75 lines
1.7 KiB
C
75 lines
1.7 KiB
C
/* pseudo system calls for M68HC11 & M68HC12.
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* Copyright (C) 1999, 2000, 2001, 2002 Stephane Carrez (stcarrez@nerim.fr)
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*
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* The authors hereby grant permission to use, copy, modify, distribute,
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* and license this software and its documentation for any purpose, provided
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* that existing copyright notices are retained in all copies and that this
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* notice is included verbatim in any distributions. No written agreement,
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* license, or royalty fee is required for any of the authorized uses.
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* Modifications to this software may be copyrighted by their authors
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* and need not follow the licensing terms described here, provided that
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* the new terms are clearly indicated on the first page of each file where
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* they apply.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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extern void outbyte(char c);
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extern char inbyte(void);
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int
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read(int file, void *p, size_t nbytes)
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{
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int i = 0;
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char* buf = (char*) p;
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for (i = 0; i < nbytes; i++) {
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*(buf + i) = inbyte();
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if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {
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i++;
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break;
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}
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}
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return (i);
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}
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int
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write(int file, const void *p, size_t len)
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{
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const char *ptr = (const char*) p;
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int todo;
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for (todo = len; todo; --todo)
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{
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outbyte (*ptr++);
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}
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return(len);
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}
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void *
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sbrk(size_t incr)
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{
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extern char _end; /* Defined by the linker */
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static char *heap_end;
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char *prev_heap_end;
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register char *stack_ptr asm ("sp");
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if (heap_end == 0)
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{
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heap_end = &_end;
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}
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prev_heap_end = heap_end;
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if (heap_end + incr > stack_ptr)
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{
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write (1, "Heap and stack collision\n", 25);
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abort ();
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}
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heap_end += incr;
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return ((void*) prev_heap_end);
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}
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/* end of syscalls.c */
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