1 // Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 #include <stdio.h>

    17 #include <string.h>

    18 #include <stdlib.h>

    19 #include <tools/elfdefs.h>

    20 #include <sys/stat.h>

    21 

    22 #if defined(__MSVCDOTNET__) || defined(__TOOLS2__)

    23 #include <iostream>

    24 #include <iomanip>

    25 using namespace std;

    26 #else //(!__MSVCDOTNET__ && !__TOOLS2__) 

    27 #include <iostream.h>

    28 #include <iomanip.h>

    29 #endif //__MSVCDOTNET__

    30 

    31 #define ADDR(rtype, p, o) (rtype *)(((char *)p) + o)

    32 

    33 bool ignoreSomeSections;

    34 

    35 void hexdump(unsigned char* data, int aSize, int offset)

    36 	//  print hex dump of relevant sections

    37 	{

    38 	int i=0;

    39 	int p=0;

    40 	while (i<aSize)	

    41 		{

    42 		int count=0;

    43 		if(p==0){printf("\t%06x   ",offset);} // offset into section

    44 		while (i<aSize && count<4)

    45 			{ 

    46 			printf("%02X", *data);		// print 4 lots of %08x for the data expresed as 32-bit word 

    47 			data++;

    48 			i++;

    49 			count++;

    50 			offset++;

    51 			}

    52 

    53 		printf("  ");

    54 		p++;

    55 		if (p==4)

    56 			{

    57 			data=data-16;

    58 			for (int i=0;i<16;i++)			//print 16 bytes of memory interpreted 

    59 				{							//as ASCII characters with all non-printing 

    60 				if (*data>32 && *data <127)	//characters converted to dots

    61 					{

    62 					printf("%1c",*data);

    63 					}

    64 				else

    65 					{

    66 					printf(".");

    67 					}

    68 					data++;

    69 				}

    70 			p=0; 

    71 			printf(" \n "); 

    72 			}

    73 		}

    74 		printf(" \n\n "); 	   	

    75 	}

    76 

    77 void print_directive(unsigned char* data, int size)

    78 	// print formatted text of directive section

    79 	{

    80 	printf ("\t");

    81 

    82 	for (int i=0; i<size; i++)

    83 		{

    84 		if ((char)data[i]>31 && (char)data[i]<127)

    85 			{

    86 			printf ("%c", (char)data[i]);

    87 			}

    88 

    89 		if ((char)data[i]=='\n')

    90 			{

    91 			printf ("\n\t");

    92 			}

    93 		}

    94 

    95 	printf ("\n");

    96 	}

    97 

    98 void print_reloc(Elf32_Ehdr* eh, Elf32_Sym* symT, unsigned char* strtab)

    99 	// print relocation section

   100 	{

   101 	Elf32_Shdr* shdr = ADDR(Elf32_Shdr, eh, eh->e_shoff);

   102 	for (int j=0;j< eh->e_shnum;j++)

   103 		{

   104 		char* sname = ADDR(char, eh, shdr[eh->e_shstrndx].sh_offset);

   105 		if ( (shdr[j].sh_type==9) && 

   106 		     ( (!ignoreSomeSections) || 

   107 		       (strncmp(".rel.debug_", &sname[shdr[j].sh_name], 11))

   108 		     )

   109 		   )

   110 			{

   111 			unsigned char* data = ADDR(unsigned char, eh, shdr[j].sh_offset);

   112 			int noOfReloc=shdr[j].sh_size / shdr[j].sh_entsize;

   113 			printf("\n\n\n\t\t\t%s\n", &sname[shdr[j].sh_name]);

   114 			Elf32_Rel* rl=(Elf32_Rel*)data;				// pointer to relocation section	

   115 			for (int i=0;i<noOfReloc;i++)

   116 				{

   117 				unsigned char* symbolName = strtab;		// pointer to firest element of string											// table which holds symbol names

   118 				Elf32_Sym*  sym = symT;					// pointer to symbol table

   119 				int symTIndx= ELF32_R_SYM(rl->r_info);		// symbol Tableindex

   120 				sym=sym+symTIndx;							

