1997-12-20 18:40:43 +00:00
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/*
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2010-03-10 20:31:30 +00:00
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* Copyright 1997 Sean Eric Fagan
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1997-12-20 18:40:43 +00:00
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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 Sean Eric Fagan
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* 4. Neither the name of the author may be used to endorse or promote
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* products derived from this software without specific prior written
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* permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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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1998-01-05 07:30:26 +00:00
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#ifndef lint
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static const char rcsid[] =
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1999-08-28 01:08:13 +00:00
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"$FreeBSD$";
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1998-01-05 07:30:26 +00:00
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#endif /* not lint */
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1997-12-06 05:23:12 +00:00
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/*
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2003-02-20 15:05:39 +00:00
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* FreeBSD/i386-specific system call handling. This is probably the most
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1997-12-06 05:23:12 +00:00
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* complex part of the entire truss program, although I've got lots of
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* it handled relatively cleanly now. The system call names are generated
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* automatically, thanks to /usr/src/sys/kern/syscalls.master. The
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* names used for the various structures are confusing, I sadly admit.
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*/
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2001-10-22 02:02:00 +00:00
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#include <sys/types.h>
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2007-04-10 04:03:34 +00:00
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#include <sys/ptrace.h>
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2012-09-02 11:03:18 +00:00
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#include <sys/syscall.h>
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2001-10-22 02:02:00 +00:00
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#include <machine/reg.h>
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#include <machine/psl.h>
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1998-01-05 07:30:26 +00:00
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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1997-12-06 05:23:12 +00:00
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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2002-08-06 12:46:14 +00:00
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#include <time.h>
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1997-12-06 05:23:12 +00:00
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#include <unistd.h>
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2002-08-04 00:46:48 +00:00
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#include "truss.h"
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1997-12-06 05:23:12 +00:00
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#include "syscall.h"
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2002-11-09 22:46:51 +00:00
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#include "extern.h"
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1997-12-06 05:23:12 +00:00
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#include "syscalls.h"
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2015-08-19 19:59:42 +00:00
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static int nsyscalls = nitems(syscallnames);
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1997-12-06 05:23:12 +00:00
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/*
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* This is what this particular file uses to keep track of a system call.
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* It is probably not quite sufficient -- I can probably use the same
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* structure for the various syscall personalities, and I also probably
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* need to nest system calls (for signal handlers).
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*
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* 'struct syscall' describes the system call; it may be NULL, however,
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* if we don't know about this particular system call yet.
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*/
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2012-09-16 14:38:01 +00:00
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struct freebsd_syscall {
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1997-12-06 05:23:12 +00:00
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struct syscall *sc;
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2002-11-09 22:46:51 +00:00
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const char *name;
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1997-12-06 05:23:12 +00:00
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int number;
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unsigned long *args;
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int nargs; /* number of arguments -- *not* number of words! */
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char **s_args; /* the printable arguments */
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2012-09-16 14:38:01 +00:00
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};
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static struct freebsd_syscall *
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alloc_fsc(void)
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{
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return (malloc(sizeof(struct freebsd_syscall)));
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}
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1997-12-06 05:23:12 +00:00
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/* Clear up and free parts of the fsc structure. */
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2012-09-16 14:38:01 +00:00
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static void
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free_fsc(struct freebsd_syscall *fsc)
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2012-09-02 11:03:18 +00:00
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{
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int i;
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2012-09-16 14:38:01 +00:00
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free(fsc->args);
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if (fsc->s_args) {
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for (i = 0; i < fsc->nargs; i++)
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free(fsc->s_args[i]);
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free(fsc->s_args);
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2012-09-02 11:03:18 +00:00
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}
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2012-09-16 14:38:01 +00:00
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free(fsc);
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1997-12-06 05:23:12 +00:00
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}
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/*
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* Called when a process has entered a system call. nargs is the
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* number of words, not number of arguments (a necessary distinction
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* in some cases). Note that if the STOPEVENT() code in i386/i386/trap.c
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* is ever changed these functions need to keep up.
