https://sourceware.org/bugzilla/show_bug.cgi?id=29551
Bug ID: 29551
Summary: Wrong relocations against _GLOBAL_OFFSET_TABLE_
Product: binutils
Version: 2.40 (HEAD)
Status: NEW
Severity: normal
Priority: P2
Component: gas
Assignee: unassigned at sourceware dot org
Reporter: hjl.tools at gmail dot com
Target Milestone: ---
Target: i386,x86-64
[hjl@gnu-tgl-3 tmp]$ cat 32.s
.text
movl $_GLOBAL_OFFSET_TABLE_, %eax
.data
.long _GLOBAL_OFFSET_TABLE_
[hjl@gnu-tgl-3 tmp]$ gcc -c 32.s -m32
[hjl@gnu-tgl-3 tmp]$ readelf -r 32.o
Relocation section '.rel.text' at offset 0xa0 contains 1 entry:
Offset Info Type Sym.Value Sym. Name
00000001 0000010a R_386_GOTPC 00000000 _GLOBAL_OFFSET_TABLE_
Relocation section '.rel.data' at offset 0xa8 contains 1 entry:
Offset Info Type Sym.Value Sym. Name
00000000 0000010a R_386_GOTPC 00000000 _GLOBAL_OFFSET_TABLE_
[hjl@gnu-tgl-3 tmp]$
R_386_32 should be used.
[hjl@gnu-tgl-3 tmp]$ cat 64.s
.text
movl $_GLOBAL_OFFSET_TABLE_, %eax
movq _GLOBAL_OFFSET_TABLE_@GOTPCREL(%rip), %rax
.data
.quad _GLOBAL_OFFSET_TABLE_
[hjl@gnu-tgl-3 tmp]$ gcc -c 64.s
[hjl@gnu-tgl-3 tmp]$ readelf -rW 64.o
Relocation section '.rela.text' at offset 0xd0 contains 2 entries:
Offset Info Type Symbol's Value
Symbol's Name + Addend
0000000000000001 000000010000001a R_X86_64_GOTPC32 0000000000000000
_GLOBAL_OFFSET_TABLE_ + 1
0000000000000008 0000000100000019 R_X86_64_GOTOFF64 0000000000000000
_GLOBAL_OFFSET_TABLE_ - 4
Relocation section '.rela.data' at offset 0x100 contains 1 entry:
Offset Info Type Symbol's Value
Symbol's Name + Addend
0000000000000000 000000010000001d R_X86_64_GOTPC64 0000000000000000
_GLOBAL_OFFSET_TABLE_ + 0
[hjl@gnu-tgl-3 tmp]$
Relocations should be
[hjl@gnu-tgl-3 tmp]$ readelf -rW 64x.o
Relocation section '.rela.text' at offset 0xe8 contains 2 entries:
Offset Info Type Symbol's Value
Symbol's Name + Addend
0000000000000001 000000010000000a R_X86_64_32 0000000000000000
_GLOBAL_OFFSET_TABLE_ + 0
0000000000000008 000000010000002a R_X86_64_REX_GOTPCRELX 0000000000000000
_GLOBAL_OFFSET_TABLE_ - 4
Relocation section '.rela.data' at offset 0x118 contains 1 entry:
Offset Info Type Symbol's Value
Symbol's Name + Addend
0000000000000000 0000000100000001 R_X86_64_64 0000000000000000
_GLOBAL_OFFSET_TABLE_ + 0
[hjl@gnu-tgl-3 tmp]$
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