Annotation of src/lib/libc/arch/x86_64/sys/sbrk.S, Revision 1.4
1.4 ! joerg 1: /* $NetBSD: sbrk.S,v 1.3 2008/07/02 20:07:43 rmind Exp $ */
1.1 fvdl 2:
3: /*-
4: * Copyright (c) 1990 The Regents of the University of California.
5: * All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * William Jolitz.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
1.2 agc 18: * 3. Neither the name of the University nor the names of its contributors
1.1 fvdl 19: * may be used to endorse or promote products derived from this software
20: * without specific prior written permission.
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32: * SUCH DAMAGE.
33: *
34: * from: @(#)sbrk.s 5.1 (Berkeley) 4/23/90
35: */
36:
37: #include <machine/asm.h>
38: #if defined(SYSLIBC_SCCS) && !defined(lint)
1.4 ! joerg 39: RCSID("$NetBSD: sbrk.S,v 1.3 2008/07/02 20:07:43 rmind Exp $")
1.1 fvdl 40: #endif /* SYSLIBC_SCCS and not lint */
41:
42: #include "SYS.h"
43:
44: .globl _end
45: .globl CURBRK
46:
47: #ifdef WEAK_ALIAS
48: WEAK_ALIAS(sbrk, _sbrk)
49: #endif
50:
51: .data
52: CURBRK: .quad _end
53: .text
54:
55: ENTRY(_sbrk)
56: #ifdef PIC
57: movq PIC_GOT(CURBRK),%rdx
58: movq (%rdx),%rax
1.3 rmind 59: test %rdi,%rdi
60: jz out
1.1 fvdl 61: addq %rax,%rdi
62: SYSTRAP(break)
63: jc err
64: movq PIC_GOT(CURBRK),%rdx
65: movq (%rdx),%rax
66: movq %rdi,(%rdx)
1.3 rmind 67: out:
1.1 fvdl 68: ret
69: err:
1.4 ! joerg 70: jmp CERROR
1.1 fvdl 71: #else
72: movq CURBRK(%rip),%rax
1.3 rmind 73: test %rdi,%rdi
74: jz out
1.1 fvdl 75: movq %rdi,%rsi
76: addq %rax,%rdi
77: SYSTRAP(break)
78: jc err
79: movq CURBRK(%rip),%rax
80: addq %rsi,CURBRK(%rip)
1.3 rmind 81: out:
1.1 fvdl 82: ret
83: err:
84: jmp CERROR
85: #endif
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