744a469bba
When using -no-pie without a SECTIONS command, the linker uses the target's default image base. If -Ttext= or --section-start specifies an output section address below this base, the result is likely unintended. LLD will give a diagnostic (#140187) and may change the behavior in the future. It's good to set an explicit image base to avoid relying on its current behavior. BOLT doesn't seem to care whether a PT_PHDR segment is present. Pull Request: https://github.com/llvm/llvm-project/pull/140570
44 lines
1.3 KiB
ArmAsm
44 lines
1.3 KiB
ArmAsm
# Regression test for https://github.com/llvm/llvm-project/issues/100096
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# static glibc binaries crash on startup because _init is moved and
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# shares its address with an array end pointer. The GOT rewriting can't
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# tell the two pointers apart and incorrectly updates the _array_end
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# address. Test checks that _init is not moved.
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# RUN: llvm-mc -filetype=obj -triple aarch64-unknown-unknown %s -o %t.o
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# RUN: %clang %cflags %t.o -o %t.exe -Wl,-q -static -Wl,--image-base=0,-Tdata=0x1000,--section-start=.init=0x1004
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# RUN: llvm-bolt %t.exe -o %t.bolt
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# RUN: llvm-nm %t.exe | FileCheck --check-prefix=CHECK-ORIGINAL %s
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# RUN: llvm-nm %t.bolt | FileCheck --check-prefix=CHECK-BOLTED %s
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.section .data
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.globl _array_end
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_array_start:
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.word 0x0
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_array_end:
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.section .init,"ax",@progbits
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.globl _init
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# Check that bolt doesn't move _init.
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#
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# CHECK-ORIGINAL: 0000000000001004 T _init
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# CHECK-BOLTED: 0000000000001004 T _init
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_init:
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ret
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.section .text,"ax",@progbits
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.globl _start
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# Check that bolt is moving some other functions.
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#
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# CHECK-ORIGINAL: 0000000000001008 T _start
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# CHECK-BOLTED-NOT: 0000000000001008 T _start
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_start:
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bl _init
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adrp x0, #:got:_array_end
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ldr x0, [x0, #:gotpage_lo15:_array_end]
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adrp x0, #:got:_init
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ldr x0, [x0, #:gotpage_lo15:_init]
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ret
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