imgact_coff.c revision 3584 
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 1.11 1994/10/12 19:38:03 sos Exp $
30 */
31
32#include <sys/param.h>
33#include <sys/systm.h>
34#include <sys/resourcevar.h>
35#include <sys/exec.h>
36#include <sys/mman.h>
37#include <sys/imgact.h>
38#include <sys/kernel.h>
39#include <sys/file.h>
40#include <sys/malloc.h>
41#include <sys/mount.h>
42#include <sys/sysent.h>
43#include <vm/vm.h>
44#include <vm/vm_kern.h>
45#include "coff.h"
46#include "ibcs2.h"
47
48static int
49load_coff_section(vmspace, vp, offset, vmaddr, memsz, filsz, prot)
50	struct vmspace *vmspace;
51	struct vnode *vp;
52	vm_offset_t offset;
53	caddr_t vmaddr;
54	size_t memsz, filsz;
55	vm_prot_t prot;
56{
57	size_t map_len;
58	vm_offset_t map_offset;
59	caddr_t map_addr;
60	int error;
61	unsigned char *data_buf = 0;
62	size_t copy_len;
63
64	map_offset = trunc_page(offset);
65	map_addr = (caddr_t)trunc_page(vmaddr);
66
67	if (memsz > filsz) {
68		/*
69		 * We have the stupid situation that
70		 * the section is longer than it is on file,
71		 * which means it has zero-filled areas, and
72		 * we have to work for it.  Stupid iBCS!
73		 */
74		map_len = trunc_page(offset + filsz) - trunc_page(map_offset);
75	} else {
76		/*
77		 * The only stuff we care about is on disk, and we
78		 * don't care if we map in more than is really there.
79		 */
80		map_len = round_page(offset + filsz) - trunc_page(map_offset);
81	}
82
83if (ibcs2_trace & IBCS2_TRACE_COFF) {
84printf("%s(%d):  vm_mmap(&vmspace->vm_map, &0x%08lx, 0x%x, 0x%x, "
85	"VM_PROT_ALL, MAP_FILE | MAP_PRIVATE | MAP_FIXED, vp, 0x%x)\n",
86	__FILE__, __LINE__, map_addr, map_len, prot, map_offset);
87}
88
89	if (error = vm_mmap(&vmspace->vm_map,
90			     &map_addr,
91			     map_len,
92			     prot,
93			     VM_PROT_ALL,
94			     MAP_FILE | MAP_PRIVATE | MAP_FIXED,
95			     vp,
96			     map_offset))
97		return error;
98
99	if (memsz == filsz) {
100		/* We're done! */
101		return 0;
102	}
103
104	/*
105	 * Now we have screwball stuff, to accomodate stupid COFF.
106	 * We have to map the remaining bit of the file into the kernel's
107	 * memory map, allocate some anonymous memory, copy that last
108	 * bit into it, and then we're done. *sigh*
109	 * For clean-up reasons, we actally map in the file last.
110	 */
111
112	copy_len = (offset + filsz) - trunc_page(offset + filsz);
113	map_addr = (caddr_t)trunc_page(vmaddr + filsz);
114	map_len = round_page(memsz) - trunc_page(filsz);
115
116if (ibcs2_trace & IBCS2_TRACE_COFF) {
117printf("%s(%d): vm_allocate(&vmspace->vm_map, &0x%08lx, 0x%x, FALSE)\n",
118	__FILE__, __LINE__, map_addr, map_len);
119}
120
121	if (error = vm_allocate(&vmspace->vm_map, &map_addr, map_len, FALSE))
122		return error;
123
124	if (error = vm_mmap(kernel_map, &data_buf, PAGE_SIZE,
125			     VM_PROT_READ, VM_PROT_READ, MAP_FILE,
126			     vp, trunc_page(offset + filsz)))
127		return error;
128
129	bcopy(data_buf, map_addr, copy_len);