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*/
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void
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2012-09-02 11:03:18 +00:00
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i386_syscall_entry(struct trussinfo *trussinfo, int nargs)
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{
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struct ptrace_io_desc iorequest;
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struct reg regs;
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2012-09-16 14:38:01 +00:00
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struct freebsd_syscall *fsc;
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2012-09-02 11:03:18 +00:00
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struct syscall *sc;
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2012-09-16 14:38:01 +00:00
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lwpid_t tid;
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2012-09-02 11:03:18 +00:00
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unsigned int parm_offset;
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int i, syscall_num;
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2012-09-16 14:38:01 +00:00
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tid = trussinfo->curthread->tid;
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2012-09-02 11:03:18 +00:00
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2012-09-16 14:38:01 +00:00
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if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
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2012-09-02 11:03:18 +00:00
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fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
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return;
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}
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parm_offset = regs.r_esp + sizeof(int);
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/*
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* FreeBSD has two special kinds of system call redirctions --
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* SYS_syscall, and SYS___syscall. The former is the old syscall()
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* routine, basically; the latter is for quad-aligned arguments.
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*/
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syscall_num = regs.r_eax;
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switch (syscall_num) {
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case SYS_syscall:
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2012-09-16 14:38:01 +00:00
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syscall_num = ptrace(PT_READ_D, tid, (caddr_t)parm_offset, 0);
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2012-09-02 11:03:18 +00:00
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parm_offset += sizeof(int);
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break;
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case SYS___syscall:
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2012-09-16 14:38:01 +00:00
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syscall_num = ptrace(PT_READ_D, tid, (caddr_t)parm_offset, 0);
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2012-09-02 11:03:18 +00:00
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parm_offset += sizeof(quad_t);
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break;
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}
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2012-09-16 14:38:01 +00:00
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fsc = alloc_fsc();
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if (fsc == NULL)
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return;
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fsc->number = syscall_num;
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fsc->name = (syscall_num < 0 || syscall_num >= nsyscalls) ?
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2012-09-02 11:03:18 +00:00
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NULL : syscallnames[syscall_num];
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2012-09-16 14:38:01 +00:00
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if (!fsc->name) {
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2012-09-02 11:03:18 +00:00
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fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n",
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syscall_num);
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}
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2012-09-16 14:38:01 +00:00
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if (fsc->name && (trussinfo->flags & FOLLOWFORKS) &&
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(strcmp(fsc->name, "fork") == 0 ||
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2015-07-24 16:57:13 +00:00
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strcmp(fsc->name, "pdfork") == 0 ||
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2012-09-16 14:38:01 +00:00
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strcmp(fsc->name, "rfork") == 0 ||
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strcmp(fsc->name, "vfork") == 0))
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2012-09-02 11:03:18 +00:00
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trussinfo->curthread->in_fork = 1;
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if (nargs == 0)
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return;
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2012-09-16 14:38:01 +00:00
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fsc->args = malloc((1 + nargs) * sizeof(unsigned long));
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2012-09-02 11:03:18 +00:00
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iorequest.piod_op = PIOD_READ_D;
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iorequest.piod_offs = (void *)parm_offset;
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2012-09-16 14:38:01 +00:00
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iorequest.piod_addr = fsc->args;
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2012-09-02 11:03:18 +00:00
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iorequest.piod_len = (1 + nargs) * sizeof(unsigned long);
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2012-09-16 14:38:01 +00:00
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ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
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2012-09-02 11:03:18 +00:00
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if (iorequest.piod_len == 0)
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return;
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sc = NULL;
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2012-09-16 14:38:01 +00:00
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if (fsc->name)
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sc = get_syscall(fsc->name);
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2012-09-02 11:03:18 +00:00
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if (sc)
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2012-09-16 14:38:01 +00:00
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fsc->nargs = sc->nargs;
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2012-09-02 11:03:18 +00:00
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else {
|
1997-12-06 05:23:12 +00:00
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#if DEBUG
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2012-09-02 11:03:18 +00:00
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fprintf(trussinfo->outfile, "unknown syscall %s -- setting "
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2012-09-16 14:38:01 +00:00
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"args to %d\n", fsc->name, nargs);
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1997-12-06 05:23:12 +00:00
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#endif
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2012-09-16 14:38:01 +00:00
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fsc->nargs = nargs;
|
2012-09-02 11:03:18 +00:00
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}
|
1997-12-06 05:23:12 +00:00
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2012-09-16 14:38:01 +00:00
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fsc->s_args = calloc(1, (1 + fsc->nargs) * sizeof(char *));
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fsc->sc = sc;
|
1997-12-06 05:23:12 +00:00
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2012-09-02 11:03:18 +00:00
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/*
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* At this point, we set up the system call arguments.
