316 lines
8.7 KiB
C
316 lines
8.7 KiB
C
/*
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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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#ifndef lint
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* not lint */
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/*
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* Linux/i386-specific system call handling. Given how much of this code
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* is taken from the freebsd equivalent, I can probably put even more of
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* it in support routines that can be used by any personality support.
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*/
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#include <sys/types.h>
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#include <sys/ptrace.h>
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#include <machine/reg.h>
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#include <machine/psl.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 "truss.h"
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#include "syscall.h"
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#include "extern.h"
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static int cpid = -1;
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#include "linux_syscalls.h"
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static int nsyscalls =
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sizeof(linux_syscallnames) / sizeof(linux_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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static struct linux_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[5];
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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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} fsc;
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/* Clear up and free parts of the fsc structure. */
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static __inline void
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clear_fsc(void) {
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if (fsc.s_args) {
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int i;
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for (i = 0; i < fsc.nargs; i++)
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if (fsc.s_args[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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memset(&fsc, 0, sizeof(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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i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) {
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struct reg regs;
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int syscall_num;
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int i;
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struct syscall *sc;
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cpid = trussinfo->curthread->tid;
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clear_fsc();
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if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0)
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{
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fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
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return;
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}
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syscall_num = regs.r_eax;
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fsc.number = syscall_num;
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fsc.name =
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(syscall_num < 0 || syscall_num >= nsyscalls) ? NULL : linux_syscallnames[syscall_num];
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if (!fsc.name) {
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fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n", syscall_num);
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}
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if (fsc.name && (trussinfo->flags & FOLLOWFORKS)
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&& ((!strcmp(fsc.name, "linux_fork")
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|| !strcmp(fsc.name, "linux_vfork"))))
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{
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trussinfo->curthread->in_fork = 1;
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}
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if (nargs == 0)
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return;
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/*
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* Linux passes syscall arguments in registers, not
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* on the stack. Fortunately, we've got access to the
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* register set. Note that we don't bother checking the
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* number of arguments. And what does linux do for syscalls
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* that have more than five arguments?
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*/
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fsc.args[0] = regs.r_ebx;
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fsc.args[1] = regs.r_ecx;
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fsc.args[2] = regs.r_edx;
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fsc.args[3] = regs.r_esi;
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fsc.args[4] = regs.r_edi;
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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 args to %d\n",
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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",
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sc
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? fsc.args[sc->args[i].offset]
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: 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], 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 &&
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(!strcmp(fsc.name, "linux_execve") || !strcmp(fsc.name, "exit"))) {
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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, "linux_execve")) {
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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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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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return;
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}
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/*
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* Linux syscalls return negative errno's, we do positive and map them
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*/
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const int bsd_to_linux_errno[] = {
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-0, -1, -2, -3, -4, -5, -6, -7, -8, -9,
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-10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
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-20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
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-30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
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-90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
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-100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
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-110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
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-116, -66, -6, -6, -6, -6, -6, -37, -38, -9,
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-6,
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};
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long
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i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused)
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{
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struct reg regs;
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long retval;
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int i;
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int errorp;
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struct syscall *sc;
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if (fsc.name == NULL)
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return (-1);
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cpid = trussinfo->curthread->tid;
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if (ptrace(PT_GETREGS, cpid, (caddr_t)®s, 0) < 0)
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{
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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_eax;
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errorp = !!(regs.r_eflags & PSL_C);
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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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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, than don't bothe getting the data;
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* it may not be valid.
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*/
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if (errorp)
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asprintf(&temp, "0x%lx", fsc.args[sc->args[i].offset]);
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else
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temp = print_arg(&sc->args[i], fsc.args, retval, trussinfo);
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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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/*
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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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if (errorp) {
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for (i = 0; (size_t)i < sizeof(bsd_to_linux_errno) / sizeof(int); i++)
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if (retval == bsd_to_linux_errno[i])
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break;
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}
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if (fsc.name != NULL &&
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(!strcmp(fsc.name, "linux_execve") || !strcmp(fsc.name, "exit"))) {
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trussinfo->curthread->in_syscall = 1;
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}
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print_syscall_ret(trussinfo, fsc.name, fsc.nargs, fsc.s_args, errorp,
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errorp ? i : retval, fsc.sc);
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clear_fsc();
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return (retval);
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}
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