parisc: make interrupt and interruption stack allocation reentrant

The get_stack_use_cr30 and get_stack_use_r30 macros allocate a stack
frame for external interrupts and interruptions requiring a stack frame.
They are currently not reentrant in that they save register context
before the stack is set or adjusted.

I have observed a number of system crashes where there was clear
evidence of stack corruption during interrupt processing, and as a
result register corruption. Some interruptions can still occur during
interruption processing, however external interrupts are disabled and
data TLB misses don't occur for absolute accesses. So, it's not entirely
clear what triggers this issue. Also, if an interruption occurs when
Q=0, it is generally not possible to recover as the shadowed registers
are not copied.

The attached patch reworks the get_stack_use_cr30 and get_stack_use_r30
macros to allocate stack before doing register saves. The new code is a
couple of instructions shorter than the old implementation. Thus, it's
an improvement even if it doesn't fully resolve the stack corruption
issue. Based on limited testing, it improves SMP system stability.

Signed-off-by: John David Anglin <dave.anglin@bell.net>
Signed-off-by: Helge Deller <deller@gmx.de>

2 files changed, 10 insertions, 10 deletions

diff --git a/arch/parisc/include/asm/assembly.h b/arch/parisc/include/asm/assembly.h
index 89fb40005e3f..0da848232344 100644
--- a/arch/parisc/include/asm/assembly.h
+++ b/arch/parisc/include/asm/assembly.h
@@ -438,7 +438,6 @@
         SAVE_SP  (%sr4, PT_SR4 (\regs))
         SAVE_SP  (%sr5, PT_SR5 (\regs))
         SAVE_SP  (%sr6, PT_SR6 (\regs))
-        SAVE_SP  (%sr7, PT_SR7 (\regs))
 
         SAVE_CR  (%cr17, PT_IASQ0(\regs))
         mtctl    %r0,   %cr17
diff --git a/arch/parisc/kernel/entry.S b/arch/parisc/kernel/entry.S
index ae27cb6ce19a..e8f07dd28401 100644
--- a/arch/parisc/kernel/entry.S
+++ b/arch/parisc/kernel/entry.S
@@ -65,15 +65,11 @@
         rsm     PSW_SM_I, %r0   /* barrier for "Relied upon Translation */
         mtsp    %r0, %sr4
         mtsp    %r0, %sr5
-        mfsp    %sr7, %r1
-        or,=    %r0,%r1,%r0     /* Only save sr7 in sr3 if sr7 != 0 */
-        mtsp    %r1, %sr3
+        mtsp    %r0, %sr6
         tovirt_r1 %r29
         load32  KERNEL_PSW, %r1
 
         rsm     PSW_SM_QUIET,%r0        /* second "heavy weight" ctl op */
-        mtsp    %r0, %sr6
-        mtsp    %r0, %sr7
         mtctl   %r0, %cr17      /* Clear IIASQ tail */
         mtctl   %r0, %cr17      /* Clear IIASQ head */
         mtctl   %r1, %ipsw
@@ -119,17 +115,20 @@
 
         /* we save the registers in the task struct */
 
+        copy    %r30, %r17
         mfctl   %cr30, %r1
+        ldo     THREAD_SZ_ALGN(%r1), %r30
+        mtsp    %r0,%sr7
+        mtsp    %r16,%sr3
         tophys  %r1,%r9
         LDREG   TI_TASK(%r9), %r1       /* thread_info -> task_struct */
         tophys  %r1,%r9
         ldo     TASK_REGS(%r9),%r9
-        STREG   %r30, PT_GR30(%r9)
+        STREG   %r17,PT_GR30(%r9)
         STREG   %r29,PT_GR29(%r9)
         STREG   %r26,PT_GR26(%r9)
+        STREG   %r16,PT_SR7(%r9)
         copy    %r9,%r29
-        mfctl   %cr30, %r1
-        ldo     THREAD_SZ_ALGN(%r1), %r30
         .endm
 
         .macro  get_stack_use_r30
@@ -137,10 +136,12 @@
         /* we put a struct pt_regs on the stack and save the registers there */
 
         tophys  %r30,%r9
-        STREG   %r30,PT_GR30(%r9)
+        copy    %r30,%r1
         ldo     PT_SZ_ALGN(%r30),%r30
+        STREG   %r1,PT_GR30(%r9)
         STREG   %r29,PT_GR29(%r9)
         STREG   %r26,PT_GR26(%r9)
+        STREG   %r16,PT_SR7(%r9)
         copy    %r9,%r29
         .endm