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microblaze: nommu: Don't clobber R11 on syscalls

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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.

Remove reloading of mode indicator because r11 already contains it.

Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
Signed-off-by: Michal Simek <monstr@monstr.eu>
This commit is contained in:
steve@digidescorp.com 2009-12-09 17:13:42 -06:00 committed by Michal Simek
parent 233eb92115
commit 825c9a359e
1 changed files with 0 additions and 2 deletions
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2
arch/microblaze/kernel/entry-nommu.S
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@ -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 */