parisc: Clear stale IIR value on instruction access rights trap

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 b11fb26ce2998d7b8884c75ff05129c1f48c1db2..892b7fc8f3c45880de741d552d20c187ad0231c8 100644 (file)
--- 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 stale IIR value. */
+               regs->iir = 0xbaadf00d;
                fallthrough;
        case 27: 
                /* Data memory protection ID trap */