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runtime: initialise cpu.HWCap on netbsd/arm64

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NetBSD does not supply AT_HWCAP, however we still need to initialise
cpu.HWCaps.  For now specify the bare minimum until we add some form of
capabilities detection. See
https://golang.org/issue/30824#issuecomment-494901591

Follows CL 174129 which did the same for openbsd/arm64.

Updates #30824

Change-Id: I43a86b583bc60d259a66772703de06970124bb7f
Reviewed-on: https://go-review.googlesource.com/c/go/+/257998
Trust: Tobias Klauser <tobias.klauser@gmail.com>
Trust: Benny Siegert <bsiegert@gmail.com>
Run-TryBot: Tobias Klauser <tobias.klauser@gmail.com>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
Reviewed-by: Benny Siegert <bsiegert@gmail.com>
TryBot-Result: Go Bot <gobot@golang.org>
This commit is contained in:
Tobias Klauser 2020-09-28 10:11:06 +02:00 committed by Tobias Klauser
parent af18bce87c
commit 1f4d035178
5 changed files with 21 additions and 1 deletions
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1
src/runtime/os_netbsd.go
View File

@ -359,6 +359,7 @@ func sysargs(argc int32, argv **byte) {
// now argv+n is auxv
auxv := (*[1 << 28]uintptr)(add(unsafe.Pointer(argv), uintptr(n)*sys.PtrSize))
sysauxv(auxv[:])
archauxv(auxv[:])
}
const (

3
src/runtime/os_netbsd_386.go
View File

@ -14,3 +14,6 @@ func lwp_mcontext_init(mc *mcontextt, stk unsafe.Pointer, mp *m, gp *g, fn uintp
mc.__gregs[_REG_EDX] = uint32(uintptr(unsafe.Pointer(gp)))
mc.__gregs[_REG_ESI] = uint32(fn)
}
func archauxv(auxv []uintptr) {
}

3
src/runtime/os_netbsd_amd64.go
View File

@ -14,3 +14,6 @@ func lwp_mcontext_init(mc *mcontextt, stk unsafe.Pointer, mp *m, gp *g, fn uintp
mc.__gregs[_REG_R9] = uint64(uintptr(unsafe.Pointer(gp)))
mc.__gregs[_REG_R12] = uint64(fn)
}
func archauxv(auxv []uintptr) {
}

3
src/runtime/os_netbsd_arm.go
View File

@ -32,3 +32,6 @@ func cputicks() int64 {
// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
return nanotime()
}
func archauxv(auxv []uintptr) {
}

12
src/runtime/os_netbsd_arm64.go
View File

@ -4,7 +4,10 @@
package runtime
import "unsafe"
import (
"internal/cpu"
"unsafe"
)
func lwp_mcontext_init(mc *mcontextt, stk unsafe.Pointer, mp *m, gp *g, fn uintptr) {
// Machine dependent mcontext initialisation for LWP.
@ -21,3 +24,10 @@ func cputicks() int64 {
// runtime·nanotime() is a poor approximation of CPU ticks that is enough for the profiler.
return nanotime()
}
func archauxv(auxv []uintptr) {
// NetBSD does not supply AT_HWCAP, however we still need to initialise cpu.HWCaps.
// For now specify the bare minimum until we add some form of capabilities
// detection. See issue https://golang.org/issue/30824#issuecomment-494901591
cpu.HWCap = 1<<1 | 1<<0 // ASIMD, FP
}