429 lines
10 KiB
C
429 lines
10 KiB
C
/*
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* This file is part of the libpayload project.
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*
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* Copyright (C) 2008 Advanced Micro Devices, Inc.
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* Copyright (C) 2008-2010 coresystems GmbH
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* This is a classically weak malloc() implementation. We have a relatively
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* small and static heap, so we take the easy route with an O(N) loop
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* through the tree for every malloc() and free(). Obviously, this doesn't
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* scale past a few hundred KB (if that).
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*
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* We're also susceptible to the usual buffer overrun poisoning, though the
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* risk is within acceptable ranges for this implementation (don't overrun
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* your buffers, kids!).
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*/
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#define IN_MALLOC_C
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#include <libpayload.h>
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extern char _heap, _eheap; /* Defined in the ldscript. */
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static void *hstart = (void *)&_heap;
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static void *hend = (void *)&_eheap;
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typedef unsigned int hdrtype_t;
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#define MAGIC (0x2a << 26)
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#define FLAG_FREE (1 << 25)
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#define FLAG_USED (1 << 24)
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#define SIZE(_h) ((_h) & 0xFFFFFF)
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#define _HEADER(_s, _f) ((hdrtype_t) (MAGIC | (_f) | ((_s) & 0xFFFFFF)))
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#define FREE_BLOCK(_s) _HEADER(_s, FLAG_FREE)
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#define USED_BLOCK(_s) _HEADER(_s, FLAG_USED)
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#define HDRSIZE (sizeof(hdrtype_t))
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#define IS_FREE(_h) (((_h) & (MAGIC | FLAG_FREE)) == (MAGIC | FLAG_FREE))
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#define HAS_MAGIC(_h) (((_h) & MAGIC) == MAGIC)
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static int free_aligned(void* addr);
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void print_malloc_map(void);
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#ifdef CONFIG_DEBUG_MALLOC
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static int heap_initialized = 0;
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static int minimal_free = 0;
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#endif
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static void setup(hdrtype_t volatile *start, int size)
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{
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*start = FREE_BLOCK(size);
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#ifdef CONFIG_DEBUG_MALLOC
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heap_initialized = 1;
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minimal_free = size;
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#endif
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}
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static void *alloc(int len)
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{
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hdrtype_t header;
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hdrtype_t volatile *ptr = (hdrtype_t volatile *) hstart;
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/* Align the size. */
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len = (len + 3) & ~3;
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if (!len || len > 0xffffff)
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return (void *)NULL;
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/* Make sure the region is setup correctly. */
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if (!HAS_MAGIC(*ptr))
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setup(ptr, len);
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/* Find some free space. */
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do {
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header = *ptr;
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int size = SIZE(header);
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if (!HAS_MAGIC(header) || size == 0) {
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printf("memory allocator panic. (%s%s)\n",
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!HAS_MAGIC(header) ? " no magic " : "",
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size == 0 ? " size=0 " : "");
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halt();
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}
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if (header & FLAG_FREE) {
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if (len <= size) {
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hdrtype_t volatile *nptr = ptr + (HDRSIZE + len);
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int nsize = size - (HDRSIZE + len);
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/* If there is still room in this block,
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* then mark it as such otherwise account
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* the whole space for that block.
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*/
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if (nsize > 0) {
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/* Mark the block as used. */
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*ptr = USED_BLOCK(len);
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/* Create a new free block. */
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*nptr = FREE_BLOCK(nsize);
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} else {
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/* Mark the block as used. */
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*ptr = USED_BLOCK(size);
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}
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return (void *)(ptr + HDRSIZE);
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}
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}
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ptr += HDRSIZE + size;
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} while (ptr < (hdrtype_t *) hend);
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/* Nothing available. */
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return (void *)NULL;
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}
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static void _consolidate(void)
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{
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void *ptr = hstart;
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while (ptr < hend) {
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void *nptr;
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hdrtype_t hdr = *((hdrtype_t *) ptr);
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unsigned int size = 0;
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if (!IS_FREE(hdr)) {
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ptr += HDRSIZE + SIZE(hdr);
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continue;
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}
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size = SIZE(hdr);
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nptr = ptr + HDRSIZE + SIZE(hdr);
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while (nptr < hend) {
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hdrtype_t nhdr = *((hdrtype_t *) nptr);
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if (!(IS_FREE(nhdr)))
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break;
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size += SIZE(nhdr) + HDRSIZE;
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*((hdrtype_t *) nptr) = 0;
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nptr += (HDRSIZE + SIZE(nhdr));
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}
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*((hdrtype_t *) ptr) = FREE_BLOCK(size);
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ptr = nptr;
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}
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}
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void free(void *ptr)
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{
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hdrtype_t hdr;
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if (free_aligned(ptr)) return;
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ptr -= HDRSIZE;
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/* Sanity check. */
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if (ptr < hstart || ptr >= hend)
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return;
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hdr = *((hdrtype_t *) ptr);
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/* Not our header (we're probably poisoned). */
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if (!HAS_MAGIC(hdr))
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return;
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/* Double free. */
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if (hdr & FLAG_FREE)
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return;
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*((hdrtype_t *) ptr) = FREE_BLOCK(SIZE(hdr));
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_consolidate();
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}
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void *malloc(size_t size)
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{
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return alloc(size);
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}
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void *calloc(size_t nmemb, size_t size)
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{
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size_t total = nmemb * size;
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void *ptr = alloc(total);
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if (ptr)
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memset(ptr, 0, total);
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return ptr;
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}
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void *realloc(void *ptr, size_t size)
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{
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void *ret, *pptr;
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unsigned int osize;
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if (ptr == NULL)
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return alloc(size);
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pptr = ptr - HDRSIZE;
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if (!HAS_MAGIC(*((hdrtype_t *) pptr)))
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return NULL;
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/* Get the original size of the block. */
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osize = SIZE(*((hdrtype_t *) pptr));
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/*
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* Free the memory to update the tables - this won't touch the actual
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* memory, so we can still use it for the copy after we have
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* reallocated the new space.
