diff options
| author | Michal Simek <monstr@monstr.eu> | 2010-06-22 17:46:27 +0200 |
|---|---|---|
| committer | Michal Simek <monstr@monstr.eu> | 2010-08-04 10:29:44 +0200 |
| commit | b318067e2c946a560035faf47e24a20e50696cce (patch) | |
| tree | 7818d4285ef257f9b989bd032d3b59d9e0b5732c /arch/microblaze/kernel | |
| parent | 77f6d226050e2d8f046e268a9f84ec834172f0de (diff) | |
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/kernel')
| -rw-r--r-- | arch/microblaze/kernel/entry.S | 15 |
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): |