arch/xtensa: set the current reg before print syslog

ensure the semantics of the up_interrupt_context() works as expected

Signed-off-by: chao.an <anchao@xiaomi.com>

arch/xtensa/src/common/xtensa_assert.c

@@ -189,6 +189,8 @@ void up_assert(const char *filename, int lineno)
 
 void xtensa_panic(int xptcode, uint32_t *regs)
 {
+  CURRENT_REGS = regs;
+
   /* We get here when a un-dispatch-able, irrecoverable exception occurs */
 
   board_autoled_on(LED_ASSERTION);
@@ -203,7 +205,6 @@ void xtensa_panic(int xptcode, uint32_t *regs)
   _alert("Unhandled Exception %d\n", xptcode);
 #endif
 
-  CURRENT_REGS = regs;
   xtensa_assert(); /* Should not return */
   for (; ; );
 }
@@ -290,6 +291,8 @@ void xtensa_panic(int xptcode, uint32_t *regs)
 
 void xtensa_user_panic(int exccause, uint32_t *regs)
 {
+  CURRENT_REGS = regs;
+
   /* We get here when a un-dispatch-able, irrecoverable exception occurs */
 
   board_autoled_on(LED_ASSERTION);
@@ -305,7 +308,6 @@ void xtensa_user_panic(int exccause, uint32_t *regs)
   _alert("User Exception: EXCCAUSE=%04x\n", exccause);
 #endif
 
-  CURRENT_REGS = regs;
   xtensa_assert(); /* Should not return */
   for (; ; );
 }