[PATCH 1/5] dlmalloc: add aliases with dl as prefix
Ahmad Fatoum
a.fatoum at pengutronix.de
Mon Nov 25 07:20:20 PST 2024
tlsf function already have tlsf_ as prefix. Let's add dl as prefix for
the dlmalloc functions.
The point of this is that we can at a later time start compiling in more
than one allocator into barebox: An allocator that's being fuzzed and
one for everything else (normally libc malloc).
Signed-off-by: Ahmad Fatoum <a.fatoum at pengutronix.de>
---
common/dlmalloc.c | 66 ++++++++++++++++++++++++----------------------
include/dlmalloc.h | 15 +++++++++++
2 files changed, 49 insertions(+), 32 deletions(-)
create mode 100644 include/dlmalloc.h
diff --git a/common/dlmalloc.c b/common/dlmalloc.c
index f92863f180d5..7993a20e0bd4 100644
--- a/common/dlmalloc.c
+++ b/common/dlmalloc.c
@@ -4,6 +4,7 @@
#include <malloc.h>
#include <string.h>
#include <memory.h>
+#include <dlmalloc.h>
#include <linux/overflow.h>
#include <linux/build_bug.h>
@@ -34,38 +35,29 @@
(Much fuller descriptions are contained in the program documentation below.)
- malloc(size_t n);
+ dlmalloc(size_t n);
Return a pointer to a newly allocated chunk of at least n bytes, or null
if no space is available.
- free(Void_t* p);
+ dlfree(Void_t* p);
Release the chunk of memory pointed to by p, or no effect if p is null.
- realloc(Void_t* p, size_t n);
+ dlrealloc(Void_t* p, size_t n);
Return a pointer to a chunk of size n that contains the same data
as does chunk p up to the minimum of (n, p's size) bytes, or null
if no space is available. The returned pointer may or may not be
the same as p. If p is null, equivalent to malloc. Unless the
#define REALLOC_ZERO_BYTES_FREES below is set, realloc with a
size argument of zero (re)allocates a minimum-sized chunk.
- memalign(size_t alignment, size_t n);
+ dlmemalign(size_t alignment, size_t n);
Return a pointer to a newly allocated chunk of n bytes, aligned
in accord with the alignment argument, which must be a power of
two.
- valloc(size_t n);
- Equivalent to memalign(pagesize, n), where pagesize is the page
- size of the system (or as near to this as can be figured out from
- all the includes/defines below.)
- pvalloc(size_t n);
- Equivalent to valloc(minimum-page-that-holds(n)), that is,
- round up n to nearest pagesize.
- calloc(size_t unit, size_t quantity);
+ dlcalloc(size_t unit, size_t quantity);
Returns a pointer to quantity * unit bytes, with all locations
set to zero.
- cfree(Void_t* p);
- Equivalent to free(p).
malloc_trim(size_t pad);
Release all but pad bytes of freed top-most memory back
to the system. Return 1 if successful, else 0.
- malloc_usable_size(Void_t* p);
+ dlmalloc_usable_size(Void_t* p);
Report the number usable allocated bytes associated with allocated
chunk p. This may or may not report more bytes than were requested,
due to alignment and minimum size constraints.
@@ -1083,7 +1075,7 @@ static void malloc_extend_top(INTERNAL_SIZE_T nb)
SIZE_SZ | PREV_INUSE;
/* If possible, release the rest. */
if (old_top_size >= MINSIZE)
- free(chunk2mem (old_top));
+ dlfree(chunk2mem (old_top));
}
}
@@ -1152,7 +1144,7 @@ static void malloc_extend_top(INTERNAL_SIZE_T nb)
chunk borders either a previously allocated and still in-use chunk,
or the base of its memory arena.)
*/
-void *malloc(size_t bytes)
+void *dlmalloc(size_t bytes)
{
mchunkptr victim; /* inspected/selected chunk */
INTERNAL_SIZE_T victim_size; /* its size */
@@ -1357,7 +1349,7 @@ void *malloc(size_t bytes)
placed in corresponding bins. (This includes the case of
consolidating with the current `last_remainder').
*/
-void free(void *mem)
+void dlfree(void *mem)
{
mchunkptr p; /* chunk corresponding to mem */
INTERNAL_SIZE_T hd; /* its head field */
@@ -1432,7 +1424,7 @@ void free(void *mem)
frontlink(p, sz, idx, bck, fwd);
}
-size_t malloc_usable_size(void *mem)
+size_t dlmalloc_usable_size(void *mem)
{
mchunkptr p;
@@ -1474,7 +1466,7 @@ size_t malloc_usable_size(void *mem)
and allowing it would also allow too many other incorrect
usages of realloc to be sensible.
