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

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33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#if defined(SYSLIBC_SCCS) && !defined(lint)
38 .asciz "@(#)brk.s 5.2 (Berkeley) 12/17/90"
39#endif /* SYSLIBC_SCCS and not lint */
40#include <machine/asm.h>
41__FBSDID("$FreeBSD: head/lib/libc/amd64/sys/brk.S 114313 2003-04-30 18:16:33Z peter $");
42
43#include "SYS.h"
44
45 .globl HIDENAME(curbrk)
46 .globl HIDENAME(minbrk)
47ENTRY(_brk)
48 pushq %rdi
49 jmp ok
50
51ENTRY(brk)
52 pushq %rdi
53 movq %rdi,%rax
54 cmpq %rax,PIC_GOT(HIDENAME(minbrk))
55 jbe ok
56 movq PIC_GOT(HIDENAME(minbrk)),%rdi
57ok:
58 movq $SYS_break,%rax
59 KERNCALL
60 jb err
61 movq 0(%rsp),%rax
62 movq %rax,PIC_GOT(HIDENAME(curbrk))
63 movq $0,%rax
64 popq %rdi
65 ret
66err:
67 jmp PIC_PLT(HIDENAME(cerror))