Pejman Moghadam / Assembly

Linux Assembly - cpuid (AT-T)

Public domain

---

Compile with GNU assembler (as)

/*
 * Sample program to extract the processor Vendor ID
 * Filename : cpuid.s
 * Compile  : as -o cpuid.o cpuid.s
 * Link     : ld -o cpuid cpuid.o
 *
 */

.section .data
output:
        .ascii "The processor Vendor ID is 'xxxxxxxxxxxx'\n"
.section .text
.global _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

---

Compile with GNU C Compiler (gcc)

/*
 * Sample program to extract the processor Vendor ID
 * Filename : cpuid.s
 * Compile & Link :  gcc -o cpuid.o cpuid.s
 *
 */

.section .data
output:
        .ascii "The processor Vendor ID is 'xxxxxxxxxxxx'\n"
.section .text
.global main
main:
        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

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BY: Pejman Moghadam
TAG: asm, gcc, cpuid
DATE: 2013-01-05 14:46:03

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Pejman Moghadam / Assembly [ TXT ]