* symbolizer: follow global variables from known functions to identify the unknown ones

git-svn-id: http://wiiqt.googlecode.com/svn/trunk@112 389f4c8b-5dfe-645f-db0e-df882bc27289

symbolizer/main.cpp

@@ -2,6 +2,7 @@
 
 #include "dol.h"
 #include "elfparser.h"
+#include "ppc_disasm.h"
 #include "../WiiQt/includes.h"
 #include "../WiiQt/tools.h"
 
@@ -30,6 +31,16 @@ struct KnownFunction
 	}
 };
 
+#define GLOBALVAR_MASK( x )		( (quint32)( x & ( PPCAMASK | 0xffff ) ) )
+// keep track of known rtoc & r13 references
+struct KnownVariable
+{
+	quint32 sig;							// signature for opcodes dealing with this variable when GLOBALVAR_MASK()'d
+											//! given lwz     %r0, -0x5460(%r13), it will store the -0x5460(%r13)
+	QString name;							// symbol name
+	ElfParser::File *file;					// pointer to the file object that contains the data
+};
+
 // holds the info about a dol to use while searching for crap in it
 Dol dol;
 QStringList dolTextHex;// store a copy of the dol as hex  for easier searching for patterns
@@ -42,15 +53,33 @@ QList< ElfParser::File > libFiles;
 QList< KnownData > knownData;
 QList< KnownFunction > knownFunctions;
 
+// keep track of variables accessed through r2 and r13
+QList< KnownVariable > knownVariables;
+
 // keep a list of the locations that each function's pattern matched to keep from looking them up over and over
 QMap< const ElfParser::Function *, QList< quint32 > >patternMatches;
 
+#define DU32( x ) qDebug().nospace() << #x << ": " << hex << (x)
+
 QString NStr( quint32 num, quint8 width = 8 );
 QString NStr( quint32 num, quint8 width )
 {
 	return QString( "%1" ).arg( num, width, 16, QChar( '0' ) );
 }
 
+bool IsVariableKnown( quint32 sig, const QList< KnownVariable > &list = knownVariables );
+bool IsVariableKnown( quint32 sig, const QList< KnownVariable > &list )
+{
+	foreach( const KnownVariable &var, list )
+	{
+		if( var.sig == sig )
+		{
+			return true;
+		}
+	}
+	return false;
+}
+
 // read dol into memory
 bool LoadDol( const QString &path )
 {
@@ -942,6 +971,177 @@ void TryToMatchFunctions1()
 	RemoveOverlaps();
 }
 
