projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 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. | |
| 31eef5b4 RG |
35 | * |
| 36 | * $Id$ | |
| 6aac00e2 AS |
37 | */ |
| 38 | ||
| 39 | #if defined(SYSLIBC_SCCS) && !defined(lint) | |
| 40 | .asciz "@(#)brk.s 5.2 (Berkeley) 12/17/90" | |
| 41 | #endif /* SYSLIBC_SCCS and not lint */ | |
| 42 | ||
| 43 | #include "SYS.h" | |
| 44 | ||
| 45 | #define SYS_brk 17 | |
| 46 | ||
| 47 | .globl curbrk | |
| 48 | .globl minbrk | |
| 49 | ENTRY(_brk) | |
| 50 | jmp ok | |
| 51 | ||
| 52 | ENTRY(brk) | |
| 53 | #ifdef PIC | |
| 31eef5b4 RG |
54 | movl 4(%esp),%eax |
| 55 | PIC_PROLOGUE | |
| a9bbfcb2 RG |
56 | movl PIC_GOT(curbrk),%edx # set up GOT addressing |
| 57 | movl PIC_GOT(minbrk),%ecx # | |
| 31eef5b4 RG |
58 | cmpl %eax,(%ecx) |
| 59 | PIC_EPILOGUE | |
| 60 | jl ok | |
| 61 | movl (%ecx),%eax | |
| 62 | movl %eax,4(%esp) | |
| 6aac00e2 | 63 | ok: |
| 31eef5b4 RG |
64 | lea SYS_brk,%eax |
| 65 | LCALL(7,0) | |
| 66 | jb err | |
| 67 | movl 4(%esp),%eax | |
| 68 | movl %eax,(%edx) | |
| 69 | movl $0,%eax | |
| 70 | ret | |
| 6aac00e2 | 71 | err: |
| 31eef5b4 | 72 | jmp PIC_PLT(cerror) |
| 6aac00e2 AS |
73 | |
| 74 | #else | |
| 75 | ||
| 76 | movl 4(%esp),%eax | |
| 77 | cmpl %eax,minbrk | |
| 78 | jl ok | |
| 79 | movl minbrk,%eax | |
| 80 | movl %eax,4(%esp) | |
| 81 | ok: | |
| 82 | lea SYS_brk,%eax | |
| 83 | LCALL(7,0) | |
| 84 | jb err | |
| 85 | movl 4(%esp),%eax | |
| 86 | movl %eax,curbrk | |
| 87 | movl $0,%eax | |
| 88 | ret | |
| 89 | err: | |
| 90 | jmp cerror | |
| 91 | #endif |