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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>
hifive-unleashed-5.1
Michal Simek 2010-06-22 15:25:24 +02:00
parent 8b110d157c
commit 06b2864038
1 changed files with 2 additions and 5 deletions
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7
arch/microblaze/kernel/entry.S
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@ -895,15 +895,12 @@ C_ENTRY(_debug_exception):
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;