On Wed, Dec 16, 2009 at 08:29:25PM -0800, Matt Helsley wrote:
> On Fri, Dec 04, 2009 at 11:02:28PM -0600, Nathan Lynch wrote:
<snip>
> > /* Set up arguments for system call. */
> > - mr r3,r5 /* flags */
> > - mr r4,r7 /* clone_args */
> > - mr r5,r8 /* clone_args' size */
> > - mr r6,r9 /* pids */
> > + mr r3,r4 /* flags */
> > + mr r4,r6 /* clone_args */
> > + mr r5,r7 /* clone_args' size */
> > + mr r6,r8 /* pids */
>
> Wouldn't it be possible to avoid some mr instructions above by re-arranging
(The 4 immediately above)
> the function arguments? Then you're just saving things in the two non-volatile
> gprs before making the eclone syscall. I think this amounts to making the
> prototype:
>
> int [r3] eclone(int flags [r3],
> struct clone_args *args [r4],
> size_t args_size [r6],
> pid_t *pids [r7],
> int (*fn)(void *arg) [r8],
> void *fn_arg [r9]);
Argh, should've been:
int [r3] __eclone(int flags [r3],
struct clone_args *args [r4],
size_t args_size [r5],
pid_t *pids [r6],
int (*fn)(void *arg) [r7],
void *fn_arg [r8]);
Cheers,
-Matt
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