130
131	if (vm_deallocate(kernel_map, data_buf, PAGE_SIZE))
132		panic("load_coff_section vm_deallocate failed");
133
134	return 0;
135}
136
137int
138coff_load_file(struct proc *p, char *name)
139{
140  	struct vmspace *vmspace = p->p_vmspace;
141  	int error;
142  	struct nameidata nd;
143  	struct vnode *vnodep;
144  	struct vattr attr;
145  	struct filehdr *fhdr;
146  	struct aouthdr *ahdr;
147  	struct scnhdr *scns;
148  	char *ptr = 0;
149  	int nscns;
150  	unsigned long text_offset = 0, text_address = 0, text_size = 0;
151  	unsigned long data_offset = 0, data_address = 0, data_size = 0;
152  	unsigned long bss_size = 0;
153  	int i;
154
155  	nd.ni_cnd.cn_nameiop = LOOKUP;
156	nd.ni_cnd.cn_flags = LOCKLEAF | FOLLOW | SAVENAME;
157	nd.ni_cnd.cn_proc = curproc;
158	nd.ni_cnd.cn_cred = curproc->p_cred->pc_ucred;
159  	nd.ni_segflg = UIO_SYSSPACE;
160  	nd.ni_dirp = name;
161
162  	error = namei(&nd);
163  	if (error)
164    		return error;
165
166  	vnodep = nd.ni_vp;
167  	if (vnodep == NULL)
168    		return ENOEXEC;
169
170  	if (vnodep->v_writecount) {
171    		error = ETXTBSY;
172    		goto fail;
173  	}
174
175  	if (error = VOP_GETATTR(vnodep, &attr, p->p_ucred, p))
176    		goto fail;
177
178  	if ((vnodep->v_mount->mnt_flag & MNT_NOEXEC)
179	    || ((attr.va_mode & 0111) == 0)
180	    || (attr.va_type != VREG))
181    		goto fail;
182
183  	if (attr.va_size == 0) {
184    		error = ENOEXEC;
185    		goto fail;
186  	}
187
188  	if (error = VOP_ACCESS(vnodep, VEXEC, p->p_ucred, p))
189    		goto fail;
190
191  	if (error = VOP_OPEN(vnodep, FREAD, p->p_ucred, p))
192    		goto fail;
193
194  	if (error = vm_mmap(kernel_map, &ptr, PAGE_SIZE, VM_PROT_READ,
195		       	    VM_PROT_READ, MAP_FILE, vnodep, 0))
196    	goto fail;
197
198  	fhdr = (struct filehdr *)ptr;
199
200  	if (fhdr->f_magic != I386_COFF) {
201    		error = ENOEXEC;
202    		goto dealloc_and_fail;
203  	}
204
205  	nscns = fhdr->f_nscns;
206
207  	if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
208    		/*
209     		 * XXX -- just fail.  I'm so lazy.
210     		 */
211    		error = ENOEXEC;
212    		goto dealloc_and_fail;
213  	}
214
215  	ahdr = (struct aouthdr*)(ptr + sizeof(struct filehdr));
216
217  	scns = (struct scnhdr*)(ptr + sizeof(struct filehdr)
218			  + sizeof(struct aouthdr));
219
220  	for (i = 0; i < nscns; i++) {
221    		if (scns[i].s_flags & STYP_NOLOAD)
222      			continue;
223    		else if (scns[i].s_flags & STYP_TEXT) {
224      			text_address = scns[i].s_vaddr;
225      			text_size = scns[i].s_size;
226      			text_offset = scns[i].s_scnptr;
227    		}
228		else if (scns[i].s_flags & STYP_DATA) {
229      			data_address = scns[i].s_vaddr;
230      			data_size = scns[i].s_size;
231      			data_offset = scns[i].s_scnptr;
232    		} else if (scns[i].s_flags & STYP_BSS) {
233      			bss_size = scns[i].s_size;
234    		}
235  	}
236
