// Specific to BinaryFile objects that implement a "global pointer"
// Gets a pair of unsigned integers representing the address of %agp,
// and the value for GLOBALOFFSET. For Palm, the latter is the amount of
// space allocated below %a5, i.e. the difference between %a5 and %agp
// (%agp points to the bottom of the global data area).
std::pair<unsigned,unsigned> PalmBinaryFile::GetGlobalPointerInfo()
{
unsigned agp = 0;
const SectionInfo* ps = GetSectionInfoByName("data0");
if (ps) agp = ps->uNativeAddr;
std::pair<unsigned, unsigned> ret(agp, m_SizeBelowA5);
return ret;
}
// This is provided for completeness only...
std::list<SectionInfo*>& PalmBinaryFile::GetEntryPoints(const char* pEntry
/* = "main" */)
{
std::list<SectionInfo*>* ret = new std::list<SectionInfo*>;
SectionInfo* pSect = GetSectionInfoByName("code1");
if (pSect == 0)
return *ret; // Failed
ret->push_back(pSect);
return *ret;
}
// This is provided for completeness only...
std::list<SectionInfo*>& ExeBinaryFile::GetEntryPoints(const char* pEntry
/* = "main"*/) {
std::list<SectionInfo*>* ret = new std::list<SectionInfo*>;
#if 0 // Copied from PalmBinaryFile.cc
SectionInfo* pSect = GetSectionInfoByName("code1");
if (pSect == 0)
return *ret; // Failed
ret->push_back(pSect);
#endif
return *ret;
}
// Find the native address for the start of the main entry function.
// For Palm binaries, this is PilotMain.
ADDRESS PalmBinaryFile::GetMainEntryPoint()
{
SectionInfo* pSect = GetSectionInfoByName("code1");
if (pSect == 0)
return 0; // Failed
// Return the start of the code1 section
SWord* startCode = (SWord*) pSect->uHostAddr;
ptrdiff_t delta = pSect->uHostAddr - (unsigned char *)pSect->uNativeAddr;
// First try the CW first jump pattern
SWord* res = findPattern(startCode, CWFirstJump,
sizeof(CWFirstJump) / sizeof(SWord), 1);
if (res)
{
// We have the code warrior first jump. Get the addil operand
int addilOp = (startCode[5] << 16) + startCode[6];
SWord* startupCode = (SWord*)((unsigned char *)startCode + 10 + addilOp);
// Now check the next 60 SWords for the call to PilotMain
res = findPattern(startupCode, CWCallMain,
sizeof(CWCallMain) / sizeof(SWord), 60);
if (res)
{
// Get the addil operand
addilOp = (res[5] << 16) + res[6];
// That operand plus the address of that operand is PilotMain
return (ADDRESS)res + 10 + addilOp - delta;
}
else
{
fprintf( stderr, "Could not find call to PilotMain in CW app\n" );
return 0;
}
}
// Check for gcc call to main
res = findPattern(startCode, GccCallMain,
sizeof(GccCallMain) / sizeof(SWord), 75);
if (res)
{
// Get the operand to the bsr
SWord bsrOp = res[7];
return (ADDRESS)res + 14 + bsrOp - delta;
}
fprintf(stderr,"Cannot find call to PilotMain\n");
return 0;
}
ADDRESS DOS4GWBinaryFile::GetMainEntryPoint() {
ADDRESS aMain = GetAddressByName ("main", true);
if (aMain != NO_ADDRESS)
return aMain;
aMain = GetAddressByName ("__CMain", true);
if (aMain != NO_ADDRESS)
return aMain;
// Search with this crude pattern: call, sub ebp, ebp, call __Cmain in the first 0x300 bytes
// Start at program entry point
unsigned p = LMMH(m_pLXHeader->eip);
unsigned lim = p + 0x300;
unsigned char op1, op2;
ADDRESS addr;
//unsigned lastOrdCall = 0; //TODO: identify the point of setting this variable
bool gotSubEbp = false; // True if see sub ebp, ebp
bool lastWasCall = false; // True if the last instruction was a call
SectionInfo* si = GetSectionInfoByName("seg0"); // Assume the first section is text
if (si == nullptr) si = GetSectionInfoByName(".text");
if (si == nullptr) si = GetSectionInfoByName("CODE");
assert(si);
ADDRESS nativeOrigin = si->uNativeAddr;
unsigned textSize = si->uSectionSize;
if (textSize < 0x300)
lim = p + textSize;
while (p < lim) {
op1 = *(unsigned char*)(p + base);
op2 = *(unsigned char*)(p + base + 1);
//std::cerr << std::hex << "At " << p << ", ops " << (unsigned)op1 << ", " << (unsigned)op2 << std::dec << "\n";
switch (op1) {
case 0xE8: {
// An ordinary call
if (gotSubEbp) {
// This is the call we want. Get the offset from the call instruction
addr = nativeOrigin + p + 5 + LMMH(*(p + base + 1));
// std::cerr << "__CMain at " << std::hex << addr << "\n";
return addr;
}
//lastOrdCall = p;
lastWasCall = true;
break;
}
case 0x2B: // 0x2B 0xED is sub ebp,ebp
if (op2 == 0xED && lastWasCall)
gotSubEbp = true;
lastWasCall = false;
break;
default:
gotSubEbp = false;
lastWasCall = false;
break;
case 0xEB: // Short relative jump
if (op2 >= 0x80) // Branch backwards?
