/usr.bin/truss/amd64-linux32.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 329 lines · 199 code · 41 blank · 89 comment · 51 complexity · 99d3b7d48324a1054dddfc2c78f6d23b MD5 · raw file
- /*
- * Copyright 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.
- */
- #ifndef lint
- static const char rcsid[] =
- "$FreeBSD$";
- #endif /* not lint */
- /*
- * 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 <sys/types.h>
- #include <sys/ptrace.h>
- #include <machine/reg.h>
- #include <machine/psl.h>
- #include <errno.h>
- #include <fcntl.h>
- #include <signal.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <time.h>
- #include <unistd.h>
- #include "truss.h"
- #include "syscall.h"
- #include "extern.h"
- #include "linux32_syscalls.h"
- static int nsyscalls =
- sizeof(linux32_syscallnames) / sizeof(linux32_syscallnames[0]);
- /*
- * This is what this particular file uses to keep track of a system call.
- * It is probably not quite sufficient -- I can probably use the same
- * structure for the various syscall personalities, and I also probably
- * need to nest system calls (for signal handlers).
- *
- * 'struct syscall' describes the system call; it may be NULL, however,
- * if we don't know about this particular system call yet.
- */
- 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 */
- };
- static struct linux_syscall *
- alloc_fsc(void)
- {
- return (malloc(sizeof(struct linux_syscall)));
- }
- /* Clear up and free parts of the fsc structure. */
- static void
- free_fsc(struct linux_syscall *fsc)
- {
- int i;
- if (fsc->s_args) {
- for (i = 0; i < fsc->nargs; i++)
- free(fsc->s_args[i]);
- free(fsc->s_args);
- }
- free(fsc);
- }
- /*
- * Called when a process has entered a system call. nargs is the
- * number of words, not number of arguments (a necessary distinction
- * in some cases). Note that if the STOPEVENT() code in i386/i386/trap.c
- * is ever changed these functions need to keep up.
- */
- void
- amd64_linux32_syscall_entry(struct trussinfo *trussinfo, int nargs)
- {
- struct reg regs;
- struct linux_syscall *fsc;
- struct syscall *sc;
- lwpid_t tid;
- int i, syscall_num;
- tid = trussinfo->curthread->tid;
- if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
- fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
- return;
- }
- syscall_num = regs.r_rax;
- fsc = alloc_fsc();
- if (fsc == NULL)
- return;
- fsc->number = syscall_num;
- fsc->name = (syscall_num < 0 || syscall_num >= nsyscalls) ?
- NULL : linux32_syscallnames[syscall_num];
- if (!fsc->name) {
- fprintf(trussinfo->outfile, "-- UNKNOWN SYSCALL %d --\n",
- syscall_num);
- }
- if (fsc->name && (trussinfo->flags & FOLLOWFORKS) &&
- (strcmp(fsc->name, "linux_fork") == 0 ||
- strcmp(fsc->name, "linux_vfork") == 0))
- trussinfo->curthread->in_fork = 1;
- 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?
- */
- fsc->args[0] = regs.r_rbx;
- fsc->args[1] = regs.r_rcx;
- fsc->args[2] = regs.r_rdx;
- fsc->args[3] = regs.r_rsi;
- fsc->args[4] = regs.r_rdi;
- sc = get_syscall(fsc->name);
- if (sc)
- fsc->nargs = sc->nargs;
- else {
- #if DEBUG
- fprintf(trussinfo->outfile, "unknown syscall %s -- setting "
- "args to %d\n", fsc->name, nargs);
- #endif
- fsc->nargs = nargs;
- }
- fsc->s_args = calloc(1, (1 + fsc->nargs) * sizeof(char *));
- fsc->sc = sc;
- /*
- * At this point, we set up the system call arguments.
- * We ignore any OUT ones, however -- those are arguments that
- * are set by the system call, and so are probably meaningless
- * now. This doesn't currently support arguments that are
- * passed in *and* out, however.
