1 #ifndef _ASM_X86_VDSO_H 2 #define _ASM_X86_VDSO_H 3 4 #if defined CONFIG_X86_32 || defined CONFIG_COMPAT 5 extern const char VDSO32_PRELINK[]; 6 7 /* 8 * Given a pointer to the vDSO image, find the pointer to VDSO32_name 9 * as that symbol is defined in the vDSO sources or linker script. 10 */ 11 #define VDSO32_SYMBOL(base, name) \ 12 ({ \ 13 extern const char VDSO32_##name[]; \ 14 (void __user *)(VDSO32_##name - VDSO32_PRELINK + \ 15 (unsigned long)(base)); \ 16 }) 17 #endif 18 19 /* 20 * These symbols are defined with the addresses in the vsyscall page. 21 * See vsyscall-sigreturn.S. 22 */ 23 extern void __user __kernel_sigreturn; 24 extern void __user __kernel_rt_sigreturn; 25 26 /* 27 * These symbols are defined by vdso32.S to mark the bounds 28 * of the ELF DSO images included therein. 29 */ 30 extern const char vdso32_int80_start, vdso32_int80_end; 31 extern const char vdso32_syscall_start, vdso32_syscall_end; 32 extern const char vdso32_sysenter_start, vdso32_sysenter_end; 33 34 #endif /* _ASM_X86_VDSO_H */ 35