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authorAndrei Vagin <avagin@google.com>2019-10-02 13:00:07 -0700
committerGitHub <noreply@github.com>2019-10-02 13:00:07 -0700
commit9a875306dbabcf335a2abccc08119a1b67d0e51a (patch)
tree0f72c12e951a5eee7156df7a5d63351bc89befa6 /pkg/sentry/hostcpu/getcpu_arm64.s
parent38bc0b6b6addd25ceec4f66ef1af41c1e61e2985 (diff)
parent03ce4dd86c9acd6b6148f68d5d2cf025d8c254bb (diff)
Merge branch 'master' into pr_syscall_linux
Diffstat (limited to 'pkg/sentry/hostcpu/getcpu_arm64.s')
-rw-r--r--pkg/sentry/hostcpu/getcpu_arm64.s28
1 files changed, 28 insertions, 0 deletions
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