From 80f18fc933cf3f3e829c5455a1023d69f7b86e52 Mon Sep 17 00:00:00 2001
From: Ondřej Surý <ondrej@sury.org>
Date: Tue, 13 Sep 2011 13:11:55 +0200
Subject: Imported Upstream version 60

---
 src/pkg/runtime/cgo/darwin_386.c | 149 ---------------------------------------
 1 file changed, 149 deletions(-)
 delete mode 100644 src/pkg/runtime/cgo/darwin_386.c

(limited to 'src/pkg/runtime/cgo/darwin_386.c')

diff --git a/src/pkg/runtime/cgo/darwin_386.c b/src/pkg/runtime/cgo/darwin_386.c
deleted file mode 100644
index 6d4e259be..000000000
--- a/src/pkg/runtime/cgo/darwin_386.c
+++ /dev/null
@@ -1,149 +0,0 @@
-// 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.
-
-#include <pthread.h>
-#include "libcgo.h"
-
-static void* threadentry(void*);
-static pthread_key_t k1, k2;
-
-#define magic1 (0x23581321U)
-
-static void
-inittls(void)
-{
-	uint32 x, y;
-	pthread_key_t tofree[128], k;
-	int i, ntofree;
-	int havek1, havek2;
-
-	/*
-	 * Allocate thread-local storage slots for m, g.
-	 * The key numbers start at 0x100, and we expect to be
-	 * one of the early calls to pthread_key_create, so we
-	 * should be able to get pretty low numbers.
-	 *
-	 * In Darwin/386 pthreads, %gs points at the thread
-	 * structure, and each key is an index into the thread-local
-	 * storage array that begins at offset 0x48 within in that structure.
-	 * It may happen that we are not quite the first function to try
-	 * to allocate thread-local storage keys, so instead of depending
-	 * on getting 0x100 and 0x101, we try for 0x108 and 0x109,
-	 * allocating keys until we get the ones we want and then freeing
-	 * the ones we didn't want.
-	 *
-	 * Thus the final offsets to use in %gs references are
-	 * 0x48+4*0x108 = 0x468 and 0x48+4*0x109 = 0x46c.
-	 *
-	 * The linker and runtime hard-code these constant offsets
-	 * from %gs where we expect to find m and g.
-	 * Known to ../cmd/8l/obj.c:/468
-	 * and to ../pkg/runtime/darwin/386/sys.s:/468
-	 *
-	 * This is truly disgusting and a bit fragile, but taking care
-	 * of it here protects the rest of the system from damage.
-	 * The alternative would be to use a global variable that
-	 * held the offset and refer to that variable each time we
-	 * need a %gs variable (m or g).  That approach would
-	 * require an extra instruction and memory reference in
-	 * every stack growth prolog and would also require
-	 * rewriting the code that 8c generates for extern registers.
-	 *
-	 * Things get more disgusting on OS X 10.7 Lion.
-	 * The 0x48 base mentioned above is the offset of the tsd
-	 * array within the per-thread structure on Leopard and Snow Leopard.
-	 * On Lion, the base moved a little, so while the math above
-	 * still applies, the base is different.  Thus, we cannot
-	 * look for specific key values if we want to build binaries
-	 * that run on both systems.  Instead, forget about the
-	 * specific key values and just allocate and initialize per-thread
-	 * storage until we find a key that writes to the memory location
-	 * we want.  Then keep that key.
-	 */
-	havek1 = 0;
-	havek2 = 0;
-	ntofree = 0;
-	while(!havek1 || !havek2) {
-		if(pthread_key_create(&k, nil) < 0) {
-			fprintf(stderr, "runtime/cgo: pthread_key_create failed\n");
-			abort();
-		}
-		pthread_setspecific(k, (void*)magic1);
-		asm volatile("movl %%gs:0x468, %0" : "=r"(x));
-		asm volatile("movl %%gs:0x46c, %0" : "=r"(y));
-		if(x == magic1) {
-			havek1 = 1;
-			k1 = k;
-		} else if(y == magic1) {
-			havek2 = 1;
-			k2 = k;
-		} else {
-			if(ntofree >= nelem(tofree)) {
-				fprintf(stderr, "runtime/cgo: could not obtain pthread_keys\n");
-				fprintf(stderr, "\ttried");
-				for(i=0; i<ntofree; i++)
-					fprintf(stderr, " %#x", (unsigned)tofree[i]);
-				fprintf(stderr, "\n");
-				abort();
-			}
-			tofree[ntofree++] = k;
-		}
-		pthread_setspecific(k, 0);
-	}
-
-	/*
-	 * We got the keys we wanted.  Free the others.
-	 */
-	for(i=0; i<ntofree; i++)
-		pthread_key_delete(tofree[i]);
-}
-
-static void
-xinitcgo(void)
-{
-	inittls();
-}
-
-void (*initcgo)(void) = xinitcgo;
-
-void
-libcgo_sys_thread_start(ThreadStart *ts)
-{
-	pthread_attr_t attr;
-	pthread_t p;
-	size_t size;
-	int err;
-
-	pthread_attr_init(&attr);
-	pthread_attr_getstacksize(&attr, &size);
-	ts->g->stackguard = size;
-	err = pthread_create(&p, &attr, threadentry, ts);
-	if (err != 0) {
-		fprintf(stderr, "runtime/cgo: pthread_create failed: %s\n", strerror(err));
-		abort();
-	}
-}
-
-static void*
-threadentry(void *v)
-{
-	ThreadStart ts;
-
-	ts = *(ThreadStart*)v;
-	free(v);
-
-	ts.g->stackbase = (uintptr)&ts;
-
-	/*
-	 * libcgo_sys_thread_start set stackguard to stack size;
-	 * change to actual guard pointer.
-	 */
-	ts.g->stackguard = (uintptr)&ts - ts.g->stackguard + 4096;
-
-	pthread_setspecific(k1, (void*)ts.g);
-	pthread_setspecific(k2, (void*)ts.m);
-
-	crosscall_386(ts.fn);
-	return nil;
-}
-- 
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