diff options
Diffstat (limited to 'lib/libc/amd64/sys/brk.S')
| -rw-r--r-- | lib/libc/amd64/sys/brk.S | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/lib/libc/amd64/sys/brk.S b/lib/libc/amd64/sys/brk.S new file mode 100644 index 000000000000..4048ae60a890 --- /dev/null +++ b/lib/libc/amd64/sys/brk.S @@ -0,0 +1,82 @@ +/*- + * Copyright (c) 1990 The Regents of the University of California. + * All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * William Jolitz. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 4. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +#if defined(SYSLIBC_SCCS) && !defined(lint) + .asciz "@(#)brk.s 5.2 (Berkeley) 12/17/90" +#endif /* SYSLIBC_SCCS and not lint */ +#include <machine/asm.h> +__FBSDID("$FreeBSD$"); + +#include "SYS.h" + + .globl HIDENAME(curbrk) + .globl HIDENAME(minbrk) +ENTRY(_brk) + pushq %rdi + jmp ok +END(_brk) + +ENTRY(brk) + pushq %rdi + movq %rdi,%rax +#ifdef PIC + movq PIC_GOT(HIDENAME(minbrk)),%rdx + cmpq %rax,(%rdx) +#else + cmpq %rax,HIDENAME(minbrk)(%rip) +#endif + jbe ok +#ifdef PIC + movq (%rdx),%rdi +#else + movq HIDENAME(minbrk)(%rip),%rdi +#endif +ok: + movq $SYS_break,%rax + KERNCALL + jb err + movq 0(%rsp),%rax +#ifdef PIC + movq PIC_GOT(HIDENAME(curbrk)),%rdx + movq %rax,(%rdx) +#else + movq %rax,HIDENAME(curbrk)(%rip) +#endif + movq $0,%rax + popq %rdi + ret +err: + addq $8, %rsp + jmp HIDENAME(cerror) +END(brk) + + .section .note.GNU-stack,"",%progbits |