diff options
| author | Richard Weinberger <richard@nod.at> | 2011-07-26 04:12:54 +0400 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-07-26 07:57:13 +0400 |
| commit | f1c2bb8b9964ed31de988910f8b1cfb586d30091 (patch) | |
| tree | ccf58acd47dbf659dca3087b7ebf2704ffd14aba /arch/um/sys-x86_64/vdso/vdso-note.S | |
| parent | fc9a00187ba1300a0baae8e613cc62598e1a7de7 (diff) | |
| download | linux-f1c2bb8b9964ed31de988910f8b1cfb586d30091.tar.xz | |
um: implement a x86_64 vDSO
Until now UML had no x86_64 vDSO. So glibc always used the vsyscall page
for gettimeday() and friends. Calls to gettimeday() returned falsely the
host time and confused some programs.
This patch adds a vDSO which turns all __vdso_* calls into a system call
so that UML can trap them.
As glibc still uses the vsyscall page for static binaries this patch
improves the situation only for dynamic binaries.
Signed-off-by: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'arch/um/sys-x86_64/vdso/vdso-note.S')
| -rw-r--r-- | arch/um/sys-x86_64/vdso/vdso-note.S | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/arch/um/sys-x86_64/vdso/vdso-note.S b/arch/um/sys-x86_64/vdso/vdso-note.S new file mode 100644 index 000000000000..79a071e4357e --- /dev/null +++ b/arch/um/sys-x86_64/vdso/vdso-note.S @@ -0,0 +1,12 @@ +/* + * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text. + * Here we can supply some information useful to userland. + */ + +#include <linux/uts.h> +#include <linux/version.h> +#include <linux/elfnote.h> + +ELFNOTE_START(Linux, 0, "a") + .long LINUX_VERSION_CODE +ELFNOTE_END |