https://sourceware.org/bugzilla/show_bug.cgi?id=19169
Bug ID: 19169
Summary: Gold emits incorrect R_AARCH64_ABS64
Product: binutils
Version: 2.24
Status: NEW
Severity: normal
Priority: P2
Component: gold
Assignee: ccoutant at gmail dot com
Reporter: eugeni.stepanov at gmail dot com
CC: ian at airs dot com
Target Milestone: ---
The following code, when placed in a non-symbolically linked shared library,
fails on Android/AArch64 when linked with gold.
int A[10] = {1, 0};
int *B = A;
extern "C" void f() {
int *C = A;
assert(B == C);
}
Let's reduce it to:
int A[10] = {1, 0};
int *B = A;
$ objdump -t 1.o
0000000000000000 g O .data 0000000000000028 A
0000000000000000 g O .data.rel 0000000000000008 B
$ objdump -r 1.o
RELOCATION RECORDS FOR [.data.rel]:
OFFSET TYPE VALUE
0000000000000000 R_AARCH64_ABS64 A
$ objdump -s -j .data.rel 1.o
Contents of section .data.rel:
0000 00000000 00000000 ........
Link with gold.
$ objdump -T gold.so
0000000000002018 g DO .data 0000000000000028 A
0000000000002040 g DO .data 0000000000000008 B
$ objdump -R gold.so
DYNAMIC RELOCATION RECORDS
OFFSET TYPE VALUE
0000000000001e28 R_AARCH64_RELATIVE *ABS*+0x00000000000003e0
0000000000002040 R_AARCH64_ABS64 A
$ objdump -s -j .data gold.so
Contents of section .data:
2010 00000000 00000000 01000000 00000000 ................
2020 00000000 00000000 00000000 00000000 ................
2030 00000000 00000000 00000000 00000000 ................
2040 18200000 00000000 . ......
The addend at 0x2040 is not zero. This makes B point to A + 0x182.
The addend should be zero.
To reproduce:
grab android-ndk-r10e from google
./build/tools/make-standalone-toolchain.sh --toolchain
aarch64-linux-android-clang3.6 --platform=android-21
--install-dir=standalone-clang-aarch64
cd standalone-clang-aarch64
cat >1.cc
int A[10] = {1, 0};
int *B = A;
^D
./bin/clang++ 1.cc -shared -fPIC -o 1.so -fuse-ld=gold
objdump -s -j .data 1.so
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