about summary refs log tree commit diff
path: root/sysdeps/unix/sysv/linux/mips/Makefile
diff options
context:
space:
mode:
authorMatthew Fortune <matthew.fortune@imgtec.com>2016-04-12 09:31:06 +0100
committerMatthew Fortune <matthew.fortune@imgtec.com>2016-04-12 11:05:13 +0100
commitb39d84adff832bddc3e2fc4a1878a7fba6bbb2a1 (patch)
treee0c8e80c56e73097a75f824e16671a570b195ac4 /sysdeps/unix/sysv/linux/mips/Makefile
parent071af4769fcdfe2cd349157b01f27c9571478ace (diff)
downloadglibc-b39d84adff832bddc3e2fc4a1878a7fba6bbb2a1.tar.gz
glibc-b39d84adff832bddc3e2fc4a1878a7fba6bbb2a1.tar.xz
glibc-b39d84adff832bddc3e2fc4a1878a7fba6bbb2a1.zip
VDSO support for MIPS
This patch adds support for using the implementations of gettimeofday()
and clock_gettime() provided by the kernel in the VDSO. The VDSO will
always provide clock_gettime() as CLOCK_{REALTIME,MONOTONIC}_COARSE can
be implemented regardless of platform. CLOCK_{REALTIME,MONOTONIC}, along
with gettimeofday(), are only implemented on platforms which make use of
either the CP0 count or GIC as their clocksource. On other platforms,
the VDSO does not provide the __vdso_gettimeofday symbol, as it is
never useful.

The VDSO functions return ENOSYS when they encounter an unsupported
request, in which case glibc should fall back to the standard syscall.

Tested with upstream kernel 4.5 and QEMU emulating Malta.

./vdsotest gettimeofday bench
gettimeofday: syscall: 1021 nsec/call
gettimeofday:    libc: 262 nsec/call
gettimeofday:    vdso: 174 nsec/call

	* sysdeps/unix/sysv/linux/mips/Makefile (sysdep_routines):
	Include dl-vdso.
	* sysdeps/unix/sysv/linux/mips/Versions: Add
	__vdso_clock_gettime.
	* sysdeps/unix/sysv/linux/mips/init-first.c: New file.
	* sysdeps/unix/sysv/linux/mips/libc-vdso.h: New file.
	* sysdeps/unix/sysv/linux/mips/mips32/sysdep.h:
	(INTERNAL_VSYSCALL_CALL): Define to be compatible with MIPS
	definitions of INTERNAL_SYSCALL_{ERROR_P,ERRNO}.
	(HAVE_CLOCK_GETTIME_VSYSCALL): Define.
	(HAVE_GETTIMEOFDAY_VSYSCALL): Define.
	* sysdeps/unix/sysv/linux/mips/mips64/n32/sysdep.h: Likewise.
	* sysdeps/unix/sysv/linux/mips/mips64/n64/sysdep.h: Likewise.
Diffstat (limited to 'sysdeps/unix/sysv/linux/mips/Makefile')
-rw-r--r--sysdeps/unix/sysv/linux/mips/Makefile2
1 files changed, 2 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/mips/Makefile b/sysdeps/unix/sysv/linux/mips/Makefile
index 8127025503..c6729c15f9 100644
--- a/sysdeps/unix/sysv/linux/mips/Makefile
+++ b/sysdeps/unix/sysv/linux/mips/Makefile
@@ -96,6 +96,8 @@ ifeq ($(subdir),elf)
 ifeq ($(build-shared),yes)
 # This is needed for DSO loading from static binaries.
 sysdep-dl-routines += dl-static
+
+sysdep_routines += dl-vdso
 endif
 endif