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// Convert DMD CodeView debug information to PDB files
// Copyright (c) 2009 by Rainer Schuetze, All Rights Reserved
//
// License for redistribution is given by the Artistic License 2.0
// see file LICENSE for further details
#include "PEImage.h"
extern "C" {
#include "mscvpdb.h"
}
#include <stdio.h>
#include <io.h>
#include <fcntl.h>
#include <ctype.h>
#include <direct.h>
#include <sys/stat.h>
///////////////////////////////////////////////////////////////////////
PEImage::PEImage(const char* iname)
: dump_base(0)
, dump_total_len(0)
, dirHeader(0)
, fd(-1)
{
if(iname)
load(iname);
}
PEImage::~PEImage()
{
if(fd != -1)
close(fd);
if(dump_base)
free_aligned(dump_base);
}
///////////////////////////////////////////////////////////////////////
bool PEImage::load(const char* iname)
{
if (fd != -1)
return setError("file already open");
fd = open(iname, O_RDONLY | O_BINARY);
if (fd == -1)
return setError("Can't open file");
struct stat s;
if (fstat(fd, &s) < 0)
return setError("Can't get size");
dump_total_len = s.st_size;
dump_base = alloc_aligned(dump_total_len, 0x1000);
if (!dump_base)
return setError("Out of memory");
if (read(fd, dump_base, dump_total_len) != dump_total_len)
return setError("Cannot read file");
close(fd);
fd = -1;
return initPtr(true);
}
///////////////////////////////////////////////////////////////////////
bool PEImage::save(const char* oname)
{
if (fd != -1)
return setError("file already open");
if (!dump_base)
return setError("no data to dump");
fd = open(oname, O_WRONLY | O_CREAT | O_BINARY | O_TRUNC, S_IREAD | S_IWRITE | S_IEXEC);
if (fd == -1)
return setError("Can't create file");
if (write(fd, dump_base, dump_total_len) != dump_total_len)
return setError("Cannot write file");
close(fd);
fd = -1;
return true;
}
///////////////////////////////////////////////////////////////////////
bool PEImage::replaceDebugSection (const void* data, int datalen)
{
// append new debug directory to data
IMAGE_DEBUG_DIRECTORY debugdir = *dbgDir;
int xdatalen = datalen + sizeof(debugdir);
// assume there is place for another section because of section alignment
int s;
DWORD lastVirtualAddress = 0;
for(s = 0; s < hdr->FileHeader.NumberOfSections; s++)
{
if (strcmp ((char*) sec [s].Name, ".debug") == 0)
{
if (s == hdr->FileHeader.NumberOfSections - 1)
{
dump_total_len = sec[s].PointerToRawData;
break;
}
strcpy ((char*) sec [s].Name, ".ddebug");
printf("warning: .debug not last section, cannot remove section\n");
}
lastVirtualAddress = sec [s].VirtualAddress + sec[s].Misc.VirtualSize;
}
int align = hdr->OptionalHeader.FileAlignment;
int align_len = xdatalen;
int fill = 0;
if (align > 0)
{
fill = (align - (dump_total_len % align)) % align;
align_len = ((xdatalen + align - 1) / align) * align;
}
char* newdata = (char*) alloc_aligned(dump_total_len + fill + xdatalen, 0x1000);
if(!newdata)
return setError("cannot alloc new image");
int salign_len = xdatalen;
align = hdr->OptionalHeader.SectionAlignment;
if (align > 0)
{
lastVirtualAddress = ((lastVirtualAddress + align - 1) / align) * align;
salign_len = ((xdatalen + align - 1) / align) * align;
}
strcpy((char*) sec[s].Name, ".debug");
sec[s].Misc.VirtualSize = align_len; // union with PhysicalAddress;
sec[s].VirtualAddress = lastVirtualAddress;
sec[s].SizeOfRawData = xdatalen;
sec[s].PointerToRawData = dump_total_len + fill;
sec[s].PointerToRelocations = 0;
sec[s].PointerToLinenumbers = 0;
sec[s].NumberOfRelocations = 0;
sec[s].NumberOfLinenumbers = 0;
sec[s].Characteristics = IMAGE_SCN_MEM_WRITE | IMAGE_SCN_MEM_READ | IMAGE_SCN_MEM_DISCARDABLE | IMAGE_SCN_CNT_INITIALIZED_DATA;
