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authorDmitry Chestnykh <dm.chestnykh@gmail.com>2024-02-06 09:13:41 +0300
committerWaldemar Brodkorb <wbx@openadk.org>2024-02-07 13:47:28 +0100
commit395f920c0a29dd565a66b268ea00fc444ae64086 (patch)
tree78e0c6905d3f98b1e53c5c562dea9f99c4e69983 /include/elf.h
parent0fef8e7e0661daa17a9ca17b087f55dcb752b378 (diff)
ld.so: Add support of DT_RELR relocation format.
Nowadays modern libcs like Glibc and musl currently support processing of RELATIVE relocations compressed with DT_RELR format. However I have noticed that uClibc-ng doesn't support this feature and if the source will be linked with `-Wl,-z,pack-relative-relos` (bfd) or `-Wl,--pack-dyn-relocs=relr` (lld) then ld.so cannot properly load the produced DSO. This patch is intended to fix this issue and adds applying of DT_RELR relative relocation. Signed-off-by: Dmitry Chestnykh <dm.chestnykh@gmail.com>
Diffstat (limited to 'include/elf.h')
-rw-r--r--include/elf.h8
1 files changed, 7 insertions, 1 deletions
diff --git a/include/elf.h b/include/elf.h
index b7edbade2..c2efa9978 100644
--- a/include/elf.h
+++ b/include/elf.h
@@ -60,6 +60,9 @@ typedef uint16_t Elf64_Section;
typedef Elf32_Half Elf32_Versym;
typedef Elf64_Half Elf64_Versym;
+/* Type for relative relocations in DT_RELR format */
+typedef Elf32_Word Elf32_Relr;
+typedef Elf64_Xword Elf64_Relr;
/* The ELF file header. This appears at the start of every ELF file. */
@@ -818,7 +821,10 @@ typedef struct
#define DT_ENCODING 32 /* Start of encoded range */
#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_NUM 34 /* Number used */
+#define DT_RELRSZ 35 /* Size in bytes, of DT_RELR table */
+#define DT_RELR 36 /* Address of Relr relocs */
+#define DT_RELRENT 37 /* Size in bytes of one DT_RELR entry */
+#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 */