   121 				symbolName=symbolName+sym->st_name;		// index into string table section 

   122 															// with symbol names

   123 				printf("\t0x%08x \t", rl->r_offset);		// prints offset into relocation section

   124 				printf("%d", symTIndx);					// symbol table index

   125 				printf("\t%s\n",symbolName);				// symbol name

   126 				rl++;			

   127 				}

   128 			}

   129 		}

   130 	}	

   131 

   132 void print_GlSymbols(Elf32_Ehdr* eh, Elf32_Sym* symT, unsigned char* strtab)

   133 	// print global symbols from Symbol Table

   134 	{	

   135 	Elf32_Shdr* shdr = ADDR(Elf32_Shdr, eh, eh->e_shoff);

   136 	char* sname = ADDR(char, eh, shdr[eh->e_shstrndx].sh_offset);

   137 	for (int i=0;i< eh->e_shnum;i++)

   138 		{

   139 		if (!strcmp(".symtab", &sname[shdr[i].sh_name]))

   140 			{

   141 		  	int noOfSym=shdr[i].sh_size / shdr[i].sh_entsize; 	// number of symbols

   142 		  	const char *symName =(const char *)strtab;

   143 		  	int count = 1;										

   144 		  	printf("Global symbols:\n");

   145 		  	printf("=================\n\n");

   146 		  	for (int l=0;l< noOfSym ;l++)

   147 				{

   148 				symT=symT+1;

   149 				if( ELF32_ST_BIND(symT->st_info) == 1)			// searching for global symbols

   150 			 		{

   151 			  		symName = symName + symT->st_name;			// index into string table section 

   152 			 		printf("%d	",count);

   153 			  		printf(symName);

   154 			  		printf("\n");

   155 			  		symName = symName - symT->st_name;			// back to pointing to first byte of string table

   156 			  		count++;

   157 					}

   158 			

   159 				}

   160 			}

   161 		}

   162 	}

   163 	

   164 void print_elf_header(Elf32_Ehdr* eh)

   165 	{

   166 	// print elf header

   167 	if (eh->e_version==1)

   168 		printf("\tHeader version: EV_CURRENT (Current version)\n");

   169 	else

   170 		printf("\tInvalid version: EV_NONE (Invalid version)\n");

   171 

   172 	if (eh->e_type==0)

   173 		printf("\tFile Type: ET_NONE (No file type) (0)\n");

   174 	else if (eh->e_type==1)

   175 			printf("\tFile Type: ET_REL (Relocatable object) (1)\n");

   176 	else if (eh->e_type==2)

   177 			printf("\tFile Type: ET_EXEC (Executable file) (2)\n"); 

   178 	else if (eh->e_type==3)

   179 			printf("\tFile Type: ET_DYN (Shared object file) (3)\n"); 

   180 	else if (eh->e_type==4)

   181 			printf("\tFile Type: ET_CORE (Core File) (4)\n"); 

   182 	else if (eh->e_type==65280)

   183 			printf("\tFile Type: ET_LOPROC (Precessor Specific) (ff00)\n");

   184 	else	

   185 			printf("\tFile Type: ET_HIPROC (Precessor Specific) (ffff)\n");

   186 	if (eh->e_machine==40)

   187 		printf("\tMachine: EM_ARM (ARM)\n");

   188 	else

   189 		printf("\tERROR:\tUnexpected machine\n");

   190 

   191 	printf("\tEntry offset (in SHF_ENTRYSECT section):0x%08x \n",eh->e_entry);

   192 	printf("\tProgram header entries : %d\n",eh->e_phnum); 

   193 	printf("\tSection header entries : %d\n",eh->e_shnum); 

   194   

   195 	printf("\tProgram header offset  : %d",eh->e_phoff); 

   196 	printf("  bytes (0x%08X",eh->e_phoff);

   197 	printf(")\n");

   198 	printf("\tSection header offset  : %d",eh->e_shoff); 

   199 	printf("  bytes (0x%08X",eh->e_shoff);

   200 	printf(")\n");

   201 

   202 	printf("\tProgram header entry size  : %d",eh->e_phentsize); 

