1 | /* |
2 | * Copyright (c) 1995 |
3 | * Ted Lemon (hereinafter referred to as the author) |
4 | * |
5 | * Redistribution and use in source and binary forms, with or without |
6 | * modification, are permitted provided that the following conditions |
7 | * are met: |
8 | * 1. Redistributions of source code must retain the above copyright |
9 | * notice, this list of conditions and the following disclaimer. |
10 | * 2. Redistributions in binary form must reproduce the above copyright |
11 | * notice, this list of conditions and the following disclaimer in the |
12 | * documentation and/or other materials provided with the distribution. |
13 | * 3. The name of the author may not be used to endorse or promote products |
14 | * derived from this software without specific prior written permission. |
15 | * |
16 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND |
17 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
18 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
19 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE |
20 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
21 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
22 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
23 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
24 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
25 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
26 | * SUCH DAMAGE. |
27 | */ |
28 | |
29 | /* elf2ecoff.c |
30 | |
31 | This program converts an elf executable to an ECOFF executable. |
32 | No symbol table is retained. This is useful primarily in building |
33 | net-bootable kernels for machines (e.g., DECstation and Alpha) which |
34 | only support the ECOFF object file format. */ |
35 | |
36 | #include <stdio.h> |
37 | #include <string.h> |
38 | #include <errno.h> |
39 | #include <sys/types.h> |
40 | #include <fcntl.h> |
41 | #include <unistd.h> |
42 | #include <elf.h> |
43 | #include <limits.h> |
44 | #include <netinet/in.h> |
45 | #include <stdlib.h> |
46 | #include <stdint.h> |
47 | #include <inttypes.h> |
48 | |
49 | #include "ecoff.h" |
50 | |
51 | /* |
52 | * Some extra ELF definitions |
53 | */ |
54 | #define PT_MIPS_REGINFO 0x70000000 /* Register usage information */ |
55 | #define PT_MIPS_ABIFLAGS 0x70000003 /* Records ABI related flags */ |
56 | |
57 | /* -------------------------------------------------------------------- */ |
58 | |
59 | struct sect { |
60 | uint32_t vaddr; |
61 | uint32_t len; |
62 | }; |
63 | |
64 | int *symTypeTable; |
65 | int must_convert_endian; |
66 | int format_bigendian; |
67 | |
68 | static void copy(int out, int in, off_t offset, off_t size) |
69 | { |
70 | char ibuf[4096]; |
71 | int remaining, cur, count; |
72 | |
73 | /* Go to the start of the ELF symbol table... */ |
74 | if (lseek(in, offset, SEEK_SET) < 0) { |
75 | perror("copy: lseek" ); |
76 | exit(1); |
77 | } |
78 | |
79 | remaining = size; |
