From a60e9c8bfa9def4f5d7ad166561995ac51dd949e Mon Sep 17 00:00:00 2001
From: carlos <102978772+carlosqwqqwq@users.noreply.github.com>
Date: Fri, 14 Aug 2026 11:19:07 +0800
Subject: [PATCH 1/4] fix(riscv): make sip.SSIP software-writable regardless of
 mideleg

---
 src/isa/riscv/cpu/csr_ops.rs | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/src/isa/riscv/cpu/csr_ops.rs b/src/isa/riscv/cpu/csr_ops.rs
index f6b929e0f..75488c5df 100644
--- a/src/isa/riscv/cpu/csr_ops.rs
+++ b/src/isa/riscv/cpu/csr_ops.rs
@@ -137,7 +137,9 @@ impl RiscVCpu {
             Csr::Mtval => self.mtval = value,
             Csr::Mip => self.mip = value,
             Csr::Sip => {
-                let mask = self.supervisor_software_interrupt_mask();
+                // norm:sip: SSIP (bit 1) is writable by software regardless
+                // of mideleg; mideleg only controls interrupt delegation.
+                let mask = (1 << 1) & self.xmask();
                 self.mip = (self.mip & !mask) | (value & mask);
             }
             Csr::Vstart => self.vstart = value,
@@ -295,6 +297,25 @@ mod tests {
         }
     }
 
+    #[test]
+    fn sip_ssip_writable_without_mideleg() {
+        let mut cpu = cpu(Isa::rv_i());
+        // mideleg=0: SSIP is still software-writable through sip.
+        cpu.csr_write(0x303, 0).unwrap();
+        cpu.csr_write(0x144, 1 << 1).unwrap();
+        assert_eq!(
+            cpu.csr_read(0x344).unwrap() & (1 << 1),
+            1 << 1,
+            "sip SSIP write must set mip.SSIP even when mideleg=0"
+        );
+        // Clearing through sip also works.
+        cpu.csr_write(0x144, 0).unwrap();
+        assert_eq!(cpu.csr_read(0x344).unwrap() & (1 << 1), 0);
+        // Non-SSIP bits of sip are not stored.
+        cpu.csr_write(0x144, 1 << 5).unwrap();
+        assert_eq!(cpu.csr_read(0x344).unwrap() & (1 << 5), 0);
+    }
+
     #[test]
     fn csr_availability_tracks_xlen_and_declaring_extensions() {
         let mut unavailable = cpu(Isa::rv_i());

From 2469789783f944dd4ee32c814d6ea383bb94eba3 Mon Sep 17 00:00:00 2001
From: carlos <102978772+carlosqwqqwq@users.noreply.github.com>
Date: Fri, 14 Aug 2026 11:33:55 +0800
Subject: [PATCH 2/4] ci: retrigger linux-x64 test run


From 245100a270dd6558f56eabefe828f13763bafd0b Mon Sep 17 00:00:00 2001
From: carlos <102978772+carlosqwqqwq@users.noreply.github.com>
Date: Fri, 14 Aug 2026 12:16:14 +0800
Subject: [PATCH 3/4] ci: retrigger linux-x64 test run


From 5a16a1fa31c067c007ceb5b5ae2e3665aa121c22 Mon Sep 17 00:00:00 2001
From: carlos <102978772+carlosqwqqwq@users.noreply.github.com>
Date: Fri, 14 Aug 2026 12:58:08 +0800
Subject: [PATCH 4/4] ci: retrigger linux-x64 test run