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| author | Michael Munday <munday@ca.ibm.com> | 2016-03-18 19:09:39 -0400 |
|---|---|---|
| committer | Brad Fitzpatrick <bradfitz@golang.org> | 2016-04-07 18:56:54 +0000 |
| commit | e6f36f0cd5b45b9ce7809a34c45aeb66a5ca64a4 (patch) | |
| tree | 7c1bdb2891026c7593505d248a7a509e4ab05bc7 /src/runtime/tls_s390x.s | |
| parent | 9658b7ef83ae9c34f4a52680e7102d958577d5bb (diff) | |
| download | go-e6f36f0cd5b45b9ce7809a34c45aeb66a5ca64a4.tar.gz go-e6f36f0cd5b45b9ce7809a34c45aeb66a5ca64a4.zip | |
runtime: add s390x support (new files and lfstack_64bit.go modifications)
Change-Id: I51c0a332e3cbdab348564e5dcd27583e75e4b881
Reviewed-on: https://go-review.googlesource.com/20946
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Diffstat (limited to 'src/runtime/tls_s390x.s')
| -rw-r--r-- | src/runtime/tls_s390x.s | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/src/runtime/tls_s390x.s b/src/runtime/tls_s390x.s new file mode 100644 index 0000000000..cb6a21c114 --- /dev/null +++ b/src/runtime/tls_s390x.s @@ -0,0 +1,51 @@ +// Copyright 2016 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 "funcdata.h" +#include "textflag.h" + +// We have to resort to TLS variable to save g (R13). +// One reason is that external code might trigger +// SIGSEGV, and our runtime.sigtramp don't even know we +// are in external code, and will continue to use R13, +// this might well result in another SIGSEGV. + +// save_g saves the g register into pthread-provided +// thread-local memory, so that we can call externally compiled +// s390x code that will overwrite this register. +// +// If !iscgo, this is a no-op. +// +// NOTE: setg_gcc<> assume this clobbers only R10 and R11. +TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0-0 + MOVB runtime·iscgo(SB), R10 + CMPBEQ R10, $0, nocgo + MOVW AR0, R11 + SLD $32, R11 + MOVW AR1, R11 + MOVD runtime·tls_g(SB), R10 + MOVD g, 0(R10)(R11*1) +nocgo: + RET + +// load_g loads the g register from pthread-provided +// thread-local memory, for use after calling externally compiled +// s390x code that overwrote those registers. +// +// This is never called directly from C code (it doesn't have to +// follow the C ABI), but it may be called from a C context, where the +// usual Go registers aren't set up. +// +// NOTE: _cgo_topofstack assumes this only clobbers g (R13), R10 and R11. +TEXT runtime·load_g(SB),NOSPLIT|NOFRAME,$0-0 + MOVW AR0, R11 + SLD $32, R11 + MOVW AR1, R11 + MOVD runtime·tls_g(SB), R10 + MOVD 0(R10)(R11*1), g + RET + +GLOBL runtime·tls_g+0(SB),TLSBSS,$8 |