2 * Copyright (c) 1998 Mark Newton
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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. All advertising materials mentioning features or use of this software
14 * must display the following acknowledgement:
15 * This product includes software developed by Christos Zoulas.
16 * 4. The name of the author may not be used to endorse or promote products
17 * derived from this software without specific prior written permission.
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
20 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
21 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
22 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
23 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
24 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
28 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 * $FreeBSD: src/sys/svr4/svr4_sysvec.c,v 1.10.2.2 2002/07/09 14:12:43 robert Exp $
31 * $DragonFly: src/sys/emulation/svr4/Attic/svr4_sysvec.c,v 1.11 2004/11/12 00:09:22 dillon Exp $
34 /* XXX we use functions that might not exist. */
35 #include "opt_compat.h"
38 #error "Unable to compile SVR4-emulator due to missing COMPAT_43 option!"
41 #include <sys/param.h>
42 #include <sys/systm.h>
45 #include <sys/sysent.h>
46 #include <sys/imgact.h>
47 #include <sys/imgact_elf.h>
48 #include <sys/socket.h>
49 #include <sys/malloc.h>
50 #include <sys/nlookup.h>
51 #include <sys/vnode.h>
52 #include <sys/module.h>
54 #include <vm/vm_zone.h>
56 #include <sys/kernel.h>
57 #include <machine/cpu.h>
58 #include <netinet/in.h>
60 #include <emulation/43bsd/43bsd_socket.h>
63 #include "svr4_types.h"
64 #include "svr4_syscall.h"
65 #include "svr4_signal.h"
66 #include "svr4_sockio.h"
67 #include "svr4_socket.h"
68 #include "svr4_errno.h"
69 #include "svr4_proto.h"
70 #include "svr4_siginfo.h"
71 #include "svr4_util.h"
73 int bsd_to_svr4_errno[ELAST+1] = {
117 SVR4_EPROTONOSUPPORT,
118 SVR4_ESOCKTNOSUPPORT,
161 static int svr4_fixup(register_t **stack_base, struct image_params *imgp);
163 extern struct sysent svr4_sysent[];
167 extern int svr4_szsigcode;
168 extern char svr4_sigcode[];
170 struct sysentvec svr4_sysvec = {
190 Elf32_Brandinfo svr4_brand = {
198 const char svr4_emul_path[] = "/compat/svr4";
201 svr4_fixup(register_t **stack_base, struct image_params *imgp)
203 Elf32_Auxargs *args = (Elf32_Auxargs *)imgp->auxargs;
206 pos = *stack_base + (imgp->args->argc + imgp->args->envc + 2);
209 AUXARGS_ENTRY(pos, AT_DEBUG, 1);
211 if (args->execfd != -1) {
212 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
214 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
215 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
216 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
217 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
218 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
219 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
220 AUXARGS_ENTRY(pos, AT_BASE, args->base);
221 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_ucred->cr_ruid);
222 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_ucred->cr_svuid);
223 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_ucred->cr_rgid);
224 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_ucred->cr_svgid);
225 AUXARGS_ENTRY(pos, AT_NULL, 0);
227 free(imgp->auxargs, M_TEMP);
228 imgp->auxargs = NULL;
231 **stack_base = (int)imgp->args->argc;
236 * Search an alternate path before passing pathname arguments on
237 * to system calls. Useful for keeping a separate 'emulation tree'.
239 * If cflag is set, we check if an attempt can be made to create
240 * the named file, i.e. we check if the directory it should
243 * Code shamelessly stolen by Mark Newton from IBCS2 emulation code.
246 svr4_emul_find(sgp, prefix, path, pbuf, cflag)
247 caddr_t *sgp; /* Pointer to stackgap memory */
253 struct thread *td = curthread; /* XXX */
254 struct nlookupdata nd;
255 struct nlookupdata ndroot;
257 struct vattr vatroot;
260 char *ptr, *buf, *cp;
264 KKASSERT(td->td_proc);
265 cred = td->td_proc->p_ucred;
267 buf = (char *) malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
270 for (ptr = buf; (*ptr = *prefix) != '\0'; ptr++, prefix++)
273 sz = MAXPATHLEN - (ptr - buf);
276 * If sgp is not given then the path is already in kernel space
279 error = copystr(path, ptr, sz, &len);
281 error = copyinstr(path, ptr, sz, &len);
294 * We know that there is a / somewhere in this pathname.
295 * Search backwards for it, to find the file's parent dir
296 * to see if it exists in the alternate tree. If it does,
297 * and we want to create a file (cflag is set). We don't
298 * need to worry about the root comparison in this case.
302 for (cp = &ptr[len] - 1; *cp != '/'; cp--);
305 error = nlookup_init(&nd, buf, UIO_SYSSPACE, NLC_FOLLOW);
307 error = nlookup(&nd);
315 error = nlookup_init(&nd, buf, UIO_SYSSPACE, NLC_FOLLOW);
317 error = nlookup(&nd);
320 error = cache_vref(nd.nl_ncp, nd.nl_cred, &vp);
326 error = VOP_GETATTR(vp, &vat, td);
332 * We now compare the vnode of the svr4_root to the one
333 * vnode asked. If they resolve to be the same, then we
334 * ignore the match so that the real root gets used.
335 * This avoids the problem of traversing "../.." to find the
336 * root directory and never finding it, because "/" resolves
337 * to the emulation root directory. This is expensive :-(
339 error = nlookup_init(&ndroot, svr4_emul_path, UIO_SYSSPACE,
342 error = nlookup(&ndroot);
345 error = cache_vref(ndroot.nl_ncp, ndroot.nl_cred, &vp);
346 nlookup_done(&ndroot);
351 error = VOP_GETATTR(vp, &vatroot, td);
356 if (vat.va_fsid == vatroot.va_fsid &&
357 vat.va_fileid == vatroot.va_fileid) {
365 sz = &ptr[len] - buf;
366 *pbuf = stackgap_alloc(sgp, sz + 1);
367 error = copyout(buf, *pbuf, sz);
375 svr4_elf_modevent(module_t mod, int type, void *data)
383 if (elf_insert_brand_entry(&svr4_brand) < 0)
386 printf("cannot insert svr4 elf brand handler\n");
387 else if (bootverbose)
388 printf("svr4 ELF exec handler installed\n");
391 /* Only allow the emulator to be removed if it isn't in use. */
392 if (elf_brand_inuse(&svr4_brand) != 0) {
394 } else if (elf_remove_brand_entry(&svr4_brand) < 0) {
399 printf("Could not deinstall ELF interpreter entry (error %d)\n",
401 else if (bootverbose)
402 printf("svr4 ELF exec handler removed\n");
410 static moduledata_t svr4_elf_mod = {
415 DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);