Question about assembly in set bit function for x86 architecture
Anuz Pratap Singh Tomar
chambilkethakur at gmail.com
Sun Apr 19 17:13:20 EDT 2015
On Sun, Apr 19, 2015 at 9:51 PM, nick <xerofoify at gmail.com> wrote:
> Greetings All,
> I am wondering what the below code in the asm modifier does:
> static inline void set_bit(int nr, void *addr)
> asm("btsl %1,%0" : "+m" (*(u32 *)addr) : "Ir" (nr));
> This would be very helpful as I am new to x86 assembly and don't
> even known what register(s)/instruction(s) this touches and therefore this
> is impossible for me to look up in the Intel Manuals. If someone either
> tells me the registers/instructions this uses or explains the code that
> would be very helpful.
> Kernelnewbies mailing list
> Kernelnewbies at kernelnewbies.org
get a book on i86 assembly and learn it.
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