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//===- 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 "common.h"
#include "executor_address.h"
#include "orc/c_api.h"
#include "wrapper_function_utils.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) {
return WrapperFunction<SPSError(SPSExecutorAddrRange)>::handle(
ArgData, ArgSize,
[](ExecutorAddrRange FrameSection) -> Error {
walkEHFrameSection(FrameSection.toSpan<const char>(),
__register_frame);
return Error::success();
})
.release();
}
ORC_RT_INTERFACE __orc_rt_CWrapperFunctionResult
__orc_rt_macho_deregister_ehframe_section(char *ArgData, size_t ArgSize) {
return WrapperFunction<SPSError(SPSExecutorAddrRange)>::handle(
ArgData, ArgSize,
[](ExecutorAddrRange FrameSection) -> Error {
walkEHFrameSection(FrameSection.toSpan<const char>(),
__deregister_frame);
return Error::success();
})
.release();
}
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