49 lines
1.7 KiB
ArmAsm
49 lines
1.7 KiB
ArmAsm
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* This supplies .note.* sections to go into the PT_NOTE inside the vDSO text.
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* Here we can supply some information useful to userland.
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*/
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#include <linux/build-salt.h>
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#include <linux/version.h>
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#include <linux/elfnote.h>
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/* Ideally this would use UTS_NAME, but using a quoted string here
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doesn't work. Remember to change this when changing the
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kernel's name. */
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ELFNOTE_START(Linux, 0, "a")
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.long LINUX_VERSION_CODE
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ELFNOTE_END
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BUILD_SALT
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#ifdef CONFIG_XEN
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/*
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* Add a special note telling glibc's dynamic linker a fake hardware
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* flavor that it will use to choose the search path for libraries in the
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* same way it uses real hardware capabilities like "mmx".
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* We supply "nosegneg" as the fake capability, to indicate that we
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* do not like negative offsets in instructions using segment overrides,
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* since we implement those inefficiently. This makes it possible to
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* install libraries optimized to avoid those access patterns in someplace
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* like /lib/i686/tls/nosegneg. Note that an /etc/ld.so.conf.d/file
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* corresponding to the bits here is needed to make ldconfig work right.
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* It should contain:
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* hwcap 1 nosegneg
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* to match the mapping of bit to name that we give here.
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*
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* At runtime, the fake hardware feature will be considered to be present
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* if its bit is set in the mask word. So, we start with the mask 0, and
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* at boot time we set VDSO_NOTE_NONEGSEG_BIT if running under Xen.
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*/
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#include "../../xen/vdso.h" /* Defines VDSO_NOTE_NONEGSEG_BIT. */
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ELFNOTE_START(GNU, 2, "a")
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.long 1 /* ncaps */
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VDSO32_NOTE_MASK: /* Symbol used by arch/x86/xen/setup.c */
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.long 0 /* mask */
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.byte VDSO_NOTE_NONEGSEG_BIT; .asciz "nosegneg" /* bit, name */
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ELFNOTE_END
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#endif
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