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Subject[PATCH v2] microblaze: nommu: Don't clobber R11 on syscalls
Date
The noMMU syscall trap has a bug that causes R11 to be zero on return to 
userland. Remove the extra "save" of R11 responsible for the bug, as well
as an unnecessary extra "load".

Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
---
diff -uprN a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S
--- a/arch/microblaze/kernel/entry-nommu.S 2009-12-09 17:05:11.000000000 -0600
+++ b/arch/microblaze/kernel/entry-nommu.S 2009-12-14 11:29:37.000000000 -0600
@@ -208,8 +208,6 @@ ENTRY(_user_exception)
lwi r1, r1, TS_THREAD_INFO /* get the thread info */
/* calculate kernel stack pointer */
addik r1, r1, THREAD_SIZE - PT_SIZE
- swi r11, r0, PER_CPU(R11_SAVE) /* temporarily save r11 */
- lwi r11, r0, PER_CPU(KM) /* load mode indicator */
2:
swi r11, r1, PT_MODE /* store the mode */
lwi r11, r0, PER_CPU(R11_SAVE) /* reload r11 */


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