forked from OSchip/llvm-project
69 lines
2.6 KiB
C++
69 lines
2.6 KiB
C++
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//===- ehframe_registration.cpp -------------------------------------------===//
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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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//
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// This file contains code required to load the rest of the MachO runtime.
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//
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//===----------------------------------------------------------------------===//
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#include "adt.h"
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#include "c_api.h"
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#include "common.h"
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using namespace __orc_rt;
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// eh-frame registration functions.
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// We expect these to be available for all processes.
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extern "C" void __register_frame(const void *);
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extern "C" void __deregister_frame(const void *);
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namespace {
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template <typename HandleFDEFn>
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void walkEHFrameSection(span<const char> EHFrameSection,
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HandleFDEFn HandleFDE) {
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const char *CurCFIRecord = EHFrameSection.data();
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uint64_t Size = *reinterpret_cast<const uint32_t *>(CurCFIRecord);
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while (CurCFIRecord != EHFrameSection.end() && Size != 0) {
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const char *OffsetField = CurCFIRecord + (Size == 0xffffffff ? 12 : 4);
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if (Size == 0xffffffff)
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Size = *reinterpret_cast<const uint64_t *>(CurCFIRecord + 4) + 12;
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else
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Size += 4;
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uint32_t Offset = *reinterpret_cast<const uint32_t *>(OffsetField);
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if (Offset != 0)
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HandleFDE(CurCFIRecord);
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CurCFIRecord += Size;
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Size = *reinterpret_cast<const uint32_t *>(CurCFIRecord);
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}
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}
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} // end anonymous namespace
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ORC_RT_INTERFACE __orc_rt_CWrapperFunctionResult
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__orc_rt_macho_register_ehframe_section(char *ArgData, size_t ArgSize) {
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// NOTE: Does not use SPS to deserialize arg buffer, instead the arg buffer
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// is taken to be the range of the eh-frame section.
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bool HasError = false;
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walkEHFrameSection(span<const char>(ArgData, ArgSize), __register_frame);
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return __orc_rt_CreateCWrapperFunctionResultFromRange((char*)&HasError,
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sizeof(HasError));
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}
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ORC_RT_INTERFACE __orc_rt_CWrapperFunctionResult
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__orc_rt_macho_deregister_ehframe_section(char *ArgData, size_t ArgSize) {
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// NOTE: Does not use SPS to deserialize arg buffer, instead the arg buffer
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// is taken to be the range of the eh-frame section.
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bool HasError = false;
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walkEHFrameSection(span<const char>(ArgData, ArgSize), __deregister_frame);
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return __orc_rt_CreateCWrapperFunctionResultFromRange((char*)&HasError,
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sizeof(HasError));
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}
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