/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_ELFNOTE_H #define _LINUX_ELFNOTE_H /* * Helper macros to generate ELF Note structures, which are put into a * PT_NOTE segment of the final vmlinux image. These are useful for * including name-value pairs of metadata into the kernel binary (or * modules?) for use by external programs. * * Each note has three parts: a name, a type and a desc. The name is * intended to distinguish the note's originator, so it would be a * company, project, subsystem, etc; it must be in a suitable form for * use in a section name. The type is an integer which is used to tag * the data, and is considered to be within the "name" namespace (so * "FooCo"'s type 42 is distinct from "BarProj"'s type 42). The * "desc" field is the actual data. There are no constraints on the * desc field's contents, though typically they're fairly small. * * All notes from a given NAME are put into a section named * .note.NAME. When the kernel image is finally linked, all the notes * are packed into a single .notes section, which is mapped into the * PT_NOTE segment. Because notes for a given name are grouped into * the same section, they'll all be adjacent the output file. * * This file defines macros for both C and assembler use. Their * syntax is slightly different, but they're semantically similar. * * See the ELF specification for more detail about ELF notes.
*/
#ifdef __ASSEMBLER__ /* * Generate a structure with the same shape as Elf{32,64}_Nhdr (which * turn out to be the same size and shape), followed by the name and * desc data with appropriate padding. The 'desctype' argument is the * assembler pseudo op defining the type of the data e.g. .asciz while * 'descdata' is the data itself e.g. "hello, world". * * e.g. ELFNOTE(XYZCo, 42, .asciz, "forty-two") * ELFNOTE(XYZCo, 12, .long, 0xdeadbeef)
*/ #define ELFNOTE_START(name, type, flags) \
.pushsection .note.name, flags,@note ; \
.balign 4 ; \
.long 2f - 1f /* namesz */ ; \
.long 4484f - 3f /* descsz */ ; \
.long type ; \
1:.asciz #name ; \
2:.balign 4 ; \
3:
#else/* !__ASSEMBLER__ */ #include <uapi/linux/elf.h> /* * Use an anonymous structure which matches the shape of * Elf{32,64}_Nhdr, but includes the name and desc data. The size and * type of name and desc depend on the macro arguments. "name" must * be a literal string, and "desc" must be passed by value. You may * only define one note per line, since __LINE__ is used to generate * unique symbols.
*/ #define _ELFNOTE_PASTE(a,b) a##b #define _ELFNOTE(size, name, unique, type, desc) \ staticconststruct { \ struct elf##size##_note _nhdr; \ unsignedchar _name[sizeof(name)] \
__attribute__((aligned(sizeof(Elf##size##_Word)))); \
typeof(desc) _desc \
__attribute__((aligned(sizeof(Elf##size##_Word)))); \
} _ELFNOTE_PASTE(_note_, unique) \
__used \
__attribute__((section(".note." name), \
aligned(sizeof(Elf##size##_Word)), \
unused)) = { \
{ \ sizeof(name), \ sizeof(desc), \
type, \
}, \
name, \
desc \
} #define ELFNOTE(size, name, type, desc) \
_ELFNOTE(size, name, __LINE__, type, desc)
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