Closure hooks and on thread create hook (#542)

* Closure hooks and on thread create hook

* on thread once hook

* clippy

* fix

* fix

libafl_qemu/build_linux.rs

@@ -3,7 +3,7 @@ use which::which;
 
 const QEMU_URL: &str = "https://github.com/AFLplusplus/qemu-libafl-bridge";
 const QEMU_DIRNAME: &str = "qemu-libafl-bridge";
-const QEMU_REVISION: &str = "152fdbe024493f31e60060714caee3b90fdf3d9e";
+const QEMU_REVISION: &str = "35dcfc0c115da262622fdc811d089155f26a2abe";
 
 fn build_dep_check(tools: &[&str]) {
     for tool in tools {

libafl_qemu/src/emu.rs

@@ -240,6 +240,8 @@ extern "C" {
     static mut libafl_exec_cmp_hook8: unsafe extern "C" fn(u64, u64, u64);
     static mut libafl_gen_cmp_hook: unsafe extern "C" fn(u64, u32) -> u64;
 
+    static mut libafl_on_thread_hook: unsafe extern "C" fn(u32);
+
     static mut libafl_pre_syscall_hook:
         unsafe extern "C" fn(i32, u64, u64, u64, u64, u64, u64, u64, u64) -> SyscallHookResult;
     static mut libafl_post_syscall_hook:
@@ -662,6 +664,12 @@ impl Emulator {
         }
     }
 
+    pub fn set_on_thread_hook(&self, hook: extern "C" fn(tid: u32)) {
+        unsafe {
+            libafl_on_thread_hook = hook;
+        }
+    }
+
     pub fn set_pre_syscall_hook(
         &self,
         hook: extern "C" fn(i32, u64, u64, u64, u64, u64, u64, u64, u64) -> SyscallHookResult,