2c02627ff8
containing 64-bit arguments would have explicit padding. On 64-bit platforms there was no padding, so the dummy argument was not covering anything. On 32-bit platforms with weak alignment (i.e. i386) the 64-bit argument did not need to be aligned, so there too an aditional argument was introduced. On 32-bit platforms with strong alignment (i.e. PowerPC) the dummy argument in fact cover the padding. By elimininating the dummy argument, 64-bit platforms now have 1 argument less. This also applies to 32-bit platforms with weak alignment. On PowerPC this doesn't matter, because the padding is still there. We just don't "name" it. Deal with those 3 cases. Approved by: re (kensmith)
339 lines
9.3 KiB
C
339 lines
9.3 KiB
C
/*
|
|
* Copyright 2006 Peter Grehan <grehan@freebsd.org>
|
|
* Copryight 2005 Orlando Bassotto <orlando@break.net>
|
|
* Copryight 1998 Sean Eric Fagan
|
|
*
|
|
* 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.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
|
|
*/
|
|
|
|
#ifndef lint
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* FreeBSD/powerpc-specific system call handling. This is probably the most
|
|
* complex part of the entire truss program, although I've got lots of
|
|
* it handled relatively cleanly now. The system call names are generated
|
|
* automatically, thanks to /usr/src/sys/kern/syscalls.master. The
|
|
* names used for the various structures are confusing, I sadly admit.
|
|
*
|
|
* This file is almost nothing more than a slightly-edited i386-fbsd.c.
|
|
*/
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/ptrace.h>
|
|
#include <sys/syscall.h>
|
|
|
|
#include <machine/reg.h>
|
|
#include <machine/frame.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <time.h>
|
|
#include <unistd.h>
|
|
|
|
#include "truss.h"
|
|
#include "syscall.h"
|
|
#include "extern.h"
|
|
|
|
static int cpid = -1;
|
|
|
|
#include "syscalls.h"
|
|
|
|
static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
|
|
|
|
/*
|
|
* This is what this particular file uses to keep track of a system call.
|
|
* It is probably not quite sufficient -- I can probably use the same
|
|
* structure for the various syscall personalities, and I also probably
|
|
* need to nest system calls (for signal handlers).
|
|
*
|
|
* 'struct syscall' describes the system call; it may be NULL, however,
|
|
* if we don't know about this particular system call yet.
|
|
*/
|
|
static struct freebsd_syscall {
|
|
struct syscall *sc;
|
|
const char *name;
|
|
int number;
|
|
unsigned long *args;
|
|
int nargs; /* number of arguments -- *not* number of words! */
|
|
char **s_args; /* the printable arguments */
|
|
} fsc;
|
|
|
|
/* Clear up and free parts of the fsc structure. */
|
|
static __inline void
|
|
clear_fsc(void) {
|
|
if (fsc.args) {
|
|
free(fsc.args);
|
|
}
|
|
if (fsc.s_args) {
|
|
int i;
|
|
for (i = 0; i < fsc.nargs; i++)
|
|
if (fsc.s_args[i])
|
|
free(fsc.s_args[i]);
|
|
free(fsc.s_args);
|
|
}
|
|
memset(&fsc, 0, sizeof(fsc));
|
|
}
|
|
|
|
/*
|
|
* Called when a process has entered a system call. nargs is the
|
|
* number of words, not number of arguments (a necessary distinction
|
|
* in some cases). Note that if the STOPEVENT() code in powerpc/powerpc/trap.c
|
|
* is ever changed these functions need to keep up.
|
|
*/
|
|
|
|
void
|
|
powerpc_syscall_entry(struct trussinfo *trussinfo, int nargs) {
|
|
char buf[32];
|
|
struct reg regs;
|
|
void *args;
|
|
int syscall_num;
|
|
int i;
|
|
unsigned int regargs;
|
|
struct syscall *sc;
|
|
|
|
/* Account for a 64-bit argument with corresponding alignment. */
|
|
nargs += 2;
|
|
|
|
cpid = trussinfo->curthread->tid;
|
|
|
|
clear_fsc();
|
|
if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
|
|
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* FreeBSD has two special kinds of system call redirctions --
|
|
* SYS_syscall, and SYS___syscall. The former is the old syscall()
|
|
* routine, basicly; the latter is for quad-aligned arguments.
|
|
*/
|
|
regargs = NARGREG;
|
|
syscall_num = regs.fixreg[0];
|
|
args = ®s.fixreg[3];
|
|
if (syscall_num == SYS_syscall) {
|
|
args = ®s.fixreg[4];
|
|
regargs -= 1;
|
|
syscall_num = regs.fixreg[3];
|
|
} else if (syscall_num == SYS___syscall) {
|
|
args = ®s.fixreg[5];
|
|
regargs -= 2;
|
|
syscall_num = regs.fixreg[4];
|
|
}
|
|
|
|
fsc.number = syscall_num;
|
|
fsc.name =
|
|
(syscall_num < 0 || syscall_num > nsyscalls) ? NULL : syscallnames[syscall_num];
|
|
if (!fsc.name) {
|
|
fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
|
|
}
|
|
|
|
if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
|
|
&& ((!strcmp(fsc.name, "fork")
|
|
|| !strcmp(fsc.name, "rfork")
|
|
|| !strcmp(fsc.name, "vfork"))))
|
|
{
|
|
trussinfo->curthread->in_fork = 1;
|
|
}
|
|
|
|
if (nargs == 0)
|
|
return;
|
|
|
|
fsc.args = malloc((1+nargs) * sizeof(unsigned long));
|
|
|
|
if (nargs > regargs) {
|
|
struct ptrace_io_desc iorequest;
|
|
memmove(&fsc.args[0], args, regargs * sizeof(fsc.args[0]));
|
|
|
|
iorequest.piod_op = PIOD_READ_D;
|
|
iorequest.piod_offs = (void *)(regs.fixreg[1] + 8);
|
|
iorequest.piod_addr = &fsc.args[regargs];
|
|
iorequest.piod_len = (nargs - regargs) * sizeof(fsc.args[0]);
|
|
ptrace(PT_IO, cpid, (caddr_t)&iorequest, 0);
|
|
if (iorequest.piod_len == 0)
|
|
return;
|
|
} else {
|
|
memmove(&fsc.args[0], args, nargs * sizeof(fsc.args[0]));
|
|
}
|
|
|
|
sc = get_syscall(fsc.name);
|
|
if (sc) {
|
|
fsc.nargs = sc->nargs;
|
|
} else {
|
|
#if DEBUG
|
|
fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n",
|
|
fsc.name, nargs);
|
|
#endif
|
|
fsc.nargs = nargs;
|
|
}
|
|
|
|
fsc.s_args = malloc((1+fsc.nargs) * sizeof(char*));
|
|
memset(fsc.s_args, 0, fsc.nargs * sizeof(char*));
|
|
fsc.sc = sc;
|
|
|
|
/*
|
|
* At this point, we set up the system call arguments.