80 | while (remaining) { |
81 | cur = remaining; |
82 | if (cur > sizeof ibuf) |
83 | cur = sizeof ibuf; |
84 | remaining -= cur; |
85 | if ((count = read(in, ibuf, cur)) != cur) { |
86 | fprintf(stderr, "copy: read: %s\n" , |
87 | count ? strerror(errno) : |
88 | "premature end of file" ); |
89 | exit(1); |
90 | } |
91 | if ((count = write(out, ibuf, cur)) != cur) { |
92 | perror("copy: write" ); |
93 | exit(1); |
94 | } |
95 | } |
96 | } |
97 | |
98 | /* |
99 | * Combine two segments, which must be contiguous. If pad is true, it's |
100 | * okay for there to be padding between. |
101 | */ |
102 | static void combine(struct sect *base, struct sect *new, int pad) |
103 | { |
104 | if (!base->len) |
105 | *base = *new; |
106 | else if (new->len) { |
107 | if (base->vaddr + base->len != new->vaddr) { |
108 | if (pad) |
109 | base->len = new->vaddr - base->vaddr; |
110 | else { |
111 | fprintf(stderr, |
112 | "Non-contiguous data can't be converted.\n" ); |
113 | exit(1); |
114 | } |
115 | } |
116 | base->len += new->len; |
117 | } |
118 | } |
119 | |
120 | static int phcmp(const void *v1, const void *v2) |
121 | { |
122 | const Elf32_Phdr *h1 = v1; |
123 | const Elf32_Phdr *h2 = v2; |
124 | |
125 | if (h1->p_vaddr > h2->p_vaddr) |
126 | return 1; |
127 | else if (h1->p_vaddr < h2->p_vaddr) |
128 | return -1; |
129 | else |
130 | return 0; |
131 | } |
132 | |
133 | static char *saveRead(int file, off_t offset, off_t len, char *name) |
134 | { |
135 | char *tmp; |
136 | int count; |
137 | off_t off; |
138 | if ((off = lseek(file, offset, SEEK_SET)) < 0) { |
139 | fprintf(stderr, "%s: fseek: %s\n" , name, strerror(errno)); |
140 | exit(1); |
141 | } |
142 | if (!(tmp = (char *) malloc(len))) { |
143 | fprintf(stderr, "%s: Can't allocate %ld bytes.\n" , name, |
144 | len); |
145 | exit(1); |
146 | } |
147 | count = read(file, tmp, len); |
148 | if (count != len) { |
149 | fprintf(stderr, "%s: read: %s.\n" , |
150 | name, |
151 | count ? strerror(errno) : "End of file reached" ); |
152 | exit(1); |
153 | } |
154 | return tmp; |
155 | } |
156 | |
157 | #define swab16(x) \ |
158 | ((uint16_t)( \ |
159 | (((uint16_t)(x) & (uint16_t)0x00ffU) << 8) | \ |
160 | (((uint16_t)(x) & (uint16_t)0xff00U) >> 8) )) |
161 | |
162 | #define swab32(x) \ |
163 | ((unsigned int)( \ |
164 | (((uint32_t)(x) & (uint32_t)0x000000ffUL) << 24) | \ |
165 | (((uint32_t)(x) & (uint32_t)0x0000ff00UL) << 8) | \ |
166 | (((uint32_t)(x) & (uint32_t)0x00ff0000UL) >> 8) | \ |
167 | (((uint32_t)(x) & (uint32_t)0xff000000UL) >> 24) )) |
168 | |
169 | static void convert_elf_hdr(Elf32_Ehdr * e) |
170 | { |
171 | e->e_type = swab16(e->e_type); |
172 | e->e_machine = swab16(e->e_machine); |
173 | e->e_version = swab32(e->e_version); |
174 | e->e_entry = swab32(e->e_entry); |
175 | e->e_phoff = swab32(e->e_phoff); |
176 | e->e_shoff = swab32(e->e_shoff); |
177 | e->e_flags = swab32(e->e_flags); |
178 | e->e_ehsize = swab16(e->e_ehsize); |
