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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"); \
- \
- 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) \
- : \
- : "r9", "r10", "r11", "r12", "cr0", "cr1", "cr5", \
- "cr6", "cr7", "xer", "lr", "ctr", "memory" \
- ); \
- _r3; \
- })
- #else
- #define VDSO_CALL(fn, nr, args...) fn(args)
- #endif
- #endif
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