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/*
* Copyright (C) 2016 Andes Technology, Inc.
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
/* brk system call for Linux/NDS32.
Copyright (C) 1995, 1996 Free Software Foundation, Inc.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, write to the Free
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307 USA. */
#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;
#ifdef NDS32_ABI_V0
__asm__ __volatile__ ("move $r0, %1 \n\t" // save the argment in r0
"pushm $r7, $r8 \n\t"
"sethi $r7, hi20(%2)\n\t" // put the syscall number in r7
"ori $r7, $r7, lo12(%2)\n\t"
"syscall 0x7fff \n\t" // do the system call
"popm $r7, $r8 \n\t"
"move %0, $r5 \n\t" // keep the return value
: "=r"(newbrk)
: "r"(addr), "i"(SYS_ify(brk))
: "$r0", "$r5");
#else
__asm__ __volatile__ ("move $r0, %1 \n\t" // save the argment in r0
"syscall %2 \n\t" // do the system call
"move %0, $r0 \n\t" // keep the return value
: "=r"(newbrk)
: "r"(addr), "i"(SYS_ify(brk))
: "$r0");
#endif
__curbrk = newbrk;
if (newbrk < addr)
{
__set_errno (ENOMEM);
return -1;
}
return 0;
}
libc_hidden_def(brk)
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