Annotation of sys/lib/libsa/exec.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: exec.c,v 1.26 2003/08/11 06:23:09 deraadt Exp $ */
2: /* $NetBSD: exec.c,v 1.15 1996/10/13 02:29:01 christos Exp $ */
3:
4: /*-
5: * Copyright (c) 1982, 1986, 1990, 1993
6: * The Regents of the University of California. 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. Neither the name of the University nor the names of its contributors
17: * may be used to endorse or promote products derived from this software
18: * without specific prior written permission.
19: *
20: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30: * SUCH DAMAGE.
31: */
32:
33: #include <sys/param.h>
34: #include <sys/exec.h>
35: #include <sys/reboot.h>
36: #ifndef INSECURE
37: #include <sys/stat.h>
38: #endif
39:
40: #include "stand.h"
41:
42: static char *ssym, *esym;
43:
44: extern u_int opendev;
45:
46: void
47: exec(char *path, void *loadaddr, int howto)
48: {
49: int io;
50: #ifndef INSECURE
51: struct stat sb;
52: #endif
53: struct exec x;
54: u_int i;
55: ssize_t sz;
56: char *addr;
57: #ifdef EXEC_DEBUG
58: char *daddr, *etxt;
59: #endif
60:
61: io = open(path, 0);
62: if (io < 0)
63: return;
64:
65: (void) fstat(io, &sb);
66: if (sb.st_mode & 2)
67: printf("non-secure file, check permissions!\n");
68:
69: sz = read(io, (char *)&x, sizeof(x));
70: if (sz != sizeof(x) || N_BADMAG(x)) {
71: close(io);
72: errno = EFTYPE;
73: return;
74: }
75:
76: #ifdef EXEC_DEBUG
77: printf("\nstruct exec {%x, %x, %x, %x, %x, %x, %x, %x}\n",
78: x.a_midmag, x.a_text, x.a_data, x.a_bss, x.a_syms,
79: x.a_entry, x.a_trsize, x.a_drsize);
80: #endif
81:
82: /* Text */
83: printf("%u", x.a_text);
84: addr = loadaddr;
85: sz = x.a_text;
86: if (N_GETMAGIC(x) == ZMAGIC) {
87: bcopy((char *)&x, addr, sizeof x);
88: addr += sizeof x;
89: sz -= sizeof x;
90: }
91: if (read(io, (char *)addr, sz) != sz)
92: goto shread;
93: addr += sz;
94: #ifdef EXEC_DEBUG
95: printf("\ntext {%x, %x, %x, %x}\n",
96: addr[0], addr[1], addr[2], addr[3]);
97: etxt = addr;
98: #endif
99: if (N_GETMAGIC(x) == NMAGIC)
100: while ((long)addr & (N_PAGSIZ(x) - 1))
101: *addr++ = 0;
102:
103: /* Data */
104: #ifdef EXEC_DEBUG
105: daddr = addr;
106: #endif
107: printf("+%u", x.a_data);
108: if (read(io, addr, x.a_data) != (ssize_t)x.a_data)
109: goto shread;
110: addr += x.a_data;
111:
112: /* Bss */
113: printf("+%u", x.a_bss);
114: for (i = 0; i < x.a_bss; i++)
115: *addr++ = 0;
116:
117: /* Symbols */
118: if (x.a_syms) {
119: ssym = addr;
120: bcopy(&x.a_syms, addr, sizeof(x.a_syms));
121: addr += sizeof(x.a_syms);
122: printf("+[%u", x.a_syms);
123: if (read(io, addr, x.a_syms) != (ssize_t)x.a_syms)
124: goto shread;
125: addr += x.a_syms;
126:
127: if (read(io, &i, sizeof(u_int)) != sizeof(u_int))
128: goto shread;
129:
130: bcopy(&i, addr, sizeof(u_int));
131: if (i) {
132: sz = i - sizeof(int);
133: addr += sizeof(int);
134: if (read(io, addr, sz) != sz)
135: goto shread;
136: addr += sz;
137: }
138:
139: /* and that many bytes of string table */
140: printf("+%d]", sz);
141: esym = addr;
142: } else {
143: ssym = 0;
144: esym = 0;
145: }
146:
147: close(io);
148:
149: /* and note the end address of all this */
150: printf(" total=0x%lx", (u_long)addr);
151:
152: /* XXX - Hack alert!
153: This is no good, loadaddr is passed into
154: machdep_start(), and it should do whatever
155: is needed.
156:
157: x.a_entry += (long)loadaddr;
158: */
159: printf(" start=0x%x\n", x.a_entry);
160:
161: #ifdef EXEC_DEBUG
162: printf("loadaddr=%p etxt=%p daddr=%p ssym=%p esym=%p\n",
163: loadaddr, etxt, daddr, ssym, esym);
164: printf("\n\nReturn to boot...\n");
165: getchar();
166: #endif
167:
168: machdep_start((char *)((register_t)x.a_entry), howto, loadaddr, ssym,
169: esym);
170:
171: /* exec failed */
172: errno = ENOEXEC;
173: return;
174:
175: shread:
176: close(io);
177: errno = EIO;
178: return;
179: }
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