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 1.2 1995/01/23 01:29:39 davidg Exp $
37 */
38
39#if defined(SYSLIBC_RCS) && !defined(lint)
40 .text
41 .asciz "$Id: brk.S,v 1.2 1995/01/23 01:29:39 davidg Exp $"
42#endif /* SYSLIBC_RCS and not lint */
43
44#include "SYS.h"
45
46 .globl HIDENAME(curbrk)
47 .globl HIDENAME(minbrk)
48ENTRY(_brk)
49 jmp ok
50
51ENTRY(brk)
52#ifdef PIC
53 movl 4(%esp),%eax
54 PIC_PROLOGUE
55 movl PIC_GOT(HIDENAME(curbrk)),%edx # set up GOT addressing
56 movl PIC_GOT(HIDENAME(minbrk)),%ecx #
57 cmpl %eax,(%ecx)
58 PIC_EPILOGUE
59 jl ok
60 movl (%ecx),%eax
61 movl %eax,4(%esp)
62ok:
63 lea SYS_break,%eax
64 KERNCALL
65 jb err
66 movl 4(%esp),%eax
67 movl %eax,(%edx)
68 movl $0,%eax
69 ret
70err:
71 PIC_PROLOGUE
72 jmp PIC_PLT(HIDENAME(cerror))
73
74#else
75
76 movl 4(%esp),%eax
77 cmpl %eax,HIDENAME(minbrk)
78 jl ok
79 movl HIDENAME(minbrk),%eax
80 movl %eax,4(%esp)
81ok:
82 lea SYS_break,%eax
83 KERNCALL
84 jb err
85 movl 4(%esp),%eax
86 movl %eax,HIDENAME(curbrk)
87 movl $0,%eax
88 ret
89err:
90 jmp HIDENAME(cerror)
91#endif