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| author |   Jeremy Fitzhardinge <jeremy@goop.org> | 2008-07-12 02:22:00 -0700 |
|---|---|---|
| committer |   Ingo Molnar <mingo@elte.hu> | 2008-07-16 11:08:27 +0200 |
| commit | 6a52e4b1cddd90fbfde8fb67021657936ee74b07 (patch) | |
| tree | c876e1fafe89169f373f6b04739242b5d646fcf7 /include | |
| parent | x86, xen, vdso: fix build error (diff) | |
| download | linux-dev-6a52e4b1cddd90fbfde8fb67021657936ee74b07.tar.xz linux-dev-6a52e4b1cddd90fbfde8fb67021657936ee74b07.zip | |
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')
| -rw-r--r-- | include/asm-x86/vdso.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/include/asm-x86/vdso.h b/include/asm-x86/vdso.h index 86e085e003d2..8e18fb80f5e6 100644 --- a/include/asm-x86/vdso.h +++ b/include/asm-x86/vdso.h @@ -36,4 +36,12 @@ extern const char VDSO32_PRELINK[]; 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 */ |