summaryrefslogtreecommitdiffstats
path: root/arch/x86/include/asm/vdso.h
blob: 9064052b73ded033f961c2756a981ad1789678f0 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
#ifndef _ASM_X86_VDSO_H
#define _ASM_X86_VDSO_H

#ifdef CONFIG_X86_64
extern const char VDSO64_PRELINK[];

/*
 * Given a pointer to the vDSO image, find the pointer to VDSO64_name
 * as that symbol is defined in the vDSO sources or linker script.
 */
#define VDSO64_SYMBOL(base, name)					\
({									\
	extern const char VDSO64_##name[];				\
	(void *)(VDSO64_##name - VDSO64_PRELINK + (unsigned long)(base)); \
})
#endif

#if defined CONFIG_X86_32 || defined CONFIG_COMPAT
extern const char VDSO32_PRELINK[];

/*
 * Given a pointer to the vDSO image, find the pointer to VDSO32_name
 * as that symbol is defined in the vDSO sources or linker script.
 */
#define VDSO32_SYMBOL(base, name)					\
({									\
	extern const char VDSO32_##name[];				\
	(void *)(VDSO32_##name - VDSO32_PRELINK + (unsigned long)(base)); \
})
#endif

/*
 * These symbols are defined with the addresses in the vsyscall page.
 * See vsyscall-sigreturn.S.
 */
extern void __user __kernel_sigreturn;
extern void __user __kernel_rt_sigreturn;

/*
 * These symbols are defined by vdso32.S to mark the bounds
 * of the ELF DSO images included therein.
 */
extern const char vdso32_int80_start, vdso32_int80_end;
extern const char vdso32_syscall_start, vdso32_syscall_end;
extern const char vdso32_sysenter_start, vdso32_sysenter_end;

#endif /* _ASM_X86_VDSO_H */
OpenPOWER on IntegriCloud