xref: /openbmc/u-boot/tools/img2srec.c (revision 33b1d3f4) 
1 /*************************************************************************
2 |  COPYRIGHT (c) 2000 BY ABATRON AG
3 |*************************************************************************
4 |
5 |  PROJECT NAME: Linux Image to S-record Conversion Utility
6 |  FILENAME    : img2srec.c
7 |
8 |  COMPILER    : GCC
9 |
10 |  TARGET OS   : LINUX / UNIX
11 |  TARGET HW   : -
12 |
13 |  PROGRAMMER  : Abatron / RD
14 |  CREATION    : 07.07.00
15 |
16 |*************************************************************************
17 |
18 |  DESCRIPTION :
19 |
20 |  Utility to convert a Linux Boot Image to S-record:
21 |  ==================================================
22 |
23 |  This command line utility can be used to convert a Linux boot image
24 |  (zimage.initrd) to S-Record format used for flash programming.
25 |  This conversion takes care of the special sections "IMAGE" and INITRD".
26 |
27 |  img2srec [-o offset] image > image.srec
28 |
29 |
30 |  Build the utility:
31 |  ==================
32 |
33 |  To build the utility use GCC as follows:
34 |
35 |  gcc img2srec.c -o img2srec
36 |
37 |
38 |*************************************************************************
39 |
40 |
41 |  UPDATES     :
42 |
43 |  DATE      NAME  CHANGES
44 |  -----------------------------------------------------------
45 |  Latest update
46 |
47 |  07.07.00  aba   Initial release
48 |
49 |*************************************************************************/
50 
51 /*************************************************************************
52 |  INCLUDES
53 |*************************************************************************/
54 
55 #include <stddef.h>
56 #include <stdio.h>
57 #include <stdlib.h>
58 #include <ctype.h>
59 #include <string.h>
60 #include <elf.h>
61 #include <unistd.h>
62 #include <errno.h>
63 
64 extern int errno;
65 
66 /*************************************************************************
67 |  DEFINES
68 |*************************************************************************/
69 
70 #define FALSE           0
71 #define TRUE            1
72 
73 /*************************************************************************
74 |  MACROS
75 |*************************************************************************/
76 
77 /*************************************************************************
78 |  TYPEDEFS
79 |*************************************************************************/
80 
81 typedef uint8_t   CHAR;
82 typedef uint8_t   BYTE;
83 typedef uint16_t  WORD;
84 typedef uint32_t  DWORD;
85 typedef int       BOOL;
86 
87 /*************************************************************************
88 |  LOCALS
89 |*************************************************************************/
90 
91 /*************************************************************************
92 |  PROTOTYPES
93 |*************************************************************************/
94 
95 static char *ExtractHex(DWORD *value, char *getPtr);
96 static char *ExtractDecimal(DWORD *value, char *getPtr);
97 static void ExtractNumber(DWORD *value, char *getPtr);
98 static BYTE *ExtractWord(WORD *value, BYTE *buffer);
99 static BYTE *ExtractLong(DWORD *value, BYTE *buffer);
100 static BYTE *ExtractBlock(WORD count, BYTE *data, BYTE *buffer);
101 static char *WriteHex(char *pa, BYTE value, WORD *pCheckSum);
102 static char *BuildSRecord(char *pa, WORD sType, DWORD addr,
103 			  const BYTE *data, int nCount);
104 static void ConvertELF(char *fileName, DWORD loadOffset);
105 int main(int argc, char *argv[]);
106 
107 /*************************************************************************
108 |  FUNCTIONS
109 |*************************************************************************/
110 
111 static char* ExtractHex (DWORD* value,  char* getPtr)
112 {
113   DWORD num;
114   DWORD digit;
115   BYTE  c;
116 
117   while (*getPtr == ' ') getPtr++;
118   num = 0;
119   for (;;) {
120     c = *getPtr;
121     if      ((c >= '0') && (c <= '9')) digit = (DWORD)(c - '0');
122     else if ((c >= 'A') && (c <= 'F')) digit = (DWORD)(c - 'A' + 10);
123     else if ((c >= 'a') && (c <= 'f')) digit = (DWORD)(c - 'a' + 10);
124     else break;
125     num <<= 4;
126     num += digit;
127     getPtr++;
