Add arm bits to truss.
This commit is contained in:
Olivier Houchard
parent
4b52061e17
commit
57fb38ba93
@ -1,3 +1,2 @@
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# $FreeBSD$
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SUBDIR:= ${SUBDIR:Ntruss}
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369
usr.bin/truss/arm-fbsd.c
Normal file
369
usr.bin/truss/arm-fbsd.c
Normal file
@ -0,0 +1,369 @@
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/*
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* Copyright 1997 Sean Eric Fagan
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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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/*
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* FreeBSD/arm-specific system call handling. This is probably the most
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <sys/syscall.h>
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#include <machine/reg.h>
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#include <machine/armreg.h>
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#include <machine/ucontext.h>
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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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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <err.h>
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#include "truss.h"
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#include "syscall.h"
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#include "extern.h"
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#include "syscalls.h"
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static int nsyscalls = sizeof(syscallnames) / sizeof(syscallnames[0]);
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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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struct freebsd_syscall {
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struct syscall *sc;
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const char *name;
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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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};
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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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/* Clear up and free parts of the fsc structure. */
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static void
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free_fsc(struct freebsd_syscall *fsc)
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{
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int i;
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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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}
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free(fsc);
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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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arm_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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struct freebsd_syscall *fsc;
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struct syscall *sc;
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lwpid_t tid;
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int i, syscall_num;
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register_t *ap;
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tid = trussinfo->curthread->tid;
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if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
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fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
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return;
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}
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ap = ®s.r[0];
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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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#ifdef __ARM_EABI__
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syscall_num = regs.r[7];
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#else
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if ((syscall_num = ptrace(PT_READ_I, tid,
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(caddr_t)(regs.r[_REG_PC] - INSN_SIZE), 0)) == -1) {
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fprintf(trussinfo->outfile, "-- CANNOT READ PC --\n");
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return;
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}
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syscall_num = syscall_num & 0x000fffff;
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#endif
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switch (syscall_num) {
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case SYS_syscall:
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syscall_num = *ap++;
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nargs--;
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break;
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case SYS___syscall:
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syscall_num = ap[_QUAD_LOWWORD];
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ap += 2;
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nargs -= 2;
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break;
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}
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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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NULL : syscallnames[syscall_num];
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if (!fsc->name) {
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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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if (fsc->name && (trussinfo->flags & FOLLOWFORKS) &&
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(strcmp(fsc->name, "fork") == 0 ||
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strcmp(fsc->name, "rfork") == 0 ||
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strcmp(fsc->name, "vfork") == 0))
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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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fsc->args = malloc((1 + nargs) * sizeof(unsigned long));
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switch (nargs) {
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default:
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/*
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* The OS doesn't seem to allow more than 10 words of
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* parameters (yay!). So we shouldn't be here.
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*/
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warn("More than 10 words (%d) of arguments!\n", nargs);
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break;
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case 10:
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case 9:
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case 8:
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case 7:
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case 6:
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case 5:
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/*
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* If there are 7-10 words of arguments, they are placed
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* on the stack, as is normal for other processors.
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* The fall-through for all of these is deliberate!!!
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*/
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// XXX BAD constant used here
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iorequest.piod_op = PIOD_READ_D;
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iorequest.piod_offs = (void *)(regs.r[_REG_SP] +
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4 * sizeof(uint32_t));
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iorequest.piod_addr = &fsc->args[4];
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iorequest.piod_len = (nargs - 4) * sizeof(fsc->args[0]);
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ptrace(PT_IO, tid, (caddr_t)&iorequest, 0);
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if (iorequest.piod_len == 0)
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return;
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case 4: fsc->args[3] = ap[3];
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case 3: fsc->args[2] = ap[2];
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case 2: fsc->args[1] = ap[1];
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case 1: fsc->args[0] = ap[0];
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case 0: break;
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}
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sc = NULL;
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if (fsc->name)
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sc = get_syscall(fsc->name);
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if (sc)
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fsc->nargs = sc->nargs;
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else {
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#if DEBUG
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fprintf(trussinfo->outfile, "unknown syscall %s -- setting "
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"args to %d\n", fsc->name, nargs);
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#endif
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fsc->nargs = nargs;
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}
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fsc->s_args = calloc(1, (1 + fsc->nargs) * sizeof(char *));
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fsc->sc = sc;
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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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*/
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if (fsc->name) {
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#if DEBUG
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fprintf(stderr, "syscall %s(", fsc->name);
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#endif
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for (i = 0; i < fsc->nargs; i++) {
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#if DEBUG
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fprintf(stderr, "0x%x%s", sc ?
