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 #ifdef CONFIG_MMU 16 17 #define __VDSO_PAGES 4 18 19 #ifndef __ASSEMBLER__ 20 #include <generated/vdso-offsets.h> 21 #ifdef CONFIG_RISCV_USER_CFI 22 #include <generated/vdso-cfi-offsets.h> 23 #endif 24 25 #ifdef CONFIG_RISCV_USER_CFI 26 #define VDSO_SYMBOL(base, name) \ 27 (riscv_has_extension_unlikely(RISCV_ISA_EXT_ZIMOP) ? \ 28 (void __user *)((unsigned long)(base) + __vdso_##name##_cfi_offset) : \ 29 (void __user *)((unsigned long)(base) + __vdso_##name##_offset)) 30 #else 31 #define VDSO_SYMBOL(base, name) \ 32 ((void __user *)((unsigned long)(base) + __vdso_##name##_offset)) 33 #endif 34 35 #ifdef CONFIG_COMPAT 36 #include <generated/compat_vdso-offsets.h> 37 38 #define COMPAT_VDSO_SYMBOL(base, name) \ 39 (void __user *)((unsigned long)(base) + compat__vdso_##name##_offset) 40 41 extern char compat_vdso_start[], compat_vdso_end[]; 42 43 #endif /* CONFIG_COMPAT */ 44 45 extern char vdso_start[], vdso_end[]; 46 extern char vdso_cfi_start[], vdso_cfi_end[]; 47 48 #endif /* !__ASSEMBLER__ */ 49 50 #endif /* CONFIG_MMU */ 51 52 #endif /* _ASM_RISCV_VDSO_H */ 53