| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, |
| * software distributed under the License is distributed on an |
| * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY |
| * KIND, either express or implied. See the License for the |
| * specific language governing permissions and limitations |
| * under the License. |
| */ |
| |
| #include <sys/mman.h> |
| #include <unistd.h> |
| |
| #include <hal/hal_bsp.h> |
| |
| extern int getpagesize(void); |
| |
| static void *cont; |
| static int sys_pagesize; |
| static int cont_left; |
| |
| void * |
| _sbrk(int incr) |
| { |
| void *result; |
| |
| if (!sys_pagesize) { |
| sys_pagesize = getpagesize(); |
| } |
| if (cont && incr <= cont_left) { |
| result = cont; |
| cont_left -= incr; |
| if (cont_left) { |
| cont = (char *)cont + incr; |
| } else { |
| cont = NULL; |
| } |
| return result; |
| } |
| result = mmap(NULL, incr, PROT_READ | PROT_WRITE, MAP_ANON | MAP_SHARED, |
| -1, 0); |
| if (result) { |
| cont_left = sys_pagesize - (incr % sys_pagesize); |
| if (cont_left) { |
| cont = (char *)result + incr; |
| } else { |
| cont = NULL; |
| } |
| } |
| return result; |
| } |