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AMD only supports "syscall" from 32-bit compat usermode. Intel and Centaur(?) only support "sysenter" from 32-bit compat usermode. Set the X86 feature bits accordingly, and set up the vdso in accordance with those bits. On the offchance we run on in a 64-bit environment which supports neither syscall nor sysenter from 32-bit mode, then fall back to the int $0x80 vdso. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
47 lines
1.3 KiB
C
47 lines
1.3 KiB
C
#ifndef _ASM_X86_VDSO_H
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#define _ASM_X86_VDSO_H 1
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#ifdef CONFIG_X86_64
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extern const char VDSO64_PRELINK[];
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/*
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* Given a pointer to the vDSO image, find the pointer to VDSO64_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 VDSO64_SYMBOL(base, name) \
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({ \
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extern const char VDSO64_##name[]; \
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(void *)(VDSO64_##name - VDSO64_PRELINK + (unsigned long)(base)); \
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})
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#endif
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#if defined CONFIG_X86_32 || defined CONFIG_COMPAT
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extern const char VDSO32_PRELINK[];
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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 *)(VDSO32_##name - VDSO32_PRELINK + (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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