179 | e->e_phentsize = swab16(e->e_phentsize); |
180 | e->e_phnum = swab16(e->e_phnum); |
181 | e->e_shentsize = swab16(e->e_shentsize); |
182 | e->e_shnum = swab16(e->e_shnum); |
183 | e->e_shstrndx = swab16(e->e_shstrndx); |
184 | } |
185 | |
186 | static void convert_elf_phdrs(Elf32_Phdr * p, int num) |
187 | { |
188 | int i; |
189 | |
190 | for (i = 0; i < num; i++, p++) { |
191 | p->p_type = swab32(p->p_type); |
192 | p->p_offset = swab32(p->p_offset); |
193 | p->p_vaddr = swab32(p->p_vaddr); |
194 | p->p_paddr = swab32(p->p_paddr); |
195 | p->p_filesz = swab32(p->p_filesz); |
196 | p->p_memsz = swab32(p->p_memsz); |
197 | p->p_flags = swab32(p->p_flags); |
198 | p->p_align = swab32(p->p_align); |
199 | } |
200 | |
201 | } |
202 | |
203 | static void convert_elf_shdrs(Elf32_Shdr * s, int num) |
204 | { |
205 | int i; |
206 | |
207 | for (i = 0; i < num; i++, s++) { |
208 | s->sh_name = swab32(s->sh_name); |
209 | s->sh_type = swab32(s->sh_type); |
210 | s->sh_flags = swab32(s->sh_flags); |
211 | s->sh_addr = swab32(s->sh_addr); |
212 | s->sh_offset = swab32(s->sh_offset); |
213 | s->sh_size = swab32(s->sh_size); |
214 | s->sh_link = swab32(s->sh_link); |
215 | s->sh_info = swab32(s->sh_info); |
216 | s->sh_addralign = swab32(s->sh_addralign); |
217 | s->sh_entsize = swab32(s->sh_entsize); |
218 | } |
219 | } |
220 | |
221 | static void convert_ecoff_filehdr(struct filehdr *f) |
222 | { |
223 | f->f_magic = swab16(f->f_magic); |
224 | f->f_nscns = swab16(f->f_nscns); |
225 | f->f_timdat = swab32(f->f_timdat); |
226 | f->f_symptr = swab32(f->f_symptr); |
227 | f->f_nsyms = swab32(f->f_nsyms); |
228 | f->f_opthdr = swab16(f->f_opthdr); |
229 | f->f_flags = swab16(f->f_flags); |
230 | } |
231 | |
232 | static void convert_ecoff_aouthdr(struct aouthdr *a) |
233 | { |
234 | a->magic = swab16(a->magic); |
235 | a->vstamp = swab16(a->vstamp); |
236 | a->tsize = swab32(a->tsize); |
237 | a->dsize = swab32(a->dsize); |
238 | a->bsize = swab32(a->bsize); |
239 | a->entry = swab32(a->entry); |
240 | a->text_start = swab32(a->text_start); |
241 | a->data_start = swab32(a->data_start); |
242 | a->bss_start = swab32(a->bss_start); |
243 | a->gprmask = swab32(a->gprmask); |
244 | a->cprmask[0] = swab32(a->cprmask[0]); |
245 | a->cprmask[1] = swab32(a->cprmask[1]); |
246 | a->cprmask[2] = swab32(a->cprmask[2]); |
247 | a->cprmask[3] = swab32(a->cprmask[3]); |
248 | a->gp_value = swab32(a->gp_value); |
249 | } |
250 | |
251 | static void convert_ecoff_esecs(struct scnhdr *s, int num) |
252 | { |
253 | int i; |
254 | |
255 | for (i = 0; i < num; i++, s++) { |
256 | s->s_paddr = swab32(s->s_paddr); |
257 | s->s_vaddr = swab32(s->s_vaddr); |
258 | s->s_size = swab32(s->s_size); |
259 | s->s_scnptr = swab32(s->s_scnptr); |
260 | s->s_relptr = swab32(s->s_relptr); |
261 | s->s_lnnoptr = swab32(s->s_lnnoptr); |
262 | s->s_nreloc = swab16(s->s_nreloc); |
263 | s->s_nlnno = swab16(s->s_nlnno); |
