370 lines
9.8 KiB
C
370 lines
9.8 KiB
C
/*
|
|
* Copyright 1997 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.
|
|
* 3. All advertising materials mentioning features or use of this software
|
|
* must display the following acknowledgement:
|
|
* This product includes software developed by Sean Eric Fagan
|
|
* 4. Neither the name of the author may be used to endorse or promote
|
|
* products derived from this software without specific prior written
|
|
* permission.
|
|
*
|
|
* 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.
|
|
*/
|
|
|
|
/*
|
|
* FreeBSD/arm-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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
#include <sys/types.h>
|
|
#include <sys/ptrace.h>
|
|
#include <sys/syscall.h>
|
|
|
|
#include <machine/reg.h>
|
|
#include <machine/armreg.h>
|
|
#include <machine/ucontext.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 <err.h>
|
|
|
|
#include "truss.h"
|
|
#include "syscall.h"
|
|
#include "extern.h"
|
|
|
|
#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.
|
|
*/
|
|
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 */
|
|
};
|
|
|
|
static struct freebsd_syscall *
|
|
alloc_fsc(void)
|
|
{
|
|
|
|
return (malloc(sizeof(struct freebsd_syscall)));
|
|
}
|
|
|
|
/* Clear up and free parts of the fsc structure. */
|
|
static void
|
|
free_fsc(struct freebsd_syscall *fsc)
|
|
{
|
|
int i;
|
|
|
|
free(fsc->args);
|
|
if (fsc->s_args) {
|
|
for (i = 0; i < fsc->nargs; i++)
|
|
free(fsc->s_args[i]);
|
|
free(fsc->s_args);
|
|
}
|
|
free(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 i386/i386/trap.c
|
|
* is ever changed these functions need to keep up.
|
|
*/
|
|
|
|
void
|
|
arm_syscall_entry(struct trussinfo *trussinfo, int nargs)
|
|
{
|
|
struct ptrace_io_desc iorequest;
|
|
struct reg regs;
|
|
struct freebsd_syscall *fsc;
|
|
struct syscall *sc;
|
|
lwpid_t tid;
|
|
int i, syscall_num;
|
|
register_t *ap;
|
|
|
|
tid = trussinfo->curthread->tid;
|
|
|
|
if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
|
|
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
|
|
return;
|
|
}
|
|
ap = ®s.r[0];
|
|
|
|
/*
|
|
* FreeBSD has two special kinds of system call redirctions --
|
|
* SYS_syscall, and SYS___syscall. The former is the old syscall()
|
|
* routine, basically; the latter is for quad-aligned arguments.
|
|
*/
|
|
#ifdef __ARM_EABI__
|
|
syscall_num = regs.r[7];
|
|
#else
|
|
if ((syscall_num = ptrace(PT_READ_I, tid,
|
|
(caddr_t)(regs.r[_REG_PC] - INSN_SIZE), 0)) == -1) {
|
|
fprintf(trussinfo->outfile, "-- CANNOT READ PC --\n");
|
|
return;
|
|
}
|
|
syscall_num = syscall_num & 0x000fffff;
|
|
#endif
|
|
switch (syscall_num) {
|
|
case SYS_syscall:
|
|
syscall_num = *ap++;
|
|
nargs--;
|
|
break;
|
|
case SYS___syscall:
|
|
syscall_num = ap[_QUAD_LOWWORD];
|
|
ap += 2;
|
|
nargs -= 2;
|
|
break;
|
|
}
|
|
|
|
fsc = alloc_fsc();
|
|
if (fsc == NULL)
|
|
return;
|
|
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") == 0 ||
|
|
strcmp(fsc->name, "rfork") == 0 ||
|
|
strcmp(fsc->name, "vfork") == 0))
|
|
trussinfo->curthread->in_fork = 1;
|
|
|
|
if (nargs == 0)
|
|
return;
|
|
|
|
fsc->args = malloc((1 + nargs) * sizeof(unsigned long));
|
|
switch (nargs) {
|
|
default:
|
|
/*
|
|
* The OS doesn't seem to allow more than 10 words of
|
|
* parameters (yay!). So we shouldn't be here.
|
|
*/
|
|
warn("More than 10 words (%d) of arguments!\n", nargs);
|
|
break;
|
|
case 10:
|
|
case 9:
|
|
case 8:
|
|
case 7:
|
|
case 6:
|
|
case 5:
|
|
/*
|
|
* If there are 7-10 words of arguments, they are placed
|
|
* on the stack, as is normal for other processors.
|
|
* The fall-through for all of these is deliberate!!!
|
|
*/
|
|
// XXX BAD constant used here
|
|
iorequest.piod_op = PIOD_READ_D;
|
|
iorequest.piod_offs = (void *)(regs.r[_REG_SP] +
|
|
4 * sizeof(uint32_t));
|
|
iorequest.piod_addr = &fsc->args[4];
|
|
iorequest.piod_len = (nargs - 4) * sizeof(fsc->args[0]);
|
|
ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
|
|
if (iorequest.piod_len == 0)
|
|
return;
|
|
case 4: fsc->args[3] = ap[3];
|
|
case 3: fsc->args[2] = ap[2];
|
|
case 2: fsc->args[1] = ap[1];
|
|
case 1: fsc->args[0] = ap[0];
|
|
case 0: break;
|
|
}
|
|
|
|
sc = NULL;
|
|
if (fsc->name)
|
|
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 = calloc(1, (1 + 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 != NULL && (strcmp(fsc->name, "execve") == 0 ||
|
|
strcmp(fsc->name, "exit") == 0)) {
|
|
/*
|
|
* XXX
|
|
* This could be done in a more general
|
|
* manner but it still wouldn't be very pretty.
|
|
*/
|
|
if (strcmp(fsc->name, "execve") == 0) {
|
|
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;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
trussinfo->curthread->fsc = fsc;
|
|
}
|
|
|
|
/*
|
|
* 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 system call number instead of, say, an error status).
|
|
*/
|
|
|
|
long
|
|
arm_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
|
|
{
|
|
struct reg regs;
|
|
struct freebsd_syscall *fsc;
|
|
struct syscall *sc;
|
|
lwpid_t tid;
|
|
long retval;
|
|
int errorp, i;
|
|
|
|
if (trussinfo->curthread->fsc == NULL)
|
|
return (-1);
|
|
|
|
tid = trussinfo->curthread->tid;
|
|
|
|
if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
|
|
fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
|
|
return (-1);
|
|
}
|
|
|
|
retval = regs.r[0];
|
|
errorp = !!(regs.r_cpsr & PSR_C_bit);
|
|
|
|
/*
|
|
* This code, while simpler than the initial versions I used, could
|
|
* stand some significant cleaning.
|
|
*/
|
|
|
|
fsc = trussinfo->curthread->fsc;
|
|
sc = fsc->sc;
|
|
if (!sc) {
|
|
for (i = 0; i < fsc->nargs; i++)
|
|
asprintf(&fsc->s_args[i], "0x%lx", fsc->args[i]);
|
|
} 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;
|
|
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",
|
|
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") == 0 ||
|
|
strcmp(fsc->name, "exit") == 0))
|
|
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, fsc->sc);
|
|
free_fsc(fsc);
|
|
|
|
return (retval);
|
|
}
|