d603c8e184
Cc: Borislav Petkov <bp@alien8.de> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Brian Gerst <brgerst@gmail.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: linux-kernel@vger.kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
45 lines
1.6 KiB
ArmAsm
45 lines
1.6 KiB
ArmAsm
/*
|
|
* 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/version.h>
|
|
#include <linux/elfnote.h>
|
|
|
|
/* Ideally this would use UTS_NAME, but using a quoted string here
|
|
doesn't work. Remember to change this when changing the
|
|
kernel's name. */
|
|
ELFNOTE_START(Linux, 0, "a")
|
|
.long LINUX_VERSION_CODE
|
|
ELFNOTE_END
|
|
|
|
#ifdef CONFIG_XEN
|
|
/*
|
|
* Add a special note telling glibc's dynamic linker a fake hardware
|
|
* flavor that it will use to choose the search path for libraries in the
|
|
* same way it uses real hardware capabilities like "mmx".
|
|
* We supply "nosegneg" as the fake capability, to indicate that we
|
|
* do not like negative offsets in instructions using segment overrides,
|
|
* since we implement those inefficiently. This makes it possible to
|
|
* install libraries optimized to avoid those access patterns in someplace
|
|
* like /lib/i686/tls/nosegneg. Note that an /etc/ld.so.conf.d/file
|
|
* corresponding to the bits here is needed to make ldconfig work right.
|
|
* It should contain:
|
|
* hwcap 1 nosegneg
|
|
* to match the mapping of bit to name that we give here.
|
|
*
|
|
* At runtime, the fake hardware feature will be considered to be present
|
|
* if its bit is set in the mask word. So, we start with the mask 0, and
|
|
* at boot time we set VDSO_NOTE_NONEGSEG_BIT if running under Xen.
|
|
*/
|
|
|
|
#include "../../xen/vdso.h" /* Defines VDSO_NOTE_NONEGSEG_BIT. */
|
|
|
|
ELFNOTE_START(GNU, 2, "a")
|
|
.long 1 /* ncaps */
|
|
VDSO32_NOTE_MASK: /* Symbol used by arch/x86/xen/setup.c */
|
|
.long 0 /* mask */
|
|
.byte VDSO_NOTE_NONEGSEG_BIT; .asciz "nosegneg" /* bit, name */
|
|
ELFNOTE_END
|
|
#endif
|