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1 | /*- |
2 | * Copyright (c) 1990 The Regents of the University of California. | |
3 | * All rights reserved. | |
4 | * | |
5 | * This code is derived from software contributed to Berkeley by | |
6 | * the Systems Programming Group of the University of Utah Computer | |
7 | * Science Department. | |
8 | * | |
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9 | * Redistribution and use in source and binary forms, with or without |
10 | * modification, are permitted provided that the following conditions | |
11 | * are met: | |
12 | * 1. Redistributions of source code must retain the above copyright | |
13 | * notice, this list of conditions and the following disclaimer. | |
14 | * 2. Redistributions in binary form must reproduce the above copyright | |
15 | * notice, this list of conditions and the following disclaimer in the | |
16 | * documentation and/or other materials provided with the distribution. | |
17 | * 3. All advertising materials mentioning features or use of this software | |
18 | * must display the following acknowledgement: | |
19 | * This product includes software developed by the University of | |
20 | * California, Berkeley and its contributors. | |
21 | * 4. Neither the name of the University nor the names of its contributors | |
22 | * may be used to endorse or promote products derived from this software | |
23 | * without specific prior written permission. | |
24 | * | |
25 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
26 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
27 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
28 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
29 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
30 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
31 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
32 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
33 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
34 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
35 | * SUCH DAMAGE. | |
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36 | */ |
37 | ||
38 | #if defined(LIBC_SCCS) && !defined(lint) | |
1c15e888 | 39 | .asciz "@(#)brk.s 5.1 (Berkeley) 5/12/90" |
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40 | #endif /* LIBC_SCCS and not lint */ |
41 | ||
42 | #include "SYS.h" | |
43 | ||
44 | #define SYS_brk 17 | |
45 | ||
46 | .globl curbrk | |
47 | .globl minbrk | |
48 | ENTRY(brk) | |
49 | movl minbrk,d0 | |
50 | cmpl sp@(4),d0 | |
51 | jle ok | |
52 | movl d0,sp@(4) | |
53 | ok: | |
54 | movl #SYS_brk,d0 | |
55 | trap #0 | |
56 | jcs err | |
57 | movl sp@(4),curbrk | |
58 | clrl d0 | |
59 | rts | |
60 | err: | |
61 | jmp cerror |