svn commit: r247975 - in head/usr.bin: . truss
Olivier Houchard
cognet at FreeBSD.org
Thu Mar 7 23:44:36 UTC 2013
Author: cognet
Date: Thu Mar 7 23:44:35 2013
New Revision: 247975
URL: http://svnweb.freebsd.org/changeset/base/247975
Log:
Add arm bits to truss.
Added:
head/usr.bin/truss/arm-fbsd.c (contents, props changed)
Modified:
head/usr.bin/Makefile.arm
head/usr.bin/truss/extern.h
head/usr.bin/truss/main.c
Modified: head/usr.bin/Makefile.arm
==============================================================================
--- head/usr.bin/Makefile.arm Thu Mar 7 23:44:02 2013 (r247974)
+++ head/usr.bin/Makefile.arm Thu Mar 7 23:44:35 2013 (r247975)
@@ -1,3 +1,2 @@
# $FreeBSD$
-SUBDIR:= ${SUBDIR:Ntruss}
Added: head/usr.bin/truss/arm-fbsd.c
==============================================================================
--- /dev/null 00:00:00 1970 (empty, because file is newly added)
+++ head/usr.bin/truss/arm-fbsd.c Thu Mar 7 23:44:35 2013 (r247975)
@@ -0,0 +1,369 @@
+/*
+ * 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);
+}
Modified: head/usr.bin/truss/extern.h
==============================================================================
--- head/usr.bin/truss/extern.h Thu Mar 7 23:44:02 2013 (r247974)
+++ head/usr.bin/truss/extern.h Thu Mar 7 23:44:35 2013 (r247975)
@@ -37,6 +37,10 @@ extern void restore_proc(int);
extern void waitevent(struct trussinfo *);
extern const char *ioctlname(unsigned long val);
extern char *strsig(int sig);
+#ifdef __arm__
+extern void arm_syscall_entry(struct trussinfo *, int);
+extern long arm_syscall_exit(struct trussinfo *, int);
+#endif
#ifdef __amd64__
extern void amd64_syscall_entry(struct trussinfo *, int);
extern long amd64_syscall_exit(struct trussinfo *, int);
Modified: head/usr.bin/truss/main.c
==============================================================================
--- head/usr.bin/truss/main.c Thu Mar 7 23:44:02 2013 (r247974)
+++ head/usr.bin/truss/main.c Thu Mar 7 23:44:35 2013 (r247975)
@@ -79,6 +79,9 @@ static struct ex_types {
void (*enter_syscall)(struct trussinfo *, int);
long (*exit_syscall)(struct trussinfo *, int);
} ex_types[] = {
+#ifdef __arm__
+ { "FreeBSD ELF32", arm_syscall_entry, arm_syscall_exit },
+#endif
#ifdef __amd64__
{ "FreeBSD ELF64", amd64_syscall_entry, amd64_syscall_exit },
{ "FreeBSD ELF32", amd64_fbsd32_syscall_entry, amd64_fbsd32_syscall_exit },
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