2e5213425e
context. Be prepared to fail instead. MMalloc, FFree: ensure that saved file names are properly terminated. Use MCFILENAMELEN instead of the previous explicit constant.
270 lines
8.0 KiB
C
270 lines
8.0 KiB
C
/*-
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* Copyright (c) 1997, 1998
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* Nan Yang Computer Services Limited. All rights reserved.
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*
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* This software is distributed under the so-called ``Berkeley
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* License'':
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Nan Yang Computer
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* Services Limited.
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* 4. Neither the name of the Company nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* This software is provided ``as is'', and any express or implied
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* warranties, including, but not limited to, the implied warranties of
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* merchantability and fitness for a particular purpose are disclaimed.
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* In no event shall the company or contributors be liable for any
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* direct, indirect, incidental, special, exemplary, or consequential
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* damages (including, but not limited to, procurement of substitute
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* goods or services; loss of use, data, or profits; or business
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* interruption) however caused and on any theory of liability, whether
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* in contract, strict liability, or tort (including negligence or
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* otherwise) arising in any way out of the use of this software, even if
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* advised of the possibility of such damage.
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*
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* $Id: vinummemory.c,v 1.22 1999/10/12 04:35:48 grog Exp grog $
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* $FreeBSD$
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*/
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#include <dev/vinum/vinumhdr.h>
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#ifdef VINUMDEBUG
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#undef longjmp /* this was defined as LongJmp */
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void longjmp(jmp_buf, int); /* the kernel doesn't define this */
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#include <dev/vinum/request.h>
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extern struct rqinfo rqinfo[];
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extern struct rqinfo *rqip;
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int rqinfo_size = RQINFO_SIZE; /* for debugger */
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#ifdef __i386__ /* check for validity */
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void
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LongJmp(jmp_buf buf, int retval)
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{
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/*
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* longjmp is not documented, not even jmp_buf.
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* This is what's in i386/i386/support.s:
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* ENTRY(longjmp)
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* movl 4(%esp),%eax
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* movl (%eax),%ebx restore ebx
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* movl 4(%eax),%esp restore esp
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* movl 8(%eax),%ebp restore ebp
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* movl 12(%eax),%esi restore esi
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* movl 16(%eax),%edi restore edi
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* movl 20(%eax),%edx get rta
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* movl %edx,(%esp) put in return frame
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* xorl %eax,%eax return(1);
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* incl %eax
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* ret
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*
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* from which we deduce the structure of jmp_buf:
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*/
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struct JmpBuf {
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int jb_ebx;
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int jb_esp;
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int jb_ebp;
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int jb_esi;
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int jb_edi;
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int jb_eip;
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};
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struct JmpBuf *jb = (struct JmpBuf *) buf;
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if ((jb->jb_esp < 0xc0000000)
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|| (jb->jb_ebp < 0xc0000000)
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|| (jb->jb_eip < 0xc0000000))
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panic("Invalid longjmp");
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longjmp(buf, retval);
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}
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/* find the base name of a path name */
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char *
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basename(char *file)
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{
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char *f = rindex(file, '/'); /* chop off dirname if present */
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if (f == NULL)
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return file;
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else
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return ++f; /* skip the / */
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}
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#else
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#define LongJmp longjmp /* just use the kernel function */
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#endif
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#endif
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void
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expand_table(void **table, int oldsize, int newsize)
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{
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if (newsize > oldsize) {
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int *temp;
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temp = (int *) Malloc(newsize); /* allocate a new table */
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CHECKALLOC(temp, "vinum: Can't expand table\n");
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bzero((char *) temp, newsize); /* clean it all out */
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if (*table != NULL) { /* already something there, */
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bcopy((char *) *table, (char *) temp, oldsize); /* copy it to the old table */
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Free(*table);
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}
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*table = temp;
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}
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}
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#if VINUMDEBUG /* XXX debug */
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#define MALLOCENTRIES 16384
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int malloccount = 0;
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int highwater = 0; /* highest index ever allocated */
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struct mc malloced[MALLOCENTRIES];
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#define FREECOUNT 64
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int freecount = FREECOUNT; /* for debugger */
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int lastfree = 0;
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struct mc freeinfo[FREECOUNT];
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int total_malloced;
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static int mallocseq = 0;
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caddr_t
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MMalloc(int size, char *file, int line)
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{