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*/
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free(ptr);
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ret = alloc(size);
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/*
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* if ret == NULL, then doh - failure.
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* if ret == ptr then woo-hoo! no copy needed.
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*/
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if (ret == NULL || ret == ptr)
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return ret;
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/* Copy the memory to the new location. */
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memcpy(ret, ptr, osize > size ? size : osize);
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return ret;
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}
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struct align_region_t
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{
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int alignment;
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/* start in memory, and size in bytes */
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void* start;
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int size;
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/* layout within a region:
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- num_elements bytes, 0: free, 1: used, 2: used, combines with next
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- padding to alignment
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- data section
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- waste space
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start_data points to the start of the data section
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*/
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void* start_data;
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/* number of free blocks sized "alignment" */
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int free;
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struct align_region_t *next;
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};
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static struct align_region_t* align_regions = 0;
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static struct align_region_t *allocate_region(int alignment, int num_elements)
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{
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struct align_region_t *new_region;
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#ifdef CONFIG_DEBUG_MALLOC
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printf("%s(old align_regions=%p, alignment=%u, num_elements=%u)\n",
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__func__, align_regions, alignment, num_elements);
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#endif
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new_region = malloc(sizeof(struct align_region_t));
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if (!new_region)
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return NULL;
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new_region->alignment = alignment;
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new_region->start = malloc((num_elements+1) * alignment + num_elements);
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if (!new_region->start) {
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free(new_region);
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return NULL;
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}
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new_region->start_data = (void*)((u32)(new_region->start + num_elements + alignment - 1) & (~(alignment-1)));
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new_region->size = num_elements * alignment;
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new_region->free = num_elements;
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new_region->next = align_regions;
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memset(new_region->start, 0, num_elements);
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align_regions = new_region;
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return new_region;
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}
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static int free_aligned(void* addr)
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{
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struct align_region_t *reg = align_regions;
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while (reg != 0)
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{
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if ((addr >= reg->start_data) && (addr < reg->start_data + reg->size))
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{
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int i = (addr-reg->start_data)/reg->alignment;
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while (((u8*)reg->start)[i]==2)
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{
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((u8*)reg->start)[i++]=0;
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reg->free++;
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}
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((u8*)reg->start)[i]=0;
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reg->free++;
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return 1;
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}
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reg = reg->next;
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}
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return 0;
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}
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void *memalign(size_t align, size_t size)
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{
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if (size == 0) return 0;
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if (align_regions == 0) {
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align_regions = malloc(sizeof(struct align_region_t));
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if (align_regions == NULL)
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return NULL;
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memset(align_regions, 0, sizeof(struct align_region_t));
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}
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struct align_region_t *reg = align_regions;
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look_further:
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while (reg != 0)
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{
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if ((reg->alignment == align) && (reg->free >= (size + align - 1)/align))
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{
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#ifdef CONFIG_DEBUG_MALLOC
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printf(" found memalign region. %x free, %x required\n", reg->free, (size + align - 1)/align);
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#endif
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break;
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}
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reg = reg->next;
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}
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if (reg == 0)
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{
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#ifdef CONFIG_DEBUG_MALLOC
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printf(" need to allocate a new memalign region\n");
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#endif
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/* get align regions */
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reg = allocate_region(align, (size<1024)?(1024/align):(((size-1)/align)+1));
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#ifdef CONFIG_DEBUG_MALLOC
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printf(" ... returned %p\n", align_regions);
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#endif
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}
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if (reg == 0) {
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/* Nothing available. */
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return (void *)NULL;
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}
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int i, count = 0, target = (size+align-1)/align;
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for (i = 0; i < (reg->size/align); i++)
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{
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if (((u8*)reg->start)[i] == 0)
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{
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count++;
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if (count == target) {
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count = i+1-count;
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for (i=0; i<target-1; i++)
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{
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((u8*)reg->start)[count+i]=2;
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}
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((u8*)reg->start)[count+target-1]=1;
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reg->free -= target;
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return reg->start_data+(align*count);
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}
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} else {
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count = 0;
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}
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}
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goto look_further; // end condition is once a new region is allocated - it always has enough space
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}
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/* This is for debugging purposes. */
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#ifdef CONFIG_DEBUG_MALLOC
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void print_malloc_map(void)
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{
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void *ptr = hstart;
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int free_memory = 0;
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while (ptr < hend) {
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hdrtype_t hdr = *((hdrtype_t *) ptr);
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if (!HAS_MAGIC(hdr)) {
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if (heap_initialized)
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printf("Poisoned magic - we're toast\n");
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else
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printf("No magic yet - going to initialize\n");
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break;
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}
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/* FIXME: Verify the size of the block. */
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printf("%x: %s (%x bytes)\n",
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(unsigned int)(ptr - hstart),
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hdr & FLAG_FREE ? "FREE" : "USED", SIZE(hdr));
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if (hdr & FLAG_FREE)
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free_memory += SIZE(hdr);
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ptr += HDRSIZE + SIZE(hdr);
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}
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if (free_memory && (minimal_free > free_memory))
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minimal_free = free_memory;
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printf("Maximum memory consumption: %d bytes",
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(unsigned int)(&_eheap - &_heap) - HDRSIZE - minimal_free);
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}
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#endif
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