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;
}
stub_segv_handler(int sig)
{
struct sigcontext *sc = (struct sigcontext *) (&sig + 1);
int pid;
GET_FAULTINFO_FROM_SC(*((struct faultinfo *) UML_CONFIG_STUB_DATA),
sc);
pid = stub_syscall0(__NR_getpid);
stub_syscall2(__NR_kill, pid, SIGUSR1);
/* Load pointer to sigcontext into esp, since we need to leave
* the stack in its original form when we do the sigreturn here, by
* hand.
*/
__asm__ __volatile__("mov %0,%%esp ; movl %1, %%eax ; "
"int $0x80" : : "a" (sc), "g" (__NR_sigreturn));
}
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;
}