2 * Copryight 1997 Sean Eric Fagan
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. All advertising materials mentioning features or use of this software
13 * must display the following acknowledgement:
14 * This product includes software developed by Sean Eric Fagan
15 * 4. Neither the name of the author may be used to endorse or promote
16 * products derived from this software without specific prior written
19 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * $FreeBSD: src/usr.bin/truss/i386-linux.c,v 1.7.2.4 2002/02/15 11:43:51 des Exp $
32 * $DragonFly: src/usr.bin/truss/i386-linux.c,v 1.5 2007/12/27 00:59:25 nth Exp $
36 * Linux/i386-specific system call handling. Given how much of this code
37 * is taken from the freebsd equivalent, I can probably put even more of
38 * it in support routines that can be used by any personality support.
41 #include <sys/types.h>
42 #include <sys/ioctl.h>
43 #include <sys/pioctl.h>
45 #include <machine/reg.h>
46 #include <machine/psl.h>
64 #include "linux_syscalls.h"
66 static int nsyscalls =
67 sizeof(linux_syscallnames) / sizeof(linux_syscallnames[0]);
69 /* See the comment in i386-fbsd.c about this structure. */
70 static struct linux_syscall {
74 unsigned long args[5];
75 int nargs; /* number of arguments -- *not* number of words! */
76 char **s_args; /* the printable arguments */
83 for (i = 0; i < lsc.nargs; i++)
88 memset(&lsc, 0, sizeof(lsc));
92 i386_linux_syscall_entry(int pid, int nargs) {
94 struct reg regs = { 0 };
99 if (fd == -1 || pid != cpid) {
100 asprintf(&buf, "%s/%d/regs", procfs_path, pid);
102 err(1, "Out of memory");
103 fd = open(buf, O_RDWR);
106 fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
114 i = read(fd, ®s, sizeof(regs));
115 syscall = regs.r_eax;
117 lsc.number = syscall;
119 (syscall < 0 || syscall >= nsyscalls) ? NULL : linux_syscallnames[syscall];
121 fprintf (outfile, "-- UNKNOWN SYSCALL %d\n", syscall);
128 * Linux passes syscall arguments in registers, not
129 * on the stack. Fortunately, we've got access to the
130 * register set. Note that we don't bother checking the
131 * number of arguments. And what does linux do for syscalls
132 * that have more than five arguments?
135 lsc.args[0] = regs.r_ebx;
136 lsc.args[1] = regs.r_ecx;
137 lsc.args[2] = regs.r_edx;
138 lsc.args[3] = regs.r_esi;
139 lsc.args[4] = regs.r_edi;
141 sc = get_syscall(lsc.name);
143 lsc.nargs = sc->nargs;
146 fprintf(outfile, "unknown syscall %s -- setting args to %d\n",
152 lsc.s_args = malloc((1+lsc.nargs) * sizeof(char*));
153 memset(lsc.s_args, 0, lsc.nargs * sizeof(char*));
159 fprintf(stderr, "syscall %s(", lsc.name);
161 for (i = 0; i < lsc.nargs ; i++) {
163 fprintf(stderr, "0x%x%s",
165 lsc.args[sc->args[i].offset]
167 i < (lsc.nargs - 1) ? "," : "");
169 if (sc && !(sc->args[i].type & OUT)) {
170 lsc.s_args[i] = print_arg(Procfd, &sc->args[i], lsc.args);
174 fprintf(stderr, ")\n");
178 if (!strcmp(lsc.name, "linux_execve") || !strcmp(lsc.name, "exit")) {
179 print_syscall(outfile, lsc.name, lsc.nargs, lsc.s_args);
186 * Linux syscalls return negative errno's, we do positive and map them
188 const int bsd_to_linux_errno[] = {
189 -0, -1, -2, -3, -4, -5, -6, -7, -8, -9,
190 -10, -35, -12, -13, -14, -15, -16, -17, -18, -19,
191 -20, -21, -22, -23, -24, -25, -26, -27, -28, -29,
192 -30, -31, -32, -33, -34, -11,-115,-114, -88, -89,
193 -90, -91, -92, -93, -94, -95, -96, -97, -98, -99,
194 -100,-101,-102,-103,-104,-105,-106,-107,-108,-109,
195 -110,-111, -40, -36,-112,-113, -39, -11, -87,-122,
196 -116, -66, -6, -6, -6, -6, -6, -37, -38, -9,
201 i386_linux_syscall_exit(int pid, int syscall) {
209 if (fd == -1 || pid != cpid) {
210 asprintf(&buf, "%s/%d/regs", procfs_path, pid);
212 err(1, "Out of memory");
213 fd = open(buf, O_RDONLY);
216 fprintf(outfile, "-- CANNOT READ REGISTERS --\n");
223 if (read(fd, ®s, sizeof(regs)) != sizeof(regs))
227 errorp = !!(regs.r_eflags & PSL_C);
231 for (i = 0; i < lsc.nargs; i++) {
232 lsc.s_args[i] = malloc(12);
233 sprintf(lsc.s_args[i], "0x%lx", lsc.args[i]);
236 for (i = 0; i < sc->nargs; i++) {
238 if (sc->args[i].type & OUT) {
241 sprintf(temp, "0x%lx", lsc.args[sc->args[i].offset]);
243 temp = print_arg(Procfd, &sc->args[i], lsc.args);
245 lsc.s_args[i] = temp;
250 for (i = 0; i < sizeof(bsd_to_linux_errno) / sizeof(int); i++)
251 if (retval == bsd_to_linux_errno[i])
254 print_syscall_ret(outfile, lsc.name, lsc.nargs, lsc.s_args, errorp,
255 errorp ? i : retval);