111 lines
3.1 KiB
C
111 lines
3.1 KiB
C
////////////////////////////////////////////////////////////////////////////////////////////////////////
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//
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// Name: sbrk.c
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// Created: January 2019
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// Author(s): Philip Smart
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// Description: System heap allocation for use when linking with the stdlib. This method is called
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// by the stdlib malloc to allocate a chunk of heap for it to use.
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//
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// Credits:
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// Copyright: modifications (c) 2019-2020 Philip Smart <philip.smart@net2net.org>
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//
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// History: January 2020 - Utilities assembled from various sources.
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//
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/////////////////////////////////////////////////////////////////////////////////////////////////////////
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// This source file is free software: you can redistribute it and#or modify
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// it under the terms of the GNU General Public License as published
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// by the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This source file is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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/////////////////////////////////////////////////////////////////////////////////////////////////////////
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#ifdef __cplusplus
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extern "C" {
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#endif
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#if defined(__K64F__)
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#define uint32_t __uint32_t
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#define uint16_t __uint16_t
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#define uint8_t __uint8_t
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#define int32_t __int32_t
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#define int16_t __int16_t
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#define int8_t __int8_t
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#elif defined(__ZPU__)
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#include <zstdio.h>
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#include <zpu-types.h>
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#include <stdlib.h>
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#else
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#error "Target CPU not defined, use __ZPU__ or __K64F__"
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#endif
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#include <errno.h>
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extern unsigned long _stext;
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extern unsigned long _etext;
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extern unsigned long _sdata;
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extern unsigned long _edata;
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extern unsigned long _sbss;
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extern unsigned long _ebss;
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extern unsigned long _estack;
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#ifndef STACK_MARGIN
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#define STACK_MARGIN 8192
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#endif
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//char *__brkval = (char *)&_ebss;
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//
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//void * _sbrk(int incr)
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//{
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// char *prev, *stack;
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//
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// prev = __brkval;
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// if (incr != 0) {
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// #if defined __K64F__
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// __asm__ volatile("mov %0, sp" : "=r" (stack) ::);
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// #endif
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// if (prev + incr >= stack - STACK_MARGIN) {
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//// errno = ENOMEM;
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// return (void *)-1;
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// }
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// __brkval = prev + incr;
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// }
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// return prev;
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//}
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extern char __HeapBase; /**< Defined by the linker */
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extern char __HeapLimit; /**< Defined by the linker */
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void * _sbrk(int incr)
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{
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static char *heap_end;
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char *prev_heap_end;
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if (heap_end == 0)
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{
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heap_end = &__HeapBase;
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}
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//xprintf("Head_end=%08lx, incr=%08lx\n", heap_end, incr);
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prev_heap_end = heap_end;
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if ((heap_end + incr) > (char*) &__HeapLimit)
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{
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//xprintf("Ovfl Head_end=%08lx, incr=%08lx\n", heap_end, incr);
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//errno = ENOMEM;
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return ((void*)-1); // error - no more memory
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}
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heap_end += incr;
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//xprintf("Head_end=%08lx, incr=%08lx\n", heap_end, incr);
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return prev_heap_end;
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}
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#ifdef __cplusplus
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}
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#endif
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