linux-user/sparc: Handle tag overflow traps

This trap is raised by taddcctv and tsubcctv insns.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20230216054516.1267305-16-richard.henderson@linaro.org>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>

linux-user/sparc/cpu_loop.c

@@ -328,6 +328,9 @@ void cpu_loop (CPUSPARCState *env)
         case TT_PRIV_INSN:
             force_sig_fault(TARGET_SIGILL, TARGET_ILL_PRVOPC, env->pc);
             break;
+        case TT_TOVF:
+            force_sig_fault(TARGET_SIGEMT, TARGET_EMT_TAGOVF, env->pc);
+            break;
 #ifdef TARGET_SPARC64
         case TT_PRIV_ACT:
             /* Note do_privact defers to do_privop. */

linux-user/sparc/target_signal.h

@@ -8,7 +8,7 @@
 #define TARGET_SIGTRAP           5
 #define TARGET_SIGABRT           6
 #define TARGET_SIGIOT            6
-#define TARGET_SIGSTKFLT         7 /* actually EMT */
+#define TARGET_SIGEMT            7
 #define TARGET_SIGFPE            8
 #define TARGET_SIGKILL           9
 #define TARGET_SIGBUS           10

linux-user/syscall_defs.h

@@ -717,6 +717,11 @@ typedef struct target_siginfo {
 #define TARGET_TRAP_HWBKPT      (4)     /* hardware breakpoint/watchpoint */
 #define TARGET_TRAP_UNK         (5)     /* undiagnosed trap */
 
+/*
+ * SIGEMT si_codes
+ */
+#define TARGET_EMT_TAGOVF      1       /* tag overflow */
+
 #include "target_resource.h"
 
 struct target_pollfd {