https://sourceware.org/bugzilla/show_bug.cgi?id=16496
Bug ID: 16496
Summary: readelf/objdump fail to display symbol version in
dynamic relocation
Product: binutils
Version: 2.25 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: binutils
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
[hjl@gnu-6 pr16477]$ make clean
rm -f *.o
[hjl@gnu-6 pr16477]$ cat liba.c
const char* sd_get_seats(void) {return "bla bla";}
[hjl@gnu-6 pr16477]$ cat liba.sym
LIBSYSTEMD_209 {
global:
sd_get_seats;
};
[hjl@gnu-6 pr16477]$ cat libb.c
#include "linkwarning.h"
void new_sd_get_seats(void);
__asm__(".symver new_sd_get_seats,sd_get_seats@LIBSYSTEMD_209");
static void (*resolve_sd_get_seats(void)) (void) {
return new_sd_get_seats;
}
void sd_get_seats(void) __attribute__((ifunc("resolve_sd_get_seats")));
link_warning(sd_get_seats, "sd_get_seats is obsolete");
[hjl@gnu-6 pr16477]$ cat libb.sym
LIBSYSTEMD_208 {
global:
sd_get_seats;
};
[hjl@gnu-6 pr16477]$ make libb.so
gcc -B./ -O -g -fPIC -c -o libb.o libb.c
gcc -B./ -O -g -fPIC -c -o liba.o liba.c
gcc -B./ -o liba.so -shared liba.o -Wl,--version-script=liba.sym
gcc -B./ -o libb.so -shared libb.o liba.so -Wl,--version-script=libb.sym
[hjl@gnu-6 pr16477]$ objdump -R libb.so
libb.so: file format elf64-x86-64
DYNAMIC RELOCATION RECORDS
OFFSET TYPE VALUE
00000000002007c8 R_X86_64_RELATIVE *ABS*+0x00000000000006e0
00000000002007d0 R_X86_64_RELATIVE *ABS*+0x00000000000006a0
00000000002007e0 R_X86_64_RELATIVE *ABS*+0x00000000002007e0
00000000002009d8 R_X86_64_GLOB_DAT _ITM_deregisterTMCloneTable
00000000002009e0 R_X86_64_GLOB_DAT __gmon_start__
00000000002009e8 R_X86_64_GLOB_DAT sd_get_seats
00000000002009f0 R_X86_64_GLOB_DAT _Jv_RegisterClasses
00000000002009f8 R_X86_64_GLOB_DAT _ITM_registerTMCloneTable
0000000000200a00 R_X86_64_GLOB_DAT __cxa_finalize
0000000000200a20 R_X86_64_JUMP_SLOT __gmon_start__
0000000000200a28 R_X86_64_JUMP_SLOT __cxa_finalize
[hjl@gnu-6 pr16477]$ readelf -rs libb.so
Relocation section '.rela.dyn' at offset 0x4d8 contains 9 entries:
Offset Info Type Sym. Value Sym. Name +
Addend
0000002007c8 000000000008 R_X86_64_RELATIVE 6e0
0000002007d0 000000000008 R_X86_64_RELATIVE 6a0
0000002007e0 000000000008 R_X86_64_RELATIVE 2007e0
0000002009d8 000200000006 R_X86_64_GLOB_DAT 0000000000000000
_ITM_deregisterTMClone + 0
0000002009e0 000300000006 R_X86_64_GLOB_DAT 0000000000000000 __gmon_start__ +
0
0000002009e8 000400000006 R_X86_64_GLOB_DAT 0000000000000000 sd_get_seats + 0
0000002009f0 000500000006 R_X86_64_GLOB_DAT 0000000000000000
_Jv_RegisterClasses + 0
0000002009f8 000600000006 R_X86_64_GLOB_DAT 0000000000000000
_ITM_registerTMCloneTa + 0
000000200a00 000700000006 R_X86_64_GLOB_DAT 0000000000000000 __cxa_finalize +
0
Relocation section '.rela.plt' at offset 0x5b0 contains 2 entries:
Offset Info Type Sym. Value Sym. Name +
Addend
000000200a20 000300000007 R_X86_64_JUMP_SLO 0000000000000000 __gmon_start__ +
0
000000200a28 000700000007 R_X86_64_JUMP_SLO 0000000000000000 __cxa_finalize +
0
Symbol table '.dynsym' contains 15 entries:
Num: Value Size Type Bind Vis Ndx Name
0: 0000000000000000 0 NOTYPE LOCAL DEFAULT UND
1: 00000000000005e0 0 SECTION LOCAL DEFAULT 10
2: 0000000000000000 0 NOTYPE WEAK DEFAULT UND
_ITM_deregisterTMCloneTab
3: 0000000000000000 0 NOTYPE WEAK DEFAULT UND __gmon_start__
4: 0000000000000000 0 FUNC GLOBAL DEFAULT UND
sd_get_seats@LIBSYSTEMD_209 (3)
5: 0000000000000000 0 NOTYPE WEAK DEFAULT UND _Jv_RegisterClasses
6: 0000000000000000 0 NOTYPE WEAK DEFAULT UND
_ITM_registerTMCloneTable
7: 0000000000000000 0 FUNC WEAK DEFAULT UND
__cxa_finalize@GLIBC_2.2.5 (4)
8: 0000000000200a30 0 NOTYPE GLOBAL DEFAULT 23 _edata
9: 0000000000200a38 0 NOTYPE GLOBAL DEFAULT 24 _end
10: 0000000000000715 8 IFUNC GLOBAL DEFAULT 12
sd_get_seats@@LIBSYSTEMD_208
11: 0000000000200a30 0 NOTYPE GLOBAL DEFAULT 24 __bss_start
12: 00000000000005e0 0 FUNC GLOBAL DEFAULT 10 _init
13: 0000000000000720 0 FUNC GLOBAL DEFAULT 13 _fini
14: 0000000000000000 0 OBJECT GLOBAL DEFAULT ABS LIBSYSTEMD_208
I am expecting sd_get_seats@LIBSYSTEMD_209 in dynamic relocation
instead of sd_get_seats.
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