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. > + 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
