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| author | Andy Lutomirski <luto@amacapital.net> | 2015-03-05 19:19:04 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2015-03-06 08:32:58 +0100 |
| commit | 9d0c914c60f4d3123debb653340dc1f7cf44939d (patch) | |
| tree | 41cd00a5332551608057bd6a08d1724a081971f5 /arch/x86/kernel | |
| parent | 75182b1632a89f12540baa1806a7c5c180db620c (diff) | |
| download | linux-9d0c914c60f4d3123debb653340dc1f7cf44939d.tar.bz2 | |
x86/asm/entry/64/compat: Change the 32-bit sysenter code to use sp0
The ia32 sysenter code loaded the top of the kernel stack into
rsp by loading kernel_stack and then adjusting it. It can be
simplified to just read sp0 directly.
This requires the addition of a new asm-offsets entry for sp0.
Signed-off-by: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/88ff9006163d296a0665338585c36d9bfb85235d.1425611534.git.luto@amacapital.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel')
| -rw-r--r-- | arch/x86/kernel/asm-offsets_64.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/x86/kernel/asm-offsets_64.c b/arch/x86/kernel/asm-offsets_64.c index fdcbb4d27c9f..5ce6f2da8763 100644 --- a/arch/x86/kernel/asm-offsets_64.c +++ b/arch/x86/kernel/asm-offsets_64.c @@ -81,6 +81,7 @@ int main(void) #undef ENTRY OFFSET(TSS_ist, tss_struct, x86_tss.ist); + OFFSET(TSS_sp0, tss_struct, x86_tss.sp0); BLANK(); DEFINE(__NR_syscall_max, sizeof(syscalls_64) - 1); |