1 #ifndef _ASM_X86_VDSO_H

     2 #define _ASM_X86_VDSO_H

     3 

     4 #ifdef CONFIG_X86_64

     5 extern const char VDSO64_PRELINK[];

     6 

     7 /*

     8  * Given a pointer to the vDSO image, find the pointer to VDSO64_name

     9  * as that symbol is defined in the vDSO sources or linker script.

    10  */

    11 #define VDSO64_SYMBOL(base, name)					\

    12 ({									\

    13 	extern const char VDSO64_##name[];				\

    14 	(void *)(VDSO64_##name - VDSO64_PRELINK + (unsigned long)(base)); \

    15 })

    16 #endif

    17 

    18 #if defined CONFIG_X86_32 || defined CONFIG_COMPAT

    19 extern const char VDSO32_PRELINK[];

    20 

    21 /*

    22  * Given a pointer to the vDSO image, find the pointer to VDSO32_name

    23  * as that symbol is defined in the vDSO sources or linker script.

    24  */

    25 #define VDSO32_SYMBOL(base, name)					\

    26 ({									\

    27 	extern const char VDSO32_##name[];				\

    28 	(void *)(VDSO32_##name - VDSO32_PRELINK + (unsigned long)(base)); \

    29 })

    30 #endif

    31 

    32 /*

    33  * These symbols are defined with the addresses in the vsyscall page.

    34  * See vsyscall-sigreturn.S.

    35  */

    36 extern void __user __kernel_sigreturn;

    37 extern void __user __kernel_rt_sigreturn;

    38 

    39 /*

    40  * These symbols are defined by vdso32.S to mark the bounds

    41  * of the ELF DSO images included therein.

    42  */

    43 extern const char vdso32_int80_start, vdso32_int80_end;

    44 extern const char vdso32_syscall_start, vdso32_syscall_end;

    45 extern const char vdso32_sysenter_start, vdso32_sysenter_end;

    46 

    47 #endif /* _ASM_X86_VDSO_H */