runtime/cgo: consolidate linux cgo code

Much of the gcc_linux_*.c code is identical and duplicated across
architectures. Consolidate code for 386, arm, loong64, mips* and
riscv64, where the only difference is the build tags (386 also
has some non-functional ordering differences).

Change-Id: I14ee9a4cc6b72e165239d196b68b6343efaddf0a
Reviewed-on: https://go-review.googlesource.com/c/go/+/518620
Run-TryBot: Joel Sing <joel@sing.id.au>
Reviewed-by: Ian Lance Taylor <iant@google.com>
TryBot-Result: Gopher Robot <gobot@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>

6 files changed, 4 insertions, 322 deletions

diff --git a/src/runtime/cgo/gcc_linux_386.c b/src/runtime/cgo/gcc_linux.c
index 9c23c90308..9624df596f 100644
--- a/src/runtime/cgo/gcc_linux_386.c
+++ b/src/runtime/cgo/gcc_linux.c
@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build linux && (386 || arm || loong64 || mips || mipsle || mips64 || mips64le || riscv64)
+
 #include <pthread.h>
 #include <string.h>
 #include <signal.h>
@@ -9,15 +11,15 @@
 #include "libcgo_unix.h"
 
 static void *threadentry(void*);
-static void (*setg_gcc)(void*);
 
-// This will be set in gcc_android.c for android-specific customization.
 void (*x_cgo_inittls)(void **tlsg, void **tlsbase) __attribute__((common));
+static void (*setg_gcc)(void*);
 
 void
 x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
 {
 	setg_gcc = setg;
+
 	_cgo_set_stacklo(g, NULL);
 