|
|
* We ignore any OUT ones, however -- those are arguments that
|
|
* are set by the system call, and so are probably meaningless
|
|
* now. This doesn't currently support arguments that are
|
|
* passed in *and* out, however.
|
|
*/
|
|
|
|
if (fsc.name) {
|
|
|
|
#if DEBUG
|
|
fprintf(stderr, "syscall %s(", fsc.name);
|
|
#endif
|
|
for (i = 0; i < fsc.nargs; i++) {
|
|
#if DEBUG
|
|
fprintf(stderr, "0x%x%s",
|
|
sc
|
|
? fsc.args[sc->args[i].offset]
|
|
: fsc.args[i],
|
|
i < (fsc.nargs - 1) ? "," : "");
|
|
#endif
|
|
if (sc && !(sc->args[i].type & OUT)) {
|
|
fsc.s_args[i] = print_arg(&sc->args[i], fsc.args, 0, trussinfo);
|
|
}
|
|
}
|
|
#if DEBUG
|
|
fprintf(stderr, ")\n");
|
|
#endif
|
|
}
|
|
|
|
#if DEBUG
|
|
fprintf(trussinfo->outfile, "\n");
|
|
#endif
|
|
|
|
if (fsc.name && (!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
|
|
|
|
/* XXX
|
|
* This could be done in a more general
|
|
* manner but it still wouldn't be very pretty.
|
|
*/
|
|
if (!strcmp(fsc.name, "execve")) {
|
|
if ((trussinfo->flags & EXECVEARGS) == 0)
|
|
if (fsc.s_args[1]) {
|
|
free(fsc.s_args[1]);
|
|
fsc.s_args[1] = NULL;
|
|
}
|
|
if ((trussinfo->flags & EXECVEENVS) == 0)
|
|
if (fsc.s_args[2]) {
|
|
free(fsc.s_args[2]);
|
|
fsc.s_args[2] = NULL;
|
|
}
|
|
}
|
|
}
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* And when the system call is done, we handle it here.
|
|
* Currently, no attempt is made to ensure that the system calls
|
|
* match -- this needs to be fixed (and is, in fact, why S_SCX includes
|
|
* the sytem call number instead of, say, an error status).
|
|
*/
|
|
|
|
long
|
|
powerpc_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
|
|
{
|
|
struct reg regs;
|
|
long retval;
|
|
int i;
|
|
int errorp;
|
|
struct syscall *sc;
|
|
|
|
if (fsc.name == NULL)
|
|
return (-1);
|
|
|
|
cpid = trussinfo->curthread->tid;
|
|
|
|
if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0) {
|
|
fprintf(trussinfo->outfile, "\n");
|
|
return (-1);
|
|
}
|
|
retval = regs.fixreg[3];
|
|
errorp = !!(regs.cr & 0x10000000);
|
|
|
|
/*
|
|
* This code, while simpler than the initial versions I used, could
|
|
* stand some significant cleaning.
|
|
*/
|
|
|
|
sc = fsc.sc;
|
|
if (!sc) {
|
|
for (i = 0; i < fsc.nargs; i++)
|
|
asprintf(&fsc.s_args[i], "0x%lx", fsc.args[i]);
|
|
} else {
|
|
/*
|
|
* On 32-bit big-endian, the low word of a 64-bit return is
|
|
* in the greater address. Switch to this. XXX note that
|
|
* print_syscall_ret can't handle 64-bit return values (llseek)
|
|
*/
|
|
if (sc->ret_type == 2)
|
|
retval = regs.fixreg[4];
|
|
|
|
/*
|
|
* 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;
|
|
if (sc->args[i].type & OUT) {
|
|
/*
|
|
* If an error occurred, than don't bothe getting the data;
|
|
* it may not be valid.
|
|
*/
|
|
if (errorp)
|
|
asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
|
|
else
|
|
temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo);
|
|
fsc.s_args[i] = temp;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (fsc.name != NULL &&
|
|
(!strcmp(fsc.name, "execve") || !strcmp(fsc.name, "exit"))) {
|
|
trussinfo->curthread->in_syscall = 1;
|
|
}
|
|
|
|
|
|
/*
|
|
* It would probably be a good idea to merge the error handling,
|
|
* but that complicates things considerably.
|
|
*/
|
|
|
|
print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp, retval);
|
|
clear_fsc();
|
|
|
|
return (retval);
|
|
}
|