/*
** Take a string which is supposed to be an executable address,
** and find out what that address is.
*/
ULONG FindExecAddr(char *label, char **brkDesc)
{
ULONG addr = 0;
char *desc;
char *dummy;
ULONG lineNum;
DebugModule *module;
char funcName[MAX_FUNCNAME];
char sourceName[CCHMAXPATH];
/*
** If there is no label, give up the ghost!
*/
if(label == NULL)
return 0;
/*
** Find the address of the line given a line number.
*/
if(label[0] == '.') {
module = FindModule(debugBuffer.MTE, NULL);
FindSource(module, Linearize(debugBuffer.EIP, debugBuffer.CS),
funcName, sourceName, &lineNum);
/* Cannot find source module. */
if(strcmp(sourceName, "UNKNOWN") == 0) {
return 0;
}
lineNum = strtol(&label[1], &dummy, 0);
addr = FindSourceLine(module, lineNum, sourceName);
/*
** Build a string which describes the breakpoint.
*/
desc = malloc(strlen(label) + strlen(sourceName) + 1);
strcpy(desc, sourceName);
strcat(desc, ":");
strcat(desc, &label[1]);
*brkDesc = desc;
return addr;
}
/*
** If we have a '!' in the string, then it is a compound
** filename/line number
*/
if(strchr(label, '!') != NULL) {
char *line;
line = strchr(label, '!');
*line = '\0';
module = FindModule(debugBuffer.MTE, NULL);
FindSource(module, Linearize(debugBuffer.EIP, debugBuffer.CS),
funcName, sourceName, &lineNum);
/* Cannot find source module. */
if(strcmp(sourceName, "UNKNOWN") == 0) {
return 0;
}
lineNum = strtol(&label[1], &dummy, 0);
addr = FindSourceLine(module, lineNum, sourceName);
/*
** Build a string which describes the breakpoint.
*/
desc = malloc(strlen(label) + strlen(sourceName) + 1);
strcpy(desc, sourceName);
strcat(desc, ":");
strcat(desc, &label[1]);
*brkDesc = desc;
return addr;
}
/*
** Try finding the name as a function
*/
if((addr = FindFuncAddr(NULL, label)) != 0) {
desc = malloc(strlen(label) + 1);
strcpy(desc, label);
*brkDesc = desc;
return addr;
}
/*
** If we could not find a function, try using the label as
** a hex offset to break at.
*/
addr = StrToAddr(label, TOADDR_CODE);
desc = malloc(strlen(label) + 1);
strcpy(desc, label);
*brkDesc = desc;
return addr;
}
/*
** Do a single step to the next source instruction.
*/
int CommandStep(char **ptrs)
{
int i;
ULONG addr;
ULONG lineNum;
Breakpoint *bp;
DebugModule *module;
char funcName[MAX_FUNCNAME];
char funcName2[MAX_FUNCNAME];
char sourceName[CCHMAXPATH];
/*
** Provide a reference to keep from getting a compile warning.
*/
ptrs;
/*
** Find the address specified.
*/
module = FindModule(debugBuffer.MTE, NULL);
FindSource(module, Linearize(debugBuffer.EIP, debugBuffer.CS),
funcName, sourceName, &lineNum);
for(i=0; i<100; i++) {
lineNum++;
addr = FindSourceLine(module, lineNum, sourceName);
if(addr != 0) {
FindSource(module, addr, funcName2, sourceName, &lineNum);
if(strcmp(funcName2, funcName) == 0)
break;
fprintf(logFile, "Unable to find next line. Next function found!\n");
return -1;
}
}
/*
** Did we find a line
*/
if(addr == 0) {
fprintf(logFile, "Unable to find next line.\n");
return -1;
}
/*
** Set the breakpoint at the address specified.
*/
debugBuffer.Addr = addr;
debugBuffer.Len = 1;
debugBuffer.Index = 0;
debugBuffer.Value = DBG_W_Local | DBG_W_Execute;
DispatchCommand(DBG_C_SetWatch);
