diff options
| -rw-r--r-- | arch/um/os-Linux/signal.c | 63 |
1 files changed, 18 insertions, 45 deletions
diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c index cde9e766b5b4..91a35da5fe90 100644 --- a/arch/um/os-Linux/signal.c +++ b/arch/um/os-Linux/signal.c @@ -10,14 +10,15 @@ #include <signal.h> #include <strings.h> #include "as-layout.h" -#include "kern_constants.h" #include "kern_util.h" #include "os.h" #include "sysdep/barrier.h" #include "sysdep/sigcontext.h" -#include "task.h" #include "user.h" +/* Copied from linux/compiler-gcc.h since we can't include it directly */ +#define barrier() __asm__ __volatile__("": : :"memory") + void (*sig_info[NSIG])(int, struct uml_pt_regs *) = { [SIGTRAP] = relay_signal, [SIGFPE] = relay_signal, @@ -28,58 +29,27 @@ void (*sig_info[NSIG])(int, struct uml_pt_regs *) = { [SIGIO] = sigio_handler, [SIGVTALRM] = timer_handler }; -static struct uml_pt_regs ksig_regs[UM_NR_CPUS]; - -void sig_handler_common_skas(int sig, void *sc_ptr) +static void sig_handler_common(int sig, struct sigcontext *sc) { - struct sigcontext *sc = sc_ptr; - struct uml_pt_regs *r; - void (*handler)(int, struct uml_pt_regs *); - int save_user, save_errno = errno; + struct uml_pt_regs r; + int 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 - */ + r.is_user = 0; 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]; + /* For segfaults, we want the data from the sigcontext. */ + copy_sc(&r, sc); + GET_FAULTINFO_FROM_SC(r.faultinfo, sc); + } - /* unblock SIGVTALRM, SIGIO if sig isn't IRQ signal */ + /* enable signals if sig isn't IRQ signal */ if ((sig != SIGIO) && (sig != SIGWINCH) && (sig != SIGVTALRM)) unblock_signals(); - handler(sig, r); + (*sig_info[sig])(sig, &r); errno = save_errno; - r->is_user = save_user; } -/* Copied from linux/compiler-gcc.h since we can't include it directly */ -#define barrier() __asm__ __volatile__("": : :"memory") - /* * These are the asynchronous signals. SIGPROF is excluded because we want to * be able to profile all of UML, not just the non-critical sections. If @@ -107,7 +77,7 @@ void sig_handler(int sig, struct sigcontext *sc) block_signals(); - sig_handler_common_skas(sig, sc); + sig_handler_common(sig, sc); set_signals(enabled); } @@ -227,6 +197,9 @@ void set_handler(int sig, void (*handler)(int), int flags, ...) sigaddset(&action.sa_mask, mask); va_end(ap); + if (sig == SIGSEGV) + flags |= SA_NODEFER; + action.sa_flags = flags; action.sa_restorer = NULL; if (sigaction(sig, &action, NULL) < 0) @@ -306,7 +279,7 @@ void unblock_signals(void) * back here. */ if (save_pending & SIGIO_MASK) - sig_handler_common_skas(SIGIO, NULL); + sig_handler_common(SIGIO, NULL); if (save_pending & SIGVTALRM_MASK) real_alarm_handler(NULL); |