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authorChris Metcalf <cmetcalf@tilera.com>2013-08-07 15:33:32 -0400
committerChris Metcalf <cmetcalf@tilera.com>2013-08-13 16:26:21 -0400
commit4a556f4f56da3110b27e265b79f0e7582115445c (patch)
treef5af0b865c867160855e4722b49d7e850dddf944 /arch/tile/kernel/signal.c
parent0c1d1917c547c8e787fb58e20e2de577453c980c (diff)
downloadop-kernel-dev-4a556f4f56da3110b27e265b79f0e7582115445c.zip
op-kernel-dev-4a556f4f56da3110b27e265b79f0e7582115445c.tar.gz
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/kernel/signal.c')
-rw-r--r--arch/tile/kernel/signal.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/tile/kernel/signal.c b/arch/tile/kernel/signal.c
index 9531845b..2d1dbf3 100644
--- a/arch/tile/kernel/signal.c
+++ b/arch/tile/kernel/signal.c
@@ -33,6 +33,7 @@
#include <asm/ucontext.h>
#include <asm/sigframe.h>
#include <asm/syscalls.h>
+#include <asm/vdso.h>
#include <arch/interrupts.h>
#define DEBUG_SIG 0
@@ -190,7 +191,7 @@ static int setup_rt_frame(int sig, struct k_sigaction *ka, siginfo_t *info,
if (err)
goto give_sigsegv;
- restorer = VDSO_BASE;
+ restorer = VDSO_SYM(&__vdso_rt_sigreturn);
if (ka->sa.sa_flags & SA_RESTORER)
restorer = (unsigned long) ka->sa.sa_restorer;
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