linux-user: move sparc/sparc64 signal.c parts to sparc directory

No code change, only move code from signal.c to
sparc/signal.c, except adding includes and
exporting setup_frame() and setup_rt_frame().

sparc64/signal.c includes sparc/signal.c

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180424192635.6027-18-laurent@vivier.eu>

linux-user/sparc/target_signal.h

@@ -33,5 +33,9 @@ static inline abi_ulong get_sp_from_cpustate(CPUSPARCState *state)
     return state->regwptr[UREG_FP];
 }
 
-
+void setup_frame(int sig, struct target_sigaction *ka,
+                 target_sigset_t *set, CPUSPARCState *env);
+void setup_rt_frame(int sig, struct target_sigaction *ka,
+                    target_siginfo_t *info,
+                    target_sigset_t *set, CPUSPARCState *env);
 #endif /* SPARC_TARGET_SIGNAL_H */

linux-user/sparc64/signal.c

@@ -16,3 +16,5 @@
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  */
+#define SPARC_TARGET_SIGNAL_H /* to only include sparc64/target_signal.h */
+#include "../sparc/signal.c"

linux-user/sparc64/target_signal.h

@@ -33,5 +33,9 @@ static inline abi_ulong get_sp_from_cpustate(CPUSPARCState *state)
     return state->regwptr[UREG_FP];
 }
 
-
+void setup_frame(int sig, struct target_sigaction *ka,
+                 target_sigset_t *set, CPUSPARCState *env);
+void setup_rt_frame(int sig, struct target_sigaction *ka,
+                    target_siginfo_t *info,
+                    target_sigset_t *set, CPUSPARCState *env);
 #endif /* SPARC64_TARGET_SIGNAL_H */