arm64: show unhandled SP/PC alignment faults

Report unhandled SP/PC alignment faults if the show_unhandled_signals
variable is set (via /proc/sys/debug/exception-trace).

Signed-off-by: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index 96da13167d4a..e8c608c893cf 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -478,12 +478,19 @@ asmlinkage void __exception do_sp_pc_abort(unsigned long addr,
                                            struct pt_regs *regs)
 {
         struct siginfo info;
+        struct task_struct *tsk = current;
+
+        if (show_unhandled_signals && unhandled_signal(tsk, SIGBUS))
+                pr_info_ratelimited("%s[%d]: %s exception: pc=%p sp=%p\n",
+                                    tsk->comm, task_pid_nr(tsk),
+                                    esr_get_class_string(esr), (void *)regs->pc,
+                                    (void *)regs->sp);
 
         info.si_signo = SIGBUS;
         info.si_errno = 0;
         info.si_code  = BUS_ADRALN;
         info.si_addr  = (void __user *)addr;
-        arm64_notify_die("", regs, &info, esr);
+        arm64_notify_die("Oops - SP/PC alignment exception", regs, &info, esr);
 }
 
 static struct fault_info debug_fault_info[] = {