cpu_exec.c revision 1.3 
1/*	$NetBSD: cpu_exec.c,v 1.3 2012/08/11 07:18:53 matt Exp $	*/
2
3/*-
4 * Copyright (c) 2012 The NetBSD Foundation, Inc.
5 * All rights reserved.
6 *
7 * This code is derived from software contributed to The NetBSD Foundation
8 * by Matt Thomas of 3am Software Foundry.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29 * POSSIBILITY OF SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33__KERNEL_RCSID(0, "$NetBSD: cpu_exec.c,v 1.3 2012/08/11 07:18:53 matt Exp $");
34
35#include "opt_compat_netbsd.h"
36#include "opt_compat_netbsd32.h"
37
38#include <sys/param.h>
39#include <sys/systm.h>
40#include <sys/proc.h>
41#include <sys/exec.h>
42
43#include <uvm/uvm_extern.h>
44
45#include <compat/common/compat_util.h>
46#include <sys/exec_elf.h>			/* mandatory */
47
48#ifdef COMPAT_NETBSD32
49#include <compat/netbsd32/netbsd32_exec.h>
50#endif
51
52#if EXEC_ELF32
53int
54arm_netbsd_elf32_probe(struct lwp *l, struct exec_package *epp, void *eh0,
55	char *itp, vaddr_t *start_p)
56{
57	const char *itp_suffix = NULL;
58	const Elf_Ehdr * const eh = eh0;
59	const bool elf_aapcs_p =
60	    (eh->e_flags & EF_ARM_EABIMASK) >= EF_ARM_EABI_VER4;
61#ifdef COMPAT_NETBSD32
62	const bool netbsd32_p = (epp->ep_esch->es_emul == &emul_netbsd32);
63#else
64	const bool netbsd32_p = false;
65#endif
66#ifdef __ARM_EABI__
67	const bool aapcs_p = true;
68#else
69	const bool aapcs_p = false;
70#endif
71
72	/*
73	 * This is subtle.  If are netbsd32, then we don't want to match the
74	 * same ABI as the kernel.  If we aren't (netbsd32 == false), then we
75	 * don't want to be different from the kernel's ABI.
76	 *    true   true   true  ENOEXEC
77	 *    true   false  true  0
78	 *    true   true   false 0
79	 *    true   false  false ENOEXEC
80	 *    false  true   true  0
81	 *    false  false  true  ENOEXEC
82	 *    false  true   false ENOEXEC
83	 *    false  false  false 0
84	 */
85	if (netbsd32_p ^ elf_aapcs_p ^ aapcs_p)
86		return ENOEXEC;
87
88	if (netbsd32_p)
89		itp_suffix = (elf_aapcs_p) ? "eabi" : "oabi";
90
91	if (itp_suffix != NULL)
92		(void)compat_elf_check_interp(epp, itp, itp_suffix);
93	return 0;
94}
95#endif
96