convert.s

汇编代码示例

# convert.s - Converting lower to upper case
.section .data
string1:
   .asciz "This is a TEST, of the conversion program!\n"
length:
   .int 43
.section .text
.globl _start
_start:
   nop
   leal string1, %esi
   movl %esi, %edi
   movl length, %ecx
   cld
loop1:
   lodsb
   cmpb $'a', %al
   jl skip
   cmpb $'z', %al
   jg skip
   subb $0x20, %al
skip:
   stosb
   loop loop1
end:
   pushl $string1
   call printf
   addl $4, %esp
   pushl $0
   call exit