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 71