break; // Yes, just ignore it
// Otherwise, actually follow the branch. May have to modify this some time...
p += op2+2; // +2 for the instruction itself, and op2 for the displacement
continue; // Don't break, we have the new "pc" set already
}
int size = microX86Dis(p + base);
if (size == 0x40) {
fprintf(stderr, "Warning! Microdisassembler out of step at offset 0x%x\n", p);
size = 1;
}
p += size;
}
return NO_ADDRESS;
}
bool PalmBinaryFile::RealLoad(const char* sName)
{
FILE *fp;
char buf[32];
m_pFileName = sName;
if ((fp = fopen(sName, "rb")) == NULL)
{
fprintf(stderr, "Could not open binary file %s\n", sName);
return false;
}
fseek(fp, 0, SEEK_END);
long size = ftell(fp);
// Allocate a buffer for the image
m_pImage = new unsigned char[size];
if (m_pImage == 0)
{
fprintf(stderr, "Could not allocate %ld bytes for image\n", size);
return false;
}
memset(m_pImage, size, 0);
fseek(fp, 0, SEEK_SET);
if (fread(m_pImage, 1, size, fp) != (unsigned)size)
{
fprintf(stderr, "Error reading binary file %s\n", sName);
return false;
}
// Check type at offset 0x3C; should be "appl" (or "palm"; ugh!)
if ((strncmp((char*)(m_pImage+0x3C), "appl", 4) != 0) &&
(strncmp((char*)(m_pImage+0x3C), "panl", 4) != 0) &&
(strncmp((char*)(m_pImage+0x3C), "libr", 4) != 0))
{
fprintf(stderr, "%s is not a standard .prc file\n", sName);
return false;
}
// Get the number of resource headers (one section per resource)
m_iNumSections = (m_pImage[0x4C] << 8) + m_pImage[0x4D];
// Allocate the section information
m_pSections = new SectionInfo[m_iNumSections];
if (m_pSections == 0)
{
fprintf(stderr, "Could not allocate section info array of %d items\n",
m_iNumSections);
if (m_pImage)
{
delete m_pImage;
m_pImage = 0;
}
}
// Iterate through the resource headers (generating section info structs)
unsigned char* p = m_pImage + 0x4E; // First resource header
unsigned off = 0;
for (int i=0; i < m_iNumSections; i++)
{
// First get the name (4 alpha)
strncpy(buf, (char*)p, 4);
buf[4] = '\0';
std::string name(buf);
// Now get the identifier (2 byte binary)
unsigned id = (p[4] << 8) + p[5];
sprintf(buf, "%d", id);
// Join the id to the name, e.g. code0, data12
name += buf;
m_pSections[i].pSectionName = new char[name.size()+1];
strcpy(m_pSections[i].pSectionName, name.c_str());
p += 4+2;
off = UINT4(p);
p += 4;
m_pSections[i].uNativeAddr = off;
m_pSections[i].uHostAddr = off + m_pImage;
// Guess the length
if (i > 0)
{
m_pSections[i-1].uSectionSize = off - m_pSections[i-1].uNativeAddr;
m_pSections[i].uSectionEntrySize = 1; // No info available
}
// Decide if code or data; note that code0 is a special case (not code)
m_pSections[i].bCode =
(name != "code0") && (name.substr(0, 4) == "code");
m_pSections[i].bData = name.substr(0, 4) == "data";
}
// Set the length for the last section
m_pSections[m_iNumSections-1].uSectionSize = size - off;
// Create a separate, uncompressed, initialised data section
