1 /*-
2 * Copyright (c) 1994 Sean Eric Fagan
3 * Copyright (c) 1994 Søren Schmidt
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer
11 * in this position and unchanged.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote products
16 * derived from this software without specific prior written permission
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
28 */
29
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD: releng/8.2/sys/i386/ibcs2/imgact_coff.c 199583 2009-11-20 15:27:52Z jhb $");
32
33 #include <sys/param.h>
34 #include <sys/systm.h>
35 #include <sys/exec.h>
36 #include <sys/fcntl.h>
37 #include <sys/imgact.h>
38 #include <sys/kernel.h>
39 #include <sys/lock.h>
40 #include <sys/malloc.h>
41 #include <sys/mman.h>
42 #include <sys/mount.h>
43 #include <sys/namei.h>
44 #include <sys/vnode.h>
45
46 #include <vm/vm.h>
47 #include <vm/pmap.h>
48 #include <vm/vm_map.h>
49 #include <vm/vm_kern.h>
50 #include <vm/vm_extern.h>
51
52 #include <i386/ibcs2/coff.h>
53 #include <i386/ibcs2/ibcs2_util.h>
54
55 MODULE_DEPEND(coff, ibcs2, 1, 1, 1);
56
57 extern struct sysentvec ibcs2_svr3_sysvec;
58
59 static int coff_load_file(struct thread *td, char *name);
60 static int exec_coff_imgact(struct image_params *imgp);
61
62 static int load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot);
63
64 static int
65 load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset,
66 caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
67 {
68 size_t map_len;
69 vm_offset_t map_offset;
70 vm_offset_t map_addr;
71 int error;
72 unsigned char *data_buf = 0;
73 size_t copy_len;
74
75 map_offset = trunc_page(offset);
76 map_addr = trunc_page((vm_offset_t)vmaddr);
77
78 if (memsz > filsz) {
79 /*
80 * We have the stupid situation that
81 * the section is longer than it is on file,
82 * which means it has zero-filled areas, and
83 * we have to work for it. Stupid iBCS!
84 */
85 map_len = trunc_page(offset + filsz) - trunc_page(map_offset);
86 } else {
87 /*
88 * The only stuff we care about is on disk, and we
89 * don't care if we map in more than is really there.
90 */
91 map_len = round_page(offset + filsz) - trunc_page(map_offset);
92 }
93
94 DPRINTF(("%s(%d): vm_mmap(&vmspace->vm_map, &0x%08lx, 0x%x, 0x%x, "
95 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, 0x%x)\n",
96 __FILE__, __LINE__, map_addr, map_len, prot, map_offset));
97
98 if ((error = vm_mmap(&vmspace->vm_map,
99 &map_addr,
100 map_len,
101 prot,
102 VM_PROT_ALL,
103 MAP_PRIVATE | MAP_FIXED,
104 OBJT_VNODE,
105 vp,
106 map_offset)) != 0)
107 return error;
108
109 if (memsz == filsz) {
110 /* We're done! */
111 return 0;
112 }
113
114 /*
115 * Now we have screwball stuff, to accomodate stupid COFF.
116 * We have to map the remaining bit of the file into the kernel's
117 * memory map, allocate some anonymous memory, copy that last
118 * bit into it, and then we're done. *sigh*
119 * For clean-up reasons, we actally map in the file last.
