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6aac00e2 AS |
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 | * William Jolitz. | |
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 the University of | |
19 | * California, Berkeley and its contributors. | |
20 | * 4. Neither the name of the University nor the names of its contributors | |
21 | * may be used to endorse or promote products derived from this software | |
22 | * without specific prior written permission. | |
23 | * | |
24 | * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
25 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
26 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
27 | * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
28 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
29 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
30 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
31 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
32 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
33 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
34 | * SUCH DAMAGE. | |
35 | */ | |
36 | ||
37 | #if defined(SYSLIBC_SCCS) && !defined(lint) | |
38 | .asciz "@(#)brk.s 5.2 (Berkeley) 12/17/90" | |
39 | #endif /* SYSLIBC_SCCS and not lint */ | |
40 | ||
41 | #include "SYS.h" | |
42 | ||
43 | #define SYS_brk 17 | |
44 | ||
45 | .globl curbrk | |
46 | .globl minbrk | |
47 | ENTRY(_brk) | |
48 | jmp ok | |
49 | ||
50 | ENTRY(brk) | |
51 | #ifdef PIC | |
52 | movl 4(%esp),%eax | |
53 | PIC_PROLOGUE | |
54 | movl %edx,PIC_GOT(curbrk) # set up GOT addressing | |
55 | movl %ecx,PIC_GOT(minbrk) # | |
56 | cmpl %eax,(%ecx) | |
57 | PIC_EPILOGUE | |
58 | jl ok | |
59 | movl (%ecx),%eax | |
60 | movl %eax,4(%esp) | |
61 | ok: | |
62 | lea SYS_brk,%eax | |
63 | LCALL(7,0) | |
64 | jb err | |
65 | movl 4(%esp),%eax | |
66 | movl %eax,(%edx) | |
67 | movl $0,%eax | |
68 | ret | |
69 | err: | |
70 | jmp PIC_PLT(cerror) | |
71 | ||
72 | #else | |
73 | ||
74 | movl 4(%esp),%eax | |
75 | cmpl %eax,minbrk | |
76 | jl ok | |
77 | movl minbrk,%eax | |
78 | movl %eax,4(%esp) | |
79 | ok: | |
80 | lea SYS_brk,%eax | |
81 | LCALL(7,0) | |
82 | jb err | |
83 | movl 4(%esp),%eax | |
84 | movl %eax,curbrk | |
85 | movl $0,%eax | |
86 | ret | |
87 | err: | |
88 | jmp cerror | |
89 | #endif |