264 | s->s_flags = swab32(s->s_flags); |
265 | } |
266 | } |
267 | |
268 | int main(int argc, char *argv[]) |
269 | { |
270 | Elf32_Ehdr ex; |
271 | Elf32_Phdr *ph; |
272 | Elf32_Shdr *sh; |
273 | int i, pad; |
274 | struct sect text, data, bss; |
275 | struct filehdr efh; |
276 | struct aouthdr eah; |
277 | struct scnhdr esecs[6]; |
278 | int infile, outfile; |
279 | uint32_t cur_vma = UINT32_MAX; |
280 | int addflag = 0; |
281 | int nosecs; |
282 | |
283 | text.len = data.len = bss.len = 0; |
284 | text.vaddr = data.vaddr = bss.vaddr = 0; |
285 | |
286 | /* Check args... */ |
287 | if (argc < 3 || argc > 4) { |
288 | usage: |
289 | fprintf(stderr, |
290 | "usage: elf2ecoff <elf executable> <ecoff executable> [-a]\n" ); |
291 | exit(1); |
292 | } |
293 | if (argc == 4) { |
294 | if (strcmp(argv[3], "-a" )) |
295 | goto usage; |
296 | addflag = 1; |
297 | } |
298 | |
299 | /* Try the input file... */ |
300 | if ((infile = open(argv[1], O_RDONLY)) < 0) { |
301 | fprintf(stderr, "Can't open %s for read: %s\n" , |
302 | argv[1], strerror(errno)); |
303 | exit(1); |
304 | } |
305 | |
306 | /* Read the header, which is at the beginning of the file... */ |
307 | i = read(infile, &ex, sizeof ex); |
308 | if (i != sizeof ex) { |
309 | fprintf(stderr, "ex: %s: %s.\n" , |
310 | argv[1], |
311 | i ? strerror(errno) : "End of file reached" ); |
312 | exit(1); |
313 | } |
314 | |
315 | if (ex.e_ident[EI_DATA] == ELFDATA2MSB) |
316 | format_bigendian = 1; |
317 | |
318 | if (ntohs(0xaa55) == 0xaa55) { |
319 | if (!format_bigendian) |
320 | must_convert_endian = 1; |
321 | } else { |
322 | if (format_bigendian) |
323 | must_convert_endian = 1; |
324 | } |
325 | if (must_convert_endian) |
326 | convert_elf_hdr(&ex); |
327 | |
328 | /* Read the program headers... */ |
329 | ph = (Elf32_Phdr *) saveRead(infile, ex.e_phoff, |
330 | ex.e_phnum * sizeof(Elf32_Phdr), |
331 | "ph" ); |
332 | if (must_convert_endian) |
333 | convert_elf_phdrs(ph, ex.e_phnum); |
334 | /* Read the section headers... */ |
335 | sh = (Elf32_Shdr *) saveRead(infile, ex.e_shoff, |
336 | ex.e_shnum * sizeof(Elf32_Shdr), |
337 | "sh" ); |
338 | if (must_convert_endian) |
339 | convert_elf_shdrs(sh, ex.e_shnum); |
340 | |
341 | /* Figure out if we can cram the program header into an ECOFF |
342 | header... Basically, we can't handle anything but loadable |
343 | segments, but we can ignore some kinds of segments. We can't |
344 | handle holes in the address space. Segments may be out of order, |
345 | so we sort them first. */ |
346 | |
347 | qsort(ph, ex.e_phnum, sizeof(Elf32_Phdr), phcmp); |
348 | |
349 | for (i = 0; i < ex.e_phnum; i++) { |
350 | /* Section types we can ignore... */ |
351 | switch (ph[i].p_type) { |
352 | case PT_NULL: |
353 | case PT_NOTE: |
354 | case PT_PHDR: |
355 | case PT_MIPS_REGINFO: |
356 | case PT_MIPS_ABIFLAGS: |
357 | continue; |
358 | |
359 | case PT_LOAD: |
360 | /* Writable (data) segment? */ |
