From a5a49c3292a518fa33644c97a31e0150ededa1fc Mon Sep 17 00:00:00 2001
From: Alwin Berger <alwin.berger@tu-dortmund.de>
Date: Tue, 26 Apr 2022 00:29:18 +0200
Subject: [PATCH] add hard-coded libafl_exec_systick_hook

---
 hw/timer/armv7m_systick.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/hw/timer/armv7m_systick.c b/hw/timer/armv7m_systick.c
index 2f192011eb..04db11db00 100644
--- a/hw/timer/armv7m_systick.c
+++ b/hw/timer/armv7m_systick.c
@@ -39,8 +39,30 @@ static inline int64_t systick_scale(SysTickState *s)
     }
 }
 
+/* Begin LibAFL instrumentation */
+extern void libafl_send_irq(int irqn);
+extern int64_t libafl_get_clock( void );
+volatile unsigned int libafl_int_offset = 0;
+volatile bool libafl_int_done = false;
+/* This can be moved to a helper function later */
+inline void libafl_exec_systick_hook(void);
+inline void libafl_exec_systick_hook(void)
+{
+    if (libafl_int_offset!=0 && libafl_int_offset) {
+        if (libafl_get_clock() >= libafl_int_offset) {
+            if (!libafl_int_done) {
+                libafl_int_done = true;
+                libafl_send_irq(0);
+            }
+        } else {
+            libafl_int_done = false;
+        }
+    }
+}
 static void systick_timer_tick(void *opaque)
 {
+    libafl_exec_systick_hook();
+/* End LibAFL instrumentation */
     SysTickState *s = (SysTickState *)opaque;
 
     trace_systick_timer_tick();