target-arm: A64: Print ELR when taking exceptions

When taking an exception print the content of the exception link
register. This is useful especially for synchronous exceptions because
in that case this registers holds the address of the instruction that
generated the exception.

Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
Message-id: 1435036655-16132-1-git-send-email-soren.brinkmann@xilinx.com
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

target-arm/helper-a64.c

@@ -533,6 +533,8 @@ void aarch64_cpu_do_interrupt(CPUState *cs)
 
         env->condexec_bits = 0;
     }
+    qemu_log_mask(CPU_LOG_INT, "...with ELR 0x%" PRIx64 "\n",
+                  env->elr_el[new_el]);
 
     pstate_write(env, PSTATE_DAIF | new_mode);
     env->aarch64 = 1;