   203 	printf("  bytes (0x%02X",eh->e_phentsize);

   204 	printf(")\n");

   205 	printf("\tSection header entry size  : %d",eh->e_shentsize); 

   206 	printf("  bytes (0x%02X",eh->e_shentsize);

   207 	printf(")\n");

   208 	printf("\tSection header string table index: %d \n", eh->e_shstrndx);

   209 	printf("\tHeader size: %d", eh->e_ehsize);

   210 	printf("  bytes (0x%02X",eh->e_ehsize);

   211 	printf(")\n");

   212 	}

   213 

   214 void print_sect_header(char* sname, Elf32_Shdr* shdr, int count)

   215 	// print section header names

   216 	{

   217 	static const char* KtypeName[]={"0","SHT_PROGBITS (1)","SHT_SYMTAB (2)","SHT_STRTAB (3)",

   218 								  "SHT_RELA (4)","5",	"SHT_DINAMIC (6)","7","8","SHT_REL (9)",

   219 								  "10","SHT_DINSYM (11)"};

   220 						

   221 	printf("\n\n\tName\t\t:%1s\n ",&sname[shdr[count].sh_name]);

   222 	printf("\tType\t\t: %s\n",  KtypeName[shdr[count].sh_type]);

   223 	printf("\tAddr\t\t: 0x%08X\n",shdr[count].sh_addr);

   224 	printf("\tSize\t\t: %1d", shdr[count].sh_size);

   225 	printf("  bytes (0x%X",shdr[count].sh_size);

   226 	printf(")\n");

   227 	printf("\tEntry Size\t: %1d\n",shdr[count].sh_entsize);

   228 	printf("\tAligment\t: %1d\n\n\n",shdr[count].sh_addralign);		 	

   229 	}

   230 

   231 unsigned char* findSymbolStringT(Elf32_Ehdr* eh)

   232 	//calculate and return pointer to the first byte of string table(the one with symbol names)

   233 	{

   234 	Elf32_Shdr* shdr = ADDR(Elf32_Shdr, eh, eh->e_shoff);

   235 	char* sname = ADDR(char, eh, shdr[eh->e_shstrndx].sh_offset);

   236 	for (int i=0;i < eh->e_shnum; i++)

   237 		{

   238 		if (!strcmp(".strtab", &sname[shdr[i].sh_name]))

   239 			{

   240 			unsigned char* data = ADDR(unsigned char, eh, shdr[i].sh_offset); 

   241 			return data;	//pointer to the first byte of string table section

   242 			}

   243 		}

   244 	return NULL;	//if not found  

   245 	}

   246 

   247 Elf32_Sym* findSymbolT(Elf32_Ehdr* eh)

   248 	//calculate and return pointer to the first element of symbol table	

   249 	{

   250 	Elf32_Shdr* shdr = ADDR(Elf32_Shdr, eh, eh->e_shoff);

   251 	for (int i=0;i < eh->e_shnum;i++)

   252 		{

   253 		if (shdr[i].sh_type==2)

   254 			{

   255 			unsigned char* data = ADDR(unsigned char, eh, shdr[i].sh_offset);

   256 			Elf32_Sym* sym=(Elf32_Sym*)data;

   257 			return sym;		//pointer to the first element of symbol table.

   258 			}

   259 		}

   260 	return NULL; // if not found

   261 	}

   262 

   263 void print_Summary(Elf32_Ehdr* eh)

   264 	{

   265 	//print section names

   266 	Elf32_Shdr* shdr = ADDR(Elf32_Shdr, eh, eh->e_shoff);

   267 	char* sname = ADDR(char, eh, shdr[eh->e_shstrndx].sh_offset);

   268 	printf("\nSummary: \n");

   269 	printf("==========\n");

   270 	for (int i=0;i< eh->e_shnum;i++)

   271 		{

   272 		printf(&sname[shdr[i].sh_name]);

   273 		printf("\n");

   274 		}

   275 	}

   276 

   277 bool printAll;

   278 

   279 int do_elf_file(char* buffer, char* name)

   280 	{

   281 	Elf32_Ehdr* eh=(Elf32_Ehdr *)buffer;	//elf header

   282 	if (eh->e_ident[EI_MAG0] !=0x7f || eh->e_ident[EI_MAG1] != 0x45 || eh->e_ident[EI_MAG2] !=0x4c || eh->e_ident[EI_MAG3] != 0x46)

   283 		{

   284 		// EI_MAG0 to EI_MAG3 - A files' first 4 bytes hold a 'magic number', identifying the file as an ELF object file. 

