derek.holloway
7502bf64a4
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86 lines
2.9 KiB
ArmAsm
86 lines
2.9 KiB
ArmAsm
## Check that llvm-bolt correctly recognizes veneers/thunks for absolute code
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## generated by LLD.
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# RUN: llvm-mc -filetype=obj -triple aarch64-unknown-unknown %s -o %t.o
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# RUN: %clang %cflags -fno-PIC -no-pie %t.o -o %t.exe -nostdlib \
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# RUN: -fuse-ld=lld -Wl,-q
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# RUN: llvm-objdump -d %t.exe | FileCheck --check-prefix=CHECK-INPUT %s
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# RUN: llvm-objcopy --remove-section .rela.mytext %t.exe
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# RUN: llvm-bolt %t.exe -o %t.bolt
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# RUN: llvm-objdump -d -j .text %t.bolt | \
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# RUN: FileCheck --check-prefix=CHECK-OUTPUT %s
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## Occasionally, we see the linker not generating $d symbols for long veneers
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## causing BOLT to fail veneer elimination.
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# RUN: llvm-objcopy --remove-symbol-prefix='$d' %t.exe %t.no-marker.exe
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# RUN: llvm-bolt %t.no-marker.exe -o %t.no-marker.bolt \
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# RUN: 2>&1 | FileCheck %s --check-prefix=CHECK-BOLT
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# RUN: llvm-objdump -d -j .text %t.no-marker.bolt | \
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# RUN: FileCheck --check-prefix=CHECK-OUTPUT %s
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# CHECK-BOLT-NOT: BOLT-WARNING: unable to disassemble instruction
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# CHECK-BOLT: BOLT-WARNING: missing data marker detected in veneer __AArch64AbsLongThunk_far_function
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.text
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.balign 4
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.global far_function
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.type far_function, %function
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far_function:
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ret
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.size far_function, .-far_function
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.global near_function
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.type near_function, %function
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near_function:
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ret
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.size near_function, .-near_function
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## Force relocations against .text.
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.reloc 0, R_AARCH64_NONE
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.section ".mytext", "ax"
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.balign 4
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## This version of a thunk is always generated by LLD for function calls
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## spanning more than 256MB.
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.global __AArch64AbsLongThunk_far_function
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.type __AArch64AbsLongThunk_far_function, %function
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__AArch64AbsLongThunk_far_function:
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ldr x16, .L1
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br x16
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# CHECK-INPUT-LABEL: <__AArch64AbsLongThunk_far_function>:
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# CHECK-INPUT-NEXT: ldr
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# CHECK-INPUT-NEXT: br
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.L1:
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.quad far_function
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.size __AArch64AbsLongThunk_far_function, .-__AArch64AbsLongThunk_far_function
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## If a callee is closer than 256MB away, LLD may generate a thunk with a direct
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## jump to the callee. Note, that the name might still include "AbsLong".
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.global __AArch64AbsLongThunk_near_function
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.type __AArch64AbsLongThunk_near_function, %function
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__AArch64AbsLongThunk_near_function:
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b near_function
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# CHECK-INPUT-LABEL: <__AArch64AbsLongThunk_near_function>:
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# CHECK-INPUT-NEXT: b {{.*}} <near_function>
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.size __AArch64AbsLongThunk_near_function, .-__AArch64AbsLongThunk_near_function
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## Check that thunks were removed from .text, and _start calls functions
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## directly.
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# CHECK-OUTPUT-NOT: __AArch64AbsLongThunk_{{.*}}
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.global _start
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.type _start, %function
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_start:
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# CHECK-INPUT-LABEL: <_start>:
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# CHECK-OUTPUT-LABEL: <_start>:
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bl __AArch64AbsLongThunk_far_function
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bl __AArch64AbsLongThunk_near_function
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# CHECK-INPUT-NEXT: bl {{.*}} <__AArch64AbsLongThunk_far_function>
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# CHECK-INPUT-NEXT: bl {{.*}} <__AArch64AbsLongThunk_near_function>
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# CHECK-OUTPUT-NEXT: bl {{.*}} <far_function>
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# CHECK-OUTPUT-NEXT: bl {{.*}} <near_function>
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ret
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.size _start, .-_start
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