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runtime: add windows/arm64 cgo-linking code

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This code is needed for use with cgo proper
(as opposed to hand-written DLL calls, which
we always use but only exercise cgo execution,
not cgo linking).

Change-Id: Iddc31d9c1c924d83d032b80dca65ddfda6624046
Reviewed-on: https://go-review.googlesource.com/c/go/+/312041
Trust: Russ Cox <rsc@golang.org>
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Cherry Zhang <cherryyz@google.com>
This commit is contained in:
Russ Cox 2021-04-14 12:33:51 -04:00
parent e5a6c5243c
commit 16330817aa
3 changed files with 64 additions and 1 deletions
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46
src/runtime/cgo/gcc_windows_arm64.c Normal file
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@ -0,0 +1,46 @@
// Copyright 2009 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.
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <process.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include "libcgo.h"
#include "libcgo_windows.h"
static void threadentry(void*);
static void (*setg_gcc)(void*);
void
x_cgo_init(G *g, void (*setg)(void*))
{
setg_gcc = setg;
}
void
_cgo_sys_thread_start(ThreadStart *ts)
{
uintptr_t thandle;
thandle = _beginthread(threadentry, 0, ts);
if(thandle == -1) {
fprintf(stderr, "runtime: failed to create new OS thread (%d)\n", errno);
abort();
}
}
extern void crosscall1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
static void
threadentry(void *v)
{
ThreadStart ts;
ts = *(ThreadStart*)v;
free(v);
crosscall1(ts.fn, setg_gcc, (void *)ts.g);
}

17
src/runtime/rt0_windows_arm64.s
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@ -10,3 +10,20 @@
// kernel for an ordinary -buildmode=exe program.
TEXT _rt0_arm64_windows(SB),NOSPLIT|NOFRAME,$0
B ·rt0_go(SB)
TEXT _rt0_arm64_windows_lib(SB),NOSPLIT|NOFRAME,$0
MOVD $_rt0_arm64_windows_lib_go(SB), R0
MOVD $0, R1
MOVD _cgo_sys_thread_create(SB), R2
B (R2)
TEXT _rt0_arm64_windows_lib_go(SB),NOSPLIT|NOFRAME,$0
MOVD $0, R0
MOVD $0, R1
MOVD $runtime·rt0_go(SB), R2
B (R2)
TEXT main(SB),NOSPLIT,$0
MOVD $runtime·rt0_go(SB), R2
B (R2)

2
src/runtime/sys_windows_arm.s
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@ -335,7 +335,7 @@ TEXT runtime·switchtothread(SB),NOSPLIT|NOFRAME,$0
TEXT ·publicationBarrier(SB),NOSPLIT|NOFRAME,$0-0
B runtime·armPublicationBarrier(SB)
// never called (cgo not supported)
// never called (this is a GOARM=7 platform)
TEXT runtime·read_tls_fallback(SB),NOSPLIT|NOFRAME,$0
MOVW $0xabcd, R0
MOVW R0, (R0)