1/* SPDX-License-Identifier: GPL-2.0 */
 2/*
 3 * Macro to call vDSO functions
 4 *
 5 * Copyright (C) 2024 Christophe Leroy <christophe.leroy@csgroup.eu>, CS GROUP France
 6 */
 7#ifndef __VDSO_CALL_H__
 8#define __VDSO_CALL_H__
 9
10#ifdef __powerpc__
11
12#define LOADARGS_1(fn, __arg1) do {					\
13	_r0 = fn;							\
14	_r3 = (long)__arg1;						\
15} while (0)
16
17#define LOADARGS_2(fn, __arg1, __arg2) do {				\
18	_r0 = fn;							\
19	_r3 = (long)__arg1;						\
20	_r4 = (long)__arg2;						\
21} while (0)
22
23#define LOADARGS_3(fn, __arg1, __arg2, __arg3) do {			\
24	_r0 = fn;							\
25	_r3 = (long)__arg1;						\
26	_r4 = (long)__arg2;						\
27	_r5 = (long)__arg3;						\
28} while (0)
29
30#define LOADARGS_5(fn, __arg1, __arg2, __arg3, __arg4, __arg5) do {	\
31	_r0 = fn;							\
32	_r3 = (long)__arg1;						\
33	_r4 = (long)__arg2;						\
34	_r5 = (long)__arg3;						\
35	_r6 = (long)__arg4;						\
36	_r7 = (long)__arg5;						\
37} while (0)
38
39#define VDSO_CALL(fn, nr, args...) ({					\
40	register void *_r0 asm ("r0");					\
41	register long _r3 asm ("r3");					\
42	register long _r4 asm ("r4");					\
43	register long _r5 asm ("r5");					\
44	register long _r6 asm ("r6");					\
45	register long _r7 asm ("r7");					\
46	register long _r8 asm ("r8");					\
47	register long _rval asm ("r3");					\
48									\
49	LOADARGS_##nr(fn, args);					\
50									\
51	asm volatile(							\
52		"	mtctr %0\n"					\
53		"	bctrl\n"					\
54		"	bns+	1f\n"					\
55		"	neg	3, 3\n"					\
56		"1:"							\
57		: "+r" (_r0), "=r" (_r3), "+r" (_r4), "+r" (_r5),	\
58		  "+r" (_r6), "+r" (_r7), "+r" (_r8)			\
59		: "r" (_rval)						\
60		: "r9", "r10", "r11", "r12", "cr0", "cr1", "cr5",	\
61		  "cr6", "cr7", "xer", "lr", "ctr", "memory"		\
62	);								\
63	_rval;								\
64})
65
66#else
67#define VDSO_CALL(fn, nr, args...)	fn(args)
68#endif
69
70#endif