Annotation of sys/compat/linux/linux_exec.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: linux_exec.c,v 1.25 2006/01/19 17:54:52 mickey Exp $ */
2: /* $NetBSD: linux_exec.c,v 1.13 1996/04/05 00:01:10 christos Exp $ */
3:
4: /*-
5: * Copyright (c) 1994, 1995, 1998, 2000 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Christos Zoulas, Frank van der Linden, Eric Haszlakiewicz and
10: * Thor Lancelot Simon.
11: *
12: * Redistribution and use in source and binary forms, with or without
13: * modification, are permitted provided that the following conditions
14: * are met:
15: * 1. Redistributions of source code must retain the above copyright
16: * notice, this list of conditions and the following disclaimer.
17: * 2. Redistributions in binary form must reproduce the above copyright
18: * notice, this list of conditions and the following disclaimer in the
19: * documentation and/or other materials provided with the distribution.
20: * 3. All advertising materials mentioning features or use of this software
21: * must display the following acknowledgement:
22: * This product includes software developed by the NetBSD
23: * Foundation, Inc. and its contributors.
24: * 4. Neither the name of The NetBSD Foundation nor the names of its
25: * contributors may be used to endorse or promote products derived
26: * from this software without specific prior written permission.
27: *
28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
38: * POSSIBILITY OF SUCH DAMAGE.
39: */
40:
41: #include <sys/param.h>
42: #include <sys/systm.h>
43: #include <sys/kernel.h>
44: #include <sys/proc.h>
45: #include <sys/malloc.h>
46: #include <sys/namei.h>
47: #include <sys/vnode.h>
48: #include <sys/mount.h>
49: #include <sys/exec.h>
50: #include <sys/exec_elf.h>
51: #include <sys/exec_olf.h>
52:
53: #include <sys/mman.h>
54: #include <sys/syscallargs.h>
55:
56: #include <uvm/uvm_extern.h>
57:
58: #include <machine/cpu.h>
59: #include <machine/reg.h>
60: #include <machine/linux_machdep.h>
61:
62: #include <compat/linux/linux_types.h>
63: #include <compat/linux/linux_syscall.h>
64: #include <compat/linux/linux_signal.h>
65: #include <compat/linux/linux_syscallargs.h>
66: #include <compat/linux/linux_util.h>
67: #include <compat/linux/linux_exec.h>
68: #include <compat/linux/linux_emuldata.h>
69:
70: static void *linux_aout_copyargs(struct exec_package *,
71: struct ps_strings *, void *, void *);
72:
73: #define LINUX_AOUT_AUX_ARGSIZ 2
74: #define LINUX_ELF_AUX_ARGSIZ (sizeof(AuxInfo) * 8 / sizeof(char *))
75:
76:
77: const char linux_emul_path[] = "/emul/linux";
78: extern int linux_error[];
79: extern char linux_sigcode[], linux_esigcode[];
80: extern struct sysent linux_sysent[];
81: #ifdef SYSCALL_DEBUG
82: extern char *linux_syscallnames[];
83: #endif
84:
85: int exec_linux_aout_prep_zmagic(struct proc *, struct exec_package *);
86: int exec_linux_aout_prep_nmagic(struct proc *, struct exec_package *);
87: int exec_linux_aout_prep_omagic(struct proc *, struct exec_package *);
88: int exec_linux_aout_prep_qmagic(struct proc *, struct exec_package *);
89:
90: void linux_e_proc_exec(struct proc *, struct exec_package *);
91: void linux_e_proc_fork(struct proc *, struct proc *);
92: void linux_e_proc_exit(struct proc *);
93: void linux_e_proc_init(struct proc *, struct vmspace *);
94:
95: struct emul emul_linux_aout = {
96: "linux",
97: linux_error,
98: linux_sendsig,
99: LINUX_SYS_syscall,
100: LINUX_SYS_MAXSYSCALL,
101: linux_sysent,
102: #ifdef SYSCALL_DEBUG
103: linux_syscallnames,
104: #else
105: NULL,
106: #endif
107: LINUX_AOUT_AUX_ARGSIZ,
108: linux_aout_copyargs,
109: setregs,
110: NULL,
111: linux_sigcode,
112: linux_esigcode,
113: 0,
114: NULL,
115: linux_e_proc_exec,
116: linux_e_proc_fork,
117: linux_e_proc_exit,
118: };
119:
120: struct emul emul_linux_elf = {
121: "linux",
122: linux_error,
123: linux_sendsig,
124: LINUX_SYS_syscall,
125: LINUX_SYS_MAXSYSCALL,
126: linux_sysent,
127: #ifdef SYSCALL_DEBUG
128: linux_syscallnames,
129: #else
130: NULL,
131: #endif
132: LINUX_ELF_AUX_ARGSIZ,
133: elf32_copyargs,
134: setregs,
135: exec_elf32_fixup,
136: linux_sigcode,
137: linux_esigcode,
138: 0,
139: NULL,
140: linux_e_proc_exec,
141: linux_e_proc_fork,
142: linux_e_proc_exit,
143: };
144:
145: /*
146: * Allocate per-process structures. Called when executing Linux
147: * process. We can reuse the old emuldata - if it's not null,
148: * the executed process is of same emulation as original forked one.
