4aaf6d1b8c
Previously, we only used `objcopy`, which is not available for some build configurations. With this patch, we not only try to use `objcopy`, but also try to use `llvm-objcopy` if available. This is a follow-up of https://github.com/llvm/llvm-project/pull/156383.
60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
// -*- C++ -*-
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// Manually marking the .eh_frame_hdr as DW_EH_PE_omit to make libunwind to do
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// the linear search.
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// Assuming the begining of the function is at the start of the FDE range.
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// clang-format off
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// REQUIRES: target={{x86_64-.+-linux-gnu}}
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// REQUIRES: objcopy-available
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// TODO: Figure out why this fails with Memory Sanitizer.
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// XFAIL: msan
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// RUN: %{build}
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// RUN: %{objcopy} --dump-section .eh_frame_hdr=%t_ehf_hdr.bin %t.exe
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// RUN: echo -ne '\xFF' | dd of=%t_ehf_hdr.bin bs=1 seek=2 count=2 conv=notrunc status=none
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// RUN: %{objcopy} --update-section .eh_frame_hdr=%t_ehf_hdr.bin %t.exe
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// RUN: %{exec} %t.exe
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// clang-format on
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#include <assert.h>
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#include <libunwind.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <unwind.h>
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void f() {
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printf("123\n");
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void *pc = __builtin_return_address(0);
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void *fpc = (void *)&f;
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void *fpc1 = (void *)((uintptr_t)fpc + 1);
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struct dwarf_eh_bases bases;
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const void *fde_pc = _Unwind_Find_FDE(pc, &bases);
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const void *fde_fpc = _Unwind_Find_FDE(fpc, &bases);
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const void *fde_fpc1 = _Unwind_Find_FDE(fpc1, &bases);
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printf("fde_pc = %p\n", fde_pc);
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printf("fde_fpc = %p\n", fde_fpc);
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printf("fde_fpc1 = %p\n", fde_fpc1);
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fflush(stdout);
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assert(fde_pc != NULL);
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assert(fde_fpc != NULL);
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assert(fde_fpc1 != NULL);
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assert(fde_fpc == fde_fpc1);
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}
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int main() {
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f();
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return 0;
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}
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