microblaze: Change register usage for ESR and EAR

This change synchronize register usage in code.
ESR = R4
EAR = R3

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

1 files changed, 35 insertions, 35 deletions

diff --git a/arch/microblaze/kernel/hw_exception_handler.S b/arch/microblaze/kernel/hw_exception_handler.S
index ad6dbf029e6b..a652addb9321 100644
--- a/arch/microblaze/kernel/hw_exception_handler.S
+++ b/arch/microblaze/kernel/hw_exception_handler.S
@@ -313,13 +313,13 @@ _hw_exception_handler:
         mfs     r5, rmsr;
         nop
         swi     r5, r1, 0;
-        mfs     r3, resr
+        mfs     r4, resr
         nop
-        mfs     r4, rear;
+        mfs     r3, rear;
         nop
 
 #ifndef CONFIG_MMU
-        andi    r5, r3, 0x1000;         /* Check ESR[DS] */
+        andi    r5, r4, 0x1000;         /* Check ESR[DS] */
         beqi    r5, not_in_delay_slot;  /* Branch if ESR[DS] not set */
         mfs     r17, rbtr;      /* ESR[DS] set - return address in BTR */
         nop
@@ -327,7 +327,7 @@ not_in_delay_slot:
         swi     r17, r1, PT_R17
 #endif
 
-        andi    r5, r3, 0x1F;           /* Extract ESR[EXC] */
+        andi    r5, r4, 0x1F;           /* Extract ESR[EXC] */
 
 #ifdef CONFIG_MMU
         /* Calculate exception vector offset = r5 << 2 */
@@ -378,7 +378,7 @@ handle_other_ex: /* Handle Other exceptions here */
         swi     r18, r1, PT_R18
 
         or      r5, r1, r0
-        andi    r6, r3, 0x1F; /* Load ESR[EC] */
+        andi    r6, r4, 0x1F; /* Load ESR[EC] */
         lwi     r7, r0, PER_CPU(KM) /* MS: saving current kernel mode to regs */
         swi     r7, r1, PT_MODE
         mfs     r7, rfsr
@@ -428,11 +428,11 @@ handle_other_ex: /* Handle Other exceptions here */
  */
 handle_unaligned_ex:
         /* Working registers already saved: R3, R4, R5, R6
-         *  R3 = ESR
-         *  R4 = EAR
+         *  R4 = ESR
+         *  R3 = EAR
          */
 #ifdef CONFIG_MMU
-        andi    r6, r3, 0x1000                  /* Check ESR[DS] */
+        andi    r6, r4, 0x1000                  /* Check ESR[DS] */
         beqi    r6, _no_delayslot               /* Branch if ESR[DS] not set */
         mfs     r17, rbtr;      /* ESR[DS] set - return address in BTR */
         nop
@@ -441,7 +441,7 @@ _no_delayslot:
         RESTORE_STATE;
         bri     unaligned_data_trap
 #endif
-        andi    r6, r3, 0x3E0; /* Mask and extract the register operand */
+        andi    r6, r4, 0x3E0; /* Mask and extract the register operand */
         srl     r6, r6; /* r6 >> 5 */
         srl     r6, r6;
         srl     r6, r6;
@@ -450,33 +450,33 @@ _no_delayslot:
         /* Store the register operand in a temporary location */
         sbi     r6, r0, TOPHYS(ex_reg_op);
 
