Last change
on this file since 652 was
444,
checked in by satin@…, 6 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
|
File size:
568 bytes
|
Rev | Line | |
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[444] | 1 | #include <_ansi.h> |
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| 2 | #include <sys/types.h> |
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| 3 | #include <sys/stat.h> |
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| 4 | #include "sys/syscall.h" |
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| 5 | |
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| 6 | caddr_t |
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| 7 | _sbrk (int incr) |
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| 8 | { |
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| 9 | extern char heap_start[]; /* Defined by the linker script. */ |
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| 10 | static char * heap_end = NULL; |
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| 11 | char * prev_heap_end; |
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| 12 | char * sp = (char *) & sp; |
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| 13 | |
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| 14 | if (heap_end == NULL) |
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| 15 | heap_end = heap_start; |
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| 16 | |
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| 17 | prev_heap_end = heap_end; |
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| 18 | |
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| 19 | if (heap_end + incr > sp) |
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| 20 | { |
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| 21 | #define MESSAGE "Heap and stack collision\n" |
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| 22 | _write (1, MESSAGE, sizeof MESSAGE); |
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| 23 | abort (); |
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| 24 | } |
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| 25 | |
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| 26 | heap_end += incr; |
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| 27 | |
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| 28 | return (caddr_t) prev_heap_end; |
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| 29 | } |
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