diff options
| author | Russ Anderson <rja@sgi.com> | 2005-04-06 00:07:00 -0700 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2005-05-03 13:47:42 -0700 |
| commit | b1b901c2029aa0fd8aa4ac5f04f31648ae2358b4 (patch) | |
| tree | 43f5dde2309d66fa2112a7c2dc46ea7c63fae459 /arch/ia64/kernel/mca_drv_asm.S | |
| parent | 446b8831f5acf2076fa58a66286789eb84f3df2c (diff) | |
[IA64] MCA recovery improvements
Jack Steiner uncovered some opportunities for improvement in
the MCA recovery code.
1) Set bsp to save registers on the kernel stack.
2) Disable interrupts while in the MCA recovery code.
3) Change the way the user process is killed, to avoid
a panic in schedule.
Testing shows that these changes make the recovery code much
more reliable with the 2.6.12 kernel.
Signed-off-by: Russ Anderson <rja@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/mca_drv_asm.S')
| -rw-r--r-- | arch/ia64/kernel/mca_drv_asm.S | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/arch/ia64/kernel/mca_drv_asm.S b/arch/ia64/kernel/mca_drv_asm.S index bcfa05acc561..2d7e0217638d 100644 --- a/arch/ia64/kernel/mca_drv_asm.S +++ b/arch/ia64/kernel/mca_drv_asm.S @@ -10,6 +10,7 @@ #include <asm/asmmacro.h> #include <asm/processor.h> +#include <asm/ptrace.h> GLOBAL_ENTRY(mca_handler_bhhook) invala // clear RSE ? @@ -20,12 +21,21 @@ GLOBAL_ENTRY(mca_handler_bhhook) ;; alloc r16=ar.pfs,0,2,1,0 // make a new frame ;; + mov ar.rsc=0 + ;; mov r13=IA64_KR(CURRENT) // current task pointer ;; - adds r12=IA64_TASK_THREAD_KSP_OFFSET,r13 + mov r2=r13 + ;; + addl r22=IA64_RBS_OFFSET,r2 + ;; + mov ar.bspstore=r22 ;; - ld8 r12=[r12] // stack pointer + addl sp=IA64_STK_OFFSET-IA64_PT_REGS_SIZE,r2 ;; + adds r2=IA64_TASK_THREAD_ON_USTACK_OFFSET,r13 + ;; + st1 [r2]=r0 // clear current->thread.on_ustack flag mov loc0=r16 movl loc1=mca_handler_bh // recovery C function ;; @@ -34,7 +44,9 @@ GLOBAL_ENTRY(mca_handler_bhhook) ;; mov loc1=rp ;; - br.call.sptk.many rp=b6 // not return ... + ssm psr.i + ;; + br.call.sptk.many rp=b6 // does not return ... ;; mov ar.pfs=loc0 mov rp=loc1 |