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/* Compatibility code for malloc debugging and state management.
Copyright (C) 2001-2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Wolfram Gloger <wg@malloc.de>, 2001.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, see <https://www.gnu.org/licenses/>. */
#ifndef weak_variable
# define weak_variable weak_function
#endif
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_24)
void (*__malloc_initialize_hook) (void);
compat_symbol (libc, __malloc_initialize_hook,
__malloc_initialize_hook, GLIBC_2_0);
#endif
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_34)
void weak_variable (*__after_morecore_hook) (void) = NULL;
compat_symbol (libc, __after_morecore_hook, __after_morecore_hook, GLIBC_2_0);
void *(*__morecore)(ptrdiff_t);
compat_symbol (libc, __morecore, __morecore, GLIBC_2_0);
#endif
static void *malloc_hook_ini (size_t, const void *) __THROW;
static void *realloc_hook_ini (void *, size_t, const void *) __THROW;
static void *memalign_hook_ini (size_t, size_t, const void *) __THROW;
void weak_variable (*__free_hook) (void *, const void *) = NULL;
void *weak_variable (*__malloc_hook)
(size_t, const void *) = malloc_hook_ini;
void *weak_variable (*__realloc_hook)
(void *, size_t, const void *) = realloc_hook_ini;
void *weak_variable (*__memalign_hook)
(size_t, size_t, const void *) = memalign_hook_ini;
/* Hooks for debugging versions. The initial hooks just call the
initialization routine, then do the normal work. */
/* These hooks will get executed only through the interposed allocator
functions in libc_malloc_debug.so. This means that the calls to malloc,
realloc, etc. will lead back into the interposed functions, which is what we
want.
These initial hooks are assumed to be called in a single-threaded context,
so it is safe to reset all hooks at once upon initialization. */
static void
generic_hook_ini (void)
{
__malloc_hook = NULL;
__realloc_hook = NULL;
__memalign_hook = NULL;
ptmalloc_init ();
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_24)
void (*hook) (void) = atomic_forced_read (__malloc_initialize_hook);
if (hook != NULL)
(*hook)();
#endif
__malloc_initialized = 1;
}
static void *
malloc_hook_ini (size_t sz, const void *caller)
{
generic_hook_ini ();
return malloc (sz);
}
static void *
realloc_hook_ini (void *ptr, size_t sz, const void *caller)
{
generic_hook_ini ();
return realloc (ptr, sz);
}
static void *
memalign_hook_ini (size_t alignment, size_t sz, const void *caller)
{
generic_hook_ini ();
return memalign (alignment, sz);
}
#include "malloc-check.c"
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_25)
/* Support for restoring dumped heaps contained in historic Emacs
executables. The heap saving feature (malloc_get_state) is no
longer implemented in this version of glibc, but we have a heap
rewriter in malloc_set_state which transforms the heap into a
version compatible with current malloc. */
#define MALLOC_STATE_MAGIC 0x444c4541l
#define MALLOC_STATE_VERSION (0 * 0x100l + 5l) /* major*0x100 + minor */
struct malloc_save_state
{
long magic;
long version;
mbinptr av[NBINS * 2 + 2];
char *sbrk_base;
int sbrked_mem_bytes;
unsigned long trim_threshold;
unsigned long top_pad;
unsigned int n_mmaps_max;
unsigned long mmap_threshold;
int check_action;
unsigned long max_sbrked_mem;
unsigned long max_total_mem; /* Always 0, for backwards compatibility. */
unsigned int n_mmaps;
unsigned int max_n_mmaps;
unsigned long mmapped_mem;
unsigned long max_mmapped_mem;
int using_malloc_checking;
unsigned long max_fast;
unsigned long arena_test;
unsigned long arena_max;
unsigned long narenas;
};
/* Dummy implementation which always fails. We need to provide this
symbol so that existing Emacs binaries continue to work with
BIND_NOW. */
void *
attribute_compat_text_section
malloc_get_state (void)
{
__set_errno (ENOSYS);
return NULL;
}
compat_symbol (libc, malloc_get_state, malloc_get_state, GLIBC_2_0);
int
attribute_compat_text_section
malloc_set_state (void *msptr)
{
struct malloc_save_state *ms = (struct malloc_save_state *) msptr;
if (ms->magic != MALLOC_STATE_MAGIC)
return -1;
/* Must fail if the major version is too high. */
if ((ms->version & ~0xffl) > (MALLOC_STATE_VERSION & ~0xffl))
return -2;
/* We do not need to perform locking here because malloc_set_state
must be called before the first call into the malloc subsytem
(usually via __malloc_initialize_hook). pthread_create always
calls calloc and thus must be called only afterwards, so there
cannot be more than one thread when we reach this point. */
/* Disable the malloc hooks (and malloc checking). */
__malloc_hook = NULL;
__realloc_hook = NULL;
__free_hook = NULL;
__memalign_hook = NULL;
using_malloc_checking = 0;
/* Patch the dumped heap. We no longer try to integrate into the
existing heap. Instead, we mark the existing chunks as mmapped.
Together with the update to dumped_main_arena_start and
dumped_main_arena_end, realloc and free will recognize these
chunks as dumped fake mmapped chunks and never free them. */
/* Find the chunk with the lowest address with the heap. */
mchunkptr chunk = NULL;
{
size_t *candidate = (size_t *) ms->sbrk_base;
size_t *end = (size_t *) (ms->sbrk_base + ms->sbrked_mem_bytes);
while (candidate < end)
if (*candidate != 0)
{
chunk = mem2chunk ((void *) (candidate + 1));
break;
}
else
++candidate;
}
if (chunk == NULL)
return 0;
/* Iterate over the dumped heap and patch the chunks so that they
are treated as fake mmapped chunks. */
mchunkptr top = ms->av[2];
while (chunk < top)
{
if (inuse (chunk))
{
/* Mark chunk as mmapped, to trigger the fallback path. */
size_t size = chunksize (chunk);
set_head (chunk, size | IS_MMAPPED);
}
chunk = next_chunk (chunk);
}
/* The dumped fake mmapped chunks all lie in this address range. */
dumped_main_arena_start = (mchunkptr) ms->sbrk_base;
dumped_main_arena_end = top;
return 0;
}
compat_symbol (libc, malloc_set_state, malloc_set_state, GLIBC_2_0);
#endif /* SHLIB_COMPAT */
/*
* Local variables:
* c-basic-offset: 2
* End:
*/
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