/*
** Add the breakpoint to the list, and tag it as a 'go'
** breakpoint which will unconditionally be cleared the
** next time we get back from the debuggee.
*/
if(Breakpoints) {
for(i=0, bp=Breakpoints; bp->next; i++, bp=bp->next) ;
bp->next = malloc(sizeof(Breakpoint));
bp = bp->next;
} else {
i = 0;
Breakpoints = bp = malloc(sizeof(Breakpoint));
}
bp->id = debugBuffer.Index;
bp->addr = addr;
bp->next = NULL;
bp->desc = NULL;
bp->oneTimeFlag = 1;
return DBG_C_Go;
}
/*
** Display the source file and line number.
*/
int DisplaySource(DebugModule *module, char *sourceName, int lineNum)
{
int i, lastChar, is32Bit;
int curLine;
FILE *file = NULL;
View *viewData = (View *) module->ViewData;
ULONG addr, addr2;
char buff[CCHMAXPATH];
char dummy[CCHMAXPATH];
/*
** Find out whether this is a 32 bit segment.
*/
DispatchCommand(DBG_C_ReadReg);
is32Bit = (debugBuffer.CSAtr & 0x80) != 0;
/*
** If the view data does not exist, create and initialize it.
*/
if(viewData == NULL) {
viewData = module->ViewData = calloc(sizeof(View), 1);
viewData->lastSource = strdup("");
viewData->basePath = strdup("");
}
/*
** Find and open the source file.
*/
if(strlen(sourceName) > 0) {
strcpy(buff, sourceName);
_splitpath(sourceName, drive, dir, fname, ext);
_splitpath(viewData->basePath, drive, dir, dummy, dummy);
_makepath(buff, drive, dir, fname, ext);
while((file = fopen(buff, "r")) == NULL) {
#ifdef SHERLOCK
buff[0] = 0;
#else
fprintf(logFile, "Please enter path for %s\n", sourceName);
fgets(buff, sizeof(buff), stdin);
#endif
while((strlen(buff) > 0) && isspace(*buff))
buff[strlen(buff) - 1] = 0;
if(strlen(buff) == 0)
return 0;
lastChar = strlen(buff) - 1;
while(isspace(buff[lastChar])) {
buff[lastChar] = 0;
lastChar--;
}
if((buff[lastChar] != '\\') && (buff[lastChar] != '/'))
strcat(buff, "/");
_splitpath(buff, drive, dir, dummy, dummy);
_makepath(buff, drive, dir, fname, ext);
}
}
/*
** Free/show the last source viewed.
*/
if(viewData->lastSource)
free(viewData->lastSource);
viewData->lastSource = strdup(buff);
/*
** Free the previous path spec.
*/
if(viewData->basePath)
free(viewData->basePath);
_splitpath(buff, drive, dir, fname, ext);
_makepath(buff, drive, dir, "", "");
viewData->basePath = strdup(buff);
/*
** Go to just before the line specific.
*/
if(file) {
curLine = 0;
for(curLine=1; curLine < lineNum - 5; curLine++) {
fgets(buff, sizeof(buff), file);
}
}
/*
** Now, display the source.
*/
if(file) {
for(i=0; i<10; i++, curLine++) {
if(file)
if(fgets(buff, sizeof(buff), file) == NULL)
break;
if(ShouldDumpSource) {
if(curLine == lineNum)
fprintf(logFile, "*%5d: %s", curLine, buff);
else
fprintf(logFile, " %5d: %s", curLine, buff);
}
if((addr = FindSourceLine(module, curLine, sourceName)) != 0) {
int j;
/*
** Find the next line.
*/
for(j=1; j < 10; j++) {
if((addr2=FindSourceLine(module,curLine+j,sourceName))!=0)
break;
}
}
if(addr2 == 0)
addr2 = addr + 0x10;
if(ShouldDumpAsm)
DumpAsm(addr, addr2-addr, is32Bit);
}
} else {
addr = Linearize(debugBuffer.EIP, debugBuffer.CS);
DumpAsm(addr, 0x20, is32Bit);
addr2 = addr + 0x20;
}
viewData->lastLine = curLine - 1;
viewData->lastAddr = addr2;
if(file)
fclose(file);
return 1;
}
/*
** View the assembler for the address/line specified.
*/
int CommandUnassemble(char **ptrs)
{
DebugModule *module;
View *viewData;
char *srcEnd;
ULONG addr;
int lineNum;
int is32Bit;
char sourceName[CCHMAXPATH];
