| /* SPDX-License-Identifier: GPL-2.0 */ |
| /* |
| * 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/build-salt.h> |
| #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 |
| |
| BUILD_SALT |
| |
| #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 |
