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authorgVisor bot <gvisor-bot@google.com>2019-09-19 12:03:38 -0700
committergVisor bot <gvisor-bot@google.com>2019-09-19 12:03:38 -0700
commit1c0324d5a19535cac7369abf2e32f6148fcdcd80 (patch)
tree791efaa6e0ea9d300f119034dc1591fa65f0ec74 /pkg
parent0a8a75f3dabaf5c097710c3bb961b67b8ed653b5 (diff)
parentcabe10e603f36d610b7d3858c0911fc2dde26411 (diff)
Merge pull request #876 from xiaobo55x:hostcpu
PiperOrigin-RevId: 270094324
Diffstat (limited to 'pkg')
-rw-r--r--pkg/sentry/hostcpu/BUILD1
-rw-r--r--pkg/sentry/hostcpu/getcpu_arm64.s28
2 files changed, 29 insertions, 0 deletions
diff --git a/pkg/sentry/hostcpu/BUILD b/pkg/sentry/hostcpu/BUILD
index d4a420e60..359468ccc 100644
--- a/pkg/sentry/hostcpu/BUILD
+++ b/pkg/sentry/hostcpu/BUILD
@@ -7,6 +7,7 @@ go_library(
name = "hostcpu",
srcs = [
"getcpu_amd64.s",
+ "getcpu_arm64.s",
"hostcpu.go",
],
importpath = "gvisor.dev/gvisor/pkg/sentry/hostcpu",
diff --git a/pkg/sentry/hostcpu/getcpu_arm64.s b/pkg/sentry/hostcpu/getcpu_arm64.s
new file mode 100644
index 000000000..caf9abb89
--- /dev/null
+++ b/pkg/sentry/hostcpu/getcpu_arm64.s
@@ -0,0 +1,28 @@
+// Copyright 2019 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.
+
+#include "textflag.h"
+
+// GetCPU makes the getcpu(unsigned *cpu, unsigned *node, NULL) syscall for
+// the lack of an optimazed way of getting the current CPU number on arm64.
+
+// func GetCPU() (cpu uint32)
+TEXT ·GetCPU(SB), NOSPLIT, $0-4
+ MOVW ZR, cpu+0(FP)
+ MOVD $cpu+0(FP), R0
+ MOVD $0x0, R1 // unused
+ MOVD $0x0, R2 // unused
+ MOVD $0xA8, R8 // SYS_GETCPU
+ SVC
+ RET