On Sat, Jun 19, 2021 at 4:49 AM Alessandro Di Federico via <qemu-devel@nongnu.org> wrote:

From: Niccolò Izzo <nizzo@rev.ng>

Signed-off-by: Alessandro Di Federico <ale@rev.ng>
Signed-off-by: Niccolò Izzo <nizzo@rev.ng>
---

 

+    .text
+    .globl _start
+
+_start:
+    {
+        call init
+    }
+    {
+        r0=#1
+        memw(sp+#0)=r0.new
+    }

You haven't set up the stack, so you shouldn't use sp.  Even if the stack were set up, you should allocframe first.