derek.holloway
7502bf64a4
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67 lines
2.0 KiB
ArmAsm
Executable File
67 lines
2.0 KiB
ArmAsm
Executable File
# This reproduces a bug with instrumentation when trying to count calls
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# when the target address is computed with a reference to the stack pointer.
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# Our instrumentation code uses the stack to save registers to be
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# transparent with the instrumented code, but we end up updating the stack
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# pointer while doing so, which affects this target address calculation.
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# The solution is to temporarily fix RSP. Check that we correctly instrument
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# these cases.
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# REQUIRES: system-linux,bolt-runtime
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# RUN: llvm-mc -filetype=obj -triple x86_64-unknown-unknown \
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# RUN: %s -o %t.o
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# RUN: %clang %cflags -no-pie %t.o -o %t.exe -Wl,-q
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# RUN: llvm-bolt %t.exe --instrument --instrumentation-file=%t.fdata \
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# RUN: -o %t.instrumented
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# Instrumented program needs to finish returning zero
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# RUN: %t.instrumented arg1 arg2
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# Test that the instrumented data makes sense
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# RUN: llvm-bolt %t.exe -o %t.bolted --data %t.fdata \
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# RUN: --reorder-blocks=ext-tsp --reorder-functions=hfsort+ \
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# RUN: --print-only=main --print-finalized | FileCheck %s
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# RUN: %t.bolted arg1 arg2
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# Check that our indirect call has 1 hit recorded in the fdata file and that
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# this was processed correctly by BOLT
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# CHECK: callq *0x18(%rsp) # CallProfile: 1 (0 misses) :
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# CHECK-NEXT: { targetFunc: 1 (0 misses) }
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.text
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.globl main
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.type main, %function
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.p2align 4
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main:
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pushq %rbp
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movq %rsp, %rbp
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leaq targetFunc, %rax
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pushq %rax # We save the target function address in the stack
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subq $0x18, %rsp # Set up a dummy stack frame
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cmpl $0x2, %edi
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jb .LBBerror # Add control flow so we don't have a trivial case
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.LBB2:
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callq *0x18(%rsp) # Indirect call using %rsp
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addq $0x20, %rsp
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movq %rbp, %rsp
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pop %rbp
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retq
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.LBBerror:
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addq $0x20, %rsp
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movq %rbp, %rsp
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pop %rbp
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movq $1, %rax # Finish with an error if we go this path
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retq
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.size main, .-main
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.globl targetFunc
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.type targetFunc, %function
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.p2align 4
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targetFunc:
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xorq %rax, %rax
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retq
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.size targetFunc, .-targetFunc
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