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| author | Al Viro <viro@zeniv.linux.org.uk> | 2008-08-17 21:05:42 -0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@zytor.com> | 2008-10-22 22:55:20 -0700 |
| commit | bb8985586b7a906e116db835c64773b7a7d51663 (patch) | |
| tree | de93ae58e88cc563d95cc124a73f3930594c6100 /arch/x86/include/asm/vdso.h | |
| parent | 8ede0bdb63305d3353efd97e9af6210afb05734e (diff) | |
| download | lwn-bb8985586b7a906e116db835c64773b7a7d51663.tar.gz lwn-bb8985586b7a906e116db835c64773b7a7d51663.zip | |
x86, um: ... and asm-x86 move
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Diffstat (limited to 'arch/x86/include/asm/vdso.h')
| -rw-r--r-- | arch/x86/include/asm/vdso.h | 47 |
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 @@ +#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 */ |