128   } /* for */
129   *value = num;
130   return getPtr;
131 } /* ExtractHex */
132 
133 static char* ExtractDecimal (DWORD* value,  char* getPtr)
134 {
135   DWORD num;
136   DWORD digit;
137   BYTE  c;
138 
139   while (*getPtr == ' ') getPtr++;
140   num = 0;
141   for (;;) {
142     c = *getPtr;
143     if      ((c >= '0') && (c <= '9')) digit = (DWORD)(c - '0');
144     else break;
145     num *= 10;
146     num += digit;
147     getPtr++;
148   } /* for */
149   *value = num;
150   return getPtr;
151 } /* ExtractDecimal */
152 
153 
154 static void ExtractNumber (DWORD* value,  char* getPtr)
155 {
156   BOOL  neg = FALSE;;
157 
158   while (*getPtr == ' ') getPtr++;
159   if (*getPtr == '-') {
160     neg = TRUE;
161     getPtr++;
162   } /* if */
163   if ((*getPtr == '0') && ((*(getPtr+1) == 'x') || (*(getPtr+1) == 'X'))) {
164     getPtr +=2;
165     (void)ExtractHex(value, getPtr);
166   } /* if */
167   else {
168     (void)ExtractDecimal(value, getPtr);
169   } /* else */
170   if (neg) *value = -(*value);
171 } /* ExtractNumber */
172 
173 
174 static BYTE* ExtractWord(WORD* value, BYTE* buffer)
175 {
176   WORD x;
177   x = (WORD)*buffer++;
178   x = (x<<8) + (WORD)*buffer++;
179   *value = x;
180   return buffer;
181 } /* ExtractWord */
182 
183 
184 static BYTE* ExtractLong(DWORD* value, BYTE* buffer)
185 {
186   DWORD x;
187   x = (DWORD)*buffer++;
188   x = (x<<8) + (DWORD)*buffer++;
189   x = (x<<8) + (DWORD)*buffer++;
190   x = (x<<8) + (DWORD)*buffer++;
191   *value = x;
192   return buffer;
193 } /* ExtractLong */
194 
195 
196 static BYTE* ExtractBlock(WORD count, BYTE* data, BYTE* buffer)
197 {
198   while (count--) *data++ = *buffer++;
199   return buffer;
200 } /* ExtractBlock */
201 
202 
203 static char* WriteHex(char* pa, BYTE value, WORD* pCheckSum)
204 {
205   WORD  temp;
206 
207   static  char ByteToHex[] = "0123456789ABCDEF";
208 
209   *pCheckSum += value;
210   temp  = value / 16;
211   *pa++ = ByteToHex[temp];
212   temp  = value % 16;
213   *pa++ = ByteToHex[temp];
214   return pa;
215 }
216 
217 
218 static char* BuildSRecord(char* pa, WORD sType, DWORD addr,
219 			  const BYTE* data, int nCount)
220 {
221   WORD  addrLen;
222   WORD  sRLen;
223   WORD  checkSum;
224   WORD  i;
225 
226   switch (sType) {
227   case 0:
228   case 1:
229   case 9:
230     addrLen = 2;
231     break;
232   case 2:
233   case 8:
234     addrLen = 3;
235     break;
236   case 3:
237   case 7:
238     addrLen = 4;
239     break;
240   default:
241     return pa;
242   } /* switch */
243 
244   *pa++ = 'S';
245   *pa++ = (char)(sType + '0');
246   sRLen = addrLen + nCount + 1;
247   checkSum = 0;
248   pa = WriteHex(pa, (BYTE)sRLen, &checkSum);
249 
250   /* Write address field */
251   for (i = 1; i <= addrLen; i++) {
252     pa = WriteHex(pa, (BYTE)(addr >> (8 * (addrLen - i))), &checkSum);
253   } /* for */
254 
255   /* Write code/data fields */
256   for (i = 0; i < nCount; i++) {
257     pa = WriteHex(pa, *data++, &checkSum);
258   } /* for */
259 
260   /* Write checksum field */
261   checkSum = ~checkSum;
262   pa = WriteHex(pa, (BYTE)checkSum, &checkSum);
263   *pa++ = '\0';
264   return pa;
265 }
266 
267 
268 static void ConvertELF(char* fileName, DWORD loadOffset)
269 {
270   FILE*         file;
271   int           i;
272   int           rxCount;
273   BYTE          rxBlock[1024];
274   DWORD         loadSize;
275   DWORD         firstAddr;
276   DWORD         loadAddr;
277   DWORD         loadDiff = 0;
278   Elf32_Ehdr    elfHeader;
279   Elf32_Shdr    sectHeader[32];
280   BYTE*         getPtr;
281   char          srecLine[128];
282   char		*hdr_name;
283 
284 
285   /* open file */
286   if ((file = fopen(fileName,"rb")) == NULL) {
287     fprintf (stderr, "Can't open %s: %s\n", fileName, strerror(errno));
288     return;
289   } /* if */
290 
291   /* read ELF header */
292   rxCount = fread(rxBlock, 1, sizeof elfHeader, file);
293   getPtr = ExtractBlock(sizeof elfHeader.e_ident, elfHeader.e_ident, rxBlock);
294   getPtr = ExtractWord(&elfHeader.e_type, getPtr);
295   getPtr = ExtractWord(&elfHeader.e_machine, getPtr);
296   getPtr = ExtractLong((DWORD *)&elfHeader.e_version, getPtr);
297   getPtr = ExtractLong((DWORD *)&elfHeader.e_entry, getPtr);
