glibc/ports/sysdeps/unix/sysv/linux/mips/brk.c

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/* brk system call for Linux/MIPS.
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Copyright (C) 2000, 2005, 2006 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
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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
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <unistd.h>
#include <sysdep.h>
void *__curbrk = 0;
/* Old braindamage in GCC's crtstuff.c requires this symbol in an attempt
to work around different old braindamage in the old Linux/x86 ELF
dynamic linker. Sigh. */
weak_alias (__curbrk, ___brk_addr)
int
__brk (void *addr)
{
void *newbrk;
{
register long int res __asm__ ("$2");
asm ("move\t$4,%2\n\t"
"li\t%0,%1\n\t"
"syscall" /* Perform the system call. */
: "=r" (res)
: "I" (SYS_ify (brk)), "r" (addr)
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: "$4", "$7", __SYSCALL_CLOBBERS);
newbrk = (void *) res;
}
__curbrk = newbrk;
if (newbrk < addr)
{
__set_errno (ENOMEM);
return -1;
}
return 0;
}
weak_alias (__brk, brk)