On 14/11/10 16:10, Graeme Russ wrote:
> On 13/11/10 22:18, Graeme Russ wrote:
>> On 13/11/10 19:20, Albert ARIBAUD wrote:
>>> Le 13/11/2010 05:16, Graeme Russ a écrit :
>>>
> static inline void *get_gd_ptr(void)
> {
> void *gd_ptr;
>
> asm volatile("gs mov 0, %0\n" : "=r" (gd_ptr));
> return gd_ptr;
> }
>
static inline gd_t *get_gd_ptr(void)
{
gd_t *gd_ptr;
asm volatile("fs mov 0, %0\n" : "=r" (gd_ptr));
return gd_ptr;
}
works a treat :)
Is there any reason the other arches could not implement an inline function
as well? ARM for example:
-#define DECLARE_GLOBAL_DATA_PTR register volatile gd_t *gd asm ("r8")
+static inline gd_t *gd(void)
+{
+ gd_t *gd_ptr;
+
+ asm volatile("mov r8, %0\n" : "=r" (gd_ptr));
+ return gd_ptr;
+}
Is the compiler smart enough to optimise out and not increase code size?
If so, all the arches can have identical implementations for using global data
Regards,
Graeme
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