[PARISC] Add ability for prctl to change unaligned trap behaviour

Add support for changing unaligned trap behaviour on a
per-thread basis.

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>

1 files changed, 10 insertions, 6 deletions

diff --git a/arch/parisc/kernel/unaligned.c b/arch/parisc/kernel/unaligned.c
index 62eea35bcd69..eaae8a021f9f 100644
--- a/arch/parisc/kernel/unaligned.c
+++ b/arch/parisc/kernel/unaligned.c
@@ -513,15 +513,18 @@ void handle_unaligned(struct pt_regs *regs)
         register int flop=0;    /* true if this is a flop */
 
         /* log a message with pacing */
-        if (user_mode(regs))
-        {
-                if (unaligned_count > 5 && jiffies - last_time > 5*HZ)
-                {
+        if (user_mode(regs)) {
+                if (current->thread.flags & PARISC_UAC_SIGBUS) {
+                        goto force_sigbus;
+                }
+
+                if (unaligned_count > 5 && jiffies - last_time > 5*HZ) {
                         unaligned_count = 0;
                         last_time = jiffies;
                 }
-                if (++unaligned_count < 5)
-                {
+
+                if (!(current->thread.flags & PARISC_UAC_NOPRINT) 
+                    && ++unaligned_count < 5) {
                         char buf[256];
                         sprintf(buf, "%s(%d): unaligned access to 0x" RFMT " at ip=0x" RFMT "\n",
                                 current->comm, current->pid, regs->ior, regs->iaoq[0]);
@@ -530,6 +533,7 @@ void handle_unaligned(struct pt_regs *regs)
                         show_regs(regs);
 #endif          
                 }
+
                 if (!unaligned_enabled)
                         goto force_sigbus;
         }