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>
diff --git a/arch/microblaze/kernel/hw_exception_handler.S b/arch/microblaze/kernel/hw_exception_handler.S
index ad6dbf0..a652add 100644
--- a/arch/microblaze/kernel/hw_exception_handler.S
+++ b/arch/microblaze/kernel/hw_exception_handler.S
@@ -313,13 +313,13 @@
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 @@
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 @@
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_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 @@
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 @@
/* 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 @@
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: