imgact_coff.c revision 28751
1/*-
2 * Copyright (c) 1994 Sean Eric Fagan
3 * Copyright (c) 1994 S�ren 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 withough 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 *	$Id: imgact_coff.c,v 1.25 1997/07/20 09:39:51 bde Exp $
30 */
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/mman.h>
35#include <sys/imgact.h>
36#include <sys/kernel.h>
37#include <sys/fcntl.h>
38#include <sys/malloc.h>
39#include <sys/mount.h>
40#include <sys/namei.h>
41#include <sys/vnode.h>
42
43#include <vm/vm.h>
44#include <vm/vm_prot.h>
45#include <vm/pmap.h>
46#include <vm/vm_map.h>
47#include <vm/vm_kern.h>
48#include <vm/vm_extern.h>
49
50#include <i386/ibcs2/coff.h>
51#include <i386/ibcs2/ibcs2_util.h>
52
53extern struct sysentvec ibcs2_svr3_sysvec;
54
55extern int coff_load_file __P((struct proc *p, char *name));
56extern int exec_coff_imgact __P((struct image_params *imgp));
57
58static int load_coff_section __P((struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset, caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot));
59
60static int
61load_coff_section(struct vmspace *vmspace, struct vnode *vp, vm_offset_t offset,
62		  caddr_t vmaddr, size_t memsz, size_t filsz, vm_prot_t prot)
63{
64	size_t map_len;
65	vm_offset_t map_offset;
66	vm_offset_t map_addr;
67	int error;
68	unsigned char *data_buf = 0;
69	size_t copy_len;
70
71	map_offset = trunc_page(offset);
72	map_addr = trunc_page(vmaddr);
73
74	if (memsz > filsz) {
75		/*
76		 * We have the stupid situation that
77		 * the section is longer than it is on file,
78		 * which means it has zero-filled areas, and
79		 * we have to work for it.  Stupid iBCS!
80		 */
81		map_len = trunc_page(offset + filsz) - trunc_page(map_offset);
82	} else {
83		/*
84		 * The only stuff we care about is on disk, and we
85		 * don't care if we map in more than is really there.
86		 */
87		map_len = round_page(offset + filsz) - trunc_page(map_offset);
88	}
89
90	DPRINTF(("%s(%d):  vm_mmap(&vmspace->vm_map, &0x%08lx, 0x%x, 0x%x, "
91		"VM_PROT_ALL, MAP_PRIVATE | MAP_FIXED, vp, 0x%x)\n",
92		__FILE__, __LINE__, map_addr, map_len, prot, map_offset));
93
94	if (error = vm_mmap(&vmspace->vm_map,
95			     &map_addr,
96			     map_len,
97			     prot,
98			     VM_PROT_ALL,
99			     MAP_PRIVATE | MAP_FIXED,
100			     (caddr_t) vp,
101			     map_offset))
102		return error;
103
104	if (memsz == filsz) {
105		/* We're done! */
106		return 0;
107	}
108
109	/*
110	 * Now we have screwball stuff, to accomodate stupid COFF.
111	 * We have to map the remaining bit of the file into the kernel's
112	 * memory map, allocate some anonymous memory, copy that last
113	 * bit into it, and then we're done. *sigh*
114	 * For clean-up reasons, we actally map in the file last.
