68e9b1e8e1
Suppose that ktrace is performed on 32bit binary running on 64bit host. In this case, the kernel records are 64bit, while utrace records from rtld and malloc are 32bit. Make kdump useful to see decoded utrace data in that case. Sponsored by: The FreeBSD Foundation MFC after: 1 week
230 lines
6.0 KiB
C
230 lines
6.0 KiB
C
/*-
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* Copyright (c) 1988, 1993
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* The Regents of the University of California. All rights reserved.
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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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* 4. Neither the name of the University 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <dlfcn.h>
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#include <stdio.h>
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#include <string.h>
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#include <sysdecode.h>
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#define UTRACE_DLOPEN_START 1
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#define UTRACE_DLOPEN_STOP 2
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#define UTRACE_DLCLOSE_START 3
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#define UTRACE_DLCLOSE_STOP 4
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#define UTRACE_LOAD_OBJECT 5
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#define UTRACE_UNLOAD_OBJECT 6
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#define UTRACE_ADD_RUNDEP 7
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#define UTRACE_PRELOAD_FINISHED 8
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#define UTRACE_INIT_CALL 9
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#define UTRACE_FINI_CALL 10
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#define UTRACE_DLSYM_START 11
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#define UTRACE_DLSYM_STOP 12
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struct utrace_rtld {
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char sig[4]; /* 'RTLD' */
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int event;
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void *handle;
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void *mapbase;
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size_t mapsize;
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int refcnt;
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char name[MAXPATHLEN];
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};
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#ifdef __LP64__
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struct utrace_rtld32 {
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char sig[4]; /* 'RTLD' */
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int event;
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uint32_t handle;
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uint32_t mapbase;
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uint32_t mapsize;
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int refcnt;
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char name[MAXPATHLEN];
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};
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#endif
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static int
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print_utrace_rtld(FILE *fp, void *p)
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{
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struct utrace_rtld *ut = p;
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void *parent;
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int mode;
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switch (ut->event) {
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case UTRACE_DLOPEN_START:
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mode = ut->refcnt;
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fprintf(fp, "dlopen(%s, ", ut->name);
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switch (mode & RTLD_MODEMASK) {
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case RTLD_NOW:
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fprintf(fp, "RTLD_NOW");
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break;
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case RTLD_LAZY:
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fprintf(fp, "RTLD_LAZY");
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break;
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default:
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fprintf(fp, "%#x", mode & RTLD_MODEMASK);
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}
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if (mode & RTLD_GLOBAL)
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fprintf(fp, " | RTLD_GLOBAL");
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if (mode & RTLD_TRACE)
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fprintf(fp, " | RTLD_TRACE");
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if (mode & ~(RTLD_MODEMASK | RTLD_GLOBAL | RTLD_TRACE))
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fprintf(fp, " | %#x", mode &
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~(RTLD_MODEMASK | RTLD_GLOBAL | RTLD_TRACE));
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fprintf(fp, ")");
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break;
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case UTRACE_DLOPEN_STOP:
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fprintf(fp, "%p = dlopen(%s) ref %d", ut->handle, ut->name,
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ut->refcnt);
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break;
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case UTRACE_DLCLOSE_START:
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fprintf(fp, "dlclose(%p) (%s, %d)", ut->handle, ut->name,
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ut->refcnt);
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break;
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case UTRACE_DLCLOSE_STOP:
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fprintf(fp, "dlclose(%p) finished", ut->handle);
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break;
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case UTRACE_LOAD_OBJECT:
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fprintf(fp, "RTLD: loaded %p @ %p - %p (%s)", ut->handle,
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ut->mapbase, (char *)ut->mapbase + ut->mapsize - 1,
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ut->name);
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break;
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case UTRACE_UNLOAD_OBJECT:
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fprintf(fp, "RTLD: unloaded %p @ %p - %p (%s)", ut->handle,
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ut->mapbase, (char *)ut->mapbase + ut->mapsize - 1,
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ut->name);
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break;
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case UTRACE_ADD_RUNDEP:
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parent = ut->mapbase;
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fprintf(fp, "RTLD: %p now depends on %p (%s, %d)", parent,
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ut->handle, ut->name, ut->refcnt);
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break;
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case UTRACE_PRELOAD_FINISHED:
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fprintf(fp, "RTLD: LD_PRELOAD finished");
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break;
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case UTRACE_INIT_CALL:
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fprintf(fp, "RTLD: init %p for %p (%s)", ut->mapbase, ut->handle,
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ut->name);
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break;
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case UTRACE_FINI_CALL:
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fprintf(fp, "RTLD: fini %p for %p (%s)", ut->mapbase, ut->handle,
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ut->name);
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break;
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case UTRACE_DLSYM_START:
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fprintf(fp, "RTLD: dlsym(%p, %s)", ut->handle, ut->name);
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break;
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case UTRACE_DLSYM_STOP:
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fprintf(fp, "RTLD: %p = dlsym(%p, %s)", ut->mapbase, ut->handle,
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ut->name);
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break;
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default:
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return (0);
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}
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return (1);
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}
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struct utrace_malloc {
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void *p;
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size_t s;
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void *r;
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};
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#ifdef __LP64__
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struct utrace_malloc32 {
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uint32_t p;
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uint32_t s;
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uint32_t r;
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};
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#endif
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static void
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print_utrace_malloc(FILE *fp, void *p)
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{
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struct utrace_malloc *ut = p;
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if (ut->p == (void *)(intptr_t)(-1))
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fprintf(fp, "malloc_init()");
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else if (ut->s == 0)
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fprintf(fp, "free(%p)", ut->p);
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else if (ut->p == NULL)
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fprintf(fp, "%p = malloc(%zu)", ut->r, ut->s);
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else
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fprintf(fp, "%p = realloc(%p, %zu)", ut->r, ut->p, ut->s);
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}
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int
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sysdecode_utrace(FILE *fp, void *p, size_t len)
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{
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#ifdef __LP64__
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struct utrace_rtld ur;
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struct utrace_rtld32 *pr;
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struct utrace_malloc um;
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struct utrace_malloc32 *pm;
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#endif
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if (len == sizeof(struct utrace_rtld) && bcmp(p, "RTLD", 4) == 0) {
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return (print_utrace_rtld(fp, p));
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}
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if (len == sizeof(struct utrace_malloc)) {
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print_utrace_malloc(fp, p);
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return (1);
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}
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#ifdef __LP64__
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if (len == sizeof(struct utrace_rtld32) && bcmp(p, "RTLD", 4) == 0) {
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pr = p;
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memset(&ur, 0, sizeof(ur));
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memcpy(ur.sig, pr->sig, sizeof(ur.sig));
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ur.event = pr->event;
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ur.handle = (void *)(uintptr_t)pr->handle;
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ur.mapbase = (void *)(uintptr_t)pr->mapbase;
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ur.mapsize = pr->mapsize;
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ur.refcnt = pr->refcnt;
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memcpy(ur.name, pr->name, sizeof(ur.name));
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return (print_utrace_rtld(fp, &ur));
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}
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if (len == sizeof(struct utrace_malloc32)) {
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pm = p;
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memset(&um, 0, sizeof(um));
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um.p = pm->p == (uint32_t)-1 ? (void *)(intptr_t)-1 :
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(void *)(uintptr_t)pm->p;
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um.s = pm->s;
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um.r = (void *)(uintptr_t)pm->r;
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print_utrace_malloc(fp, &um);
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return (1);
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}
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#endif
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return (0);
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}
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