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readelf: Support SHT_RELR/DT_RELR for -r

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The -r output for SHT_RELR looks like:

Relocation section '.relr.dyn' at offset 0x530 contains 4 entries:
  7 offsets
00000000000028c0
00000000000028c8
0000000000003ad0
0000000000003ad8
0000000000003ae0
0000000000003ae8
0000000000003af0

For --use-dynamic, the header looks like

    'RELR' relocation section at offset 0x530 contains 32 bytes:

include/
    * elf/common.h (DT_ENCODING): Bump to 38.
    * elf/external.h (Elf32_External_Relr): New.
    (Elf64_External_Relr): New.
binutils/
    * readelf.c (enum relocation_type): New.
    (slurp_relr_relocs): New.
    (dump_relocations): Change is_rela to rel_type.
    Dump RELR.
    (dynamic_relocations): Add DT_RELR.
    (process_relocs): Check SHT_RELR and DT_RELR.
    (process_dynamic_section): Store into dynamic_info for
    DT_RELR/DT_RELRENT/DT_RELRSZ.
This commit is contained in:
Fangrui Song
2021-11-16 13:03:57 -08:00
parent 830070c66d
commit a7fd118627
6 changed files with 153 additions and 30 deletions
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2
include/elf/common.h
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@@ -1102,13 +1102,13 @@
#define DT_FINI_ARRAYSZ 28
#define DT_RUNPATH 29
#define DT_FLAGS 30
#define DT_ENCODING 32
#define DT_PREINIT_ARRAY 32
#define DT_PREINIT_ARRAYSZ 33
#define DT_SYMTAB_SHNDX 34
#define DT_RELRSZ 35
#define DT_RELR 36
#define DT_RELRENT 37
#define DT_ENCODING 38
/* Note, the Oct 4, 1999 draft of the ELF ABI changed the values
for DT_LOOS and DT_HIOS. Some implementations however, use