microblaze: Do not use r0_ram space for hw exception debugging

Remove hw exception counting space from r0_ram. Use special
exception_debug_table poll for exception statistic.

Signed-off-by: Michal Simek <monstr@monstr.eu>

diff --git a/arch/microblaze/kernel/hw_exception_handler.S b/arch/microblaze/kernel/hw_exception_handler.S
index 782680d..ec5e99d 100644 (file)
--- a/arch/microblaze/kernel/hw_exception_handler.S
+++ b/arch/microblaze/kernel/hw_exception_handler.S
@@ -77,6 +77,8 @@
 #include <asm/signal.h>
 #include <asm/asm-offsets.h>
 
+#undef DEBUG
+
 /* Helpful Macros */
 #define NUM_TO_REG(num)                r ## num
 
@@ -228,6 +230,16 @@
 /* wrappers to restore state before coming to entry.S */
 
 #ifdef CONFIG_MMU
+#ifdef DEBUG
+/* Create space for exception counting. */
+.section .data
+.global exception_debug_table
+.align 4
+exception_debug_table:
+       /* Look at exception vector table. There is 32 exceptions * word size */
+       .space  (32 * 4)
+#endif /* DEBUG */
+
 .section .rodata
 .align 4
 _MB_HW_ExceptionVectorTable:
@@ -329,12 +341,12 @@ not_in_delay_slot:
 
 #ifdef DEBUG
 /* counting which exception happen */
-       lwi     r5, r0, 0x200 + TOPHYS(r0_ram)
+       lwi     r5, r0, TOPHYS(exception_debug_table)
        addi    r5, r5, 1
-       swi     r5, r0, 0x200 + TOPHYS(r0_ram)
-       lwi     r5, r6, 0x200 + TOPHYS(r0_ram)
+       swi     r5, r0, TOPHYS(exception_debug_table)
+       lwi     r5, r6, TOPHYS(exception_debug_table)
        addi    r5, r5, 1
-       swi     r5, r6, 0x200 + TOPHYS(r0_ram)
+       swi     r5, r6, TOPHYS(exception_debug_table)
 #endif
 /* end */
        /* Load the HW Exception vector */