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authorMichal Simek <monstr@monstr.eu>2010-06-22 19:46:27 +0400
committerMichal Simek <monstr@monstr.eu>2010-08-04 12:29:44 +0400
commitb318067e2c946a560035faf47e24a20e50696cce (patch)
tree7818d4285ef257f9b989bd032d3b59d9e0b5732c /arch/microblaze
parent77f6d226050e2d8f046e268a9f84ec834172f0de (diff)
downloadlinux-b318067e2c946a560035faf47e24a20e50696cce.tar.xz
microblaze: Implement clear_ums macro and fix SAVE_STATE macro
VMS is always setup because VM mode was before exception/syscall/interrupt. Kernel continues in kernel mode that's why we have to clear UMS bit if kernel comes from user space. Signed-off-by: Michal Simek <monstr@monstr.eu>
Diffstat (limited to 'arch/microblaze')
-rw-r--r--arch/microblaze/kernel/entry.S15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/microblaze/kernel/entry.S b/arch/microblaze/kernel/entry.S
index 5318ad375fec..5529f64e97e8 100644
--- a/arch/microblaze/kernel/entry.S
+++ b/arch/microblaze/kernel/entry.S
@@ -91,6 +91,11 @@
nop
.endm
+ .macro clear_ums
+ msrclr r11, MSR_UMS
+ nop
+ .endm
+
.macro clear_vms_ums
msrclr r11, MSR_VMS | MSR_UMS
nop
@@ -162,6 +167,14 @@
nop
.endm
+ .macro clear_ums
+ mfs r11, rmsr
+ nop
+ andni r11, r11, MSR_UMS
+ mts rmsr,r11
+ nop
+ .endm
+
.macro clear_vms_ums
mfs r11, rmsr
nop
@@ -526,6 +539,8 @@ C_ENTRY(sys_rt_sigreturn_wrapper):
swi r0, r1, PTO + PT_MODE; /* Was in user-mode. */ \
lwi r11, r0, TOPHYS(PER_CPU(ENTRY_SP)); \
swi r11, r1, PTO+PT_R1; /* Store user SP. */ \
+ /* MS: I am clearing UMS even in case when I come from kernel space */ \
+ clear_ums; \
2: lwi CURRENT_TASK, r0, TOPHYS(PER_CPU(CURRENT_SAVE));
C_ENTRY(full_exception_trap):