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head/usr.bin/kdump/utrace.c

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/*-
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <dlfcn.h>
#include <stdio.h>
#include <strings.h>
int kdump_print_utrace(FILE *, void *, size_t, int);
#define UTRACE_DLOPEN_START 1
#define UTRACE_DLOPEN_STOP 2
#define UTRACE_DLCLOSE_START 3
#define UTRACE_DLCLOSE_STOP 4
#define UTRACE_LOAD_OBJECT 5
#define UTRACE_UNLOAD_OBJECT 6
#define UTRACE_ADD_RUNDEP 7
#define UTRACE_PRELOAD_FINISHED 8
#define UTRACE_INIT_CALL 9
#define UTRACE_FINI_CALL 10
#define UTRACE_DLSYM_START 11
#define UTRACE_DLSYM_STOP 12
struct utrace_rtld {
char sig[4]; /* 'RTLD' */
int event;
void *handle;
void *mapbase;
size_t mapsize;
int refcnt;
char name[MAXPATHLEN];
};
static void
print_utrace_rtld(FILE *fp, void *p, size_t len, int decimal)
{
struct utrace_rtld *ut = p;
unsigned char *cp;
void *parent;
int mode;
switch (ut->event) {
case UTRACE_DLOPEN_START:
mode = ut->refcnt;
fprintf(fp, "dlopen(%s, ", ut->name);
switch (mode & RTLD_MODEMASK) {
case RTLD_NOW:
fprintf(fp, "RTLD_NOW");
break;
case RTLD_LAZY:
fprintf(fp, "RTLD_LAZY");
break;
default:
fprintf(fp, "%#x", mode & RTLD_MODEMASK);
}
if (mode & RTLD_GLOBAL)
fprintf(fp, " | RTLD_GLOBAL");
if (mode & RTLD_TRACE)
fprintf(fp, " | RTLD_TRACE");
if (mode & ~(RTLD_MODEMASK | RTLD_GLOBAL | RTLD_TRACE))
fprintf(fp, " | %#x", mode &
~(RTLD_MODEMASK | RTLD_GLOBAL | RTLD_TRACE));
fprintf(fp, ")");
break;
case UTRACE_DLOPEN_STOP:
fprintf(fp, "%p = dlopen(%s) ref %d", ut->handle, ut->name,
ut->refcnt);
break;
case UTRACE_DLCLOSE_START:
fprintf(fp, "dlclose(%p) (%s, %d)", ut->handle, ut->name,
ut->refcnt);
break;
case UTRACE_DLCLOSE_STOP:
fprintf(fp, "dlclose(%p) finished", ut->handle);
break;
case UTRACE_LOAD_OBJECT:
fprintf(fp, "RTLD: loaded %p @ %p - %p (%s)", ut->handle,
ut->mapbase, (char *)ut->mapbase + ut->mapsize - 1,
ut->name);
break;
case UTRACE_UNLOAD_OBJECT:
fprintf(fp, "RTLD: unloaded %p @ %p - %p (%s)", ut->handle,
ut->mapbase, (char *)ut->mapbase + ut->mapsize - 1,
ut->name);
break;
case UTRACE_ADD_RUNDEP:
parent = ut->mapbase;
fprintf(fp, "RTLD: %p now depends on %p (%s, %d)", parent,
ut->handle, ut->name, ut->refcnt);
break;
case UTRACE_PRELOAD_FINISHED:
fprintf(fp, "RTLD: LD_PRELOAD finished");
break;
case UTRACE_INIT_CALL:
fprintf(fp, "RTLD: init %p for %p (%s)", ut->mapbase, ut->handle,
ut->name);
break;
case UTRACE_FINI_CALL:
fprintf(fp, "RTLD: fini %p for %p (%s)", ut->mapbase, ut->handle,
ut->name);
break;
case UTRACE_DLSYM_START:
fprintf(fp, "RTLD: dlsym(%p, %s)", ut->handle, ut->name);
break;
case UTRACE_DLSYM_STOP:
fprintf(fp, "RTLD: %p = dlsym(%p, %s)", ut->mapbase, ut->handle,
ut->name);
break;
default:
cp = p;
cp += 4;
len -= 4;
fprintf(fp, "RTLD: %zu ", len);
while (len--)
if (decimal)
fprintf(fp, " %d", *cp++);
else
fprintf(fp, " %02x", *cp++);
}
}
struct utrace_malloc {
void *p;
size_t s;
void *r;
};
static void
print_utrace_malloc(FILE *fp, void *p)
{
struct utrace_malloc *ut = p;
if (ut->p == (void *)(intptr_t)(-1))
fprintf(fp, "malloc_init()");
else if (ut->s == 0)
fprintf(fp, "free(%p)", ut->p);
else if (ut->p == NULL)
fprintf(fp, "%p = malloc(%zu)", ut->r, ut->s);
else
fprintf(fp, "%p = realloc(%p, %zu)", ut->r, ut->p, ut->s);
}
int
kdump_print_utrace(FILE *fp, void *p, size_t len, int decimal)
{
if (len >= 8 && bcmp(p, "RTLD", 4) == 0) {
print_utrace_rtld(fp, p, len, decimal);
return (1);
}
if (len == sizeof(struct utrace_malloc)) {
print_utrace_malloc(fp, p);
return (1);
}
return (0);
}