code review 109050043: all: remove 'extern register M *m' from runtime

src/pkg/runtime/cgo/gcc_linux_arm.c

 // 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"
 
 static void *threadentry(void*);
 
-static void (*setmg_gcc)(void*, void*);
+static void (*setg_gcc)(void*);
 
 void
-x_cgo_init(G *g, void (*setmg)(void*, void*))
+x_cgo_init(G *g, void (*setg)(void*))
 {
         pthread_attr_t attr;
         size_t size;
 
-        setmg_gcc = setmg;
+        setg_gcc = setg;
         pthread_attr_init(&attr);
         pthread_attr_getstacksize(&attr, &size);
         g->stackguard = (uintptr)&attr - size + 4096;
         pthread_attr_destroy(&attr);
 }
 
 
 void
 _cgo_sys_thread_start(ThreadStart *ts)
 {
@@ skipping 17 matching lines @@
         err = pthread_create(&p, &attr, threadentry, ts);
 
         pthread_sigmask(SIG_SETMASK, &oset, nil);
 
         if (err != 0) {
                 fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
                 abort();
         }
 }
 
-extern void crosscall_arm2(void (*fn)(void), void (*setmg_gcc)(void*, void*), void*, void*);
+extern void crosscall_arm1(void (*fn)(void), void (*setg_gcc)(void*), void *g);
 static void*
 threadentry(void *v)
 {
         ThreadStart ts;
 
         ts = *(ThreadStart*)v;
         free(v);
 
         ts.g->stackbase = (uintptr)&ts;
 
         /*
          * _cgo_sys_thread_start set stackguard to stack size;
          * change to actual guard pointer.
          */
         ts.g->stackguard = (uintptr)&ts - ts.g->stackguard + 4096 * 2;
 
-        crosscall_arm2(ts.fn, setmg_gcc, (void*)ts.m, (void*)ts.g);
+        crosscall_arm1(ts.fn, setg_gcc, (void*)ts.g);
         return nil;
 }