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/* sbrk for MMIXware.
Copyright (C) 2001 Hans-Peter Nilsson.
Permission to use, copy, modify, and distribute this software is freely
granted, provided that this notice is preserved with no changes.
THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. */
#include <_ansi.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "sys/syscall.h"
extern char *_Sbrk_high;
/* When the program is loaded, the first location in Pool_Segment holds
the first available octabyte in the memory pool (a.k.a. the heap);
somewhere after the command-line parameters. We don't have to
initialize that location, we can just use it straight up as a pointer;
just point the symbol there.
This file will be compiled with -no-builtin-syms, so we need to define
Pool_Segment and any other symbols that would be predefined in mmixal. */
__asm__ (" .global _Sbrk_high\n"
"_Sbrk_high IS Pool_Segment\n"
"Pool_Segment IS 0x40<<56");
caddr_t
_sbrk (size_t incr)
{
extern char end; /* Defined by the linker */
char *prev_heap_end;
prev_heap_end = _Sbrk_high;
_Sbrk_high += incr;
return (caddr_t) prev_heap_end;
}
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