diff options
| author | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-07 23:33:32 +0400 |
|---|---|---|
| committer | Chris Metcalf <cmetcalf@tilera.com> | 2013-08-14 00:26:21 +0400 |
| commit | 4a556f4f56da3110b27e265b79f0e7582115445c (patch) | |
| tree | f5af0b865c867160855e4722b49d7e850dddf944 /arch/tile/include/asm/processor.h | |
| parent | 0c1d1917c547c8e787fb58e20e2de577453c980c (diff) | |
| download | linux-4a556f4f56da3110b27e265b79f0e7582115445c.tar.xz | |
tile: implement gettimeofday() via vDSO
This change creates the framework for vDSO calls, makes the existing
rt_sigreturn() mechanism use it, and adds a fast gettimeofday().
Now that we need to expose the vDSO address to userspace, we add
AT_SYSINFO_EHDR to the set of aux entries provided to userspace.
(You can disable any extra vDSO support by booting with vdso=0,
but the rt_sigreturn vDSO page will still be provided.)
Note that glibc has supported the tile vDSO since release 2.17.
Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Diffstat (limited to 'arch/tile/include/asm/processor.h')
| -rw-r--r-- | arch/tile/include/asm/processor.h | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/tile/include/asm/processor.h b/arch/tile/include/asm/processor.h index fed1c044fec8..461322b473b5 100644 --- a/arch/tile/include/asm/processor.h +++ b/arch/tile/include/asm/processor.h @@ -180,10 +180,10 @@ struct thread_struct { #define TASK_SIZE TASK_SIZE_MAX #endif -/* We provide a minimal "vdso" a la x86; just the sigreturn code for now. */ -#define VDSO_BASE (TASK_SIZE - PAGE_SIZE) +#define VDSO_BASE ((unsigned long)current->active_mm->context.vdso_base) +#define VDSO_SYM(x) (VDSO_BASE + (unsigned long)(x)) -#define STACK_TOP VDSO_BASE +#define STACK_TOP TASK_SIZE /* STACK_TOP_MAX is used temporarily in execve and should not check COMPAT. */ #define STACK_TOP_MAX TASK_SIZE_MAX |