+void FindGlobalVariables()
+{
+	QList< QPair< const ElfParser::Function *, const KnownData *> > maybeMatches;// keep track of functions to check
+	//QList< QPair< QPair< const ElfParser::Function *, const KnownData *> *, const SymAlias * > > aliasMatches;// keep track of functions to check via aliases
+
+	QMap< const ElfParser::Function *, const ElfParser::File * >fileMap;
+	QMap< const ElfParser::Function *, quint32 >winners;
+
+	QList< KnownVariable > newVariables;
+
+	foreach( const KnownFunction &kf1, knownFunctions )// look in all known functions for global variables
+	{
+		if( !kf1.file )
+		{
+			continue;
+		}
+		foreach( const SymRef &ref, kf1.function->References() )
+		{
+			if( ref.type != SymRef::R_PPC_EMB_SDA21 )
+			{
+				continue;
+			}
+			quint32 addr = kf1.addr + ( ref.off & ~3 );
+			quint32 opcode = GetOpcodeFromAddr( addr );
+			if( opcode == 0xdeadbeef )
+			{
+				DBG << "opcode" << hex << opcode;
+				continue;
+			}
+			quint32 reg = (quint32)PPCGETA( opcode );
+			if( reg != 2 && reg != 13 )
+			{
+				DBG << "reg:" << hex << reg << kf1.function->Name() << ref.name;
+				continue;
+			}
+			quint32 sig = GLOBALVAR_MASK( opcode );
+			if( IsVariableKnown( sig, newVariables ) || IsVariableKnown( sig ) )
+			{
+				continue;
+			}
+			KnownVariable nw;
+			nw.file = (ElfParser::File *)kf1.file;
+			nw.name = ref.name;
+			nw.sig = sig;
+			newVariables << nw;
+
+			/*qDebug() << "opcode" << hex << opcode << "addr" << addr;
+			qDebug() << kf1.function->Name() << ref.name;
+			qDebug();
+			quint32 z = GLOBALVAR_MASK( opcode );
+			opcode = z;
+			quint32 s = (quint32)PPCGETD( opcode );
+			quint32 a = (quint32)PPCGETA( opcode );
+			quint32 d = (quint32)( opcode & 0xffff );
+			quint32 o = (quint32)( PPCGETIDX( opcode ) - 32 );
+			DU32( o );
+			DU32( d );
+			DU32( s );
+			DU32( a );*/
+			//exit( 0 );
+		}
+	}
+
+	// look at all the variables and see if there is an unknown function in that file that refers to the variable
+
+	QList< const ElfParser::Function * > bitches;
+	foreach( const KnownVariable &var, newVariables )
+	{
+		foreach( const ElfParser::Function &fun, var.file->Functions() )
+		{
+			if( FunctionIsKnown( &fun ) )
+			{
+				continue;
+			}
+			foreach( const SymRef &ref, fun.References() )
+			{
+				if( ref.type != SymRef::R_PPC_EMB_SDA21 )
+				{
+					continue;
+				}
+				if( ref.name != var.name )
+				{
+					continue;
+				}
+				if( !bitches.contains( &fun ) )
+				{
+					bitches << &fun;
+					fileMap[ &fun ] = var.file;
+				}
+			}
+		}
+	}
+
+	// now look at all the references to global variables in each found function and if it refers to a known one,
+	// check the opcode and see that it is correct
+	QMapIterator< const ElfParser::Function *, const ElfParser::File * > it( fileMap );
+	while( it.hasNext() )
+	{
+		it.next();
+		QList< quint32 > addrs = PatternMatches( it.key() );
+		quint32 winner = 0;
+		bool functionFailed = false;
+		foreach( quint32 addr, addrs )
+		{
+			bool fail = false;
+			foreach( const SymRef &ref, it.key()->References() )
+			{
+				if( ref.type != SymRef::R_PPC_EMB_SDA21 )
+				{
+					continue;
+				}
+				quint32 varSig = 0xb00b5;
+				foreach( const KnownVariable &kv, newVariables )
+				{
+					if( kv.file == it.value() && kv.name == ref.name )
+					{
+						varSig = kv.sig;
+						break;
+					}
+				}
+				if( varSig == 0xb00b5 )// we dont know this variable
+				{
+					continue;
+				}
+				quint32 opAddr = addr + ( ref.off & ~3 );
+				quint32 opcode = GetOpcodeFromAddr( opAddr );
+				if( opcode == 0xdeadbeef )
+				{
+					DBG << "opcode" << hex << opcode;
+					continue;
+				}
+				if( GLOBALVAR_MASK( opcode ) != varSig )
+				{
+					fail = true;
+					break;
+				}
+			}
+			if( fail )
+			{
+				continue;
+			}
+			if( winner )// found more than 1 match for this little guy
+			{
+				functionFailed = true;
+				break;
+			}
+			winner = addr;
+		}
+		if( winner && !functionFailed )
+		{
+			winners[ it.key() ] = winner;
+		}
+	}
+
+	knownVariables << newVariables;
+
+	//DBG << "added these bad boys";
+	QMapIterator< const ElfParser::Function *, quint32 > ret( winners );
+	while( ret.hasNext() )
+	{
+		ret.next();
+		//qDebug() << hex << ret.value()
+		//		 << NStr( ret.key()->Pattern().size() / 2, 4 )
+		//		 << ret.key()->Name()
+		//		 << fileMap.find( ret.key() ).value()->Name();
+		AddFunctionToKnownList( ret.key(), fileMap.find( ret.key() ).value(), ret.value() );
+	}
+	RemoveOverlaps();
+
+}
+
 void TryToMatchFunctions2( QMap< const ElfParser::Function *, quint32 > &nonMatchingBranches )
 {
 	QStringList wholeDolHex = dolDataHex + dolTextHex;
@@ -1290,11 +1490,11 @@ QList< QPair< const ElfParser::Function *, quint32> > TryToMatchFunctions4( QLis
 	// cleanup the list
 	CleanupList( maybeMatches );
 	int s = maybeMatches.size();
-	qDebug() << "Functions that only have 1 pattern match, contain wildcards, and are larger than 0x" << hex << minLen << "bytes:";
+	//qDebug() << "Functions that only have 1 pattern match, contain wildcards, and are larger than 0x" << hex << minLen << "bytes:";
 	for( int i = 0; i < s; i++ )
 	{
 		const QPair< const ElfParser::Function *, quint32 > &p = maybeMatches.at( i );
-		qDebug() << hex << p.second << NStr( p.first->Pattern().size() / 2, 4 ) << p.first->Name();
+		//qDebug() << hex << p.second << NStr( p.first->Pattern().size() / 2, 4 ) << p.first->Name();
 
 		AddFunctionToKnownList( p.first, fileMap.find( p.first ).value(), p.second );
 	}
@@ -1518,8 +1718,10 @@ int main(int argc, char *argv[])
 	//dolPath = "/home/j/c/hackmiiHaxx/disassembly/mem1-decrypt_60.bin";
 	//libPath = "/home/j/devkitPRO/libogc/lib/wii";
 
