[PATCH] parisc: Clear stale IIR values on instruction access rights trap

[Helge Deller <deller@gmx.de>]

When a trap 7 (Instruction access rights) occurs, this means the CPU
couldn't execute an instruction due to missing execute permissions on
the memory region.  In this case it seems the CPU didn't even fetched
the instruction from memory and thus did not store it in the cr19 (IIR)
register before calling the trap handler. So, the trap handler will find
some random old stale value in cr19.

This patch simply overwrites the stale IIR value with a constant magic
"bad food" value (0xbaadf00d), in the hope people don't start to try to
understand the various random IIR values in trap 7 dumps.

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

---

diff --git a/arch/parisc/kernel/traps.c b/arch/parisc/kernel/traps.c
index b11fb26ce299..1e6dc2e34c16 100644
--- a/arch/parisc/kernel/traps.c
+++ b/arch/parisc/kernel/traps.c
@@ -730,6 +730,8 @@ void notrace handle_interruption(int code, struct pt_regs *regs)
 			}
 			mmap_read_unlock(current->mm);
 		}
+		/* CPU could not fetch instruction, so clear IIR stale value. */
+		regs->iir = 0xbaadf00d;
 		fallthrough;
 	case 27:
 		/* Data memory protection ID trap */