237  	if (error = load_coff_section(vmspace, vnodep, text_offset,
238				      (caddr_t)text_address,
239				      text_size, text_size,
240				      VM_PROT_READ | VM_PROT_EXECUTE)) {
241    		goto dealloc_and_fail;
242  	}
243  	if (error = load_coff_section(vmspace, vnodep, data_offset,
244				      (caddr_t)data_address,
245				      data_size + bss_size, data_size,
246				      VM_PROT_ALL)) {
247    		goto dealloc_and_fail;
248  	}
249
250  	error = 0;
251
252 	dealloc_and_fail:
253  	if (vm_deallocate(kernel_map, ptr, PAGE_SIZE))
254    		panic(__FUNCTION__ " vm_deallocate failed");
255
256 fail:
257  	vput(nd.ni_vp);
258  	FREE(nd.ni_cnd.cn_pnbuf, M_NAMEI);
259  	return error;
260}
261
262int
263exec_coff_imgact(iparams)
264	struct image_params *iparams;
265{
266	struct filehdr *fhdr = (struct filehdr*)iparams->image_header;
267	struct aouthdr *ahdr;
268	struct scnhdr *scns;
269	int i;
270	struct vmspace *vmspace = iparams->proc->p_vmspace;
271	unsigned long vmaddr;
272	int nscns;
273	int error, len;
274	extern struct sysentvec ibcs2_svr3_sysvec;
275	unsigned long text_offset = 0, text_address = 0, text_size = 0;
276	unsigned long data_offset = 0, data_address = 0, data_size = 0;
277	unsigned long bss_size = 0;
278	int need_hack_p;
279	unsigned long data_end;
280	unsigned long data_map_start, data_map_len, data_map_addr = 0;
281	unsigned long bss_address, bss_map_start, data_copy_len, bss_map_len;
282	unsigned char *data_buf = 0;
283	caddr_t hole;
284
285	if (fhdr->f_magic != I386_COFF ||
286	    !(fhdr->f_flags & F_EXEC)) {
287
288if (ibcs2_trace & IBCS2_TRACE_COFF) {
289printf("%s(%d): return -1\n", __FILE__, __LINE__);
290}
291
292	  	return -1;
293	}
294
295	nscns = fhdr->f_nscns;
296	if ((nscns * sizeof(struct scnhdr)) > PAGE_SIZE) {
297	  	/*
298	   	 * For now, return an error -- need to be able to
299	   	 * read in all of the section structures.
300	   	 */
301
302if (ibcs2_trace & IBCS2_TRACE_COFF) {
303printf("%s(%d): return -1\n", __FILE__, __LINE__);
304}
305	  	return -1;
306	}
307
308	ahdr = (struct aouthdr*)((char*)(iparams->image_header) +
309				 sizeof(struct filehdr));
310	iparams->entry_addr = ahdr->entry;
311
312	scns = (struct scnhdr*)((char*)(iparams->image_header) +
313				sizeof(struct filehdr) +
314				sizeof(struct aouthdr));
315
316	if (error = exec_extract_strings(iparams)) {
317
318if (ibcs2_trace & IBCS2_TRACE_COFF) {
319printf("%s(%d):  return %d\n", __FILE__, __LINE__, error);
320}
321	  	return error;
322	}
323
324	exec_new_vmspace(iparams);
325
326	for (i = 0; i < nscns; i++) {
327
328if (ibcs2_trace & IBCS2_TRACE_COFF) {
329printf("i = %d, scns[i].s_name = %s, scns[i].s_vaddr = %08lx, "
330       "scns[i].s_scnptr = %d\n", i, scns[i].s_name,
331       scns[i].s_vaddr, scns[i].s_scnptr);
332}
333	  if (scns[i].s_flags & STYP_NOLOAD) {
334	    	/*
335	     	 * A section that is not loaded, for whatever
336	     	 * reason.  It takes precedance over other flag
337	     	 * bits...