SectionInfo* pData = GetSectionInfoByName("data0");
if (pData == 0)
{
fprintf(stderr, "No data section!\n");
return false;
}
SectionInfo* pCode0 = GetSectionInfoByName("code0");
if (pCode0 == 0)
{
fprintf(stderr, "No code 0 section!\n");
return false;
}
// When the info is all boiled down, the two things we need from the
// code 0 section are at offset 0, the size of data above a5, and at
// offset 4, the size below. Save the size below as a member variable
m_SizeBelowA5 = UINT4(pCode0->uHostAddr+4);
// Total size is this plus the amount above (>=) a5
unsigned sizeData = m_SizeBelowA5 + UINT4(pCode0->uHostAddr);
// Allocate a new data section
m_pData = new unsigned char[sizeData];
if (m_pData == 0)
{
fprintf(stderr, "Could not allocate %u bytes for data section\n",
sizeData);
}
// Uncompress the data. Skip first long (offset of CODE1 "xrefs")
p = (unsigned char*)(pData->uHostAddr+4);
int start = (int) UINT4(p);
p += 4;
unsigned char* q = (m_pData + m_SizeBelowA5 + start);
bool done = false;
while (!done && (p < (unsigned char*)(pData->uHostAddr +
pData->uSectionSize)))
{
unsigned char rle = *p++;
if (rle == 0)
{
done = true;
break;
}
else if (rle == 1)
{
// 0x01 b_0 b_1
// => 0x00 0x00 0x00 0x00 0xFF 0xFF b_0 b_1
*q++ = 0;
*q++ = 0;
*q++ = 0;
*q++ = 0;
*q++ = 0xFF;
*q++ = 0xFF;
*q++ = *p++;
*q++ = *p++;
}
else if (rle == 2)
{
// 0x02 b_0 b_1 b_2
// => 0x00 0x00 0x00 0x00 0xFF b_0 b_1 b_2
*q++ = 0;
*q++ = 0;
*q++ = 0;
*q++ = 0;
*q++ = 0xFF;
*q++ = *p++;
*q++ = *p++;
*q++ = *p++;
}
else if (rle == 3)
{
// 0x03 b_0 b_1 b_2
// => 0xA9 0xF0 0x00 0x00 b_0 b_1 0x00 b_2
*q++ = 0xA9;
*q++ = 0xF0;
*q++ = 0;
*q++ = 0;
*q++ = *p++;
*q++ = *p++;
*q++ = 0;
*q++ = *p++;
}
else if (rle == 4)
{
// 0x04 b_0 b_1 b_2 b_3
// => 0xA9 axF0 0x00 b_0 b_1 b_3 0x00 b_3
*q++ = 0xA9;
*q++ = 0xF0;
*q++ = 0;
*q++ = *p++;
*q++ = *p++;
*q++ = *p++;
*q++ = 0;
*q++ = *p++;
}
else if (rle < 0x10)
{
// 5-0xF are invalid.
assert(0);
}
else if (rle >= 0x80)
{
// n+1 bytes of literal data
for (int k=0; k <= (rle-0x80); k++)
*q++ = *p++;
}
else if (rle >= 40)
{
// n+1 repetitions of 0
for (int k=0; k <= (rle-0x40); k++)
*q++ = 0;
}
else if (rle >= 20)
{
// n+2 repetitions of b
unsigned char b = *p++;
for (int k=0; k < (rle-0x20+2); k++)
*q++ = b;
}
else
{
// 0x10: n+1 repetitions of 0xFF
for (int k=0; k <= (rle-0x10); k++)
*q++ = 0xFF;
}
}
if (!done)
fprintf(stderr, "Warning! Compressed data section premature end\n");
//printf("Used %u bytes of %u in decompressing data section\n",
//p-(unsigned char*)pData->uHostAddr, pData->uSectionSize);
// Replace the data pointer and size with the uncompressed versions
pData->uHostAddr = m_pData;
pData->uSectionSize = sizeData;
// May as well make the native address zero; certainly the offset in the
// file is no longer appropriate (and is confusing)
pData->uNativeAddr = 0;
return true;
}