361 | if (ph[i].p_flags & PF_W) { |
362 | struct sect ndata, nbss; |
363 | |
364 | ndata.vaddr = ph[i].p_vaddr; |
365 | ndata.len = ph[i].p_filesz; |
366 | nbss.vaddr = ph[i].p_vaddr + ph[i].p_filesz; |
367 | nbss.len = ph[i].p_memsz - ph[i].p_filesz; |
368 | |
369 | combine(&data, &ndata, 0); |
370 | combine(&bss, &nbss, 1); |
371 | } else { |
372 | struct sect ntxt; |
373 | |
374 | ntxt.vaddr = ph[i].p_vaddr; |
375 | ntxt.len = ph[i].p_filesz; |
376 | |
377 | combine(&text, &ntxt, 0); |
378 | } |
379 | /* Remember the lowest segment start address. */ |
380 | if (ph[i].p_vaddr < cur_vma) |
381 | cur_vma = ph[i].p_vaddr; |
382 | break; |
383 | |
384 | default: |
385 | /* Section types we can't handle... */ |
386 | fprintf(stderr, |
387 | "Program header %d type %d can't be converted.\n" , |
388 | ex.e_phnum, ph[i].p_type); |
389 | exit(1); |
390 | } |
391 | } |
392 | |
393 | /* Sections must be in order to be converted... */ |
394 | if (text.vaddr > data.vaddr || data.vaddr > bss.vaddr || |
395 | text.vaddr + text.len > data.vaddr |
396 | || data.vaddr + data.len > bss.vaddr) { |
397 | fprintf(stderr, |
398 | "Sections ordering prevents a.out conversion.\n" ); |
399 | exit(1); |
400 | } |
401 | |
402 | /* If there's a data section but no text section, then the loader |
403 | combined everything into one section. That needs to be the |
404 | text section, so just make the data section zero length following |
405 | text. */ |
406 | if (data.len && !text.len) { |
407 | text = data; |
408 | data.vaddr = text.vaddr + text.len; |
409 | data.len = 0; |
410 | } |
411 | |
412 | /* If there is a gap between text and data, we'll fill it when we copy |
413 | the data, so update the length of the text segment as represented in |
414 | a.out to reflect that, since a.out doesn't allow gaps in the program |
415 | address space. */ |
416 | if (text.vaddr + text.len < data.vaddr) |
417 | text.len = data.vaddr - text.vaddr; |
418 | |
419 | /* We now have enough information to cons up an a.out header... */ |
420 | eah.magic = OMAGIC; |
421 | eah.vstamp = 200; |
422 | eah.tsize = text.len; |
423 | eah.dsize = data.len; |
424 | eah.bsize = bss.len; |
425 | eah.entry = ex.e_entry; |
426 | eah.text_start = text.vaddr; |
427 | eah.data_start = data.vaddr; |
428 | eah.bss_start = bss.vaddr; |
429 | eah.gprmask = 0xf3fffffe; |
430 | memset(&eah.cprmask, '\0', sizeof eah.cprmask); |
431 | eah.gp_value = 0; /* unused. */ |
432 | |
433 | if (format_bigendian) |
434 | efh.f_magic = MIPSEBMAGIC; |
435 | else |
436 | efh.f_magic = MIPSELMAGIC; |
437 | if (addflag) |
438 | nosecs = 6; |
439 | else |
440 | nosecs = 3; |
441 | efh.f_nscns = nosecs; |
442 | efh.f_timdat = 0; /* bogus */ |
443 | efh.f_symptr = 0; |
444 | efh.f_nsyms = 0; |
445 | efh.f_opthdr = sizeof eah; |
446 | efh.f_flags = 0x100f; /* Stripped, not shareable. */ |
447 | |
448 | memset(esecs, 0, sizeof esecs); |
449 | strcpy(esecs[0].s_name, ".text" ); |