298   getPtr = ExtractLong((DWORD *)&elfHeader.e_phoff, getPtr);
299   getPtr = ExtractLong((DWORD *)&elfHeader.e_shoff, getPtr);
300   getPtr = ExtractLong((DWORD *)&elfHeader.e_flags, getPtr);
301   getPtr = ExtractWord(&elfHeader.e_ehsize, getPtr);
302   getPtr = ExtractWord(&elfHeader.e_phentsize, getPtr);
303   getPtr = ExtractWord(&elfHeader.e_phnum, getPtr);
304   getPtr = ExtractWord(&elfHeader.e_shentsize, getPtr);
305   getPtr = ExtractWord(&elfHeader.e_shnum, getPtr);
306   getPtr = ExtractWord(&elfHeader.e_shstrndx, getPtr);
307   if (    (rxCount              != sizeof elfHeader)
308        || (elfHeader.e_ident[0] != ELFMAG0)
309        || (elfHeader.e_ident[1] != ELFMAG1)
310        || (elfHeader.e_ident[2] != ELFMAG2)
311        || (elfHeader.e_ident[3] != ELFMAG3)
312        || (elfHeader.e_type     != ET_EXEC)
313      ) {
314     fclose(file);
315     fprintf (stderr, "*** illegal file format\n");
316     return;
317   } /* if */
318 
319   /* read all section headers */
320   fseek(file, elfHeader.e_shoff, SEEK_SET);
321   for (i = 0; i < elfHeader.e_shnum; i++) {
322     rxCount = fread(rxBlock, 1, sizeof sectHeader[0], file);
323     getPtr = ExtractLong((DWORD *)&sectHeader[i].sh_name, rxBlock);
324     getPtr = ExtractLong((DWORD *)&sectHeader[i].sh_type, getPtr);
325     getPtr = ExtractLong((DWORD *)&sectHeader[i].sh_flags, getPtr);
326     getPtr = ExtractLong((DWORD *)&sectHeader[i].sh_addr, getPtr);
327     getPtr = ExtractLong((DWORD *)&sectHeader[i].sh_offset, getPtr);
328     getPtr = ExtractLong((DWORD *)&sectHeader[i].sh_size, getPtr);
329     getPtr = ExtractLong((DWORD *)&sectHeader[i].sh_link, getPtr);
330     getPtr = ExtractLong((DWORD *)&sectHeader[i].sh_info, getPtr);
331     getPtr = ExtractLong((DWORD *)&sectHeader[i].sh_addralign, getPtr);
332     getPtr = ExtractLong((DWORD *)&sectHeader[i].sh_entsize, getPtr);
333     if (rxCount != sizeof sectHeader[0]) {
334       fclose(file);
335       fprintf (stderr, "*** illegal file format\n");
336       return;
337     } /* if */
338   } /* for */
339 
340   if ((hdr_name = strrchr(fileName, '/')) == NULL) {
341     hdr_name = fileName;
342   } else {
343     ++hdr_name;
344   }
345   /* write start record */
346   (void)BuildSRecord(srecLine, 0, 0, (BYTE *)hdr_name, strlen(hdr_name));
347   printf("%s\r\n",srecLine);
348 
349   /* write data records */
350   firstAddr = ~0;
351   loadAddr  =  0;
352   for (i = 0; i < elfHeader.e_shnum; i++) {
353     if (    (sectHeader[i].sh_type == SHT_PROGBITS)
354 	 && (sectHeader[i].sh_size != 0)
355 	 ) {
356       loadSize = sectHeader[i].sh_size;
357       if (sectHeader[i].sh_flags != 0) {
358 	loadAddr = sectHeader[i].sh_addr;
359 	loadDiff = loadAddr - sectHeader[i].sh_offset;
360       } /* if */
361       else {
362 	loadAddr = sectHeader[i].sh_offset + loadDiff;
363       } /* else */
364 
365       if (loadAddr < firstAddr)
366 	firstAddr = loadAddr;
367 
368       /* build s-records */
369       loadSize = sectHeader[i].sh_size;
370       fseek(file, sectHeader[i].sh_offset, SEEK_SET);
371       while (loadSize) {
372 	rxCount = fread(rxBlock, 1, (loadSize > 32) ? 32 : loadSize, file);
373 	if (rxCount < 0) {
374 	  fclose(file);
375 	  fprintf (stderr, "*** illegal file format\n");
376 	return;
377 	} /* if */
378 	(void)BuildSRecord(srecLine, 3, loadAddr + loadOffset, rxBlock, rxCount);
379 	loadSize -= rxCount;
380 	loadAddr += rxCount;
381 	printf("%s\r\n",srecLine);
382       } /* while */
383     } /* if */
384   } /* for */
385 
386   /* add end record */
387   (void)BuildSRecord(srecLine, 7, firstAddr + loadOffset, 0, 0);
388   printf("%s\r\n",srecLine);
389   fclose(file);
390 } /* ConvertELF */
391 
392 
393 /*************************************************************************
394 |  MAIN
395 |*************************************************************************/
396 
397 int main( int argc, char *argv[ ])
398 {
399   DWORD offset;
400 
401   if (argc == 2) {
402     ConvertELF(argv[1], 0);
403   } /* if */
404   else if ((argc == 4) && (strcmp(argv[1], "-o") == 0)) {
405     ExtractNumber(&offset, argv[2]);
406     ConvertELF(argv[3], offset);
407   } /* if */
408   else {
409     fprintf (stderr, "Usage: img2srec [-o offset] <image>\n");
410   } /* if */
411 
412   return 0;
413 } /* main */
414