__asm...

[Thiago Macieira]

Ralf Habacker wrote:
>Paulo Moura Guedes schrieb:
>> It seems gcc support a different inline assembly sintax:
>> asm("assembly code");
>>
>> If anyone who knows assembly would be so kind to port this to gcc
>> would be great. Documentation can be found here:
>> http://www-128.ibm.com/developerworks/library/l-ia.html
>> http://www.ibiblio.org/gferg/ldp/GCC-Inline-Assembly-HOWTO.html
>
>Can anyone tell me what the instruction
>
>    mov EAX, FS:[18h]
>
>means. Does it means
>
>    add 18hex to the value of 'fs' register and store it into eax

move 32 bits from the 0x18 bytes after FS:0 to the register EAX.

Normally, this would have been written in full form
  mov EAX, DWORD PTR FS:[18h]

In AT&T syntax, it would be:
  movl  %fs:0x18,%eax

-- 
  Thiago Macieira  -  thiago (AT) macieira.info - thiago (AT) kde.org
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1. On frumscafte, hwonne time_t wæs náht, se scieppend þone circolwyrde 
wundorcræftlíge cennede and seo eorðe wæs idel and hit wæs gód.
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