338	     	 */
339	    	continue;
340	  } else if (scns[i].s_flags & STYP_TEXT) {
341	    	text_address = scns[i].s_vaddr;
342	    	text_size = scns[i].s_size;
343	    	text_offset = scns[i].s_scnptr;
344	  } else if (scns[i].s_flags & STYP_DATA) {
345	    	/* .data section */
346	    	data_address = scns[i].s_vaddr;
347	    	data_size = scns[i].s_size;
348	    	data_offset = scns[i].s_scnptr;
349	  } else if (scns[i].s_flags & STYP_BSS) {
350	    	/* .bss section */
351	    	bss_size = scns[i].s_size;
352	  } else if (scns[i].s_flags & STYP_LIB) {
353	    	char *buf = 0, *ptr;
354	    	int foff = trunc_page(scns[i].s_scnptr);
355	    	int off = scns[i].s_scnptr - foff;
356	    	int len = round_page(scns[i].s_size + PAGE_SIZE);
357	    	int j;
358
359	    	if (error = vm_mmap(kernel_map, &buf, len,
360				 VM_PROT_READ, VM_PROT_READ, MAP_FILE,
361				 iparams->vnodep, foff)) {
362	      		return ENOEXEC;
363	    	}
364	    	for (j = off; j < scns[i].s_size + off; j++) {
365	      		char *libname;
366	      		libname = buf + j + 4 * *(long*)(buf + j + 4);
367	      		j += 4* *(long*)(buf + j);
368
369if (ibcs2_trace & IBCS2_TRACE_COFF) {
370printf("%s(%d):  shared library %s\n", __FILE__, __LINE__, libname);
371}
372	      		error = coff_load_file(iparams->proc, libname);
373	      		if (error)
374			break;
375	    	}
376	    	if (vm_deallocate(kernel_map, buf, len))
377	      		panic("exec_coff_imgact vm_deallocate failed");
378	    	if (error)
379	      		return error;
380	  	}
381	}
382	/*
383	 * Map in .text now
384	 */
385
386if (ibcs2_trace & IBCS2_TRACE_COFF) {
387printf("%s(%d):  load_coff_section(vmspace, "
388	"iparams->vnodep, %08lx, %08lx, 0x%x, 0x%x, 0x%x)\n",
389	__FILE__, __LINE__, text_offset, text_address,
390	text_size, text_size, VM_PROT_READ | VM_PROT_EXECUTE);
391}
392	if (error = load_coff_section(vmspace, iparams->vnodep,
393				      text_offset, (caddr_t)text_address,
394				      text_size, text_size,
395				      VM_PROT_READ | VM_PROT_EXECUTE)) {
396
397if (ibcs2_trace & IBCS2_TRACE_COFF) {
398printf("%s(%d): error = %d\n", __FILE__, __LINE__, error);
399}
400		return error;
401       	}
402	/*
403	 * Map in .data and .bss now
404	 */
405
406
407if (ibcs2_trace & IBCS2_TRACE_COFF) {
408printf("%s(%d): load_coff_section(vmspace, "
409	"iparams->vnodep, 0x%08lx, 0x%08lx, 0x%x, 0x%x, 0x%x)\n",
410	__FILE__, __LINE__, data_offset, data_address,
411	data_size + bss_size, data_size, VM_PROT_ALL);
412}
413	if (error = load_coff_section(vmspace, iparams->vnodep,
414				      data_offset, (caddr_t)data_address,
415				      data_size + bss_size, data_size,
416				      VM_PROT_ALL)) {
417
418if (ibcs2_trace & IBCS2_TRACE_COFF) {
419printf("%s(%d): error = %d\n", __FILE__, __LINE__, error);
420}
421		return error;
422	}
423
424	iparams->interpreted = 0;
425	iparams->proc->p_sysent = &ibcs2_svr3_sysvec;
426
427	vmspace->vm_tsize = round_page(text_size) >> PAGE_SHIFT;
428	vmspace->vm_dsize = round_page(data_size + bss_size) >> PAGE_SHIFT;
429	vmspace->vm_taddr = (caddr_t)text_address;
430	vmspace->vm_daddr = (caddr_t)data_address;
431
432	hole = (caddr_t)trunc_page(vmspace->vm_daddr) + ctob(vmspace->vm_dsize);
433
434
435if (ibcs2_trace & IBCS2_TRACE_COFF) {
436printf("%s(%d): vm_allocate(&vmspace->vm_map, &0x%08lx, 1, FALSE)\n",
437	__FILE__, __LINE__, hole);
438printf("imgact: error = %d\n", error);
439}
440	error = vm_allocate(&vmspace->vm_map, &hole, 1, FALSE);
441
442if (ibcs2_trace & IBCS2_TRACE_COFF) {
443printf("IBCS2: start vm_dsize = 0x%x, vm_daddr = 0x%x end = 0x%x\n",
444	ctob(vmspace->vm_dsize), vmspace->vm_daddr,
445	ctob(vmspace->vm_dsize) + vmspace->vm_daddr );
446printf("%s(%d):  returning successfully!\n", __FILE__, __LINE__);
447}
448	return 0;
449}
450
451/*
452 * Tell kern_execve.c about it, with a little help from the linker.
453 * Since `const' objects end up in the text segment, TEXT_SET is the
454 * correct directive to use.
455 */
456const struct execsw coff_execsw = { exec_coff_imgact, "coff" };
457TEXT_SET(execsw_set, coff_execsw);
458