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 * 4. Neither the name of the University nor the names of its contributors 17 * may be used to endorse or promote products derived from this software 18 * without specific prior written permission. 19 * 20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30 * SUCH DAMAGE. 31 */ 32 33#if defined(SYSLIBC_SCCS) && !defined(lint) 34 .asciz "@(#)sbrk.s 5.1 (Berkeley) 4/23/90" 35#endif /* SYSLIBC_SCCS and not lint */ 36#include <machine/asm.h> 37__FBSDID("$FreeBSD$"); 38 39#include "SYS.h" 40 41 .globl CNAME(_end) 42 .globl HIDENAME(minbrk) 43 .globl HIDENAME(curbrk) 44 45 .data 46HIDENAME(minbrk): .quad CNAME(_end) 47HIDENAME(curbrk): .quad CNAME(_end) 48 .text 49 50ENTRY(sbrk) 51 pushq %rdi 52 movq %rdi,%rcx 53#ifdef PIC 54 movq PIC_GOT(HIDENAME(curbrk)),%rdx 55 movq (%rdx),%rax 56#else 57 movq HIDENAME(curbrk)(%rip),%rax 58#endif 59 testq %rcx,%rcx 60 jz back 61 addq %rax,%rdi 62 mov $SYS_break,%eax 63 KERNCALL 64 jb err 65#ifdef PIC 66 movq PIC_GOT(HIDENAME(curbrk)),%rdx 67 movq (%rdx),%rax 68#else 69 movq HIDENAME(curbrk)(%rip),%rax 70#endif 71 movq 0(%rsp), %rcx 72#ifdef PIC 73 addq %rcx,(%rdx) 74#else 75 addq %rcx,HIDENAME(curbrk)(%rip) 76#endif 77back: 78 addq $8, %rsp 79 ret 80err: 81 addq $8, %rsp 82 jmp HIDENAME(cerror) 83END(sbrk) 84 85 .section .note.GNU-stack,"",%progbits 86