hdr->FileHeader.NumberOfSections = s + 1;
// hdr->OptionalHeader.SizeOfImage += salign_len;
hdr->OptionalHeader.SizeOfImage = sec[s].VirtualAddress + salign_len;
hdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG].VirtualAddress = lastVirtualAddress + datalen;
// append debug data chunk to existing file image
memcpy(newdata, dump_base, dump_total_len);
memset(newdata + dump_total_len, 0, fill);
memcpy(newdata + dump_total_len + fill, data, datalen);
dbgDir = (IMAGE_DEBUG_DIRECTORY*) (newdata + dump_total_len + fill + datalen);
memcpy(dbgDir, &debugdir, sizeof(debugdir));
dbgDir->PointerToRawData = sec[s].PointerToRawData;
dbgDir->AddressOfRawData = sec[s].PointerToRawData;
dbgDir->SizeOfData = sec[s].SizeOfRawData;
free_aligned(dump_base);
dump_base = newdata;
dump_total_len += fill + xdatalen;
return initPtr(false);
}
///////////////////////////////////////////////////////////////////////
bool PEImage::initPtr(bool initDbgDir)
{
dos = DPV<IMAGE_DOS_HEADER> (0);
if(!dos)
return setError("file too small for DOS header");
if(dos->e_magic != IMAGE_DOS_SIGNATURE)
return setError("this is not a DOS executable");
hdr = DPV<IMAGE_NT_HEADERS32> (dos->e_lfanew);
if(!hdr)
return setError("no optional header found");
if(hdr->Signature != IMAGE_NT_SIGNATURE)
return setError("optional header does not have PE signature");
if(hdr->FileHeader.SizeOfOptionalHeader < sizeof(IMAGE_OPTIONAL_HEADER32))
return setError("optional header too small");
sec = IMAGE_FIRST_SECTION(hdr);
if(hdr->OptionalHeader.NumberOfRvaAndSizes <= IMAGE_DIRECTORY_ENTRY_DEBUG)
return setError("too few entries in data directory");
if(hdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG].Size != 0x1c)
return setError("unexpected size of DEBUG data directory entry");
int off = hdr->OptionalHeader.DataDirectory[IMAGE_DIRECTORY_ENTRY_DEBUG].VirtualAddress;
dbgDir = RVA<IMAGE_DEBUG_DIRECTORY>(off, 0x1c);
if (!dbgDir)
return setError("debug directory not placed in image");
if (dbgDir->Type != IMAGE_DEBUG_TYPE_CODEVIEW)
return setError("debug directory not of type CodeView");
cv_base = dbgDir->PointerToRawData;
OMFSignature* sig = DPV<OMFSignature>(cv_base, dbgDir->SizeOfData);
if (!sig)
return setError("invalid debug data base address and size");
if (memcmp(sig->Signature, "NB09", 4) != 0 && memcmp(sig->Signature, "NB11", 4) != 0)
{
// return setError("can only handle debug info of type NB09 and NB11");
dirHeader = 0;
dirEntry = 0;
return true;
}
dirHeader = CVP<OMFDirHeader>(sig->filepos);
if (!dirHeader)
return setError("invalid cv dir header data base address");
dirEntry = CVP<OMFDirEntry>(sig->filepos + dirHeader->cbDirHeader);
if (!dirEntry)
return setError("cv debug dir entries invalid");
//if (dirHeader->cDir == 0)
// return setError("cv debug dir has no entries");
return true;
}
///////////////////////////////////////////////////////////////////////
int PEImage::countCVEntries() const
{
return dirHeader ? dirHeader->cDir : 0;
}
OMFDirEntry* PEImage::getCVEntry(int i) const
{
return dirEntry + i;
}
///////////////////////////////////////////////////////////////////////
// utilities
void* PEImage::alloc_aligned(unsigned int size, unsigned int align, unsigned int alignoff)
{
if (align & (align - 1))
return 0;
unsigned int pad = align + sizeof(void*);
char* p = (char*) malloc(size + pad);
unsigned int off = (align + alignoff - sizeof(void*) - (p - (char*) 0)) & (align - 1);
char* q = p + sizeof(void*) + off;
((void**) q)[-1] = p;
return q;
}
///////////////////////////////////////////////////////////////////////
void PEImage::free_aligned(void* p)
{
void* q = ((void**) p)[-1];
free(q);
}
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