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 /arch/x86/kernel/asm-offsets_64.c | |
| 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 'arch/x86/kernel/asm-offsets_64.c')
| -rw-r--r-- | arch/x86/kernel/asm-offsets_64.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c index 40f41752c1df..c27c646214f4 100644 --- a/arch/x86/kernel/asm-offsets_64.c +++ b/arch/x86/kernel/asm-offsets_64.c @@ -46,6 +46,9 @@ int main(void) ENTRY(addr_limit); ENTRY(preempt_count); ENTRY(status); +#ifdef CONFIG_IA32_EMULATION + ENTRY(sysenter_return); +#endif BLANK(); #undef ENTRY #define ENTRY(entry) DEFINE(pda_ ## entry, offsetof(struct x8664_pda, entry)) |