/**************************************************************************** * mm/mm_heap/mm_malloc.c * * 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. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include "mm_heap/mm.h" #include "kasan/kasan.h" /**************************************************************************** * Private Functions ****************************************************************************/ static void free_delaylist(FAR struct mm_heap_s *heap) { #if defined(CONFIG_BUILD_FLAT) || defined(__KERNEL__) FAR struct mm_delaynode_s *tmp; irqstate_t flags; /* Move the delay list to local */ flags = enter_critical_section(); tmp = heap->mm_delaylist[up_cpu_index()]; heap->mm_delaylist[up_cpu_index()] = NULL; leave_critical_section(flags); /* Test if the delayed is empty */ while (tmp) { FAR void *address; /* Get the first delayed deallocation */ address = tmp; tmp = tmp->flink; /* The address should always be non-NULL since that was checked in the * 'while' condition above. */ mm_free(heap, address); } #endif } #if CONFIG_MM_BACKTRACE >= 0 void mm_dump_handler(FAR struct tcb_s *tcb, FAR void *arg) { struct mallinfo_task info; info.pid = tcb->pid; mm_mallinfo_task(arg, &info); mwarn("pid:%5d, used:%10d, nused:%10d\n", tcb->pid, info.uordblks, info.aordblks); } #endif /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: mm_malloc * * Description: * Find the smallest chunk that satisfies the request. Take the memory from * that chunk, save the remaining, smaller chunk (if any). * * 8-byte alignment of the allocated data is assured. * ****************************************************************************/ FAR void *mm_malloc(FAR struct mm_heap_s *heap, size_t size) { FAR struct mm_freenode_s *node; size_t alignsize; size_t nodesize; FAR void *ret = NULL; int ndx; /* Free the delay list first */ free_delaylist(heap); /* Ignore zero-length allocations */ if (size < 1) { return NULL; } #if CONFIG_MM_HEAP_MEMPOOL_THRESHOLD != 0 ret = mempool_multiple_alloc(heap->mm_mpool, size); if (ret != NULL) { return ret; } #endif /* Adjust the size to account for (1) the size of the allocated node and * (2) to make sure that it is aligned with MM_ALIGN and its size is at * least MM_MIN_CHUNK. */ if (size < MM_MIN_CHUNK - OVERHEAD_MM_ALLOCNODE) { size = MM_MIN_CHUNK - OVERHEAD_MM_ALLOCNODE; } alignsize = MM_ALIGN_UP(size + OVERHEAD_MM_ALLOCNODE); if (alignsize < size) { /* There must have been an integer overflow */ return NULL; } DEBUGASSERT(alignsize >= MM_ALIGN); /* We need to hold the MM mutex while we muck with the nodelist. */ DEBUGVERIFY(mm_lock(heap)); /* Convert the request size into a nodelist index */ ndx = mm_size2ndx(alignsize); /* Search for a large enough chunk in the list of nodes. This list is * ordered by size, but will have occasional zero sized nodes as we visit * other mm_nodelist[] entries. */ for (node = heap->mm_nodelist[ndx].flink; node; node = node->flink) { DEBUGASSERT(node->blink->flink == node); nodesize = SIZEOF_MM_NODE(node); if (nodesize >= alignsize) { break; } } /* If we found a node with non-zero size, then this is one to use. Since * the list is ordered, we know that it must be the best fitting chunk * available. */ if (node) { FAR struct mm_freenode_s *remainder; FAR struct mm_freenode_s *next; size_t remaining; /* Remove the node. There must be a predecessor, but there may not be * a successor node. */ DEBUGASSERT(node->blink); node->blink->flink = node->flink; if (node->flink) { node->flink->blink = node->blink; } /* Get a pointer to the next node in physical memory */ next = (FAR struct mm_freenode_s *)(((FAR char *)node) + nodesize); DEBUGASSERT((next->size & MM_ALLOC_BIT) != 0 && (next->size & MM_PREVFREE_BIT) != 0 && next->preceding == nodesize); /* Check if we have to split the free node into one of the allocated * size and another smaller freenode. In some cases, the remaining * bytes can be smaller (they may be SIZEOF_MM_ALLOCNODE). In that * case, we will just carry the few wasted bytes at the end of the * allocation. */ remaining = nodesize - alignsize; if (remaining >= MM_MIN_CHUNK) { /* Create the remainder node */ remainder = (FAR struct mm_freenode_s *) (((FAR char *)node) + alignsize); remainder->size = remaining; /* Adjust the size of the node under consideration */ node->size = alignsize | (node->size & MM_MASK_BIT); /* Adjust the 'preceding' size of the (old) next node. */ next->preceding = remaining; /* Add the remainder back into the nodelist */ mm_addfreechunk(heap, remainder); } else { /* Previous physical memory node is alloced, so clear the previous * free bit in next->size. */ next->size &= ~MM_PREVFREE_BIT; } /* Handle the case of an exact size match */ node->size |= MM_ALLOC_BIT; ret = (FAR void *)((FAR char *)node + SIZEOF_MM_ALLOCNODE); } DEBUGASSERT(ret == NULL || mm_heapmember(heap, ret)); mm_unlock(heap); if (ret) { MM_ADD_BACKTRACE(heap, node); kasan_unpoison(ret, mm_malloc_size(heap, ret)); #ifdef CONFIG_MM_FILL_ALLOCATIONS memset(ret, 0xaa, alignsize - OVERHEAD_MM_ALLOCNODE); #endif #ifdef CONFIG_DEBUG_MM minfo("Allocated %p, size %zu\n", ret, alignsize); #endif } #ifdef CONFIG_DEBUG_MM else { #ifdef CONFIG_MM_DUMP_ON_FAILURE struct mallinfo minfo; #endif mwarn("WARNING: Allocation failed, size %zu\n", alignsize); #ifdef CONFIG_MM_DUMP_ON_FAILURE mm_mallinfo(heap, &minfo); mwarn("Total:%d, used:%d, free:%d, largest:%d, nused:%d, nfree:%d\n", minfo.arena, minfo.uordblks, minfo.fordblks, minfo.mxordblk, minfo.aordblks, minfo.ordblks); # if CONFIG_MM_BACKTRACE >= 0 nxsched_foreach(mm_dump_handler, heap); # endif #endif #ifdef CONFIG_MM_PANIC_ON_FAILURE PANIC(); #endif } #endif DEBUGASSERT(ret == NULL || ((uintptr_t)ret) % MM_ALIGN == 0); return ret; }