sparc: switch to use of generic old sigaction

note that due to historical accident we do *not* directly take
generic versions - need to check and invert the sign of signal
number first.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/sparc/Kconfig

@@ -53,6 +53,7 @@ config SPARC32
 	select GENERIC_ATOMIC64
 	select CLZ_TAB
 	select HAVE_UID16
+	select OLD_SIGACTION
 
 config SPARC64
 	def_bool 64BIT
@@ -549,6 +550,7 @@ config COMPAT
 	select COMPAT_BINFMT_ELF
 	select HAVE_UID16
 	select ARCH_WANT_OLD_COMPAT_IPC
+	select COMPAT_OLD_SIGACTION
 
 config SYSVIPC_COMPAT
 	bool

arch/sparc/include/uapi/asm/signal.h

@@ -160,7 +160,6 @@ struct __new_sigaction {
 	__sigrestore_t		sa_restorer;  /* not used by Linux/SPARC yet */
 	__new_sigset_t		sa_mask;
 };
-#endif
 
 struct __old_sigaction {
 	__sighandler_t		sa_handler;
@@ -168,6 +167,7 @@ struct __old_sigaction {
 	unsigned long		sa_flags;
 	void			(*sa_restorer)(void);  /* not used by Linux/SPARC yet */
 };
+#endif
 
 typedef struct sigaltstack {
 	void			__user *ss_sp;

arch/sparc/kernel/sys32.S

@@ -60,7 +60,7 @@ SIGN1(sys32_setitimer, compat_sys_setitimer, %o0)
 SIGN1(sys32_getitimer, compat_sys_getitimer, %o0)
 SIGN1(sys32_sethostname, sys_sethostname, %o1)
 SIGN1(sys32_swapon, sys_swapon, %o1)
-SIGN1(sys32_sigaction, compat_sys_sigaction, %o0)
+SIGN1(sys32_sigaction, compat_sys_sparc_sigaction, %o0)
 SIGN1(sys32_rt_sigaction, compat_sys_rt_sigaction, %o0)
 SIGN1(sys32_sigprocmask, compat_sys_sigprocmask, %o0)
 SIGN1(sys32_rt_sigprocmask, compat_sys_rt_sigprocmask, %o0)

arch/sparc/kernel/sys_sparc32.c

@@ -211,41 +211,12 @@ asmlinkage long compat_sys_sysfs(int option, u32 arg1, u32 arg2)
 	return sys_sysfs(option, arg1, arg2);
 }
 
-asmlinkage long compat_sys_sigaction(int sig, struct old_sigaction32 __user *act,
-				     struct old_sigaction32 __user *oact)
+COMPAT_SYSCALL_DEFINE3(sparc_sigaction, int, sig,
+			struct compat_old_sigaction __user *,act,
+			struct compat_old_sigaction __user *,oact)
 {
-        struct k_sigaction new_ka, old_ka;
-        int ret;
-
 	WARN_ON_ONCE(sig >= 0);
-	sig = -sig;
-
-        if (act) {
-		compat_old_sigset_t mask;
-		u32 u_handler, u_restorer;
-		
-		ret = get_user(u_handler, &act->sa_handler);
-		new_ka.sa.sa_handler =  compat_ptr(u_handler);
-		ret |= __get_user(u_restorer, &act->sa_restorer);
-		new_ka.sa.sa_restorer = compat_ptr(u_restorer);
-		ret |= __get_user(new_ka.sa.sa_flags, &act->sa_flags);
-		ret |= __get_user(mask, &act->sa_mask);
-		if (ret)
-			return ret;
-		new_ka.ka_restorer = NULL;
-		siginitset(&new_ka.sa.sa_mask, mask);
-        }
-
-        ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
-	if (!ret && oact) {
-		ret = put_user(ptr_to_compat(old_ka.sa.sa_handler), &oact->sa_handler);
-		ret |= __put_user(ptr_to_compat(old_ka.sa.sa_restorer), &oact->sa_restorer);
-		ret |= __put_user(old_ka.sa.sa_flags, &oact->sa_flags);
-		ret |= __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask);
-        }
-
-	return ret;
+	return compat_sys_sigaction(-sig, act, oact);
 }
 
 COMPAT_SYSCALL_DEFINE5(rt_sigaction, int, sig,

arch/sparc/kernel/sys_sparc_32.c

@@ -160,41 +160,12 @@ sparc_breakpoint (struct pt_regs *regs)
 #endif
 }
 
-asmlinkage int
-sparc_sigaction (int sig, const struct old_sigaction __user *act,
-		 struct old_sigaction __user *oact)
+SYSCALL_DEFINE3(sparc_sigaction, int, sig,
+		struct old_sigaction __user *,act,
+		struct old_sigaction __user *,oact)
 {
-	struct k_sigaction new_ka, old_ka;
-	int ret;
-
 	WARN_ON_ONCE(sig >= 0);
-	sig = -sig;
-
-	if (act) {
-		unsigned long mask;
-
-		if (!access_ok(VERIFY_READ, act, sizeof(*act)) ||
-		    __get_user(new_ka.sa.sa_handler, &act->sa_handler) ||
-		    __get_user(new_ka.sa.sa_restorer, &act->sa_restorer) ||
-		    __get_user(new_ka.sa.sa_flags, &act->sa_flags) ||
-		    __get_user(mask, &act->sa_mask))
-			return -EFAULT;
-		siginitset(&new_ka.sa.sa_mask, mask);
-		new_ka.ka_restorer = NULL;
-	}
-
-	ret = do_sigaction(sig, act ? &new_ka : NULL, oact ? &old_ka : NULL);
-
-	if (!ret && oact) {
-		if (!access_ok(VERIFY_WRITE, oact, sizeof(*oact)) ||
-		    __put_user(old_ka.sa.sa_handler, &oact->sa_handler) ||
-		    __put_user(old_ka.sa.sa_restorer, &oact->sa_restorer) ||
-		    __put_user(old_ka.sa.sa_flags, &oact->sa_flags) ||
-		    __put_user(old_ka.sa.sa_mask.sig[0], &oact->sa_mask))
-			return -EFAULT;
-	}
-
-	return ret;
+	return sys_sigaction(-sig, act, oact);
 }
 
 SYSCALL_DEFINE5(rt_sigaction, int, sig,

arch/sparc/kernel/systbls_32.S

@@ -55,7 +55,7 @@ sys_call_table:
 /*180*/	.long sys_flistxattr, sys_removexattr, sys_lremovexattr, sys_sigpending, sys_ni_syscall
 /*185*/	.long sys_setpgid, sys_fremovexattr, sys_tkill, sys_exit_group, sys_newuname
 /*190*/	.long sys_init_module, sys_personality, sparc_remap_file_pages, sys_epoll_create, sys_epoll_ctl
-/*195*/	.long sys_epoll_wait, sys_ioprio_set, sys_getppid, sparc_sigaction, sys_sgetmask
+/*195*/	.long sys_epoll_wait, sys_ioprio_set, sys_getppid, sys_sparc_sigaction, sys_sgetmask
 /*200*/	.long sys_ssetmask, sys_sigsuspend, sys_newlstat, sys_uselib, sys_old_readdir
 /*205*/	.long sys_readahead, sys_socketcall, sys_syslog, sys_lookup_dcookie, sys_fadvise64
 /*210*/	.long sys_fadvise64_64, sys_tgkill, sys_waitpid, sys_swapoff, sys_sysinfo