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15637ed4 RG |
1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * Redistribution and use in source and binary forms, with or without | |
6 | * modification, are permitted provided that the following conditions | |
7 | * are met: | |
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 the University of | |
16 | * California, Berkeley and its contributors. | |
17 | * 4. Neither the name of the University nor the names of its contributors | |
18 | * may be used to endorse or promote products derived from this software | |
19 | * without specific prior written permission. | |
20 | * | |
21 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
22 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
23 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
24 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
25 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
26 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
27 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
28 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
29 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
30 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
31 | * SUCH DAMAGE. | |
32 | */ | |
33 | ||
34 | #if defined(LIBC_SCCS) && !defined(lint) | |
35 | static char sccsid[] = "@(#)crt0.c 5.7 (Berkeley) 7/3/91"; | |
36 | #endif /* LIBC_SCCS and not lint */ | |
37 | ||
38 | ||
39 | /* | |
40 | * C start up routine. | |
41 | * Robert Henry, UCB, 20 Oct 81 | |
42 | * | |
43 | * We make the following (true) assumption: | |
44 | * 1) The only register variable that we can trust is the frame pointer, | |
45 | * ebp, which points to the base of the kernel calling frame. | |
46 | */ | |
47 | ||
48 | char **environ = (char **)0; | |
49 | int errno = 0; | |
50 | ||
51 | asm(".text"); | |
52 | asm(".long 0xc000c000"); | |
53 | ||
54 | extern unsigned char etext; | |
55 | extern unsigned char eprol asm ("eprol"); | |
56 | extern start() asm("start"); | |
57 | extern mcount() asm ("mcount"); | |
58 | ||
59 | start() | |
60 | { | |
61 | struct kframe { | |
62 | int kargc; | |
63 | char *kargv[1]; /* size depends on kargc */ | |
64 | char kargstr[1]; /* size varies */ | |
65 | char kenvstr[1]; /* size varies */ | |
66 | }; | |
67 | /* | |
68 | * ALL REGISTER VARIABLES!!! | |
69 | */ | |
70 | register struct kframe *kfp; | |
71 | register char **targv; | |
72 | register char **argv; | |
73 | extern void _mcleanup(); | |
74 | ||
75 | #ifdef lint | |
76 | kfp = 0; | |
77 | initcode = initcode = 0; | |
78 | #else not lint | |
79 | /* just above the saved frame pointer */ | |
80 | asm ("lea 4(%%ebp), %0" : "=r" (kfp) ); | |
81 | #endif not lint | |
82 | for (argv = targv = &kfp->kargv[0]; *targv++; /* void */) | |
83 | /* void */ ; | |
84 | if (targv >= (char **)(*argv)) | |
85 | --targv; | |
86 | environ = targv; | |
87 | asm("eprol:"); | |
88 | ||
89 | #ifdef MCRT0 | |
90 | atexit(_mcleanup); | |
91 | monstartup(&eprol, &etext); | |
92 | #endif MCRT0 | |
93 | exit(main(kfp->kargc, argv, environ)); | |
94 | } | |
95 | ||
96 | #ifdef CRT0 | |
97 | /* | |
98 | * null mcount and moncontrol, | |
99 | * just in case some routine is compiled for profiling | |
100 | */ | |
101 | moncontrol(val) | |
102 | int val; | |
103 | { | |
104 | ||
105 | } | |
106 | ||
107 | mcount() { } | |
108 | #endif CRT0 |