1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
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
64extern int errno;
65
66
67
68
69
70#define FALSE 0
71#define TRUE 1
72
73
74
75
76
77
78
79
80
81typedef uint8_t CHAR;
82typedef uint8_t BYTE;
83typedef uint16_t WORD;
84typedef uint32_t DWORD;
85typedef int BOOL;
86
87
88
89
90
91
92
93
94
95static char *ExtractHex(DWORD *value, char *getPtr);
96static char *ExtractDecimal(DWORD *value, char *getPtr);
97static void ExtractNumber(DWORD *value, char *getPtr);
98static BYTE *ExtractWord(WORD *value, BYTE *buffer);
99static BYTE *ExtractLong(DWORD *value, BYTE *buffer);
100static BYTE *ExtractBlock(WORD count, BYTE *data, BYTE *buffer);
101static char *WriteHex(char *pa, BYTE value, WORD *pCheckSum);
102static char *BuildSRecord(char *pa, WORD sType, DWORD addr,
103 const BYTE *data, int nCount);
104static void ConvertELF(char *fileName, DWORD loadOffset);
105int main(int argc, char *argv[]);
106
107
108
109
110
111static 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 }
129 *value = num;
130 return getPtr;
131}
132
133static 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 }
149 *value = num;
150 return getPtr;
151}
152
153
154static 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 }
163 if ((*getPtr == '0') && ((*(getPtr+1) == 'x') || (*(getPtr+1) == 'X'))) {
164 getPtr +=2;
165 (void)ExtractHex(value, getPtr);
166 }
167 else {
168 (void)ExtractDecimal(value, getPtr);
169 }
170 if (neg) *value = -(*value);
171}
172
173
174static 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}
182
183
184static 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}
194
195
196static BYTE* ExtractBlock(WORD count, BYTE* data, BYTE* buffer)
197{
198 while (count--) *data++ = *buffer++;
199 return buffer;
200}
201
202
203static 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
218static 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 }
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
251 for (i = 1; i <= addrLen; i++) {
252 pa = WriteHex(pa, (BYTE)(addr >> (8 * (addrLen - i))), &checkSum);
253 }
254
255
256 for (i = 0; i < nCount; i++) {
257 pa = WriteHex(pa, *data++, &checkSum);
258 }
259
260
261 checkSum = ~checkSum;
262 pa = WriteHex(pa, (BYTE)checkSum, &checkSum);
263 *pa++ = '\0';
264 return pa;
265}
266
267
268static 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
286 if ((file = fopen(fileName,"rb")) == NULL) {
287 fprintf (stderr, "Can't open %s: %s\n", fileName, strerror(errno));
288 return;
289 }
290
291
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 }
318
319
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]) {
334 fclose(file);
335 fprintf (stderr, "*** illegal file format\n");
336 return;
337 }
338 }
339
340 if ((hdr_name = strrchr(fileName, '/')) == NULL) {
341 hdr_name = fileName;
342 } else {
343 ++hdr_name;
344 }
345
346 (void)BuildSRecord(srecLine, 0, 0, (BYTE *)hdr_name, strlen(hdr_name));
347 printf("%s\r\n",srecLine);
348
349
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 }
361 else {
362 loadAddr = sectHeader[i].sh_offset + loadDiff;
363 }
364
365 if (loadAddr < firstAddr)
366 firstAddr = loadAddr;
367
368
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 }
378 (void)BuildSRecord(srecLine, 3, loadAddr + loadOffset, rxBlock, rxCount);
379 loadSize -= rxCount;
380 loadAddr += rxCount;
381 printf("%s\r\n",srecLine);
382 }
383 }
384 }
385
386
387 (void)BuildSRecord(srecLine, 7, firstAddr + loadOffset, 0, 0);
388 printf("%s\r\n",srecLine);
389 fclose(file);
390}
391
392
393
394
395
396
397int main( int argc, char *argv[ ])
398{
399 DWORD offset;
400
401 if (argc == 2) {
402 ConvertELF(argv[1], 0);
403 }
404 else if ((argc == 4) && (strcmp(argv[1], "-o") == 0)) {
405 ExtractNumber(&offset, argv[2]);
406 ConvertELF(argv[3], offset);
407 }
408 else {
409 fprintf (stderr, "Usage: img2srec [-o offset] <image>\n");
410 }
411
412 return 0;
413}
414
