https://sourceware.org/bugzilla/show_bug.cgi?id=26939
Bug ID: 26939
Summary: gold: Don't relax R_X86_64_GOTPCRELX when addend != -4
Product: binutils
Version: unspecified
Status: UNCONFIRMED
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: i at maskray dot me
CC: ian at airs dot com
Target Milestone: ---
Clang emits movl x@GOTPCREL+4(%rip), %eax for the following code:
void x();
int foo() { return (long)x >> 32; }
HJ Lu said this is valid:
https://sourceware.org/pipermail/binutils/2020-November/114264.html
---
Let's compare the -no-pie linked output of `movl foo@GOTPCREL(%rip), %eax; movl
foo@GOTPCREL+4(%rip), %eax`:
GNU ld (the second instruction loads the high 32-bit address):
0000000000401000 <foo-0xd>:
401000: 48 c7 c0 0d 10 40 00 mov rax,0x40100d
401007: 8b 05 ef 1f 00 00 mov eax,DWORD PTR [rip+0x1fef]
# 402ffc <.got+0x4>
gold (the second instruction loads the address of foo plus 4; it should be
changed to not relax the instruction):
00000000004000e8 <foo-0xd>:
4000e8: 48 8d 05 06 00 00 00 lea rax,[rip+0x6] # 4000f5
<foo>
4000ef: 8d 05 04 00 00 00 lea eax,[rip+0x4] # 4000f9
<foo+0x4>
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