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int s;
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caddr_t result;
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int i;
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if (malloccount >= MALLOCENTRIES) { /* too many */
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log(LOG_ERR, "vinum: can't allocate table space to trace memory allocation");
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return 0; /* can't continue */
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}
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/* Wait for malloc if we can */
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result = malloc(size, M_DEVBUF, intr_nesting_level == 0 ? M_WAITOK : M_NOWAIT);
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if (result == NULL)
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log(LOG_ERR, "vinum: can't allocate %d bytes from %s:%d\n", size, file, line);
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else {
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s = splhigh();
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for (i = 0; i < malloccount; i++) {
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if (((result + size) > malloced[i].address)
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&& (result < malloced[i].address + malloced[i].size)) /* overlap */
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Debugger("Malloc overlap");
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}
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if (result) {
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char *f = basename(file);
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i = malloccount++;
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total_malloced += size;
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microtime(&malloced[i].time);
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malloced[i].seq = mallocseq++;
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malloced[i].size = size;
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malloced[i].line = line;
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malloced[i].address = result;
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bcopy(f, malloced[lastfree].file, min(strlen(f), MCFILENAMELEN - 1));
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malloced[lastfree].file[MCFILENAMELEN - 1] = '\0';
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}
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if (malloccount > highwater)
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highwater = malloccount;
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splx(s);
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}
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return result;
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}
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void
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FFree(void *mem, char *file, int line)
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{
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int s;
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int i;
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s = splhigh();
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for (i = 0; i < malloccount; i++) {
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if ((caddr_t) mem == malloced[i].address) { /* found it */
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bzero(mem, malloced[i].size); /* XXX */
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free(mem, M_DEVBUF);
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malloccount--;
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total_malloced -= malloced[i].size;
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if (debug & DEBUG_MEMFREE) { /* keep track of recent frees */
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char *f = rindex(file, '/'); /* chop off dirname if present */
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if (f == NULL)
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f = file;
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else
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f++; /* skip the / */
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microtime(&freeinfo[lastfree].time);
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freeinfo[lastfree].seq = malloced[i].seq;
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freeinfo[lastfree].size = malloced[i].size;
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freeinfo[lastfree].line = line;
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freeinfo[lastfree].address = mem;
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bcopy(f, freeinfo[lastfree].file, min(strlen(f), MCFILENAMELEN - 1));
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freeinfo[lastfree].file[MCFILENAMELEN - 1] = '\0';
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if (++lastfree == FREECOUNT)
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lastfree = 0;
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}
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if (i < malloccount) /* more coming after */
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bcopy(&malloced[i + 1], &malloced[i], (malloccount - i) * sizeof(struct mc));
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splx(s);
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return;
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}
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}
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splx(s);
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log(LOG_ERR, "Freeing unallocated data at 0x%08x from %s, line %d\n", (int) mem, file, line);
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Debugger("Free");
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}
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void
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vinum_meminfo(caddr_t data)
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{
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struct meminfo *m = (struct meminfo *) data;
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m->mallocs = malloccount;
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m->total_malloced = total_malloced;
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m->malloced = malloced;
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m->highwater = highwater;
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}
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int
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vinum_mallocinfo(caddr_t data)
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{
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struct mc *m = (struct mc *) data;
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unsigned int ent = m->seq; /* index of entry to return */
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if (ent >= malloccount)
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return ENOENT;
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m->address = malloced[ent].address;
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m->size = malloced[ent].size;
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m->line = malloced[ent].line;
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m->seq = malloced[ent].seq;
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bcopy(malloced[ent].file, m->file, MCFILENAMELEN);
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return 0;
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}
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/*
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* return the nth request trace buffer entry. This
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* is indexed back from the current entry (which
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* has index 0)
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*/
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int
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vinum_rqinfo(caddr_t data)
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{
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struct rqinfo *rq = (struct rqinfo *) data;
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int ent = *(int *) data; /* 1st word is index */
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int lastent = rqip - rqinfo; /* entry number of current entry */
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if (ent >= RQINFO_SIZE) /* out of the table */
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return ENOENT;
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if ((ent = lastent - ent - 1) < 0)
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ent += RQINFO_SIZE; /* roll over backwards */
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bcopy(&rqinfo[ent], rq, sizeof(struct rqinfo));
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return 0;
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}
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#endif
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