https://sourceware.org/bugzilla/show_bug.cgi?id=19891
Bug ID: 19891
Summary: arm: The order of IFUNC (R_ARM_IRELATIVE and
R_ARM_JUMP_SLOT) relocations is incorrect
Product: binutils
Version: 2.25
Status: NEW
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: dimitry at google dot com
CC: ian at airs dot com
Target Milestone: ---
Here readelf -r -W output for arm library:
Relocation section '.rel.dyn' at offset 0x5f8 contains 29 entries:
Offset Info Type Sym. Value Symbol's Name
00003e30 00000017 R_ARM_RELATIVE
00003e34 00000017 R_ARM_RELATIVE
00003e40 00000017 R_ARM_RELATIVE
00003e44 00000017 R_ARM_RELATIVE
00003e48 00000017 R_ARM_RELATIVE
00003e4c 00000017 R_ARM_RELATIVE
00003e50 00000017 R_ARM_RELATIVE
00003e54 00000017 R_ARM_RELATIVE
00003e58 00000017 R_ARM_RELATIVE
00003e5c 00000017 R_ARM_RELATIVE
00003e60 00000017 R_ARM_RELATIVE
00003e64 00000017 R_ARM_RELATIVE
00003e68 00000017 R_ARM_RELATIVE
00003e6c 00000017 R_ARM_RELATIVE
00003e70 00000017 R_ARM_RELATIVE
00003e74 00000017 R_ARM_RELATIVE
00003e78 00000017 R_ARM_RELATIVE
00003e7c 00000017 R_ARM_RELATIVE
00003fb0 00000017 R_ARM_RELATIVE
00003fb4 00000017 R_ARM_RELATIVE
00003fb8 00000017 R_ARM_RELATIVE
00004000 00000017 R_ARM_RELATIVE
00003fa8 00000815 R_ARM_GLOB_DAT 00000000 __stack_chk_guard
00003fac 00000b15 R_ARM_GLOB_DAT 00000000 stderr
00003f98 00000f15 R_ARM_GLOB_DAT 000008f5 return_true
00003f9c 00001015 R_ARM_GLOB_DAT 00000901 return_false
00003fa4 00001515 R_ARM_GLOB_DAT 0000090d f1
00003fa0 00001815 R_ARM_GLOB_DAT 00000919 f2
00003ffc 000000a0 R_ARM_IRELATIVE
Relocation section '.rel.plt' at offset 0x6e0 contains 13 entries:
Offset Info Type Sym. Value Symbol's Name
00003fc8 00000116 R_ARM_JUMP_SLOT 00000000 __cxa_finalize
00003fcc 00000316 R_ARM_JUMP_SLOT 00000000 __cxa_atexit
00003fd0 00000416 R_ARM_JUMP_SLOT 00000000 __register_atfork
00003fd4 00000616 R_ARM_JUMP_SLOT 00000000 getenv
00003fd8 00001216 R_ARM_JUMP_SLOT foo() foo
00003fdc 00000716 R_ARM_JUMP_SLOT 00000000 __stack_chk_fail
00003fe0 00000916 R_ARM_JUMP_SLOT 00000000 abort
00003fe4 00000a16 R_ARM_JUMP_SLOT 00000000 fprintf
00003fe8 00000e16 R_ARM_JUMP_SLOT 00000000 __aeabi_memcpy
00003fec 00000d16 R_ARM_JUMP_SLOT 00000000 __aeabi_memclr8
00003ff0 00000216 R_ARM_JUMP_SLOT 00000000 dladdr
00003ff4 00000516 R_ARM_JUMP_SLOT 00000000 __snprintf_chk
00003ff8 00000c16 R_ARM_JUMP_SLOT 00000000 __gnu_Unwind_Find_exidx
2 problems:
1. R_ARM_IRELATIVE -> to make sure that the function is ready to be called by
this relocation it needs to be in .rel.plt segment and go after everything
else.
2. 00003fd8 00001216 R_ARM_JUMP_SLOT foo() foo
same problem here - should be last
Here is output for the same library on arm64 (for the reference):
Relocation section '.rela.dyn' at offset 0x600 contains 6 entries:
Offset Info Type Symbol's Value
Symbol's Name + Addend
0000000000001d50 0000000000000403 R_AARCH64_RELATIVE
7b0
0000000000001d58 0000000000000403 R_AARCH64_RELATIVE
7a0
0000000000001f98 0000000500000401 R_AARCH64_GLOB_DAT 0000000000000860
return_true + 0
0000000000001fa0 0000000600000401 R_AARCH64_GLOB_DAT 000000000000086c
return_false + 0
0000000000001fb0 0000000b00000401 R_AARCH64_GLOB_DAT 0000000000000878 f1 +
0
0000000000001fa8 0000000e00000401 R_AARCH64_GLOB_DAT 0000000000000884 f2 +
0
Relocation section '.rela.plt' at offset 0x690 contains 6 entries:
Offset Info Type Symbol's Value
Symbol's Name + Addend
0000000000001fd0 0000000100000402 R_AARCH64_JUMP_SLOT 0000000000000000
__cxa_finalize + 0
0000000000001fd8 0000000400000402 R_AARCH64_JUMP_SLOT 0000000000000000
__cxa_atexit + 0
0000000000001fe0 0000000200000402 R_AARCH64_JUMP_SLOT 0000000000000000
__register_atfork + 0
0000000000001fe8 0000000300000402 R_AARCH64_JUMP_SLOT 0000000000000000
getenv + 0
0000000000001ff0 0000000800000402 R_AARCH64_JUMP_SLOT foo() foo
+ 0
0000000000001ff8 0000000000000408 R_AARCH64_IRELATIVE
890
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