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* We ignore any OUT ones, however -- those are arguments that
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* are set by the system call, and so are probably meaningless
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* now. This doesn't currently support arguments that are
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* passed in *and* out, however.
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*/
|
1997-12-06 05:23:12 +00:00
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2012-09-16 14:38:01 +00:00
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if (fsc->name) {
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1997-12-06 05:23:12 +00:00
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#if DEBUG
|
2012-09-16 14:38:01 +00:00
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fprintf(stderr, "syscall %s(", fsc->name);
|
1997-12-06 05:23:12 +00:00
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#endif
|
2012-09-16 14:38:01 +00:00
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for (i = 0; i < fsc->nargs; i++) {
|
1997-12-06 05:23:12 +00:00
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#if DEBUG
|
2012-09-02 11:03:18 +00:00
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fprintf(stderr, "0x%x%s", sc ?
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2012-09-16 14:38:01 +00:00
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fsc->args[sc->args[i].offset] : fsc->args[i],
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i < (fsc->nargs - 1) ? "," : "");
|
1997-12-06 05:23:12 +00:00
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#endif
|
2012-09-02 11:03:18 +00:00
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if (sc && !(sc->args[i].type & OUT)) {
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2012-09-16 14:38:01 +00:00
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fsc->s_args[i] = print_arg(&sc->args[i],
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fsc->args, 0, trussinfo);
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2012-09-02 11:03:18 +00:00
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}
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}
|
1997-12-06 05:23:12 +00:00
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#if DEBUG
|
2012-09-02 11:03:18 +00:00
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fprintf(stderr, ")\n");
|
1997-12-06 05:23:12 +00:00
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#endif
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2012-09-02 11:03:18 +00:00
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}
|
1997-12-06 05:23:12 +00:00
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#if DEBUG
|
2012-09-02 11:03:18 +00:00
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fprintf(trussinfo->outfile, "\n");
|
1997-12-06 05:23:12 +00:00
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#endif
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|
2012-09-16 14:38:01 +00:00
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trussinfo->curthread->fsc = fsc;
|
1997-12-06 05:23:12 +00:00
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}
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/*
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|
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* And when the system call is done, we handle it here.
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* Currently, no attempt is made to ensure that the system calls
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* match -- this needs to be fixed (and is, in fact, why S_SCX includes
|
2010-10-13 20:08:02 +00:00
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* the system call number instead of, say, an error status).
