commit 10726d52ac3a7b34a6e2d9c40532037ca1108485
author Robert Jarzmik <robert.jarzmik@intel.com> Wed Jul 15 15:26:43 2015 +0200
committer Mingwei Shi <mingwei.shi@intel.com> Wed Jul 22 01:31:38 2015 +0000
tree 49c3613ab638c4f7f322d4ad5d95dfbbd7b82fd2
parent 3bcfd47c6836a952b2093c64feb9f1e382891256

libc: arch-x86: implement kernel vdso time functions

This patch give the possibility of time vdso support on 32bit kernel.
If the 32bit x86 kernel provides gettimeofday() and clock_gettime()
primitives in vdso. In this case make bionic use them. If the kernel
doesn't provide them, fallback to the legacy system call versions.

Change-Id: I87b772a9486fa356903e1f98f486ab9eb0b6f6f7
Signed-off-by: Robert Jarzmik <robert.jarzmik@intel.com>
Signed-off-by: Mingwei Shi <mingwei.shi@intel.com>

libc/bionic/vdso.cpp

diff --git a/libc/bionic/vdso.cpp b/libc/bionic/vdso.cpp
index b55c57f..9eae3d5 100644
--- a/libc/bionic/vdso.cpp
+++ b/libc/bionic/vdso.cpp
@@ -19,13 +19,12 @@
 #include <sys/auxv.h>
 #include <unistd.h>
 
-// x86 has a vdso, but there's nothing useful to us in it.
-#if defined(__aarch64__) || defined(__x86_64__)
+#if defined(__aarch64__) || defined(__x86_64__) || defined (__i386__)
 
 #if defined(__aarch64__)
 #define VDSO_CLOCK_GETTIME_SYMBOL "__kernel_clock_gettime"
 #define VDSO_GETTIMEOFDAY_SYMBOL  "__kernel_gettimeofday"
-#elif defined(__x86_64__)
+#elif defined(__x86_64__) || defined(__i386__)
 #define VDSO_CLOCK_GETTIME_SYMBOL "__vdso_clock_gettime"
 #define VDSO_GETTIMEOFDAY_SYMBOL  "__vdso_gettimeofday"
 #endif