1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2012 ARM Limited 4 * Copyright (C) 2014 Regents of the University of California 5 * Copyright (C) 2017 SiFive 6 */ 7 8 #ifndef _ASM_RISCV_VDSO_H 9 #define _ASM_RISCV_VDSO_H 10 11 /* 12 * All systems with an MMU have a VDSO, but systems without an MMU don't 13 * support shared libraries and therefore don't have one. 14 */ 15 16 #define __VDSO_PAGES 4 17 18 #ifndef __ASSEMBLER__ 19 20 #ifdef CONFIG_MMU 21 #include <generated/vdso-offsets.h> 22 #endif 23 24 #ifdef CONFIG_RISCV_USER_CFI 25 #include <generated/vdso-cfi-offsets.h> 26 #endif 27 28 #ifdef CONFIG_RISCV_USER_CFI 29 #define VDSO_SYMBOL(base, name) \ 30 (riscv_has_extension_unlikely(RISCV_ISA_EXT_ZIMOP) ? \ 31 (void __user *)((unsigned long)(base) + __vdso_##name##_cfi_offset) : \ 32 (void __user *)((unsigned long)(base) + __vdso_##name##_offset)) 33 #else 34 #define VDSO_SYMBOL(base, name) \ 35 ((void __user *)((unsigned long)(base) + __vdso_##name##_offset)) 36 #endif 37 38 #ifdef CONFIG_COMPAT 39 #include <generated/compat_vdso-offsets.h> 40 41 #define COMPAT_VDSO_SYMBOL(base, name) \ 42 (void __user *)((unsigned long)(base) + compat__vdso_##name##_offset) 43 44 #endif /* CONFIG_COMPAT */ 45 46 extern char vdso_start[], vdso_end[]; 47 extern char vdso_cfi_start[], vdso_cfi_end[]; 48 extern char compat_vdso_start[], compat_vdso_end[]; 49 50 #endif /* !__ASSEMBLER__ */ 51 52 #endif /* _ASM_RISCV_VDSO_H */ 53