450 | strcpy(esecs[1].s_name, ".data" ); |
451 | strcpy(esecs[2].s_name, ".bss" ); |
452 | if (addflag) { |
453 | strcpy(esecs[3].s_name, ".rdata" ); |
454 | strcpy(esecs[4].s_name, ".sdata" ); |
455 | strcpy(esecs[5].s_name, ".sbss" ); |
456 | } |
457 | esecs[0].s_paddr = esecs[0].s_vaddr = eah.text_start; |
458 | esecs[1].s_paddr = esecs[1].s_vaddr = eah.data_start; |
459 | esecs[2].s_paddr = esecs[2].s_vaddr = eah.bss_start; |
460 | if (addflag) { |
461 | esecs[3].s_paddr = esecs[3].s_vaddr = 0; |
462 | esecs[4].s_paddr = esecs[4].s_vaddr = 0; |
463 | esecs[5].s_paddr = esecs[5].s_vaddr = 0; |
464 | } |
465 | esecs[0].s_size = eah.tsize; |
466 | esecs[1].s_size = eah.dsize; |
467 | esecs[2].s_size = eah.bsize; |
468 | if (addflag) { |
469 | esecs[3].s_size = 0; |
470 | esecs[4].s_size = 0; |
471 | esecs[5].s_size = 0; |
472 | } |
473 | esecs[0].s_scnptr = N_TXTOFF(efh, eah); |
474 | esecs[1].s_scnptr = N_DATOFF(efh, eah); |
475 | #define ECOFF_SEGMENT_ALIGNMENT(a) 0x10 |
476 | #define ECOFF_ROUND(s, a) (((s)+(a)-1)&~((a)-1)) |
477 | esecs[2].s_scnptr = esecs[1].s_scnptr + |
478 | ECOFF_ROUND(esecs[1].s_size, ECOFF_SEGMENT_ALIGNMENT(&eah)); |
479 | if (addflag) { |
480 | esecs[3].s_scnptr = 0; |
481 | esecs[4].s_scnptr = 0; |
482 | esecs[5].s_scnptr = 0; |
483 | } |
484 | esecs[0].s_relptr = esecs[1].s_relptr = esecs[2].s_relptr = 0; |
485 | esecs[0].s_lnnoptr = esecs[1].s_lnnoptr = esecs[2].s_lnnoptr = 0; |
486 | esecs[0].s_nreloc = esecs[1].s_nreloc = esecs[2].s_nreloc = 0; |
487 | esecs[0].s_nlnno = esecs[1].s_nlnno = esecs[2].s_nlnno = 0; |
488 | if (addflag) { |
489 | esecs[3].s_relptr = esecs[4].s_relptr |
490 | = esecs[5].s_relptr = 0; |
491 | esecs[3].s_lnnoptr = esecs[4].s_lnnoptr |
492 | = esecs[5].s_lnnoptr = 0; |
493 | esecs[3].s_nreloc = esecs[4].s_nreloc = esecs[5].s_nreloc = |
494 | 0; |
495 | esecs[3].s_nlnno = esecs[4].s_nlnno = esecs[5].s_nlnno = 0; |
496 | } |
497 | esecs[0].s_flags = 0x20; |
498 | esecs[1].s_flags = 0x40; |
499 | esecs[2].s_flags = 0x82; |
500 | if (addflag) { |
501 | esecs[3].s_flags = 0x100; |
502 | esecs[4].s_flags = 0x200; |
503 | esecs[5].s_flags = 0x400; |
504 | } |
505 | |
506 | /* Make the output file... */ |
507 | if ((outfile = open(argv[2], O_WRONLY | O_CREAT, 0777)) < 0) { |
508 | fprintf(stderr, "Unable to create %s: %s\n" , argv[2], |
509 | strerror(errno)); |
510 | exit(1); |
511 | } |
512 | |
513 | if (must_convert_endian) |
514 | convert_ecoff_filehdr(f: &efh); |
515 | /* Write the headers... */ |
516 | i = write(outfile, &efh, sizeof efh); |
517 | if (i != sizeof efh) { |
518 | perror("efh: write" ); |
519 | exit(1); |
520 | |
521 | for (i = 0; i < nosecs; i++) { |
522 | printf |
523 | ("Section %d: %s phys %" PRIx32" size %" PRIx32"\t file offset %" PRIx32"\n" , |
524 | i, esecs[i].s_name, esecs[i].s_paddr, |
525 | esecs[i].s_size, esecs[i].s_scnptr); |
526 | } |
527 | } |
