Messages in this thread Patch in this message | | | From | steve@digidesc ... | Subject | [PATCH v2] microblaze: nommu: Don't clobber R11 on syscalls | Date | Mon, 14 Dec 2009 16:24:18 -0600 |
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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, 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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