linux-user: define TARGET_ARCH_HAS_KA_RESTORER

Sparc as an extended sigaction structure containing
the field ka_restorer used in place of sa_restorer.

Define TARGET_ARCH_HAS_KA_RESTORER and use it
with sparc.
Signed-off-by: NLaurent Vivier <laurent@vivier.eu>
Message-Id: <20180402102453.9883-2-laurent@vivier.eu>

linux-user/signal.c

@@ -2920,8 +2920,8 @@ static void setup_frame(int sig, struct target_sigaction *ka,
     env->pc = ka->_sa_handler;
     env->npc = (env->pc + 4);
     /* 5. return to kernel instructions */
-    if (ka->sa_restorer) {
-        env->regwptr[UREG_I7] = ka->sa_restorer;
+    if (ka->ka_restorer) {
+        env->regwptr[UREG_I7] = ka->ka_restorer;
     } else {
         uint32_t val32;
 

linux-user/syscall.c

@@ -8699,6 +8699,9 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
                 target_siginitset(&act.sa_mask, old_act->sa_mask);
                 act.sa_flags = old_act->sa_flags;
                 act.sa_restorer = old_act->sa_restorer;
+#ifdef TARGET_ARCH_HAS_KA_RESTORER
+                act.ka_restorer = 0;
+#endif
                 unlock_user_struct(old_act, arg2, 0);
                 pact = &act;
             } else {
@@ -8773,8 +8776,8 @@ abi_long do_syscall(void *cpu_env, int num, abi_long arg1,
                 if (!lock_user_struct(VERIFY_READ, act, arg2, 1)) {
                     goto efault;
                 }
-#ifdef TARGET_SPARC
-                act->sa_restorer = restorer;
+#ifdef TARGET_ARCH_HAS_KA_RESTORER
+                act->ka_restorer = restorer;
 #endif
             } else {
                 act = NULL;

linux-user/syscall_defs.h

@@ -435,6 +435,7 @@ int do_sigaction(int sig, const struct target_sigaction *act,
 #define TARGET_SA_NODEFER      0x20u
 #define TARGET_SA_RESETHAND    4u
 #define TARGET_ARCH_HAS_SA_RESTORER 1
+#define TARGET_ARCH_HAS_KA_RESTORER 1
 #elif defined(TARGET_MIPS)
 #define TARGET_SA_NOCLDSTOP	0x00000001
 #define TARGET_SA_NOCLDWAIT	0x00010000
@@ -742,6 +743,9 @@ struct target_sigaction {
         abi_ulong sa_restorer;
 #endif
         target_sigset_t sa_mask;
+#ifdef TARGET_ARCH_HAS_KA_RESTORER
+        abi_ulong ka_restorer;
+#endif
 };
 #endif