On Mon, Apr 25, 2016 at 06:26:56PM +0100, Catalin Marinas wrote: > On Wed, Apr 06, 2016 at 01:08:42AM +0300, Yury Norov wrote: > > --- a/arch/arm64/kernel/entry.S > > +++ b/arch/arm64/kernel/entry.S > > @@ -715,9 +715,13 @@ ENDPROC(ret_from_fork) > > */ > > .align 6 > > el0_svc: > > - adrp stbl, sys_call_table // load syscall table pointer > > uxtw scno, w8 // syscall number in w8 > > mov sc_nr, #__NR_syscalls > > +#ifdef CONFIG_ARM64_ILP32 > > + ldr x16, [tsk, #TI_FLAGS] > > + tbnz x16, #TIF_32BIT_AARCH64, el0_ilp32_svc // We are using ILP32 > > +#endif > > There is another ldr x16, [tsk, #TI_FLAGS] load further down in the > el0_svc_naked block. We should rework these a bit to avoid loading the > same location twice unnecessarily. E.g. move the ldr x16 just before > el0_svc_naked and branch one line after in case of the ILP32 syscall. > Yes, I thiks we can refactor it. Thanks for a catch. > > + adrp stbl, sys_call_table // load syscall table pointer > > el0_svc_naked: // compat entry point > > stp x0, scno, [sp, #S_ORIG_X0] // save the original x0 and syscall number > > enable_dbg_and_irq > > @@ -737,6 +741,12 @@ ni_sys: > > b ret_fast_syscall > > ENDPROC(el0_svc) > > > > +#ifdef CONFIG_ARM64_ILP32 > > +el0_ilp32_svc: > > + adrp stbl, sys_call_ilp32_table // load syscall table pointer > > + b el0_svc_naked > > +#endif > > + > > /* > > * This is the really slow path. We're going to be doing context > > * switches, and waiting for our parent to respond. > > -- > Catalin -- To unsubscribe from this list: send the line "unsubscribe linux-doc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
