| // REQUIRES: x86 |
| // RUN: llvm-mc -filetype=obj -triple=x86_64-pc-linux %s -o %t.o |
| // RUN: ld.lld %t.o -shared -o %t.so |
| // RUN: llvm-readelf -s %t.so | FileCheck %s -check-prefix=SECTION |
| // RUN: llvm-objdump -d %t.so | FileCheck %s |
| |
| // SECTION: .dynamic DYNAMIC 0000000000003000 |
| // SECTION: .got PROGBITS 0000000000003070 003070 000000 |
| |
| // All the _GLOBAL_OFFSET_TABLE_ occurrences below refer to the address |
| // of GOT base, not the address of the symbol _GLOBAL_OFFSET_TABLE_. These |
| // instructions are special and produce GOT base relative relocations. We |
| // currently use .got end as the GOT base, which is not equal to |
| // the address of the special symbol _GLOBAL_OFFSET_TABLE_. |
| |
| // The assembly is generated by |
| // gcc -O2 -S -mcmodel=medium -fPIC a.c |
| // This computes the pc-relative address (runtime address) of _DYNAMIC. |
| // |
| // extern long _DYNAMIC[] __attribute__((visibility("hidden"))); |
| // long* dynamic() { return _DYNAMIC; } |
| |
| // 0x3070 (.got end) - 0x1007 = 8297 |
| // 0x3000 (_DYNAMIC) - 0x3070 (.got end) = -112 |
| // CHECK: 1000: {{.*}} leaq 8297(%rip), %rdx |
| // CHECK-NEXT: 1007: {{.*}} movabsq $-112, %rax |
| .global dynamic |
| dynamic: |
| leaq _GLOBAL_OFFSET_TABLE_(%rip), %rdx |
| movabsq $_DYNAMIC@GOTOFF, %rax |
| addq %rdx, %rax |
| ret |
