blob: d0ea7e70201cd202a6a4f6d26c3417bd1320eab8 [file] [log] [blame]
//===- ehframe_registration.cpp -------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file contains code required to load the rest of the MachO runtime.
//
//===----------------------------------------------------------------------===//
#include "adt.h"
#include "c_api.h"
#include "common.h"
using namespace __orc_rt;
// eh-frame registration functions.
// We expect these to be available for all processes.
extern "C" void __register_frame(const void *);
extern "C" void __deregister_frame(const void *);
namespace {
template <typename HandleFDEFn>
void walkEHFrameSection(span<const char> EHFrameSection,
HandleFDEFn HandleFDE) {
const char *CurCFIRecord = EHFrameSection.data();
uint64_t Size = *reinterpret_cast<const uint32_t *>(CurCFIRecord);
while (CurCFIRecord != EHFrameSection.end() && Size != 0) {
const char *OffsetField = CurCFIRecord + (Size == 0xffffffff ? 12 : 4);
if (Size == 0xffffffff)
Size = *reinterpret_cast<const uint64_t *>(CurCFIRecord + 4) + 12;
else
Size += 4;
uint32_t Offset = *reinterpret_cast<const uint32_t *>(OffsetField);
if (Offset != 0)
HandleFDE(CurCFIRecord);
CurCFIRecord += Size;
Size = *reinterpret_cast<const uint32_t *>(CurCFIRecord);
}
}
} // end anonymous namespace
ORC_RT_INTERFACE __orc_rt_CWrapperFunctionResult
__orc_rt_macho_register_ehframe_section(char *ArgData, size_t ArgSize) {
// NOTE: Does not use SPS to deserialize arg buffer, instead the arg buffer
// is taken to be the range of the eh-frame section.
bool HasError = false;
walkEHFrameSection(span<const char>(ArgData, ArgSize), __register_frame);
return __orc_rt_CreateCWrapperFunctionResultFromRange((char*)&HasError,
sizeof(HasError));
}
ORC_RT_INTERFACE __orc_rt_CWrapperFunctionResult
__orc_rt_macho_deregister_ehframe_section(char *ArgData, size_t ArgSize) {
// NOTE: Does not use SPS to deserialize arg buffer, instead the arg buffer
// is taken to be the range of the eh-frame section.
bool HasError = false;
walkEHFrameSection(span<const char>(ArgData, ArgSize), __deregister_frame);
return __orc_rt_CreateCWrapperFunctionResultFromRange((char*)&HasError,
sizeof(HasError));
}