 	if (x_cgo_inittls) {
diff --git a/src/runtime/cgo/gcc_linux_arm.c b/src/runtime/cgo/gcc_linux_arm.c
deleted file mode 100644
index 6ebb6c82f6..0000000000
--- a/src/runtime/cgo/gcc_linux_arm.c
+++ /dev/null
@@ -1,63 +0,0 @@
-// Copyright 2010 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 <pthread.h>
-#include <string.h>
-#include <signal.h>
-#include "libcgo.h"
-#include "libcgo_unix.h"
-
-static void *threadentry(void*);
-
-void (*x_cgo_inittls)(void **tlsg, void **tlsbase) __attribute__((common));
-static void (*setg_gcc)(void*);
-
-void
-_cgo_sys_thread_start(ThreadStart *ts)
-{
-	pthread_attr_t attr;
-	sigset_t ign, oset;
-	pthread_t p;
-	size_t size;
-	int err;
-
-	sigfillset(&ign);
-	pthread_sigmask(SIG_SETMASK, &ign, &oset);
-
-	pthread_attr_init(&attr);
-	pthread_attr_getstacksize(&attr, &size);
-	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
-	ts->g->stackhi = size;
-	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
-
-	pthread_sigmask(SIG_SETMASK, &oset, nil);
-
-	if (err != 0) {
-		fatalf("pthread_create failed: %s", strerror(err));
-	}
-}
-
-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);
-	return nil;
-}
-
-void
-x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
-{
-	setg_gcc = setg;
-	_cgo_set_stacklo(g, NULL);
-
-	if (x_cgo_inittls) {
-		x_cgo_inittls(tlsg, tlsbase);
-	}
-}
diff --git a/src/runtime/cgo/gcc_linux_loong64.c b/src/runtime/cgo/gcc_linux_loong64.c
deleted file mode 100644
index b7363ccd96..0000000000
--- a/src/runtime/cgo/gcc_linux_loong64.c
+++ /dev/null
@@ -1,63 +0,0 @@
-// Copyright 2022 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 <pthread.h>
-#include <string.h>
-#include <signal.h>
-#include "libcgo.h"
-#include "libcgo_unix.h"
-
-static void *threadentry(void*);
-
-void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
-static void (*setg_gcc)(void*);
-
-void
-_cgo_sys_thread_start(ThreadStart *ts)
-{
-	pthread_attr_t attr;
-	sigset_t ign, oset;
-	pthread_t p;
-	size_t size;
-	int err;
-
-	sigfillset(&ign);
-	pthread_sigmask(SIG_SETMASK, &ign, &oset);
-
-	pthread_attr_init(&attr);
-	pthread_attr_getstacksize(&attr, &size);
-	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
-	ts->g->stackhi = size;
-	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
-
-	pthread_sigmask(SIG_SETMASK, &oset, nil);
-
-	if (err != 0) {
-		fatalf("pthread_create failed: %s", strerror(err));
-	}
-}
-
-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);
-	return nil;
-}
-
-void
-x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
-{
-	setg_gcc = setg;
-	_cgo_set_stacklo(g, NULL);
-
-	if (x_cgo_inittls) {
-		x_cgo_inittls(tlsg, tlsbase);
-	}
-}
diff --git a/src/runtime/cgo/gcc_linux_mips64x.c b/src/runtime/cgo/gcc_linux_mips64x.c
deleted file mode 100644
index 6f4b52e2b0..0000000000
--- a/src/runtime/cgo/gcc_linux_mips64x.c
+++ /dev/null
@@ -1,65 +0,0 @@
-// 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.
-
-//go:build linux && (mips64 || mips64le)
-
-#include <pthread.h>
-#include <string.h>
-#include <signal.h>
-#include "libcgo.h"
-#include "libcgo_unix.h"
-
-static void *threadentry(void*);
-
-void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
-static void (*setg_gcc)(void*);
-
-void
-_cgo_sys_thread_start(ThreadStart *ts)
-{
-	pthread_attr_t attr;
-	sigset_t ign, oset;
-	pthread_t p;
-	size_t size;
-	int err;
-
-	sigfillset(&ign);
-	pthread_sigmask(SIG_SETMASK, &ign, &oset);
-
-	pthread_attr_init(&attr);
-	pthread_attr_getstacksize(&attr, &size);
-	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
-	ts->g->stackhi = size;
-	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
-
-	pthread_sigmask(SIG_SETMASK, &oset, nil);
-
-	if (err != 0) {
-		fatalf("pthread_create failed: %s", strerror(err));
-	}
-}
-
-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);
-	return nil;
-}
-
-void
-x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
-{
-	setg_gcc = setg;
-	_cgo_set_stacklo(g, NULL);
-
-	if (x_cgo_inittls) {
-		x_cgo_inittls(tlsg, tlsbase);
-	}
-}
diff --git a/src/runtime/cgo/gcc_linux_mipsx.c b/src/runtime/cgo/gcc_linux_mipsx.c
deleted file mode 100644
index f6470d66dc..0000000000
--- a/src/runtime/cgo/gcc_linux_mipsx.c
+++ /dev/null
@@ -1,66 +0,0 @@
-// 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.
-
-//go:build linux && (mips || mipsle)
-
-#include <pthread.h>
-#include <string.h>
-#include <signal.h>
-#include "libcgo.h"
-#include "libcgo_unix.h"
-
-static void *threadentry(void*);
-
-void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
-static void (*setg_gcc)(void*);
-
-void
-_cgo_sys_thread_start(ThreadStart *ts)
-{
-	pthread_attr_t attr;
-	sigset_t ign, oset;
-	pthread_t p;
-	size_t size;
-	int err;
-
-	sigfillset(&ign);
-	pthread_sigmask(SIG_SETMASK, &ign, &oset);
-
-	pthread_attr_init(&attr);
-	pthread_attr_getstacksize(&attr, &size);
-	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
-	ts->g->stackhi = size;
-	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
-
-	pthread_sigmask(SIG_SETMASK, &oset, nil);
-
-	if (err != 0) {
-		fatalf("pthread_create failed: %s", strerror(err));
-	}
-}
-
-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);
-	return nil;
-}
-
-void
-x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
-{
-	setg_gcc = setg;
-
-	_cgo_set_stacklo(g, NULL);
-
-	if (x_cgo_inittls) {
-		x_cgo_inittls(tlsg, tlsbase);
-	}
-}
diff --git a/src/runtime/cgo/gcc_linux_riscv64.c b/src/runtime/cgo/gcc_linux_riscv64.c
deleted file mode 100644
index ee4981104a..0000000000
--- a/src/runtime/cgo/gcc_linux_riscv64.c
+++ /dev/null
@@ -1,63 +0,0 @@
-// Copyright 2020 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 <pthread.h>
-#include <string.h>
-#include <signal.h>
-#include "libcgo.h"
-#include "libcgo_unix.h"
-
-static void *threadentry(void*);
-
-void (*x_cgo_inittls)(void **tlsg, void **tlsbase);
-static void (*setg_gcc)(void*);
-
-void
-_cgo_sys_thread_start(ThreadStart *ts)
-{
-	pthread_attr_t attr;
-	sigset_t ign, oset;
-	pthread_t p;
-	size_t size;
-	int err;
-
-	sigfillset(&ign);
-	pthread_sigmask(SIG_SETMASK, &ign, &oset);
-
-	pthread_attr_init(&attr);
-	pthread_attr_getstacksize(&attr, &size);
-	// Leave stacklo=0 and set stackhi=size; mstart will do the rest.
-	ts->g->stackhi = size;
-	err = _cgo_try_pthread_create(&p, &attr, threadentry, ts);
-
-	pthread_sigmask(SIG_SETMASK, &oset, nil);
-
-	if (err != 0) {
-		fatalf("pthread_create failed: %s", strerror(err));
-	}
-}
-
-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);
-	return nil;
-}
-
-void
-x_cgo_init(G *g, void (*setg)(void*), void **tlsg, void **tlsbase)
-{
-	setg_gcc = setg;
-	_cgo_set_stacklo(g, NULL);
-
-	if (x_cgo_inittls) {
-		x_cgo_inittls(tlsg, tlsbase);
-	}
-}