149: */
150: void
151: linux_e_proc_init(p, vmspace)
152: struct proc *p;
153: struct vmspace *vmspace;
154: {
155: if (!p->p_emuldata) {
156: /* allocate new Linux emuldata */
157: MALLOC(p->p_emuldata, void *, sizeof(struct linux_emuldata),
158: M_EMULDATA, M_WAITOK);
159: }
160:
161: memset(p->p_emuldata, '\0', sizeof(struct linux_emuldata));
162:
163: /* Set the process idea of the break to the real value */
164: ((struct linux_emuldata *)(p->p_emuldata))->p_break =
165: vmspace->vm_daddr + ctob(vmspace->vm_dsize);
166: }
167:
168: void
169: linux_e_proc_exec(p, epp)
170: struct proc *p;
171: struct exec_package *epp;
172: {
173: /* exec, use our vmspace */
174: linux_e_proc_init(p, p->p_vmspace);
175: }
176:
177: /*
178: * Emulation per-process exit hook.
179: */
180: void
181: linux_e_proc_exit(p)
182: struct proc *p;
183: {
184: /* free Linux emuldata and set the pointer to null */
185: FREE(p->p_emuldata, M_EMULDATA);
186: p->p_emuldata = NULL;
187: }
188:
189: /*
190: * Emulation fork hook.
191: */
192: void
193: linux_e_proc_fork(p, parent)
194: struct proc *p, *parent;
195: {
196: /*
197: * It could be desirable to copy some stuff from parent's
198: * emuldata. We don't need anything like that for now.
199: * So just allocate new emuldata for the new process.
200: */
201: p->p_emuldata = NULL;
202:
203: /* fork, use parent's vmspace (our vmspace may not be setup yet) */
204: linux_e_proc_init(p, parent->p_vmspace);
205: }
206:
207: static void *
208: linux_aout_copyargs(pack, arginfo, stack, argp)
209: struct exec_package *pack;
210: struct ps_strings *arginfo;
211: void *stack;
212: void *argp;
213: {
214: char **cpp = stack;
215: char **stk = stack;
216: char *dp, *sp;
217: size_t len;
218: void *nullp = NULL;
219: int argc = arginfo->ps_nargvstr;
220: int envc = arginfo->ps_nenvstr;
221:
222: if (copyout(&argc, cpp++, sizeof(argc)))
223: return (NULL);
224:
225: /* leave room for envp and argv */
226: cpp += 2;
227: if (copyout(&cpp, &stk[1], sizeof (cpp)))
228: return (NULL);
229:
230: dp = (char *)(cpp + argc + envc + 2);
231: sp = argp;
232:
233: /* XXX don't copy them out, remap them! */
234: arginfo->ps_argvstr = cpp; /* remember location of argv for later */
235:
236: for (; --argc >= 0; sp += len, dp += len)
237: if (copyout(&dp, cpp++, sizeof(dp)) ||
238: copyoutstr(sp, dp, ARG_MAX, &len))
239: return (NULL);
240:
241: if (copyout(&nullp, cpp++, sizeof(nullp)))
242: return (NULL);
243:
244: if (copyout(&cpp, &stk[2], sizeof (cpp)))
245: return (NULL);
246:
247: arginfo->ps_envstr = cpp; /* remember location of envp for later */
248:
249: for (; --envc >= 0; sp += len, dp += len)
250: if (copyout(&dp, cpp++, sizeof(dp)) ||
251: copyoutstr(sp, dp, ARG_MAX, &len))
252: return (NULL);
253:
254: if (copyout(&nullp, cpp++, sizeof(nullp)))
255: return (NULL);
256:
257: return (cpp);
258: }
259:
260: int
261: exec_linux_aout_makecmds(p, epp)
262: struct proc *p;
263: struct exec_package *epp;
264: {
265: struct exec *linux_ep = epp->ep_hdr;
266: int machtype, magic;
267: int error = ENOEXEC;
268:
269: if (epp->ep_hdrvalid < sizeof(struct exec))
270: return (ENOEXEC);
271:
272: magic = LINUX_N_MAGIC(linux_ep);
273: machtype = LINUX_N_MACHTYPE(linux_ep);
274:
275:
