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Annotation of src/lib/libc/arch/x86_64/sys/brk.S, Revision 1.4

1.4     ! joerg       1: /*     $NetBSD: brk.S,v 1.3 2003/08/07 16:42:37 agc 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.
1.3       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: @(#)brk.s 5.2 (Berkeley) 12/17/90
                     35:  */
                     36:
                     37: #include <machine/asm.h>
                     38: #if defined(SYSLIBC_SCCS) && !defined(lint)
1.4     ! joerg      39:        RCSID("$NetBSD: brk.S,v 1.3 2003/08/07 16:42:37 agc Exp $")
1.1       fvdl       40: #endif /* SYSLIBC_SCCS and not lint */
                     41:
                     42: #include "SYS.h"
                     43:
                     44:        .globl  _end
                     45:        .globl  _C_LABEL(__minbrk)
                     46:        .globl  CURBRK
                     47:
                     48: #ifdef WEAK_ALIAS
                     49: WEAK_ALIAS(brk, _brk)
                     50: #endif
                     51:
                     52:        .data
                     53: _C_LABEL(__minbrk):
                     54:        .quad   _end
                     55:        .text
                     56:
                     57: ENTRY(_brk)
                     58: #ifdef PIC
                     59:        movq    PIC_GOT(_C_LABEL(__minbrk)),%rdx
                     60:        cmpq    %rdi,(%rdx)
                     61:        jb      1f
                     62:        movq    (%rdx),%rdi
                     63: 1:
                     64:        SYSTRAP(break)
                     65:        jc      err
                     66:        movq    PIC_GOT(CURBRK),%rdx    # set up GOT addressing
1.2       fvdl       67:        movq    %rdi,(%rdx)
1.1       fvdl       68:        xorl    %eax,%eax
                     69:        ret
                     70: err:
1.4     ! joerg      71:        jmp     CERROR
1.1       fvdl       72: #else
                     73:        cmpq    %rdi,_C_LABEL(__minbrk)(%rip)
                     74:        jb      1f
                     75:        movq    _C_LABEL(__minbrk)(%rip),%rdi
                     76: 1:
                     77:        SYSTRAP(break)
                     78:        jc      err
                     79:        movq    %rdi,CURBRK(%rip)
                     80:        xorl    %eax,%eax
                     81:        ret
                     82: err:
                     83:        jmp     CERROR
                     84: #endif