[okl4-developer] Error while building WOMBAT using ARMV7 tooolchain [strex/ldrex related error]

[Akshay]

Hi all,
I got the problem we need to make --march=armv6/7


Akshay wrote:
> 
> Hi all,
> I am getting the following error while building using ARMV7 toolchain.
> 
> {standard input}:599: Error: selected processor does not support `ldrex
> r1,[r2]'
> {standard input}:601: Error: selected processor does not support `strex
> r3,r1,[r2]'
> 
> For example the following code uses strex and ldrex but it is not
> specified which register to use.
> 
> static inline int atomic_add_return(int i, atomic_t *v)
> {
>     unsigned long tmp;
>     int result;
> 
>     __asm__ __volatile__("@ atomic_add_return\n"
> "1: ldrex   %0, [%2]\n"
> "   add %0, %0, %3\n"
> "   strex   %1, %0, [%2]\n"
> "   teq %1, #0\n"
> "   bne 1b"
>     : "=&r" (result), "=&r" (tmp)
>     : "r" (&v->counter), "Ir" (i)
>     : "cc");
> 
>     return result;
> }
> 
> 
> According to arm architecture reference manual strex/ldrex are valid for
> ARMV6 and above. 
> I dont know how to solve this issue Any toolchain specific
> CFLAGS/attributes i need to set/unset. Please Help
> 
> Warm Regards,
> Akshay
> 
> 
> 
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