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/9.1/sys/i386/ibcs2/imgact_coff.c 232387 2012-03-02 11:32:47Z kib $");
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%08jx, 0x%x, 0x%x, "
95 "VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, OBJT_VNODE, vp, 0x%x)\n",
96 __FILE__, __LINE__, (uintmax_t)map_addr, map_len, prot,
97 map_offset));
98
99 if ((error = vm_mmap(&vmspace->vm_map,
100 &map_addr,
101 map_len,
102 prot,
103 VM_PROT_ALL,
104 MAP_PRIVATE | MAP_FIXED,
105 OBJT_VNODE,
106 vp,
107 map_offset)) != 0)
108 return error;
109
110 if (memsz == filsz) {
111 /* We're done! */
112 return 0;
113 }
114
115 /*
116 * Now we have screwball stuff, to accomodate stupid COFF.
117 * We have to map the remaining bit of the file into the kernel's
118 * memory map, allocate some anonymous memory, copy that last
119 * bit into it, and then we're done. *sigh*
120 * For clean-up reasons, we actally map in the file last.
121 */
122
123 copy_len = (offset + filsz) - trunc_page(offset + filsz);
124 map_addr = trunc_page((vm_offset_t)vmaddr + filsz);
125 map_len = round_page((vm_offset_t)vmaddr + memsz) - map_addr;
126
127 DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08jx,0x%x, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0)\n", __FILE__, __LINE__, (uintmax_t)map_addr, map_len));
128
129 if (map_len != 0) {
130 error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr,
131 map_len, VMFS_NO_SPACE, VM_PROT_ALL, VM_PROT_ALL, 0);
132 if (error)
133 return (vm_mmap_to_errno(error));
134 }
135
136 if ((error = vm_mmap(exec_map,
137 (vm_offset_t *) &data_buf,
138 PAGE_SIZE,
139 VM_PROT_READ,
140 VM_PROT_READ,
141 0,
142 OBJT_VNODE,
143 vp,
144 trunc_page(offset + filsz))) != 0)
145 return error;
146
147 error = copyout(data_buf, (caddr_t) map_addr, copy_len);
148
149 kmem_free_wakeup(exec_map, (vm_offset_t)data_buf, PAGE_SIZE);
150
151 return error;
152 }
153
154 static int
155 coff_load_file(struct thread *td, char *name)
156 {
157 struct proc *p = td->td_proc;
158 struct vmspace *vmspace = p->p_vmspace;
159 int error;
160 struct nameidata nd;
161 struct vnode *vp;
162 struct vattr attr;
163 struct filehdr *fhdr;
164 struct aouthdr *ahdr;
165 struct scnhdr *scns;
166 char *ptr = 0;
167 int nscns;
168 unsigned long text_offset = 0, text_address = 0, text_size = 0;
169 unsigned long data_offset = 0, data_address = 0, data_size = 0;
170 unsigned long bss_size = 0;
171 int i;
172
173 NDINIT(&nd, LOOKUP, ISOPEN | LOCKLEAF | FOLLOW | SAVENAME,
174 UIO_SYSSPACE, name, td);
175
176 error = namei(&nd);
177 if (error)
178 return error;
179
180 vp = nd.ni_vp;
181 if (vp == NULL)
182 return ENOEXEC;
183
184 if (vp->v_writecount) {
185 error = ETXTBSY;
186 goto fail;
187 }
188
189 if ((error = VOP_GETATTR(vp, &attr, td->td_ucred)) != 0)
190 goto fail;
191
192 if ((vp->v_mount->mnt_flag & MNT_NOEXEC)
193 || ((attr.va_mode & 0111) == 0)
194 || (attr.va_type != VREG))
195 goto fail;
196
197 if (attr.va_size == 0) {
198 error = ENOEXEC;
199 goto fail;
200 }
201
202 if ((error = VOP_ACCESS(vp, VEXEC, td->td_ucred, td)) != 0)
203 goto fail;
204
205 if ((error = VOP_OPEN(vp, FREAD, td->td_ucred, td, NULL)) != 0)
206 goto fail;
207
208 /*
209 * Lose the lock on the vnode. It's no longer needed, and must not
210 * exist for the pagefault paging to work below.
211 */
212 VOP_UNLOCK(vp, 0);
213
214 if ((error = vm_mmap(exec_map,
215 (vm_offset_t *) &ptr,
216 PAGE_SIZE,
217 VM_PROT_READ,
218 VM_PROT_READ,
219 0,
220 OBJT_VNODE,
221 vp,
222 0)) != 0)
223 goto unlocked_fail;
224
225 fhdr = (struct filehdr *)ptr;
226
227 if (fhdr->f_magic != I386_COFF) {
228 error = ENOEXEC;
229 goto dealloc_and_fail;
230 }
231
232 nscns = fhdr->f_nscns;
233
234 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
235 /*
236 * XXX -- just fail. I'm so lazy.
