diff options
Diffstat (limited to 'arch/riscv/include/asm/vdso.h')
| -rw-r--r-- | arch/riscv/include/asm/vdso.h | 41 |
1 files changed, 25 insertions, 16 deletions
diff --git a/arch/riscv/include/asm/vdso.h b/arch/riscv/include/asm/vdso.h index 7a7fce63c474..f891478829a5 100644 --- a/arch/riscv/include/asm/vdso.h +++ b/arch/riscv/include/asm/vdso.h @@ -8,25 +8,34 @@ #ifndef _ASM_RISCV_VDSO_H #define _ASM_RISCV_VDSO_H -#include <linux/types.h> - -struct vdso_data { -}; - /* - * The VDSO symbols are mapped into Linux so we can just use regular symbol - * addressing to get their offsets in userspace. The symbols are mapped at an - * offset of 0, but since the linker must support setting weak undefined - * symbols to the absolute address 0 it also happens to support other low - * addresses even when the code model suggests those low addresses would not - * otherwise be availiable. + * All systems with an MMU have a VDSO, but systems without an MMU don't + * support shared libraries and therefore don't have one. */ +#ifdef CONFIG_MMU + +#define __VVAR_PAGES 2 + +#ifndef __ASSEMBLY__ +#include <generated/vdso-offsets.h> + #define VDSO_SYMBOL(base, name) \ -({ \ - extern const char __vdso_##name[]; \ - (void __user *)((unsigned long)(base) + __vdso_##name); \ -}) + (void __user *)((unsigned long)(base) + __vdso_##name##_offset) + +#ifdef CONFIG_COMPAT +#include <generated/compat_vdso-offsets.h> + +#define COMPAT_VDSO_SYMBOL(base, name) \ + (void __user *)((unsigned long)(base) + compat__vdso_##name##_offset) + +extern char compat_vdso_start[], compat_vdso_end[]; + +#endif /* CONFIG_COMPAT */ + +extern char vdso_start[], vdso_end[]; + +#endif /* !__ASSEMBLY__ */ -asmlinkage long sys_riscv_flush_icache(uintptr_t, uintptr_t, uintptr_t); +#endif /* CONFIG_MMU */ #endif /* _ASM_RISCV_VDSO_H */ |