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authorJeremy Fitzhardinge <jeremy@goop.org>2008-07-12 05:22:00 -0400
committerIngo Molnar <mingo@elte.hu>2008-07-16 05:08:27 -0400
commit6a52e4b1cddd90fbfde8fb67021657936ee74b07 (patch)
treec876e1fafe89169f373f6b04739242b5d646fcf7 /include/asm-x86/vdso.h
parent71415c6a0877d5944d5dc3060f3b03513746158d (diff)
x86_64: further cleanup of 32-bit compat syscall mechanisms
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>
Diffstat (limited to 'include/asm-x86/vdso.h')
-rw-r--r--include/asm-x86/vdso.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/asm-x86/vdso.h b/include/asm-x86/vdso.h
index 86e085e003d..8e18fb80f5e 100644
--- a/include/asm-x86/vdso.h
+++ b/include/asm-x86/vdso.h
@@ -36,4 +36,12 @@ extern const char VDSO32_PRELINK[];
36extern void __user __kernel_sigreturn; 36extern void __user __kernel_sigreturn;
37extern void __user __kernel_rt_sigreturn; 37extern void __user __kernel_rt_sigreturn;
38 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
39#endif /* asm-x86/vdso.h */ 47#endif /* asm-x86/vdso.h */