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Annotation of src/lib/libc/arch/i386/sys/sbrk.S, Revision 1.2

1.1       cgd         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:  * 3. All advertising materials mentioning features or use of this software
                     17:  *    must display the following acknowledgement:
                     18:  *     This product includes software developed by the University of
                     19:  *     California, Berkeley and its contributors.
                     20:  * 4. Neither the name of the University nor the names of its contributors
                     21:  *    may be used to endorse or promote products derived from this software
                     22:  *    without specific prior written permission.
                     23:  *
                     24:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     25:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     26:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     27:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     28:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     29:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     30:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     31:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     32:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     33:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     34:  * SUCH DAMAGE.
1.2     ! jtc        35:  *
        !            36:  *     from: @(#)sbrk.s        5.1 (Berkeley) 4/23/90
        !            37:  *     $Id: $
1.1       cgd        38:  */
                     39:
                     40: #if defined(SYSLIBC_SCCS) && !defined(lint)
                     41:        .text
1.2     ! jtc        42:        .asciz "$Id: sbrk.s,v 1.1 1993/10/07 00:19:51 cgd Exp $"
1.1       cgd        43: #endif /* SYSLIBC_SCCS and not lint */
                     44:
                     45: #include "SYS.h"
                     46:
                     47: #define        SYS_brk         17
                     48:
                     49:        .globl  _end
                     50:        .globl  minbrk
                     51:        .globl  curbrk
                     52:
                     53:        .data
                     54: minbrk:        .long   _end
                     55: curbrk:        .long   _end
                     56:        .text
                     57:
                     58: ENTRY(sbrk)
                     59: #ifdef PIC
                     60:        movl    4(%esp),%ecx
                     61:        PIC_PROLOGUE
                     62:        movl    PIC_GOT(curbrk),%edx
                     63:        movl    (%edx),%eax
                     64:        PIC_EPILOGUE
                     65:        addl    %eax,4(%esp)
                     66:        lea     SYS_brk,%eax
                     67:        LCALL(7,0)
                     68:        jb      err
                     69:        PIC_PROLOGUE
                     70:        movl    PIC_GOT(curbrk),%edx
                     71:        movl    (%edx),%eax
                     72:        addl    %ecx,(%edx)
                     73:        PIC_EPILOGUE
                     74:        ret
                     75: err:
                     76:        jmp     PIC_PLT(cerror)
                     77:
                     78: #else
                     79:
                     80:        movl    4(%esp),%ecx
                     81:        movl    curbrk,%eax
                     82:        addl    %eax,4(%esp)
                     83:        lea     SYS_brk,%eax
                     84:        LCALL(7,0)
                     85:        jb      err
                     86:        movl    curbrk,%eax
                     87:        addl    %ecx,curbrk
                     88:        ret
                     89: err:
                     90:        jmp     cerror
                     91: #endif