37 lines
1.2 KiB
C
37 lines
1.2 KiB
C
/* Copyright (c) 2013 Red Hat, Inc. All rights reserved.
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This copyrighted material is made available to anyone wishing to use, modify,
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copy, or redistribute it subject to the terms and conditions of the BSD
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License. This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY expressed or implied, including the implied warranties
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of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. A copy of this license
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is available at http://www.opensource.org/licenses. Any Red Hat trademarks that
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are incorporated in the source code or documentation are not subject to the BSD
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License and may only be used or replicated with the express permission of
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Red Hat, Inc.
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*/
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int write (int fd, const char *buf, int len);
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void abort (void);
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char *
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_sbrk (int adj)
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{
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extern char end[]; /* Defined in the linker script. */
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static char * heap = end;
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char * rv = heap;
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char * sp = (char *) & sp; /* Stack grows down, heap grows up... */
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if (heap + adj > sp)
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{
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const char msg[] = "Heap and stack collision\n";
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write (1, msg, sizeof (msg) - 1);
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abort ();
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}
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heap += adj;
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return rv;
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}
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char * sbrk (int) __attribute__((weak, alias ("_sbrk")));
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