276: if (machtype != LINUX_MID_MACHINE)
277: return (ENOEXEC);
278:
279: switch (magic) {
280: case QMAGIC:
281: error = exec_linux_aout_prep_qmagic(p, epp);
282: break;
283: case ZMAGIC:
284: error = exec_linux_aout_prep_zmagic(p, epp);
285: break;
286: case NMAGIC:
287: error = exec_linux_aout_prep_nmagic(p, epp);
288: break;
289: case OMAGIC:
290: error = exec_linux_aout_prep_omagic(p, epp);
291: break;
292: }
293: if (error == 0)
294: epp->ep_emul = &emul_linux_aout;
295: return (error);
296: }
297:
298: /*
299: * Since text starts at 0x400 in Linux ZMAGIC executables, and 0x400
300: * is very likely not page aligned on most architectures, it is treated
301: * as an NMAGIC here. XXX
302: */
303:
304: int
305: exec_linux_aout_prep_zmagic(p, epp)
306: struct proc *p;
307: struct exec_package *epp;
308: {
309: struct exec *execp = epp->ep_hdr;
310:
311: epp->ep_taddr = LINUX_N_TXTADDR(*execp, ZMAGIC);
312: epp->ep_tsize = execp->a_text;
313: epp->ep_daddr = LINUX_N_DATADDR(*execp, ZMAGIC);
314: epp->ep_dsize = execp->a_data + execp->a_bss;
315: epp->ep_entry = execp->a_entry;
316:
317: /* set up command for text segment */
318: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
319: epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, ZMAGIC),
320: VM_PROT_READ|VM_PROT_EXECUTE);
321:
322: /* set up command for data segment */
323: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
324: epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, ZMAGIC),
325: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
326:
327: /* set up command for bss segment */
328: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
329: epp->ep_daddr + execp->a_data, NULLVP, 0,
330: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
331:
332: return (exec_setup_stack(p, epp));
333: }
334:
335: /*
336: * exec_aout_prep_nmagic(): Prepare Linux NMAGIC package.
337: * Not different from the normal stuff.
338: */
339:
340: int
341: exec_linux_aout_prep_nmagic(p, epp)
342: struct proc *p;
343: struct exec_package *epp;
344: {
345: struct exec *execp = epp->ep_hdr;
346: long bsize, baddr;
347:
348: epp->ep_taddr = LINUX_N_TXTADDR(*execp, NMAGIC);
349: epp->ep_tsize = execp->a_text;
350: epp->ep_daddr = LINUX_N_DATADDR(*execp, NMAGIC);
351: epp->ep_dsize = execp->a_data + execp->a_bss;
352: epp->ep_entry = execp->a_entry;
353:
354: /* set up command for text segment */
355: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_text,
356: epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, NMAGIC),
357: VM_PROT_READ|VM_PROT_EXECUTE);
358:
359: /* set up command for data segment */
360: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn, execp->a_data,
361: epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, NMAGIC),
362: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
363:
364: /* set up command for bss segment */
365: baddr = round_page(epp->ep_daddr + execp->a_data);
366: bsize = epp->ep_daddr + epp->ep_dsize - baddr;
367: if (bsize > 0)
368: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
369: NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
370:
371: return (exec_setup_stack(p, epp));
372: }
373:
374: /*
375: * exec_aout_prep_omagic(): Prepare Linux OMAGIC package.
376: * Business as usual.