237 */
238 error = ENOEXEC;
239 goto dealloc_and_fail;
240 }
241
242 ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr));
243
244 scns = (struct scnhdr*)(ptr + sizeof(struct filehdr)
245 + sizeof(struct aouthdr));
246
247 for (i = 0; i < nscns; i++) {
248 if (scns[i].s_flags & STYP_NOLOAD)
249 continue;
250 else if (scns[i].s_flags & STYP_TEXT) {
251 text_address = scns[i].s_vaddr;
252 text_size = scns[i].s_size;
253 text_offset = scns[i].s_scnptr;
254 }
255 else if (scns[i].s_flags & STYP_DATA) {
256 data_address = scns[i].s_vaddr;
257 data_size = scns[i].s_size;
258 data_offset = scns[i].s_scnptr;
259 } else if (scns[i].s_flags & STYP_BSS) {
260 bss_size = scns[i].s_size;
261 }
262 }
263
264 if ((error = load_coff_section(vmspace, vp, text_offset,
265 (caddr_t)(void *)(uintptr_t)text_address,
266 text_size, text_size,
267 VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
268 goto dealloc_and_fail;
269 }
270 if ((error = load_coff_section(vmspace, vp, data_offset,
271 (caddr_t)(void *)(uintptr_t)data_address,
272 data_size + bss_size, data_size,
273 VM_PROT_ALL)) != 0) {
274 goto dealloc_and_fail;
275 }
276
277 error = 0;
278
279 dealloc_and_fail:
280 kmem_free_wakeup(exec_map, (vm_offset_t)ptr, PAGE_SIZE);
281 fail:
282 VOP_UNLOCK(vp, 0);
283 unlocked_fail:
284 NDFREE(&nd, NDF_ONLY_PNBUF);
285 vrele(nd.ni_vp);
286 return error;
287 }
288
289 static int
290 exec_coff_imgact(imgp)
291 struct image_params *imgp;
292 {
293 const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header;
294 const struct aouthdr *ahdr;
295 const struct scnhdr *scns;
296 int i;
297 struct vmspace *vmspace;
298 int nscns;
299 int error;
300 unsigned long text_offset = 0, text_address = 0, text_size = 0;
301 unsigned long data_offset = 0, data_address = 0, data_size = 0;
302 unsigned long bss_size = 0;
303 vm_offset_t hole;
304
305 if (fhdr->f_magic != I386_COFF ||
306 !(fhdr->f_flags & F_EXEC)) {
307
308 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
309 return -1;
310 }
311
312 nscns = fhdr->f_nscns;
313 if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
314 /*
315 * For now, return an error -- need to be able to
316 * read in all of the section structures.
317 */
318
319 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
320 return -1;
321 }
322
323 ahdr = (const struct aouthdr*)
324 ((const char*)(imgp->image_header) + sizeof(struct filehdr));
325 imgp->entry_addr = ahdr->entry;
326
327 scns = (const struct scnhdr*)
328 ((const char*)(imgp->image_header) + sizeof(struct filehdr) +
329 sizeof(struct aouthdr));
330
331 VOP_UNLOCK(imgp->vp, 0);
332
333 error = exec_new_vmspace(imgp, &ibcs2_svr3_sysvec);
334 if (error)
335 goto fail;
336 vmspace = imgp->proc->p_vmspace;
337
338 for (i = 0; i < nscns; i++) {
339
340 DPRINTF(("i = %d, s_name = %s, s_vaddr = %08lx, "
341 "s_scnptr = %ld s_size = %lx\n", i, scns[i].s_name,
342 scns[i].s_vaddr, scns[i].s_scnptr, scns[i].s_size));
343 if (scns[i].s_flags & STYP_NOLOAD) {
344 /*
345 * A section that is not loaded, for whatever
346 * reason. It takes precedance over other flag
347 * bits...
