On Fri, Sep 07, 2012 at 07:43:36PM +0000, Arnd Bergmann wrote:
> > + asm( "add x0, %0, %1\n\t"
> > + "mov x1, %2\n\t"
> > + "mov x2, %3\n\t"
> > + "bl memmove\n\t" /* copy regs to top of stack */
> > + "mov x27, #0\n\t" /* not a syscall */
> > + "mov x28, %0\n\t" /* thread structure */
> > + "mov sp, x0\n\t" /* reposition stack pointer */
> > + "b ret_to_user"
> > + :
> > + : "r" (current_thread_info()),
> > + "Ir" (THREAD_START_SP - sizeof(regs)),
> > + "r" (®s),
> > + "Ir" (sizeof(regs))
> > + : "x0", "x1", "x2", "x27", "x28", "x30", "memory");
This should just become ret_from_kernel_execve(); FWIW, arm variant is
ENTRY(ret_from_kernel_execve)
mov why, #0 @ not a syscall
str why, [r1, #S_R0] @ ... and we want 0 in ->ARM_r0 as well
mov r2, #S_FRAME_SIZE
bl memmove @ copy regs to normal location; return
@ value is in r0 and it's the same as
@ the first argument, so r0 is unchanged.
get_thread_info tsk @ thread structure
mov sp, r0 @ stack pointer just under pt_regs
b ret_slow_syscall
and AFAICS you want pretty much the same, modulo different registers - 'why'
(aka r8) seems to correspond to your x27, 'tsk' (aka r9) - to x28 and the rest
matches one-to-one: x1.. for arguments in place of r1.. and x0 for return value
(instead of r0)...
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