   285 		cout << "Error: " << name << " is not a valid ELF file";

   286 		return 1;

   287 		}

   288 	if (eh->e_ident[EI_DATA] == 2)							

   289 		{

   290 		// ELF Header size should be 52 bytes or converted into Big-Endian system 13312

   291 		if (eh->e_ehsize != 13312)

   292 			{

   293 			printf("\tERROR:\tELF Header contains invalid file type\n");

   294 			exit(1);

   295 			}

   296 		// e_ident[EI_DATA] specifies the data encoding of the processor-specific data in the object file.

   297 		printf("\tERROR:\tData encoding ELFDATA2MSB (Big-Endian) not supported\n");

   298 		exit(1);

   299 		}

   300 	if (eh->e_ehsize != 52)

   301 		{

   302 		// ELF Header size should be 52 bytes

   303         printf("\tERROR:\tELF Header contains invalid file type\n");

   304         exit(1);

   305         }

   306 	int shoff = eh->e_shoff;							    // offset of section header table

   307 	Elf32_Shdr* shdr = ADDR(Elf32_Shdr, eh, shoff);			// calculating pointer to Secton Header Table

   308 															// Elf32_Shdr * shdr = (Elf32_Shdr *)(buffer+shoff); 

   309 	int shnum = eh->e_shnum;							    // number of section headers

   310 	int shstrndx = eh->e_shstrndx;

   311 	int snameoffset = shdr[shstrndx].sh_offset;				// offset in file of sections' names

   312 	char* sname = ADDR(char, eh, snameoffset);				// pointer to String Table which holds section names

   313 															// char * sname = (char *)(buffer+snameoffset);

   314 	print_elf_header(eh);									// print Elf Header

   315 	

   316 	Elf32_Sym* symT= findSymbolT(eh);	// pointer to Symbol table

   317 	if (symT==NULL)

   318 		{

   319 		printf("\nSymbol table not found\n");

   320 		}

   321 	unsigned char* strtab=findSymbolStringT(eh);	// pointer to String table which holds symbol names

   322 	if (strtab==NULL)

   323 		{	

   324 		printf("\nString (the one which holds symbol names) table not found\n");

   325 		}

   326 		print_reloc(eh,symT, strtab);	// print relocation info showing symbol names and

   327 					        // and the name of section in which the relocaton occurs.														

   328 	for(int i = 0; i < shnum; i++)

   329 		{    

   330 		unsigned char* data = ADDR(unsigned char, eh, shdr[i].sh_offset);	//pointer to the first byte in the section

   331 															//unsigned char * data = (unsigned char * )(buffer+shdr[i].sh_offset);

   332 		int size = shdr[i].sh_size;	// section size in bytes

   333 	

   334 		//print directive section

   335 		if (!strcmp(".directive", &sname[shdr[i].sh_name])) 

   336 			{ 

   337 			print_sect_header(sname, shdr, i);

   338 			print_directive(data,size);

   339 			}

   340 

   341 		if (!strcmp(".symtab", &sname[shdr[i].sh_name])) 

   342 			{

   343 			 print_sect_header(sname, shdr, i);	

   344 			 // print global symbols

   345 			 print_GlSymbols(eh,symT, strtab);								

   346 			}

   347 

   348 		//print relevant section header names

   349  		//print hex dump of relevant sections

   350 		if (shdr[i].sh_type==1 || shdr[i].sh_type==4 || shdr[i].sh_type==6 ||

   351 		    shdr[i].sh_type==9 || shdr[i].sh_type==11)

