diff options
Diffstat (limited to 'newlib/libc/sys/linux/mcheck.c')
-rw-r--r-- | newlib/libc/sys/linux/mcheck.c | 358 |
1 files changed, 0 insertions, 358 deletions
diff --git a/newlib/libc/sys/linux/mcheck.c b/newlib/libc/sys/linux/mcheck.c deleted file mode 100644 index eeb99da89..000000000 --- a/newlib/libc/sys/linux/mcheck.c +++ /dev/null @@ -1,358 +0,0 @@ -/* Standard debugging hooks for `malloc'. - Copyright (C) 1990-1997, 1999, 2000, 2001 Free Software Foundation, Inc. - This file is part of the GNU C Library. - Written May 1989 by Mike Haertel. - - 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; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -/* Modified for newlib, July 9, 2002 by Jeff Johnston */ - -#ifndef _MALLOC_INTERNAL -# define _MALLOC_INTERNAL -# include <features.h> -# define _LIBC 1 -# include <malloc.h> -# include <mcheck.h> -# include <stdint.h> -# include <stdio.h> -# include <stdlib.h> -# include <libintl.h> -# include <sys/cdefs.h> -#endif - -/* Old hook values. */ -static void (*old_free_hook) __P ((__ptr_t ptr, __const __ptr_t)); -static __ptr_t (*old_malloc_hook) __P ((__malloc_size_t size, const __ptr_t)); -static __ptr_t (*old_realloc_hook) __P ((__ptr_t ptr, __malloc_size_t size, - __const __ptr_t)); - -/* Function to call when something awful happens. */ -static void (*abortfunc) __P ((enum mcheck_status)); - -/* Arbitrary magical numbers. */ -#define MAGICWORD 0xfedabeeb -#define MAGICFREE 0xd8675309 -#define MAGICBYTE ((char) 0xd7) -#define MALLOCFLOOD ((char) 0x93) -#define FREEFLOOD ((char) 0x95) - -struct hdr - { - __malloc_size_t size; /* Exact size requested by user. */ - unsigned long int magic; /* Magic number to check header integrity. */ - struct hdr *prev; - struct hdr *next; - }; - -/* This is the beginning of the list of all memory blocks allocated. - It is only constructed if the pedantic testing is requested. */ -static struct hdr *root; - -static int mcheck_used; - -/* Nonzero if pedentic checking of all blocks is requested. */ -static int pedantic; - -#if defined _LIBC || defined STDC_HEADERS || defined USG -# include <string.h> -# define flood memset -#else -static void flood __P ((__ptr_t, int, __malloc_size_t)); -static void -flood (ptr, val, size) - __ptr_t ptr; - int val; - __malloc_size_t size; -{ - char *cp = ptr; - while (size--) - *cp++ = val; -} -#endif - -static enum mcheck_status checkhdr __P ((const struct hdr *)); -static enum mcheck_status -checkhdr (hdr) - const struct hdr *hdr; -{ - enum mcheck_status status; - - if (!mcheck_used) - /* Maybe the mcheck used is disabled? This happens when we find - an error and report it. */ - return MCHECK_OK; - - switch (hdr->magic ^ ((uintptr_t) hdr->prev + (uintptr_t) hdr->next)) - { - default: - status = MCHECK_HEAD; - break; - case MAGICFREE: - status = MCHECK_FREE; - break; - case MAGICWORD: - if (((char *) &hdr[1])[hdr->size] != MAGICBYTE) - status = MCHECK_TAIL; - else - status = MCHECK_OK; - break; - } - if (status != MCHECK_OK) - { - mcheck_used = 0; - (*abortfunc) (status); - mcheck_used = 1; - } - return status; -} - -void -mcheck_check_all () -{ - /* Walk through all the active blocks and test whether they were tempered - with. */ - struct hdr *runp = root; - - /* Temporarily turn off the checks. */ - pedantic = 0; - - while (runp != NULL) - { - (void) checkhdr (runp); - - runp = runp->next; - } - - /* Turn checks on again. */ - pedantic = 1; -} - -static void unlink_blk __P ((struct hdr *ptr)); -static void -unlink_blk (ptr) - struct hdr *ptr; -{ - if (ptr->next != NULL) - { - ptr->next->prev = ptr->prev; - ptr->next->magic = MAGICWORD ^ ((uintptr_t) ptr->next->prev - + (uintptr_t) ptr->next->next); - } - if (ptr->prev != NULL) - { - ptr->prev->next = ptr->next; - ptr->prev->magic = MAGICWORD ^ ((uintptr_t) ptr->prev->prev - + (uintptr_t) ptr->prev->next); - } - else - root = ptr->next; -} - -static void link_blk __P ((struct hdr *ptr)); -static void -link_blk (hdr) - struct hdr *hdr; -{ - hdr->prev = NULL; - hdr->next = root; - root = hdr; - hdr->magic = MAGICWORD ^ (uintptr_t) hdr->next; - - /* And