-        andi    r6, r3, 0x400; /* Extract ESR[S] */
+        andi    r6, r4, 0x400; /* Extract ESR[S] */
         bnei    r6, ex_sw;
 ex_lw:
-        andi    r6, r3, 0x800; /* Extract ESR[W] */
+        andi    r6, r4, 0x800; /* Extract ESR[W] */
         beqi    r6, ex_lhw;
-        lbui    r5, r4, 0; /* Exception address in r4 */
+        lbui    r5, r3, 0; /* Exception address in r3 */
         /* Load a word, byte-by-byte from destination address
                 and save it in tmp space */
         sbi     r5, r0, TOPHYS(ex_tmp_data_loc_0);
-        lbui    r5, r4, 1;
+        lbui    r5, r3, 1;
         sbi     r5, r0, TOPHYS(ex_tmp_data_loc_1);
-        lbui    r5, r4, 2;
+        lbui    r5, r3, 2;
         sbi     r5, r0, TOPHYS(ex_tmp_data_loc_2);
-        lbui    r5, r4, 3;
+        lbui    r5, r3, 3;
         sbi     r5, r0, TOPHYS(ex_tmp_data_loc_3);
-        /* Get the destination register value into r3 */
-        lwi     r3, r0, TOPHYS(ex_tmp_data_loc_0);
+        /* Get the destination register value into r4 */
+        lwi     r4, r0, TOPHYS(ex_tmp_data_loc_0);
         bri     ex_lw_tail;
 ex_lhw:
-        lbui    r5, r4, 0; /* Exception address in r4 */
+        lbui    r5, r3, 0; /* Exception address in r3 */
         /* Load a half-word, byte-by-byte from destination
                 address and save it in tmp space */
         sbi     r5, r0, TOPHYS(ex_tmp_data_loc_0);
-        lbui    r5, r4, 1;
+        lbui    r5, r3, 1;
         sbi     r5, r0, TOPHYS(ex_tmp_data_loc_1);
-        /* Get the destination register value into r3 */
-        lhui    r3, r0, TOPHYS(ex_tmp_data_loc_0);
+        /* Get the destination register value into r4 */
+        lhui    r4, r0, TOPHYS(ex_tmp_data_loc_0);
 ex_lw_tail:
         /* Get the destination register number into r5 */
         lbui    r5, r0, TOPHYS(ex_reg_op);
@@ -504,25 +504,25 @@ ex_sw_tail:
         andi    r6, r6, 0x800; /* Extract ESR[W] */
         beqi    r6, ex_shw;
         /* Get the word - delay slot */
-        swi     r3, r0, TOPHYS(ex_tmp_data_loc_0);
+        swi     r4, r0, TOPHYS(ex_tmp_data_loc_0);
         /* Store the word, byte-by-byte into destination address */
-        lbui    r3, r0, TOPHYS(ex_tmp_data_loc_0);
-        sbi     r3, r4, 0;
-        lbui    r3, r0, TOPHYS(ex_tmp_data_loc_1);
-        sbi     r3, r4, 1;
-        lbui    r3, r0, TOPHYS(ex_tmp_data_loc_2);
-        sbi     r3, r4, 2;
-        lbui    r3, r0, TOPHYS(ex_tmp_data_loc_3);
-        sbi     r3, r4, 3;
+        lbui    r4, r0, TOPHYS(ex_tmp_data_loc_0);
+        sbi     r4, r3, 0;
+        lbui    r4, r0, TOPHYS(ex_tmp_data_loc_1);
+        sbi     r4, r3, 1;
+        lbui    r4, r0, TOPHYS(ex_tmp_data_loc_2);
+        sbi     r4, r3, 2;
+        lbui    r4, r0, TOPHYS(ex_tmp_data_loc_3);
+        sbi     r4, r3, 3;
         bri     ex_handler_done;
 
 ex_shw:
         /* Store the lower half-word, byte-by-byte into destination address */
-        swi     r3, r0, TOPHYS(ex_tmp_data_loc_0);
-        lbui    r3, r0, TOPHYS(ex_tmp_data_loc_2);
-        sbi     r3, r4, 0;
-        lbui    r3, r0, TOPHYS(ex_tmp_data_loc_3);
-        sbi     r3, r4, 1;
+        swi     r4, r0, TOPHYS(ex_tmp_data_loc_0);
+        lbui    r4, r0, TOPHYS(ex_tmp_data_loc_2);
+        sbi     r4, r3, 0;
+        lbui    r4, r0, TOPHYS(ex_tmp_data_loc_3);
+        sbi     r4, r3, 1;
 ex_sw_end: /* Exception handling of store word, ends. */
 
 ex_handler_done: