microblaze: Simplify _debug_exception function
Keep together all arguments for send_sig function.
Move returning address to delay slot which is executed.
Remove additional send_sig loading. I am using IMM part of
rtbd instruction with r0.
old solution:
addik r11, r0, send_sig
rtbd r11, 0
nop
new solution:
rtbd r0, send_sig
nop
There is one instruction saving.
Signed-off-by: Michal Simek <monstr@monstr.eu>
diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
index 0426571..04267ca 100644
--- a/arch/microblaze/kernel/entry.S
+++ b/arch/microblaze/kernel/entry.S
@@ -895,15 +895,12 @@
swi r0, r1, PTO+PT_R0;
tovirt(r1,r1)
+ set_vms;
addi r5, r0, SIGTRAP /* send the trap signal */
add r6, r0, CURRENT_TASK; /* Get current task ptr into r11 */
addk r7, r0, r0 /* 3rd param zero */
-
- set_vms;
- addik r11, r0, send_sig;
+dbtrap_call: rtbd r0, send_sig;
addik r15, r0, dbtrap_call;
-dbtrap_call: rtbd r11, 0;
- nop;
set_bip; /* Ints masked for state restore*/
lwi r11, r1, PTO+PT_MODE;