From 4a556f4f56da3110b27e265b79f0e7582115445c Mon Sep 17 00:00:00 2001 From: Chris Metcalf Date: Wed, 7 Aug 2013 15:33:32 -0400 Subject: 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 --- arch/tile/include/asm/processor.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'arch/tile/include/asm/processor.h') 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 -- cgit