115	 */
116
117	copy_len = (offset + filsz) - trunc_page(offset + filsz);
118	map_addr = trunc_page(vmaddr + filsz);
119	map_len = round_page(vmaddr + memsz) - map_addr;
120
121	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));
122
123	if (map_len != 0) {
124		error = vm_map_find(&vmspace->vm_map, NULL, 0, &map_addr,
125				    map_len, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0);
126		if (error)
127			return error;
128	}
129
130	if (error = vm_mmap(kernel_map,
131			    (vm_offset_t *) &data_buf,
132			    PAGE_SIZE,
133			    VM_PROT_READ,
134			    VM_PROT_READ,
135			    0,
136			    (caddr_t) vp,
137			    trunc_page(offset + filsz)))
138		return error;
139
140	error = copyout(data_buf, (caddr_t) map_addr, copy_len);
141
142	if (vm_map_remove(kernel_map,
143			  (vm_offset_t) data_buf,
144			  (vm_offset_t) data_buf + PAGE_SIZE))
145		panic("load_coff_section vm_map_remove failed");
146
147	return error;
148}
149
150int
151coff_load_file(struct proc *p, char *name)
152{
153  	struct vmspace *vmspace = p->p_vmspace;
154  	int error;
155  	struct nameidata nd;
156  	struct vnode *vp;
157  	struct vattr attr;
158  	struct filehdr *fhdr;
159  	struct aouthdr *ahdr;
160  	struct scnhdr *scns;
161  	char *ptr = 0;
162  	int nscns;
163  	unsigned long text_offset = 0, text_address = 0, text_size = 0;
164  	unsigned long data_offset = 0, data_address = 0, data_size = 0;
165  	unsigned long bss_size = 0;
166  	int i;
167
168	/* XXX use of 'curproc' should be 'p'?*/
169	NDINIT(&nd, LOOKUP, LOCKLEAF | FOLLOW | SAVENAME, UIO_SYSSPACE, name, curproc);
170
171  	error = namei(&nd);
172  	if (error)
173    		return error;
174
175  	vp = nd.ni_vp;
176  	if (vp == NULL)
177    		return ENOEXEC;
178
179  	if (vp->v_writecount) {
180    		error = ETXTBSY;
181    		goto fail;
182  	}
183
184  	if (error = VOP_GETATTR(vp, &attr, p->p_ucred, p))
185    		goto fail;
186
187  	if ((vp->v_mount->mnt_flag & MNT_NOEXEC)
188	    || ((attr.va_mode & 0111) == 0)
189	    || (attr.va_type != VREG))
190    		goto fail;
191
192  	if (attr.va_size == 0) {
193    		error = ENOEXEC;
194    		goto fail;
195  	}
196
197  	if (error = VOP_ACCESS(vp, VEXEC, p->p_ucred, p))
198    		goto fail;
199
200  	if (error = VOP_OPEN(vp, FREAD, p->p_ucred, p))
201    		goto fail;
202
203	/*
204	 * Lose the lock on the vnode. It's no longer needed, and must not
205	 * exist for the pagefault paging to work below.
206	 */
207	VOP_UNLOCK(vp, 0, p);
208
209  	if (error = vm_mmap(kernel_map,
210			    (vm_offset_t *) &ptr,
211			    PAGE_SIZE,
212			    VM_PROT_READ,
213		       	    VM_PROT_READ,
214			    0,
215			    (caddr_t) vp,
216			    0))
217    	goto fail;
218
219  	fhdr = (struct filehdr *)ptr;
220
221  	if (fhdr->f_magic != I386_COFF) {
222    		error = ENOEXEC;
223    		goto dealloc_and_fail;
224  	}
225
226  	nscns = fhdr->f_nscns;
227
228  	if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
229    		/*
230     		 * XXX -- just fail.  I'm so lazy.
