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Annotation of src/lib/libc/arch/x86_64/sys/sbrk.S, Revision 1.5

1.5     ! joerg       1: /*     $NetBSD: sbrk.S,v 1.4 2011/11/18 20:43:01 joerg 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)
1.5     ! joerg      39:        RCSID("$NetBSD: sbrk.S,v 1.4 2011/11/18 20:43:01 joerg 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)
1.5     ! joerg      56: #ifdef __PIC__
1.1       fvdl       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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