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fsc->args[sc->args[i].offset] : fsc->args[i],
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i < (fsc->nargs - 1) ? "," : "");
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#endif
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if (sc && !(sc->args[i].type & OUT)) {
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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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}
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}
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#if DEBUG
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fprintf(stderr, ")\n");
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#endif
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}
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#if DEBUG
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fprintf(trussinfo->outfile, "\n");
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#endif
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if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
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strcmp(fsc->name, "exit") == 0)) {
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/*
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* XXX
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* This could be done in a more general
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* manner but it still wouldn't be very pretty.
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*/
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if (strcmp(fsc->name, "execve") == 0) {
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if ((trussinfo->flags & EXECVEARGS) == 0) {
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if (fsc->s_args[1]) {
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free(fsc->s_args[1]);
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fsc->s_args[1] = NULL;
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}
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}
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if ((trussinfo->flags & EXECVEENVS) == 0) {
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if (fsc->s_args[2]) {
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free(fsc->s_args[2]);
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fsc->s_args[2] = NULL;
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}
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}
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}
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}
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trussinfo->curthread->fsc = fsc;
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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
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* the system call number instead of, say, an error status).
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*/
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long
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arm_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
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{
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struct reg regs;
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struct freebsd_syscall *fsc;
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struct syscall *sc;
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lwpid_t tid;
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long retval;
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int errorp, i;
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if (trussinfo->curthread->fsc == NULL)
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return (-1);
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tid = trussinfo->curthread->tid;
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if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
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fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
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return (-1);
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}
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retval = regs.r[0];
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errorp = !!(regs.r_cpsr & PSR_C_bit);
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/*
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* This code, while simpler than the initial versions I used, could
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* stand some significant cleaning.
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*/
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fsc = trussinfo->curthread->fsc;
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sc = fsc->sc;
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if (!sc) {
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for (i = 0; i < fsc->nargs; i++)
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asprintf(&fsc->s_args[i], "0x%lx", fsc->args[i]);
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} else {
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/*
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* Here, we only look for arguments that have OUT masked in --
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* otherwise, they were handled in the syscall_entry function.
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*/
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for (i = 0; i < sc->nargs; i++) {
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char *temp;
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if (sc->args[i].type & OUT) {
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/*
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* If an error occurred, then don't bother
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* getting the data; it may not be valid.
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*/
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if (errorp) {
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asprintf(&temp, "0x%lx",
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fsc->args[sc->args[i].offset]);
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} else {
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temp = print_arg(&sc->args[i],
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fsc->args, retval, trussinfo);
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}
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fsc->s_args[i] = temp;
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}
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}
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}
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if (fsc->name != NULL && (strcmp(fsc->name, "execve") == 0 ||
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strcmp(fsc->name, "exit") == 0))
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trussinfo->curthread->in_syscall = 1;
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/*
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* It would probably be a good idea to merge the error handling,
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* but that complicates things considerably.
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*/
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print_syscall_ret(trussinfo, fsc->name, fsc->nargs, fsc->s_args, errorp,
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retval, fsc->sc);
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free_fsc(fsc);
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return (retval);
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}
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@ -37,6 +37,10 @@ extern void restore_proc(int);
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extern void waitevent(struct trussinfo *);
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extern const char *ioctlname(unsigned long val);
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extern char *strsig(int sig);
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#ifdef __arm__
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extern void arm_syscall_entry(struct trussinfo *, int);
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extern long arm_syscall_exit(struct trussinfo *, int);
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#endif
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#ifdef __amd64__
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extern void amd64_syscall_entry(struct trussinfo *, int);
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extern long amd64_syscall_exit(struct trussinfo *, int);
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@ -79,6 +79,9 @@ static struct ex_types {
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void (*enter_syscall)(struct trussinfo *, int);
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long (*exit_syscall)(struct trussinfo *, int);
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} ex_types[] = {
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#ifdef __arm__
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{ "FreeBSD ELF32", arm_syscall_entry, arm_syscall_exit },
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#endif
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#ifdef __amd64__
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{ "FreeBSD ELF64", amd64_syscall_entry, amd64_syscall_exit },
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{ "FreeBSD ELF32", amd64_fbsd32_syscall_entry, amd64_fbsd32_syscall_exit },
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