1/* 2 * This supplies .note.* sections to go into the PT_NOTE inside the vDSO text. 3 * Here we can supply some information useful to userland. 4 */ 5 6#include <linux/version.h> 7#include <linux/elfnote.h> 8 9/* Ideally this would use UTS_NAME, but using a quoted string here 10 doesn't work. Remember to change this when changing the 11 kernel's name. */ 12ELFNOTE_START(Linux, 0, "a") 13 .long LINUX_VERSION_CODE 14ELFNOTE_END 15 16#ifdef CONFIG_XEN 17/* 18 * Add a special note telling glibc's dynamic linker a fake hardware 19 * flavor that it will use to choose the search path for libraries in the 20 * same way it uses real hardware capabilities like "mmx". 21 * We supply "nosegneg" as the fake capability, to indicate that we 22 * do not like negative offsets in instructions using segment overrides, 23 * since we implement those inefficiently. This makes it possible to 24 * install libraries optimized to avoid those access patterns in someplace 25 * like /lib/i686/tls/nosegneg. Note that an /etc/ld.so.conf.d/file 26 * corresponding to the bits here is needed to make ldconfig work right. 27 * It should contain: 28 * hwcap 1 nosegneg 29 * to match the mapping of bit to name that we give here. 30 * 31 * At runtime, the fake hardware feature will be considered to be present 32 * if its bit is set in the mask word. So, we start with the mask 0, and 33 * at boot time we set VDSO_NOTE_NONEGSEG_BIT if running under Xen. 34 */ 35 36#include "../../xen/vdso.h" /* Defines VDSO_NOTE_NONEGSEG_BIT. */ 37 38ELFNOTE_START(GNU, 2, "a") 39 .long 1 /* ncaps */ 40VDSO32_NOTE_MASK: /* Symbol used by arch/x86/xen/setup.c */ 41 .long 0 /* mask */ 42 .byte VDSO_NOTE_NONEGSEG_BIT; .asciz "nosegneg" /* bit, name */ 43ELFNOTE_END 44#endif 45