120 */
121
122 copy_len = (offset + filsz) - trunc_page(offset + filsz);
123 map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
124 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
125
126 DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx,0x%x, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n", __FILE__, __LINE__, map_addr, map_len));
127
128 if (map_len != 0) {
129 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr,
130 map_len, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
131 if (error)
132 return error;
133 }
134
135 if ((error = vm_mmap(kernel_map,
136 (vm_offset_t *) &data_buf,
137 PAGE_SIZE,
138 VM_PROT_READ,
139 VM_PROT_READ,
140 0,
141 OBJT_VNODE,
142 vp,
143 trunc_page(offset + filsz))) != 0)
144 return error;
145
146 error = copyout(data_buf, (caddr_t) map_addr, copy_len);
147
148 if (vm_map_remove(kernel_map,
149 (vm_offset_t) data_buf,
150 (vm_offset_t) data_buf + PAGE_SIZE))
151 panic("load_coff_section vm_map_remove failed");
152
153 return error;
154 }
155
156 static int
157 coff_load_file(struct thread *td, char *name)
158 {
159 struct proc *p = td->td_proc;
160 struct vmspace *vmspace = p->p_vmspace;
161 int error;
162 struct nameidata nd;
163 struct vnode *vp;
164 struct vattr attr;
165 struct filehdr *fhdr;
166 struct aouthdr *ahdr;
167 struct scnhdr *scns;
168 char *ptr = 0;
169 int nscns;
170 unsigned long text_offset = 0, text_address = 0, text_size = 0;
171 unsigned long data_offset = 0, data_address = 0, data_size = 0;
172 unsigned long bss_size = 0;
173 int i;
174
175 NDINIT(&nd, LOOKUP, ISOPEN | LOCKLEAF | FOLLOW | SAVENAME,
176 UIO_SYSSPACE, name, td);
177
178 error = namei(&nd);
179 if (error)
180 return error;
181
182 vp = nd.ni_vp;
183 if (vp == NULL)
184 return ENOEXEC;
185
186 if (vp->v_writecount) {
187 error = ETXTBSY;
188 goto fail;
189 }
190
191 if ((error = VOP_GETATTR(vp, &attr, td->td_ucred)) != 0)
192 goto fail;
193
194 if ((vp->v_mount->mnt_flag & MNT_NOEXEC)
195 || ((attr.va_mode & 0111) == 0)
196 || (attr.va_type != VREG))
197 goto fail;
198
199 if (attr.va_size == 0) {
200 error = ENOEXEC;
201 goto fail;
202 }
203
204 if ((error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td)) != 0)
205 goto fail;
206
207 if ((error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL)) != 0)
208 goto fail;
209
210 /*
211 * Lose the lock on the vnode. It's no longer needed, and must not
212 * exist for the pagefault paging to work below.
213 */
214 VOP_UNLOCK(vp, 0);
215
216 if ((error = vm_mmap(kernel_map,
217 (vm_offset_t *) &ptr,
218 PAGE_SIZE,
219 VM_PROT_READ,
220 VM_PROT_READ,
221 0,
222 OBJT_VNODE,
223 vp,
224 0)) != 0)
225 goto unlocked_fail;
226
227 fhdr = (struct filehdr *)ptr;
228
229 if (fhdr->f_magic != I386_COFF) {
230 error = ENOEXEC;
231 goto dealloc_and_fail;
232 }
233
234 nscns = fhdr->f_nscns;
235
236 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
237 /*
238 * XXX -- just fail. I'm so lazy.