231     		 */
232    		error = ENOEXEC;
233    		goto dealloc_and_fail;
234  	}
235
236  	ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr));
237
238  	scns = (struct scnhdr*)(ptr + sizeof(struct filehdr)
239			  + sizeof(struct aouthdr));
240
241  	for (i = 0; i < nscns; i++) {
242    		if (scns[i].s_flags & STYP_NOLOAD)
243      			continue;
244    		else if (scns[i].s_flags & STYP_TEXT) {
245      			text_address = scns[i].s_vaddr;
246      			text_size = scns[i].s_size;
247      			text_offset = scns[i].s_scnptr;
248    		}
249		else if (scns[i].s_flags & STYP_DATA) {
250      			data_address = scns[i].s_vaddr;
251      			data_size = scns[i].s_size;
252      			data_offset = scns[i].s_scnptr;
253    		} else if (scns[i].s_flags & STYP_BSS) {
254      			bss_size = scns[i].s_size;
255    		}
256  	}
257
258  	if (error = load_coff_section(vmspace, vp, text_offset,
259				      (caddr_t)text_address,
260				      text_size, text_size,
261				      VM_PROT_READ | VM_PROT_EXECUTE)) {
262    		goto dealloc_and_fail;
263  	}
264  	if (error = load_coff_section(vmspace, vp, data_offset,
265				      (caddr_t)data_address,
266				      data_size + bss_size, data_size,
267				      VM_PROT_ALL)) {
268    		goto dealloc_and_fail;
269  	}
270
271  	error = 0;
272
273 	dealloc_and_fail:
274	if (vm_map_remove(kernel_map,
275			  (vm_offset_t) ptr,
276			  (vm_offset_t) ptr + PAGE_SIZE))
277    		panic(__FUNCTION__ " vm_map_remove failed");
278
279 fail:
280  	vput(nd.ni_vp);
281  	FREE(nd.ni_cnd.cn_pnbuf, M_NAMEI);
282  	return error;
283}
284
285int
286exec_coff_imgact(imgp)
287	struct image_params *imgp;
288{
289	const struct filehdr *fhdr = (const struct filehdr*)imgp->image_header;
290	const struct aouthdr *ahdr;
291	const struct scnhdr *scns;
292	int i;
293	struct vmspace *vmspace;
294	int nscns;
295	int error;
296	unsigned long text_offset = 0, text_address = 0, text_size = 0;
297	unsigned long data_offset = 0, data_address = 0, data_size = 0;
298	unsigned long bss_size = 0;
299	caddr_t hole;
300
301	if (fhdr->f_magic != I386_COFF ||
302	    !(fhdr->f_flags & F_EXEC)) {
303
304		 DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
305		 return -1;
306	}
307
308	nscns = fhdr->f_nscns;
309	if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
310	  	/*
311	   	 * For now, return an error -- need to be able to
312	   	 * read in all of the section structures.
313	   	 */
314
315		DPRINTF(("%s(%d): return -1\n", __FILE__, __LINE__));
316		return -1;
317	}
318
319	ahdr = (const struct aouthdr*)
320	       ((const char*)(imgp->image_header) + sizeof(struct filehdr));
321	imgp->entry_addr = ahdr->entry;
322
323	scns = (const struct scnhdr*)
324	       ((const char*)(imgp->image_header) + sizeof(struct filehdr) +
325		sizeof(struct aouthdr));
326
327	if (error = exec_extract_strings(imgp)) {
328		DPRINTF(("%s(%d):  return %d\n", __FILE__, __LINE__, error));
329		return error;
330	}
331
332	exec_new_vmspace(imgp);
333	vmspace = imgp->proc->p_vmspace;
334
335	for (i = 0; i < nscns; i++) {
336
337	  DPRINTF(("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, "
338		   "scns[i].s_scnptr = %d\n", i, scns[i].s_name,
339		   scns[i].s_vaddr, scns[i].s_scnptr));
340	  if (scns[i].s_flags & STYP_NOLOAD) {
341	    	/*
342	     	 * A section that is not loaded, for whatever
343	     	 * reason.  It takes precedance over other flag
344	     	 * bits...
345	     	 */
346	    	continue;
347	  } else if (scns[i].s_flags & STYP_TEXT) {
348	    	text_address = scns[i].s_vaddr;
349	    	text_size = scns[i].s_size;
350	    	text_offset = scns[i].s_scnptr;
351	  } else if (scns[i].s_flags & STYP_DATA) {
352	    	/* .data section */
353	    	data_address = scns[i].s_vaddr;
354	    	data_size = scns[i].s_size;
355	    	data_offset = scns[i].s_scnptr;
356	  } else if (scns[i].s_flags & STYP_BSS) {
357	    	/* .bss section */
358	    	bss_size = scns[i].s_size;
359	  } else if (scns[i].s_flags & STYP_LIB) {
