[XTENSA] Remove unused code

We will never (need to) support signal handling coming from a
double exception. There are too many things that could go wrong
and delivering signals is not the fastest method for IPC, anyway.

Signed-off-by: Chris Zankel <chris@zankel.net>

diff --git a/arch/xtensa/kernel/entry.S b/arch/xtensa/kernel/entry.S
index b4b14a5..b51ddb0 100644 (file)
--- a/arch/xtensa/kernel/entry.S
+++ b/arch/xtensa/kernel/entry.S
@@ -28,7 +28,6 @@
 
 /* Unimplemented features. */
 
-#undef SIGNAL_HANDLING_IN_DOUBLE_EXCEPTION
 #undef KERNEL_STACK_OVERFLOW_CHECK
 #undef PREEMPTIBLE_KERNEL
 #undef ALLOCA_EXCEPTION_IN_IRAM
@@ -431,11 +430,8 @@ common_exception_return:
        _bbsi.l a4, TIF_NEED_RESCHED, 3f
        _bbci.l a4, TIF_SIGPENDING, 4f
 
-#ifndef SIGNAL_HANDLING_IN_DOUBLE_EXCEPTION
        l32i    a4, a1, PT_DEPC
        bgeui   a4, VALID_DOUBLE_EXCEPTION_ADDRESS, 4f
-#endif
-
        /* Reenable interrupts and call do_signal() */
 
        wsr     a3, PS
@@ -1247,16 +1243,6 @@ fast_syscall_spill_registers_fixup:
         * Note: This frame might be the same as above.
         */
 
-#ifdef SIGNAL_HANDLING_IN_DOUBLE_EXCEPTION
-       /* Restore registers we precautiously saved.
-        * We have the value of the 'right' a3
-        */
-
-       l32i    a7, a2, PT_AREG5
-       l32i    a11, a2, PT_AREG6
-       l32i    a15, a2, PT_AREG7
-#endif
-
        /* Setup stack pointer. */
 
        addi    a2, a2, -PT_USER_SIZE
@@ -1290,14 +1276,6 @@ fast_syscall_spill_registers_fixup_return:
        s32i    a2, a3, EXC_TABLE_PARAM
        l32i    a2, a3, EXC_TABLE_KSTK
 
-#ifdef SIGNAL_HANDLING_IN_DOUBLE_EXCEPTION
-       /* Save registers again that might be clobbered. */
-
-       s32i    a7, a2, PT_AREG5
-       s32i    a11, a2, PT_AREG6
-       s32i    a15, a2, PT_AREG7
-#endif
-
        /* Load WB at the time the exception occurred. */
 
        rsr     a3, SAR                 # WB is still in SAR