1 /*************************************************************************
2 | COPYRIGHT (c) 2000 BY ABATRON AG
3 |*************************************************************************
5 | PROJECT NAME: Linux Image to S-record Conversion Utility
6 | FILENAME : img2srec.c
10 | TARGET OS : LINUX / UNIX
13 | PROGRAMMER : Abatron / RD
16 |*************************************************************************
20 | Utility to convert a Linux Boot Image to S-record:
21 | ==================================================
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".
27 | img2srec [-o offset] image > image.srec
33 | To build the utility use GCC as follows:
35 | gcc img2srec.c -o img2srec
38 |*************************************************************************
44 | -----------------------------------------------------------
47 | 07.07.00 aba Initial release
49 |*************************************************************************/
51 /*************************************************************************
53 |*************************************************************************/
66 /*************************************************************************
68 |*************************************************************************/
73 /*************************************************************************
75 |*************************************************************************/
77 /*************************************************************************
79 |*************************************************************************/
83 typedef uint16_t WORD;
84 typedef uint32_t DWORD;
87 /*************************************************************************
89 |*************************************************************************/
91 /*************************************************************************
93 |*************************************************************************/
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[]);
107 /*************************************************************************
109 |*************************************************************************/
111 static char* ExtractHex (DWORD* value, char* getPtr)
117 while (*getPtr == ' ') 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);
133 static char* ExtractDecimal (DWORD* value, char* getPtr)
139 while (*getPtr == ' ') getPtr++;
143 if ((c >= '0') && (c <= '9')) digit = (DWORD)(c - '0');
151 } /* ExtractDecimal */
154 static void ExtractNumber (DWORD* value, char* getPtr)
158 while (*getPtr == ' ') getPtr++;
159 if (*getPtr == '-') {
163 if ((*getPtr == '0') && ((*(getPtr+1) == 'x') || (*(getPtr+1) == 'X'))) {
165 (void)ExtractHex(value, getPtr);
168 (void)ExtractDecimal(value, getPtr);
170 if (neg) *value = -(*value);
171 } /* ExtractNumber */
174 static BYTE* ExtractWord(WORD* value, BYTE* buffer)
178 x = (x<<8) + (WORD)*buffer++;
184 static BYTE* ExtractLong(DWORD* value, BYTE* buffer)
187 x = (DWORD)*buffer++;
188 x = (x<<8) + (DWORD)*buffer++;
189 x = (x<<8) + (DWORD)*buffer++;
190 x = (x<<8) + (DWORD)*buffer++;
196 static BYTE* ExtractBlock(WORD count, BYTE* data, BYTE* buffer)
198 while (count--) *data++ = *buffer++;
203 static char* WriteHex(char* pa, BYTE value, WORD* pCheckSum)
207 static char ByteToHex[] = "0123456789ABCDEF";
211 *pa++ = ByteToHex[temp];
213 *pa++ = ByteToHex[temp];
218 static char* BuildSRecord(char* pa, WORD sType, DWORD addr,
219 const BYTE* data, int nCount)
245 *pa++ = (char)(sType + '0');
246 sRLen = addrLen + nCount + 1;
248 pa = WriteHex(pa, (BYTE)sRLen, &checkSum);
250 /* Write address field */
251 for (i = 1; i <= addrLen; i++) {
252 pa = WriteHex(pa, (BYTE)(addr >> (8 * (addrLen - i))), &checkSum);
255 /* Write code/data fields */
256 for (i = 0; i < nCount; i++) {
257 pa = WriteHex(pa, *data++, &checkSum);
260 /* Write checksum field */
261 checkSum = ~checkSum;
262 pa = WriteHex(pa, (BYTE)checkSum, &checkSum);
268 static void ConvertELF(char* fileName, DWORD loadOffset)
278 Elf32_Ehdr elfHeader;
279 Elf32_Shdr sectHeader[32];
286 if ((file = fopen(fileName,"rb")) == NULL) {
287 fprintf (stderr, "Can't open %s: %s\n", fileName, strerror(errno));
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)
315 fprintf (stderr, "*** illegal file format\n");
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 *)§Header[i].sh_name, rxBlock);
324 getPtr = ExtractLong((DWORD *)§Header[i].sh_type, getPtr);
325 getPtr = ExtractLong((DWORD *)§Header[i].sh_flags, getPtr);
326 getPtr = ExtractLong((DWORD *)§Header[i].sh_addr, getPtr);
327 getPtr = ExtractLong((DWORD *)§Header[i].sh_offset, getPtr);
328 getPtr = ExtractLong((DWORD *)§Header[i].sh_size, getPtr);
329 getPtr = ExtractLong((DWORD *)§Header[i].sh_link, getPtr);
330 getPtr = ExtractLong((DWORD *)§Header[i].sh_info, getPtr);
331 getPtr = ExtractLong((DWORD *)§Header[i].sh_addralign, getPtr);
332 getPtr = ExtractLong((DWORD *)§Header[i].sh_entsize, getPtr);
333 if (rxCount != sizeof sectHeader[0]) {
335 fprintf (stderr, "*** illegal file format\n");
340 if ((hdr_name = strrchr(fileName, '/')) == NULL) {
345 /* write start record */
346 (void)BuildSRecord(srecLine, 0, 0, (BYTE *)hdr_name, strlen(hdr_name));
347 printf("%s\r\n",srecLine);
349 /* write data records */
352 for (i = 0; i < elfHeader.e_shnum; i++) {
353 if ( (sectHeader[i].sh_type == SHT_PROGBITS)
354 && (sectHeader[i].sh_size != 0)
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;
362 loadAddr = sectHeader[i].sh_offset + loadDiff;
365 if (loadAddr < firstAddr)
366 firstAddr = loadAddr;
368 /* build s-records */
369 loadSize = sectHeader[i].sh_size;
370 fseek(file, sectHeader[i].sh_offset, SEEK_SET);
372 rxCount = fread(rxBlock, 1, (loadSize > 32) ? 32 : loadSize, file);
375 fprintf (stderr, "*** illegal file format\n");
378 (void)BuildSRecord(srecLine, 3, loadAddr + loadOffset, rxBlock, rxCount);
381 printf("%s\r\n",srecLine);
387 (void)BuildSRecord(srecLine, 7, firstAddr + loadOffset, 0, 0);
388 printf("%s\r\n",srecLine);
393 /*************************************************************************
395 |*************************************************************************/
397 int main( int argc, char *argv[ ])
402 ConvertELF(argv[1], 0);
404 else if ((argc == 4) && (strcmp(argv[1], "-o") == 0)) {
405 ExtractNumber(&offset, argv[2]);
406 ConvertELF(argv[3], offset);
409 fprintf (stderr, "Usage: img2srec [-o offset] <image>\n");