Add rudimentary python qemu interface

diff --git a/src/soc/simulator/qemu.py b/src/soc/simulator/qemu.py
new file mode 100644 (file)
index 0000000..70e29b0
--- /dev/null
+++ b/src/soc/simulator/qemu.py
@@ -0,0 +1,51 @@
+from pygdbmi.gdbcontroller import GdbController
+import subprocess
+
+launch_args = ['qemu-system-ppc64',
+               '-machine', 'powernv9',
+               '-nographic',
+               '-s', '-S']
+
+class QemuController:
+    def __init__(self, kernel):
+        args = launch_args + ['-kernel', kernel]
+        self.qemu_popen = subprocess.Popen(args,
+                                           stdout=subprocess.PIPE,
+                                           stdin=subprocess.PIPE)
+        self.gdb = GdbController(gdb_path='powerpc64-linux-gnu-gdb')
+
+    def connect(self):
+        return self.gdb.write('-target-select remote localhost:1234')
+
+    def break_address(self, addr):
+        cmd = '-break-insert *0x{:x}'.format(addr)
+        return self.gdb.write(cmd)
+
+    def get_registers(self):
+        return self.gdb.write('-data-list-register-values x')
+
+    def get_register(self, num):
+        return self.gdb.write('-data-list-register-values x {}'.format(num))
+
+    def step(self):
+        return self.gdb.write('-exec-next-instruction')
+
+    def gdb_continue(self):
+        return self.gdb.write('-exec-continue')
+        
+    def exit(self):
+        self.gdb.exit()
+        self.qemu_popen.kill()
+                                 
+
+if __name__ == '__main__':
+    q = QemuController("qemu_test/kernel.bin")
+    q.connect()
+    q.break_address(0x20000000)
+    q.gdb_continue()
+    print(q.get_register(1))
+    print(q.step())
+    print(q.get_register(1))
+    q.exit()
+
+