254 lines
6.7 KiB
C
254 lines
6.7 KiB
C
/*
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* Copryight 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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/*
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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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/*
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* $Id: i386-linux.c,v 1.1 1997/12/06 05:22:54 sef Exp $
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*/
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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 <errno.h>
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#include <err.h>
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#include <signal.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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#include <sys/pioctl.h>
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#include <machine/reg.h>
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#include <machine/psl.h>
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#include "syscall.h"
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static int fd = -1;
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static int cpid = -1;
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extern int Procfd;
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extern FILE *outfile;
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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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/* See the comment in i386-fbsd.c about this structure. */
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static struct linux_syscall {
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struct syscall *sc;
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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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} lsc;
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static inline void
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clear_lsc() {
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if (lsc.s_args) {
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int i;
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for (i = 0; i < lsc.nargs; i++)
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if (lsc.s_args[i])
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free(lsc.s_args[i]);
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free(lsc.s_args);
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}
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memset(&lsc, 0, sizeof(lsc));
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}
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void
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i386_linux_syscall_entry(int pid, int nargs) {
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char buf[32];
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struct reg regs = { 0 };
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int syscall;
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int i;
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int memfd;
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struct syscall *sc;
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if (fd == -1 || pid != cpid) {
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sprintf(buf, "/proc/%d/regs", pid);
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fd = open(buf, O_RDWR);
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if (fd == -1) {
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fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
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return;
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}
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cpid = pid;
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}
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clear_lsc();
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lseek(fd, 0L, 0);
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i = read(fd, ®s, sizeof(regs));
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syscall = regs.r_eax;
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lsc.number = syscall;
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lsc.name =
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(syscall < 0 || syscall > nsyscalls) ? NULL : linux_syscallnames[syscall];
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if (!lsc.name) {
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fprintf (outfile, "-- UNKNOWN SYSCALL %d\n", syscall);
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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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lsc.args[0] = regs.r_ebx;
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lsc.args[1] = regs.r_ecx;
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lsc.args[2] = regs.r_edx;
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lsc.args[3] = regs.r_esi;
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lsc.args[4] = regs.r_edi;
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sc = get_syscall(lsc.name);
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if (sc) {
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lsc.nargs = sc->nargs;
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} else {
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#ifdef DEBUG
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fprintf(outfile, "unknown syscall %s -- setting args to %d\n",
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lsc.name, nargs);
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#endif
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lsc.nargs = nargs;
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}
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lsc.s_args = malloc((1+lsc.nargs) * sizeof(char*));
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memset(lsc.s_args, 0, lsc.nargs * sizeof(char*));
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lsc.sc = sc;
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if (lsc.name) {
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char *tmp;
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#ifdef DEBUG
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fprintf(stderr, "syscall %s(", lsc.name);
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#endif
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for (i = 0; i < lsc.nargs ; i++) {
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#ifdef DEBUG
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fprintf(stderr, "0x%x%s",
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sc ?
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lsc.args[sc->args[i].offset]
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: lsc.args[i],
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i < (lsc.nargs - 1) ? "," : "");
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#endif
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if (sc && !(sc->args[i].type & OUT)) {
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lsc.s_args[i] = print_arg(Procfd, &sc->args[i], lsc.args);
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}
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}
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#ifdef DEBUG
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fprintf(stderr, ")\n");
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#endif
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}
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if (!strcmp(lsc.name, "linux_execve") || !strcmp(lsc.name, "exit")) {
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print_syscall(outfile, lsc.name, lsc.nargs, lsc.s_args);
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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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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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void
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i386_linux_syscall_exit(int pid, int syscall) {
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char buf[32];
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struct reg regs;
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int 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 (fd == -1 || pid != cpid) {
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sprintf(buf, "/proc/%d/regs", pid);
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fd = open(buf, O_RDONLY);
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if (fd == -1) {
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fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
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return;
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}
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cpid = pid;
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}
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lseek(fd, 0L, 0);
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if (read(fd, ®s, sizeof(regs)) != sizeof(regs))
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return;
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retval = regs.r_eax;
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errorp = !!(regs.r_eflags & PSL_C);
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sc = lsc.sc;
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if (!sc) {
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for (i = 0; i < lsc.nargs; i++) {
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lsc.s_args[i] = malloc(12);
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sprintf(lsc.s_args[i], "0x%x", lsc.args[i]);
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}
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} else {
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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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if (errorp) {
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temp = malloc(12);
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sprintf(temp, "0x%x", lsc.args[sc->args[i].offset]);
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} else {
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temp = print_arg(Procfd, &sc->args[i], lsc.args);
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}
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lsc.s_args[i] = temp;
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}
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}
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}
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print_syscall(outfile, lsc.name, lsc.nargs, lsc.s_args);
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if (errorp) {
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for (i = 0; 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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fprintf(outfile, "errno %d '%s'\n", retval, strerror(i));
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} else {
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fprintf(outfile, "returns %d (0x%x)\n", retval, retval);
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}
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clear_lsc();
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return;
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}
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