1 files changed, 62 insertions, 0 deletions

diff --git a/arch/um/os-Linux/signal.c b/arch/um/os-Linux/signal.c
index 62a66f38a913..cde9e766b5b4 100644
--- a/arch/um/os-Linux/signal.c
+++ b/arch/um/os-Linux/signal.c
@@ -9,12 +9,74 @@
 #include <errno.h>
 #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"
 
+void (*sig_info[NSIG])(int, struct uml_pt_regs *) = {
+        [SIGTRAP]       = relay_signal,
+        [SIGFPE]        = relay_signal,
+        [SIGILL]        = relay_signal,
+        [SIGWINCH]      = winch,
+        [SIGBUS]        = bus_handler,
+        [SIGSEGV]       = segv_handler,
+        [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)
+{
+        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;
+}
+
 /* Copied from linux/compiler-gcc.h since we can't include it directly */
 #define barrier() __asm__ __volatile__("": : :"memory")