|
1997-12-06 05:23:12 +00:00
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*/
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|
2003-11-09 03:48:13 +00:00
|
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long
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i386_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
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|
|
|
{
|
2012-09-02 11:03:18 +00:00
|
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struct reg regs;
|
2012-09-16 14:38:01 +00:00
|
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struct freebsd_syscall *fsc;
|
2012-09-02 11:03:18 +00:00
|
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|
struct syscall *sc;
|
2012-09-16 14:38:01 +00:00
|
|
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lwpid_t tid;
|
2012-09-02 11:03:18 +00:00
|
|
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long retval;
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int errorp, i;
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|
2012-09-16 14:38:01 +00:00
|
|
|
if (trussinfo->curthread->fsc == NULL)
|
2012-09-02 11:03:18 +00:00
|
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|
return (-1);
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|
2012-09-16 14:38:01 +00:00
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tid = trussinfo->curthread->tid;
|
2012-09-02 11:03:18 +00:00
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|
2012-09-16 14:38:01 +00:00
|
|
|
if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
|
2012-09-02 11:03:18 +00:00
|
|
|
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
|
|
|
|
return (-1);
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|
|
|
}
|
|
|
|
|
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|
|
retval = regs.r_eax;
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|
|
|
errorp = !!(regs.r_eflags & PSL_C);
|
|
|
|
|
1997-12-06 05:23:12 +00:00
|
|
|
/*
|
2012-09-02 11:03:18 +00:00
|
|
|
* This code, while simpler than the initial versions I used, could
|
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|
* stand some significant cleaning.
|
1997-12-06 05:23:12 +00:00
|
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|
*/
|
2012-09-02 11:03:18 +00:00
|
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|
2012-09-16 14:38:01 +00:00
|
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|
fsc = trussinfo->curthread->fsc;
|
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|
|
sc = fsc->sc;
|
2012-09-02 11:03:18 +00:00
|
|
|
if (!sc) {
|
2012-09-16 14:38:01 +00:00
|
|
|
for (i = 0; i < fsc->nargs; i++)
|
|
|
|
asprintf(&fsc->s_args[i], "0x%lx", fsc->args[i]);
|
2012-09-02 11:03:18 +00:00
|
|
|
} else {
|
|
|
|
/*
|
|
|
|
* Here, we only look for arguments that have OUT masked in --
|
|
|
|
* otherwise, they were handled in the syscall_entry function.
|
|
|
|
*/
|
|
|
|
for (i = 0; i < sc->nargs; i++) {
|
|
|
|
char *temp;
|
2015-08-19 20:02:03 +00:00
|
|
|
|
2012-09-02 11:03:18 +00:00
|
|
|
if (sc->args[i].type & OUT) {
|
|
|
|
/*
|
|
|
|
* If an error occurred, then don't bother
|
|
|
|
* getting the data; it may not be valid.
|
|
|
|
*/
|
|
|
|
if (errorp) {
|
|
|
|
asprintf(&temp, "0x%lx",
|
2012-09-16 14:38:01 +00:00
|
|
|
fsc->args[sc->args[i].offset]);
|
2012-09-02 11:03:18 +00:00
|
|
|
} else {
|
|
|
|
temp = print_arg(&sc->args[i],
|
2012-09-16 14:38:01 +00:00
|
|
|
fsc->args, retval, trussinfo);
|
2012-09-02 11:03:18 +00:00
|
|
|
}
|
2012-09-16 14:38:01 +00:00
|
|
|
fsc->s_args[i] = temp;
|
2012-09-02 11:03:18 +00:00
|
|
|
}
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2012-09-16 14:38:01 +00:00
|
|
|
if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
|
|
|
|
strcmp(fsc->name, "exit") == 0))
|
2012-09-02 11:03:18 +00:00
|
|
|
trussinfo->curthread->in_syscall = 1;
|
|
|
|
|
|
|
|
/*
|
|
|
|
* It would probably be a good idea to merge the error handling,
|
|
|
|
* but that complicates things considerably.
|
|
|
|
*/
|
|
|
|
|
2012-09-16 14:38:01 +00:00
|
|
|
print_syscall_ret(trussinfo, fsc->name, fsc->nargs, fsc->s_args, errorp,
|
|
|
|
retval, fsc->sc);
|
|
|
|
free_fsc(fsc);
|
2012-09-02 11:03:18 +00:00
|
|
|
|
|
|
|
return (retval);
|
1997-12-06 05:23:12 +00:00
|
|
|
}
|