b0b49f2673
The compat vDSO is a complicated hack that's needed to maintain compatibility with a small range of glibc versions. This removes it and replaces it with a much simpler hack: a config option to disable the 32-bit vDSO by default. This also changes the default value of CONFIG_COMPAT_VDSO to n -- users configuring kernels from scratch almost certainly want that choice. Signed-off-by: Andy Lutomirski <luto@amacapital.net> Link: http://lkml.kernel.org/r/4bb4690899106eb11430b1186d5cc66ca9d1660c.1394751608.git.luto@amacapital.net Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
32 lines
915 B
C
32 lines
915 B
C
#ifndef _ASM_X86_VDSO_H
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#define _ASM_X86_VDSO_H
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#if defined CONFIG_X86_32 || defined CONFIG_COMPAT
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/*
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* Given a pointer to the vDSO image, find the pointer to VDSO32_name
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* as that symbol is defined in the vDSO sources or linker script.
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*/
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#define VDSO32_SYMBOL(base, name) \
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({ \
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extern const char VDSO32_##name[]; \
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(void __user *)(VDSO32_##name + (unsigned long)(base)); \
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})
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#endif
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/*
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* These symbols are defined with the addresses in the vsyscall page.
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* See vsyscall-sigreturn.S.
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*/
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extern void __user __kernel_sigreturn;
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extern void __user __kernel_rt_sigreturn;
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/*
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* These symbols are defined by vdso32.S to mark the bounds
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* of the ELF DSO images included therein.
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*/
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extern const char vdso32_int80_start, vdso32_int80_end;
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extern const char vdso32_syscall_start, vdso32_syscall_end;
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extern const char vdso32_sysenter_start, vdso32_sysenter_end;
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#endif /* _ASM_X86_VDSO_H */
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