1 files changed, 49 insertions, 0 deletions
diff --git a/src/runtime/os_linux_arm.go b/src/runtime/os_linux_arm.go
new file mode 100644
index 0000000..b590da7
--- /dev/null
+++ b/src/runtime/os_linux_arm.go
@@ -0,0 +1,49 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package runtime
+
+import "internal/cpu"
+
+const (
+	_HWCAP_VFP   = 1 << 6  // introduced in at least 2.6.11
+	_HWCAP_VFPv3 = 1 << 13 // introduced in 2.6.30
+)
+
+func checkgoarm() {
+	// On Android, /proc/self/auxv might be unreadable and hwcap won't
+	// reflect the CPU capabilities. Assume that every Android arm device
+	// has the necessary floating point hardware available.
+	if GOOS == "android" {
+		return
+	}
+	if goarm > 5 && cpu.HWCap&_HWCAP_VFP == 0 {
+		print("runtime: this CPU has no floating point hardware, so it cannot run\n")
+		print("this GOARM=", goarm, " binary. Recompile using GOARM=5.\n")
+		exit(1)
+	}
+	if goarm > 6 && cpu.HWCap&_HWCAP_VFPv3 == 0 {
+		print("runtime: this CPU has no VFPv3 floating point hardware, so it cannot run\n")
+		print("this GOARM=", goarm, " binary. Recompile using GOARM=5 or GOARM=6.\n")
+		exit(1)
+	}
+}
+
+func archauxv(tag, val uintptr) {
+	switch tag {
+	case _AT_HWCAP:
+		cpu.HWCap = uint(val)
+	case _AT_HWCAP2:
+		cpu.HWCap2 = uint(val)
+	}
+}
+
+func osArchInit() {}
+
+//go:nosplit
+func cputicks() int64 {
+	// Currently cputicks() is used in blocking profiler and to seed fastrand().
+	// nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
+	return nanotime()
+}