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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Macro to call vDSO functions
*
* Copyright (C) 2024 Christophe Leroy <christophe.leroy@csgroup.eu>, CS GROUP France
*/
#ifndef __VDSO_CALL_H__
#define __VDSO_CALL_H__
#ifdef __powerpc__
#define LOADARGS_1(fn, __arg1) do { \
_r0 = fn; \
_r3 = (long)__arg1; \
} while (0)
#define LOADARGS_2(fn, __arg1, __arg2) do { \
_r0 = fn; \
_r3 = (long)__arg1; \
_r4 = (long)__arg2; \
} while (0)
#define LOADARGS_3(fn, __arg1, __arg2, __arg3) do { \
_r0 = fn; \
_r3 = (long)__arg1; \
_r4 = (long)__arg2; \
_r5 = (long)__arg3; \
} while (0)
#define LOADARGS_5(fn, __arg1, __arg2, __arg3, __arg4, __arg5) do { \
_r0 = fn; \
_r3 = (long)__arg1; \
_r4 = (long)__arg2; \
_r5 = (long)__arg3; \
_r6 = (long)__arg4; \
_r7 = (long)__arg5; \
} while (0)
#define VDSO_CALL(fn, nr, args...) ({ \
register void *_r0 asm ("r0"); \
register long _r3 asm ("r3"); \
register long _r4 asm ("r4"); \
register long _r5 asm ("r5"); \
register long _r6 asm ("r6"); \
register long _r7 asm ("r7"); \
register long _r8 asm ("r8"); \
register long _rval asm ("r3"); \
\
LOADARGS_##nr(fn, args); \
\
asm volatile( \
" mtctr %0\n" \
" bctrl\n" \
" bns+ 1f\n" \
" neg 3, 3\n" \
"1:" \
: "+r" (_r0), "=r" (_r3), "+r" (_r4), "+r" (_r5), \
"+r" (_r6), "+r" (_r7), "+r" (_r8) \
: "r" (_rval) \
: "r9", "r10", "r11", "r12", "cr0", "cr1", "cr5", \
"cr6", "cr7", "xer", "lr", "ctr", "memory" \
); \
_rval; \
})
#else
#define VDSO_CALL(fn, nr, args...) fn(args)
#endif
#endif
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