libafl_qemu: add memory access by physcial address

libafl_qemu/src/emu.rs

@@ -242,6 +242,7 @@ extern "C" {
         len: i32,
         is_write: i32,
     );
+    fn cpu_physical_memory_rw(addr: GuestAddr, buf: *mut u8, len: i32, iswrite: bool);
 
     static mut libafl_start_vcpu: extern "C" fn(cpu: CPUStatePtr);
 
@@ -669,6 +670,19 @@ impl Emulator {
             .read_mem(addr, buf);
     }
 
+    /// Write a value to a phsical guest address, including ROM areas.
+    #[cfg(emulation_mode = "systemmode")]
+    pub unsafe fn write_phys_mem(&self, addr: GuestAddr, buf: &[u8]) {
+        cpu_physical_memory_rw(addr, buf.as_ptr() as *mut u8, buf.len() as i32, true);
+    }
+
+    /// Read a value from a physical guest address.
+    #[cfg(emulation_mode = "systemmode")]
+    pub unsafe fn read_phys_mem(&self, addr: GuestAddr, buf: &mut [u8]) {
+        #[cfg(emulation_mode = "systemmode")]
+        cpu_physical_memory_rw(addr, buf.as_mut_ptr(), buf.len() as i32, false);
+    }
+
     #[must_use]
     pub fn num_regs(&self) -> i32 {
         self.current_cpu().unwrap().num_regs()