projects / dragonfly.git / blame
| Commit | Line | Data |
|---|---|---|
| 17030342 MD |
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. | |
| 17030342 MD |
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 | * @(#)brk.s 5.2 (Berkeley) 12/17/90 | |
| eb9f4715 | 33 | * $FreeBSD: src/lib/libc/amd64/sys/brk.S,v 1.15 2008/11/02 01:10:54 peter Exp $ |
| 17030342 MD |
34 | */ |
| 35 | ||
| 36 | #include <machine/asm.h> | |
| 37 | ||
| 38 | #include "SYS.h" | |
| 39 | ||
| 40 | .globl HIDENAME(curbrk) | |
| 41 | .globl HIDENAME(minbrk) | |
| 42 | ENTRY(_brk) | |
| 43 | pushq %rdi | |
| 44 | jmp ok | |
| eb9f4715 | 45 | END(_brk) |
| 17030342 MD |
46 | |
| 47 | ENTRY(brk) | |
| 48 | pushq %rdi | |
| 49 | movq %rdi,%rax | |
| 50 | #ifdef PIC | |
| 51 | movq PIC_GOT(HIDENAME(minbrk)),%rdx | |
| 52 | cmpq %rax,(%rdx) | |
| 53 | #else | |
| 54 | cmpq %rax,HIDENAME(minbrk)(%rip) | |
| 55 | #endif | |
| 56 | jbe ok | |
| 57 | #ifdef PIC | |
| 58 | movq (%rdx),%rdi | |
| 59 | #else | |
| 60 | movq HIDENAME(minbrk)(%rip),%rdi | |
| 61 | #endif | |
| 62 | ok: | |
| 63 | movq $SYS_break,%rax | |
| 64 | KERNCALL | |
| 65 | jb err | |
| 66 | movq 0(%rsp),%rax | |
| 67 | #ifdef PIC | |
| 68 | movq PIC_GOT(HIDENAME(curbrk)),%rdx | |
| 69 | movq %rax,(%rdx) | |
| 70 | #else | |
| 71 | movq %rax,HIDENAME(curbrk)(%rip) | |
| 72 | #endif | |
| 73 | movq $0,%rax | |
| 74 | popq %rdi | |
| 75 | ret | |
| 76 | err: | |
| eb9f4715 | 77 | addq $8, %rsp |
| 17030342 MD |
78 | #ifdef PIC |
| 79 | movq PIC_GOT(HIDENAME(cerror)),%rdx | |
| 80 | jmp *%rdx | |
| 81 | #else | |
| 82 | jmp HIDENAME(cerror) | |
| 83 | #endif | |
| eb9f4715 | 84 | END(brk) |