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-rw-r--r--arch/um/os-Linux/signal.c63
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);