the next block. */ - if (hdr->next != NULL) - { - hdr->next->prev = hdr; - hdr->next->magic = MAGICWORD ^ ((uintptr_t) hdr - + (uintptr_t) hdr->next->next); - } -} - -static void freehook __P ((__ptr_t, const __ptr_t)); -static void -freehook (ptr, caller) - __ptr_t ptr; - const __ptr_t caller; -{ - if (pedantic) - mcheck_check_all (); - if (ptr) - { - struct hdr *hdr = ((struct hdr *) ptr) - 1; - checkhdr (hdr); - hdr->magic = MAGICFREE; - unlink_blk (hdr); - hdr->prev = hdr->next = NULL; - flood (ptr, FREEFLOOD, hdr->size); - ptr = (__ptr_t) hdr; - } - __free_hook = old_free_hook; - if (old_free_hook != NULL) - (*old_free_hook) (ptr, caller); - else - free (ptr); - __free_hook = freehook; -} - -static __ptr_t mallochook __P ((__malloc_size_t, const __ptr_t)); -static __ptr_t -mallochook (size, caller) - __malloc_size_t size; - const __ptr_t caller; -{ - struct hdr *hdr; - - if (pedantic) - mcheck_check_all (); - - __malloc_hook = old_malloc_hook; - if (old_malloc_hook != NULL) - hdr = (struct hdr *) (*old_malloc_hook) (sizeof (struct hdr) + size + 1, - caller); - else - hdr = (struct hdr *) malloc (sizeof (struct hdr) + size + 1); - __malloc_hook = mallochook; - if (hdr == NULL) - return NULL; - - hdr->size = size; - link_blk (hdr); - ((char *) &hdr[1])[size] = MAGICBYTE; - flood ((__ptr_t) (hdr + 1), MALLOCFLOOD, size); - return (__ptr_t) (hdr + 1); -} - -static __ptr_t reallochook __P ((__ptr_t, __malloc_size_t, const __ptr_t)); -static __ptr_t -reallochook (ptr, size, caller) - __ptr_t ptr; - __malloc_size_t size; - const __ptr_t caller; -{ - struct hdr *hdr; - __malloc_size_t osize; - - if (pedantic) - mcheck_check_all (); - - if (ptr) - { - hdr = ((struct hdr *) ptr) - 1; - osize = hdr->size; - - checkhdr (hdr); - unlink_blk (hdr); - if (size < osize) - flood ((char *) ptr + size, FREEFLOOD, osize - size); - } - else - { - osize = 0; - hdr = NULL; - } - __free_hook = old_free_hook; - __malloc_hook = old_malloc_hook; - __realloc_hook = old_realloc_hook; - if (old_realloc_hook != NULL) - hdr = (struct hdr *) (*old_realloc_hook) ((__ptr_t) hdr, - sizeof (struct hdr) + size + 1, - caller); - else - hdr = (struct hdr *) realloc ((__ptr_t) hdr, - sizeof (struct hdr) + size + 1); - __free_hook = freehook; - __malloc_hook = mallochook; - __realloc_hook = reallochook; - if (hdr == NULL) - return NULL; - - hdr->size = size; - link_blk (hdr); - ((char *) &hdr[1])[size] = MAGICBYTE; - if (size > osize) - flood ((char *) (hdr + 1) + osize, MALLOCFLOOD, size - osize); - return (__ptr_t) (hdr + 1); -} - -static void mabort __P ((enum mcheck_status status)) - __attribute__ ((noreturn)); -static void -mabort (status) - enum mcheck_status status; -{ - const char *msg; - switch (status) - { - case MCHECK_OK: - msg = _("memory is consistent, library is buggy\n"); - break; - case MCHECK_HEAD: - msg = _("memory clobbered before allocated block\n"); - break; - case MCHECK_TAIL: - msg = _("memory clobbered past end of allocated block\n"); - break; - case MCHECK_FREE: - msg = _("block freed twice\n"); - break; - default: - msg = _("bogus mcheck_status, library is buggy\n"); - break; - } - fprintf (stderr, "mcheck: %s", msg); - fflush (stderr); - abort (); -} - -int -mcheck (func) - void (*func) __P ((enum mcheck_status)); -{ - abortfunc = (func != NULL) ? func : &mabort; - - /* These hooks may not be safely inserted if malloc is already in use. */ - if (__malloc_initialized <= 0 && !mcheck_used) - { - /* We call malloc() once here to ensure it is initialized. */ - void *p = malloc (0); - free (p); - - old_free_hook = __free_hook; - __free_hook = freehook; - old_malloc_hook = __malloc_hook; - __malloc_hook = mallochook; - old_realloc_hook = __realloc_hook; - __realloc_hook = reallochook; - mcheck_used = 1; - } - - return mcheck_used ? 0 : -1; -} - -int -mcheck_pedantic (func) - void (*func) __P ((enum mcheck_status)); -{ - int res = mcheck (func); - if (res == 0) - pedantic = 1; - return res; -} - -enum mcheck_status -mprobe (__ptr_t ptr) -{ - return mcheck_used ? checkhdr (((struct hdr *) ptr) - 1) : MCHECK_DISABLED; -} |