Re: [RFC PATCH v2 01/10] elf: Add relocation types used by nolibc

[Thomas Weißschuh]

On 2026-02-04 21:45:33+0900, Daniel Palmer wrote:
> nolibc based programs are gaining the ability to relocate themselves
> so that they can support PIE without needing a linker or special
> crt from the toolchain.
> 
> Add the required relocation types.

For the final version of this patch the UAPI headers will need all
relocation types for all architectures. Otherwise the kernel build will break.
I can do this migration, as I'll need it for some other things anyways.

Could you add a comment to this effect to the patch?

> 
> Signed-off-by: Daniel Palmer <daniel@xxxxxxxxx>
> ---
>  include/uapi/linux/elf-r.h | 27 +++++++++++++++++++++++++++
>  include/uapi/linux/elf.h   |  1 +
>  2 files changed, 28 insertions(+)
>  create mode 100644 include/uapi/linux/elf-r.h
> 
> diff --git a/include/uapi/linux/elf-r.h b/include/uapi/linux/elf-r.h
> new file mode 100644
> index 000000000000..a1dce23104a7
> --- /dev/null
> +++ b/include/uapi/linux/elf-r.h
> @@ -0,0 +1,27 @@
> +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> +#ifndef _LINUX_ELF_R_H
> +#define _LINUX_ELF_R_H
> +
> +/* These constants define various ELF relocation types */
> +#define R_386_RELATIVE		8
> +
> +#define R_68K_RELATIVE		22
> +
> +#define R_AARCH64_RELATIVE	1027
> +
> +#define R_AMD64_RELATIVE	8
> +
> +#define R_ARM_RELATIVE		23
> +
> +#define R_LARCH_RELATIVE	3
> +
> +#define R_PPC_RELATIVE		22
> +
> +#define R_RISCV_RELATIVE	3
> +
> +#define R_SH_RELATIVE		165
> +
> +#define R_SPARC_NONE		0
> +#define R_SPARC_RELATIVE	22
> +
> +#endif /* _LINUX_ELF_R_H */
> diff --git a/include/uapi/linux/elf.h b/include/uapi/linux/elf.h
> index 819ded2d39de..3d18543d5460 100644
> --- a/include/uapi/linux/elf.h
> +++ b/include/uapi/linux/elf.h
> @@ -4,6 +4,7 @@
>  
>  #include <linux/types.h>
>  #include <linux/elf-em.h>
> +#include <linux/elf-r.h>
>  
>  /* 32-bit ELF base types. */
>  typedef __u32	Elf32_Addr;