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go/src/runtime/tls_ppc64x.s

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all: make copyright headers consistent with one space after period This is a subset of https://golang.org/cl/20022 with only the copyright header lines, so the next CL will be smaller and more reviewable. Go policy has been single space after periods in comments for some time. The copyright header template at: https://golang.org/doc/contribute.html#copyright also uses a single space. Make them all consistent. Change-Id: Icc26c6b8495c3820da6b171ca96a74701b4a01b0 Reviewed-on: https://go-review.googlesource.com/20111 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org> Reviewed-by: Matthew Dempsky <mdempsky@google.com> TryBot-Result: Gobot Gobot <gobot@golang.org>
2016-03-01 15:57:46 -07:00
// Copyright 2014 The Go Authors. All rights reserved.
runtime: set up C TLS and save g to it on ppc64 Cgo will need this for calls from C to Go and for handling signals that may occur in C code. Change-Id: I50cc4caf17cd142bff501e7180a1e27721463ada Reviewed-on: https://go-review.googlesource.com/2008 Reviewed-by: Russ Cox <rsc@golang.org>
2014-12-16 15:14:00 -07:00
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build ppc64 ppc64le
#include "go_asm.h"
#include "go_tls.h"
#include "funcdata.h"
#include "textflag.h"
// We have to resort to TLS variable to save g (R30).
// 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 R30,
// 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
// ppc64 code that will overwrite this register.
//
// If !iscgo, this is a no-op.
cmd/cgo, runtime/cgo: support ppc64 This implements support for calls to and from C in the ppc64 C ABI, as well as supporting functionality such as an entry point from the dynamic linker. Change-Id: I68da6df50d5638cb1a3d3fef773fb412d7bf631a Reviewed-on: https://go-review.googlesource.com/2009 Reviewed-by: Russ Cox <rsc@golang.org>
2014-12-16 16:34:55 -07:00
//
// NOTE: setg_gcc<> assume this clobbers only R31.
cmd/internal/obj, runtime: add NOFRAME flag to suppress stack frame set up on ppc64x Replace the confusing game where a frame size of $-8 would suppress the implicit setting up of a stack frame with a nice explicit flag. The code to set up the function prologue is still a little confusing but better than it was. Change-Id: I1d49278ff42c6bc734ebfb079998b32bc53f8d9a Reviewed-on: https://go-review.googlesource.com/15670 Reviewed-by: Minux Ma <minux@golang.org>
2015-10-08 17:44:27 -06:00
TEXT runtime·save_g(SB),NOSPLIT|NOFRAME,$0-0
runtime: set up C TLS and save g to it on ppc64 Cgo will need this for calls from C to Go and for handling signals that may occur in C code. Change-Id: I50cc4caf17cd142bff501e7180a1e27721463ada Reviewed-on: https://go-review.googlesource.com/2008 Reviewed-by: Russ Cox <rsc@golang.org>
2014-12-16 15:14:00 -07:00
MOVB runtime·iscgo(SB), R31
CMP R31, $0
BEQ nocgo
cmd/internal/obj, cmd/link, runtime: handle TLS more like a platform linker on ppc64 On ppc64x, the thread pointer, held in R13, points 0x7000 bytes past where thread-local storage begins (presumably to maximize the amount of storage that can be accessed with a 16-bit signed displacement). The relocations used to indicate thread-local storage to the platform linker account for this, so to be able to support external linking we need to change things so the linker applies this offset instead of the runtime assembly. Change-Id: I2556c249ab2d802cae62c44b2b4c5b44787d7059 Reviewed-on: https://go-review.googlesource.com/14233 Reviewed-by: Russ Cox <rsc@golang.org> Reviewed-by: Austin Clements <austin@google.com>
2015-10-29 15:13:13 -06:00
MOVD runtime·tls_g(SB), R31
cmd/internal/obj, runtime: implement IE model TLS on ppc64le This requires changing the tls access code to match the patterns documented in the ABI documentation or the system linker will "optimize" it into ridiculousness. With this change, -buildmode=pie works, although as it is tested in testshared, the tests are not run yet. Change-Id: I1efa6687af0a5b8db3385b10f6542a49056b2eb3 Reviewed-on: https://go-review.googlesource.com/15971 Reviewed-by: Russ Cox <rsc@golang.org>
2015-10-16 02:15:18 -06:00
MOVD g, 0(R13)(R31*1)
runtime: set up C TLS and save g to it on ppc64 Cgo will need this for calls from C to Go and for handling signals that may occur in C code. Change-Id: I50cc4caf17cd142bff501e7180a1e27721463ada Reviewed-on: https://go-review.googlesource.com/2008 Reviewed-by: Russ Cox <rsc@golang.org>
2014-12-16 15:14:00 -07:00
nocgo:
RET
// load_g loads the g register from pthread-provided
// thread-local memory, for use after calling externally compiled
// ppc64 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.