+	//dolPath = "/home/j/c/WiiQt/93/symbolizer/00000043_60.dol";
 	//dolPath = "/home/j/c/WWE12_haxx/main.dol";
 	//libPath = "/home/j/devkitPRO/libogc/lib/wii";
+	//libPath += "/os.a";
 
 	qDebug() << "Loading dol...";
 	if( !LoadDol( dolPath ) )
@@ -1544,9 +1746,15 @@ int main(int argc, char *argv[])
 	// find first round of functions
 	TryToMatchFunctions1();
 
+	// add functions by looking at rtoc and r13
+	FindGlobalVariables();
+	//exit( 0 );
+
 	// find branches from the first round of functions
 	TryToMatchFunctions2( nonMatchingBranches );
 
+	FindGlobalVariables();
+
 	// looking for functions that dont branch anywhere or use global variables or anything
 	TryToMatchFunctions0();
 
@@ -1565,6 +1773,11 @@ int main(int argc, char *argv[])
 		qDebug() << " - added" << newFunctions.size() << "new functions -";
 	}
 
+	// add functions by looking at rtoc and r13
+	FindGlobalVariables();
+
+
+
 	qDebug() << "Total functions found:" << knownFunctions.size();
 
 	// find branches from the known functions
@@ -1591,9 +1804,12 @@ int main(int argc, char *argv[])
 	num = knownFunctions.size();
 	for( int i = 0; i < maxRetries; i++ )
 	{
-		qDebug() << " -- Round" << i << '/' << maxRetries << " following branches --";
+		qDebug() << " -- Round" << i << '/' << maxRetries << " following branches and global variables --";
 		TryToMatchFunctions2( nonMatchingBranches );
 
+		// add functions by looking at rtoc and r13
+		FindGlobalVariables();
+
 		int num2 = knownFunctions.size();
 		if( num2 == num )
 		{
@@ -1603,6 +1819,7 @@ int main(int argc, char *argv[])
 		num = num2;
 	}
 
+	qDebug() << "Total global variables: " << knownVariables.size();
 	qDebug() << "Total data matches:     " << knownData.size();
 	qDebug() << "Total functions found:  " << knownFunctions.size();
 

