[MIPS] N32: Fix N32 rt_sigtimedwait and rt_sigsuspend breakage.

Originally found through an oops in the Gentoo N32 userland build; patch
based on original patch by Daniel Jacobwitz.

Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

3 files changed, 35 insertions, 21 deletions

diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
index 60353f5acc4..9996b6e8458 100644
--- a/arch/mips/kernel/linux32.c
+++ b/arch/mips/kernel/linux32.c
@@ -1450,25 +1450,6 @@ sys32_timer_create(u32 clock, struct sigevent32 __user *se32, timer_t __user *ti
         return sys_timer_create(clock, p, timer_id);
 }
 
-asmlinkage long
-sysn32_rt_sigtimedwait(const sigset_t __user *uthese,
-                       siginfo_t __user *uinfo,
-                       const struct compat_timespec __user *uts32,
-                       size_t sigsetsize)
-{
-        struct timespec __user *uts = NULL;
-
-        if (uts32) {
-                struct timespec ts;
-                uts = compat_alloc_user_space(sizeof(struct timespec));
-                if (get_user(ts.tv_sec, &uts32->tv_sec) ||
-                    get_user(ts.tv_nsec, &uts32->tv_nsec) ||
-                    copy_to_user (uts, &ts, sizeof (ts)))
-                        return -EFAULT;
-        }
-        return sys_rt_sigtimedwait(uthese, uinfo, uts, sigsetsize);
-}
-
 save_static_function(sys32_clone);
 __attribute_used__ noinline static int
 _sys32_clone(nabi_no_regargs struct pt_regs regs)
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
index bc4980cefc8..d87b5446fa1 100644
--- a/arch/mips/kernel/scall64-n32.S
+++ b/arch/mips/kernel/scall64-n32.S
@@ -245,9 +245,9 @@ EXPORT(sysn32_call_table)
         PTR     sys_capget
         PTR     sys_capset
         PTR     sys32_rt_sigpending             /* 6125 */
-        PTR     sysn32_rt_sigtimedwait
+        PTR     compat_sys_rt_sigtimedwait
         PTR     sys_rt_sigqueueinfo
-        PTR     sys32_rt_sigsuspend
+        PTR     sysn32_rt_sigsuspend
         PTR     sys32_sigaltstack
         PTR     compat_sys_utime                /* 6130 */
         PTR     sys_mknod
diff --git a/arch/mips/kernel/signal_n32.c b/arch/mips/kernel/signal_n32.c
index 5a3776096f0..3e168c08a3a 100644
--- a/arch/mips/kernel/signal_n32.c
+++ b/arch/mips/kernel/signal_n32.c
@@ -81,6 +81,39 @@ struct rt_sigframe_n32 {
 #endif
 };
 
+extern void sigset_from_compat (sigset_t *set, compat_sigset_t *compat);
+
+save_static_function(sysn32_rt_sigsuspend);
+__attribute_used__ noinline static int
+_sysn32_rt_sigsuspend(nabi_no_regargs struct pt_regs regs)
+{
+        compat_sigset_t __user *unewset, uset;
+        size_t sigsetsize;
+        sigset_t newset;
+
+        /* XXX Don't preclude handling different sized sigset_t's.  */
+        sigsetsize = regs.regs[5];
+        if (sigsetsize != sizeof(sigset_t))
+                return -EINVAL;
+
+        unewset = (compat_sigset_t __user *) regs.regs[4];
+        if (copy_from_user(&uset, unewset, sizeof(uset)))
+                return -EFAULT;
+        sigset_from_compat (&newset, &uset);
+        sigdelsetmask(&newset, ~_BLOCKABLE);
+
+        spin_lock_irq(&current->sighand->siglock);
+        current->saved_sigmask = current->blocked;
+        current->blocked = newset;
+        recalc_sigpending();
+        spin_unlock_irq(&current->sighand->siglock);
+
+        current->state = TASK_INTERRUPTIBLE;
+        schedule();
+        set_thread_flag(TIF_RESTORE_SIGMASK);
+        return -ERESTARTNOHAND;
+}
+
 save_static_function(sysn32_rt_sigreturn);
 __attribute_used__ noinline static void
 _sysn32_rt_sigreturn(nabi_no_regargs struct pt_regs regs)