377: */
378:
379: int
380: exec_linux_aout_prep_omagic(p, epp)
381: struct proc *p;
382: struct exec_package *epp;
383: {
384: struct exec *execp = epp->ep_hdr;
385: long dsize, bsize, baddr;
386:
387: epp->ep_taddr = LINUX_N_TXTADDR(*execp, OMAGIC);
388: epp->ep_tsize = execp->a_text;
389: epp->ep_daddr = LINUX_N_DATADDR(*execp, OMAGIC);
390: epp->ep_dsize = execp->a_data + execp->a_bss;
391: epp->ep_entry = execp->a_entry;
392:
393: /* set up command for text and data segments */
394: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_readvn,
395: execp->a_text + execp->a_data, epp->ep_taddr, epp->ep_vp,
396: LINUX_N_TXTOFF(*execp, OMAGIC), VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
397:
398: /* set up command for bss segment */
399: baddr = round_page(epp->ep_daddr + execp->a_data);
400: bsize = epp->ep_daddr + epp->ep_dsize - baddr;
401: if (bsize > 0)
402: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, bsize, baddr,
403: NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
404:
405: /*
406: * Make sure (# of pages) mapped above equals (vm_tsize + vm_dsize);
407: * obreak(2) relies on this fact. Both `vm_tsize' and `vm_dsize' are
408: * computed (in execve(2)) by rounding *up* `ep_tsize' and `ep_dsize'
409: * respectively to page boundaries.
410: * Compensate `ep_dsize' for the amount of data covered by the last
411: * text page.
412: */
413: dsize = epp->ep_dsize + execp->a_text - round_page(execp->a_text);
414: epp->ep_dsize = (dsize > 0) ? dsize : 0;
415: return (exec_setup_stack(p, epp));
416: }
417:
418: int
419: exec_linux_aout_prep_qmagic(p, epp)
420: struct proc *p;
421: struct exec_package *epp;
422: {
423: struct exec *execp = epp->ep_hdr;
424:
425: epp->ep_taddr = LINUX_N_TXTADDR(*execp, QMAGIC);
426: epp->ep_tsize = execp->a_text;
427: epp->ep_daddr = LINUX_N_DATADDR(*execp, QMAGIC);
428: epp->ep_dsize = execp->a_data + execp->a_bss;
429: epp->ep_entry = execp->a_entry;
430:
431: /*
432: * check if vnode is in open for writing, because we want to
433: * demand-page out of it. if it is, don't do it, for various
434: * reasons
435: */
436: if ((execp->a_text != 0 || execp->a_data != 0) &&
437: epp->ep_vp->v_writecount != 0) {
438: #ifdef DIAGNOSTIC
439: if (epp->ep_vp->v_flag & VTEXT)
440: panic("exec: a VTEXT vnode has writecount != 0");
441: #endif
442: return (ETXTBSY);
443: }
444: vn_marktext(epp->ep_vp);
445:
446: /* set up command for text segment */
447: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_text,
448: epp->ep_taddr, epp->ep_vp, LINUX_N_TXTOFF(*execp, QMAGIC),
449: VM_PROT_READ|VM_PROT_EXECUTE);
450:
451: /* set up command for data segment */
452: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_pagedvn, execp->a_data,
453: epp->ep_daddr, epp->ep_vp, LINUX_N_DATOFF(*execp, QMAGIC),
454: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
455:
456: /* set up command for bss segment */
457: NEW_VMCMD(&epp->ep_vmcmds, vmcmd_map_zero, execp->a_bss,
458: epp->ep_daddr + execp->a_data, NULLVP, 0,
459: VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
460:
461: return (exec_setup_stack(p, epp));
462: }
463:
464: int
465: exec_linux_elf32_makecmds(struct proc *p, struct exec_package *epp)
466: {
467: if (!(emul_linux_elf.e_flags & EMUL_ENABLED))
468: return (ENOEXEC);
469: return exec_elf32_makecmds(p, epp);
470: }
471:
472: int
473: linux_elf_probe(p, epp, itp, pos, os)
474: struct proc *p;
475: struct exec_package *epp;
476: char *itp;
477: u_long *pos;
478: u_int8_t *os;
479: {
480: Elf32_Ehdr *eh = epp->ep_hdr;
481: char *bp, *brand;
482: int error;
483: size_t len;
484:
485: brand = elf32_check_brand(eh);
486: if (brand && strcmp(brand, "Linux"))
487: return (EINVAL);
488: if (itp) {
489: if ((error = emul_find(p, NULL, linux_emul_path, itp, &bp, 0)))
490: return (error);
491: if ((error = copystr(bp, itp, MAXPATHLEN, &len)))
492: return (error);
493: free(bp, M_TEMP);
494: }
495: epp->ep_emul = &emul_linux_elf;
496: *pos = ELF32_NO_ADDR;
497: if (*os == OOS_NULL)
498: *os = OOS_LINUX;
499: return (0);
500: }
501:
502: /*
503: * The Linux system call to load shared libraries, a.out version. The
504: * a.out shared libs are just files that are mapped onto a fixed
505: * address in the process' address space. The address is given in
506: * a_entry. Read in the header, set up some VM commands and run them.
