tests: fix arm regression due to kernel not found

At Ia49298304f658701ea0800bd79e08db404a655c3 we removed the default
kernel and DTB filenames from FSConfig.py.

However, the regression tests rely on that to find those blobs.

This commit restores those default filenames just for the config of the
regression tests.

Change-Id: I9d7d869b0087ee8a3b63088693f753a703ead5d6
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-on: https://gem5-review.googlesource.com/c/15957
Maintainer: Andreas Sandberg <andreas.sandberg@arm.com>

tests/configs/arm_generic.py

@@ -1,4 +1,4 @@
-# Copyright (c) 2012, 2017 ARM Limited
+# Copyright (c) 2012, 2017, 2019 ARM Limited
 # All rights reserved.
 #
 # The license below extends only to copyright in the software and shall
@@ -46,6 +46,8 @@ from base_config import *
 from common.cores.arm.O3_ARM_v7a import *
 from common.Benchmarks import SysConfig
 
+from common import SysPaths
+
 class ArmSESystemUniprocessor(BaseSESystemUniprocessor):
     """Syscall-emulation builder for ARM uniprocessor systems.
 
@@ -95,6 +97,20 @@ class LinuxArmSystemBuilder(object):
         system.panic_on_panic = True
         system.panic_on_oops = True
 
+        default_kernels = {
+            "RealViewPBX": "vmlinux.arm.smp.fb.2.6.38.8",
+            "VExpress_EMM": "vmlinux.aarch32.ll_20131205.0-gem5",
+            "VExpress_EMM64": "vmlinux.aarch64.20140821",
+        }
+        system.kernel = SysPaths.binary(default_kernels[self.machine_type])
+        default_dtbs = {
+           "RealViewPBX": None,
+           "VExpress_EMM": "vexpress.aarch32.ll_20131205.0-gem5.{}cpu.dtb" \
+             .format(self.num_cpus),
+           "VExpress_EMM64": "vexpress.aarch64.20140821.dtb",
+        }
+        system.dtb_filename = SysPaths.binary(default_dtbs[self.machine_type])
+
         self.init_system(system)
         return system