cmd/cgo, runtime/cgo: support ppc64 This implements support for calls to and from C in the ppc64 C ABI, as well as supporting functionality such as an entry point from the dynamic linker. Change-Id: I68da6df50d5638cb1a3d3fef773fb412d7bf631a Reviewed-on: https://go-review.googlesource.com/2009 Reviewed-by: Russ Cox <rsc@golang.org>
2014-12-16 16:34:55 -07:00
//
// NOTE: _cgo_topofstack assumes this only clobbers g (R30), and R31.
cmd/internal/obj, runtime: add NOFRAME flag to suppress stack frame set up on ppc64x Replace the confusing game where a frame size of $-8 would suppress the implicit setting up of a stack frame with a nice explicit flag. The code to set up the function prologue is still a little confusing but better than it was. Change-Id: I1d49278ff42c6bc734ebfb079998b32bc53f8d9a Reviewed-on: https://go-review.googlesource.com/15670 Reviewed-by: Minux Ma <minux@golang.org>
2015-10-08 17:44:27 -06:00
TEXT runtime·load_g(SB),NOSPLIT|NOFRAME,$0-0
cmd/internal/obj, cmd/link, runtime: handle TLS more like a platform linker on ppc64 On ppc64x, the thread pointer, held in R13, points 0x7000 bytes past where thread-local storage begins (presumably to maximize the amount of storage that can be accessed with a 16-bit signed displacement). The relocations used to indicate thread-local storage to the platform linker account for this, so to be able to support external linking we need to change things so the linker applies this offset instead of the runtime assembly. Change-Id: I2556c249ab2d802cae62c44b2b4c5b44787d7059 Reviewed-on: https://go-review.googlesource.com/14233 Reviewed-by: Russ Cox <rsc@golang.org> Reviewed-by: Austin Clements <austin@google.com>
2015-10-29 15:13:13 -06:00
MOVD runtime·tls_g(SB), R31
cmd/internal/obj, runtime: implement IE model TLS on ppc64le This requires changing the tls access code to match the patterns documented in the ABI documentation or the system linker will "optimize" it into ridiculousness. With this change, -buildmode=pie works, although as it is tested in testshared, the tests are not run yet. Change-Id: I1efa6687af0a5b8db3385b10f6542a49056b2eb3 Reviewed-on: https://go-review.googlesource.com/15971 Reviewed-by: Russ Cox <rsc@golang.org>
2015-10-16 02:15:18 -06:00
MOVD 0(R13)(R31*1), g
runtime: set up C TLS and save g to it on ppc64 Cgo will need this for calls from C to Go and for handling signals that may occur in C code. Change-Id: I50cc4caf17cd142bff501e7180a1e27721463ada Reviewed-on: https://go-review.googlesource.com/2008 Reviewed-by: Russ Cox <rsc@golang.org>
2014-12-16 15:14:00 -07:00
RET
cmd/internal/obj, cmd/link, runtime: lots of TLS cleanup It's particularly nice to get rid of the android special cases in the linker. Change-Id: I516363af7ce8a6b2f196fe49cb8887ac787a6dad Reviewed-on: https://go-review.googlesource.com/14197 Run-TryBot: Michael Hudson-Doyle <michael.hudson@canonical.com> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
2015-09-01 17:23:15 -06:00
GLOBL runtime·tls_g+0(SB), TLSBSS, $8
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