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FreeBSD/Linux Kernel Cross Reference
sys/amd64/sys/sbrk.S

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    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  * 4. Neither the name of the University nor the names of its contributors
   17  *    may be used to endorse or promote products derived from this software
   18  *    without specific prior written permission.
   19  *
   20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   30  * SUCH DAMAGE.
   31  */
   32 
   33 #if defined(SYSLIBC_SCCS) && !defined(lint)
   34         .asciz "@(#)sbrk.s      5.1 (Berkeley) 4/23/90"
   35 #endif /* SYSLIBC_SCCS and not lint */
   36 #include <machine/asm.h>
   37 __FBSDID("$FreeBSD: stable/7/lib/libc/amd64/sys/sbrk.S 184939 2008-11-13 20:46:07Z peter $");
   38 
   39 #include "SYS.h"
   40 
   41         .globl  CNAME(_end)
   42         .globl  HIDENAME(minbrk)
   43         .globl  HIDENAME(curbrk)
   44 
   45         .data
   46 HIDENAME(minbrk):       .quad   CNAME(_end)
   47 HIDENAME(curbrk):       .quad   CNAME(_end)
   48         .text
   49 
   50 ENTRY(sbrk)
   51         pushq   %rdi
   52         movq    %rdi,%rcx
   53 #ifdef PIC
   54         movq    PIC_GOT(HIDENAME(curbrk)),%rdx
   55         movq    (%rdx),%rax
   56 #else
   57         movq    HIDENAME(curbrk)(%rip),%rax
   58 #endif
   59         testq   %rcx,%rcx
   60         jz      back
   61         addq    %rax,%rdi
   62         mov     $SYS_break,%eax
   63         KERNCALL
   64         jb      err
   65 #ifdef PIC
   66         movq    PIC_GOT(HIDENAME(curbrk)),%rdx
   67         movq    (%rdx),%rax
   68 #else
   69         movq    HIDENAME(curbrk)(%rip),%rax
   70 #endif
   71         movq    0(%rsp), %rcx
   72 #ifdef PIC
   73         addq    %rcx,(%rdx)
   74 #else
   75         addq    %rcx,HIDENAME(curbrk)(%rip)
   76 #endif
   77 back:
   78         addq    $8, %rsp
   79         ret
   80 err:
   81         addq    $8, %rsp
   82 #ifdef PIC
   83         movq    PIC_GOT(HIDENAME(cerror)),%rdx
   84         jmp     *%rdx
   85 #else
   86         jmp     HIDENAME(cerror)
   87 #endif
   88 END(sbrk)

Cache object: 8dd293872efcfcc69b27b54f770f65ed


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