derek.holloway
7502bf64a4
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30 lines
841 B
ArmAsm
30 lines
841 B
ArmAsm
## Verify that BOLT does not crash while encountering instruction sequence that
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## does not perfectly match jump table pattern.
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# REQUIRES: system-linux
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# RUN: llvm-mc -filetype=obj -triple aarch64-unknown-unknown %s -o %t.o
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# RUN: %clang %cflags --target=aarch64-unknown-linux %t.o -o %t.exe -Wl,-q
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# RUN: llvm-bolt %t.exe -o %t.bolt --print-cfg 2>&1 | FileCheck %s
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.section .text
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.align 4
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.globl _start
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.type _start, %function
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_start:
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sub w0, w0, #0x4a
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## The address loaded into x22 is undefined. However, the instructions that
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## follow ldr, use the x22 address as a regular jump table.
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ldr x22, [x29, #0x98]
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ldrb w0, [x22, w0, uxtw]
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adr x1, #12
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add x0, x1, w0, sxtb #2
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br x0
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# CHECK: br x0 # UNKNOWN
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.L0:
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ret
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.size _start, .-_start
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## Force relocation mode.
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.reloc 0, R_AARCH64_NONE
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