239 */
240 error = ENOEXEC;
241 goto dealloc_and_fail;
242 }
243
244 ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr));
245
246 scns = (struct scnhdr*)(ptr + sizeof(struct filehdr)
247 + sizeof(struct aouthdr));
248
249 for (i = 0; i < nscns; i++) {
250 if (scns[i].s_flags & STYP_NOLOAD)
251 continue;
252 else if (scns[i].s_flags & STYP_TEXT) {
253 text_address = scns[i].s_vaddr;
254 text_size = scns[i].s_size;
255 text_offset = scns[i].s_scnptr;
256 }
257 else if (scns[i].s_flags & STYP_DATA) {
258 data_address = scns[i].s_vaddr;
259 data_size = scns[i].s_size;
260 data_offset = scns[i].s_scnptr;
261 } else if (scns[i].s_flags & STYP_BSS) {
262 bss_size = scns[i].s_size;
263 }
264 }
265
266 if ((error = load_coff_section(vmspace, vp, text_offset,
267 (caddr_t)(void *)(uintptr_t)text_address,
268 text_size, text_size,
269 VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
270 goto dealloc_and_fail;
271 }
272 if ((error = load_coff_section(vmspace, vp, data_offset,
273 (caddr_t)(void *)(uintptr_t)data_address,
274 data_size + bss_size, data_size,
275 VM_PROT_ALL)) != 0) {
276 goto dealloc_and_fail;
277 }
278
279 error = 0;
280
281 dealloc_and_fail:
282 if (vm_map_remove(kernel_map,
283 (vm_offset_t) ptr,
284 (vm_offset_t) ptr + PAGE_SIZE))
285 panic("%s vm_map_remove failed", __func__);
286
287 fail:
288 VOP_UNLOCK(vp, 0);
289 unlocked_fail:
290 NDFREE(&nd, NDF_ONLY_PNBUF);
291 vrele(nd.ni_vp);
292 return error;
293 }
294
295 static int
296 exec_coff_imgact(imgp)
297 struct image_params *imgp;
298 {
299 const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header;
300 const struct aouthdr *ahdr;
301 const struct scnhdr *scns;
302 int i;
303 struct vmspace *vmspace;
304 int nscns;
305 int error;
306 unsigned long text_offset = 0, text_address = 0, text_size = 0;
307 unsigned long data_offset = 0, data_address = 0, data_size = 0;
308 unsigned long bss_size = 0;
309 caddr_t hole;
310
311 if (fhdr->f_magic != I386_COFF ||
312 !(fhdr->f_flags & F_EXEC)) {
313
314 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
315 return -1;
316 }
317
318 nscns = fhdr->f_nscns;
319 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
320 /*
321 * For now, return an error -- need to be able to
322 * read in all of the section structures.
323 */
324
325 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
326 return -1;
327 }
328
329 ahdr = (const struct aouthdr*)
330 ((const char*)(imgp->image_header) + sizeof(struct filehdr));
331 imgp->entry_addr = ahdr->entry;
332
333 scns = (const struct scnhdr*)
334 ((const char*)(imgp->image_header) + sizeof(struct filehdr) +
335 sizeof(struct aouthdr));
336
337 VOP_UNLOCK(imgp->vp, 0);
338
339 error = exec_new_vmspace(imgp, &ibcs2_svr3_sysvec);
340 if (error)
341 goto fail;
342 vmspace = imgp->proc->p_vmspace;
343
344 for (i = 0; i < nscns; i++) {
345
346 DPRINTF(("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, "
347 "scns[i].s_scnptr = %d\n", i, scns[i].s_name,
348 scns[i].s_vaddr, scns[i].s_scnptr));
349 if (scns[i].s_flags & STYP_NOLOAD) {
350 /*
351 * A section that is not loaded, for whatever
352 * reason. It takes precedance over other flag
353 * bits...
