Hi, Thomas, On Tue, Jul 6, 2021 at 9:51 PM Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote: > > Chen! > > On Tue, Jul 06 2021 at 12:18, Huacai Chen wrote: > > + li.d t1, _TIF_WORK_SYSCALL_ENTRY > > + LONG_L t0, tp, TI_FLAGS # syscall tracing enabled? > > + and t0, t1, t0 > > + bnez t0, syscall_trace_entry > > + > > +syscall_common: > > + /* Check to make sure we don't jump to a bogus syscall number. */ > > + li.w t0, __NR_syscalls > > + sub.d t2, a7, t0 > > + bgez t2, illegal_syscall > > + > > + /* Syscall number held in a7 */ > > + slli.d t0, a7, 3 # offset into table > > + la t2, sys_call_table > > + add.d t0, t2, t0 > > + ld.d t2, t0, 0 #syscall routine > > + beqz t2, illegal_syscall > > + > > + jalr t2 # Do The Real Thing (TM) > > + > > + ld.d t1, sp, PT_R11 # syscall number > > + addi.d t1, t1, 1 # +1 for handle_signal > > + st.d t1, sp, PT_R0 # save it for syscall restarting > > + st.d v0, sp, PT_R4 # result > > Please do not add _again_ TIF handling in ASM. Please use the generic > entry code infrastructure for this. It handles the complete set of TIF > bits (if enabled in config) out of the box and it does so correctly. Thanks, we are refactoring to use generic entry code. Huacai > > Thanks, > > tglx > >
