https://sourceware.org/bugzilla/show_bug.cgi?id=20092
Bug ID: 20092
Summary: Wrong relaxation with R_X86_64_GOTPCREL
Product: binutils
Version: 2.25
Status: NEW
Severity: normal
Priority: P2
Component: ld
Assignee: unassigned at sourceware dot org
Reporter: ubizjak at gmail dot com
Target Milestone: ---
Soon to be attached object files, compiled from GCC testsuite
(gcc/testsuite/gcc.target/i386):
$ gcc -mcmodel=medium -fpic -fdata-sections -c pr61599-1.c
and
$ gcc -mcmodel=medium -fpic -fdata-sections -c pr61599-2.c
result in following linker error when BFD linker is used:
$ gcc -fuse-ld=bfd pr61599-1.o pr61599-2.o
pr61599-2.o: In function `bar':
pr61599-2.c:(.text+0xe): relocation truncated to fit: R_X86_64_PC32 against
symbol `a' defined in LARGE_COMMON section in pr61599-1.o
collect2: error: ld returned 1 exit status
while they succeed with GOLD linker:
$ gcc -fuse-ld=gold pr61599-1.o pr61599-2.o
$ ./a.out
Please note that there is no R_X86_64_PC32 relocation in object files, so it
looks like wrong relaxation to me:
$ objdump -dr pr61599-1.o
pr61599-1.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <main>:
0: 55 push %rbp
1: 48 89 e5 mov %rsp,%rbp
4: 48 8d 05 00 00 00 00 lea 0x0(%rip),%rax # b <main+0xb>
7: R_X86_64_GOTPC32 _GLOBAL_OFFSET_TABLE_-0x4
b: b8 00 00 00 00 mov $0x0,%eax
10: e8 00 00 00 00 callq 15 <main+0x15>
11: R_X86_64_PLT32 bar-0x4
15: 89 c2 mov %eax,%edx
17: 48 8b 05 00 00 00 00 mov 0x0(%rip),%rax # 1e <main+0x1e>
1a: R_X86_64_GOTPCREL c-0x4
1e: 0f b6 80 e1 00 00 00 movzbl 0xe1(%rax),%eax
25: 0f be c0 movsbl %al,%eax
28: 01 d0 add %edx,%eax
2a: 5d pop %rbp
2b: c3 retq
$ objdump -dr pr61599-2.o
pr61599-2.o: file format elf64-x86-64
Disassembly of section .text:
0000000000000000 <bar>:
0: 55 push %rbp
1: 48 89 e5 mov %rsp,%rbp
4: 48 8d 05 00 00 00 00 lea 0x0(%rip),%rax # b <bar+0xb>
7: R_X86_64_GOTPC32 _GLOBAL_OFFSET_TABLE_-0x4
b: 48 8b 05 00 00 00 00 mov 0x0(%rip),%rax # 12 <bar+0x12>
e: R_X86_64_GOTPCREL a-0x4
12: 0f b6 40 02 movzbl 0x2(%rax),%eax
16: 0f be d0 movsbl %al,%edx
19: 48 8b 05 00 00 00 00 mov 0x0(%rip),%rax # 20 <bar+0x20>
1c: R_X86_64_GOTPCREL b-0x4
20: 0f b6 40 10 movzbl 0x10(%rax),%eax
24: 0f be c0 movsbl %al,%eax
27: 01 c2 add %eax,%edx
29: 48 8b 05 00 00 00 00 mov 0x0(%rip),%rax # 30 <bar+0x30>
2c: R_X86_64_GOTPCREL c-0x4
30: 0f b6 80 00 01 00 00 movzbl 0x100(%rax),%eax
37: 0f be c0 movsbl %al,%eax
3a: 01 d0 add %edx,%eax
3c: 5d pop %rbp
3d: c3 retq
--
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