diff options
Diffstat (limited to 'arch/tile/kernel/intvec_32.S')
| -rw-r--r-- | arch/tile/kernel/intvec_32.S | 46 |
1 files changed, 14 insertions, 32 deletions
diff --git a/arch/tile/kernel/intvec_32.S b/arch/tile/kernel/intvec_32.S index fbbe2ea..33d4881 100644 --- a/arch/tile/kernel/intvec_32.S +++ b/arch/tile/kernel/intvec_32.S @@ -846,18 +846,6 @@ STD_ENTRY(interrupt_return) FEEDBACK_REENTER(interrupt_return) /* - * Use r33 to hold whether we have already loaded the callee-saves - * into ptregs. We don't want to do it twice in this loop, since - * then we'd clobber whatever changes are made by ptrace, etc. - * Get base of stack in r32. - */ - { - GET_THREAD_INFO(r32) - movei r33, 0 - } - -.Lretry_work_pending: - /* * Disable interrupts so as to make sure we don't * miss an interrupt that sets any of the thread flags (like * need_resched or sigpending) between sampling and the iret. @@ -867,33 +855,27 @@ STD_ENTRY(interrupt_return) IRQ_DISABLE(r20, r21) TRACE_IRQS_OFF /* Note: clobbers registers r0-r29 */ - - /* Check to see if there is any work to do before returning to user. */ + /* + * See if there are any work items (including single-shot items) + * to do. If so, save the callee-save registers to pt_regs + * and then dispatch to C code. + */ + GET_THREAD_INFO(r21) { - addi r29, r32, THREAD_INFO_FLAGS_OFFSET - moveli r1, lo16(_TIF_ALLWORK_MASK) + addi r22, r21, THREAD_INFO_FLAGS_OFFSET + moveli r20, lo16(_TIF_ALLWORK_MASK) } { - lw r29, r29 - auli r1, r1, ha16(_TIF_ALLWORK_MASK) + lw r22, r22 + auli r20, r20, ha16(_TIF_ALLWORK_MASK) } - and r1, r29, r1 - bzt r1, .Lrestore_all - - /* - * Make sure we have all the registers saved for signal - * handling, notify-resume, or single-step. Call out to C - * code to figure out exactly what we need to do for each flag bit, - * then if necessary, reload the flags and recheck. - */ + and r1, r22, r20 { PTREGS_PTR(r0, PTREGS_OFFSET_BASE) - bnz r33, 1f + bzt r1, .Lrestore_all } push_extra_callee_saves r0 - movei r33, 1 -1: jal do_work_pending - bnz r0, .Lretry_work_pending + jal prepare_exit_to_usermode /* * In the NMI case we @@ -1327,7 +1309,7 @@ STD_ENTRY(ret_from_kernel_thread) FEEDBACK_REENTER(ret_from_kernel_thread) { movei r30, 0 /* not an NMI */ - j .Lresume_userspace /* jump into middle of interrupt_return */ + j interrupt_return } STD_ENDPROC(ret_from_kernel_thread) |
