From: steve@digidescorp.com Date: Wed, 9 Dec 2009 23:13:42 +0000 (-0600) Subject: microblaze: nommu: Don't clobber R11 on syscalls X-Git-Tag: v2.6.33-rc1~283^2~1 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=825c9a359ecd6ba2569e6c38199e7d072ab388e3;p=profile%2Fivi%2Fkernel-x86-ivi.git microblaze: nommu: Don't clobber R11 on syscalls 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 Signed-off-by: Michal Simek --- diff --git a/arch/microblaze/kernel/entry-nommu.S b/arch/microblaze/kernel/entry-nommu.S index 9083d85..95b0855 100644 --- a/arch/microblaze/kernel/entry-nommu.S +++ b/arch/microblaze/kernel/entry-nommu.S @@ -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 */