From e94752f4ee088b0905e6c4e1405cbb5da9aef368 Mon Sep 17 00:00:00 2001
From: "Wesley W. Terpstra" <wesley@sifive.com>
Date: Mon, 22 Jan 2018 20:32:23 -0800
Subject: [PATCH] mtrap: loop forever, really

gcc sometimes takes liberties with optimizing away our important halt function!
---
 machine/mtrap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/machine/mtrap.c b/machine/mtrap.c
index 6c0e99cb..778990f3 100644
--- a/machine/mtrap.c
+++ b/machine/mtrap.c
@@ -38,7 +38,7 @@ void poweroff(uint16_t code)
   if (htif) {
     htif_poweroff();
   } else {
-    while (1);
+    while (1) { asm volatile ("#noop\n"); }
   }
 }