1/*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2022 Keith Packard
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above
14 *    copyright notice, this list of conditions and the following
15 *    disclaimer in the documentation and/or other materials provided
16 *    with the distribution.
17 *
18 * 3. Neither the name of the copyright holder nor the names of its
19 *    contributors may be used to endorse or promote products derived
20 *    from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
33 * OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36#include <picolibc.h>
37
38	.text
39	.section	.text.opal_call
40	.align		2
41	.p2align	4,,15
42/*
43 * void
44 * opal_call(void *r3, void *r4, void *r5, int call_r6, void *base_r7, void *entry_r8);
45 */
46#ifdef __PPC64__
47	.global		opal_call
48	.section	".opd","aw"
49	.align		3
50opal_call:
51	.quad		.opal_call,.TOC.@tocbase,0
52	.previous
53#else
54opal_call:
55#endif
56	.type		opal_call, @function
57.opal_call:
58	.cfi_startproc
59
60	/* Save LR */
61	mflr		%r0
62	std		%r0, 16(%r1)
63	/* Save TOC */
64	std		%r2, 40(%r1)
65
66	/* Create a new stack frame */
67	stdu		%r1,-112(%r1)
68
69	/* Put 'call' in %r0 */
70	mr		%r0, %r6
71
72	/* Set OPAL TOC */
73	mr		%r2, %r7
74
75	/* Call OPAL */
76	mtctr		%r8
77	bctrl
78
79	nop
80
81	/* Pop stack frame */
82	addi		%r1, %r1, 112
83
84	/* Restore TOC */
85	ld		%r2, 40(%r1)
86
87	/* Restore LR */
88	ld		%r0, 16(%r1)
89	mtlr		%r0
90
91	/* All done */
92	blr
93
94	.cfi_endproc
95	.size		opal_call,.-.opal_call
96