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Last change
on this file since 509 was
444,
checked in by satin@…, 7 years ago
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add newlib,libalmos-mkh, restructure shared_syscalls.h and mini-libc
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File size:
795 bytes
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| Rev | Line | |
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| [444] | 1 | #include <sys/types.h> |
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| 2 | #include <sys/stat.h> |
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| 3 | #include "syscall.h" |
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| 4 | #include "eit.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 | /* `_end' is defined in the linker script. |
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| 10 | We must handle it carefully as we don't want the compiler to think |
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| 11 | it lives in the small data area. Use medium model to ensure 32 bit |
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| 12 | addressability. */ |
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| 13 | extern char _end __attribute__ ((__model__(__medium__))); |
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| 14 | static char *heap_end; |
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| 15 | char *prev_heap_end; |
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| 16 | char *sp = (char *)&sp; |
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| 17 | |
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| 18 | if (heap_end == 0) |
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| 19 | { |
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| 20 | heap_end = &_end; |
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| 21 | } |
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| 22 | prev_heap_end = heap_end; |
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| 23 | if (heap_end > sp) |
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| 24 | { |
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| 25 | _write (1, "Heap and stack collision\n", 25); |
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| 26 | #if 0 /* Calling abort brings in the signal handling code. */ |
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| 27 | abort (); |
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| 28 | #else |
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| 29 | exit (1); |
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| 30 | #endif |
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| 31 | } |
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| 32 | heap_end += incr; |
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| 33 | return (caddr_t) prev_heap_end; |
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| 34 | } |
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