   352 			{

   353 			if (strcmp(".comment", &sname[shdr[i].sh_name])&&

   354 				strcmp(".line", &sname[shdr[i].sh_name])   &&

   355 				strcmp(".hash", &sname[shdr[i].sh_name])   &&

   356 				strcmp(".note", &sname[shdr[i].sh_name])   &&

   357 				strcmp(".directive", &sname[shdr[i].sh_name]) &&

   358 				strncmp(".debug",&sname[shdr[i].sh_name] ,6))

   359 				{

   360 				if ( ! ( (ignoreSomeSections) &&

   361 					 (strncmp(".rel.debug_", &sname[shdr[i].sh_name], 11)==0)

   362 				       )

   363 				   )

   364 					{

   365 					print_sect_header(sname, shdr, i);			

   366 			 	    hexdump(data,size,i);

   367 					}

   368 				}

   369 			}

   370 		if (printAll)		// displays extra information

   371 			{ 	

   372 			if(i!=0)

   373 			 	{

   374 		 	 	print_sect_header(sname, shdr, i);					

   375 		 		hexdump(data,size,i);				

   376 		 		}

   377 		 	}		

   378 		}

   379 	print_Summary(eh);	// print section names

   380 	return 0;

   381 }

   382 

   383 int read_ar_element_header(char* ptr)

   384 	{

   385 	int length = strtol(ptr+48,0,10);

   386 

   387 	if (strncmp(ptr+58, "\x60\x0A", 2) != 0)

   388 		{

   389 		return -1;

   390 		}

   391 	return length;

   392 	}

   393 	

   394 int main(int argc, char* argv[])

   395 	{

   396 	char* arg;

   397 	int numberOfOptions=2;

   398 	printAll=0;

   399 	ignoreSomeSections=0;

   400 	if (argc<2)

   401 		{

   402 		cout << "File not specified";

   403 		exit(1);

   404 		}

   405 	else if (argc>numberOfOptions+2)

   406 		{

   407 		cout << "Too many arguments";

   408 		exit(1);

   409 		}

   410 	else

   411 		{

   412 		for (int i=1;i<=argc-2;i++)

   413 			{

   414 			if ( strcmp("-i", argv[i]) ==0 )

   415 				{

   416 				ignoreSomeSections=1;

   417 				}

   418 			else if ( strcmp("-a", argv[i]) ==0 )

   419 				{

   420 				printAll=1;

   421 				}

   422 			}

   423 		arg=argv[argc-1];

   424 		}

   425 

   426 	struct stat results;

   427 	stat(arg, &results); 

   428 	FILE *elffile;

   429 	if((elffile  = fopen(arg, "rb" )) == NULL)

   430    		{

   431    		cout << "Error opening file " << arg;

   432 		exit (1); 

   433    		}

   434 	char* buffer=new  char [results.st_size];//allocating enough memory 

   435 	fread( buffer, sizeof( char ), results.st_size, elffile);

   436 	fclose(elffile);						

   437 	

   438 	if (strncmp(buffer, "!<arch>\x0A", 8) != 0)

   439 		{

   440 		// plain ELF file

   441 		if (do_elf_file(buffer, arg) != 0)

   442 			{

   443 			return 1;

   444 			}

   445 		return 0;

   446 		}

   447 

   448 	// library file

   449 	char* nextfile = buffer;

   450 	int remainder = results.st_size;

   451 

   452 #define ADVANCE(n)	nextfile+=(n); remainder-=(n);

   453 

   454 	ADVANCE(8);

   455 		

   456 	while (remainder > 0)

   457 		{

   458 		int element_length = read_ar_element_header(nextfile);

   459 		ADVANCE(60);

   460 		

   461 		if (element_length < 0 || element_length > remainder)

   462 			{

   463 			cout << "Error: archive file corrupt";

   464 			return 1;

   465 			}

   466 		

   467 		if (strncmp(nextfile, "\x7F\x45\x4C\x46",4) == 0)

   468 			{

   469 			if (do_elf_file(nextfile, "archive_element") != 0)

   470 				{

   471 				return 1;

   472 				}

   473 			}

   474 		element_length += element_length&1;	// round up to a multiple of 2

   475 		ADVANCE(element_length);

   476 		}

   477 		

   478 	return 0;

   479 	}