83 lines
3.1 KiB
C++
83 lines
3.1 KiB
C++
//===- MSFCommon.cpp - Common types and functions for MSF files -----------===//
|
|
//
|
|
// 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
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#include "llvm/DebugInfo/MSF/MSFCommon.h"
|
|
#include "llvm/DebugInfo/MSF/MSFError.h"
|
|
#include "llvm/Support/Endian.h"
|
|
#include "llvm/Support/Error.h"
|
|
#include <cstdint>
|
|
#include <cstring>
|
|
|
|
using namespace llvm;
|
|
using namespace llvm::msf;
|
|
|
|
Error llvm::msf::validateSuperBlock(const SuperBlock &SB) {
|
|
// Check the magic bytes.
|
|
if (std::memcmp(SB.MagicBytes, Magic, sizeof(Magic)) != 0)
|
|
return make_error<MSFError>(msf_error_code::invalid_format,
|
|
"MSF magic header doesn't match");
|
|
|
|
if (!isValidBlockSize(SB.BlockSize))
|
|
return make_error<MSFError>(msf_error_code::invalid_format,
|
|
"Unsupported block size.");
|
|
|
|
// We don't support directories whose sizes aren't a multiple of four bytes.
|
|
if (SB.NumDirectoryBytes % sizeof(support::ulittle32_t) != 0)
|
|
return make_error<MSFError>(msf_error_code::invalid_format,
|
|
"Directory size is not multiple of 4.");
|
|
|
|
// The number of blocks which comprise the directory is a simple function of
|
|
// the number of bytes it contains.
|
|
uint64_t NumDirectoryBlocks =
|
|
bytesToBlocks(SB.NumDirectoryBytes, SB.BlockSize);
|
|
|
|
// The directory, as we understand it, is a block which consists of a list of
|
|
// block numbers. It is unclear what would happen if the number of blocks
|
|
// couldn't fit on a single block.
|
|
if (NumDirectoryBlocks > SB.BlockSize / sizeof(support::ulittle32_t))
|
|
return make_error<MSFError>(msf_error_code::invalid_format,
|
|
"Too many directory blocks.");
|
|
|
|
if (SB.BlockMapAddr == 0)
|
|
return make_error<MSFError>(msf_error_code::invalid_format,
|
|
"Block 0 is reserved");
|
|
|
|
if (SB.BlockMapAddr >= SB.NumBlocks)
|
|
return make_error<MSFError>(msf_error_code::invalid_format,
|
|
"Block map address is invalid.");
|
|
|
|
if (SB.FreeBlockMapBlock != 1 && SB.FreeBlockMapBlock != 2)
|
|
return make_error<MSFError>(
|
|
msf_error_code::invalid_format,
|
|
"The free block map isn't at block 1 or block 2.");
|
|
|
|
return Error::success();
|
|
}
|
|
|
|
MSFStreamLayout llvm::msf::getFpmStreamLayout(const MSFLayout &Msf,
|
|
bool IncludeUnusedFpmData,
|
|
bool AltFpm) {
|
|
MSFStreamLayout FL;
|
|
uint32_t NumFpmIntervals =
|
|
getNumFpmIntervals(Msf, IncludeUnusedFpmData, AltFpm);
|
|
|
|
uint32_t FpmBlock = AltFpm ? Msf.alternateFpmBlock() : Msf.mainFpmBlock();
|
|
|
|
for (uint32_t I = 0; I < NumFpmIntervals; ++I) {
|
|
FL.Blocks.push_back(support::ulittle32_t(FpmBlock));
|
|
FpmBlock += msf::getFpmIntervalLength(Msf);
|
|
}
|
|
|
|
if (IncludeUnusedFpmData)
|
|
FL.Length = NumFpmIntervals * Msf.SB->BlockSize;
|
|
else
|
|
FL.Length = divideCeil(Msf.SB->NumBlocks, 8);
|
|
|
|
return FL;
|
|
}
|