diff options
| author | Roland McGrath <roland@redhat.com> | 2008-01-30 13:30:43 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-01-30 13:30:43 +0100 |
| commit | 36197c92a20c142fc2a068e0366053d770fa0096 (patch) | |
| tree | 796f377cadc86bb9cad36090698f6bbaec0ca0f1 /include | |
| parent | 0aa97fb22624f18e5925d702ab0364d3838cfd91 (diff) | |
x86 vDSO: ia32 sysenter_return
This changes the 64-bit kernel's support for the 32-bit sysenter
instruction to use stored fields rather than constants for the
user-mode return address, as the 32-bit kernel does. This adds a
sysenter_return field to struct thread_info, as 32-bit has. There
is no observable effect from this yet. It makes the assembly code
independent of the 32-bit vDSO mapping address, paving the way for
making the vDSO address vary as it does on the 32-bit kernel.
[ akpm@linux-foundation.org: build fix on !CONFIG_IA32_EMULATION ]
Signed-off-by: Roland McGrath <roland@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-x86/thread_info_64.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-x86/thread_info_64.h b/include/asm-x86/thread_info_64.h index 1ac23c157231..c8e7736fc792 100644 --- a/include/asm-x86/thread_info_64.h +++ b/include/asm-x86/thread_info_64.h @@ -33,6 +33,9 @@ struct thread_info { mm_segment_t addr_limit; struct restart_block restart_block; +#ifdef CONFIG_IA32_EMULATION + void __user *sysenter_return; +#endif }; #endif |