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50 lines
1.4 KiB
C
50 lines
1.4 KiB
C
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/* brk system call for Linux/ARM.
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Copyright (C) 1995, 1996 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <unistd.h>
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#include <sysdep.h>
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/* This must be initialized data because commons can't have aliases. */
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void *__curbrk = 0;
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int
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__brk (void *addr)
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{
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void *newbrk;
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asm ("mov a1, %1\n" /* save the argment in r0 */
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"swi %2\n" /* do the system call */
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"mov %0, a1;" /* keep the return value */
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: "=r"(newbrk)
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: "r"(addr), "i" (SYS_ify (brk))
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: "a1");
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__curbrk = newbrk;
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if (newbrk < addr)
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{
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__set_errno (ENOMEM);
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return -1;
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}
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return 0;
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}
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weak_alias (__brk, brk)
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