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#cpuid.s Sample program to extract the processor Vendor ID
.section .data
output:
   .ascii "The processor Vendor ID is 'xxxxxxxxxxxx'\n"
.section .text
.globl _start
_start:
   movl $0, %eax
   cpuid
   movl $output, %edi
   movl %ebx, 28(%edi)
   movl %edx, 32(%edi)
   movl %ecx, 36(%edi)
   movl $4, %eax
   movl $1, %ebx
   movl $output, %ecx
   movl $42, %edx
   int $0x80
   movl $1, %eax
   movl $0, %ebx
   int $0x80

prog.s: Assembler messages:
prog.s:0: Warning: end of file not at end of a line; newline inserted
/home/QUcPW9/ccAThkpK.o: In function `_start':
(.text+0x0): multiple definition of `_start'
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/../../../crt1.o:(.text+0x0): first defined here
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/../../../crt1.o: In function `_start':
(.text+0x18): undefined reference to `main'
collect2: ld returned 1 exit status

Standard output is empty