mirror of https://go.googlesource.com/go
55 lines
1.4 KiB
Go
55 lines
1.4 KiB
Go
// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package runtime
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import (
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"internal/cpu"
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"unsafe"
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)
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const (
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_HWCAP_VFP = 1 << 6
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_HWCAP_VFPv3 = 1 << 13
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)
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func checkgoarm() {
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if cpu.HWCap&_HWCAP_VFP == 0 && goarmsoftfp == 0 {
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print("runtime: this CPU has no floating point hardware, so it cannot run\n")
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print("a binary compiled for hard floating point. Recompile adding ,softfloat\n")
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print("to GOARM.\n")
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exit(1)
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}
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if goarm > 6 && cpu.HWCap&_HWCAP_VFPv3 == 0 && goarmsoftfp == 0 {
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print("runtime: this CPU has no VFPv3 floating point hardware, so it cannot run\n")
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print("a binary compiled for VFPv3 hard floating point. Recompile adding ,softfloat\n")
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print("to GOARM or changing GOARM to 6.\n")
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exit(1)
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}
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// osinit not called yet, so ncpu not set: must use getncpu directly.
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if getncpu() > 1 && goarm < 7 {
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print("runtime: this system has multiple CPUs and must use\n")
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print("atomic synchronization instructions. Recompile using GOARM=7.\n")
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exit(1)
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}
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}
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func archauxv(tag, val uintptr) {
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switch tag {
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case _AT_HWCAP:
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cpu.HWCap = uint(val)
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case _AT_HWCAP2:
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cpu.HWCap2 = uint(val)
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case _AT_PLATFORM:
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cpu.Platform = gostringnocopy((*byte)(unsafe.Pointer(val)))
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}
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}
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//go:nosplit
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func cputicks() int64 {
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// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
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return nanotime()
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}
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