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Diffstat (limited to 'arch/powerpc/kernel/signal.c')
-rw-r--r--arch/powerpc/kernel/signal.c107
1 files changed, 105 insertions, 2 deletions
diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
index f92856b98b7..640b5f3611e 100644
--- a/arch/powerpc/kernel/signal.c
+++ b/arch/powerpc/kernel/signal.c
@@ -9,6 +9,7 @@
* this archive for more details.
*/
+#include <linux/freezer.h>
#include <linux/ptrace.h>
#include <linux/signal.h>
#include <asm/unistd.h>
@@ -16,6 +17,19 @@
#include "signal.h"
+#ifdef CONFIG_PPC64
+static inline int is_32bit_task(void)
+{
+ return test_thread_flag(TIF_32BIT);
+}
+#else
+static inline int is_32bit_task(void)
+{
+ return 1;
+}
+#endif
+
+
/*
* Restore the user process's signal mask
*/
@@ -28,8 +42,8 @@ void restore_sigmask(sigset_t *set)
spin_unlock_irq(&current->sighand->siglock);
}
-void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka,
- int has_handler)
+static void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka,
+ int has_handler)
{
unsigned long ret = regs->gpr[3];
int restart = 1;
@@ -79,6 +93,95 @@ void check_syscall_restart(struct pt_regs *regs, struct k_sigaction *ka,
}
}
+int do_signal(sigset_t *oldset, struct pt_regs *regs)
+{
+ siginfo_t info;
+ int signr;
+ struct k_sigaction ka;
+ int ret;
+ int is32 = is_32bit_task();
+
+#ifdef CONFIG_PPC32
+ if (try_to_freeze()) {
+ signr = 0;
+ if (!signal_pending(current))
+ goto no_signal;
+ }
+#endif
+
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ oldset = &current->saved_sigmask;
+ else if (!oldset)
+ oldset = &current->blocked;
+
+ signr = get_signal_to_deliver(&info, &ka, regs, NULL);
+
+#ifdef CONFIG_PPC32
+no_signal:
+#endif
+ /* Is there any syscall restart business here ? */
+ check_syscall_restart(regs, &ka, signr > 0);
+
+ if (signr <= 0) {
+ /* No signal to deliver -- put the saved sigmask back */
+ if (test_thread_flag(TIF_RESTORE_SIGMASK)) {
+ clear_thread_flag(TIF_RESTORE_SIGMASK);
+ sigprocmask(SIG_SETMASK, &current->saved_sigmask, NULL);
+ }
+ return 0; /* no signals delivered */
+ }
+
+#ifdef CONFIG_PPC64
+ /*
+ * Reenable the DABR before delivering the signal to
+ * user space. The DABR will have been cleared if it
+ * triggered inside the kernel.
+ */
+ if (current->thread.dabr)
+ set_dabr(current->thread.dabr);
+#endif
+
+ if (is32) {
+ unsigned int newsp;
+
+ if ((ka.sa.sa_flags & SA_ONSTACK) &&
+ current->sas_ss_size && !on_sig_stack(regs->gpr[1]))
+ newsp = current->sas_ss_sp + current->sas_ss_size;
+ else
+ newsp = regs->gpr[1];
+
+ if (ka.sa.sa_flags & SA_SIGINFO)
+ ret = handle_rt_signal32(signr, &ka, &info, oldset,
+ regs, newsp);
+ else
+ ret = handle_signal32(signr, &ka, &info, oldset,
+ regs, newsp);
+#ifdef CONFIG_PPC64
+ } else {
+ ret = handle_rt_signal64(signr, &ka, &info, oldset, regs);
+#endif
+ }
+
+ if (ret) {
+ spin_lock_irq(&current->sighand->siglock);
+ sigorsets(&current->blocked, &current->blocked,
+ &ka.sa.sa_mask);
+ if (!(ka.sa.sa_flags & SA_NODEFER))
+ sigaddset(&current->blocked, signr);
+ recalc_sigpending();
+ spin_unlock_irq(&current->sighand->siglock);
+
+ /*
+ * A signal was successfully delivered; the saved sigmask is in
+ * its frame, and we can clear the TIF_RESTORE_SIGMASK flag.
+ */
+ if (test_thread_flag(TIF_RESTORE_SIGMASK))
+ clear_thread_flag(TIF_RESTORE_SIGMASK);
+ }
+
+ return ret;
+}
+
long sys_sigaltstack(const stack_t __user *uss, stack_t __user *uoss,
unsigned long r5, unsigned long r6, unsigned long r7,
unsigned long r8, struct pt_regs *regs)