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llvm-project/lld/test/ELF/aarch64-fpic-got.s

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[lld] [ELF/AARCH64] Fix dynamic relocation from PIC GOT access This patch fixes dynamic relocation creation from GOT access in dynamic objects on aarch64. Current code creates a plt relative one (R_AARCH64_JUMP_SLOT) instead of a got relative (R_AARCH64_GLOB_DAT). It leads the programs fails with: $ cat t.cc std::string test = "hello...\n"; int main () { printf ("%s\n", test.c_str()); return 0; } $ clang++ t.cc -fpic -o t $ ./t hello... Segmentation fault (core dumped) Due the fact it will try to access the plt instead of the got for __cxa_atexit registration for the std::string destruction. It will lead in a bogus function address in atexit. llvm-svn: 265784
2016-04-08 22:10:41 +08:00
# REQUIRES: aarch64
# RUN: llvm-mc -filetype=obj -triple=aarch64-none-linux %s -o %t.o
# RUN: llvm-mc -filetype=obj -triple=aarch64-none-linux %p/Inputs/shared.s -o %t-lib.o
# RUN: ld.lld -shared %t-lib.o -o %t-lib.so
# RUN: ld.lld %t-lib.so %t.o -o %t.exe
# RUN: llvm-readobj -dyn-relocations %t.exe | FileCheck %s
## Checks if got access to dynamic objects is done through a got relative
## dynamic relocation and not using plt relative (R_AARCH64_JUMP_SLOT).
# CHECK: Dynamic Relocations {
# CHECK-NEXT: 0x{{[0-9A-F]+}} R_AARCH64_GLOB_DAT bar 0x0
# CHECK-NEXT: }
.globl _start
_start:
adrp x0, :got:bar
ldr x0, [x0, :got_lo12:bar]