From deb5286724d1b1421d8b354c6f0d4d23b4ba638a Mon Sep 17 00:00:00 2001
From: Alwin Berger <alwin.berger@tu-dortmund.de>
Date: Mon, 13 Mar 2023 14:46:09 +0100
Subject: [PATCH] re-introduce native breakpoints

---
 include/libafl/exit.h |  5 +++++
 libafl/exit.c         | 18 ++++++++++++++++++
 system/cpus.c         |  5 ++++-
 3 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/include/libafl/exit.h b/include/libafl/exit.h
index a302aa53c1..932a0f9659 100644
--- a/include/libafl/exit.h
+++ b/include/libafl/exit.h
@@ -62,3 +62,8 @@ void libafl_exit_request_internal(CPUState* cpu, uint64_t pc, ShutdownCause caus
 void libafl_exit_request_sync_backdoor(CPUState* cpu, target_ulong pc);
 void libafl_exit_request_breakpoint(CPUState* cpu, target_ulong pc);
 struct libafl_exit_reason* libafl_get_exit_reason(void);
+
+#ifndef CONFIG_USER_ONLY
+void libafl_qemu_set_native_breakpoint(vaddr pc);
+void libafl_qemu_remove_native_breakpoint(vaddr pc);
+#endif
diff --git a/libafl/exit.c b/libafl/exit.c
index df0ab04a09..f8a50f6d74 100644
--- a/libafl/exit.c
+++ b/libafl/exit.c
@@ -143,3 +143,21 @@ struct libafl_exit_reason* libafl_get_exit_reason(void)
 
     return NULL;
 }
+
+#ifndef CONFIG_USER_ONLY
+void libafl_qemu_set_native_breakpoint(vaddr pc)
+{
+    CPUState *cpu;
+    CPU_FOREACH(cpu) {
+        cpu_breakpoint_insert(cpu, pc, BP_GDB, NULL);
+    }
+}
+
+void libafl_qemu_remove_native_breakpoint(vaddr pc)
+{
+    CPUState *cpu;
+    CPU_FOREACH(cpu) {
+        cpu_breakpoint_remove(cpu, pc, BP_GDB);
+    }
+}
+#endif
\ No newline at end of file
diff --git a/system/cpus.c b/system/cpus.c
index de8fb01b5a..e51bdff2f8 100644
--- a/system/cpus.c
+++ b/system/cpus.c
@@ -333,7 +333,10 @@ void cpu_handle_guest_debug(CPUState *cpu)
             cpu_single_step(cpu, 0);
         }
     } else {
-        gdb_set_stop_cpu(cpu);
+        /* Begin LibAFL changes */
+        // With LibAFL Breakpoints there is no gdb attached.
+        // gdb_set_stop_cpu(cpu);
+        /* End LibAFL changes */
         qemu_system_debug_request();
         cpu->stopped = true;
     }