b16d6653c0
dl_iterate_phdr is used to search for unwind info provided by either PT_GNU_EH_FRAME or PT_ARM_EXIDX. Most of the code between the two is the same, so combine them, and factor out what's different into checkForUnwindInfoSegment. Details: - The FrameHeaderCache can now be enabled for ARM EHABI. - findUnwindSectionsByPhdr now finds the last PT_ARM_EXIDX rather than the first. There should only be one segment. - The dso_base and text_segment_length fields of UnwindInfoSections are now needed for dl_iterate_phdr when using EHABI, to hold the low and high PC values for a cache entry. Reviewed By: compnerd, danielkiss, #libunwind, saugustine Differential Revision: https://reviews.llvm.org/D87880
73 lines
1.9 KiB
C++
73 lines
1.9 KiB
C++
// The other libunwind tests don't test internal interfaces, so the include path
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// is a little wonky.
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#include "../src/config.h"
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// Only run this test under supported configurations.
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#if defined(_LIBUNWIND_USE_DL_ITERATE_PHDR) && \
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defined(_LIBUNWIND_USE_FRAME_HEADER_CACHE)
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#include <link.h>
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#include <stdio.h>
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// This file defines several of the data structures needed here,
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// and includes FrameHeaderCache.hpp as well.
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#include "../src/AddressSpace.hpp"
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#define kBaseAddr 0xFFF000
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#define kTextSegmentLength 0xFF
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using namespace libunwind;
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int main() {
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FrameHeaderCache FHC;
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struct dl_phdr_info PInfo;
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memset(&PInfo, 0, sizeof(PInfo));
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// The cache itself should only care about these two fields--they
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// tell the cache to invalidate or not; everything else is handled
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// by AddressSpace.hpp.
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PInfo.dlpi_adds = 6;
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PInfo.dlpi_subs = 7;
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UnwindInfoSections UIS;
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UIS.dso_base = kBaseAddr;
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UIS.text_segment_length = kTextSegmentLength;
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dl_iterate_cb_data CBData;
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// Unused by the cache.
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CBData.addressSpace = nullptr;
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CBData.sects = &UIS;
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CBData.targetAddr = kBaseAddr + 1;
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// Nothing present, shouldn't find.
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if (FHC.find(&PInfo, 0, &CBData))
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abort();
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FHC.add(&UIS);
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// Just added. Should find.
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if (!FHC.find(&PInfo, 0, &CBData))
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abort();
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// Cache is invalid. Shouldn't find.
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PInfo.dlpi_adds++;
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if (FHC.find(&PInfo, 0, &CBData))
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abort();
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FHC.add(&UIS);
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CBData.targetAddr = kBaseAddr - 1;
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// Shouldn't find something outside of the addresses.
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if (FHC.find(&PInfo, 0, &CBData))
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abort();
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// Add enough things to the cache that the entry is evicted.
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for (int i = 0; i < 9; i++) {
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UIS.dso_base = kBaseAddr + (kTextSegmentLength * i);
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FHC.add(&UIS);
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}
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CBData.targetAddr = kBaseAddr;
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// Should have been evicted.
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if (FHC.find(&PInfo, 0, &CBData))
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abort();
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return 0;
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}
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#else
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int main() { return 0;}
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#endif
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