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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