/*
** Get the common data.
*/
module = FindModule(debugBuffer.MTE, NULL);
viewData = (View *) module->ViewData;
if(viewData == NULL) {
viewData = module->ViewData = calloc(sizeof(View), 1);
viewData->lastSource = strdup("");
viewData->basePath = strdup("");
}
is32Bit = (debugBuffer.CSAtr & 0x80) != 0;
addr = Linearize(debugBuffer.EIP, debugBuffer.CS);
/*
** View the next lines to be displayed.
*/
if(ptrs[2] == NULL) {
DumpAsm(viewData->lastAddr, 0x20, is32Bit);
viewData->lastAddr = addr + 0x20;
return -1;
}
/*
** View a source line.
*/
if(ptrs[2][0] == '.') {
/*
** Find the line number or the file name/line number
*/
if(isdigit(ptrs[2][1])) {
lineNum = atol(&ptrs[2][1]);
if(viewData->lastSource == NULL) {
fprintf(logFile, "No source yet displayed\n");
return -1;
}
strcpy(sourceName, viewData->lastSource);
} else {
strcpy(sourceName, &ptrs[2][1]);
*strrchr(sourceName, ':') = 0;
lineNum = atol(strrchr(ptrs[2], ':') + 1);
}
addr = FindSourceLine(module, lineNum, sourceName);
DumpAsm(addr, 0x20, is32Bit);
viewData->lastAddr = addr + 0x20;
return -1;
}
/*
** Get a view at a given offset.
*/
if(isxdigit(ptrs[2][0])) {
addr = StrToAddr(ptrs[2], TOADDR_CODE);
DumpAsm(addr, 0x20, is32Bit);
viewData->lastAddr = addr + 0x20;
return -1;
}
/*
** ERROR!
*/
fprintf(logFile, "Invalid syntax\n");
return -1;
}
void CDebugMgr::RecordException(PEXCEPTION_POINTERS pExceptionInfo)
{
PEXCEPTION_RECORD pExceptionRecord = pExceptionInfo->ExceptionRecord;
// First print information about the type of fault
m_pchBuffer += wsprintf(m_pchBuffer, "Exception code: %08X\n",
pExceptionRecord->ExceptionCode);
// Now print information about where the fault occured
TCHAR szFaultingModule[MAX_PATH]; DWORD section, offset;
FindLogicalAddress( pExceptionRecord->ExceptionAddress,
szFaultingModule,
sizeof( szFaultingModule ),
section, offset );
m_pchBuffer += wsprintf(m_pchBuffer,"Fault address: %08X %02X:%08X %s",
pExceptionRecord->ExceptionAddress,
section, offset, szFaultingModule );
TCHAR szMap[MAX_PATH] = "";
wsprintf(szMap, szFaultingModule);
wsprintf(&szMap[lstrlen(szMap)-3], "MAP");
TCHAR szSymbol[256] = "<unknown>";
TCHAR szUnmangledSymbol[1024] = "<unknown>";
TCHAR szObject[128] = "<unknown>";
if ( m_dwOptions & DEBUGMGR_RESOLVESYMBOLS )
{
if ( FindSymbol(szMap, section, offset, szSymbol, szObject) )
{
if ( m_dwOptions & DEBUGMGR_UNMANGLESYMBOLS && *szSymbol == '?' )
{
UnDecorateSymbolName(szSymbol, szUnmangledSymbol, 1024, UNDNAME_COMPLETE);
}
else
{
wsprintf(szUnmangledSymbol, szSymbol);
}
m_pchBuffer += wsprintf(m_pchBuffer, " in function %s in object file %s", szUnmangledSymbol, szObject);
if ( m_dwOptions & DEBUGMGR_RESOLVESOURCELINE )
{
TCHAR szSource[256];
TCHAR szLine[256];
if ( FindSourceLine(szMap, szObject, section, offset, szSource, szLine) )
{
m_pchBuffer += wsprintf(m_pchBuffer, " at Line %s of %s\n", szLine, szSource);
}
else
{
