/* * Copryight 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: src/usr.bin/truss/i386-linux.c,v 1.7.2.4 2002/02/15 11:43:51 des Exp $ * $DragonFly: src/usr.bin/truss/i386-linux.c,v 1.5 2007/12/27 00:59:25 nth Exp $ */ /* * Linux/i386-specific system call handling. Given how much of this code * is taken from the freebsd equivalent, I can probably put even more of * it in support routines that can be used by any personality support. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "truss.h" #include "extern.h" #include "syscall.h" static int fd = -1; static int cpid = -1; #include "linux_syscalls.h" static int nsyscalls = sizeof(linux_syscallnames) / sizeof(linux_syscallnames[0]); /* See the comment in i386-fbsd.c about this structure. */ static struct linux_syscall { struct syscall *sc; const char *name; int number; unsigned long args[5]; int nargs; /* number of arguments -- *not* number of words! */ char **s_args; /* the printable arguments */ } lsc; static inline void clear_lsc(void) { if (lsc.s_args) { int i; for (i = 0; i < lsc.nargs; i++) if (lsc.s_args[i]) free(lsc.s_args[i]); free(lsc.s_args); } memset(&lsc, 0, sizeof(lsc)); } void i386_linux_syscall_entry(struct trussinfo *trussinfo, int nargs) { char *buf; struct reg regs = { .r_err = 0 }; int syscall_num; int i; struct syscall *sc; if (fd == -1 || trussinfo->pid != cpid) { asprintf(&buf, "%s/%d/regs", procfs_path, trussinfo->pid); if (buf == NULL) err(1, "Out of memory"); fd = open(buf, O_RDWR); free(buf); if (fd == -1) { fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); return; } cpid = trussinfo->pid; } clear_lsc(); lseek(fd, 0L, 0); i = read(fd, ®s, sizeof(regs)); syscall_num = regs.r_eax; lsc.number = syscall_num; lsc.name = (syscall_num < 0 || syscall_num >= nsyscalls) ? NULL : linux_syscallnames[syscall_num]; if (!lsc.name) { fprintf (trussinfo->outfile, "-- UNKNOWN SYSCALL %d\n", syscall_num); } if (nargs == 0) return; /* * Linux passes syscall arguments in registers, not * on the stack. Fortunately, we've got access to the * register set. Note that we don't bother checking the * number of arguments. And what does linux do for syscalls * that have more than five arguments? */ lsc.args[0] = regs.r_ebx; lsc.args[1] = regs.r_ecx; lsc.args[2] = regs.r_edx; lsc.args[3] = regs.r_esi; lsc.args[4] = regs.r_edi; sc = get_syscall(lsc.name); if (sc) { lsc.nargs = sc->nargs; } else { #ifdef DEBUG fprintf(trussinfo->outfile, "unknown syscall %s -- setting args to %d\n", lsc.name, nargs); #endif lsc.nargs = nargs; } lsc.s_args = malloc((1+lsc.nargs) * sizeof(char*)); memset(lsc.s_args, 0, lsc.nargs * sizeof(char*)); lsc.sc = sc; if (lsc.name) { #ifdef DEBUG fprintf(stderr, "syscall %s(", lsc.name); #endif for (i = 0; i < lsc.nargs ; i++) { #ifdef DEBUG fprintf(stderr, "0x%x%s", sc ? lsc.args[sc->args[i].offset] : lsc.args[i], i < (lsc.nargs - 1) ? "," : ""); #endif if (sc && !(sc->args[i].type & OUT)) { lsc.s_args[i] = print_arg(Procfd, &sc->args[i], lsc.args); } } #ifdef DEBUG fprintf(stderr, ")\n"); #endif } if (!strcmp(lsc.name, "linux_execve") || !strcmp(lsc.name, "exit")) { print_syscall(trussinfo, lsc.name, lsc.nargs, lsc.s_args); } return; } /* * Linux syscalls return negative errno's, we do positive and map them */ const int bsd_to_linux_errno[] = { -0, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -35, -12, -13, -14, -15, -16, -17, -18, -19, -20, -21, -22, -23, -24, -25, -26, -27, -28, -29, -30, -31, -32, -33, -34, -11,-115,-114, -88, -89, -90, -91, -92, -93, -94, -95, -96, -97, -98, -99, -100,-101,-102,-103,-104,-105,-106,-107,-108,-109, -110,-111, -40, -36,-112,-113, -39, -11, -87,-122, -116, -66, -6, -6, -6, -6, -6, -37, -38, -9, -6, }; int i386_linux_syscall_exit(struct trussinfo *trussinfo, int syscall_num __unused) { char *buf; struct reg regs; int retval; int i; int errorp; struct syscall *sc; if (fd == -1 || trussinfo->pid != cpid) { asprintf(&buf, "%s/%d/regs", procfs_path, trussinfo->pid); if (buf == NULL) err(1, "Out of memory"); fd = open(buf, O_RDONLY); free(buf); if (fd == -1) { fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n"); return 0; } cpid = trussinfo->pid; } lseek(fd, 0L, 0); if (read(fd, ®s, sizeof(regs)) != sizeof(regs)) { fprintf(trussinfo->outfile, "\n"); return 0; } retval = regs.r_eax; errorp = !!(regs.r_eflags & PSL_C); sc = lsc.sc; if (!sc) { for (i = 0; i < lsc.nargs; i++) { lsc.s_args[i] = malloc(12); sprintf(lsc.s_args[i], "0x%lx", lsc.args[i]); } } else { for (i = 0; i < sc->nargs; i++) { char *temp; if (sc->args[i].type & OUT) { if (errorp) { temp = malloc(12); sprintf(temp, "0x%lx", lsc.args[sc->args[i].offset]); } else { temp = print_arg(Procfd, &sc->args[i], lsc.args); } lsc.s_args[i] = temp; } } } if (errorp) { for (i = 0; i < (int)(sizeof(bsd_to_linux_errno) / sizeof(int)); i++) if (retval == bsd_to_linux_errno[i]) break; } print_syscall_ret(trussinfo, lsc.name, lsc.nargs, lsc.s_args, errorp, errorp ? i : retval); clear_lsc(); return (retval); }