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Annotation of src/lib/libc/arch/i386/sys/sbrk.S, Revision 1.17

1.17    ! agc         1: /*     $NetBSD: sbrk.S,v 1.16 2002/03/20 22:06:18 ross Exp $   */
1.8       christos    2:
1.1       cgd         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.
1.17    ! agc        18:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        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.
1.2       jtc        33:  *
                     34:  *     from: @(#)sbrk.s        5.1 (Berkeley) 4/23/90
1.1       cgd        35:  */
                     36:
1.8       christos   37: #include <machine/asm.h>
1.1       cgd        38: #if defined(SYSLIBC_SCCS) && !defined(lint)
1.17    ! agc        39:        RCSID("$NetBSD: sbrk.S,v 1.16 2002/03/20 22:06:18 ross Exp $")
1.1       cgd        40: #endif /* SYSLIBC_SCCS and not lint */
                     41:
                     42: #include "SYS.h"
                     43:
                     44:        .globl  _end
1.9       kleink     45:        .globl  CURBRK
1.1       cgd        46:
1.14      kleink     47: #ifdef WEAK_ALIAS
                     48: WEAK_ALIAS(sbrk, _sbrk)
                     49: #endif
                     50:
1.1       cgd        51:        .data
1.9       kleink     52: CURBRK:        .long   _end
1.1       cgd        53:        .text
                     54:
1.13      kleink     55: ENTRY(_sbrk)
1.1       cgd        56: #ifdef PIC
                     57:        movl    4(%esp),%ecx
                     58:        PIC_PROLOGUE
1.9       kleink     59:        movl    PIC_GOT(CURBRK),%edx
1.5       mycroft    60:        PIC_EPILOGUE
1.1       cgd        61:        movl    (%edx),%eax
1.12      mycroft    62:        addl    %eax,%ecx
                     63:        movl    %ecx,4(%esp)
1.15      mycroft    64:        SYSTRAP(break)
1.5       mycroft    65:        jc      err
1.1       cgd        66:        PIC_PROLOGUE
1.9       kleink     67:        movl    PIC_GOT(CURBRK),%edx
1.5       mycroft    68:        PIC_EPILOGUE
1.1       cgd        69:        movl    (%edx),%eax
1.12      mycroft    70:        movl    %ecx,(%edx)
1.1       cgd        71:        ret
                     72: err:
1.10      christos   73:        PIC_PROLOGUE
1.12      mycroft    74:        mov     PIC_GOT(CERROR),%edx
1.11      mycroft    75:        PIC_EPILOGUE
1.16      ross       76:        jmp     *%edx
1.1       cgd        77: #else
                     78:        movl    4(%esp),%ecx
1.9       kleink     79:        movl    CURBRK,%eax
1.1       cgd        80:        addl    %eax,4(%esp)
1.15      mycroft    81:        SYSTRAP(break)
1.5       mycroft    82:        jc      err
1.9       kleink     83:        movl    CURBRK,%eax
                     84:        addl    %ecx,CURBRK
1.1       cgd        85:        ret
                     86: err:
1.9       kleink     87:        jmp     CERROR
1.1       cgd        88: #endif