528 | fprintf(stderr, "wrote %d byte file header.\n" , i); |
529 | |
530 | if (must_convert_endian) |
531 | convert_ecoff_aouthdr(a: &eah); |
532 | i = write(outfile, &eah, sizeof eah); |
533 | if (i != sizeof eah) { |
534 | perror("eah: write" ); |
535 | exit(1); |
536 | } |
537 | fprintf(stderr, "wrote %d byte a.out header.\n" , i); |
538 | |
539 | if (must_convert_endian) |
540 | convert_ecoff_esecs(s: &esecs[0], num: nosecs); |
541 | i = write(outfile, &esecs, nosecs * sizeof(struct scnhdr)); |
542 | if (i != nosecs * sizeof(struct scnhdr)) { |
543 | perror("esecs: write" ); |
544 | exit(1); |
545 | } |
546 | fprintf(stderr, "wrote %d bytes of section headers.\n" , i); |
547 | |
548 | pad = (sizeof(efh) + sizeof(eah) + nosecs * sizeof(struct scnhdr)) & 15; |
549 | if (pad) { |
550 | pad = 16 - pad; |
551 | i = write(outfile, "\0\0\0\0\0\0\0\0\0\0\0\0\0\0" , pad); |
552 | if (i < 0) { |
553 | perror("ipad: write" ); |
554 | exit(1); |
555 | } |
556 | fprintf(stderr, "wrote %d byte pad.\n" , i); |
557 | } |
558 | |
559 | /* |
560 | * Copy the loadable sections. Zero-fill any gaps less than 64k; |
561 | * complain about any zero-filling, and die if we're asked to zero-fill |
562 | * more than 64k. |
563 | */ |
564 | for (i = 0; i < ex.e_phnum; i++) { |
565 | /* Unprocessable sections were handled above, so just verify that |
566 | the section can be loaded before copying. */ |
567 | if (ph[i].p_type == PT_LOAD && ph[i].p_filesz) { |
568 | if (cur_vma != ph[i].p_vaddr) { |
569 | uint32_t gap = ph[i].p_vaddr - cur_vma; |
570 | char obuf[1024]; |
571 | if (gap > 65536) { |
572 | fprintf(stderr, |
573 | "Intersegment gap (%" PRId32" bytes) too large.\n" , |
574 | gap); |
575 | exit(1); |
576 | } |
577 | fprintf(stderr, |
578 | "Warning: %d byte intersegment gap.\n" , |
579 | gap); |
580 | memset(obuf, 0, sizeof obuf); |
581 | while (gap) { |
582 | int count = |
583 | write(outfile, obuf, |
584 | (gap > |
585 | sizeof obuf ? sizeof |
586 | obuf : gap)); |
587 | if (count < 0) { |
588 | fprintf(stderr, |
589 | "Error writing gap: %s\n" , |
590 | strerror(errno)); |
591 | exit(1); |
592 | } |
593 | gap -= count; |
594 | } |
595 | } |
596 | fprintf(stderr, "writing %d bytes...\n" , |
597 | ph[i].p_filesz); |
598 | copy(outfile, infile, ph[i].p_offset, |
599 | ph[i].p_filesz); |
600 | cur_vma = ph[i].p_vaddr + ph[i].p_filesz; |
601 | } |
602 | } |
603 | |
604 | /* |
605 | * Write a page of padding for boot PROMS that read entire pages. |
606 | * Without this, they may attempt to read past the end of the |
607 | * data section, incur an error, and refuse to boot. |
608 | */ |
609 | { |
610 | char obuf[4096]; |
611 | memset(obuf, 0, sizeof obuf); |
612 | if (write(outfile, obuf, sizeof(obuf)) != sizeof(obuf)) { |
613 | fprintf(stderr, "Error writing PROM padding: %s\n" , |
614 | strerror(errno)); |
615 | exit(1); |
616 | } |
617 | } |
618 | |
619 | /* Looks like we won... */ |
620 | exit(0); |
621 | } |
622 | |