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 --- 19 unchanged lines hidden (view full) --- 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: sbrk.S,v 1.3 1995/10/04 15:58:57 phk Exp $ |
37 */ 38 39#if defined(SYSLIBC_RCS) && !defined(lint) 40 .text |
41 .asciz "$Id: sbrk.S,v 1.3 1995/10/04 15:58:57 phk Exp $" |
42#endif /* SYSLIBC_RCS and not lint */ 43 44#include "SYS.h" 45 |
46 .globl CNAME(end) 47 .globl HIDENAME(minbrk) 48 .globl HIDENAME(curbrk) |
49 |
50 .data |
51HIDENAME(minbrk): .long CNAME(end) 52HIDENAME(curbrk): .long CNAME(end) |
53 .text 54 55ENTRY(sbrk) 56#ifdef PIC 57 movl 4(%esp),%ecx 58 PIC_PROLOGUE |
59 movl PIC_GOT(HIDENAME(curbrk)),%edx |
60 movl (%edx),%eax 61 PIC_EPILOGUE 62 testl %ecx,%ecx 63 jz back 64 addl %eax,4(%esp) |
65 lea SYS_break,%eax 66 KERNCALL |
67 jb err 68 PIC_PROLOGUE |
69 movl PIC_GOT(HIDENAME(curbrk)),%edx |
70 movl (%edx),%eax 71 addl %ecx,(%edx) 72 PIC_EPILOGUE 73back: 74 ret 75err: |
76 PIC_PROLOGUE 77 jmp PIC_PLT(HIDENAME(cerror)) |
78 79#else /* !PIC */ 80 81 movl 4(%esp),%ecx |
82 movl HIDENAME(curbrk),%eax |
83 testl %ecx,%ecx 84 jz back 85 addl %eax,4(%esp) |
86 lea SYS_break,%eax 87 KERNCALL |
88 jb err |
89 movl HIDENAME(curbrk),%eax 90 addl %ecx,HIDENAME(curbrk) |
91back: 92 ret 93err: |
94 jmp HIDENAME(cerror) |
95#endif /* PIC */ |