFZFSFDFOF –––––––
- Changes no flag
- Reads DF
Forms
lodsd
The d suffix selects an element of 4 bytes. After each element, the instruction increases rsi by 4 when DF = 0, or decreases rsi by 4 when DF = 1. In 64-bit mode the default addresses use rsi. The a32 address-size prefix instead uses esi; 16-bit string addressing is unavailable.
rep repeats until the counter reaches zero. The counter is rcx by default or ecx with a32. If it starts at zero, a repeated instruction accesses no element. The data width is independent of this address and counter width.
global _start
section .text
_start:
mov rax, 12
mov rbx, 5
mov rcx, 3
mov rsi, 9
lodsd
mov rax, 60 ; syscall 60: exit
xor rdi, rdi
syscall