summaryrefslogtreecommitdiff
path: root/libc/sysdeps/linux/h8300/brk.c
blob: 44c8674171df31797b9c30c387cc2b1e745f4020 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
/* brk on H8/300 by ysato */
/*
 * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
 *
 * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
 */

#include <errno.h>
#include <unistd.h>
#include <sys/syscall.h>

/* This must be initialized data because commons can't have aliases.  */
void *__curbrk attribute_hidden = 0;

/* libc_hidden_proto(brk) */
int brk (void *addr)
{
    void *newbrk;

    __asm__ ("mov.l %2,er1\n\t"
	 "mov.l %1,er0\n\t"
	 "trapa #0\n\t"
	 "mov.l er0,%0"
	 : "=r" (newbrk)
	 : "0" (__NR_brk), "g" (addr)
	 : "er0","er1");

    __curbrk = newbrk;

    if (newbrk < addr)
    {
	__set_errno (ENOMEM);
	return -1;
    }

    return 0;
}
libc_hidden_def(brk)