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runtime: fix s390x build

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The new prototypes of duffzero and duffcopy must be
accompanied by functions. Otherwise buildmode=shared
(in particular, misc/cgo/testshared) has missing symbols.

The right fix, of course, is to implement these on s390x.

For #31916.

Change-Id: I3efff5e3011956341e1b26223a4847a8a91a0453
Reviewed-on: https://go-review.googlesource.com/c/go/+/176397
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
This commit is contained in:
Russ Cox 2019-05-09 18:34:29 -04:00
parent b8d5150f4a
commit 40657c282d
1 changed files with 19 additions and 0 deletions
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19
src/runtime/duff_s390x.s Normal file
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// Copyright 2019 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.
#include "go_asm.h"
#include "go_tls.h"
#include "textflag.h"
// s390x can copy/zero 1-256 bytes with a single instruction,
// so there's no need for these, except to satisfy the prototypes
// in stubs.go.
TEXT runtime·duffzero(SB),NOSPLIT|NOFRAME,$0-0
MOVD $0, 2(R0)
RET
TEXT runtime·duffcopy(SB),NOSPLIT|NOFRAME,$0-0
MOVD $0, 2(R0)
RET