Re: [PATCH v11 1/7] elf: Define DT_RELR related macros and types

[Fangrui Song <maskray@google.com>]

On 2022-04-22, H.J. Lu wrote:
>---
> elf/elf.h           | 13 +++++++++++--
> scripts/glibcelf.py |  4 ++++
> 2 files changed, 15 insertions(+), 2 deletions(-)
>
>diff --git a/elf/elf.h b/elf/elf.h
>index 0735f6b579..0195029188 100644
>--- a/elf/elf.h
>+++ b/elf/elf.h
>@@ -443,7 +443,8 @@ typedef struct
> #define SHT_PREINIT_ARRAY 16		/* Array of pre-constructors */
> #define SHT_GROUP	  17		/* Section group */
> #define SHT_SYMTAB_SHNDX  18		/* Extended section indices */
>-#define	SHT_NUM		  19		/* Number of defined types.  */
>+#define SHT_RELR	  19            /* RELR relative relocations */
>+#define	SHT_NUM		  20		/* Number of defined types.  */
> #define SHT_LOOS	  0x60000000	/* Start OS-specific.  */
> #define SHT_GNU_ATTRIBUTES 0x6ffffff5	/* Object attributes.  */
> #define SHT_GNU_HASH	  0x6ffffff6	/* GNU-style hash table.  */
>@@ -662,6 +663,11 @@ typedef struct
>   Elf64_Sxword	r_addend;		/* Addend */
> } Elf64_Rela;
>
>+/* RELR relocation table entry */
>+
>+typedef Elf32_Word	Elf32_Relr;
>+typedef Elf64_Xword	Elf64_Relr;
>+
> /* How to extract and insert information held in the r_info field.  */
>
> #define ELF32_R_SYM(val)		((val) >> 8)
>@@ -887,7 +893,10 @@ typedef struct
> #define DT_PREINIT_ARRAY 32		/* Array with addresses of preinit fct*/
> #define DT_PREINIT_ARRAYSZ 33		/* size in bytes of DT_PREINIT_ARRAY */
> #define DT_SYMTAB_SHNDX	34		/* Address of SYMTAB_SHNDX section */
>-#define	DT_NUM		35		/* Number used */
>+#define DT_RELRSZ	35		/* Total size of RELR relative relocations */
>+#define DT_RELR		36		/* Address of RELR relative relocations */
>+#define DT_RELRENT	37		/* Size of one RELR relative relocaction */
>+#define	DT_NUM		38		/* Number used */
> #define DT_LOOS		0x6000000d	/* Start of OS-specific */
> #define DT_HIOS		0x6ffff000	/* End of OS-specific */
> #define DT_LOPROC	0x70000000	/* Start of processor-specific */
>diff --git a/scripts/glibcelf.py b/scripts/glibcelf.py
>index 8f7d0ca184..637f632038 100644
>--- a/scripts/glibcelf.py
>+++ b/scripts/glibcelf.py
>@@ -298,6 +298,7 @@ class Sht(_OpenIntEnum):
>     SHT_PREINIT_ARRAY = 16
>     SHT_GROUP = 17
>     SHT_SYMTAB_SHNDX = 18
>+    SHT_RELR = 19
>     SHT_GNU_ATTRIBUTES = 0x6ffffff5
>     SHT_GNU_HASH = 0x6ffffff6
>     SHT_GNU_LIBLIST = 0x6ffffff7
>@@ -587,6 +588,9 @@ class Dt(_OpenIntEnum):
>     DT_PREINIT_ARRAY = 32
>     DT_PREINIT_ARRAYSZ = 33
>     DT_SYMTAB_SHNDX = 34
>+    DT_RELRSZ = 35
>+    DT_RELR = 36
>+    DT_RELRENT = 37
>     DT_GNU_PRELINKED = 0x6ffffdf5
>     DT_GNU_CONFLICTSZ = 0x6ffffdf6
>     DT_GNU_LIBLISTSZ = 0x6ffffdf7
>-- 
>2.35.1
>
Reviewed-by: Fangrui Song <maskray@google.com>