m_pchBuffer += wsprintf(m_pchBuffer, " at Line ??? of ???\n");
}
}
else
{
m_pchBuffer += wsprintf(m_pchBuffer, "\n\n");
}
}
else
{
m_pchBuffer += wsprintf(m_pchBuffer, "\n");
}
}
else
{
m_pchBuffer += wsprintf(m_pchBuffer, "\n");
}
PCONTEXT pCtx = pExceptionInfo->ContextRecord; // Show the registers
m_pchBuffer += wsprintf(m_pchBuffer, "EAX:%08X\nEBX:%08X\nECX:%08X\nEDX:%08X\nESI:%08X\nEDI:%08X\n",
pCtx->Eax, pCtx->Ebx, pCtx->Ecx, pCtx->Edx, pCtx->Esi, pCtx->Edi );
m_pchBuffer += wsprintf(m_pchBuffer,"CS:EIP:%04X:%08X\n", pCtx->SegCs, pCtx->Eip );
m_pchBuffer += wsprintf(m_pchBuffer,"SS:ESP:%04X:%08X EBP:%08X\n",
pCtx->SegSs, pCtx->Esp, pCtx->Ebp );
m_pchBuffer += wsprintf(m_pchBuffer,"DS:%04X ES:%04X FS:%04X GS:%04X\n",
pCtx->SegDs, pCtx->SegEs, pCtx->SegFs, pCtx->SegGs );
m_pchBuffer += wsprintf(m_pchBuffer,"Flags:%08X\n", pCtx->EFlags );
}
void CDebugMgr::RecordStack(const CONTEXT* pContext)
{
m_pchBuffer += wsprintf(m_pchBuffer,"\nCall stack:\n" );
m_pchBuffer += wsprintf(m_pchBuffer,"Address Frame Logical addr Module\n" );
DWORD pc = pContext->Eip;
PDWORD pFrame, pPrevFrame;
pFrame = (PDWORD)pContext->Ebp;
do
{
TCHAR szModule[MAX_PATH] = "";
DWORD section = 0, offset = 0;
FindLogicalAddress((PVOID)pc, szModule,sizeof(szModule),section,offset );
m_pchBuffer += wsprintf(m_pchBuffer,"%08X %08X %04X:%08X %s",
pc, pFrame, section, offset, szModule );
// See if we need to spit out symbol/source/line info
if ( m_dwOptions & DEBUGMGR_RESOLVESYMBOLS )
{
// Generate the name of the map file
TCHAR szMap[MAX_PATH] = "";
wsprintf(szMap, szModule);
wsprintf(&szMap[lstrlen(szMap)-3], "MAP");
TCHAR szSymbol[256] = "<unknown>";
TCHAR szUnmangledSymbol[1024] = "<unknown>";
TCHAR szObject[128] = "<unknown>";
if ( FindSymbol(szMap, section, offset, szSymbol, szObject) )
{
if ( m_dwOptions & DEBUGMGR_UNMANGLESYMBOLS && *szSymbol == '?' )
{
UnDecorateSymbolName(szSymbol, szUnmangledSymbol, 1024, UNDNAME_COMPLETE);
}
else
{
wsprintf(szUnmangledSymbol, szSymbol);
}
}
m_pchBuffer += wsprintf(m_pchBuffer, " in function %s in object file %s", szUnmangledSymbol, szObject);
if ( m_dwOptions & DEBUGMGR_RESOLVESOURCELINE )
{
TCHAR szSource[256];
TCHAR szLine[256];
if ( FindSourceLine(szMap, szObject, section, offset, szSource, szLine) )
{
m_pchBuffer += wsprintf(m_pchBuffer, " at Line %s of %s\n", szLine, szSource);
}
else
{
m_pchBuffer += wsprintf(m_pchBuffer, " at Line ??? of ???\n");
}
}
else
{
m_pchBuffer += wsprintf(m_pchBuffer, "\n\n");
}
}
else
{
m_pchBuffer += wsprintf(m_pchBuffer, "\n");
}
// Go on to the next stack frame
pc = pFrame[1];
pPrevFrame = pFrame;
pFrame = (PDWORD)pFrame[0]; // proceed to next higher frame on stack
if ( (DWORD)pFrame & 3 ) // Frame pointer must be aligned on a
break; // DWORD boundary. Bail if not so.
if ( pFrame <= pPrevFrame )
break;
// Can two DWORDs be read from the supposed frame address?
if ( IsBadWritePtr(pFrame, sizeof(PVOID)*2) )
break;
} while ( 1 );
}
