From 9c61d29846d8521d9487a57739330f9682d5b542 Mon Sep 17 00:00:00 2001
From: Andrew Waterman <andrew@sifive.com>
Date: Thu, 18 Sep 2025 17:06:08 -0700
Subject: [PATCH] Misaligned fetch exception is not mandatorily delegable

Harts with IALIGN=16 might hardwire this medeleg bit to 0.
---
 machine/minit.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/machine/minit.c b/machine/minit.c
index 72f47ef..2256863 100644
--- a/machine/minit.c
+++ b/machine/minit.c
@@ -74,7 +74,6 @@ static void delegate_traps()
 
   uintptr_t interrupts = MIP_SSIP | MIP_STIP | MIP_SEIP;
   uintptr_t mandatorily_delegable_exceptions =
-    (1U << CAUSE_MISALIGNED_FETCH) |
     (1U << CAUSE_FETCH_PAGE_FAULT) |
     (1U << CAUSE_BREAKPOINT) |
     (1U << CAUSE_LOAD_PAGE_FAULT) |
@@ -82,6 +81,7 @@ static void delegate_traps()
     (1U << CAUSE_USER_ECALL);
   uintptr_t exceptions =
     mandatorily_delegable_exceptions |
+    (1U << CAUSE_MISALIGNED_FETCH) |
     (1U << CAUSE_SOFTWARE_CHECK_FAULT);
 
   write_csr(mideleg, interrupts);