/*

 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2014, Red Hat Inc. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code is distributed in the hope that it will be useful, but WITHOUT

 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#include "precompiled.hpp"

#include "asm/macroAssembler.hpp"

#include "asm/macroAssembler.inline.hpp"

#include "runtime/os.hpp"

#include "runtime/threadLocalStorage.hpp"

// get_thread can be called anywhere inside generated code so we need

// to save whatever non-callee save context might get clobbered by the

// call to the C thread_local lookup call or, indeed, the call setup

// code. x86 appears to save C arg registers.

void MacroAssembler::get_thread(Register dst) {

  // call pthread_getspecific

  // void * pthread_getspecific(pthread_key_t key);

  // Save all call-clobbered regs except dst, plus r19 and r20.

  RegSet saved_regs = RegSet::range(r0, r20) + lr - dst;

  push(saved_regs, sp);

  mov(c_rarg0, ThreadLocalStorage::thread_index());

  mov(r19, CAST_FROM_FN_PTR(address, pthread_getspecific));

  blrt(r19, 1, 0, 1);

  if (dst != c_rarg0) {

    mov(dst, c_rarg0);

  }

  // restore pushed registers

  pop(saved_regs, sp);

}