1/*
2 * Copyright (C) 2014 Google Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions are
6 * met:
7 *
8 *     * Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *     * Redistributions in binary form must reproduce the above
11 * copyright notice, this list of conditions and the following disclaimer
12 * in the documentation and/or other materials provided with the
13 * distribution.
14 *     * Neither the name of Google Inc. nor the names of its
15 * contributors may be used to endorse or promote products derived from
16 * this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29 */
30
31
32/*
33 * typedef void (*PushAllRegistersCallback)(SafePointBarrier*, ThreadState*, intptr_t*);
34 * extern "C" void pushAllRegisters(SafePointBarrier*, ThreadState*, PushAllRegistersCallback)
35 */
36
37.type pushAllRegisters, %function
38.global pushAllRegisters
39.hidden pushAllRegisters
40pushAllRegisters:
41        /* Save return address. */
42        sub sp, sp, #96
43        stp x19, x20, [sp, #80]
44        stp x21, x22, [sp, #64]
45        stp x23, x24, [sp, #48]
46        stp x25, x26, [sp, #32]
47        stp x27, x28, [sp, #16]
48        stp x30, x29, [sp, #0]  // x30 is lr.
49
50        /* Pass the two first arguments unchanged (x0, x1)
51         * and pass the stack pointer as third argument to the
52         * callback function.
53         */
54        mov x3, x2
55        mov x2, sp
56        blr x3
57
58        /* We don't restore all registers since they are callee saved (so
59         * the callback didn't clobber them) and we didn't modify them either.
60         */
61        ldr x30, [sp], #96
62        ret
63