66 lines
1.6 KiB
C
66 lines
1.6 KiB
C
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//
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// This file is part of the µOS++ III distribution.
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// Copyright (c) 2014 Liviu Ionescu.
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//
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// ----------------------------------------------------------------------------
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#include <sys/types.h>
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#include <errno.h>
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// ----------------------------------------------------------------------------
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caddr_t
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_sbrk(int incr);
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// ----------------------------------------------------------------------------
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// The definitions used here should be kept in sync with the
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// stack definitions in the linker script.
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caddr_t
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_sbrk(int incr)
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{
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extern char _Heap_Begin; // Defined by the linker.
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extern char _Heap_Limit; // Defined by the linker.
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static char* current_heap_end;
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char* current_block_address;
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if (current_heap_end == 0)
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{
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current_heap_end = &_Heap_Begin;
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}
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current_block_address = current_heap_end;
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// Need to align heap to word boundary, else will get
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// hard faults on Cortex-M0. So we assume that heap starts on
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// word boundary, hence make sure we always add a multiple of
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// 4 to it.
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incr = (incr + 3) & (~3); // align value to 4
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if (current_heap_end + incr > &_Heap_Limit)
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{
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// Some of the libstdc++-v3 tests rely upon detecting
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// out of memory errors, so do not abort here.
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#if 0
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extern void abort (void);
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_write (1, "_sbrk: Heap and stack collision\n", 32);
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abort ();
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#else
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// Heap has overflowed
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errno = ENOMEM;
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return (caddr_t) - 1;
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#endif
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}
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current_heap_end += incr;
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return (caddr_t) current_block_address;
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}
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// ----------------------------------------------------------------------------
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