Re: Win32 inline assembly question

[Ian Lance Taylor <ian at airs dot com>]

Wei Huang <weih@google.com> writes:

>  I am trying to convert an inline assembly function (on Win32)
> 
>   NT_Tib* GetTIB()
> {
>     NT_Tib* pTib;
>     __asm
>     {
>         MOV EAX , FS:[18h]
>         MOV pTib , EAX
>     }
>     return pTib;
> }
>   to use the gcc syntax. It would be something like
> 
>   NT_Tib* GetTIB()
> {
>     NT_Tib* pTib;
> 
>     __asm__("movl %FS:0x18, %EAX\n\t"
>             "movl %EAX, pTib");
>                         ^^^ (what should this be?)
> 
> 
>     return pTib;
> }


Please read the friendly manual.

You want something like (completely untested):

    asm ("movl %fs:0x18, %eax\n\t"
         "movl %eax, %0"
         : "=rm" (pTib) : : "%eax");

Ian