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-rw-r--r--arch/x86/include/asm/vdso.h47
1 files changed, 47 insertions, 0 deletions
diff --git a/arch/x86/include/asm/vdso.h b/arch/x86/include/asm/vdso.h
new file mode 100644
index 000000000000..4ab320913ea3
--- /dev/null
+++ b/arch/x86/include/asm/vdso.h
@@ -0,0 +1,47 @@
1#ifndef ASM_X86__VDSO_H
2#define ASM_X86__VDSO_H
3
4#ifdef CONFIG_X86_64
5extern 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
19extern 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 */
36extern void __user __kernel_sigreturn;
37extern 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 */
43extern const char vdso32_int80_start, vdso32_int80_end;
44extern const char vdso32_syscall_start, vdso32_syscall_end;
45extern const char vdso32_sysenter_start, vdso32_sysenter_end;
46
47#endif /* ASM_X86__VDSO_H */