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 |*************************************************************************/
55 #include "os_support.h"
66 /*************************************************************************
68 |*************************************************************************/
70 static char* ExtractHex (uint32_t* value, char* getPtr)
76 while (*getPtr == ' ') getPtr++;
80 if ((c >= '0') && (c <= '9')) digit = (uint32_t)(c - '0');
81 else if ((c >= 'A') && (c <= 'F')) digit = (uint32_t)(c - 'A' + 10);
82 else if ((c >= 'a') && (c <= 'f')) digit = (uint32_t)(c - 'a' + 10);
92 static char* ExtractDecimal (uint32_t* value, char* getPtr)
98 while (*getPtr == ' ') getPtr++;
102 if ((c >= '0') && (c <= '9')) digit = (uint32_t)(c - '0');
110 } /* ExtractDecimal */
113 static void ExtractNumber (uint32_t* value, char* getPtr)
117 while (*getPtr == ' ') getPtr++;
118 if (*getPtr == '-') {
122 if ((*getPtr == '0') && ((*(getPtr+1) == 'x') || (*(getPtr+1) == 'X'))) {
124 (void)ExtractHex(value, getPtr);
127 (void)ExtractDecimal(value, getPtr);
129 if (neg) *value = -(*value);
130 } /* ExtractNumber */
133 static uint8_t* ExtractWord(uint16_t* value, uint8_t* buffer)
136 x = (uint16_t)*buffer++;
137 x = (x<<8) + (uint16_t)*buffer++;
143 static uint8_t* ExtractLong(uint32_t* value, uint8_t* buffer)
146 x = (uint32_t)*buffer++;
147 x = (x<<8) + (uint32_t)*buffer++;
148 x = (x<<8) + (uint32_t)*buffer++;
149 x = (x<<8) + (uint32_t)*buffer++;
155 static uint8_t* ExtractBlock(uint16_t count, uint8_t* data, uint8_t* buffer)
157 while (count--) *data++ = *buffer++;
162 static char* WriteHex(char* pa, uint8_t value, uint16_t* pCheckSum)
166 static char ByteToHex[] = "0123456789ABCDEF";
170 *pa++ = ByteToHex[temp];
172 *pa++ = ByteToHex[temp];
177 static char* BuildSRecord(char* pa, uint16_t sType, uint32_t addr,
178 const uint8_t* data, int nCount)
204 *pa++ = (char)(sType + '0');
205 sRLen = addrLen + nCount + 1;
207 pa = WriteHex(pa, (uint8_t)sRLen, &checkSum);
209 /* Write address field */
210 for (i = 1; i <= addrLen; i++) {
211 pa = WriteHex(pa, (uint8_t)(addr >> (8 * (addrLen - i))), &checkSum);
214 /* Write code/data fields */
215 for (i = 0; i < nCount; i++) {
216 pa = WriteHex(pa, *data++, &checkSum);
219 /* Write checksum field */
220 checkSum = ~checkSum;
221 pa = WriteHex(pa, (uint8_t)checkSum, &checkSum);
227 static void ConvertELF(char* fileName, uint32_t loadOffset)
232 uint8_t rxBlock[1024];
236 uint32_t loadDiff = 0;
237 Elf32_Ehdr elfHeader;
238 Elf32_Shdr sectHeader[32];
245 if ((file = fopen(fileName,"rb")) == NULL) {
246 fprintf (stderr, "Can't open %s: %s\n", fileName, strerror(errno));
250 /* read ELF header */
251 rxCount = fread(rxBlock, 1, sizeof elfHeader, file);
252 getPtr = ExtractBlock(sizeof elfHeader.e_ident, elfHeader.e_ident, rxBlock);
253 getPtr = ExtractWord(&elfHeader.e_type, getPtr);
254 getPtr = ExtractWord(&elfHeader.e_machine, getPtr);
255 getPtr = ExtractLong((uint32_t *)&elfHeader.e_version, getPtr);
256 getPtr = ExtractLong((uint32_t *)&elfHeader.e_entry, getPtr);
257 getPtr = ExtractLong((uint32_t *)&elfHeader.e_phoff, getPtr);