- */
- if (fsc->name) {
- #if DEBUG
- fprintf(stderr, "syscall %s(", fsc->name);
- #endif
- for (i = 0; i < fsc->nargs; i++) {
- #if DEBUG
- fprintf(stderr, "0x%x%s", sc ?
- fsc->args[sc->args[i].offset] : fsc->args[i],
- i < (fsc->nargs - 1) ? "," : "");
- #endif
- if (sc && !(sc->args[i].type & OUT)) {
- fsc->s_args[i] = print_arg(&sc->args[i],
- fsc->args, 0, trussinfo);
- }
- }
- #if DEBUG
- fprintf(stderr, ")\n");
- #endif
- }
- #if DEBUG
- fprintf(trussinfo->outfile, "\n");
- #endif
- if (fsc->name != NULL && (strcmp(fsc->name, "linux_execve") == 0 ||
- strcmp(fsc->name, "exit") == 0)) {
- /*
- * XXX
- * This could be done in a more general
- * manner but it still wouldn't be very pretty.
- */
- if (strcmp(fsc->name, "linux_execve") == 0) {
- if ((trussinfo->flags & EXECVEARGS) == 0) {
- if (fsc->s_args[1]) {
- free(fsc->s_args[1]);
- fsc->s_args[1] = NULL;
- }
- }
- if ((trussinfo->flags & EXECVEENVS) == 0) {
- if (fsc->s_args[2]) {
- free(fsc->s_args[2]);
- fsc->s_args[2] = NULL;
- }
- }
- }
- }
- trussinfo->curthread->fsc = fsc;
- }
- /*
- * Linux syscalls return negative errno's, we do positive and map them
- */
- static 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,
- };
- long
- amd64_linux32_syscall_exit(struct trussinfo *trussinfo,
- int syscall_num __unused)
- {
- struct reg regs;
- struct linux_syscall *fsc;
- struct syscall *sc;
- lwpid_t tid;
- long retval;
- int errorp, i;
- if (trussinfo->curthread->fsc == NULL)
- return (-1);
- tid = trussinfo->curthread->tid;
- if (ptrace(PT_GETREGS, tid, (caddr_t)®s, 0) < 0) {
- fprintf(trussinfo->outfile, "-- CANNOT READ REGISTERS --\n");
- return (-1);
- }
- retval = regs.r_rax;
- errorp = !!(regs.r_rflags & PSL_C);
- /*
- * This code, while simpler than the initial versions I used, could
- * stand some significant cleaning.
- */
- fsc = trussinfo->curthread->fsc;
- sc = fsc->sc;
- if (!sc) {
- for (i = 0; i < fsc->nargs; i++)
- asprintf(&fsc->s_args[i], "0x%lx", fsc->args[i]);
- } else {
- /*
- * Here, we only look for arguments that have OUT masked in --
- * otherwise, they were handled in the syscall_entry function.
- */
- for (i = 0; i < sc->nargs; i++) {
- char *temp;
- if (sc->args[i].type & OUT) {
- /*
- * If an error occurred, then don't bother
- * getting the data; it may not be valid.
- */
- if (errorp) {
- asprintf(&temp, "0x%lx",
- fsc->args[sc->args[i].offset]);
- } else {
- temp = print_arg(&sc->args[i],
- fsc->args, retval, trussinfo);
- }
- fsc->s_args[i] = temp;
- }
- }
- }
- /*
- * It would probably be a good idea to merge the error handling,
- * but that complicates things considerably.
- */
- if (errorp) {
- for (i = 0;
- (size_t)i < sizeof(bsd_to_linux_errno) / sizeof(int); i++) {
- if (retval == bsd_to_linux_errno[i])
- break;
- }
- }
- if (fsc->name != NULL && (strcmp(fsc->name, "linux_execve") == 0 ||
- strcmp(fsc->name, "exit") == 0))
- trussinfo->curthread->in_syscall = 1;
- print_syscall_ret(trussinfo, fsc->name, fsc->nargs, fsc->s_args, errorp,
- errorp ? i : retval, fsc->sc);
- free_fsc(fsc);
- return (retval);
- }