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 #else 23 extern size_t __vdso_alternatives_start_offset, __vdso_alternatives_end_offset; 24 #endif 25 26 #ifdef CONFIG_RISCV_USER_CFI 27 #include <generated/vdso-cfi-offsets.h> 28 #else 29 extern size_t __vdso_alternatives_start_cfi_offset, __vdso_alternatives_end_cfi_offset; 30 #endif 31 32 #ifdef CONFIG_RISCV_USER_CFI 33 #define VDSO_SYMBOL(base, name) \ 34 (riscv_has_extension_unlikely(RISCV_ISA_EXT_ZIMOP) ? \ 35 (void __user *)((unsigned long)(base) + __vdso_##name##_cfi_offset) : \ 36 (void __user *)((unsigned long)(base) + __vdso_##name##_offset)) 37 #else 38 #define VDSO_SYMBOL(base, name) \ 39 ((void __user *)((unsigned long)(base) + __vdso_##name##_offset)) 40 #endif 41 42 #ifdef CONFIG_COMPAT 43 #include <generated/compat_vdso-offsets.h> 44 45 #define COMPAT_VDSO_SYMBOL(base, name) \ 46 (void __user *)((unsigned long)(base) + compat__vdso_##name##_offset) 47 48 #else 49 extern size_t compat__vdso_alternatives_start_offset, compat__vdso_alternatives_end_offset; 50 #endif /* CONFIG_COMPAT */ 51 52 extern char vdso_start[], vdso_end[]; 53 extern char vdso_cfi_start[], vdso_cfi_end[]; 54 extern char compat_vdso_start[], compat_vdso_end[]; 55 56 #endif /* !__ASSEMBLER__ */ 57 58 #endif /* _ASM_RISCV_VDSO_H */ 59