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