258 getPtr = ExtractLong((uint32_t *)&elfHeader.e_shoff, getPtr);
259 getPtr = ExtractLong((uint32_t *)&elfHeader.e_flags, getPtr);
260 getPtr = ExtractWord(&elfHeader.e_ehsize, getPtr);
261 getPtr = ExtractWord(&elfHeader.e_phentsize, getPtr);
262 getPtr = ExtractWord(&elfHeader.e_phnum, getPtr);
263 getPtr = ExtractWord(&elfHeader.e_shentsize, getPtr);
264 getPtr = ExtractWord(&elfHeader.e_shnum, getPtr);
265 getPtr = ExtractWord(&elfHeader.e_shstrndx, getPtr);
266 if ( (rxCount != sizeof elfHeader)
267 || (elfHeader.e_ident[0] != ELFMAG0)
268 || (elfHeader.e_ident[1] != ELFMAG1)
269 || (elfHeader.e_ident[2] != ELFMAG2)
270 || (elfHeader.e_ident[3] != ELFMAG3)
271 || (elfHeader.e_type != ET_EXEC)
274 fprintf (stderr, "*** illegal file format\n");
278 /* read all section headers */
279 fseek(file, elfHeader.e_shoff, SEEK_SET);
280 for (i = 0; i < elfHeader.e_shnum; i++) {
281 rxCount = fread(rxBlock, 1, sizeof sectHeader[0], file);
282 getPtr = ExtractLong((uint32_t *)§Header[i].sh_name, rxBlock);
283 getPtr = ExtractLong((uint32_t *)§Header[i].sh_type, getPtr);
284 getPtr = ExtractLong((uint32_t *)§Header[i].sh_flags, getPtr);
285 getPtr = ExtractLong((uint32_t *)§Header[i].sh_addr, getPtr);
286 getPtr = ExtractLong((uint32_t *)§Header[i].sh_offset, getPtr);
287 getPtr = ExtractLong((uint32_t *)§Header[i].sh_size, getPtr);
288 getPtr = ExtractLong((uint32_t *)§Header[i].sh_link, getPtr);
289 getPtr = ExtractLong((uint32_t *)§Header[i].sh_info, getPtr);
290 getPtr = ExtractLong((uint32_t *)§Header[i].sh_addralign, getPtr);
291 getPtr = ExtractLong((uint32_t *)§Header[i].sh_entsize, getPtr);
292 if (rxCount != sizeof sectHeader[0]) {
294 fprintf (stderr, "*** illegal file format\n");
299 if ((hdr_name = strrchr(fileName, '/')) == NULL) {
304 /* write start record */
305 (void)BuildSRecord(srecLine, 0, 0, (uint8_t *)hdr_name, strlen(hdr_name));
306 printf("%s\r\n",srecLine);
308 /* write data records */
311 for (i = 0; i < elfHeader.e_shnum; i++) {
312 if ( (sectHeader[i].sh_type == SHT_PROGBITS)
313 && (sectHeader[i].sh_size != 0)
315 loadSize = sectHeader[i].sh_size;
316 if (sectHeader[i].sh_flags != 0) {
317 loadAddr = sectHeader[i].sh_addr;
318 loadDiff = loadAddr - sectHeader[i].sh_offset;
321 loadAddr = sectHeader[i].sh_offset + loadDiff;
324 if (loadAddr < firstAddr)
325 firstAddr = loadAddr;
327 /* build s-records */
328 loadSize = sectHeader[i].sh_size;
329 fseek(file, sectHeader[i].sh_offset, SEEK_SET);
331 rxCount = fread(rxBlock, 1, (loadSize > 32) ? 32 : loadSize, file);
334 fprintf (stderr, "*** illegal file format\n");
337 (void)BuildSRecord(srecLine, 3, loadAddr + loadOffset, rxBlock, rxCount);
340 printf("%s\r\n",srecLine);
346 (void)BuildSRecord(srecLine, 7, firstAddr + loadOffset, 0, 0);
347 printf("%s\r\n",srecLine);
352 /*************************************************************************
354 |*************************************************************************/
356 int main( int argc, char *argv[ ])
361 ConvertELF(argv[1], 0);
363 else if ((argc == 4) && (strcmp(argv[1], "-o") == 0)) {
364 ExtractNumber(&offset, argv[2]);
365 ConvertELF(argv[3], offset);
368 fprintf (stderr, "Usage: img2srec [-o offset] <image>\n");