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

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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 * $Id: brk.S,v 1.1 1994/08/05 01:18:39 wollman Exp $
37 */
38
39#if defined(SYSLIBC_RCS) && !defined(lint)
40 .text
41 .asciz "$Id$"
42#endif /* SYSLIBC_RCS and not lint */
43
44#include "SYS.h"
45
46#define SYS_brk 17
47
48 .globl curbrk
49 .globl minbrk
50ENTRY(_brk)
51 jmp ok
52
53ENTRY(brk)
54#ifdef PIC
55 movl 4(%esp),%eax
56 PIC_PROLOGUE
57 movl PIC_GOT(curbrk),%edx # set up GOT addressing
58 movl PIC_GOT(minbrk),%ecx #
59 cmpl %eax,(%ecx)
60 PIC_EPILOGUE
61 jl ok
62 movl (%ecx),%eax
63 movl %eax,4(%esp)
64ok:
65 lea SYS_brk,%eax
66 LCALL(7,0)
67 jb err
68 movl 4(%esp),%eax
69 movl %eax,(%edx)
70 movl $0,%eax
71 ret
72err:
73 jmp PIC_PLT(cerror)
74
75#else
76
77 movl 4(%esp),%eax
78 cmpl %eax,minbrk
79 jl ok
80 movl minbrk,%eax
81 movl %eax,4(%esp)
82ok:
83 lea SYS_brk,%eax
84 LCALL(7,0)
85 jb err
86 movl 4(%esp),%eax
87 movl %eax,curbrk
88 movl $0,%eax
89 ret
90err:
91 jmp cerror
92#endif