Exemple #1
0
static void real_alarm_handler(struct sigcontext *sc)
{
	struct uml_pt_regs regs;

	if (sc != NULL)
		copy_sc(&regs, sc);
	regs.is_user = 0;
	unblock_signals();
	timer_handler(SIGVTALRM, &regs);
}
Exemple #2
0
void sig_handler_common_skas(int sig, void *sc_ptr)
{
	struct sigcontext *sc = sc_ptr;
	struct uml_pt_regs *r;
	void (*handler)(int, struct uml_pt_regs *);
	int save_user, save_errno = errno;

	/*
	 * This is done because to allow SIGSEGV to be delivered inside a SEGV
	 * handler.  This can happen in copy_user, and if SEGV is disabled,
	 * the process will die.
	 * XXX Figure out why this is better than SA_NODEFER
	 */
	if (sig == SIGSEGV) {
		change_sig(SIGSEGV, 1);
		/*
		 * For segfaults, we want the data from the
		 * sigcontext.  In this case, we don't want to mangle
		 * the process registers, so use a static set of
		 * registers.  For other signals, the process
		 * registers are OK.
		 */
		r = &ksig_regs[cpu()];
		copy_sc(r, sc_ptr);
	}
	else r = TASK_REGS(get_current());

	save_user = r->is_user;
	r->is_user = 0;
	if ((sig == SIGFPE) || (sig == SIGSEGV) || (sig == SIGBUS) ||
	    (sig == SIGILL) || (sig == SIGTRAP))
		GET_FAULTINFO_FROM_SC(r->faultinfo, sc);

	change_sig(SIGUSR1, 1);

	handler = sig_info[sig];

	/* unblock SIGVTALRM, SIGIO if sig isn't IRQ signal */
	if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGVTALRM))
		unblock_signals();

	handler(sig, r);

	errno = save_errno;
	r->is_user = save_user;
}
Exemple #3
0
static void sig_handler_common(int sig, struct sigcontext *sc)
{
	struct uml_pt_regs r;
	int save_errno = errno;

	r.is_user = 0;
	if (sig == SIGSEGV) {
		/* For segfaults, we want the data from the sigcontext. */
		copy_sc(&r, sc);
		GET_FAULTINFO_FROM_SC(r.faultinfo, sc);
	}

	/* enable signals if sig isn't IRQ signal */
	if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGVTALRM))
		unblock_signals();

	(*sig_info[sig])(sig, &r);

	errno = save_errno;
}
Exemple #4
0
static int copy_sc_from_user_skas(struct pt_regs *regs,
				  struct sigcontext __user *from)
{
  	struct sigcontext sc;
	unsigned long fpregs[HOST_FP_SIZE];
	int err;

	err = copy_from_user(&sc, from, sizeof(sc));
	err |= copy_from_user(fpregs, sc.fpstate, sizeof(fpregs));
	if(err)
		return err;

	copy_sc(&regs->regs, &sc);

	err = restore_fp_registers(userspace_pid[0], fpregs);
	if(err < 0) {
	  	printk("copy_sc_from_user_skas - PTRACE_SETFPREGS failed, "
		       "errno = %d\n", -err);
		return err;
	}

	return 0;
}