Annotation of sys/compat/freebsd/freebsd_exec.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: freebsd_exec.c,v 1.17 2006/01/19 17:54:50 mickey Exp $ */
2: /* $NetBSD: freebsd_exec.c,v 1.2 1996/05/18 16:02:08 christos Exp $ */
3:
4: /*
5: * Copyright (c) 1993, 1994 Christopher G. Demetriou
6: * All rights reserved.
7: *
8: * Redistribution and use in source and binary forms, with or without
9: * modification, are permitted provided that the following conditions
10: * are met:
11: * 1. Redistributions of source code must retain the above copyright
12: * notice, this list of conditions and the following disclaimer.
13: * 2. Redistributions in binary form must reproduce the above copyright
14: * notice, this list of conditions and the following disclaimer in the
15: * documentation and/or other materials provided with the distribution.
16: * 3. All advertising materials mentioning features or use of this software
17: * must display the following acknowledgement:
18: * This product includes software developed by Christopher G. Demetriou.
19: * 4. The name of the author may not be used to endorse or promote products
20: * derived from this software without specific prior written permission
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
23: * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24: * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25: * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
26: * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
27: * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
28: * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
29: * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
30: * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
31: * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32: */
33:
34: #include <sys/param.h>
35: #include <sys/systm.h>
36: #include <sys/proc.h>
37: #include <sys/malloc.h>
38: #include <sys/vnode.h>
39: #include <sys/exec.h>
40: #include <sys/resourcevar.h>
41: #include <uvm/uvm_extern.h>
42: #include <sys/exec_elf.h>
43: #include <sys/exec_olf.h>
44:
45: #include <machine/freebsd_machdep.h>
46:
47: #include <compat/freebsd/freebsd_syscall.h>
48: #include <compat/freebsd/freebsd_exec.h>
49: #include <compat/freebsd/freebsd_util.h>
50:
51: extern struct sysent freebsd_sysent[];
52: #ifdef SYSCALL_DEBUG
53: extern char *freebsd_syscallnames[];
54: #endif
55:
56: extern const char freebsd_emul_path[];
57:
58: struct emul emul_freebsd_aout = {
59: "freebsd",
60: NULL,
61: freebsd_sendsig,
62: FREEBSD_SYS_syscall,
63: FREEBSD_SYS_MAXSYSCALL,
64: freebsd_sysent,
65: #ifdef SYSCALL_DEBUG
66: freebsd_syscallnames,
67: #else
68: NULL,
69: #endif
70: 0,
71: copyargs,
72: setregs,
73: NULL,
74: freebsd_sigcode,
75: freebsd_esigcode,
76: };
77:
78: struct emul emul_freebsd_elf = {
79: "freebsd",
80: NULL,
81: freebsd_sendsig,
82: FREEBSD_SYS_syscall,
83: FREEBSD_SYS_MAXSYSCALL,
84: freebsd_sysent,
85: #ifdef SYSCALL_DEBUG
86: freebsd_syscallnames,
87: #else
88: NULL,
89: #endif
90: FREEBSD_ELF_AUX_ARGSIZ,
91: elf32_copyargs,
92: setregs,
93: exec_elf32_fixup,
94: freebsd_sigcode,
95: freebsd_esigcode,
96: };
97:
98: /*
99: * exec_aout_makecmds(): Check if it's an a.out-format executable.
100: *
101: * Given a proc pointer and an exec package pointer, see if the referent
102: * of the epp is in a.out format. First check 'standard' magic numbers for
103: * this architecture. If that fails, try a cpu-dependent hook.
104: *
105: * This function, in the former case, or the hook, in the latter, is
106: * responsible for creating a set of vmcmds which can be used to build
107: * the process's vm space and inserting them into the exec package.
108: */
109:
110: int
111: exec_freebsd_aout_makecmds(p, epp)
112: struct proc *p;
113: struct exec_package *epp;
114: {
115: u_long midmag;
116: int error = ENOEXEC;
117: struct exec *execp = epp->ep_hdr;
118:
119: if (epp->ep_hdrvalid < sizeof(struct exec))
120: return ENOEXEC;
121:
122: midmag = FREEBSD_N_GETMID(*execp) << 16 | FREEBSD_N_GETMAGIC(*execp);
123:
124: /* assume FreeBSD's MID_MACHINE and [ZQNO]MAGIC is same as NetBSD's */
125: switch (midmag) {
126: case (MID_MACHINE << 16) | ZMAGIC:
127: error = exec_aout_prep_oldzmagic(p, epp);
128: break;
129: case (MID_MACHINE << 16) | QMAGIC:
130: error = exec_aout_prep_zmagic(p, epp);
131: break;
132: case (MID_MACHINE << 16) | NMAGIC:
133: error = exec_aout_prep_nmagic(p, epp);
134: break;
135: case (MID_MACHINE << 16) | OMAGIC:
136: error = exec_aout_prep_omagic(p, epp);
137: break;
138: }
139: if (error == 0)
140: epp->ep_emul = &emul_freebsd_aout;
141: else
142: kill_vmcmds(&epp->ep_vmcmds);
143:
144: return error;
145: }
146:
147: int
148: exec_freebsd_elf32_makecmds(struct proc *p, struct exec_package *epp)
149: {
150: if (!(emul_freebsd_elf.e_flags & EMUL_ENABLED))
151: return (ENOEXEC);
152: return exec_elf32_makecmds(p, epp);
153:
154: }
155:
156: int
157: freebsd_elf_probe(p, epp, itp, pos, os)
158: struct proc *p;
159: struct exec_package *epp;
160: char *itp;
161: u_long *pos;
162: u_int8_t *os;
163: {
164: Elf32_Ehdr *eh = epp->ep_hdr;
165: char *bp, *brand;
166: int error;
167: size_t len;
168:
169: /*
170: * Older FreeBSD ELF binaries use a brand; newer ones use EI_OSABI
171: */
172: if (eh->e_ident[EI_OSABI] != ELFOSABI_FREEBSD) {
173: brand = elf32_check_brand(eh);
174: if (brand == NULL || strcmp(brand, "FreeBSD") != 0)
175: return (EINVAL);
176: }
177: if (itp) {
178: if ((error = emul_find(p, NULL, freebsd_emul_path, itp, &bp, 0)))
179: return (error);
180: if ((error = copystr(bp, itp, MAXPATHLEN, &len)))
181: return (error);
182: free(bp, M_TEMP);
183: }
184: epp->ep_emul = &emul_freebsd_elf;
185: *pos = ELF32_NO_ADDR;
186: if (*os == OOS_NULL)
187: *os = OOS_FREEBSD;
188: return (0);
189: }
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