Jian-Xin Lai wrote:
> Hi,
>
> The kernel version is 2.6.20.7. In include/asm-i386/string.h, line 169~185:
> static inline char * strrchr(const char * s, int c)
> {
> int d0, d1;
> register char * __res;
> __asm__ __volatile__(
> "movb %%al,%%ah\n"
> "1:\tlodsb\n\t"
> "cmpb %%ah,%%al\n\t"
> "jne 2f\n\t"
> "leal -1(%%esi),%0\n" (*)
> "2:\ttestb %%al,%%al\n\t"
> "jne 1b"
> :"=g" (__res), "=&S" (d0), "=&a" (d1) (**)
> :"0" (0),"1" (s),"2" (c)
> :"memory");
> return __res;
> }
>
> The 'lea' instruction needs a register here (*), but "g" (**) means
> any registers, memory or immediate integer. Is it correct? If the
> compiler do not place the __res into a register, the compilation will
> fail. Should it be "r"?
> Thank you very much.
>
Yes, it should be "r", and it looks like the author hacked around the
fact they had the wrong constraints by using the "register" keyword on
the variable declaration.
-hpa
-
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