360	    	char *buf = 0;
361	    	int foff = trunc_page(scns[i].s_scnptr);
362	    	int off = scns[i].s_scnptr - foff;
363	    	int len = round_page(scns[i].s_size + PAGE_SIZE);
364	    	int j;
365
366	    	if (error = vm_mmap(kernel_map,
367				    (vm_offset_t *) &buf,
368				    len,
369				    VM_PROT_READ,
370				    VM_PROT_READ,
371				    0,
372				    (caddr_t) imgp->vp,
373				    foff)) {
374	      		return ENOEXEC;
375	    	}
376		if(scns[i].s_size) {
377			char *libbuf;
378			int emul_path_len = strlen(ibcs2_emul_path);
379
380			libbuf = malloc(MAXPATHLEN + emul_path_len,
381					M_TEMP, M_WAITOK);
382			strcpy(libbuf, ibcs2_emul_path);
383
384		    	for (j = off; j < scns[i].s_size + off; j++) {
385	      			char *libname;
386
387		      		libname = buf + j + 4 * *(long*)(buf + j + 4);
388		      		j += 4* *(long*)(buf + j);
389
390				DPRINTF(("%s(%d):  shared library %s\n",
391					 __FILE__, __LINE__, libname));
392				strcpy(&libbuf[emul_path_len], libname);
393		      		error = coff_load_file(imgp->proc, libbuf);
394		      		if (error)
395	      				error = coff_load_file(imgp->proc,
396							       libname);
397		      		if (error)
398					break;
399		    	}
400			free(libbuf, M_TEMP);
401		}
402		if (vm_map_remove(kernel_map,
403				  (vm_offset_t) buf,
404				  (vm_offset_t) buf + len))
405	      		panic("exec_coff_imgact vm_map_remove failed");
406	    	if (error)
407	      		return error;
408	  	}
409	}
410	/*
411	 * Map in .text now
412	 */
413
414	DPRINTF(("%s(%d):  load_coff_section(vmspace, "
415		"imgp->vp, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n",
416		__FILE__, __LINE__, text_offset, text_address,
417		text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE));
418	if (error = load_coff_section(vmspace, imgp->vp,
419				      text_offset, (caddr_t)text_address,
420				      text_size, text_size,
421				      VM_PROT_READ | VM_PROT_EXECUTE)) {
422		DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
423		return error;
424       	}
425	/*
426	 * Map in .data and .bss now
427	 */
428
429
430	DPRINTF(("%s(%d): load_coff_section(vmspace, "
431		"imgp->vp, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n",
432		__FILE__, __LINE__, data_offset, data_address,
433		data_size + bss_size, data_size, VM_PROT_ALL));
434	if (error = load_coff_section(vmspace, imgp->vp,
435				      data_offset, (caddr_t)data_address,
436				      data_size + bss_size, data_size,
437				      VM_PROT_ALL)) {
438
439		DPRINTF(("%s(%d): error = %d\n", __FILE__, __LINE__, error));
440		return error;
441	}
442
443	imgp->interpreted = 0;
444	imgp->proc->p_sysent = &ibcs2_svr3_sysvec;
445
446	vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
447	vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
448	vmspace->vm_taddr = (caddr_t)text_address;
449	vmspace->vm_daddr = (caddr_t)data_address;
450
451	hole = (caddr_t)trunc_page(vmspace->vm_daddr) + ctob(vmspace->vm_dsize);
452
453
454	DPRINTF(("%s(%d): vm_map_find(&vmspace->vm_map, NULL, 0, &0x%08lx, PAGE_SIZE, FALSE, VM_PROT_ALL, VM_PROT_ALL, 0)\n",
455		__FILE__, __LINE__, hole));
456        DPRINTF(("imgact: error = %d\n", error));
457
458	error = vm_map_find(&vmspace->vm_map, NULL, 0,
459			    (vm_offset_t *) &hole, PAGE_SIZE, FALSE,
460				VM_PROT_ALL, VM_PROT_ALL, 0);
461
462	DPRINTF(("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n",
463		ctob(vmspace->vm_dsize), vmspace->vm_daddr,
464		ctob(vmspace->vm_dsize) + vmspace->vm_daddr ));
465	DPRINTF(("%s(%d):  returning successfully!\n", __FILE__, __LINE__));
466
467	/* Indicate that this file should not be modified */
468	imgp->vp->v_flag |= VTEXT;
469	return 0;
470}
471
472/*
473 * Tell kern_execve.c about it, with a little help from the linker.
474 * Since `const' objects end up in the text segment, TEXT_SET is the
475 * correct directive to use.
476 */
477const struct execsw coff_execsw = { exec_coff_imgact, "coff" };
478TEXT_SET(execsw_set, coff_execsw);
479