348 */
349 continue;
350 } else if (scns[i].s_flags & STYP_TEXT) {
351 text_address = scns[i].s_vaddr;
352 text_size = scns[i].s_size;
353 text_offset = scns[i].s_scnptr;
354 } else if (scns[i].s_flags & STYP_DATA) {
355 /* .data section */
356 data_address = scns[i].s_vaddr;
357 data_size = scns[i].s_size;
358 data_offset = scns[i].s_scnptr;
359 } else if (scns[i].s_flags & STYP_BSS) {
360 /* .bss section */
361 bss_size = scns[i].s_size;
362 } else if (scns[i].s_flags & STYP_LIB) {
363 char *buf = 0;
364 int foff = trunc_page(scns[i].s_scnptr);
365 int off = scns[i].s_scnptr - foff;
366 int len = round_page(scns[i].s_size + PAGE_SIZE);
367 int j;
368
369 if ((error = vm_mmap(exec_map,
370 (vm_offset_t *) &buf,
371 len,
372 VM_PROT_READ,
373 VM_PROT_READ,
374 MAP_SHARED,
375 OBJT_VNODE,
376 imgp->vp,
377 foff)) != 0) {
378 error = ENOEXEC;
379 goto fail;
380 }
381 if(scns[i].s_size) {
382 char *libbuf;
383 int emul_path_len = strlen(ibcs2_emul_path);
384
385 libbuf = malloc(MAXPATHLEN + emul_path_len,
386 M_TEMP, M_WAITOK);
387 strcpy(libbuf, ibcs2_emul_path);
388
389 for (j = off; j < scns[i].s_size + off;) {
390 long stroff, nextoff;
391 char *libname;
392
393 nextoff = 4 * *(long *)(buf + j);
394 stroff = 4 * *(long *)(buf + j + sizeof(long));
395
396 libname = buf + j + stroff;
397 j += nextoff;
398
399 DPRINTF(("%s(%d): shared library %s\n",
400 __FILE__, __LINE__, libname));
401 strlcpy(&libbuf[emul_path_len], libname, MAXPATHLEN);
402 error = coff_load_file(
403 FIRST_THREAD_IN_PROC(imgp->proc), libbuf);
404 if (error)
405 error = coff_load_file(
406 FIRST_THREAD_IN_PROC(imgp->proc),
407 libname);
408 if (error) {
409 printf(
410 "error %d loading coff shared library %s\n",
411 error, libname);
412 break;
413 }
414 }
415 free(libbuf, M_TEMP);
416 }
417 kmem_free_wakeup(exec_map, (vm_offset_t)buf, len);
418 if (error)
419 goto fail;
420 }
421 }
422 /*
423 * Map in .text now
424 */
425
426 DPRINTF(("%s(%d): load_coff_section(vmspace, "
427 "imgp->vp, %08lx, %08lx, 0x%lx, 0x%lx, 0x%x)\n",
428 __FILE__, __LINE__, text_offset, text_address,
429 text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE));
430 if ((error = load_coff_section(vmspace, imgp->vp,
431 text_offset,
432 (caddr_t)(void *)(uintptr_t)text_address,
433 text_size, text_size,
434 VM_PROT_READ | VM_PROT_EXECUTE)) != 0) {
435 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
436 goto fail;
437 }
438 /*
439 * Map in .data and .bss now
440 */
441
442
443 DPRINTF(("%s(%d): load_coff_section(vmspace, "
444 "imgp->vp, 0x%08lx, 0x%08lx, 0x%lx, 0x%lx, 0x%x)\n",
445 __FILE__, __LINE__, data_offset, data_address,
446 data_size + bss_size, data_size, VM_PROT_ALL));
447 if ((error = load_coff_section(vmspace, imgp->vp,
448 data_offset,
449 (caddr_t)(void *)(uintptr_t)data_address,
450 data_size + bss_size, data_size,
451 VM_PROT_ALL)) != 0) {
452
453 DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
454 goto fail;
455 }
456
457 imgp->interpreted = 0;
458 imgp->proc->p_sysent = &ibcs2_svr3_sysvec;
459
460 vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
461 vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
462 vmspace->vm_taddr = (caddr_t)(void *)(uintptr_t)text_address;
463 vmspace->vm_daddr = (caddr_t)(void *)(uintptr_t)data_address;
464
465 hole = trunc_page((vm_offset_t)vmspace->vm_daddr +
466 ctob(vmspace->vm_dsize));
467
468 DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%jx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n",
469 __FILE__, __LINE__, (uintmax_t)hole));
470 DPRINTF(("imgact: error = %d\n", error));
471
472 vm_map_find(&vmspace->vm_map, NULL, 0,
473 (vm_offset_t *)&hole, PAGE_SIZE, VMFS_NO_SPACE,
474 VM_PROT_ALL, VM_PROT_ALL, 0);
475 DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%p end = 0x%p\n",
476 ctob(vmspace->vm_dsize), vmspace->vm_daddr,
477 ctob(vmspace->vm_dsize) + vmspace->vm_daddr ));
478 DPRINTF(("%s(%d): returning %d!\n", __FILE__, __LINE__, error));
479
480 fail:
481 vn_lock(imgp->vp, LK_EXCLUSIVE | LK_RETRY);
482
483 return (error);
484 }
485
486 /*
487 * Tell kern_execve.c about it, with a little help from the linker.
488 */
489 static struct execsw coff_execsw = { exec_coff_imgact, "coff" };
490 EXEC_SET(coff, coff_execsw);
Cache object: 31f114144629fd7e5a47adab3346eea3
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