507: *
508: * Yes, both text and data are mapped at once, so we're left with
509: * writeable text for the shared libs. The Linux crt0 seemed to break
510: * sometimes when data was mapped separately. It munmapped a uselib()
511: * of ld.so by hand, which failed with shared text and data for ld.so
512: * Yuck.
513: *
514: * Because of the problem with ZMAGIC executables (text starts
515: * at 0x400 in the file, but needs to be mapped at 0), ZMAGIC
516: * shared libs are not handled very efficiently :-(
517: */
518:
519: int
520: linux_sys_uselib(p, v, retval)
521: struct proc *p;
522: void *v;
523: register_t *retval;
524: {
525: struct linux_sys_uselib_args /* {
526: syscallarg(char *) path;
527: } */ *uap = v;
528: caddr_t sg;
529: long bsize, dsize, tsize, taddr, baddr, daddr;
530: struct nameidata ni;
531: struct vnode *vp;
532: struct exec hdr;
533: struct exec_vmcmd_set vcset;
534: int i, magic, error;
535: size_t rem;
536:
537: sg = stackgap_init(p->p_emul);
538: LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
539:
540: NDINIT(&ni, LOOKUP, FOLLOW, UIO_USERSPACE, SCARG(uap, path), p);
541:
542: if ((error = namei(&ni)))
543: return (error);
544:
545: vp = ni.ni_vp;
546:
547: if ((error = vn_rdwr(UIO_READ, vp, (caddr_t) &hdr, LINUX_AOUT_HDR_SIZE,
548: 0, UIO_SYSSPACE, IO_NODELOCKED, p->p_ucred,
549: &rem, p))) {
550: vrele(vp);
551: return (error);
552: }
553:
554: if (rem != 0) {
555: vrele(vp);
556: return (ENOEXEC);
557: }
558:
559: if (LINUX_N_MACHTYPE(&hdr) != LINUX_MID_MACHINE)
560: return (ENOEXEC);
561:
562: magic = LINUX_N_MAGIC(&hdr);
563: taddr = trunc_page(hdr.a_entry);
564: tsize = hdr.a_text;
565: daddr = taddr + tsize;
566: dsize = hdr.a_data + hdr.a_bss;
567:
568: if ((hdr.a_text != 0 || hdr.a_data != 0) && vp->v_writecount != 0) {
569: vrele(vp);
570: return (ETXTBSY);
571: }
572: vn_marktext(vp);
573:
574: VMCMDSET_INIT(&vcset);
575:
576: NEW_VMCMD(
577: &vcset, magic == ZMAGIC ? vmcmd_map_readvn : vmcmd_map_pagedvn,
578: hdr.a_text + hdr.a_data, taddr, vp, LINUX_N_TXTOFF(hdr, magic),
579: VM_PROT_READ|VM_PROT_EXECUTE|VM_PROT_WRITE);
580:
581: baddr = round_page(daddr + hdr.a_data);
582: bsize = daddr + dsize - baddr;
583: if (bsize > 0) {
584: NEW_VMCMD(&vcset, vmcmd_map_zero, bsize, baddr,
585: NULLVP, 0, VM_PROT_READ|VM_PROT_WRITE|VM_PROT_EXECUTE);
586: }
587:
588: for (i = 0; i < vcset.evs_used && !error; i++) {
589: struct exec_vmcmd *vcp;
590:
591: vcp = &vcset.evs_cmds[i];
592: error = (*vcp->ev_proc)(p, vcp);
593: }
594:
595: kill_vmcmds(&vcset);
596:
597: vrele(vp);
598:
599: return (error);
600: }
601:
602: /*
603: * Execve(2). Just check the alternate emulation path, and pass it on
604: * to the regular execve().
605: */
606: int
607: linux_sys_execve(p, v, retval)
608: struct proc *p;
609: void *v;
610: register_t *retval;
611: {
612: struct linux_sys_execve_args /* {
613: syscallarg(char *) path;
614: syscallarg(char **) argv;
615: syscallarg(char **) envp;
616: } */ *uap = v;
617: struct sys_execve_args ap;
618: caddr_t sg;
619:
620: sg = stackgap_init(p->p_emul);
621: LINUX_CHECK_ALT_EXIST(p, &sg, SCARG(uap, path));
622:
623: SCARG(&ap, path) = SCARG(uap, path);
624: SCARG(&ap, argp) = SCARG(uap, argp);
625: SCARG(&ap, envp) = SCARG(uap, envp);
626:
627: return (sys_execve(p, &ap, retval));
628: }
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