mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-23 12:43:55 +08:00
3ff6eecca4
Remove the deprecated __attribute_used__. [Introduce __section in a few places to silence checkpatch /sam] Signed-off-by: Adrian Bunk <bunk@kernel.org> Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
99 lines
3.5 KiB
C
99 lines
3.5 KiB
C
#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:
|
|
|
|
#define ELFNOTE_END \
|
|
4484:.balign 4 ; \
|
|
.popsection ;
|
|
|
|
#define ELFNOTE(name, type, desc) \
|
|
ELFNOTE_START(name, type, "") \
|
|
desc ; \
|
|
ELFNOTE_END
|
|
|
|
#else /* !__ASSEMBLER__ */
|
|
#include <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) \
|
|
static const struct { \
|
|
struct elf##size##_note _nhdr; \
|
|
unsigned char _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)
|
|
|
|
#define ELFNOTE32(name, type, desc) ELFNOTE(32, name, type, desc)
|
|
#define ELFNOTE64(name, type, desc) ELFNOTE(64, name, type, desc)
|
|
#endif /* __ASSEMBLER__ */
|
|
|
|
#endif /* _LINUX_ELFNOTE_H */
|