Add arm bits to truss.

usr.bin/Makefile.arm

@@ -1,3 +1,2 @@
 # $FreeBSD$
 
-SUBDIR:=	${SUBDIR:Ntruss}

usr.bin/truss/arm-fbsd.c

@@ -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)&regs, 0) < 0) {
+		fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
+		return;
+	}
+	ap = &regs.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)&regs, 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);
+}

usr.bin/truss/extern.h

@@ -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);

usr.bin/truss/main.c

@@ -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 },