95 lines
1.6 KiB
NASM
95 lines
1.6 KiB
NASM
global _start
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section .data
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arr db 5, 7, 3, 1, 2
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arrEnd:
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buff times 32 db 0
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buffend:
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count dq 0
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section .text
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default rel
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_start:
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mov al, 0xFF
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lea rsi, [arr]
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lea rdi, [arrEnd]
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.while:
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movzx rbx, byte [rsi] ; текущее число
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cmp rbx, rax
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cmovl rax, rbx
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inc rsi
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cmp rsi, rdi
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jne .while
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call print_num_to_buf
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mov rdx, [count]
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call write_text
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mov rax, 60
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mov rdi, 0
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syscall
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; Функция выводит buff
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; In:
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; - RSI - начало буфера
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; - RDX - размер буфера
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; Регистры не изменяет
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write_text:
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push rax
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push rdi
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push rsi
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push rdx
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mov rax, 1 ; sys_write
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mov rdi, 1 ; stdout
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syscall
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mov [count], rax
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pop rdx
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pop rsi
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pop rdi
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pop rax
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ret
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; Функция выводит число в buff
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; In: RAX
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; Out: RSI - указатель на начало строки
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print_num_to_buf:
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lea rsi, [buffend]
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dec rsi
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mov rdi, rsi ; сохранить последний адрес
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mov byte [rsi], 0 ; вписать нуль
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dec rsi
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mov byte [rsi], 0xA ; вписать перенос строки
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dec rsi
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mov byte [rsi], '0'
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test rax, rax
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jz .return
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mov rcx, 10 ; десятичный делитель
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.while:
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xor rdx, rdx
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test rax, rax
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jz .break
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div rcx
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or dl, 0x30
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mov [rsi], dl
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dec rsi
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jmp .while
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.break:
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inc rsi
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.return:
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sub rdi, rsi
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inc rdi
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mov [count], rdi
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ret
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