*/
-void *realloc(void *oldmem, size_t bytes)
+void *dlrealloc(void *oldmem, size_t bytes)
{
INTERNAL_SIZE_T nb; /* padded request size */
@@ -1499,7 +1491,7 @@ void *realloc(void *oldmem, size_t bytes)
#ifdef REALLOC_ZERO_BYTES_FREES
if (bytes == 0) {
- free(oldmem);
+ dlfree(oldmem);
return NULL;
}
#endif
@@ -1511,7 +1503,7 @@ void *realloc(void *oldmem, size_t bytes)
/* realloc of null is supposed to be same as malloc */
if (!oldmem)
- return malloc(bytes);
+ return dlmalloc(bytes);
newp = oldp = mem2chunk(oldmem);
newsize = oldsize = chunksize(oldp);
@@ -1608,7 +1600,7 @@ void *realloc(void *oldmem, size_t bytes)
/* Must allocate */
- newmem = malloc(bytes);
+ newmem = dlmalloc(bytes);
if (!newmem) /* propagate failure */
return NULL;
@@ -1624,7 +1616,7 @@ void *realloc(void *oldmem, size_t bytes)
/* Otherwise copy, free, and exit */
memcpy(newmem, oldmem, oldsize - SIZE_SZ);
- free(oldmem);
+ dlfree(oldmem);
return newmem;
}
@@ -1637,7 +1629,7 @@ void *realloc(void *oldmem, size_t bytes)
set_head_size(newp, nb);
set_head(remainder, remainder_size | PREV_INUSE);
set_inuse_bit_at_offset(remainder, remainder_size);
- free (chunk2mem(remainder)); /* let free() deal with it */
+ dlfree(chunk2mem(remainder)); /* let free() deal with it */
} else {
set_head_size(newp, newsize);
set_inuse_bit_at_offset(newp, newsize);
@@ -1661,7 +1653,7 @@ void *realloc(void *oldmem, size_t bytes)
Overreliance on memalign is a sure way to fragment space.
*/
-void *memalign(size_t alignment, size_t bytes)
+void *dlmemalign(size_t alignment, size_t bytes)
{
INTERNAL_SIZE_T nb; /* padded request size */
char *m; /* memory returned by malloc call */
@@ -1681,7 +1673,7 @@ void *memalign(size_t alignment, size_t bytes)
/* If need less alignment than we give anyway, just relay to malloc */
if (alignment <= MALLOC_ALIGNMENT)
- return malloc(bytes);
+ return dlmalloc(bytes);
/* Otherwise, ensure that it is at least a minimum chunk size */
@@ -1691,7 +1683,7 @@ void *memalign(size_t alignment, size_t bytes)
/* Call malloc with worst case padding to hit alignment. */
nb = request2size(bytes);
- m = (char*)(malloc (nb + alignment + MINSIZE));
+ m = (char*)(dlmalloc(nb + alignment + MINSIZE));
if (!m)
return NULL; /* propagate failure */
@@ -1724,7 +1716,7 @@ void *memalign(size_t alignment, size_t bytes)
set_head(newp, newsize | PREV_INUSE);
set_inuse_bit_at_offset(newp, newsize);
set_head_size(p, leadsize);
- free(chunk2mem(p));
+ dlfree(chunk2mem(p));
p = newp;
}
@@ -1736,7 +1728,7 @@ void *memalign(size_t alignment, size_t bytes)
remainder = chunk_at_offset(p, nb);
set_head(remainder, remainder_size | PREV_INUSE);
set_head_size(p, nb);
- free (chunk2mem(remainder));
+ dlfree(chunk2mem(remainder));
}
return chunk2mem(p);
@@ -1747,7 +1739,7 @@ void *memalign(size_t alignment, size_t bytes)
* calloc calls malloc, then zeroes out the allocated chunk.
*
*/
-void *calloc(size_t n, size_t elem_size)
+void *dlcalloc(size_t n, size_t elem_size)
{
mchunkptr p;
INTERNAL_SIZE_T csz;
@@ -1763,7 +1755,7 @@ void *calloc(size_t n, size_t elem_size)
return NULL;
}
- mem = malloc(sz);
+ mem = dlmalloc(sz);
if (!mem)
return NULL;
@@ -1959,7 +1951,17 @@ void malloc_stats(void)
*/
+#ifdef CONFIG_MALLOC_DLMALLOC
+void *malloc(size_t) __alias(dlmalloc);
EXPORT_SYMBOL(malloc);
+void *calloc(size_t, size_t) __alias(dlcalloc);
EXPORT_SYMBOL(calloc);
+void free(void *) __alias(dlfree);
EXPORT_SYMBOL(free);
+void *realloc(void *, size_t) __alias(dlrealloc);
EXPORT_SYMBOL(realloc);
+void *memalign(size_t, size_t) __alias(dlmemalign);
+EXPORT_SYMBOL(memalign);
+size_t malloc_usable_size(void *) __alias(dlmalloc_usable_size);
+EXPORT_SYMBOL(malloc_usable_size);
+#endif
diff --git a/include/dlmalloc.h b/include/dlmalloc.h
new file mode 100644
index 000000000000..90b647314230
--- /dev/null
+++ b/include/dlmalloc.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __DLMALLOC_H
+#define __DLMALLOC_H
+
+#include <linux/compiler.h>
+#include <types.h>
+
+void *dlmalloc(size_t) __alloc_size(1);
+size_t dlmalloc_usable_size(void *);
+void dlfree(void *);
+void *dlrealloc(void *, size_t) __realloc_size(2);
+void *dlmemalign(size_t, size_t) __alloc_size(2);
+void *dlcalloc(size_t, size_t) __alloc_size(1, 2);
+
+#endif /* __DLMALLOC_H */
--
2.39.5
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