/* 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