enable pkg/sentry/arch to support arm64 basically

Signed-off-by: Bin Lu <bin.lu@arm.com>
Change-Id: I9cce23db4e5caec82ce42b4970fdb7f7e8c08f1d
COPYBARA_INTEGRATE_REVIEW=https://github.com/google/gvisor/pull/773 from lubinszARM:pr_arch_basic 3fe2fd8e6286766bbe489ef971dce204f924feba
PiperOrigin-RevId: 289795569

1 files changed, 38 insertions, 0 deletions

diff --git a/pkg/sentry/arch/arch_state_aarch64.go b/pkg/sentry/arch/arch_state_aarch64.go
new file mode 100644
index 000000000..0136a85ad
--- /dev/null
+++ b/pkg/sentry/arch/arch_state_aarch64.go
@@ -0,0 +1,38 @@
+// Copyright 2020 The gVisor Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build arm64
+
+package arch
+
+import (
+	"syscall"
+)
+
+type syscallPtraceRegs struct {
+	Regs   [31]uint64
+	Sp     uint64
+	Pc     uint64
+	Pstate uint64
+}
+
+// saveRegs is invoked by stateify.
+func (s *State) saveRegs() syscallPtraceRegs {
+	return syscallPtraceRegs(s.Regs)
+}
+
+// loadRegs is invoked by stateify.
+func (s *State) loadRegs(r syscallPtraceRegs) {
+	s.Regs = syscall.PtraceRegs(r)
+}