354 */
355 continue;
356 } else if (scns[i].s_flags & STYP_TEXT) {
357 text_address = scns[i].s_vaddr;
358 text_size = scns[i].s_size;
359 text_offset = scns[i].s_scnptr;
360 } else if (scns[i].s_flags & STYP_DATA) {
361 /* .data section */
362 data_address = scns[i].s_vaddr;
363 data_size = scns[i].s_size;
364 data_offset = scns[i].s_scnptr;
365 } else if (scns[i].s_flags & STYP_BSS) {
366 /* .bss section */
367 bss_size = scns[i].s_size;
368 } else if (scns[i].s_flags & STYP_LIB) {
369 char *buf = 0;
370 int foff = trunc_page(scns[i].s_scnptr);
371 int off = scns[i].s_scnptr - foff;
372 int len = round_page(scns[i].s_size + PAGE_SIZE);
373 int j;
374
375 if ((error = vm_mmap(kernel_map,
376 (vm_offset_t *) &buf,
377 len,
378 VM_PROT_READ,
379 VM_PROT_READ,
380 0,
381 OBJT_VNODE,
382 imgp->vp,
383 foff)) != 0) {
384 error = ENOEXEC;
385 goto fail;
386 }
387 if(scns[i].s_size) {
388 char *libbuf;
389 int emul_path_len = strlen(ibcs2_emul_path);
390
391 libbuf = malloc(MAXPATHLEN + emul_path_len,
392 M_TEMP, M_WAITOK);
393 strcpy(libbuf, ibcs2_emul_path);
394
395 for (j = off; j < scns[i].s_size + off;) {
396 long stroff, nextoff;
397 char *libname;
398
399 nextoff = 4 * *(long *)(buf + j);
400 stroff = 4 * *(long *)(buf + j + sizeof(long));
401
402 libname = buf + j + stroff;
403 j += nextoff;
404
405 DPRINTF(("%s(%d): shared library %s\n",
406 __FILE__, __LINE__, libname));
407 strlcpy(&libbuf[emul_path_len], libname, MAXPATHLEN);
408 error = coff_load_file(
409 FIRST_THREAD_IN_PROC(imgp->proc), libbuf);
410 if (error)
411 error = coff_load_file(
412 FIRST_THREAD_IN_PROC(imgp->proc),
413 libname);
414 if (error)
415 break;
416 }
417 free(libbuf, M_TEMP);
418 }
419 if (vm_map_remove(kernel_map,
420 (vm_offset_t) buf,
421 (vm_offset_t) buf + len))
422 panic("exec_coff_imgact vm_map_remove failed");
423 if (error)
424 goto fail;
425 }
426 }
427 /*
428 * Map in .text now
429 */
430
431 DPRINTF(("%s(%d): load_coff_section(vmspace, "
432 "imgp->vp, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n",
433 __FILE__, __LINE__, text_offset, text_address,
434 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE));
435 if ((error = load_coff_section(vmspace, imgp->vp,
436 text_offset,
437 (caddr_t)(void *)(uintptr_t)text_address,
438 text_size, text_size,
439 VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
440 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
441 goto fail;
442 }
443 /*
444 * Map in .data and .bss now
445 */
446
447
448 DPRINTF(("%s(%d): load_coff_section(vmspace, "
449 "imgp->vp, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n",
450 __FILE__, __LINE__, data_offset, data_address,
451 data_size + bss_size, data_size, VM_PROT_ALL));
452 if ((error = load_coff_section(vmspace, imgp->vp,
453 data_offset,
454 (caddr_t)(void *)(uintptr_t)data_address,
455 data_size + bss_size, data_size,
456 VM_PROT_ALL)) != 0) {
457
458 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
459 goto fail;
460 }
461
462 imgp->interpreted = 0;
463 imgp->proc->p_sysent = &ibcs2_svr3_sysvec;
464
465 vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
466 vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
467 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address;
468 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address;
469
470 hole = (caddr_t)trunc_page((vm_offset_t)vmspace->vm_daddr) + ctob(vmspace->vm_dsize);
471
472
473 DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n",
474 __FILE__, __LINE__, hole));
475 DPRINTF(("imgact: error = %d\n", error));
476
477 error = vm_map_find(&vmspace->vm_map, NULL, 0,
478 (vm_offset_t *) &hole, PAGE_SIZE, FALSE,
479 VM_PROT_ALL, VM_PROT_ALL, 0);
480
481 DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n",
482 ctob(vmspace->vm_dsize), vmspace->vm_daddr,
483 ctob(vmspace->vm_dsize) + vmspace->vm_daddr ));
484 DPRINTF(("%s(%d): returning successfully!\n", __FILE__, __LINE__));
485
486 fail:
487 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
488
489 return error;
490 }
491
492 /*
493 * Tell kern_execve.c about it, with a little help from the linker.
494 */
495 static struct execsw coff_execsw = { exec_coff_imgact, "coff" };
496 EXEC_SET(coff, coff_execsw);
Cache object: 9d5e2cba66ad48a80649b38628c5dd2a
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