symbolizer/ppc_disasm.h

@@ -0,0 +1,143 @@
+/* $VER: ppc_disasm.h V1.4 (29.08.2001)
+ *
+ * Disassembler module for the PowerPC microprocessor family
+ * Copyright (c) 1998-2001  Frank Wille
+ *
+ * ppc_disasm.c is freeware and may be freely redistributed as long as
+ * no modifications are made and nothing is charged for it.
+ * Non-commercial usage is allowed without any restrictions.
+ * EVERY PRODUCT OR PROGRAM DERIVED DIRECTLY FROM MY SOURCE MAY NOT BE
+ * SOLD COMMERCIALLY WITHOUT PERMISSION FROM THE AUTHOR.
+ *
+ *
+ * v1.4  (29.08.2001) phx
+ *       AltiVec support.
+ * v0.1  (23.05.1998) phx
+ *       First version, which implements all PowerPC instructions.
+ * v0.0  (09.05.1998) phx
+ *       File created.
+ */
+
+
+#ifndef PPC_DISASM_H
+#define PPC_DISASM_H
+
+#define PPC_GEKKO
+
+/* version/revision */
+#define PPCDISASM_VER 1
+#define PPCDISASM_REV 4
+
+
+/* typedefs */
+typedef unsigned int ppc_word;
+#ifndef NULL
+#define NULL (0L)
+#endif
+
+
+/* endianess */
+#define LITTLEENDIAN
+#endif
+
+#if !defined(BIGENDIAN) && !defined(LITTLEENDIAN)
+#error Define either BIGENDIAN or LITTLEENDIAN!
+#define LITTLEENDIAN
+#endif
+
+
+/* general defines */
+#define PPCIDXMASK      0xfc000000
+#define PPCIDX2MASK     0x000007fe
+#define PPCDMASK        0x03e00000
+#define PPCAMASK        0x001f0000
+#define PPCBMASK        0x0000f800
+#define PPCCMASK        0x000007c0
+#define PPCMMASK        0x0000003e
+#define PPCCRDMASK      0x03800000
+#define PPCCRAMASK      0x001c0000
+#define PPCLMASK        0x00600000
+#define PPCOE           0x00000400
+#define PPCVRC          0x00000400
+#define PPCDST          0x02000000
+#define PPCSTRM         0x00600000
+
+#define PPCIDXSH        26
+#define PPCDSH          21
+#define PPCASH          16
+#define PPCBSH          11
+#define PPCCSH          6
+#define PPCMSH          1
+#define PPCCRDSH        23
+#define PPCCRASH        18
+#define PPCLSH          21
+#define PPCIDX2SH       1
+
+#define PPCGETIDX(x)    (((x)&PPCIDXMASK)>>PPCIDXSH)
+#define PPCGETD(x)      (((x)&PPCDMASK)>>PPCDSH)
+#define PPCGETA(x)      (((x)&PPCAMASK)>>PPCASH)
+#define PPCGETB(x)      (((x)&PPCBMASK)>>PPCBSH)
+#define PPCGETC(x)      (((x)&PPCCMASK)>>PPCCSH)
+#define PPCGETM(x)      (((x)&PPCMMASK)>>PPCMSH)
+#define PPCGETCRD(x)    (((x)&PPCCRDMASK)>>PPCCRDSH)
+#define PPCGETCRA(x)    (((x)&PPCCRAMASK)>>PPCCRASH)
+#define PPCGETL(x)      (((x)&PPCLMASK)>>PPCLSH)
+#define PPCGETIDX2(x)   (((x)&PPCIDX2MASK)>>PPCIDX2SH)
+#define PPCGETSTRM(x)   (((x)&PPCSTRM)>>PPCDSH)
+
+
+#ifdef PPC_GEKKO
+ #define GEKKOLASMASK 0x0000007e
+ #define GEKKOWMASK 0x00000400
+ #define GEKKOIMASK 0x00000380
+ #define GEKKOW2MASK 0x00008000
+ #define GEKKOI2MASK 0x00007000
+ #define GEKKOVMASK 0x00000FFF
+
+ #define GEKKOLASSH 1
+ #define GEKKOWSH 10
+ #define GEKKOISH 7
+ #define GEKKOW2SH 15
+ #define GEKKOI2SH 12
+ #define GEKKOVSH 0
+
+ #define GEKKOGETLASID(x) (((x)&GEKKOLASMASK)>>GEKKOLASSH)
+ #define GEKKOGETW(x) (((x)&GEKKOWMASK)>>GEKKOWSH)
+ #define GEKKOGETI(x) (((x)&GEKKOIMASK)>>GEKKOISH)
+ #define GEKKOGETW2(x) (((x)&GEKKOW2MASK)>>GEKKOW2SH)
+ #define GEKKOGETI2(x) (((x)&GEKKOI2MASK)>>GEKKOI2SH)
+ #define GEKKOGETV(x) (((x)&GEKKOVMASK)>>GEKKOVSH)
+#endif
+
+/* Disassembler structure, the interface to the application */
+
+struct DisasmPara_PPC {
+  ppc_word *instr;              /* pointer to instruction to disassemble */
+  ppc_word *iaddr;              /* instr.addr., usually the same as instr */
+  char *opcode;                 /* buffer for opcode, min. 10 chars. */
+  char *operands;               /* operand buffer, min. 24 chars. */
+/* changed by disassembler: */
+  unsigned char type;           /* type of instruction, see below */
+  unsigned char flags;          /* additional flags */
+  unsigned short sreg;          /* register in load/store instructions */
+  ppc_word displacement;        /* branch- or load/store displacement */
+};
+
+#define PPCINSTR_OTHER      0   /* no additional info for other instr. */
+#define PPCINSTR_BRANCH     1   /* branch dest. = PC+displacement */
+#define PPCINSTR_LDST       2   /* load/store instruction: displ(sreg) */
+#define PPCINSTR_IMM        3   /* 16-bit immediate val. in displacement */
+
+#define PPCF_ILLEGAL   (1<<0)   /* illegal PowerPC instruction */
+#define PPCF_UNSIGNED  (1<<1)   /* unsigned immediate instruction */
+#define PPCF_SUPER     (1<<2)   /* supervisor level instruction */
+#define PPCF_64        (1<<3)   /* 64-bit only instruction */
+#define PPCF_ALTIVEC   (1<<4)   /* AltiVec instruction */
+
+
+/* ppc_disasm.o prototypes */
+#ifndef PPC_DISASM_C
+extern ppc_word *PPC_Disassemble(struct DisasmPara_PPC *);
+#endif
+
+

symbolizer/symbolizer.pro

@@ -19,10 +19,12 @@ SOURCES += main.cpp\
 	../WiiQt/aes.c \
 	elfparser.cpp \
 	dol.cpp \
-	be.cpp
+	be.cpp \
+    ppc_disasm.c
 
 HEADERS  += ../WiiQt/tools.h \
 	../WiiQt/aes.h \
 	elfparser.h \
 	dol.h \
-	be.h
+	be.h \
+    ppc_disasm.h