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.
33 /* XXX we use functions that might not exist. */
34 #include "opt_compat.h"
37 #error "Unable to compile SVR4-emulator due to missing COMPAT_43 option!"
40 #include <sys/param.h>
41 #include <sys/systm.h>
44 #include <sys/sysent.h>
45 #include <sys/imgact.h>
46 #include <sys/imgact_elf.h>
47 #include <sys/socket.h>
48 #include <sys/sockio.h>
49 #include <sys/signalvar.h>
50 #include <sys/malloc.h>
51 #include <sys/namei.h>
52 #include <sys/vnode.h>
53 #include <sys/module.h>
55 #include <vm/vm_param.h>
56 #include <vm/vm_prot.h>
57 #include <vm/vm_page.h>
58 #include <vm/vm_extern.h>
60 #include <sys/kernel.h>
61 #include <machine/cpu.h>
62 #include <netinet/in.h>
64 #include <svr4/svr4.h>
65 #include <svr4/svr4_types.h>
66 #include <svr4/svr4_syscall.h>
67 #include <svr4/svr4_signal.h>
68 #include <svr4/svr4_sockio.h>
69 #include <svr4/svr4_socket.h>
70 #include <svr4/svr4_errno.h>
71 #include <svr4/svr4_proto.h>
72 #include <svr4/svr4_siginfo.h>
73 #include <svr4/svr4_util.h>
75 int bsd_to_svr4_errno[ELAST+1] = {
119 SVR4_EPROTONOSUPPORT,
120 SVR4_ESOCKTNOSUPPORT,
163 static int svr4_fixup(long **stack_base, struct image_params *imgp);
165 extern struct sysent svr4_sysent[];
169 extern int svr4_szsigcode;
170 extern char svr4_sigcode[];
172 struct sysentvec svr4_sysvec = {
190 Elf32_Brandinfo svr4_brand = {
197 const char svr4_emul_path[] = "/compat/svr4";
200 svr4_fixup(long **stack_base, struct image_params *imgp)
202 Elf32_Auxargs *args = (Elf32_Auxargs *)imgp->auxargs;
205 pos = *stack_base + (imgp->argc + imgp->envc + 2);
208 AUXARGS_ENTRY(pos, AT_DEBUG, 1);
210 if (args->execfd != -1) {
211 AUXARGS_ENTRY(pos, AT_EXECFD, args->execfd);
213 AUXARGS_ENTRY(pos, AT_PHDR, args->phdr);
214 AUXARGS_ENTRY(pos, AT_PHENT, args->phent);
215 AUXARGS_ENTRY(pos, AT_PHNUM, args->phnum);
216 AUXARGS_ENTRY(pos, AT_PAGESZ, args->pagesz);
217 AUXARGS_ENTRY(pos, AT_FLAGS, args->flags);
218 AUXARGS_ENTRY(pos, AT_ENTRY, args->entry);
219 AUXARGS_ENTRY(pos, AT_BASE, args->base);
220 AUXARGS_ENTRY(pos, AT_UID, imgp->proc->p_cred->p_ruid);
221 AUXARGS_ENTRY(pos, AT_EUID, imgp->proc->p_cred->p_svuid);
222 AUXARGS_ENTRY(pos, AT_GID, imgp->proc->p_cred->p_rgid);
223 AUXARGS_ENTRY(pos, AT_EGID, imgp->proc->p_cred->p_svgid);
224 AUXARGS_ENTRY(pos, AT_NULL, 0);
226 free(imgp->auxargs, M_TEMP);
227 imgp->auxargs = NULL;
230 **stack_base = (int)imgp->argc;
235 * Search an alternate path before passing pathname arguments on
236 * to system calls. Useful for keeping a seperate 'emulation tree'.
238 * If cflag is set, we check if an attempt can be made to create
239 * the named file, i.e. we check if the directory it should
242 * Code shamelessly stolen by Mark Newton from IBCS2 emulation code.
245 svr4_emul_find(p, sgp, prefix, path, pbuf, cflag)
247 caddr_t *sgp; /* Pointer to stackgap memory */
254 struct nameidata ndroot;
256 struct vattr vatroot;
258 char *ptr, *buf, *cp;
261 buf = (char *) malloc(MAXPATHLEN, M_TEMP, M_WAITOK);
264 for (ptr = buf; (*ptr = *prefix) != '\0'; ptr++, prefix++)
267 sz = MAXPATHLEN - (ptr - buf);
270 * If sgp is not given then the path is already in kernel space
273 error = copystr(path, ptr, sz, &len);
275 error = copyinstr(path, ptr, sz, &len);
288 * We know that there is a / somewhere in this pathname.
289 * Search backwards for it, to find the file's parent dir
290 * to see if it exists in the alternate tree. If it does,
291 * and we want to create a file (cflag is set). We don't
292 * need to worry about the root comparison in this case.
296 for (cp = &ptr[len] - 1; *cp != '/'; cp--);
299 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
301 if ((error = namei(&nd)) != 0) {
309 NDINIT(&nd, LOOKUP, FOLLOW, UIO_SYSSPACE, buf, p);
311 if ((error = namei(&nd)) != 0) {
317 * We now compare the vnode of the svr4_root to the one
318 * vnode asked. If they resolve to be the same, then we
319 * ignore the match so that the real root gets used.
320 * This avoids the problem of traversing "../.." to find the
321 * root directory and never finding it, because "/" resolves
322 * to the emulation root directory. This is expensive :-(
324 NDINIT(&ndroot, LOOKUP, FOLLOW, UIO_SYSSPACE, svr4_emul_path,
327 if ((error = namei(&ndroot)) != 0) {
334 if ((error = VOP_GETATTR(nd.ni_vp, &vat, p->p_ucred, p)) != 0) {
338 if ((error = VOP_GETATTR(ndroot.ni_vp, &vatroot, p->p_ucred, p))
343 if (vat.va_fsid == vatroot.va_fsid &&
344 vat.va_fileid == vatroot.va_fileid) {
353 sz = &ptr[len] - buf;
354 *pbuf = stackgap_alloc(sgp, sz + 1);
355 error = copyout(buf, *pbuf, sz);
368 svr4_elf_modevent(module_t mod, int type, void *data)
376 if (elf_insert_brand_entry(&svr4_brand) < 0)
379 printf("cannot insert svr4 elf brand handler\n");
380 else if (bootverbose)
381 printf("svr4 ELF exec handler installed\n");
384 /* Only allow the emulator to be removed if it isn't in use. */
385 if (elf_brand_inuse(&svr4_brand) != 0) {
387 } else if (elf_remove_brand_entry(&svr4_brand) < 0) {
392 printf("Could not deinstall ELF interpreter entry (error %d)\n",
394 else if (bootverbose)
395 printf("svr4 ELF exec handler removed\n");
403 static moduledata_t svr4_elf_mod = {
408 DECLARE_MODULE(svr4elf, svr4_elf_mod, SI_SUB_EXEC, SI_ORDER_ANY);